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aac_latm: Align inband PCE to the start of the payload

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A strict reading of the spec seems to imply that it should be aligned to
the start of the element instance tag, but that would break all of the
samples with PCEs.

It seems like a well formed LATM stream should have its PCE in the ASC
rather than inband.

Fixes ticket 4544
This commit is contained in:
Alex Converse
2017-02-09 08:58:47 -08:00
parent 3bb24fc344
commit 1fce67d640
1 changed files with 4 additions and 1 deletions
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5
libavcodec/aacdec_template.c
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@@ -2949,6 +2949,7 @@ static int aac_decode_frame_int(AVCodecContext *avctx, void *data,
int err, elem_id;
int samples = 0, multiplier, audio_found = 0, pce_found = 0;
int is_dmono, sce_count = 0;
int payload_alignment;
ac->frame = data;
@@ -2971,6 +2972,7 @@ static int aac_decode_frame_int(AVCodecContext *avctx, void *data,
// This may lead to an undefined profile being signaled
ac->avctx->profile = ac->oc[1].m4ac.object_type - 1;
payload_alignment = get_bits_count(gb);
ac->tags_mapped = 0;
// parse
while ((elem_type = get_bits(gb, 3)) != TYPE_END) {
@@ -3025,7 +3027,8 @@ static int aac_decode_frame_int(AVCodecContext *avctx, void *data,
uint8_t layout_map[MAX_ELEM_ID*4][3];
int tags;
push_output_configuration(ac);
tags = decode_pce(avctx, &ac->oc[1].m4ac, layout_map, gb, 0);
tags = decode_pce(avctx, &ac->oc[1].m4ac, layout_map, gb,
payload_alignment);
if (tags < 0) {
err = tags;
break;