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crc8 checking, based upon a patch by (Miroslav Lichvar <lichvarm at phoenix dot inf dot upol dot cz>)

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less spam/av_log
fix synccode search
channel_order -> decorrelation_type (cosmetic i know, but the old name is too meaningless IMHO)
faster mid/side decorrelator based upon lifting transforms

Originally committed as revision 2793 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-02-18 04:10:52 +00:00
parent 4fd125984b
commit 9d65611096
1 changed files with 88 additions and 38 deletions
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126
libavcodec/flac.c
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@ -34,7 +34,7 @@
#define MAX_CHANNELS 8 #define MAX_CHANNELS 8
#define MAX_BLOCKSIZE 65535 #define MAX_BLOCKSIZE 65535
enum channel_order { enum decorrelation_type {
INDEPENDENT, INDEPENDENT,
LEFT_SIDE, LEFT_SIDE,
RIGHT_SIDE, RIGHT_SIDE,
@ -50,7 +50,7 @@ typedef struct FLACContext {
int samplerate, channels; int samplerate, channels;
int blocksize/*, last_blocksize*/; int blocksize/*, last_blocksize*/;
int bps, curr_bps; int bps, curr_bps;
enum channel_order order; enum decorrelation_type decorrelation;
int32_t *decoded[MAX_CHANNELS]; int32_t *decoded[MAX_CHANNELS];
uint8_t *bitstream; uint8_t *bitstream;
@ -69,6 +69,41 @@ static int sample_rate_table[] =
static int sample_size_table[] = static int sample_size_table[] =
{ 0, 8, 12, 0, 16, 20, 24, 0 }; { 0, 8, 12, 0, 16, 20, 24, 0 };
static const uint8_t table_crc8[256] = {
0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,
0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,
0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,
0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,
0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,
0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,
0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,
0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3
};
static int64_t get_utf8(GetBitContext *gb) static int64_t get_utf8(GetBitContext *gb)
{ {
uint64_t val; uint64_t val;
@ -93,6 +128,17 @@ static int64_t get_utf8(GetBitContext *gb)
return val; return val;
} }
static int get_crc8(uint8_t *buf, int count){
int crc=0;
int i;
for(i=0; i<count; i++){
crc = table_crc8[crc ^ buf[i]];
}
return crc;
}
static int flac_decode_init(AVCodecContext * avctx) static int flac_decode_init(AVCodecContext * avctx)
{ {
return 0; return 0;
@ -199,10 +245,10 @@ static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order)
{ {
int i; int i;
av_log(s->avctx, AV_LOG_DEBUG, " SUBFRAME FIXED\n"); // av_log(s->avctx, AV_LOG_DEBUG, " SUBFRAME FIXED\n");
/* warm up samples */ /* warm up samples */
av_log(s->avctx, AV_LOG_DEBUG, " warm up samples: %d\n", pred_order); // av_log(s->avctx, AV_LOG_DEBUG, " warm up samples: %d\n", pred_order);
for (i = 0; i < pred_order; i++) for (i = 0; i < pred_order; i++)
{ {
@ -270,10 +316,14 @@ static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order)
av_log(s->avctx, AV_LOG_DEBUG, "invalid coeff precision\n"); av_log(s->avctx, AV_LOG_DEBUG, "invalid coeff precision\n");
return -1; return -1;
} }
