mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-24 12:09:55 +00:00
dithering for the mpeg audio decoder
Originally committed as revision 3903 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
16dd93ab6a
commit
a7a858996f
@ -18,6 +18,10 @@
|
||||
#define MPA_DUAL 2
|
||||
#define MPA_MONO 3
|
||||
|
||||
/* header + layer + bitrate + freq + lsf/mpeg25 */
|
||||
#define SAME_HEADER_MASK \
|
||||
(0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19))
|
||||
|
||||
int l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
|
||||
int mpa_decode_header(AVCodecContext *avctx, uint32_t head);
|
||||
|
||||
@ -29,3 +33,20 @@ extern const int sblimit_table[5];
|
||||
extern const int quant_steps[17];
|
||||
extern const int quant_bits[17];
|
||||
extern const int32_t mpa_enwindow[257];
|
||||
|
||||
/* fast header check for resync */
|
||||
static inline int ff_mpa_check_header(uint32_t header){
|
||||
/* header */
|
||||
if ((header & 0xffe00000) != 0xffe00000)
|
||||
return -1;
|
||||
/* layer check */
|
||||
if ((header & (3<<17)) == 0)
|
||||
return -1;
|
||||
/* bit rate */
|
||||
if ((header & (0xf<<12)) == 0xf<<12)
|
||||
return -1;
|
||||
/* frequency */
|
||||
if ((header & (3<<10)) == 3<<10)
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -99,6 +99,7 @@ typedef struct MPADecodeContext {
|
||||
#endif
|
||||
void (*compute_antialias)(struct MPADecodeContext *s, struct GranuleDef *g);
|
||||
int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3
|
||||
unsigned int dither_state;
|
||||
} MPADecodeContext;
|
||||
|
||||
/* layer 3 "granule" */
|
||||
@ -749,10 +750,11 @@ static void dct32(int32_t *out, int32_t *tab)
|
||||
|
||||
#if FRAC_BITS <= 15
|
||||
|
||||
static inline int round_sample(int sum)
|
||||
static inline int round_sample(int *sum)
|
||||
{
|
||||
int sum1;
|
||||
sum1 = (sum + (1 << (OUT_SHIFT - 1))) >> OUT_SHIFT;
|
||||
sum1 = (*sum) >> OUT_SHIFT;
|
||||
*sum &= (1<<OUT_SHIFT)-1;
|
||||
if (sum1 < -32768)
|
||||
sum1 = -32768;
|
||||
else if (sum1 > 32767)
|
||||
@ -782,10 +784,11 @@ static inline int round_sample(int sum)
|
||||
|
||||
#else
|
||||
|
||||
static inline int round_sample(int64_t sum)
|
||||
static inline int round_sample(int64_t *sum)
|
||||
{
|
||||
int sum1;
|
||||
sum1 = (int)((sum + (int64_t_C(1) << (OUT_SHIFT - 1))) >> OUT_SHIFT);
|
||||
sum1 = (int)((*sum) >> OUT_SHIFT);
|
||||
*sum &= (1<<OUT_SHIFT)-1;
|
||||
if (sum1 < -32768)
|
||||
sum1 = -32768;
|
||||
else if (sum1 > 32767)
|
||||
@ -900,37 +903,37 @@ void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
|
||||
w = window;
|
||||
w2 = window + 31;
|
||||
|
||||
sum = 0;
|
||||
sum = s1->dither_state;
|
||||
p = synth_buf + 16;
|
||||
SUM8(sum, +=, w, p);
|
||||
p = synth_buf + 48;
|
||||
SUM8(sum, -=, w + 32, p);
|
||||
*samples = round_sample(sum);
|
||||
*samples = round_sample(&sum);
