#endif
#endif
+typedef short PyInt16;
+
#if defined(__CHAR_UNSIGNED__)
#if defined(signed)
/* This module currently does not work on systems where only unsigned
*/
#define BIAS 0x84 /* define the add-in bias for 16 bit samples */
#define CLIP 32635
-#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
-#define QUANT_MASK (0xf) /* Quantization field mask. */
-#define SEG_SHIFT (4) /* Left shift for segment number. */
-#define SEG_MASK (0x70) /* Segment field mask. */
+#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
+#define QUANT_MASK (0xf) /* Quantization field mask. */
+#define SEG_SHIFT (4) /* Left shift for segment number. */
+#define SEG_MASK (0x70) /* Segment field mask. */
-static int16_t seg_aend[8] = {0x1F, 0x3F, 0x7F, 0xFF,
- 0x1FF, 0x3FF, 0x7FF, 0xFFF};
-static int16_t seg_uend[8] = {0x3F, 0x7F, 0xFF, 0x1FF,
- 0x3FF, 0x7FF, 0xFFF, 0x1FFF};
+static PyInt16 seg_aend[8] = {0x1F, 0x3F, 0x7F, 0xFF,
+ 0x1FF, 0x3FF, 0x7FF, 0xFFF};
+static PyInt16 seg_uend[8] = {0x3F, 0x7F, 0xFF, 0x1FF,
+ 0x3FF, 0x7FF, 0xFFF, 0x1FFF};
-static int16_t search(int16_t val, int16_t *table, int size)
+static PyInt16 search(PyInt16 val, PyInt16 *table, int size)
{
- int i;
+ int i;
- for (i = 0; i < size; i++) {
- if (val <= *table++)
- return (i);
- }
- return (size);
+ for (i = 0; i < size; i++) {
+ if (val <= *table++)
+ return (i);
+ }
+ return (size);
}
#define st_ulaw2linear16(uc) (_st_ulaw2linear16[uc])
#define st_alaw2linear16(uc) (_st_alaw2linear16[uc])
-int16_t _st_ulaw2linear16[256] = {
+PyInt16 _st_ulaw2linear16[256] = {
-32124, -31100, -30076, -29052, -28028, -27004, -25980,
-24956, -23932, -22908, -21884, -20860, -19836, -18812,
-17788, -16764, -15996, -15484, -14972, -14460, -13948,
* is biased by adding 33 which shifts the encoding range from (0 - 8158) to
* (33 - 8191). The result can be seen in the following encoding table:
*
- * Biased Linear Input Code Compressed Code
- * ------------------------ ---------------
- * 00000001wxyza 000wxyz
- * 0000001wxyzab 001wxyz
- * 000001wxyzabc 010wxyz
- * 00001wxyzabcd 011wxyz
- * 0001wxyzabcde 100wxyz
- * 001wxyzabcdef 101wxyz
- * 01wxyzabcdefg 110wxyz
- * 1wxyzabcdefgh 111wxyz
+ * Biased Linear Input Code Compressed Code
+ * ------------------------ ---------------
+ * 00000001wxyza 000wxyz
+ * 0000001wxyzab 001wxyz
+ * 000001wxyzabc 010wxyz
+ * 00001wxyzabcd 011wxyz
+ * 0001wxyzabcde 100wxyz
+ * 001wxyzabcdef 101wxyz
+ * 01wxyzabcdefg 110wxyz
+ * 1wxyzabcdefgh 111wxyz
*
* Each biased linear code has a leading 1 which identifies the segment
* number. The value of the segment number is equal to 7 minus the number
* John Wiley & Sons, pps 98-111 and 472-476.
*/
unsigned char st_14linear2ulaw(
- int16_t pcm_val) /* 2's complement (14-bit range) */
+ PyInt16 pcm_val) /* 2's complement (14-bit range) */
{
- int16_t mask;
- int16_t seg;
- unsigned char uval;
-
- /* The original sox code does this in the calling function, not here */
- pcm_val = pcm_val >> 2;
-
- /* u-law inverts all bits */
- /* Get the sign and the magnitude of the value. */
- if (pcm_val < 0) {
- pcm_val = -pcm_val;
- mask = 0x7F;
- } else {
- mask = 0xFF;
- }
- if ( pcm_val > CLIP ) pcm_val = CLIP; /* clip the magnitude */
- pcm_val += (BIAS >> 2);
-
- /* Convert the scaled magnitude to segment number. */
- seg = search(pcm_val, seg_uend, 8);
-
- /*
- * Combine the sign, segment, quantization bits;
- * and complement the code word.
- */
- if (seg >= 8) /* out of range, return maximum value. */
- return (unsigned char) (0x7F ^ mask);
- else {
- uval = (unsigned char) (seg << 4) | ((pcm_val >> (seg + 1)) & 0xF);
- return (uval ^ mask);
- }
+ PyInt16 mask;
+ PyInt16 seg;
+ unsigned char uval;
+
+ /* The original sox code does this in the calling function, not here */
+ pcm_val = pcm_val >> 2;
+
+ /* u-law inverts all bits */
+ /* Get the sign and the magnitude of the value. */
+ if (pcm_val < 0) {
+ pcm_val = -pcm_val;
+ mask = 0x7F;
+ } else {
+ mask = 0xFF;
+ }
+ if ( pcm_val > CLIP ) pcm_val = CLIP; /* clip the magnitude */
+ pcm_val += (BIAS >> 2);
+
+ /* Convert the scaled magnitude to segment number. */
+ seg = search(pcm_val, seg_uend, 8);
+
+ /*
+ * Combine the sign, segment, quantization bits;
+ * and complement the code word.
+ */
+ if (seg >= 8) /* out of range, return maximum value. */
+ return (unsigned char) (0x7F ^ mask);
+ else {
+ uval = (unsigned char) (seg << 4) | ((pcm_val >> (seg + 1)) & 0xF);
+ return (uval ^ mask);
+ }
}
-int16_t _st_alaw2linear16[256] = {
+PyInt16 _st_alaw2linear16[256] = {
-5504, -5248, -6016, -5760, -4480, -4224, -4992,
-4736, -7552, -7296, -8064, -7808, -6528, -6272,
-7040, -6784, -2752, -2624, -3008, -2880, -2240,
* the data shifted such that it only contains information in the lower
* 13-bits.
*
- * Linear Input Code Compressed Code
- * ------------------------ ---------------
- * 0000000wxyza 000wxyz
- * 0000001wxyza 001wxyz
- * 000001wxyzab 010wxyz
- * 00001wxyzabc 011wxyz
- * 0001wxyzabcd 100wxyz
- * 001wxyzabcde 101wxyz
- * 01wxyzabcdef 110wxyz
- * 1wxyzabcdefg 111wxyz
+ * Linear Input Code Compressed Code
+ * ------------------------ ---------------
+ * 0000000wxyza 000wxyz
+ * 0000001wxyza 001wxyz
+ * 000001wxyzab 010wxyz
+ * 00001wxyzabc 011wxyz
+ * 0001wxyzabcd 100wxyz
+ * 001wxyzabcde 101wxyz
+ * 01wxyzabcdef 110wxyz
+ * 1wxyzabcdefg 111wxyz
*
* For further information see John C. Bellamy's Digital Telephony, 1982,
* John Wiley & Sons, pps 98-111 and 472-476.
*/
unsigned char st_linear2alaw(
- int16_t pcm_val) /* 2's complement (13-bit range) */
+ PyInt16 pcm_val) /* 2's complement (13-bit range) */
{
- int16_t mask;
- short seg;
- unsigned char aval;
-
- /* The original sox code does this in the calling function, not here */
- pcm_val = pcm_val >> 3;
-
- /* A-law using even bit inversion */
- if (pcm_val >= 0) {
- mask = 0xD5; /* sign (7th) bit = 1 */
- } else {
- mask = 0x55; /* sign bit = 0 */
- pcm_val = -pcm_val - 1;
- }
-
- /* Convert the scaled magnitude to segment number. */
- seg = search(pcm_val, seg_aend, 8);
-
- /* Combine the sign, segment, and quantization bits. */
-
- if (seg >= 8) /* out of range, return maximum value. */
- return (unsigned char) (0x7F ^ mask);
- else {
- aval = (unsigned char) seg << SEG_SHIFT;
- if (seg < 2)
- aval |= (pcm_val >> 1) & QUANT_MASK;
- else
- aval |= (pcm_val >> seg) & QUANT_MASK;
- return (aval ^ mask);
- }
+ PyInt16 mask;
+ short seg;
+ unsigned char aval;
+
+ /* The original sox code does this in the calling function, not here */
+ pcm_val = pcm_val >> 3;
+
+ /* A-law using even bit inversion */
+ if (pcm_val >= 0) {
+ mask = 0xD5; /* sign (7th) bit = 1 */
+ } else {
+ mask = 0x55; /* sign bit = 0 */
+ pcm_val = -pcm_val - 1;
+ }
+
+ /* Convert the scaled magnitude to segment number. */
+ seg = search(pcm_val, seg_aend, 8);
+
+ /* Combine the sign, segment, and quantization bits. */
+
+ if (seg >= 8) /* out of range, return maximum value. */
+ return (unsigned char) (0x7F ^ mask);
+ else {
+ aval = (unsigned char) seg << SEG_SHIFT;
+ if (seg < 2)
+ aval |= (pcm_val >> 1) & QUANT_MASK;
+ else
+ aval |= (pcm_val >> seg) & QUANT_MASK;
+ return (aval ^ mask);
+ }
}
/* End of code taken from sox */
/* Intel ADPCM step variation table */
static int indexTable[16] = {
- -1, -1, -1, -1, 2, 4, 6, 8,
- -1, -1, -1, -1, 2, 4, 6, 8,
+ -1, -1, -1, -1, 2, 4, 6, 8,
+ -1, -1, -1, -1, 2, 4, 6, 8,
};
static int stepsizeTable[89] = {
- 7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
- 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
- 50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
- 130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
- 337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
- 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
- 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
- 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
- 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
+ 7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
+ 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
+ 50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
+ 130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
+ 337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
+ 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
+ 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
+ 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
+ 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
};
#define CHARP(cp, i) ((signed char *)(cp+i))
static PyObject *
audioop_getsample(PyObject *self, PyObject *args)
{
- signed char *cp;
