chan_pjsip: fix switching sending codec when asymmetric_rtp_codec=no

The sending codec is switched to the receiving codec and then
is switched back to the best native codec on EVERY receiving RTP packets.
This is because after call of ast_channel_set_rawwriteformat there is call
of ast_set_write_format which calls set_format which sets rawwriteformat
to the best native format.

This patch adds a new function ast_set_write_format_path which set
specific write path on channel and uses this function to switch
the sending codec.

ASTERISK-26603 #close

Change-Id: I5b7d098f8b254ce8f45546e6c36e5d324737f71d

diff --git a/channels/chan_pjsip.c b/channels/chan_pjsip.c
index b0dba1b472d3c3f777dbecc46f1ebac4325a9ee7..f397accdab110ac5871e6a2e7133768f38f336b7 100644 (file)
--- a/channels/chan_pjsip.c
+++ b/channels/chan_pjsip.c
@@ -679,7 +679,11 @@ static struct ast_frame *chan_pjsip_cng_tone_detected(struct ast_sip_session *se
        return f;
 }
 
-/*! \brief Function called by core to read any waiting frames */
+/*!
+ * \brief Function called by core to read any waiting frames 
+ *
+ * \note The channel is already locked.
+ */
 static struct ast_frame *chan_pjsip_read(struct ast_channel *ast)
 {
        struct ast_sip_channel_pvt *channel = ast_channel_tech_pvt(ast);
@@ -737,8 +741,7 @@ static struct ast_frame *chan_pjsip_read(struct ast_channel *ast)
                ast_debug(1, "Oooh, got a frame with format of %s on channel '%s' when we're sending '%s', switching to match\n",
                        ast_format_get_name(f->subclass.format), ast_channel_name(ast),
                        ast_format_get_name(ast_channel_rawwriteformat(ast)));
-               ast_channel_set_rawwriteformat(ast, f->subclass.format);
-               ast_set_write_format(ast, ast_channel_writeformat(ast));
+               ast_set_write_format_path(ast, ast_channel_writeformat(ast), f->subclass.format);
 
                if (ast_channel_is_bridged(ast)) {
                        ast_channel_set_unbridged_nolock(ast, 1);

diff --git a/include/asterisk/channel.h b/include/asterisk/channel.h
index 9745bc220a409307def6df66f59b6b94c721fc6e..1637371c3b704ef9d407c298c6b6caeef8f62e97 100644 (file)
--- a/include/asterisk/channel.h
+++ b/include/asterisk/channel.h
@@ -1992,6 +1992,21 @@ int ast_prod(struct ast_channel *chan);
  */
 int ast_set_read_format_path(struct ast_channel *chan, struct ast_format *raw_format, struct ast_format *core_format);
 
+/*!
+ * \brief Set specific write path on channel.
+ * \since 13.13.0
+ *
+ * \param chan Channel to setup write path.
+ * \param core_format What the core wants to write.
+ * \param raw_format Raw write format.
+ *
+ * \pre chan is locked
+ *
+ * \retval 0 on success.
+ * \retval -1 on error.
+ */
+int ast_set_write_format_path(struct ast_channel *chan, struct ast_format *core_format, struct ast_format *raw_format);
+
 /*!
  * \brief Sets read format on channel chan from capabilities
  * Set read format for channel to whichever component of "format" is best.

diff --git a/main/channel.c b/main/channel.c
index b4d451a7021f89556040f983709715f30f6aeb25..be31f39f6134d97b8db13d92290efcf9098d6754 100644 (file)
--- a/main/channel.c
+++ b/main/channel.c
@@ -5476,6 +5476,42 @@ int ast_set_read_format_path(struct ast_channel *chan, struct ast_format *raw_fo
        return 0;
 }
 
+int ast_set_write_format_path(struct ast_channel *chan, struct ast_format *core_format, struct ast_format *raw_format)
+{
+       struct ast_trans_pvt *trans_old;
+       struct ast_trans_pvt *trans_new;
+
+       if (ast_format_cmp(ast_channel_rawwriteformat(chan), raw_format) == AST_FORMAT_CMP_EQUAL
+               && ast_format_cmp(ast_channel_writeformat(chan), core_format) == AST_FORMAT_CMP_EQUAL) {
+               /* Nothing to setup */
+               return 0;
+       }
+
+       ast_debug(1, "Channel %s setting write format path: %s -> %s\n",
+               ast_channel_name(chan),
+               ast_format_get_name(core_format),
+               ast_format_get_name(raw_format));
+
+       /* Setup new translation path. */
+       if (ast_format_cmp(raw_format, core_format) != AST_FORMAT_CMP_EQUAL) {
+               trans_new = ast_translator_build_path(raw_format, core_format);
+               if (!trans_new) {
+                       return -1;
+               }
+       } else {
+               /* No translation needed. */
+               trans_new = NULL;
+       }
+       trans_old = ast_channel_writetrans(chan);
+       if (trans_old) {
+               ast_translator_free_path(trans_old);
+       }
+       ast_channel_writetrans_set(chan, trans_new);
+       ast_channel_set_rawwriteformat(chan, raw_format);
+       ast_channel_set_writeformat(chan, core_format);
+       return 0;
+}
+
 struct set_format_access {
        const char *direction;
        struct ast_trans_pvt *(*get_trans)(const struct ast_channel *chan);