*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file flac.c
* FLAC (Free Lossless Audio Codec) decoder
* @author Alex Beregszaszi
+ *
+ * For more information on the FLAC format, visit:
+ * http://flac.sourceforge.net/
+ *
+ * This decoder can be used in 1 of 2 ways: Either raw FLAC data can be fed
+ * through, starting from the initial 'fLaC' signature; or by passing the
+ * 34-byte streaminfo structure through avctx->extradata[_size] followed
+ * by data starting with the 0xFFF8 marker.
*/
-
+
#include <limits.h>
-
+
#include "avcodec.h"
+#include "bitstream.h"
#include "golomb.h"
+#include "crc.h"
#undef NDEBUG
#include <assert.h>
#define MAX_CHANNELS 8
#define MAX_BLOCKSIZE 65535
+#define FLAC_STREAMINFO_SIZE 34
enum decorrelation_type {
INDEPENDENT,
uint8_t *bitstream;
int bitstream_size;
int bitstream_index;
- int allocated_bitstream_size;
+ unsigned int allocated_bitstream_size;
} FLACContext;
#define METADATA_TYPE_STREAMINFO 0
static int sample_rate_table[] =
{ 0, 0, 0, 0,
8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
- 0, 0, 0, 0 };
+ 0, 0, 0, 0 };
-static int sample_size_table[] =
+static int sample_size_table[] =
{ 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 int blocksize_table[] = {
+ 0, 192, 576<<0, 576<<1, 576<<2, 576<<3, 0, 0,
+256<<0, 256<<1, 256<<2, 256<<3, 256<<4, 256<<5, 256<<6, 256<<7
};
static int64_t get_utf8(GetBitContext *gb)
{
uint64_t val;
int ones=0, bytes;
-
+
while(get_bits1(gb))
ones++;
if (ones==0) bytes=0;
else if(ones==1) return -1;
else bytes= ones - 1;
-
+
val= get_bits(gb, 7-ones);
while(bytes--){
const int tmp = get_bits(gb, 8);
-
+
if((tmp>>6) != 2)
return -1;
val<<=6;
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]];
- }
+#if 0
+static int skip_utf8(GetBitContext *gb)
+{
+ int ones=0, bytes;
- return crc;
+ while(get_bits1(gb))
+ ones++;
+
+ if (ones==0) bytes=0;
+ else if(ones==1) return -1;
+ else bytes= ones - 1;
+
+ skip_bits(gb, 7-ones);
+ while(bytes--){
+ const int tmp = get_bits(gb, 8);
+
+ if((tmp>>6) != 2)
+ return -1;
+ }
+ return 0;
}
+#endif
+
+static void metadata_streaminfo(FLACContext *s);
+static void dump_headers(FLACContext *s);
static int flac_decode_init(AVCodecContext * avctx)
{
+ FLACContext *s = avctx->priv_data;
+ s->avctx = avctx;
+
+ /* initialize based on the demuxer-supplied streamdata header */
+ if (avctx->extradata_size == FLAC_STREAMINFO_SIZE) {
+ init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
+ metadata_streaminfo(s);
+ dump_headers(s);
+ }
+
return 0;
}
}
s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
-// s->bitstream= av_realloc(s->bitstream, s->max_framesize);
}
static void metadata_streaminfo(FLACContext *s)
s->min_framesize = get_bits_long(&s->gb, 24);
s->max_framesize = get_bits_long(&s->gb, 24);
-
+
s->samplerate = get_bits_long(&s->gb, 20);
s->channels = get_bits(&s->gb, 3) + 1;
s->bps = get_bits(&s->gb, 5) + 1;
-
+
s->avctx->channels = s->channels;
s->avctx->sample_rate = s->samplerate;
skip_bits(&s->gb, 36); /* total num of samples */
-
+
skip_bits(&s->gb, 64); /* md5 sum */
skip_bits(&s->gb, 64); /* md5 sum */
-
+
allocate_buffers(s);
}
av_log(s->avctx, AV_LOG_DEBUG, "illegal residual coding method %d\n", method_type);
return -1;
}
-
+
rice_order = get_bits(&s->gb, 4);
samples= s->blocksize >> rice_order;
- sample=
+ sample=
i= pred_order;
for (partition = 0; partition < (1 << rice_order); partition++)
{
