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Code Issues Releases Activity

avformat/iamf_writer: ensure each layer's channel layout contains all channels from the previous one

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Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2025-06-17 13:43:20 -03:00
parent a7beac704b
commit 9b5abbf387
1 changed files with 22 additions and 2 deletions
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24
libavformat/iamf_writer.c
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@ -245,7 +245,9 @@ int ff_iamf_add_audio_element(IAMFContext *iamf, const AVStreamGroup *stg, void
return AVERROR(EINVAL); return AVERROR(EINVAL);
} }
} }
} else } else {
AVBPrint bp;
for (int j, i = 0; i < iamf_audio_element->nb_layers; i++) { for (int j, i = 0; i < iamf_audio_element->nb_layers; i++) {
const AVIAMFLayer *layer = iamf_audio_element->layers[i]; const AVIAMFLayer *layer = iamf_audio_element->layers[i];
for (j = 0; j < FF_ARRAY_ELEMS(ff_iamf_scalable_ch_layouts); j++) for (j = 0; j < FF_ARRAY_ELEMS(ff_iamf_scalable_ch_layouts); j++)
@ -257,7 +259,6 @@ int ff_iamf_add_audio_element(IAMFContext *iamf, const AVStreamGroup *stg, void
if (!av_channel_layout_compare(&layer->ch_layout, &ff_iamf_expanded_scalable_ch_layouts[j])) if (!av_channel_layout_compare(&layer->ch_layout, &ff_iamf_expanded_scalable_ch_layouts[j]))
break; break;
if (j >= FF_ARRAY_ELEMS(ff_iamf_expanded_scalable_ch_layouts)) { if (j >= FF_ARRAY_ELEMS(ff_iamf_expanded_scalable_ch_layouts)) {
AVBPrint bp;
av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC); av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
av_channel_layout_describe_bprint(&layer->ch_layout, &bp); av_channel_layout_describe_bprint(&layer->ch_layout, &bp);
av_log(log_ctx, AV_LOG_ERROR, "Unsupported channel layout in Audio Element id %"PRId64 av_log(log_ctx, AV_LOG_ERROR, "Unsupported channel layout in Audio Element id %"PRId64
@ -267,6 +268,25 @@ int ff_iamf_add_audio_element(IAMFContext *iamf, const AVStreamGroup *stg, void
return AVERROR(EINVAL); return AVERROR(EINVAL);
} }
} }
if (!i)
continue;
const AVIAMFLayer *prev_layer = iamf_audio_element->layers[i-1];
uint64_t prev_mask = av_channel_layout_subset(&prev_layer->ch_layout, UINT64_MAX);
if (av_channel_layout_subset(&layer->ch_layout, prev_mask) != prev_mask || (layer->ch_layout.nb_channels <=
prev_layer->ch_layout.nb_channels)) {
av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
av_bprintf(&bp, "Channel layout \"");
av_channel_layout_describe_bprint(&layer->ch_layout, &bp);
av_bprintf(&bp, "\" can't follow channel layout \"");
av_channel_layout_describe_bprint(&prev_layer->ch_layout, &bp);
av_bprintf(&bp, "\" in Scalable Audio Element id %"PRId64, stg->id);
av_log(log_ctx, AV_LOG_ERROR, "%s\n", bp.str);
av_bprint_finalize(&bp, NULL);
return AVERROR(EINVAL);
}
}
} }
for (int i = 0; i < iamf->nb_audio_elements; i++) { for (int i = 0; i < iamf->nb_audio_elements; i++) {