- int len, size, val = 0;
- int i;
-
- if ( !PyArg_Parse(args, "(s#ii)", &cp, &len, &size, &i) )
- return 0;
- if ( size != 1 && size != 2 && size != 4 ) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
- if ( i < 0 || i >= len/size ) {
- PyErr_SetString(AudioopError, "Index out of range");
- return 0;
- }
- if ( size == 1 ) val = (int)*CHARP(cp, i);
- else if ( size == 2 ) val = (int)*SHORTP(cp, i*2);
- else if ( size == 4 ) val = (int)*LONGP(cp, i*4);
- return PyInt_FromLong(val);
+ signed char *cp;
+ int len, size, val = 0;
+ int i;
+
+ if ( !PyArg_Parse(args, "(s#ii)", &cp, &len, &size, &i) )
+ return 0;
+ if ( size != 1 && size != 2 && size != 4 ) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
+ if ( i < 0 || i >= len/size ) {
+ PyErr_SetString(AudioopError, "Index out of range");
+ return 0;
+ }
+ if ( size == 1 ) val = (int)*CHARP(cp, i);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i*2);
+ else if ( size == 4 ) val = (int)*LONGP(cp, i*4);
+ return PyInt_FromLong(val);
}
static PyObject *
audioop_max(PyObject *self, PyObject *args)
{
- signed char *cp;
- int len, size, val = 0;
- int i;
- int max = 0;
-
- if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
- return 0;
- if ( size != 1 && size != 2 && size != 4 ) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
- for ( i=0; i<len; i+= size) {
- if ( size == 1 ) val = (int)*CHARP(cp, i);
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = (int)*LONGP(cp, i);
- if ( val < 0 ) val = (-val);
- if ( val > max ) max = val;
- }
- return PyInt_FromLong(max);
+ signed char *cp;
+ int len, size, val = 0;
+ int i;
+ int max = 0;
+
+ if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
+ return 0;
+ if ( size != 1 && size != 2 && size != 4 ) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
+ for ( i=0; i<len; i+= size) {
+ if ( size == 1 ) val = (int)*CHARP(cp, i);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = (int)*LONGP(cp, i);
+ if ( val < 0 ) val = (-val);
+ if ( val > max ) max = val;
+ }
+ return PyInt_FromLong(max);
}
static PyObject *
audioop_minmax(PyObject *self, PyObject *args)
{
- signed char *cp;
- int len, size, val = 0;
- int i;
- int min = 0x7fffffff, max = -0x7fffffff;
-
- if (!PyArg_Parse(args, "(s#i)", &cp, &len, &size))
- return NULL;
- if (size != 1 && size != 2 && size != 4) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return NULL;
- }
- for (i = 0; i < len; i += size) {
- if (size == 1) val = (int) *CHARP(cp, i);
- else if (size == 2) val = (int) *SHORTP(cp, i);
- else if (size == 4) val = (int) *LONGP(cp, i);
- if (val > max) max = val;
- if (val < min) min = val;
- }
- return Py_BuildValue("(ii)", min, max);
+ signed char *cp;
+ int len, size, val = 0;
+ int i;
+ int min = 0x7fffffff, max = -0x7fffffff;
+
+ if (!PyArg_Parse(args, "(s#i)", &cp, &len, &size))
+ return NULL;
+ if (size != 1 && size != 2 && size != 4) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return NULL;
+ }
+ for (i = 0; i < len; i += size) {
+ if (size == 1) val = (int) *CHARP(cp, i);
+ else if (size == 2) val = (int) *SHORTP(cp, i);
+ else if (size == 4) val = (int) *LONGP(cp, i);
+ if (val > max) max = val;
+ if (val < min) min = val;
+ }
+ return Py_BuildValue("(ii)", min, max);
}
static PyObject *
audioop_avg(PyObject *self, PyObject *args)
{
- signed char *cp;
- int len, size, val = 0;
- int i;
- double avg = 0.0;
-
- if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
- return 0;
- if ( size != 1 && size != 2 && size != 4 ) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
- for ( i=0; i<len; i+= size) {
- if ( size == 1 ) val = (int)*CHARP(cp, i);
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = (int)*LONGP(cp, i);
- avg += val;
- }
- if ( len == 0 )
- val = 0;
- else
- val = (int)(avg / (double)(len/size));
- return PyInt_FromLong(val);
+ signed char *cp;
+ int len, size, val = 0;
+ int i;
+ double avg = 0.0;
+
+ if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
+ return 0;
+ if ( size != 1 && size != 2 && size != 4 ) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
+ for ( i=0; i<len; i+= size) {
+ if ( size == 1 ) val = (int)*CHARP(cp, i);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = (int)*LONGP(cp, i);
+ avg += val;
+ }
+ if ( len == 0 )
+ val = 0;
+ else
+ val = (int)(avg / (double)(len/size));
+ return PyInt_FromLong(val);
}
static PyObject *
audioop_rms(PyObject *self, PyObject *args)
{
- signed char *cp;
- int len, size, val = 0;
- int i;
- double sum_squares = 0.0;
-
- if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
- return 0;
- if ( size != 1 && size != 2 && size != 4 ) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
- for ( i=0; i<len; i+= size) {
- if ( size == 1 ) val = (int)*CHARP(cp, i);
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = (int)*LONGP(cp, i);
- sum_squares += (double)val*(double)val;
- }
- if ( len == 0 )
- val = 0;
- else
- val = (int)sqrt(sum_squares / (double)(len/size));
- return PyInt_FromLong(val);
+ signed char *cp;
+ int len, size, val = 0;
+ int i;
+ double sum_squares = 0.0;
+
+ if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
+ return 0;
+ if ( size != 1 && size != 2 && size != 4 ) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
+ for ( i=0; i<len; i+= size) {
+ if ( size == 1 ) val = (int)*CHARP(cp, i);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = (int)*LONGP(cp, i);
+ sum_squares += (double)val*(double)val;
+ }
+ if ( len == 0 )
+ val = 0;
+ else
+ val = (int)sqrt(sum_squares / (double)(len/size));
+ return PyInt_FromLong(val);
}
static double _sum2(short *a, short *b, int len)
{
- int i;
- double sum = 0.0;
+ int i;
+ double sum = 0.0;
- for( i=0; i<len; i++) {
- sum = sum + (double)a[i]*(double)b[i];
- }
- return sum;
+ for( i=0; i<len; i++) {
+ sum = sum + (double)a[i]*(double)b[i];
+ }
+ return sum;
}
/*
** vj = ( sum(A[j+i]^2)*sum(R[i]^2) - sum(A[j+i]R[i])^2 ) / sum( A[j+i]^2 )
**
** In the code variables correspond as follows:
-** cp1 A
-** cp2 R
-** len1 N
-** len2 n
-** aj_m1 A[j-1]
-** aj_lm1 A[j+n-1]
-** sum_ri_2 sum(R[i]^2)
-** sum_aij_2 sum(A[i+j]^2)
-** sum_aij_ri sum(A[i+j]R[i])
+** cp1 A
+** cp2 R
+** len1 N
+** len2 n
+** aj_m1 A[j-1]
+** aj_lm1 A[j+n-1]
+** sum_ri_2 sum(R[i]^2)
+** sum_aij_2 sum(A[i+j]^2)
+** sum_aij_ri sum(A[i+j]R[i])
**
** sum_ri is calculated once, sum_aij_2 is updated each step and sum_aij_ri
** is completely recalculated each step.
static PyObject *
audioop_findfit(PyObject *self, PyObject *args)
{
- short *cp1, *cp2;
- int len1, len2;
- int j, best_j;
- double aj_m1, aj_lm1;
- double sum_ri_2, sum_aij_2, sum_aij_ri, result, best_result, factor;
-
- if ( !PyArg_Parse(args, "(s#s#)", &cp1, &len1, &cp2, &len2) )
- return 0;
- if ( len1 & 1 || len2 & 1 ) {
- PyErr_SetString(AudioopError, "Strings should be even-sized");
- return 0;
- }
- len1 >>= 1;
- len2 >>= 1;
+ short *cp1, *cp2;
+ int len1, len2;
+ int j, best_j;
+ double aj_m1, aj_lm1;
+ double sum_ri_2, sum_aij_2, sum_aij_ri, result, best_result, factor;
+
+ if ( !PyArg_Parse(args, "(s#s#)", &cp1, &len1, &cp2, &len2) )
+ return 0;
+ if ( len1 & 1 || len2 & 1 ) {
+ PyErr_SetString(AudioopError, "Strings should be even-sized");
+ return 0;
+ }
+ len1 >>= 1;
+ len2 >>= 1;
- if ( len1 < len2 ) {
- PyErr_SetString(AudioopError, "First sample should be longer");
- return 0;
- }
- sum_ri_2 = _sum2(cp2, cp2, len2);
- sum_aij_2 = _sum2(cp1, cp1, len2);
- sum_aij_ri = _sum2(cp1, cp2, len2);
-
- result = (sum_ri_2*sum_aij_2 - sum_aij_ri*sum_aij_ri) / sum_aij_2;
-
- best_result = result;
- best_j = 0;
- j = 0;
-
- for ( j=1; j<=len1-len2; j++) {
- aj_m1 = (double)cp1[j-1];
- aj_lm1 = (double)cp1[j+len2-1];
-
- sum_aij_2 = sum_aij_2 + aj_lm1*aj_lm1 - aj_m1*aj_m1;
- sum_aij_ri = _sum2(cp1+j, cp2, len2);
-
- result = (sum_ri_2*sum_aij_2 - sum_aij_ri*sum_aij_ri)
- / sum_aij_2;
-
- if ( result < best_result ) {
- best_result = result;
- best_j = j;
- }
-
- }
-
- factor = _sum2(cp1+best_j, cp2, len2) / sum_ri_2;
+ if ( len1 < len2 ) {
+ PyErr_SetString(AudioopError, "First sample should be longer");
+ return 0;
+ }
+ sum_ri_2 = _sum2(cp2, cp2, len2);
+ sum_aij_2 = _sum2(cp1, cp1, len2);
+ sum_aij_ri = _sum2(cp1, cp2, len2);
+
+ result = (sum_ri_2*sum_aij_2 - sum_aij_ri*sum_aij_ri) / sum_aij_2;
+
+ best_result = result;
+ best_j = 0;
+ j = 0;
+
+ for ( j=1; j<=len1-len2; j++) {
+ aj_m1 = (double)cp1[j-1];
+ aj_lm1 = (double)cp1[j+len2-1];
+
+ sum_aij_2 = sum_aij_2 + aj_lm1*aj_lm1 - aj_m1*aj_m1;
+ sum_aij_ri = _sum2(cp1+j, cp2, len2);
+
+ result = (sum_ri_2*sum_aij_2 - sum_aij_ri*sum_aij_ri)
