[Ffmpeg-cvslog] r5507 - trunk/libavcodec/flac.c
lu_zero
subversion
Wed Jun 21 02:21:26 CEST 2006
Author: lu_zero
Date: Wed Jun 21 02:21:26 2006
New Revision: 5507
Modified:
trunk/libavcodec/flac.c
Log:
fix 24bit flac support, revised from Thibaut Mattern <thibaut.mattern at gmail.com>
Modified: trunk/libavcodec/flac.c
==============================================================================
--- trunk/libavcodec/flac.c (original)
+++ trunk/libavcodec/flac.c Wed Jun 21 02:21:26 2006
@@ -296,7 +296,7 @@
static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order)
{
- int sum, i, j;
+ int i, j;
int coeff_prec, qlevel;
int coeffs[pred_order];
@@ -334,12 +334,24 @@
if (decode_residuals(s, channel, pred_order) < 0)
return -1;
- for (i = pred_order; i < s->blocksize; i++)
- {
- sum = 0;
- for (j = 0; j < pred_order; j++)
- sum += coeffs[j] * s->decoded[channel][i-j-1];
- s->decoded[channel][i] += sum >> qlevel;
+ if (s->bps > 16) {
+ int64_t sum;
+ for (i = pred_order; i < s->blocksize; i++)
+ {
+ sum = 0;
+ for (j = 0; j < pred_order; j++)
+ sum += (int64_t)coeffs[j] * s->decoded[channel][i-j-1];
+ s->decoded[channel][i] += sum >> qlevel;
+ }
+ } else {
+ int sum;
+ for (i = pred_order; i < s->blocksize; i++)
+ {
+ sum = 0;
+ for (j = 0; j < pred_order; j++)
+ sum += coeffs[j] * s->decoded[channel][i-j-1];
+ s->decoded[channel][i] += sum >> qlevel;
+ }
}
return 0;
@@ -538,6 +550,17 @@
return 0;
}
+static inline int16_t shift_to_16_bits(int32_t data, int bps)
+{
+ if (bps == 24) {
+ return (data >> 8);
+ } else if (bps == 20) {
+ return (data >> 4);
+ } else {
+ return data;
+ }
+}
+
static int flac_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
@@ -680,23 +703,25 @@
for (j = 0; j < s->blocksize; j++)
{
for (i = 0; i < s->channels; i++)
- *(samples++) = s->decoded[i][j];
+ *(samples++) = shift_to_16_bits(s->decoded[i][j], s->bps);
}
break;
case LEFT_SIDE:
assert(s->channels == 2);
for (i = 0; i < s->blocksize; i++)
{
- *(samples++) = s->decoded[0][i];
- *(samples++) = s->decoded[0][i] - s->decoded[1][i];
+ *(samples++) = shift_to_16_bits(s->decoded[0][i], s->bps);
+ *(samples++) = shift_to_16_bits(s->decoded[0][i]
+ - s->decoded[1][i], s->bps);
}
break;
case RIGHT_SIDE:
assert(s->channels == 2);
for (i = 0; i < s->blocksize; i++)
{
- *(samples++) = s->decoded[0][i] + s->decoded[1][i];
- *(samples++) = s->decoded[1][i];
+ *(samples++) = shift_to_16_bits(s->decoded[0][i]
+ + s->decoded[1][i], s->bps);
+ *(samples++) = shift_to_16_bits(s->decoded[1][i], s->bps);
}
break;
case MID_SIDE:
@@ -709,8 +734,8 @@
#if 1 //needs to be checked but IMHO it should be binary identical
mid -= side>>1;
- *(samples++) = mid + side;
- *(samples++) = mid;
+ *(samples++) = shift_to_16_bits(mid + side, s->bps);
+ *(samples++) = shift_to_16_bits(mid, s->bps);
#else
mid <<= 1;
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