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share channel mode constants between the FLAC decoder and FLAC encoder

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Originally committed as revision 18082 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles
2009-03-21 00:44:42 +00:00
parent c15020dd1d
commit 3159780b18
3 changed files with 20 additions and 26 deletions
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25
libavcodec/flacdec.c
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@ -46,13 +46,6 @@
#undef NDEBUG
#include <assert.h>
enum decorrelation_type {
INDEPENDENT,
LEFT_SIDE,
RIGHT_SIDE,
MID_SIDE,
};
typedef struct FLACContext {
FLACSTREAMINFO
@ -63,7 +56,7 @@ typedef struct FLACContext {
int curr_bps; ///< bps for current subframe, adjusted for channel correlation and wasted bits
int sample_shift; ///< shift required to make output samples 16-bit or 32-bit
int is32; ///< flag to indicate if output should be 32-bit instead of 16-bit
enum decorrelation_type decorrelation; ///< channel decorrelation type in the current frame
int decorrelation; ///< channel decorrelation type in the current frame
int got_streaminfo; ///< indicates if the STREAMINFO has been read
int32_t *decoded[FLAC_MAX_CHANNELS]; ///< decoded samples
@ -445,10 +438,10 @@ static inline int decode_subframe(FLACContext *s, int channel)
s->curr_bps = s->bps;
if (channel == 0) {
if (s->decorrelation == RIGHT_SIDE)
if (s->decorrelation == FLAC_CHMODE_RIGHT_SIDE)
s->curr_bps++;
} else {
if (s->decorrelation == LEFT_SIDE || s->decorrelation == MID_SIDE)
if (s->decorrelation == FLAC_CHMODE_LEFT_SIDE || s->decorrelation == FLAC_CHMODE_MID_SIDE)
s->curr_bps++;
}
@ -508,9 +501,9 @@ static int decode_frame(FLACContext *s, int alloc_data_size)
assignment = get_bits(&s->gb, 4); /* channel assignment */
if (assignment < FLAC_MAX_CHANNELS && s->channels == assignment+1)
decorrelation = INDEPENDENT;
decorrelation = FLAC_CHMODE_INDEPENDENT;
else if (assignment >= FLAC_MAX_CHANNELS && assignment < 11 && s->channels == 2)
decorrelation = LEFT_SIDE + assignment - 8;
decorrelation = assignment;
else {
av_log(s->avctx, AV_LOG_ERROR, "unsupported channel assignment %d (channels=%d)\n",
assignment, s->channels);
@ -710,7 +703,7 @@ static int flac_decode_frame(AVCodecContext *avctx,
break;
switch (s->decorrelation) {
case INDEPENDENT:
case FLAC_CHMODE_INDEPENDENT:
for (j = 0; j < s->blocksize; j++) {
for (i = 0; i < s->channels; i++) {
if (s->is32)
@ -720,11 +713,11 @@ static int flac_decode_frame(AVCodecContext *avctx,
}
}
break;
case LEFT_SIDE:
case FLAC_CHMODE_LEFT_SIDE:
DECORRELATE(a,a-b)
case RIGHT_SIDE:
case FLAC_CHMODE_RIGHT_SIDE:
DECORRELATE(a+b,b)
case MID_SIDE:
case FLAC_CHMODE_MID_SIDE:
DECORRELATE( (a-=b>>1) + b, a)
}