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Code Issues Releases Activity

dcadec: allow the decoder to change the channel layout mid-stream

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This commit is contained in:
Justin Ruggles 2012-10-21 15:12:36 -04:00
parent 93e27f86f1
commit 8ac0f6767b
1 changed files with 1 additions and 17 deletions
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18
libavcodec/dcadec.c
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@ -317,7 +317,6 @@ typedef struct {
/* Primary audio coding header */
int subframes; ///< number of subframes
int is_channels_set; ///< check for if the channel number is already set
int total_channels; ///< number of channels including extensions
int prim_channels; ///< number of primary audio channels
int subband_activity[DCA_PRIM_CHANNELS_MAX]; ///< subband activity count
@ -1831,22 +1830,7 @@ static int dca_decode_frame(AVCodecContext *avctx, void *data,
av_log(avctx, AV_LOG_ERROR, "Non standard configuration %d !\n", s->amode);
return AVERROR_INVALIDDATA;
}
/* There is nothing that prevents a dts frame to change channel configuration
but Libav doesn't support that so only set the channels if it is previously
unset. Ideally during the first probe for channels the crc should be checked
and only set avctx->channels when the crc is ok. Right now the decoder could
set the channels based on a broken first frame.*/
if (s->is_channels_set == 0) {
s->is_channels_set = 1;
avctx->channels = channels;
}
if (avctx->channels != channels) {
av_log(avctx, AV_LOG_ERROR, "DCA decoder does not support number of "
"channels changing in stream. Skipping frame.\n");
return AVERROR_PATCHWELCOME;
}
avctx->channels = channels;
/* get output buffer */
s->frame.nb_samples = 256 * (s->sample_blocks / 8);