|
||||
samples += incr;
|
||||
w++;
|
||||
|
||||
/* we calculate two samples at the same time to avoid one memory
|
||||
access per two sample */
|
||||
for(j=1;j<16;j++) {
|
||||
sum = 0;
|
||||
sum2 = 0;
|
||||
p = synth_buf + 16 + j;
|
||||
SUM8P2(sum, +=, sum2, -=, w, w2, p);
|
||||
p = synth_buf + 48 - j;
|
||||
SUM8P2(sum, -=, sum2, -=, w + 32, w2 + 32, p);
|
||||
|
||||
*samples = round_sample(sum);
|
||||
*samples = round_sample(&sum);
|
||||
samples += incr;
|
||||
*samples2 = round_sample(sum2);
|
||||
sum += sum2;
|
||||
*samples2 = round_sample(&sum);
|
||||
samples2 -= incr;
|
||||
w++;
|
||||
w2--;
|
||||
}
|
||||
|
||||
p = synth_buf + 32;
|
||||
sum = 0;
|
||||
SUM8(sum, -=, w + 32, p);
|
||||
*samples = round_sample(sum);
|
||||
*samples = round_sample(&sum);
|
||||
s1->dither_state= sum;
|
||||
|
||||
offset = (offset - 32) & 511;
|
||||
*synth_buf_offset = offset;
|
||||
@ -1115,28 +1118,6 @@ static void imdct36(int *out, int *in)
|
||||
out[8 - 4] = t1;
|
||||
}
|
||||
|
||||
/* fast header check for resync */
|
||||
static int check_header(uint32_t header)
|
||||
{
|
||||
/* header */
|
||||
if ((header & 0xffe00000) != 0xffe00000)
|
||||
return -1;
|
||||
/* layer check */
|
||||
if (((header >> 17) & 3) == 0)
|
||||
return -1;
|
||||
/* bit rate */
|
||||
if (((header >> 12) & 0xf) == 0xf)
|
||||
return -1;
|
||||
/* frequency */
|
||||
if (((header >> 10) & 3) == 3)
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* header + layer + bitrate + freq + lsf/mpeg25 */
|
||||
#define SAME_HEADER_MASK \
|
||||
(0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19))
|
||||
|
||||
/* header decoding. MUST check the header before because no
|
||||
consistency check is done there. Return 1 if free format found and
|
||||
that the frame size must be computed externally */
|
||||
@ -1244,7 +1225,7 @@ int mpa_decode_header(AVCodecContext *avctx, uint32_t head)
|
||||
MPADecodeContext s1, *s = &s1;
|
||||
memset( s, 0, sizeof(MPADecodeContext) );
|
||||
|
||||
if (check_header(head) != 0)
|
||||
if (ff_mpa_check_header(head) != 0)
|
||||
return -1;
|
||||
|
||||
if (decode_header(s, head) != 0) {
|
||||
@ -2566,7 +2547,7 @@ static int decode_frame(AVCodecContext * avctx,
|
||||
header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
|
||||
(s->inbuf[2] << 8) | s->inbuf[3];
|
||||
|
||||
if (check_header(header) < 0) {
|
||||
if (ff_mpa_check_header(header) < 0) {
|
||||
/* no sync found : move by one byte (inefficient, but simple!) */
|
||||
memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
|
||||
s->inbuf_ptr--;
|
||||
@ -2712,7 +2693,7 @@ static int decode_frame_adu(AVCodecContext * avctx,
|
||||
header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
|
||||
(s->inbuf[2] << 8) | s->inbuf[3] | 0xffe00000;
|
||||
|
||||
if (check_header(header) < 0) { // Bad header, discard frame