+ / sum_aij_2;
+
+ if ( result < best_result ) {
+ best_result = result;
+ best_j = j;
+ }
+
+ }
+
+ factor = _sum2(cp1+best_j, cp2, len2) / sum_ri_2;
- return Py_BuildValue("(if)", best_j, factor);
+ return Py_BuildValue("(if)", best_j, factor);
}
/*
static PyObject *
audioop_findfactor(PyObject *self, PyObject *args)
{
- short *cp1, *cp2;
- int len1, len2;
- double sum_ri_2, sum_aij_ri, result;
-
- if ( !PyArg_Parse(args, "(s#s#)", &cp1, &len1, &cp2, &len2) )
- return 0;
- if ( len1 & 1 || len2 & 1 ) {
- PyErr_SetString(AudioopError, "Strings should be even-sized");
- return 0;
- }
- if ( len1 != len2 ) {
- PyErr_SetString(AudioopError, "Samples should be same size");
- return 0;
- }
- len2 >>= 1;
- sum_ri_2 = _sum2(cp2, cp2, len2);
- sum_aij_ri = _sum2(cp1, cp2, len2);
-
- result = sum_aij_ri / sum_ri_2;
-
- return PyFloat_FromDouble(result);
+ short *cp1, *cp2;
+ int len1, len2;
+ double sum_ri_2, sum_aij_ri, result;
+
+ if ( !PyArg_Parse(args, "(s#s#)", &cp1, &len1, &cp2, &len2) )
+ return 0;
+ if ( len1 & 1 || len2 & 1 ) {
+ PyErr_SetString(AudioopError, "Strings should be even-sized");
+ return 0;
+ }
+ if ( len1 != len2 ) {
+ PyErr_SetString(AudioopError, "Samples should be same size");
+ return 0;
+ }
+ len2 >>= 1;
+ sum_ri_2 = _sum2(cp2, cp2, len2);
+ sum_aij_ri = _sum2(cp1, cp2, len2);
+
+ result = sum_aij_ri / sum_ri_2;
+
+ return PyFloat_FromDouble(result);
}
/*
static PyObject *
audioop_findmax(PyObject *self, PyObject *args)
{
- short *cp1;
- int len1, len2;
- int j, best_j;
- double aj_m1, aj_lm1;
- double result, best_result;
-
- if ( !PyArg_Parse(args, "(s#i)", &cp1, &len1, &len2) )
- return 0;
- if ( len1 & 1 ) {
- PyErr_SetString(AudioopError, "Strings should be even-sized");
- return 0;
- }
- len1 >>= 1;
+ short *cp1;
+ int len1, len2;
+ int j, best_j;
+ double aj_m1, aj_lm1;
+ double result, best_result;
+
+ if ( !PyArg_Parse(args, "(s#i)", &cp1, &len1, &len2) )
+ return 0;
+ if ( len1 & 1 ) {
+ PyErr_SetString(AudioopError, "Strings should be even-sized");
+ return 0;
+ }
+ len1 >>= 1;
- if ( len1 < len2 ) {
- PyErr_SetString(AudioopError, "Input sample should be longer");
- return 0;
- }
+ if ( len1 < len2 ) {
+ PyErr_SetString(AudioopError, "Input sample should be longer");
+ return 0;
+ }
- result = _sum2(cp1, cp1, len2);
+ result = _sum2(cp1, cp1, len2);
- best_result = result;
- best_j = 0;
- j = 0;
+ best_result = result;
+ best_j = 0;
+ j = 0;
- for ( j=1; j<=len1-len2; j++) {
- aj_m1 = (double)cp1[j-1];
- aj_lm1 = (double)cp1[j+len2-1];
+ for ( j=1; j<=len1-len2; j++) {
+ aj_m1 = (double)cp1[j-1];
+ aj_lm1 = (double)cp1[j+len2-1];
- result = result + aj_lm1*aj_lm1 - aj_m1*aj_m1;
+ result = result + aj_lm1*aj_lm1 - aj_m1*aj_m1;
- if ( result > best_result ) {
- best_result = result;
- best_j = j;
- }
-
- }
+ if ( result > best_result ) {
+ best_result = result;
+ best_j = j;
+ }
+
+ }
- return PyInt_FromLong(best_j);
+ return PyInt_FromLong(best_j);
}
static PyObject *
audioop_avgpp(PyObject *self, PyObject *args)
{
- signed char *cp;
- int len, size, val = 0, prevval = 0, prevextremevalid = 0,
- prevextreme = 0;
- int i;
- double avg = 0.0;
- int diff, prevdiff, extremediff, nextreme = 0;
-
- if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
- return 0;
- if ( size != 1 && size != 2 && size != 4 ) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
- /* Compute first delta value ahead. Also automatically makes us
- ** skip the first extreme value
- */
- if ( size == 1 ) prevval = (int)*CHARP(cp, 0);
- else if ( size == 2 ) prevval = (int)*SHORTP(cp, 0);
- else if ( size == 4 ) prevval = (int)*LONGP(cp, 0);
- if ( size == 1 ) val = (int)*CHARP(cp, size);
- else if ( size == 2 ) val = (int)*SHORTP(cp, size);
- else if ( size == 4 ) val = (int)*LONGP(cp, size);
- prevdiff = val - prevval;
+ signed char *cp;
+ int len, size, val = 0, prevval = 0, prevextremevalid = 0,
+ prevextreme = 0;
+ int i;
+ double avg = 0.0;
+ int diff, prevdiff, extremediff, nextreme = 0;
+
+ if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
+ return 0;
+ if ( size != 1 && size != 2 && size != 4 ) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
+ /* Compute first delta value ahead. Also automatically makes us
+ ** skip the first extreme value
+ */
+ if ( size == 1 ) prevval = (int)*CHARP(cp, 0);
+ else if ( size == 2 ) prevval = (int)*SHORTP(cp, 0);
+ else if ( size == 4 ) prevval = (int)*LONGP(cp, 0);
+ if ( size == 1 ) val = (int)*CHARP(cp, size);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, size);
+ else if ( size == 4 ) val = (int)*LONGP(cp, size);
+ prevdiff = val - prevval;
- for ( i=size; i<len; i+= size) {
- if ( size == 1 ) val = (int)*CHARP(cp, i);
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = (int)*LONGP(cp, i);
- diff = val - prevval;
- if ( diff*prevdiff < 0 ) {
- /* Derivative changed sign. Compute difference to last
- ** extreme value and remember.
- */
- if ( prevextremevalid ) {
- extremediff = prevval - prevextreme;
- if ( extremediff < 0 )
- extremediff = -extremediff;
- avg += extremediff;
- nextreme++;
- }
- prevextremevalid = 1;
- prevextreme = prevval;
- }
- prevval = val;
- if ( diff != 0 )
- prevdiff = diff;
- }
- if ( nextreme == 0 )
- val = 0;
- else
- val = (int)(avg / (double)nextreme);
- return PyInt_FromLong(val);
+ for ( i=size; i<len; i+= size) {
+ if ( size == 1 ) val = (int)*CHARP(cp, i);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = (int)*LONGP(cp, i);
+ diff = val - prevval;
+ if ( diff*prevdiff < 0 ) {
+ /* Derivative changed sign. Compute difference to last
+ ** extreme value and remember.
+ */
+ if ( prevextremevalid ) {
+ extremediff = prevval - prevextreme;
+ if ( extremediff < 0 )
+ extremediff = -extremediff;
+ avg += extremediff;
+ nextreme++;
+ }
+ prevextremevalid = 1;
+ prevextreme = prevval;
+ }
+ prevval = val;
+ if ( diff != 0 )
+ prevdiff = diff;
+ }
+ if ( nextreme == 0 )
+ val = 0;
+ else
+ val = (int)(avg / (double)nextreme);
+ return PyInt_FromLong(val);
}
static PyObject *
audioop_maxpp(PyObject *self, PyObject *args)
{
- signed char *cp;
- int len, size, val = 0, prevval = 0, prevextremevalid = 0,
- prevextreme = 0;
- int i;
- int max = 0;
- int diff, prevdiff, extremediff;
-
- if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
- return 0;
- if ( size != 1 && size != 2 && size != 4 ) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
- /* Compute first delta value ahead. Also automatically makes us
- ** skip the first extreme value
- */
- if ( size == 1 ) prevval = (int)*CHARP(cp, 0);
- else if ( size == 2 ) prevval = (int)*SHORTP(cp, 0);
- else if ( size == 4 ) prevval = (int)*LONGP(cp, 0);
- if ( size == 1 ) val = (int)*CHARP(cp, size);
- else if ( size == 2 ) val = (int)*SHORTP(cp, size);
- else if ( size == 4 ) val = (int)*LONGP(cp, size);
- prevdiff = val - prevval;
-
- for ( i=size; i<len; i+= size) {
- if ( size == 1 ) val = (int)*CHARP(cp, i);
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = (int)*LONGP(cp, i);
- diff = val - prevval;
- if ( diff*prevdiff < 0 ) {
- /* Derivative changed sign. Compute difference to
- ** last extreme value and remember.
- */
- if ( prevextremevalid ) {
- extremediff = prevval - prevextreme;
- if ( extremediff < 0 )
- extremediff = -extremediff;
- if ( extremediff > max )
- max = extremediff;
- }
- prevextremevalid = 1;
- prevextreme = prevval;
- }
- prevval = val;
- if ( diff != 0 )
- prevdiff = diff;
- }
- return PyInt_FromLong(max);
+ signed char *cp;
+ int len, size, val = 0, prevval = 0, prevextremevalid = 0,
+ prevextreme = 0;
+ int i;
+ int max = 0;
+ int diff, prevdiff, extremediff;
+
+ if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
+ return 0;
+ if ( size != 1 && size != 2 && size != 4 ) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
+ /* Compute first delta value ahead. Also automatically makes us
+ ** skip the first extreme value
+ */
+ if ( size == 1 ) prevval = (int)*CHARP(cp, 0);
+ else if ( size == 2 ) prevval = (int)*SHORTP(cp, 0);
+ else if ( size == 4 ) prevval = (int)*LONGP(cp, 0);
+ if ( size == 1 ) val = (int)*CHARP(cp, size);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, size);
+ else if ( size == 4 ) val = (int)*LONGP(cp, size);
+ prevdiff = val - prevval;
+
+ for ( i=size; i<len; i+= size) {
+ if ( size == 1 ) val = (int)*CHARP(cp, i);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = (int)*LONGP(cp, i);
+ diff = val - prevval;
+ if ( diff*prevdiff < 0 ) {
+ /* Derivative changed sign. Compute difference to
+ ** last extreme value and remember.
