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avcodec/amr*dec: add multichannel support

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This commit is contained in:
Paul B Mahol
2021-09-30 14:18:22 +02:00
parent e26c4d252f
commit f282c34c00
4 changed files with 154 additions and 73 deletions
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44
libavcodec/amr_parser.c
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@@ -39,9 +39,17 @@ typedef struct AMRParseContext {
ParseContext pc;
uint64_t cumulated_size;
uint64_t block_count;
int current_channel;
int remaining;
} AMRParseContext;
static av_cold int amr_parse_init(AVCodecParserContext *s1)
{
AMRParseContext *s = s1->priv_data;
s->remaining = -1;
return 0;
}
static int amr_parse(AVCodecParserContext *s1,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
@@ -57,21 +65,34 @@ static int amr_parse(AVCodecParserContext *s1,
if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) {
next = buf_size;
} else {
if (s->remaining) {
next = s->remaining;
} else {
int mode = (buf[0] >> 3) & 0x0F;
int ch, offset = 0;
if (avctx->codec_id == AV_CODEC_ID_AMR_NB) {
next = amrnb_packed_size[mode];
} else if (avctx->codec_id == AV_CODEC_ID_AMR_WB) {
next = amrwb_packed_size[mode];
for (ch = s->current_channel; ch < avctx->channels; ch++) {
if (s->remaining >= 0) {
next = s->remaining;
} else {
int mode = (buf[offset] >> 3) & 0x0F;
if (avctx->codec_id == AV_CODEC_ID_AMR_NB) {
next = amrnb_packed_size[mode];
} else if (avctx->codec_id == AV_CODEC_ID_AMR_WB) {
next = amrwb_packed_size[mode];
}
}
offset += next;
if (offset >= buf_size) {
s->remaining = offset - buf_size;
next = END_NOT_FOUND;
break;
} else {
s->remaining = -1;
}
}
s->remaining = next - FFMIN(buf_size, next);
if (s->remaining)
next = END_NOT_FOUND;
s->current_channel = ch % avctx->channels;
if (s->remaining < 0)
next = offset;
if (next != END_NOT_FOUND) {
if (s->cumulated_size < UINT64_MAX - next) {
@@ -98,6 +119,7 @@ static int amr_parse(AVCodecParserContext *s1,
const AVCodecParser ff_amr_parser = {
.codec_ids = { AV_CODEC_ID_AMR_NB, AV_CODEC_ID_AMR_WB },
.priv_data_size = sizeof(AMRParseContext),
.parser_init = amr_parse_init,
.parser_parse = amr_parse,
.parser_close = ff_parse_close,
};