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Per reference swf/flv adpcm encoder.

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Originally committed as revision 8713 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Benjamin Larsson 2007-04-11 13:10:13 +00:00
parent 3011c6f62e
commit d64b88d440
1 changed files with 28 additions and 0 deletions
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28
libavcodec/adpcm.c
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@ -182,6 +182,9 @@ static int adpcm_encode_init(AVCodecContext *avctx)
avctx->frame_size = BLKSIZE * avctx->channels;
avctx->block_align = BLKSIZE;
break;
case CODEC_ID_ADPCM_SWF:
avctx->frame_size = 4*BLKSIZE * avctx->channels;
break;
default:
return -1;
break;
@ -513,6 +516,31 @@ static int adpcm_encode_frame(AVCodecContext *avctx,
samples += 8 * avctx->channels;
}
break;
case CODEC_ID_ADPCM_SWF:
{
int i;
PutBitContext pb;
init_put_bits(&pb, dst, buf_size*8);
//Store AdpcmCodeSize
put_bits(&pb, 2, 2); //Set 4bits flash adpcm format
//Init the encoder state
for(i=0; i<avctx->channels; i++){
put_bits(&pb, 16, samples[i] & 0xFFFF);
put_bits(&pb, 6, c->status[i].step_index & 0x3F);
c->status[i].prev_sample = (signed short)samples[i];
}
for (i=0 ; i<4096 ; i++) {
put_bits(&pb, 4, adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels*i]) & 0xF);
if (avctx->channels == 2)
put_bits(&pb, 4, adpcm_ima_compress_sample(&c->status[1], samples[2*i+1]) & 0xF);
}
dst += (3 + 2048) * avctx->channels;
break;
}
case CODEC_ID_ADPCM_MS:
for(i=0; i<avctx->channels; i++){
int predictor=0;