|
||||
if (ff_mpa_check_header(header) < 0) { // Bad header, discard frame
|
||||
*data_size = 0;
|
||||
return buf_size;
|
||||
}
|
||||
|
||||
@ -125,8 +125,8 @@ ccc201054669e94717022bb4f2aea4ce *./data/out.yuv
|
||||
stddev: 10.99 PSNR:27.30 bytes:7602176
|
||||
21f8ff9f1daacd9133683bb4ea0f50a4 *./data/a-mp2.mp2
|
||||
95712 ./data/a-mp2.mp2
|
||||
91ab1b253cd360037d3fca67b795aba8 *./data/out.wav
|
||||
stddev:117.02 PSNR: 6.75 bytes:1054720
|
||||
6956f2c5185c4edbae648c614992a14b *./data/out.wav
|
||||
stddev:117.02 PSNR: 6.76 bytes:1054720
|
||||
d056da679e6d6682812fffb28a7f0db6 *./data/a-ac3.rm
|
||||
97983 ./data/a-ac3.rm
|
||||
2d081e0e1f2e9bd4514e9ac8ec41884c *./data/a-g726.wav
|
||||
|
||||
@ -1,21 +1,21 @@
|
||||
ffmpeg regression test
|
||||
8517e7c83227074b8d632477fda310d5 *./data/b-libav.avi
|
||||
342282 ./data/b-libav.avi
|
||||
./data/b-libav.avi CRC=001a3415
|
||||
./data/b-libav.avi CRC=ccab3a27
|
||||
c83444a0e8ef47b6af1d868d1bb21696 *./data/b-libav.asf
|
||||
342967 ./data/b-libav.asf
|
||||
./data/b-libav.asf CRC=750f18c7
|
||||
./data/b-libav.asf CRC=41af1ed9
|
||||
5240a23a9264bc6062d6739c70825ace *./data/b-libav.rm
|
||||
360251 ./data/b-libav.rm
|
||||
90784a1b9589095f20fc6bcc0cc23cc4 *./data/b-libav.mpg
|
||||
387072 ./data/b-libav.mpg
|
||||
./data/b-libav.mpg CRC=16c74225
|
||||
./data/b-libav.mpg CRC=8b644837
|
||||
57a8dfc7926802bb337a9d8918de94a8 *./data/b-libav.swf
|
||||
41816 ./data/b-libav.swf
|
||||
./data/b-libav.swf CRC=2b273fea
|
||||
2b06388316770915293edcbcc693beef *./data/b-libav.ffm
|
||||
389120 ./data/b-libav.ffm
|
||||
./data/b-libav.ffm CRC=f765cbdd
|
||||
./data/b-libav.ffm CRC=688bd1eb
|
||||
794934a02582f8dfc85d1856514cf37c *./data/b-libav.flv
|
||||
339325 ./data/b-libav.flv
|
||||
./data/b-libav.flv CRC=7b9076f8
|
||||
@ -24,7 +24,7 @@ c83444a0e8ef47b6af1d868d1bb21696 *./data/b-libav.asf
|
||||
./data/b-libav.mov CRC=da87a90d
|
||||
fea20ced22451312dd463110e594eda6 *./data/b-libav.nut
|
||||
332415 ./data/b-libav.nut
|
||||
./data/b-libav.nut CRC=001a3415
|
||||
./data/b-libav.nut CRC=ccab3a27
|
||||
29a2c312bbc5b187491183a918556475 *./data/b-libav.dv
|
||||
3600000 ./data/b-libav.dv
|
||||
./data/b-libav.dv CRC=37b096b4
|
||||
|
||||
@ -125,8 +125,8 @@ stddev: 0.00 PSNR:99.99 bytes:7602176
|
||||
stddev: 3.43 PSNR:37.39 bytes:7602176
|
||||
21f8ff9f1daacd9133683bb4ea0f50a4 *./data/a-mp2.mp2
|
||||
95712 ./data/a-mp2.mp2
|
||||
91ab1b253cd360037d3fca67b795aba8 *./data/out.wav
|
||||
stddev:117.02 PSNR: 6.75 bytes:1054720
|
||||
6956f2c5185c4edbae648c614992a14b *./data/out.wav
|
||||
stddev:117.02 PSNR: 6.76 bytes:1054720
|
||||
d056da679e6d6682812fffb28a7f0db6 *./data/a-ac3.rm
|
||||
97983 ./data/a-ac3.rm
|
||||
2d081e0e1f2e9bd4514e9ac8ec41884c *./data/a-g726.wav
|
||||
|
||||
Loading…
Reference in New Issue
Block a user