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Code Issues Releases Activity

avformat/iamf_writer: fix setting num_samples_per_frame for OPUS

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As per section 3.11.1 of the IAMF spec, the sample rate used in Codec Config
for Opus shall be 48kHz, regardless of the original sample rate used during
encoding.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2024-12-11 13:30:23 -03:00
parent 95217872ad
commit 76049d1c45
1 changed files with 12 additions and 4 deletions
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16
libavformat/iamf_writer.c
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@ -112,9 +112,17 @@ static int fill_codec_config(IAMFContext *iamf, const AVStreamGroup *stg,
int j, ret = 0;
codec_config->codec_id = st->codecpar->codec_id;
codec_config->sample_rate = st->codecpar->sample_rate;
codec_config->codec_tag = st->codecpar->codec_tag;
codec_config->nb_samples = st->codecpar->frame_size;
switch (codec_config->codec_id) {
case AV_CODEC_ID_OPUS:
codec_config->sample_rate = 48000;
codec_config->nb_samples = av_rescale(st->codecpar->frame_size, 48000, st->codecpar->sample_rate);
break;
default:
codec_config->sample_rate = st->codecpar->sample_rate;
codec_config->nb_samples = st->codecpar->frame_size;
break;
}
populate_audio_roll_distance(codec_config);
if (st->codecpar->extradata_size) {
codec_config->extradata = av_memdup(st->codecpar->extradata, st->codecpar->extradata_size);
@ -183,9 +191,9 @@ static int add_param_definition(IAMFContext *iamf, AVIAMFParamDefinition *param,
}
if (codec_config) {
if (!param->duration)
param->duration = codec_config->nb_samples;
param->duration = av_rescale(codec_config->nb_samples, param->parameter_rate, codec_config->sample_rate);
if (!param->constant_subblock_duration)
param->constant_subblock_duration = codec_config->nb_samples;
param->constant_subblock_duration = av_rescale(codec_config->nb_samples, param->parameter_rate, codec_config->sample_rate);
}
param_definition = av_mallocz(sizeof(*param_definition));