+ */
+ if ( prevextremevalid ) {
+ extremediff = prevval - prevextreme;
+ if ( extremediff < 0 )
+ extremediff = -extremediff;
+ if ( extremediff > max )
+ max = extremediff;
+ }
+ prevextremevalid = 1;
+ prevextreme = prevval;
+ }
+ prevval = val;
+ if ( diff != 0 )
+ prevdiff = diff;
+ }
+ return PyInt_FromLong(max);
}
static PyObject *
audioop_cross(PyObject *self, PyObject *args)
{
- signed char *cp;
- int len, size, val = 0;
- int i;
- int prevval, ncross;
-
- if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
- return 0;
- if ( size != 1 && size != 2 && size != 4 ) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
- ncross = -1;
- prevval = 17; /* Anything <> 0,1 */
- for ( i=0; i<len; i+= size) {
- if ( size == 1 ) val = ((int)*CHARP(cp, i)) >> 7;
- else if ( size == 2 ) val = ((int)*SHORTP(cp, i)) >> 15;
- else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 31;
- val = val & 1;
- if ( val != prevval ) ncross++;
- prevval = val;
- }
- return PyInt_FromLong(ncross);
+ signed char *cp;
+ int len, size, val = 0;
+ int i;
+ int prevval, ncross;
+
+ if ( !PyArg_Parse(args, "(s#i)", &cp, &len, &size) )
+ return 0;
+ if ( size != 1 && size != 2 && size != 4 ) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
+ ncross = -1;
+ prevval = 17; /* Anything <> 0,1 */
+ for ( i=0; i<len; i+= size) {
+ if ( size == 1 ) val = ((int)*CHARP(cp, i)) >> 7;
+ else if ( size == 2 ) val = ((int)*SHORTP(cp, i)) >> 15;
+ else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 31;
+ val = val & 1;
+ if ( val != prevval ) ncross++;
+ prevval = val;
+ }
+ return PyInt_FromLong(ncross);
}
static PyObject *
audioop_mul(PyObject *self, PyObject *args)
{
- signed char *cp, *ncp;
- int len, size, val = 0;
- double factor, fval, maxval;
- PyObject *rv;
- int i;
-
- if ( !PyArg_Parse(args, "(s#id)", &cp, &len, &size, &factor ) )
- return 0;
+ signed char *cp, *ncp;
+ int len, size, val = 0;
+ double factor, fval, maxval;
+ PyObject *rv;
+ int i;
+
+ if ( !PyArg_Parse(args, "(s#id)", &cp, &len, &size, &factor ) )
+ return 0;
- if ( size == 1 ) maxval = (double) 0x7f;
- else if ( size == 2 ) maxval = (double) 0x7fff;
- else if ( size == 4 ) maxval = (double) 0x7fffffff;
- else {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ if ( size == 1 ) maxval = (double) 0x7f;
+ else if ( size == 2 ) maxval = (double) 0x7fff;
+ else if ( size == 4 ) maxval = (double) 0x7fffffff;
+ else {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- rv = PyString_FromStringAndSize(NULL, len);
- if ( rv == 0 )
- return 0;
- ncp = (signed char *)PyString_AsString(rv);
+ rv = PyString_FromStringAndSize(NULL, len);
+ if ( rv == 0 )
+ return 0;
+ ncp = (signed char *)PyString_AsString(rv);
- for ( i=0; i < len; i += size ) {
- if ( size == 1 ) val = (int)*CHARP(cp, i);
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = (int)*LONGP(cp, i);
- fval = (double)val*factor;
- if ( fval > maxval ) fval = maxval;
- else if ( fval < -maxval ) fval = -maxval;
- val = (int)fval;
- if ( size == 1 ) *CHARP(ncp, i) = (signed char)val;
- else if ( size == 2 ) *SHORTP(ncp, i) = (short)val;
- else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)val;
- }
- return rv;
+ for ( i=0; i < len; i += size ) {
+ if ( size == 1 ) val = (int)*CHARP(cp, i);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = (int)*LONGP(cp, i);
+ fval = (double)val*factor;
+ if ( fval > maxval ) fval = maxval;
+ else if ( fval < -maxval ) fval = -maxval;
+ val = (int)fval;
+ if ( size == 1 ) *CHARP(ncp, i) = (signed char)val;
+ else if ( size == 2 ) *SHORTP(ncp, i) = (short)val;
+ else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)val;
+ }
+ return rv;
}
static PyObject *
audioop_tomono(PyObject *self, PyObject *args)
{
- signed char *cp, *ncp;
- int len, size, val1 = 0, val2 = 0;
- double fac1, fac2, fval, maxval;
- PyObject *rv;
- int i;
-
- if ( !PyArg_Parse(args, "(s#idd)", &cp, &len, &size, &fac1, &fac2 ) )
- return 0;
+ signed char *cp, *ncp;
+ int len, size, val1 = 0, val2 = 0;
+ double fac1, fac2, fval, maxval;
+ PyObject *rv;
+ int i;
+
+ if ( !PyArg_Parse(args, "(s#idd)", &cp, &len, &size, &fac1, &fac2 ) )
+ return 0;
- if ( size == 1 ) maxval = (double) 0x7f;
- else if ( size == 2 ) maxval = (double) 0x7fff;
- else if ( size == 4 ) maxval = (double) 0x7fffffff;
- else {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ if ( size == 1 ) maxval = (double) 0x7f;
+ else if ( size == 2 ) maxval = (double) 0x7fff;
+ else if ( size == 4 ) maxval = (double) 0x7fffffff;
+ else {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- rv = PyString_FromStringAndSize(NULL, len/2);
- if ( rv == 0 )
- return 0;
- ncp = (signed char *)PyString_AsString(rv);
+ rv = PyString_FromStringAndSize(NULL, len/2);
+ if ( rv == 0 )
+ return 0;
+ ncp = (signed char *)PyString_AsString(rv);
- for ( i=0; i < len; i += size*2 ) {
- if ( size == 1 ) val1 = (int)*CHARP(cp, i);
- else if ( size == 2 ) val1 = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val1 = (int)*LONGP(cp, i);
- if ( size == 1 ) val2 = (int)*CHARP(cp, i+1);
- else if ( size == 2 ) val2 = (int)*SHORTP(cp, i+2);
- else if ( size == 4 ) val2 = (int)*LONGP(cp, i+4);
- fval = (double)val1*fac1 + (double)val2*fac2;
- if ( fval > maxval ) fval = maxval;
- else if ( fval < -maxval ) fval = -maxval;
- val1 = (int)fval;
- if ( size == 1 ) *CHARP(ncp, i/2) = (signed char)val1;
- else if ( size == 2 ) *SHORTP(ncp, i/2) = (short)val1;
- else if ( size == 4 ) *LONGP(ncp, i/2)= (Py_Int32)val1;
- }
- return rv;
+ for ( i=0; i < len; i += size*2 ) {
+ if ( size == 1 ) val1 = (int)*CHARP(cp, i);
+ else if ( size == 2 ) val1 = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val1 = (int)*LONGP(cp, i);
+ if ( size == 1 ) val2 = (int)*CHARP(cp, i+1);
+ else if ( size == 2 ) val2 = (int)*SHORTP(cp, i+2);
+ else if ( size == 4 ) val2 = (int)*LONGP(cp, i+4);
+ fval = (double)val1*fac1 + (double)val2*fac2;
+ if ( fval > maxval ) fval = maxval;
+ else if ( fval < -maxval ) fval = -maxval;
+ val1 = (int)fval;
+ if ( size == 1 ) *CHARP(ncp, i/2) = (signed char)val1;
+ else if ( size == 2 ) *SHORTP(ncp, i/2) = (short)val1;
+ else if ( size == 4 ) *LONGP(ncp, i/2)= (Py_Int32)val1;
+ }
+ return rv;
}
static PyObject *
audioop_tostereo(PyObject *self, PyObject *args)
{
- signed char *cp, *ncp;
- int len, size, val1, val2, val = 0;
- double fac1, fac2, fval, maxval;
- PyObject *rv;
- int i;
-
- if ( !PyArg_Parse(args, "(s#idd)", &cp, &len, &size, &fac1, &fac2 ) )
- return 0;
+ signed char *cp, *ncp;
+ int len, size, val1, val2, val = 0;
+ double fac1, fac2, fval, maxval;
+ PyObject *rv;
+ int i;
+
+ if ( !PyArg_Parse(args, "(s#idd)", &cp, &len, &size, &fac1, &fac2 ) )
+ return 0;
- if ( size == 1 ) maxval = (double) 0x7f;
- else if ( size == 2 ) maxval = (double) 0x7fff;
- else if ( size == 4 ) maxval = (double) 0x7fffffff;
- else {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ if ( size == 1 ) maxval = (double) 0x7f;
+ else if ( size == 2 ) maxval = (double) 0x7fff;
+ else if ( size == 4 ) maxval = (double) 0x7fffffff;
+ else {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- rv = PyString_FromStringAndSize(NULL, len*2);
- if ( rv == 0 )
- return 0;
- ncp = (signed char *)PyString_AsString(rv);
+ rv = PyString_FromStringAndSize(NULL, len*2);
+ if ( rv == 0 )
+ return 0;
+ ncp = (signed char *)PyString_AsString(rv);
- for ( i=0; i < len; i += size ) {
- if ( size == 1 ) val = (int)*CHARP(cp, i);
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = (int)*LONGP(cp, i);
-
- fval = (double)val*fac1;
- if ( fval > maxval ) fval = maxval;
- else if ( fval < -maxval ) fval = -maxval;
- val1 = (int)fval;
-
- fval = (double)val*fac2;
- if ( fval > maxval ) fval = maxval;
- else if ( fval < -maxval ) fval = -maxval;
- val2 = (int)fval;
-
- if ( size == 1 ) *CHARP(ncp, i*2) = (signed char)val1;
- else if ( size == 2 ) *SHORTP(ncp, i*2) = (short)val1;
- else if ( size == 4 ) *LONGP(ncp, i*2) = (Py_Int32)val1;
-
- if ( size == 1 ) *CHARP(ncp, i*2+1) = (signed char)val2;
- else if ( size == 2 ) *SHORTP(ncp, i*2+2) = (short)val2;
- else if ( size == 4 ) *LONGP(ncp, i*2+4) = (Py_Int32)val2;
- }
- return rv;
+ for ( i=0; i < len; i += size ) {
+ if ( size == 1 ) val = (int)*CHARP(cp, i);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = (int)*LONGP(cp, i);
+
+ fval = (double)val*fac1;
+ if ( fval > maxval ) fval = maxval;
+ else if ( fval < -maxval ) fval = -maxval;
+ val1 = (int)fval;
+
+ fval = (double)val*fac2;
+ if ( fval > maxval ) fval = maxval;
+ else if ( fval < -maxval ) fval = -maxval;
+ val2 = (int)fval;
+
+ if ( size == 1 ) *CHARP(ncp, i*2) = (signed char)val1;
+ else if ( size == 2 ) *SHORTP(ncp, i*2) = (short)val1;
+ else if ( size == 4 ) *LONGP(ncp, i*2) = (Py_Int32)val1;
+
+ if ( size == 1 ) *CHARP(ncp, i*2+1) = (signed char)val2;
+ else if ( size == 2 ) *SHORTP(ncp, i*2+2) = (short)val2;
+ else if ( size == 4 ) *LONGP(ncp, i*2+4) = (Py_Int32)val2;
+ }
+ return rv;
}
static PyObject *
audioop_add(PyObject *self, PyObject *args)
{
- signed char *cp1, *cp2, *ncp;
- int len1, len2, size, val1 = 0, val2 = 0, maxval, newval;
- PyObject *rv;
- int i;
-
- if ( !PyArg_Parse(args, "(s#s#i)",
- &cp1, &len1, &cp2, &len2, &size ) )
- return 0;
-
- if ( len1 != len2 ) {
- PyErr_SetString(AudioopError, "Lengths should be the same");
- return 0;
- }
+ signed char *cp1, *cp2, *ncp;
+ int len1, len2, size, val1 = 0, val2 = 0, maxval, newval;
+ PyObject *rv;
+ int i;
+
+ if ( !PyArg_Parse(args, "(s#s#i)",
+ &cp1, &len1, &cp2, &len2, &size ) )
+ return 0;
+
+ if ( len1 != len2 ) {
+ PyErr_SetString(AudioopError, "Lengths should be the same");
+ return 0;
+ }
- if ( size == 1 ) maxval = 0x7f;
- else if ( size == 2 ) maxval = 0x7fff;
- else if ( size == 4 ) maxval = 0x7fffffff;
- else {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
