From db90c46fff420dbcbe62ef6e4603e15ef246c25f Mon Sep 17 00:00:00 2001 From: James Almer Date: Tue, 16 Jul 2024 20:32:40 -0300 Subject: [PATCH] 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 (cherry picked from commit 7dabad079b783e921747de96597ea47cab244a11) --- libavformat/iamf_parse.c | 3 +++ 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 ce463f00e6..4ac3454f41 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];