av_log(s->avctx, AV_LOG_DEBUG, " qlp coeff prec: %d\n", coeff_prec); // av_log(s->avctx, AV_LOG_DEBUG, " qlp coeff prec: %d\n", coeff_prec);
qlevel = get_sbits(&s->gb, 5); qlevel = get_sbits(&s->gb, 5);
av_log(s->avctx, AV_LOG_DEBUG, " quant level: %d\n", qlevel); // av_log(s->avctx, AV_LOG_DEBUG, " quant level: %d\n", qlevel);
assert(qlevel >= 0); //FIXME if(qlevel < 0){
av_log(s->avctx, AV_LOG_DEBUG, "qlevel %d not supported, maybe buggy stream\n", qlevel);
return -1;
}
for (i = 0; i < pred_order; i++) for (i = 0; i < pred_order; i++)
{ {
coeffs[i] = get_sbits(&s->gb, coeff_prec); coeffs[i] = get_sbits(&s->gb, coeff_prec);
@ -301,10 +351,10 @@ static inline int decode_subframe(FLACContext *s, int channel)
s->curr_bps = s->bps; s->curr_bps = s->bps;
if(channel == 0){ if(channel == 0){
if(s->order == RIGHT_SIDE) if(s->decorrelation == RIGHT_SIDE)
s->curr_bps++; s->curr_bps++;
}else{ }else{
if(s->order == LEFT_SIDE || s->order == MID_SIDE) if(s->decorrelation == LEFT_SIDE || s->decorrelation == MID_SIDE)
s->curr_bps++; s->curr_bps++;
} }
@ -354,7 +404,7 @@ static inline int decode_subframe(FLACContext *s, int channel)
} }
else if ((type >= 8) && (type <= 12)) else if ((type >= 8) && (type <= 12))
{ {
av_log(s->avctx, AV_LOG_DEBUG, "coding type: fixed\n"); // av_log(s->avctx, AV_LOG_DEBUG, "coding type: fixed\n");
if (decode_subframe_fixed(s, channel, type & ~0x8) < 0) if (decode_subframe_fixed(s, channel, type & ~0x8) < 0)
return -1; return -1;
} }
@ -382,7 +432,7 @@ static inline int decode_subframe(FLACContext *s, int channel)
static int decode_frame(FLACContext *s) static int decode_frame(FLACContext *s)
{ {
int blocksize_code, sample_rate_code, sample_size_code, assignment, i; int blocksize_code, sample_rate_code, sample_size_code, assignment, i, crc8;
blocksize_code = get_bits(&s->gb, 4); blocksize_code = get_bits(&s->gb, 4);
@ -391,25 +441,14 @@ static int decode_frame(FLACContext *s)
assignment = get_bits(&s->gb, 4); /* channel assignment */ assignment = get_bits(&s->gb, 4); /* channel assignment */
if (assignment < 8) if (assignment < 8)
{ {
s->order = INDEPENDENT; s->decorrelation = INDEPENDENT;
if (s->channels != assignment+1) if (s->channels != assignment+1)
av_log(s->avctx, AV_LOG_DEBUG, "channel number and number of assigned channels differ!\n"); av_log(s->avctx, AV_LOG_DEBUG, "channel number and number of assigned channels differ!\n");
av_log(s->avctx, AV_LOG_DEBUG, "channels: %d\n", assignment+1); // av_log(s->avctx, AV_LOG_DEBUG, "channels: %d\n", assignment+1);
} }
else if (assignment == 8) else if (assignment < 11)
{ {
s->order = LEFT_SIDE; s->decorrelation= LEFT_SIDE + assignment - 8;
av_log(s->avctx, AV_LOG_DEBUG, "left/side\n");
}
else if (assignment == 9)
{
s->order = RIGHT_SIDE;
av_log(s->avctx, AV_LOG_DEBUG, "right/side\n");
}
else if (assignment == 10)
{
s->order = MID_SIDE;
av_log(s->avctx, AV_LOG_DEBUG, "mid/side\n");
} }
else else
{ {
@ -484,17 +523,18 @@ static int decode_frame(FLACContext *s)
return -1; return -1;
} }
skip_bits(&s->gb, 8); /* header crc */ skip_bits(&s->gb, 8);
crc8= get_crc8(s->gb.buffer, get_bits_count(&s->gb)/8);
if(crc8){
av_log(s->avctx, AV_LOG_ERROR, "header crc missmatch crc=%2X\n", crc8);
return -1;
}
// dump_headers(s); // dump_headers(s);