-
- rv = PyString_FromStringAndSize(NULL, len1);
- if ( rv == 0 )
- return 0;
- ncp = (signed char *)PyString_AsString(rv);
-
- for ( i=0; i < len1; i += size ) {
- if ( size == 1 ) val1 = (int)*CHARP(cp1, i);
- else if ( size == 2 ) val1 = (int)*SHORTP(cp1, i);
- else if ( size == 4 ) val1 = (int)*LONGP(cp1, i);
-
- if ( size == 1 ) val2 = (int)*CHARP(cp2, i);
- else if ( size == 2 ) val2 = (int)*SHORTP(cp2, i);
- else if ( size == 4 ) val2 = (int)*LONGP(cp2, i);
-
- newval = val1 + val2;
- /* truncate in case of overflow */
- if (newval > maxval) newval = maxval;
- else if (newval < -maxval) newval = -maxval;
- else if (size == 4 && (newval^val1) < 0 && (newval^val2) < 0)
- newval = val1 > 0 ? maxval : - maxval;
-
- if ( size == 1 ) *CHARP(ncp, i) = (signed char)newval;
- else if ( size == 2 ) *SHORTP(ncp, i) = (short)newval;
- else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)newval;
- }
- return rv;
+ if ( size == 1 ) maxval = 0x7f;
+ else if ( size == 2 ) maxval = 0x7fff;
+ else if ( size == 4 ) maxval = 0x7fffffff;
+ else {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
+
+ rv = PyString_FromStringAndSize(NULL, len1);
+ if ( rv == 0 )
+ return 0;
+ ncp = (signed char *)PyString_AsString(rv);
+
+ for ( i=0; i < len1; i += size ) {
+ if ( size == 1 ) val1 = (int)*CHARP(cp1, i);
+ else if ( size == 2 ) val1 = (int)*SHORTP(cp1, i);
+ else if ( size == 4 ) val1 = (int)*LONGP(cp1, i);
+
+ if ( size == 1 ) val2 = (int)*CHARP(cp2, i);
+ else if ( size == 2 ) val2 = (int)*SHORTP(cp2, i);
+ else if ( size == 4 ) val2 = (int)*LONGP(cp2, i);
+
+ newval = val1 + val2;
+ /* truncate in case of overflow */
+ if (newval > maxval) newval = maxval;
+ else if (newval < -maxval) newval = -maxval;
+ else if (size == 4 && (newval^val1) < 0 && (newval^val2) < 0)
+ newval = val1 > 0 ? maxval : - maxval;
+
+ if ( size == 1 ) *CHARP(ncp, i) = (signed char)newval;
+ else if ( size == 2 ) *SHORTP(ncp, i) = (short)newval;
+ else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)newval;
+ }
+ return rv;
}
static PyObject *
audioop_bias(PyObject *self, PyObject *args)
{
- signed char *cp, *ncp;
- int len, size, val = 0;
- PyObject *rv;
- int i;
- int bias;
-
- if ( !PyArg_Parse(args, "(s#ii)",
- &cp, &len, &size , &bias) )
- return 0;
-
- if ( size != 1 && size != 2 && size != 4) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ signed char *cp, *ncp;
+ int len, size, val = 0;
+ PyObject *rv;
+ int i;
+ int bias;
+
+ if ( !PyArg_Parse(args, "(s#ii)",
+ &cp, &len, &size , &bias) )
+ return 0;
+
+ if ( size != 1 && size != 2 && size != 4) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- rv = PyString_FromStringAndSize(NULL, len);
- if ( rv == 0 )
- return 0;
- ncp = (signed char *)PyString_AsString(rv);
+ rv = PyString_FromStringAndSize(NULL, len);
+ if ( rv == 0 )
+ return 0;
+ ncp = (signed char *)PyString_AsString(rv);
- for ( i=0; i < len; i += size ) {
- if ( size == 1 ) val = (int)*CHARP(cp, i);
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = (int)*LONGP(cp, i);
-
- if ( size == 1 ) *CHARP(ncp, i) = (signed char)(val+bias);
- else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val+bias);
- else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(val+bias);
- }
- return rv;
+ for ( i=0; i < len; i += size ) {
+ if ( size == 1 ) val = (int)*CHARP(cp, i);
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = (int)*LONGP(cp, i);
+
+ if ( size == 1 ) *CHARP(ncp, i) = (signed char)(val+bias);
+ else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val+bias);
+ else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(val+bias);
+ }
+ return rv;
}
static PyObject *
audioop_reverse(PyObject *self, PyObject *args)
{
- signed char *cp;
- unsigned char *ncp;
- int len, size, val = 0;
- PyObject *rv;
- int i, j;
-
- if ( !PyArg_Parse(args, "(s#i)",
- &cp, &len, &size) )
- return 0;
-
- if ( size != 1 && size != 2 && size != 4 ) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ signed char *cp;
+ unsigned char *ncp;
+ int len, size, val = 0;
+ PyObject *rv;
+ int i, j;
+
+ if ( !PyArg_Parse(args, "(s#i)",
+ &cp, &len, &size) )
+ return 0;
+
+ if ( size != 1 && size != 2 && size != 4 ) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- rv = PyString_FromStringAndSize(NULL, len);
- if ( rv == 0 )
- return 0;
- ncp = (unsigned char *)PyString_AsString(rv);
+ rv = PyString_FromStringAndSize(NULL, len);
+ if ( rv == 0 )
+ return 0;
+ ncp = (unsigned char *)PyString_AsString(rv);
- for ( i=0; i < len; i += size ) {
- if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
-
- j = len - i - size;
-
- if ( size == 1 ) *CHARP(ncp, j) = (signed char)(val >> 8);
- else if ( size == 2 ) *SHORTP(ncp, j) = (short)(val);
- else if ( size == 4 ) *LONGP(ncp, j) = (Py_Int32)(val<<16);
- }
- return rv;
+ for ( i=0; i < len; i += size ) {
+ if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
+
+ j = len - i - size;
+
+ if ( size == 1 ) *CHARP(ncp, j) = (signed char)(val >> 8);
+ else if ( size == 2 ) *SHORTP(ncp, j) = (short)(val);
+ else if ( size == 4 ) *LONGP(ncp, j) = (Py_Int32)(val<<16);
+ }
+ return rv;
}
static PyObject *
audioop_lin2lin(PyObject *self, PyObject *args)
{
- signed char *cp;
- unsigned char *ncp;
- int len, size, size2, val = 0;
- PyObject *rv;
- int i, j;
-
- if ( !PyArg_Parse(args, "(s#ii)",
- &cp, &len, &size, &size2) )
- return 0;
-
- if ( (size != 1 && size != 2 && size != 4) ||
- (size2 != 1 && size2 != 2 && size2 != 4)) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ signed char *cp;
+ unsigned char *ncp;
+ int len, size, size2, val = 0;
+ PyObject *rv;
+ int i, j;
+
+ if ( !PyArg_Parse(args, "(s#ii)",
+ &cp, &len, &size, &size2) )
+ return 0;
+
+ if ( (size != 1 && size != 2 && size != 4) ||
+ (size2 != 1 && size2 != 2 && size2 != 4)) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- rv = PyString_FromStringAndSize(NULL, (len/size)*size2);
- if ( rv == 0 )
- return 0;
- ncp = (unsigned char *)PyString_AsString(rv);
+ rv = PyString_FromStringAndSize(NULL, (len/size)*size2);
+ if ( rv == 0 )
+ return 0;
+ ncp = (unsigned char *)PyString_AsString(rv);
- for ( i=0, j=0; i < len; i += size, j += size2 ) {
- if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
-
- if ( size2 == 1 ) *CHARP(ncp, j) = (signed char)(val >> 8);
- else if ( size2 == 2 ) *SHORTP(ncp, j) = (short)(val);
- else if ( size2 == 4 ) *LONGP(ncp, j) = (Py_Int32)(val<<16);
- }
- return rv;
+ for ( i=0, j=0; i < len; i += size, j += size2 ) {
+ if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
+
+ if ( size2 == 1 ) *CHARP(ncp, j) = (signed char)(val >> 8);
+ else if ( size2 == 2 ) *SHORTP(ncp, j) = (short)(val);
+ else if ( size2 == 4 ) *LONGP(ncp, j) = (Py_Int32)(val<<16);
+ }
+ return rv;
}
static int
gcd(int a, int b)
{
- while (b > 0) {
- int tmp = a % b;
- a = b;
- b = tmp;
- }
- return a;
+ while (b > 0) {
+ int tmp = a % b;
+ a = b;
+ b = tmp;
+ }
+ return a;
}
static PyObject *
audioop_ratecv(PyObject *self, PyObject *args)
{
- char *cp, *ncp;
- int len, size, nchannels, inrate, outrate, weightA, weightB;
- int chan, d, *prev_i, *cur_i, cur_o;
- PyObject *state, *samps, *str, *rv = NULL;
- int bytes_per_frame;
-
- weightA = 1;
- weightB = 0;
- if (!PyArg_ParseTuple(args, "s#iiiiO|ii:ratecv", &cp, &len, &size, &nchannels,
- &inrate, &outrate, &state, &weightA, &weightB))
- return NULL;
- if (size != 1 && size != 2 && size != 4) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return NULL;
- }
- if (nchannels < 1) {
- PyErr_SetString(AudioopError, "# of channels should be >= 1");
- return NULL;
- }
- bytes_per_frame = size * nchannels;
- if (bytes_per_frame / nchannels != size) {
- /* This overflow test is rigorously correct because
- both multiplicands are >= 1. Use the argument names
- from the docs for the error msg. */
- PyErr_SetString(PyExc_OverflowError,
- "width * nchannels too big for a C int");
- return NULL;
- }
- if (weightA < 1 || weightB < 0) {
- PyErr_SetString(AudioopError,
- "weightA should be >= 1, weightB should be >= 0");
- return NULL;
- }
- if (len % bytes_per_frame != 0) {
- PyErr_SetString(AudioopError, "not a whole number of frames");
- return NULL;
- }
- if (inrate <= 0 || outrate <= 0) {
- PyErr_SetString(AudioopError, "sampling rate not > 0");
- return NULL;
- }
- /* divide inrate and outrate by their greatest common divisor */
- d = gcd(inrate, outrate);
- inrate /= d;
- outrate /= d;
-
- prev_i = (int *) malloc(nchannels * sizeof(int));
- cur_i = (int *) malloc(nchannels * sizeof(int));
- if (prev_i == NULL || cur_i == NULL) {
- (void) PyErr_NoMemory();
- goto exit;
- }
-
- len /= bytes_per_frame; /* # of frames */
-
- if (state == Py_None) {
- d = -outrate;
- for (chan = 0; chan < nchannels; chan++)
- prev_i[chan] = cur_i[chan] = 0;
- }
- else {
- if (!PyArg_ParseTuple(state,
- "iO!;audioop.ratecv: illegal state argument",
- &d, &PyTuple_Type, &samps))
- goto exit;
- if (PyTuple_Size(samps) != nchannels) {
- PyErr_SetString(AudioopError,
- "illegal state argument");
- goto exit;
- }
- for (chan = 0; chan < nchannels; chan++) {
- if (!PyArg_ParseTuple(PyTuple_GetItem(samps, chan),
- "ii:ratecv",&prev_i[chan],&cur_i[chan]))
- goto exit;
- }
- }
-
- /* str <- Space for the output buffer. */
- {
- /* There are len input frames, so we need (mathematically)
- ceiling(len*outrate/inrate) output frames, and each frame
- requires bytes_per_frame bytes. Computing this
- without spurious overflow is the challenge; we can
- settle for a reasonable upper bound, though. */
- int ceiling; /* the number of output frames */
- int nbytes; /* the number of output bytes needed */
- int q = len / inrate;
- /* Now len = q * inrate + r exactly (with r = len % inrate),
- and this is less than q * inrate + inrate = (q+1)*inrate.
