virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-21 10:55:51 +02:00
Code Issues Releases Activity

Decode extended bitstream for high-precision WavPack files.

Browse Source 
Patch by Laurent Aimar [(wolf, son of Loki) <at> (videolan) <dot> (org)]

Originally committed as revision 18729 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Laurent Aimar 2009-05-02 05:17:20 +00:00 committed by Kostya Shishkov
parent 92147b6bec
commit 418f77ec6e
1 changed files with 50 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
libavcodec/wavpack.c
View File

@ -57,7 +57,7 @@ enum WP_ID{
WP_ID_INT32INFO,
WP_ID_DATA,
WP_ID_CORR,
WP_ID_FLT,
WP_ID_EXTRABITS,
WP_ID_CHANINFO
};
@ -85,11 +85,15 @@ typedef struct WavpackContext {
int joint;
uint32_t CRC;
GetBitContext gb;
int got_extra_bits;
uint32_t crc_extra_bits;
GetBitContext gb_extra_bits;
int data_size; // in bits
int samples;
int terms;
Decorr decorr[MAX_TERMS];
int zero, one, zeroes;
int extra_bits;
int and, or, shift;
int post_shift;
int hybrid, hybrid_bitrate;
@ -344,6 +348,7 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
int A, B, L, L2, R, R2, bit;
int pos = 0;
uint32_t crc = 0xFFFFFFFF;
uint32_t crc_extra_bits = 0xFFFFFFFF;
int16_t *dst16 = dst;
int32_t *dst32 = dst;
@ -424,6 +429,18 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
if(s->joint)
L += (R -= (L >> 1));
crc = (crc * 3 + L) * 3 + R;
if(s->extra_bits){
L <<= s->extra_bits;
R <<= s->extra_bits;
if(s->got_extra_bits){
L |= get_bits(&s->gb_extra_bits, s->extra_bits);
crc_extra_bits = crc_extra_bits * 9 + (L&0xffff) * 3 + ((unsigned)L>>16);
R |= get_bits(&s->gb_extra_bits, s->extra_bits);
crc_extra_bits = crc_extra_bits * 9 + (R&0xffff) * 3 + ((unsigned)R>>16);
}
}
bit = (L & s->and) | s->or;
if(hires)
*dst32++ = (((L + bit) << s->shift) - bit) << s->post_shift;
@ -441,6 +458,10 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d
av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
return -1;
}
if(s->got_extra_bits && crc_extra_bits != s->crc_extra_bits){
av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
return -1;
}
return count * 2;
}
@ -451,6 +472,7 @@ static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst
int A, S, T, bit;
int pos = 0;
uint32_t crc = 0xFFFFFFFF;
uint32_t crc_extra_bits = 0xFFFFFFFF;
int16_t *dst16 = dst;
int32_t *dst32 = dst;
@ -481,6 +503,15 @@ static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst
}
pos = (pos + 1) & 7;
crc = crc * 3 + S;
if(s->extra_bits){
S <<= s->extra_bits;
if(s->got_extra_bits){
S |= get_bits(&s->gb_extra_bits, s->extra_bits);
crc_extra_bits = crc_extra_bits * 9 + (S&0xffff) * 3 + ((unsigned)S>>16);
}
}
bit = (S & s->and) | s->or;
if(hires)
*dst32++ = (((S + bit) << s->shift) - bit) << s->post_shift;
@ -493,6 +524,10 @@ static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst
av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
return -1;
}
if(s->got_extra_bits && crc_extra_bits != s->crc_extra_bits){
av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
return -1;
}
return count;
}
@ -533,7 +568,9 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
memset(s->ch, 0, sizeof(s->ch));
s->extra_bits = 0;
s->and = s->or = s->shift = 0;
s->got_extra_bits = 0;
s->samples = AV_RL32(buf); buf += 4;
if(!s->samples){
@ -701,7 +738,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
continue;
}
if(buf[0])
s->post_shift = buf[0];
s->extra_bits = buf[0];
else if(buf[1])
s->shift = buf[1];
else if(buf[2]){
@ -719,6 +756,17 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
buf += size;
got_bs = 1;
break;
case WP_ID_EXTRABITS:
if(size <= 4){
av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n", size);
buf += size;
continue;
}
init_get_bits(&s->gb_extra_bits, buf, size * 8);
s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);
buf += size;
s->got_extra_bits = 1;
break;
default:
buf += size;
}