/* subframes */ /* subframes */
for (i = 0; i < s->channels; i++) for (i = 0; i < s->channels; i++)
{ {
/* if (s->blocksize != s->last_blocksize)
{
s->decoded[i] = av_realloc(s->decoded[i], sizeof(uint32_t)*s->blocksize);
}*/
// av_log(s->avctx, AV_LOG_DEBUG, "decoded: %x residual: %x\n", s->decoded[i], s->residual[i]); // av_log(s->avctx, AV_LOG_DEBUG, "decoded: %x residual: %x\n", s->decoded[i], s->residual[i]);
if (decode_subframe(s, i) < 0) if (decode_subframe(s, i) < 0)
return -1; return -1;
@ -566,9 +606,6 @@ static int flac_decode_frame(AVCodecContext *avctx,
switch(metadata_type) switch(metadata_type)
{ {
case METADATA_TYPE_STREAMINFO: case METADATA_TYPE_STREAMINFO:
if(metadata_size == 0)
av_log(s->avctx, AV_LOG_DEBUG, "size= 0 WTF!?\n");
metadata_streaminfo(s); metadata_streaminfo(s);
dump_headers(s); dump_headers(s);
break; break;
@ -582,7 +619,7 @@ static int flac_decode_frame(AVCodecContext *avctx,
else else
{ {
tmp = show_bits(&s->gb, 16); tmp = show_bits(&s->gb, 16);
if(tmp != 0xFFF8){ if(tmp != 0xFFF8){
av_log(s->avctx, AV_LOG_ERROR, "FRAME HEADER not here\n"); av_log(s->avctx, AV_LOG_ERROR, "FRAME HEADER not here\n");
while(get_bits_count(&s->gb)/8+2 < buf_size && show_bits(&s->gb, 16) != 0xFFF8) while(get_bits_count(&s->gb)/8+2 < buf_size && show_bits(&s->gb, 16) != 0xFFF8)
@ -590,8 +627,12 @@ static int flac_decode_frame(AVCodecContext *avctx,
goto end; // we may not have enough bits left to decode a frame, so try next time goto end; // we may not have enough bits left to decode a frame, so try next time
} }
skip_bits(&s->gb, 16); skip_bits(&s->gb, 16);
if (decode_frame(s) < 0) if (decode_frame(s) < 0){
av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
s->bitstream_size=0;
s->bitstream_index=0;
return -1; return -1;
}
} }
@ -637,7 +678,7 @@ static int flac_decode_frame(AVCodecContext *avctx,
} }
} }
#else #else
switch(s->order) switch(s->decorrelation)
{ {
case INDEPENDENT: case INDEPENDENT:
for (j = 0; j < s->blocksize; j++) for (j = 0; j < s->blocksize; j++)
@ -669,25 +710,34 @@ static int flac_decode_frame(AVCodecContext *avctx,
int mid, side; int mid, side;
mid = s->decoded[0][i]; mid = s->decoded[0][i];
side = s->decoded[1][i]; side = s->decoded[1][i];
#if 1 //needs to be checked but IMHO it should be binary identical
mid -= side>>1;
*(samples++) = mid + side;
*(samples++) = mid;
#else
mid <<= 1; mid <<= 1;
if (side & 1) if (side & 1)
mid++; mid++;
*(samples++) = (mid + side) >> 1; *(samples++) = (mid + side) >> 1;
*(samples++) = (mid - side) >> 1; *(samples++) = (mid - side) >> 1;
#endif
} }
break; break;
} }
#endif #endif
*data_size = (int8_t *)samples - (int8_t *)data; *data_size = (int8_t *)samples - (int8_t *)data;
av_log(s->avctx, AV_LOG_DEBUG, "data size: %d\n", *data_size); // av_log(s->avctx, AV_LOG_DEBUG, "data size: %d\n", *data_size);
// s->last_blocksize = s->blocksize; // s->last_blocksize = s->blocksize;
end: end:
i= (get_bits_count(&s->gb)+7)/8;; i= (get_bits_count(&s->gb)+7)/8;;
if(i > buf_size){ if(i > buf_size){
av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", i - buf_size); av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", i - buf_size);
s->bitstream_size=0;
s->bitstream_index=0;
return -1; return -1;
} }