- So a reasonable upper bound on len*outrate/inrate is
- ((q+1)*inrate)*outrate/inrate =
- (q+1)*outrate.
- */
- ceiling = (q+1) * outrate;
- nbytes = ceiling * bytes_per_frame;
- /* See whether anything overflowed; if not, get the space. */
- if (q+1 < 0 ||
- ceiling / outrate != q+1 ||
- nbytes / bytes_per_frame != ceiling)
- str = NULL;
- else
- str = PyString_FromStringAndSize(NULL, nbytes);
-
- if (str == NULL) {
- PyErr_SetString(PyExc_MemoryError,
- "not enough memory for output buffer");
- goto exit;
- }
- }
- ncp = PyString_AsString(str);
-
- for (;;) {
- while (d < 0) {
- if (len == 0) {
- samps = PyTuple_New(nchannels);
- if (samps == NULL)
- goto exit;
- for (chan = 0; chan < nchannels; chan++)
- PyTuple_SetItem(samps, chan,
- Py_BuildValue("(ii)",
- prev_i[chan],
- cur_i[chan]));
- if (PyErr_Occurred())
- goto exit;
- /* We have checked before that the length
- * of the string fits into int. */
- len = (int)(ncp - PyString_AsString(str));
- if (len == 0) {
- /*don't want to resize to zero length*/
- rv = PyString_FromStringAndSize("", 0);
- Py_DECREF(str);
- str = rv;
- } else if (_PyString_Resize(&str, len) < 0)
- goto exit;
- rv = Py_BuildValue("(O(iO))", str, d, samps);
- Py_DECREF(samps);
- Py_DECREF(str);
- goto exit; /* return rv */
- }
- for (chan = 0; chan < nchannels; chan++) {
- prev_i[chan] = cur_i[chan];
- if (size == 1)
- cur_i[chan] = ((int)*CHARP(cp, 0)) << 8;
- else if (size == 2)
- cur_i[chan] = (int)*SHORTP(cp, 0);
- else if (size == 4)
- cur_i[chan] = ((int)*LONGP(cp, 0)) >> 16;
- cp += size;
- /* implements a simple digital filter */
- cur_i[chan] =
- (weightA * cur_i[chan] +
- weightB * prev_i[chan]) /
- (weightA + weightB);
- }
- len--;
- d += outrate;
- }
- while (d >= 0) {
- for (chan = 0; chan < nchannels; chan++) {
- cur_o = (prev_i[chan] * d +
- cur_i[chan] * (outrate - d)) /
- outrate;
- if (size == 1)
- *CHARP(ncp, 0) = (signed char)(cur_o >> 8);
- else if (size == 2)
- *SHORTP(ncp, 0) = (short)(cur_o);
- else if (size == 4)
- *LONGP(ncp, 0) = (Py_Int32)(cur_o<<16);
- ncp += size;
- }
- d -= inrate;
- }
- }
+ char *cp, *ncp;
+ int len, size, nchannels, inrate, outrate, weightA, weightB;
+ int chan, d, *prev_i, *cur_i, cur_o;
+ PyObject *state, *samps, *str, *rv = NULL;
+ int bytes_per_frame;
+
+ weightA = 1;
+ weightB = 0;
+ if (!PyArg_ParseTuple(args, "s#iiiiO|ii:ratecv", &cp, &len, &size, &nchannels,
+ &inrate, &outrate, &state, &weightA, &weightB))
+ return NULL;
+ if (size != 1 && size != 2 && size != 4) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return NULL;
+ }
+ if (nchannels < 1) {
+ PyErr_SetString(AudioopError, "# of channels should be >= 1");
+ return NULL;
+ }
+ bytes_per_frame = size * nchannels;
+ if (bytes_per_frame / nchannels != size) {
+ /* This overflow test is rigorously correct because
+ both multiplicands are >= 1. Use the argument names
+ from the docs for the error msg. */
+ PyErr_SetString(PyExc_OverflowError,
+ "width * nchannels too big for a C int");
+ return NULL;
+ }
+ if (weightA < 1 || weightB < 0) {
+ PyErr_SetString(AudioopError,
+ "weightA should be >= 1, weightB should be >= 0");
+ return NULL;
+ }
+ if (len % bytes_per_frame != 0) {
+ PyErr_SetString(AudioopError, "not a whole number of frames");
+ return NULL;
+ }
+ if (inrate <= 0 || outrate <= 0) {
+ PyErr_SetString(AudioopError, "sampling rate not > 0");
+ return NULL;
+ }
+ /* divide inrate and outrate by their greatest common divisor */
+ d = gcd(inrate, outrate);
+ inrate /= d;
+ outrate /= d;
+
+ prev_i = (int *) malloc(nchannels * sizeof(int));
+ cur_i = (int *) malloc(nchannels * sizeof(int));
+ if (prev_i == NULL || cur_i == NULL) {
+ (void) PyErr_NoMemory();
+ goto exit;
+ }
+
+ len /= bytes_per_frame; /* # of frames */
+
+ if (state == Py_None) {
+ d = -outrate;
+ for (chan = 0; chan < nchannels; chan++)
+ prev_i[chan] = cur_i[chan] = 0;
+ }
+ else {
+ if (!PyArg_ParseTuple(state,
+ "iO!;audioop.ratecv: illegal state argument",
+ &d, &PyTuple_Type, &samps))
+ goto exit;
+ if (PyTuple_Size(samps) != nchannels) {
+ PyErr_SetString(AudioopError,
+ "illegal state argument");
+ goto exit;
+ }
+ for (chan = 0; chan < nchannels; chan++) {
+ if (!PyArg_ParseTuple(PyTuple_GetItem(samps, chan),
+ "ii:ratecv",&prev_i[chan],&cur_i[chan]))
+ goto exit;
+ }
+ }
+
+ /* str <- Space for the output buffer. */
+ {
+ /* There are len input frames, so we need (mathematically)
+ ceiling(len*outrate/inrate) output frames, and each frame
+ requires bytes_per_frame bytes. Computing this
+ without spurious overflow is the challenge; we can
+ settle for a reasonable upper bound, though. */
+ int ceiling; /* the number of output frames */
+ int nbytes; /* the number of output bytes needed */
+ int q = len / inrate;
+ /* Now len = q * inrate + r exactly (with r = len % inrate),
+ and this is less than q * inrate + inrate = (q+1)*inrate.
+ So a reasonable upper bound on len*outrate/inrate is
+ ((q+1)*inrate)*outrate/inrate =
+ (q+1)*outrate.
