[SCM] libav/experimental: fix 8- and 24-bit FLAC decoding Patch by Michael Donaghy %md401 A cam P ac P uk% Original thread: date: Jun 10, 2007 4:48 PM subject: [FFmpeg-devel] [PATCH] Bugfix: decoding 8- and 24-bit FLAC files
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 16:01:36 UTC 2013
The following commit has been merged in the experimental branch:
commit 3cce801a0bcbfa849b3d348bb106bf606c0834b2
Author: Michael Donaghy <md401 at cam.ac.uk>
Date: Tue Jun 12 07:59:43 2007 +0000
fix 8- and 24-bit FLAC decoding
Patch by Michael Donaghy %md401 A cam P ac P uk%
Original thread:
date: Jun 10, 2007 4:48 PM
subject: [FFmpeg-devel] [PATCH] Bugfix: decoding 8- and 24-bit FLAC files
Originally committed as revision 9286 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/flac.c b/libavcodec/flac.c
index 1016ed4..b629a91 100644
--- a/libavcodec/flac.c
+++ b/libavcodec/flac.c
@@ -568,17 +568,6 @@ static int decode_frame(FLACContext *s, int alloc_data_size)
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)
@@ -684,8 +673,8 @@ static int flac_decode_frame(AVCodecContext *avctx,
{\
int a= s->decoded[0][i];\
int b= s->decoded[1][i];\
- *(samples++) = (left ) >> (16 - s->bps);\
- *(samples++) = (right) >> (16 - s->bps);\
+ *(samples++) = (left << (24 - s->bps)) >> 8;\
+ *(samples++) = (right << (24 - s->bps)) >> 8;\
}\
break;
@@ -695,7 +684,7 @@ static int flac_decode_frame(AVCodecContext *avctx,
for (j = 0; j < s->blocksize; j++)
{
for (i = 0; i < s->channels; i++)
- *(samples++) = shift_to_16_bits(s->decoded[i][j], s->bps);
+ *(samples++) = (s->decoded[i][j] << (24 - s->bps)) >> 8;
}
break;
case LEFT_SIDE:
--
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