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Add pass through support for Opus and VP8; Opus format attribute negotiation

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This patch adds pass through support for Opus and VP8. That includes:

* Format attribute negotiation for Opus. Note that unlike some other codecs,
  the draft RFC specifies having spaces delimiting the attributes in addition
  to ';', so you have "attra=X; attrb=Y". This broke the attribute parsing in
  chan_sip, so a small tweak was also included in this patch for that.

* A format attribute negotiation module for Opus, res_format_attr_opus

* Fast picture update for VP8. Since VP8 uses a different RTCP packet number
  than FIR, this really is specific to VP8 at this time.

Note that the format attribute negotiation in res_pjsip_sdp_rtp was written
by mjordan. The rest of this patch was written completely by Lorenzo Miniero.

Review: https://reviewboard.asterisk.org/r/2723/

(closes issue ASTERISK-21981)
Reported by: Tzafrir Cohen
patches:
  asterisk_opus+vp8_passthrough_20130718.patch uploaded by lminiero (License 6518)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@397526 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Matthew Jordan
2013-08-23 15:42:27 +00:00
parent e31bd332b8
commit 4d348e853c
11 changed files with 543 additions and 25 deletions
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6
main/frame.c
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@@ -1097,9 +1097,13 @@ int ast_codec_get_samples(struct ast_frame *f)
return 160;
}
case AST_FORMAT_CELT:
/* TODO The assumes 20ms delivery right now, which is incorrect */
/* TODO This assumes 20ms delivery right now, which is incorrect */
samples = ast_format_rate(&f->subclass.format) / 50;
break;
case AST_FORMAT_OPUS:
/* TODO This assumes 20ms delivery right now, which is incorrect */
samples = 960;
break;
default:
ast_log(LOG_WARNING, "Unable to calculate samples for format %s\n", ast_getformatname(&f->subclass.format));
}