+ */
+ ceiling = (q+1) * outrate;
+ nbytes = ceiling * bytes_per_frame;
+ /* See whether anything overflowed; if not, get the space. */
+ if (q+1 < 0 ||
+ ceiling / outrate != q+1 ||
+ nbytes / bytes_per_frame != ceiling)
+ str = NULL;
+ else
+ str = PyString_FromStringAndSize(NULL, nbytes);
+
+ if (str == NULL) {
+ PyErr_SetString(PyExc_MemoryError,
+ "not enough memory for output buffer");
+ goto exit;
+ }
+ }
+ ncp = PyString_AsString(str);
+
+ for (;;) {
+ while (d < 0) {
+ if (len == 0) {
+ samps = PyTuple_New(nchannels);
+ if (samps == NULL)
+ goto exit;
+ for (chan = 0; chan < nchannels; chan++)
+ PyTuple_SetItem(samps, chan,
+ Py_BuildValue("(ii)",
+ prev_i[chan],
+ cur_i[chan]));
+ if (PyErr_Occurred())
+ goto exit;
+ /* We have checked before that the length
+ * of the string fits into int. */
+ len = (int)(ncp - PyString_AsString(str));
+ if (len == 0) {
+ /*don't want to resize to zero length*/
+ rv = PyString_FromStringAndSize("", 0);
+ Py_DECREF(str);
+ str = rv;
+ } else if (_PyString_Resize(&str, len) < 0)
+ goto exit;
+ rv = Py_BuildValue("(O(iO))", str, d, samps);
+ Py_DECREF(samps);
+ Py_DECREF(str);
+ goto exit; /* return rv */
+ }
+ for (chan = 0; chan < nchannels; chan++) {
+ prev_i[chan] = cur_i[chan];
+ if (size == 1)
+ cur_i[chan] = ((int)*CHARP(cp, 0)) << 8;
+ else if (size == 2)
+ cur_i[chan] = (int)*SHORTP(cp, 0);
+ else if (size == 4)
+ cur_i[chan] = ((int)*LONGP(cp, 0)) >> 16;
+ cp += size;
+ /* implements a simple digital filter */
+ cur_i[chan] =
+ (weightA * cur_i[chan] +
+ weightB * prev_i[chan]) /
+ (weightA + weightB);
+ }
+ len--;
+ d += outrate;
+ }
+ while (d >= 0) {
+ for (chan = 0; chan < nchannels; chan++) {
+ cur_o = (prev_i[chan] * d +
+ cur_i[chan] * (outrate - d)) /
+ outrate;
+ if (size == 1)
+ *CHARP(ncp, 0) = (signed char)(cur_o >> 8);
+ else if (size == 2)
+ *SHORTP(ncp, 0) = (short)(cur_o);
+ else if (size == 4)
+ *LONGP(ncp, 0) = (Py_Int32)(cur_o<<16);
+ ncp += size;
+ }
+ d -= inrate;
+ }
+ }
exit:
- if (prev_i != NULL)
- free(prev_i);
- if (cur_i != NULL)
- free(cur_i);
- return rv;
+ if (prev_i != NULL)
+ free(prev_i);
+ if (cur_i != NULL)
+ free(cur_i);
+ return rv;
}
static PyObject *
audioop_lin2ulaw(PyObject *self, PyObject *args)
{
- signed char *cp;
- unsigned char *ncp;
- int len, size, val = 0;
- PyObject *rv;
- int i;
-
- if ( !PyArg_Parse(args, "(s#i)",
- &cp, &len, &size) )
- return 0;
-
- if ( size != 1 && size != 2 && size != 4) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ signed char *cp;
+ unsigned char *ncp;
+ int len, size, val = 0;
+ PyObject *rv;
+ int i;
+
+ if ( !PyArg_Parse(args, "(s#i)",
+ &cp, &len, &size) )
+ return 0;
+
+ if ( size != 1 && size != 2 && size != 4) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- rv = PyString_FromStringAndSize(NULL, len/size);
- if ( rv == 0 )
- return 0;
- ncp = (unsigned char *)PyString_AsString(rv);
+ rv = PyString_FromStringAndSize(NULL, len/size);
+ if ( rv == 0 )
+ return 0;
+ ncp = (unsigned char *)PyString_AsString(rv);
- for ( i=0; i < len; i += size ) {
- if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
-
- *ncp++ = st_14linear2ulaw(val);
- }
- return rv;
+ for ( i=0; i < len; i += size ) {
+ if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
+
+ *ncp++ = st_14linear2ulaw(val);
+ }
+ return rv;
}
static PyObject *
audioop_ulaw2lin(PyObject *self, PyObject *args)
{
- unsigned char *cp;
- unsigned char cval;
- signed char *ncp;
- int len, size, val;
- PyObject *rv;
- int i;
-
- if ( !PyArg_Parse(args, "(s#i)",
- &cp, &len, &size) )
- return 0;
-
- if ( size != 1 && size != 2 && size != 4) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ unsigned char *cp;
+ unsigned char cval;
+ signed char *ncp;
+ int len, size, val;
+ PyObject *rv;
+ int i;
+
+ if ( !PyArg_Parse(args, "(s#i)",
+ &cp, &len, &size) )
+ return 0;
+
+ if ( size != 1 && size != 2 && size != 4) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- rv = PyString_FromStringAndSize(NULL, len*size);
- if ( rv == 0 )
- return 0;
- ncp = (signed char *)PyString_AsString(rv);
+ rv = PyString_FromStringAndSize(NULL, len*size);
+ if ( rv == 0 )
+ return 0;
+ ncp = (signed char *)PyString_AsString(rv);
- for ( i=0; i < len*size; i += size ) {
- cval = *cp++;
- val = st_ulaw2linear16(cval);
-
- if ( size == 1 ) *CHARP(ncp, i) = (signed char)(val >> 8);
- else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val);
- else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(val<<16);
- }
- return rv;
+ for ( i=0; i < len*size; i += size ) {
+ cval = *cp++;
+ val = st_ulaw2linear16(cval);
+
+ if ( size == 1 ) *CHARP(ncp, i) = (signed char)(val >> 8);
+ else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val);
+ else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(val<<16);
+ }
+ return rv;
}
static PyObject *
audioop_lin2alaw(PyObject *self, PyObject *args)
{
- signed char *cp;
- unsigned char *ncp;
- int len, size, val = 0;
- PyObject *rv;
- int i;
-
- if ( !PyArg_Parse(args, "(s#i)",
- &cp, &len, &size) )
- return 0;
-
- if ( size != 1 && size != 2 && size != 4) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ signed char *cp;
+ unsigned char *ncp;
+ int len, size, val = 0;
+ PyObject *rv;
+ int i;
+
+ if ( !PyArg_Parse(args, "(s#i)",
+ &cp, &len, &size) )
+ return 0;
+
+ if ( size != 1 && size != 2 && size != 4) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- rv = PyString_FromStringAndSize(NULL, len/size);
- if ( rv == 0 )
- return 0;
- ncp = (unsigned char *)PyString_AsString(rv);
+ rv = PyString_FromStringAndSize(NULL, len/size);
+ if ( rv == 0 )
+ return 0;
+ ncp = (unsigned char *)PyString_AsString(rv);
- for ( i=0; i < len; i += size ) {
- if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
-
- *ncp++ = st_linear2alaw(val);
- }
- return rv;
+ for ( i=0; i < len; i += size ) {
+ if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
+
+ *ncp++ = st_linear2alaw(val);
+ }
+ return rv;
}
static PyObject *
audioop_alaw2lin(PyObject *self, PyObject *args)
{
- unsigned char *cp;
- unsigned char cval;
- signed char *ncp;
- int len, size, val;
- PyObject *rv;
- int i;
-
- if ( !PyArg_Parse(args, "(s#i)",
- &cp, &len, &size) )
- return 0;
-
- if ( size != 1 && size != 2 && size != 4) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ unsigned char *cp;
+ unsigned char cval;
+ signed char *ncp;
+ int len, size, val;
+ PyObject *rv;
+ int i;
+
+ if ( !PyArg_Parse(args, "(s#i)",
+ &cp, &len, &size) )
+ return 0;
+
+ if ( size != 1 && size != 2 && size != 4) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- rv = PyString_FromStringAndSize(NULL, len*size);
- if ( rv == 0 )
- return 0;
- ncp = (signed char *)PyString_AsString(rv);
+ rv = PyString_FromStringAndSize(NULL, len*size);
+ if ( rv == 0 )
+ return 0;
+ ncp = (signed char *)PyString_AsString(rv);
- for ( i=0; i < len*size; i += size ) {
- cval = *cp++;
- val = st_alaw2linear16(cval);
-
- if ( size == 1 ) *CHARP(ncp, i) = (signed char)(val >> 8);
- else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val);
- else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(val<<16);
- }
- return rv;
+ for ( i=0; i < len*size; i += size ) {
+ cval = *cp++;
+ val = st_alaw2linear16(cval);
+
+ if ( size == 1 ) *CHARP(ncp, i) = (signed char)(val >> 8);
+ else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val);
+ else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(val<<16);
+ }
+ return rv;
}
static PyObject *
audioop_lin2adpcm(PyObject *self, PyObject *args)
{
- signed char *cp;
- signed char *ncp;
- int len, size, val = 0, step, valpred, delta,
- index, sign, vpdiff, diff;
- PyObject *rv, *state, *str;
- int i, outputbuffer = 0, bufferstep;
-
- if ( !PyArg_Parse(args, "(s#iO)",
- &cp, &len, &size, &state) )
- return 0;
+ signed char *cp;
+ signed char *ncp;
+ int len, size, val = 0, step, valpred, delta,
+ index, sign, vpdiff, diff;
+ PyObject *rv, *state, *str;
+ int i, outputbuffer = 0, bufferstep;
+
+ if ( !PyArg_Parse(args, "(s#iO)",
+ &cp, &len, &size, &state) )
+ return 0;
- if ( size != 1 && size != 2 && size != 4) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ if ( size != 1 && size != 2 && size != 4) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- str = PyString_FromStringAndSize(NULL, len/(size*2));
- if ( str == 0 )
- return 0;
- ncp = (signed char *)PyString_AsString(str);
-
- /* Decode state, should have (value, step) */
- if ( state == Py_None ) {
- /* First time, it seems. Set defaults */
- valpred = 0;
- step = 7;
- index = 0;
- } else if ( !PyArg_Parse(state, "(ii)", &valpred, &index) )
- return 0;
-
- step = stepsizeTable[index];
- bufferstep = 1;
-
- for ( i=0; i < len; i += size ) {
- if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
- else if ( size == 2 ) val = (int)*SHORTP(cp, i);
- else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
-
- /* Step 1 - compute difference with previous value */
- diff = val - valpred;
- sign = (diff < 0) ? 8 : 0;
- if ( sign ) diff = (-diff);
-
- /* Step 2 - Divide and clamp */
- /* Note:
- ** This code *approximately* computes:
- ** delta = diff*4/step;
- ** vpdiff = (delta+0.5)*step/4;
- ** but in shift step bits are dropped. The net result of this
- ** is that even if you have fast mul/div hardware you cannot
- ** put it to good use since the fixup would be too expensive.
- */
- delta = 0;
- vpdiff = (step >> 3);
-
- if ( diff >= step ) {
- delta = 4;
- diff -= step;
- vpdiff += step;
- }
- step >>= 1;
- if ( diff >= step ) {
- delta |= 2;
- diff -= step;
- vpdiff += step;
- }
- step >>= 1;
- if ( diff >= step ) {
- delta |= 1;
- vpdiff += step;
- }
-
- /* Step 3 - Update previous value */
- if ( sign )
- valpred -= vpdiff;
- else
- valpred += vpdiff;
-
- /* Step 4 - Clamp previous value to 16 bits */
- if ( valpred > 32767 )
- valpred = 32767;
- else if ( valpred < -32768 )
- valpred = -32768;
-
- /* Step 5 - Assemble value, update index and step values */
- delta |= sign;
-
- index += indexTable[delta];
- if ( index < 0 ) index = 0;
- if ( index > 88 ) index = 88;
- step = stepsizeTable[index];
-
- /* Step 6 - Output value */
- if ( bufferstep ) {
- outputbuffer = (delta << 4) & 0xf0;
- } else {
- *ncp++ = (delta & 0x0f) | outputbuffer;
- }
- bufferstep = !bufferstep;
- }
- rv = Py_BuildValue("(O(ii))", str, valpred, index);
- Py_DECREF(str);
- return rv;
+ str = PyString_FromStringAndSize(NULL, len/(size*2));
+ if ( str == 0 )
+ return 0;
+ ncp = (signed char *)PyString_AsString(str);
+
+ /* Decode state, should have (value, step) */
+ if ( state == Py_None ) {
+ /* First time, it seems. Set defaults */
+ valpred = 0;
+ step = 7;
+ index = 0;
+ } else if ( !PyArg_Parse(state, "(ii)", &valpred, &index) )
+ return 0;
+
+ step = stepsizeTable[index];
+ bufferstep = 1;
+
+ for ( i=0; i < len; i += size ) {
+ if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
+ else if ( size == 2 ) val = (int)*SHORTP(cp, i);
+ else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
+
+ /* Step 1 - compute difference with previous value */
+ diff = val - valpred;
+ sign = (diff < 0) ? 8 : 0;
+ if ( sign ) diff = (-diff);
+
+ /* Step 2 - Divide and clamp */
+ /* Note:
+ ** This code *approximately* computes:
+ ** delta = diff*4/step;
+ ** vpdiff = (delta+0.5)*step/4;
+ ** but in shift step bits are dropped. The net result of this
+ ** is that even if you have fast mul/div hardware you cannot
+ ** put it to good use since the fixup would be too expensive.
