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Code Issues Releases Activity

dca_parser: Handle changes in DCA frame size

Browse Source 
A change in framesize caused a perpetual loss of synchronization.
So read (and use) the frame size from the frame header instead of
setting it only once.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
This commit is contained in:
John Stebbins 2013-09-04 13:08:22 -07:00 committed by Diego Biurrun
parent 18a245a2ae
commit 8411baf6f0
1 changed files with 9 additions and 6 deletions
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15
libavcodec/dca_parser.c
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@ -60,10 +60,12 @@ static int dca_find_frame_end(DCAParseContext * pc1, const uint8_t * buf,
if (IS_MARKER(state, i, buf, buf_size)) {
if (pc1->lastmarker && state == pc1->lastmarker) {
start_found = 1;
i++;
break;
} else if (!pc1->lastmarker) {
start_found = 1;
pc1->lastmarker = state;
i++;
break;
}
}
@ -78,9 +80,6 @@ static int dca_find_frame_end(DCAParseContext * pc1, const uint8_t * buf,
if (state == pc1->lastmarker && IS_MARKER(state, i, buf, buf_size)) {
if(pc1->framesize > pc1->size)
continue;
if(!pc1->framesize){
pc1->framesize = pc1->hd_pos ? pc1->hd_pos : pc1->size;
}
pc->frame_start_found = 0;
pc->state = -1;
pc1->size = 0;
@ -102,7 +101,7 @@ static av_cold int dca_parse_init(AVCodecParserContext * s)
}
static int dca_parse_params(const uint8_t *buf, int buf_size, int *duration,
int *sample_rate)
int *sample_rate, int *framesize)
{
GetBitContext gb;
uint8_t hdr[12 + FF_INPUT_BUFFER_PADDING_SIZE] = { 0 };
@ -122,7 +121,11 @@ static int dca_parse_params(const uint8_t *buf, int buf_size, int *duration,
return AVERROR_INVALIDDATA;
*duration = 256 * (sample_blocks / 8);
skip_bits(&gb, 20);
*framesize = get_bits(&gb, 14) + 1;
if (*framesize < 95)
return AVERROR_INVALIDDATA;
skip_bits(&gb, 6);
sr_code = get_bits(&gb, 4);
*sample_rate = avpriv_dca_sample_rates[sr_code];
if (*sample_rate == 0)
@ -153,7 +156,7 @@ static int dca_parse(AVCodecParserContext * s,
}
/* read the duration and sample rate from the frame header */
if (!dca_parse_params(buf, buf_size, &duration, &sample_rate)) {
if (!dca_parse_params(buf, buf_size, &duration, &sample_rate, &pc1->framesize)) {
s->duration = duration;
avctx->sample_rate = sample_rate;
} else