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From: Marvin Scholz <epirat07@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Date: Mon, 31 Mar 2025 22:38:07 +0200
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Subject: Re: [FFmpeg-devel] [PATCH] rtpdec_mpeg4: Add fmtp parsing of
bitrate value
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On 26 Sep 2022, at 21:24, Marvin Scholz wrote:
> According to RFC 6416 the audio stream sender can pass the data rate
> for the audio bitstream as "bitrate=" media format parameter.
>
> Signed-off-by: Marvin Scholz <epirat07@gmail.com>
If there are no comments / objections I intend to push this
in a few days (with corrected authorship).
> ---
> libavformat/rtpdec_mpeg4.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/libavformat/rtpdec_mpeg4.c b/libavformat/rtpdec_mpeg4.c
> index 6531632b2d..06c96b38cb 100644
> --- a/libavformat/rtpdec_mpeg4.c
> +++ b/libavformat/rtpdec_mpeg4.c
> @@ -38,6 +38,7 @@
>
> /** Structure listing useful vars to parse RTP packet payload */
> struct PayloadContext {
> + int bitrate;
> int sizelength;
> int indexlength;
> int indexdeltalength;
> @@ -83,6 +84,9 @@ typedef struct AttrNameMap {
> #define ATTR_NAME_TYPE_INT 0
> #define ATTR_NAME_TYPE_STR 1
> static const AttrNameMap attr_names[] = {
> + { "bitrate", ATTR_NAME_TYPE_INT,
> + offsetof(PayloadContext, bitrate),
> + {0, INT32_MAX} },
> { "SizeLength", ATTR_NAME_TYPE_INT,
> offsetof(PayloadContext, sizelength),
> {0, 32} }, // SizeLength number of bits used to encode AU-size integer value
> @@ -332,6 +336,9 @@ static int parse_fmtp(AVFormatContext *s,
> }
> }
> }
> + if (!strcmp(attr, "bitrate")) {
> + par->bit_rate = data->bitrate;
> + }
> }
> return 0;
> }
>
> base-commit: 0ce405afb8df221b3a975a30b5c229449c8ed7da
> --
> 2.39.5 (Apple Git-154)
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