+ */
+ delta = 0;
+ vpdiff = (step >> 3);
+
+ if ( diff >= step ) {
+ delta = 4;
+ diff -= step;
+ vpdiff += step;
+ }
+ step >>= 1;
+ if ( diff >= step ) {
+ delta |= 2;
+ diff -= step;
+ vpdiff += step;
+ }
+ step >>= 1;
+ if ( diff >= step ) {
+ delta |= 1;
+ vpdiff += step;
+ }
+
+ /* Step 3 - Update previous value */
+ if ( sign )
+ valpred -= vpdiff;
+ else
+ valpred += vpdiff;
+
+ /* Step 4 - Clamp previous value to 16 bits */
+ if ( valpred > 32767 )
+ valpred = 32767;
+ else if ( valpred < -32768 )
+ valpred = -32768;
+
+ /* Step 5 - Assemble value, update index and step values */
+ delta |= sign;
+
+ index += indexTable[delta];
+ if ( index < 0 ) index = 0;
+ if ( index > 88 ) index = 88;
+ step = stepsizeTable[index];
+
+ /* Step 6 - Output value */
+ if ( bufferstep ) {
+ outputbuffer = (delta << 4) & 0xf0;
+ } else {
+ *ncp++ = (delta & 0x0f) | outputbuffer;
+ }
+ bufferstep = !bufferstep;
+ }
+ rv = Py_BuildValue("(O(ii))", str, valpred, index);
+ Py_DECREF(str);
+ return rv;
}
static PyObject *
audioop_adpcm2lin(PyObject *self, PyObject *args)
{
- signed char *cp;
- signed char *ncp;
- int len, size, valpred, step, delta, index, sign, vpdiff;
- PyObject *rv, *str, *state;
- int i, inputbuffer = 0, bufferstep;
-
- if ( !PyArg_Parse(args, "(s#iO)",
- &cp, &len, &size, &state) )
- return 0;
-
- if ( size != 1 && size != 2 && size != 4) {
- PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
- return 0;
- }
+ signed char *cp;
+ signed char *ncp;
+ int len, size, valpred, step, delta, index, sign, vpdiff;
+ PyObject *rv, *str, *state;
+ int i, inputbuffer = 0, bufferstep;
+
+ if ( !PyArg_Parse(args, "(s#iO)",
+ &cp, &len, &size, &state) )
+ return 0;
+
+ if ( size != 1 && size != 2 && size != 4) {
+ PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
+ return 0;
+ }
- /* Decode state, should have (value, step) */
- if ( state == Py_None ) {
- /* First time, it seems. Set defaults */
- valpred = 0;
- step = 7;
- index = 0;
- } else if ( !PyArg_Parse(state, "(ii)", &valpred, &index) )
- return 0;
+ /* Decode state, should have (value, step) */
+ if ( state == Py_None ) {
+ /* First time, it seems. Set defaults */
+ valpred = 0;
+ step = 7;
+ index = 0;
+ } else if ( !PyArg_Parse(state, "(ii)", &valpred, &index) )
+ return 0;
- str = PyString_FromStringAndSize(NULL, len*size*2);
- if ( str == 0 )
- return 0;
- ncp = (signed char *)PyString_AsString(str);
+ str = PyString_FromStringAndSize(NULL, len*size*2);
+ if ( str == 0 )
+ return 0;
+ ncp = (signed char *)PyString_AsString(str);
- step = stepsizeTable[index];
- bufferstep = 0;
+ step = stepsizeTable[index];
+ bufferstep = 0;
- for ( i=0; i < len*size*2; i += size ) {
- /* Step 1 - get the delta value and compute next index */
- if ( bufferstep ) {
- delta = inputbuffer & 0xf;
- } else {
- inputbuffer = *cp++;
- delta = (inputbuffer >> 4) & 0xf;
- }
-
- bufferstep = !bufferstep;
-
- /* Step 2 - Find new index value (for later) */
- index += indexTable[delta];
- if ( index < 0 ) index = 0;
- if ( index > 88 ) index = 88;
-
- /* Step 3 - Separate sign and magnitude */
- sign = delta & 8;
- delta = delta & 7;
-
- /* Step 4 - Compute difference and new predicted value */
- /*
- ** Computes 'vpdiff = (delta+0.5)*step/4', but see comment
- ** in adpcm_coder.
- */
- vpdiff = step >> 3;
- if ( delta & 4 ) vpdiff += step;
- if ( delta & 2 ) vpdiff += step>>1;
- if ( delta & 1 ) vpdiff += step>>2;
-
- if ( sign )
- valpred -= vpdiff;
- else
- valpred += vpdiff;
-
- /* Step 5 - clamp output value */
- if ( valpred > 32767 )
- valpred = 32767;
- else if ( valpred < -32768 )
- valpred = -32768;
-
- /* Step 6 - Update step value */
- step = stepsizeTable[index];
-
- /* Step 6 - Output value */
- if ( size == 1 ) *CHARP(ncp, i) = (signed char)(valpred >> 8);
- else if ( size == 2 ) *SHORTP(ncp, i) = (short)(valpred);
- else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(valpred<<16);
- }
-
- rv = Py_BuildValue("(O(ii))", str, valpred, index);
- Py_DECREF(str);
- return rv;
+ for ( i=0; i < len*size*2; i += size ) {
+ /* Step 1 - get the delta value and compute next index */
+ if ( bufferstep ) {
+ delta = inputbuffer & 0xf;
+ } else {
+ inputbuffer = *cp++;
+ delta = (inputbuffer >> 4) & 0xf;
+ }
+
+ bufferstep = !bufferstep;
+
+ /* Step 2 - Find new index value (for later) */
+ index += indexTable[delta];
+ if ( index < 0 ) index = 0;
+ if ( index > 88 ) index = 88;
+
+ /* Step 3 - Separate sign and magnitude */
+ sign = delta & 8;
+ delta = delta & 7;
+
+ /* Step 4 - Compute difference and new predicted value */
+ /*
+ ** Computes 'vpdiff = (delta+0.5)*step/4', but see comment
+ ** in adpcm_coder.
+ */
+ vpdiff = step >> 3;
+ if ( delta & 4 ) vpdiff += step;
+ if ( delta & 2 ) vpdiff += step>>1;
+ if ( delta & 1 ) vpdiff += step>>2;
+
+ if ( sign )
+ valpred -= vpdiff;
+ else
+ valpred += vpdiff;
+
+ /* Step 5 - clamp output value */
+ if ( valpred > 32767 )
+ valpred = 32767;
+ else if ( valpred < -32768 )
+ valpred = -32768;
+
+ /* Step 6 - Update step value */
+ step = stepsizeTable[index];
+
+ /* Step 6 - Output value */
+ if ( size == 1 ) *CHARP(ncp, i) = (signed char)(valpred >> 8);
+ else if ( size == 2 ) *SHORTP(ncp, i) = (short)(valpred);
+ else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(valpred<<16);
+ }
+
+ rv = Py_BuildValue("(O(ii))", str, valpred, index);
+ Py_DECREF(str);
+ return rv;
}
static PyMethodDef audioop_methods[] = {
- { "max", audioop_max, METH_OLDARGS },
- { "minmax", audioop_minmax, METH_OLDARGS },
- { "avg", audioop_avg, METH_OLDARGS },
- { "maxpp", audioop_maxpp, METH_OLDARGS },
- { "avgpp", audioop_avgpp, METH_OLDARGS },
- { "rms", audioop_rms, METH_OLDARGS },
- { "findfit", audioop_findfit, METH_OLDARGS },
- { "findmax", audioop_findmax, METH_OLDARGS },
- { "findfactor", audioop_findfactor, METH_OLDARGS },
- { "cross", audioop_cross, METH_OLDARGS },
- { "mul", audioop_mul, METH_OLDARGS },
- { "add", audioop_add, METH_OLDARGS },
- { "bias", audioop_bias, METH_OLDARGS },
- { "ulaw2lin", audioop_ulaw2lin, METH_OLDARGS },
- { "lin2ulaw", audioop_lin2ulaw, METH_OLDARGS },
- { "alaw2lin", audioop_alaw2lin, METH_OLDARGS },
- { "lin2alaw", audioop_lin2alaw, METH_OLDARGS },
- { "lin2lin", audioop_lin2lin, METH_OLDARGS },
- { "adpcm2lin", audioop_adpcm2lin, METH_OLDARGS },
- { "lin2adpcm", audioop_lin2adpcm, METH_OLDARGS },
- { "tomono", audioop_tomono, METH_OLDARGS },
- { "tostereo", audioop_tostereo, METH_OLDARGS },
- { "getsample", audioop_getsample, METH_OLDARGS },
- { "reverse", audioop_reverse, METH_OLDARGS },
- { "ratecv", audioop_ratecv, METH_VARARGS },
- { 0, 0 }
+ { "max", audioop_max, METH_OLDARGS },
+ { "minmax", audioop_minmax, METH_OLDARGS },
+ { "avg", audioop_avg, METH_OLDARGS },
+ { "maxpp", audioop_maxpp, METH_OLDARGS },
+ { "avgpp", audioop_avgpp, METH_OLDARGS },
+ { "rms", audioop_rms, METH_OLDARGS },
+ { "findfit", audioop_findfit, METH_OLDARGS },
+ { "findmax", audioop_findmax, METH_OLDARGS },
+ { "findfactor", audioop_findfactor, METH_OLDARGS },
+ { "cross", audioop_cross, METH_OLDARGS },
+ { "mul", audioop_mul, METH_OLDARGS },
+ { "add", audioop_add, METH_OLDARGS },
+ { "bias", audioop_bias, METH_OLDARGS },
+ { "ulaw2lin", audioop_ulaw2lin, METH_OLDARGS },
+ { "lin2ulaw", audioop_lin2ulaw, METH_OLDARGS },
+ { "alaw2lin", audioop_alaw2lin, METH_OLDARGS },
+ { "lin2alaw", audioop_lin2alaw, METH_OLDARGS },
+ { "lin2lin", audioop_lin2lin, METH_OLDARGS },
+ { "adpcm2lin", audioop_adpcm2lin, METH_OLDARGS },
+ { "lin2adpcm", audioop_lin2adpcm, METH_OLDARGS },
+ { "tomono", audioop_tomono, METH_OLDARGS },
+ { "tostereo", audioop_tostereo, METH_OLDARGS },
+ { "getsample", audioop_getsample, METH_OLDARGS },
+ { "reverse", audioop_reverse, METH_OLDARGS },
+ { "ratecv", audioop_ratecv, METH_VARARGS },
+ { 0, 0 }
};
PyMODINIT_FUNC
initaudioop(void)
{
- PyObject *m, *d;
- m = Py_InitModule("audioop", audioop_methods);
- if (m == NULL)
- return;
- d = PyModule_GetDict(m);
- AudioopError = PyErr_NewException("audioop.error", NULL, NULL);
- if (AudioopError != NULL)
- PyDict_SetItemString(d,"error",AudioopError);
+ PyObject *m, *d;
+ m = Py_InitModule("audioop", audioop_methods);
+ if (m == NULL)
+ return;
+ d = PyModule_GetDict(m);
+ AudioopError = PyErr_NewException("audioop.error", NULL, NULL);
+ if (AudioopError != NULL)
+ PyDict_SetItemString(d,"error",AudioopError);
}
projects / thirdparty / Python / cpython.git / commitdiff
