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| author | James Almer <jamrial@gmail.com> | 2024-07-16 20:32:40 -0300 |
|---|---|---|
| committer | James Almer <jamrial@gmail.com> | 2024-07-18 23:27:20 -0300 |
| commit | 7dabad079b783e921747de96597ea47cab244a11 (patch) | |
| tree | 8a6f6e3a902ab1f9628480bdc99a5eec09fcd489 /libavformat | |
| parent | 54b8d5e201c97464625cfb6cfd851ed80976aa44 (diff) | |
| download | ffmpeg-7dabad079b783e921747de96597ea47cab244a11.tar.gz | |
avformat/iamf: byteswap values in OpusHeader
Clause 3.11.1 of IAMF[1] states the values are stored in big endian, in
contrast to the Ogg Encapsulation for Opus[2] where they are in little endian.
[1]https://aomediacodec.github.io/iamf/v1.0.0-errata.html#opus-specific
[2]https://datatracker.ietf.org/doc/html/rfc7845#section-5.1
Signed-off-by: James Almer <jamrial@gmail.com>
Diffstat (limited to 'libavformat')
| -rw-r--r-- | libavformat/iamf_parse.c | 3 | ||||
| -rw-r--r-- | libavformat/iamf_writer.c | 8 |
2 files changed, 9 insertions, 2 deletions
diff --git a/libavformat/iamf_parse.c b/libavformat/iamf_parse.c index 7ad3318833..a176c7d13a 100644 --- a/libavformat/iamf_parse.c +++ b/libavformat/iamf_parse.c @@ -272,6 +272,9 @@ static int update_extradata(AVCodecParameters *codecpar) switch(codecpar->codec_id) { case AV_CODEC_ID_OPUS: AV_WB8(codecpar->extradata + 9, codecpar->ch_layout.nb_channels); + AV_WL16(codecpar->extradata + 10, AV_RB16(codecpar->extradata + 10)); // Byte swap pre-skip + AV_WL32(codecpar->extradata + 12, AV_RB32(codecpar->extradata + 12)); // Byte swap sample rate + AV_WL16(codecpar->extradata + 16, AV_RB16(codecpar->extradata + 16)); // Byte swap Output Gain break; case AV_CODEC_ID_AAC: { uint8_t buf[5]; diff --git a/libavformat/iamf_writer.c b/libavformat/iamf_writer.c index c955e1ecaf..afe7a149cb 100644 --- a/libavformat/iamf_writer.c +++ b/libavformat/iamf_writer.c @@ -42,8 +42,12 @@ static int update_extradata(IAMFCodecConfig *codec_config) if (codec_config->extradata_size < 19) return AVERROR_INVALIDDATA; codec_config->extradata_size -= 8; - memmove(codec_config->extradata, codec_config->extradata + 8, codec_config->extradata_size); - AV_WB8(codec_config->extradata + 1, 2); // set channels to stereo + AV_WB8(codec_config->extradata + 0, AV_RL8(codec_config->extradata + 8)); // version + AV_WB8(codec_config->extradata + 1, 2); // set channels to stereo + AV_WB16(codec_config->extradata + 2, AV_RL16(codec_config->extradata + 10)); // Byte swap pre-skip + AV_WB32(codec_config->extradata + 4, AV_RL32(codec_config->extradata + 12)); // Byte swap sample rate + AV_WB16(codec_config->extradata + 8, 0); // set Output Gain to 0 + AV_WB8(codec_config->extradata + 10, AV_RL8(codec_config->extradata + 18)); // Mapping family break; case AV_CODEC_ID_FLAC: { uint8_t buf[13]; |