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AC-3 decoder, soc revision 33, Jul 17 12:13:40 2006 UTC by cloud9 

getting weired output
but its working

Originally committed as revision 9655 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2007-07-14 15:49:12 +00:00
parent 486637af8e
commit 6bd4660cdb
1 changed files with 20 additions and 12 deletions
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32
libavcodec/ac3dec.c
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@ -1482,7 +1482,7 @@ static void dump_floats(const char *name, int prec, const float *tab, int n)
av_log(NULL, AV_LOG_INFO, "\n");
}
static void window_and_de_interleave(float *output)
/*static void window_and_de_interleave(float *output)
{
int n2, n4, n8;
int k;
@ -1493,22 +1493,26 @@ static void window_and_de_interleave(float *output)
for (k = 0; k < n8; k++) {
output[2 * k] *= window[2 * k];
output[n2 - 2 * k - 1] *= window[n2 - 2 * k - 1];
output[2 * k + 1] *= window[2 * k + 1];
output[n4 + 2 * k] *= window[n4 + 2 * k];
output[n4 + 2 * k + 1] *= window[n4 + 2 * k + 1];
output[n2 - 2 * k - 2] *= window[n2 - 2 * k - 2];
output[n2 + 2 * k] *= window[n2 - 2 * k - 1];
output[n - 2 * k - 1] *= window[n - 2 * k - 1];
output[n2 + 2 * k + 1] *= window[n2 - 2 * k - 2];
output[3 * n4 + 2 * k] *= window[n4 -2 * k - 1];
output[n - 2 * k - 2] *= window[n - 2 * k - 2];
output[3 * n4 + 2 * k + 1] *= window[n4 - 2 * k - 2];
}
}
}*/
static inline void overlap_and_add(float *tmp_output, float *delay, float *output)
{
int n;
for (n = 0; n < BLOCK_SIZE; n++) {
output[n] = 2 * (tmp_output[n] + delay[n]);
output[n] = 2 * (tmp_output[n] * window[n] + delay[n] * window[255 - n]);
delay[n] = tmp_output[BLOCK_SIZE + n];
}
}
@ -1522,14 +1526,14 @@ static inline void do_imdct(AC3DecodeContext *ctx)
if (ctx->output & AC3_OUTPUT_LFEON) {
av_log(NULL, AV_LOG_INFO, "imdct lfe\n");
ff_imdct_calc(&ctx->imdct_ctx_512, ab->tmp_output, ab->transform_coeffs[0], ab->tmp_imdct);
window_and_de_interleave(ab->tmp_output);
//window_and_de_interleave(ab->tmp_output);
overlap_and_add(ab->tmp_output, ab->delay[0], ab->output[0]);
}
for (i = 0; i < ctx->bsi.nfchans; i++) {
if (!(((ab->blksw) >> i) & 1)) {
av_log(NULL, AV_LOG_INFO, "imdct channel %d - block switching not enabled\n", i);
ff_imdct_calc(&ctx->imdct_ctx_512, ab->tmp_output, ab->transform_coeffs[i + 1], ab->tmp_imdct);
window_and_de_interleave(ab->tmp_output);
//window_and_de_interleave(ab->tmp_output);
overlap_and_add(ab->tmp_output, ab->delay[i + 1], ab->output[i + 1]);
} else {
av_log(NULL, AV_LOG_INFO, "imdct channel %d skipping - block switching enabled\n", i);
@ -1813,8 +1817,8 @@ static int ac3_parse_audio_block(AC3DecodeContext * ctx, int index)
do_rematrixing(ctx);
do_imdct(ctx);
for(i = 0; i < nfchans; i++)
dump_floats("channel output", 10, ab->output[i + 1], BLOCK_SIZE);
/*for(i = 0; i < nfchans; i++)
dump_floats("channel output", 10, ab->output[i + 1], BLOCK_SIZE);*/
do_downmix(ctx);
@ -1828,7 +1832,7 @@ static int ac3_parse_audio_block(AC3DecodeContext * ctx, int index)
static inline int16_t convert(float f)
{
short s;
/*short s;
f = f * NORMFACT;
if (f >= 0)
s = (short)(f + 0.5);
@ -1839,7 +1843,10 @@ static inline int16_t convert(float f)
if (s < (short) -MAXSAMPLE)
s = (short) -MAXSAMPLE;
return s;
return s;*/
int a;
a = lrintf(f * 32767.0);
return ((int16_t)a);
}
static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
@ -1915,6 +1922,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
for (;j < avctx->channels; j++) {
for(k = 0; k < BLOCK_SIZE; k++) {
value = convert(ab->output[j][k]);
av_log(NULL, AV_LOG_INFO, "%d\t", value);
*(out_samples++) = value;
}
}