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fix adpcm swf decoding 

Originally committed as revision 8186 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2007-03-02 10:08:05 +00:00
parent 4906b0267a
commit 387afa9d01
1 changed files with 20 additions and 39 deletions
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59
libavcodec/adpcm.c
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@ -150,10 +150,6 @@ typedef struct ADPCMContext {
int channel; /* for stereo MOVs, decode left, then decode right, then tell it's decoded */
ADPCMChannelStatus status[2];
short sample_buffer[32]; /* hold left samples while waiting for right samples */
/* SWF only */
int nb_bits;
int nb_samples;
} ADPCMContext;
/* XXX: implement encoding */
@ -1240,46 +1236,30 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
{
GetBitContext gb;
const int *table;
int k0, signmask;
int k0, signmask, nb_bits;
int size = buf_size*8;
init_get_bits(&gb, buf, size);
//FIXME the following return -1 may be removed only after
//1. correctly spliting the stream into packets at demuxer or parser level
//2. checking array bounds when writing
//3. moving the global nb_bits header into extradata
return -1;
// first frame, read bits & inital values
if (!c->nb_bits)
{
c->nb_bits = get_bits(&gb, 2)+2;
// av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", c->nb_bits);
//read bits & inital values
nb_bits = get_bits(&gb, 2)+2;
//av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);
table = swf_index_tables[nb_bits-2];
k0 = 1 << (nb_bits-2);
signmask = 1 << (nb_bits-1);
for (i = 0; i < avctx->channels; i++) {
*samples++ = c->status[i].predictor = get_sbits(&gb, 16);
c->status[i].step_index = get_bits(&gb, 6);
}
table = swf_index_tables[c->nb_bits-2];
k0 = 1 << (c->nb_bits-2);
signmask = 1 << (c->nb_bits-1);
while (get_bits_count(&gb) <= size)
while (get_bits_count(&gb) < size)
{
int i;
c->nb_samples++;
// wrap around at every 4096 samples...
if ((c->nb_samples & 0xfff) == 1)
{
for (i = 0; i <= st; i++)
{
*samples++ = c->status[i].predictor = get_sbits(&gb, 16);
c->status[i].step_index = get_bits(&gb, 6);
}
}
// similar to IMA adpcm
for (i = 0; i <= st; i++)
{
int delta = get_bits(&gb, c->nb_bits);
for (i = 0; i < avctx->channels; i++) {
// similar to IMA adpcm
int delta = get_bits(&gb, nb_bits);
int step = step_table[c->status[i].step_index];
long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
int k = k0;
@ -1303,12 +1283,13 @@ return -1;
c->status[i].predictor = av_clip(c->status[i].predictor, -32768, 32767);
*samples++ = c->status[i].predictor;
if (samples >= samples_end) {
av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");
return -1;
}
}
}
// src += get_bits_count(&gb)*8;
src += size;
src += buf_size;
break;
}
case CODEC_ID_ADPCM_YAMAHA: