virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

Merge remote-tracking branch 'qatar/master'

Browse Source 
* qatar/master:
  add support for Monkey's Audio versions from 3.93

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-03-15 13:42:56 +01:00
commit 2265bb93ff
2 changed files with 90 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

87
libavcodec/apedec.c
View File

@ -176,6 +176,8 @@ static void entropy_decode_stereo_3900(APEContext *ctx, int blockstodecode);
static void entropy_decode_mono_3990(APEContext *ctx, int blockstodecode);
static void entropy_decode_stereo_3990(APEContext *ctx, int blockstodecode);
static void predictor_decode_mono_3930(APEContext *ctx, int count);
static void predictor_decode_stereo_3930(APEContext *ctx, int count);
static void predictor_decode_mono_3950(APEContext *ctx, int count);
static void predictor_decode_stereo_3950(APEContext *ctx, int count);
@ -255,8 +257,13 @@ static av_cold int ape_decode_init(AVCodecContext *avctx)
s->entropy_decode_stereo = entropy_decode_stereo_3990;
}
if (s->fileversion < 3950) {
s->predictor_decode_mono = predictor_decode_mono_3930;
s->predictor_decode_stereo = predictor_decode_stereo_3930;
} else {
s->predictor_decode_mono = predictor_decode_mono_3950;
s->predictor_decode_stereo = predictor_decode_stereo_3950;
}
ff_dsputil_init(&s->dsp, avctx);
avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
@ -603,6 +610,86 @@ static inline int APESIGN(int32_t x) {
return (x < 0) - (x > 0);
}
static av_always_inline int predictor_update_3930(APEPredictor *p,
const int decoded, const int filter,
const int delayA)
{
int32_t predictionA, sign;
int32_t d0, d1, d2, d3;
p->buf[delayA] = p->lastA[filter];
d0 = p->buf[delayA ];
d1 = p->buf[delayA ] - p->buf[delayA - 1];
d2 = p->buf[delayA - 1] - p->buf[delayA - 2];
d3 = p->buf[delayA - 2] - p->buf[delayA - 3];
predictionA = d0 * p->coeffsA[filter][0] +
d1 * p->coeffsA[filter][1] +
d2 * p->coeffsA[filter][2] +
d3 * p->coeffsA[filter][3];
p->lastA[filter] = decoded + (predictionA >> 9);
p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5);
sign = APESIGN(decoded);
p->coeffsA[filter][0] += ((d0 < 0) * 2 - 1) * sign;
p->coeffsA[filter][1] += ((d1 < 0) * 2 - 1) * sign;
p->coeffsA[filter][2] += ((d2 < 0) * 2 - 1) * sign;
p->coeffsA[filter][3] += ((d3 < 0) * 2 - 1) * sign;
return p->filterA[filter];
}
static void predictor_decode_stereo_3930(APEContext *ctx, int count)
{
APEPredictor *p = &ctx->predictor;
int32_t *decoded0 = ctx->decoded[0];
int32_t *decoded1 = ctx->decoded[1];
ape_apply_filters(ctx, ctx->decoded[0], ctx->decoded[1], count);
while (count--) {
/* Predictor Y */
int Y = *decoded1, X = *decoded0;
*decoded0 = predictor_update_3930(p, Y, 0, YDELAYA);
decoded0++;
*decoded1 = predictor_update_3930(p, X, 1, XDELAYA);
decoded1++;
/* Combined */
p->buf++;
/* Have we filled the history buffer? */
if (p->buf == p->historybuffer + HISTORY_SIZE) {
memmove(p->historybuffer, p->buf,
PREDICTOR_SIZE * sizeof(*p->historybuffer));
p->buf = p->historybuffer;
}
}
}
static void predictor_decode_mono_3930(APEContext *ctx, int count)
{
APEPredictor *p = &ctx->predictor;
int32_t *decoded0 = ctx->decoded[0];
ape_apply_filters(ctx, ctx->decoded[0], NULL, count);
while (count--) {
*decoded0 = predictor_update_3930(p, *decoded0, 0, YDELAYA);
decoded0++;
p->buf++;
/* Have we filled the history buffer? */
if (p->buf == p->historybuffer + HISTORY_SIZE) {
memmove(p->historybuffer, p->buf,
PREDICTOR_SIZE * sizeof(*p->historybuffer));
p->buf = p->historybuffer;
}
}
}
static av_always_inline int predictor_update_filter(APEPredictor *p,
const int decoded, const int filter,
const int delayA, const int delayB,

2
libavformat/ape.c
View File

@ -28,7 +28,7 @@
#include "apetag.h"
/* The earliest and latest file formats supported by this library */
#define APE_MIN_VERSION 3950
#define APE_MIN_VERSION 3930
#define APE_MAX_VERSION 3990
#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]