// av_log(s->avctx, AV_LOG_DEBUG, "rice coded partition k=%d\n", tmp);
for (; i < samples; i++, sample++){
s->decoded[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
- if(get_bits_count(&s->gb) > s->gb.size_in_bits){
- av_log(s->avctx, AV_LOG_ERROR, "fucking FLAC\n");
- return -1;
- }
}
}
i= 0;
// av_log(s->avctx, AV_LOG_DEBUG, "partitions: %d, samples: %d\n", 1 << rice_order, sample);
return 0;
-}
+}
static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order)
{
int i;
-
+
// av_log(s->avctx, AV_LOG_DEBUG, " SUBFRAME FIXED\n");
-
+
/* warm up samples */
// av_log(s->avctx, AV_LOG_DEBUG, " warm up samples: %d\n", pred_order);
-
+
for (i = 0; i < pred_order; i++)
{
s->decoded[channel][i] = get_sbits(&s->gb, s->curr_bps);
// av_log(s->avctx, AV_LOG_DEBUG, " %d: %d\n", i, s->decoded[channel][i]);
}
-
+
if (decode_residuals(s, channel, pred_order) < 0)
return -1;
break;
case 3:
for (i = pred_order; i < s->blocksize; i++)
- s->decoded[channel][i] += 3*s->decoded[channel][i-1]
+ s->decoded[channel][i] += 3*s->decoded[channel][i-1]
- 3*s->decoded[channel][i-2]
+ s->decoded[channel][i-3];
break;
case 4:
for (i = pred_order; i < s->blocksize; i++)
- s->decoded[channel][i] += 4*s->decoded[channel][i-1]
+ s->decoded[channel][i] += 4*s->decoded[channel][i-1]
- 6*s->decoded[channel][i-2]
+ 4*s->decoded[channel][i-3]
- s->decoded[channel][i-4];
static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order)
{
- int sum, i, j;
+ int i, j;
int coeff_prec, qlevel;
int coeffs[pred_order];
-
+
// av_log(s->avctx, AV_LOG_DEBUG, " SUBFRAME LPC\n");
-
+
/* warm up samples */
// av_log(s->avctx, AV_LOG_DEBUG, " warm up samples: %d\n", pred_order);
-
+
for (i = 0; i < pred_order; i++)
{
s->decoded[channel][i] = get_sbits(&s->gb, s->curr_bps);
// av_log(s->avctx, AV_LOG_DEBUG, " %d: %d\n", i, s->decoded[channel][i]);
}
-
+
coeff_prec = get_bits(&s->gb, 4) + 1;
if (coeff_prec == 16)
{
coeffs[i] = get_sbits(&s->gb, coeff_prec);
// av_log(s->avctx, AV_LOG_DEBUG, " %d: %d\n", i, coeffs[i]);
}
-
+
if (decode_residuals(s, channel, pred_order) < 0)
return -1;
- for (i = pred_order; i < s->blocksize; i++)
- {
- sum = 0;
- for (j = 0; j < pred_order; j++)
- sum += coeffs[j] * s->decoded[channel][i-j-1];
- s->decoded[channel][i] += sum >> qlevel;
+ if (s->bps > 16) {
+ int64_t sum;
+ for (i = pred_order; i < s->blocksize; i++)
+ {
+ sum = 0;
+ for (j = 0; j < pred_order; j++)
+ sum += (int64_t)coeffs[j] * s->decoded[channel][i-j-1];
+ s->decoded[channel][i] += sum >> qlevel;
+ }
+ } else {
+ int sum;
+ for (i = pred_order; i < s->blocksize; i++)
+ {
+ sum = 0;
+ for (j = 0; j < pred_order; j++)
+ sum += coeffs[j] * s->decoded[channel][i-j-1];
+ s->decoded[channel][i] += sum >> qlevel;
+ }
}
-
+
return 0;
}
{
int type, wasted = 0;
int i, tmp;
-
+
s->curr_bps = s->bps;
if(channel == 0){
if(s->decorrelation == RIGHT_SIDE)
if (get_bits1(&s->gb))
{
- av_log(s->avctx, AV_LOG_DEBUG, "invalid subframe padding\n");
+ av_log(s->avctx, AV_LOG_ERROR, "invalid subframe padding\n");
return -1;
}
type = get_bits(&s->gb, 6);
// wasted = get_bits1(&s->gb);
-
+
// if (wasted)
// {
// while (!get_bits1(&s->gb))
}
else
{
- av_log(s->avctx, AV_LOG_DEBUG, "invalid coding type\n");
+ av_log(s->avctx, AV_LOG_ERROR, "invalid coding type\n");
return -1;
}
-
+
if (wasted)
{
int i;
static int decode_frame(FLACContext *s)
{
int blocksize_code, sample_rate_code, sample_size_code, assignment, i, crc8;
-
+ int decorrelation, bps, blocksize, samplerate;
+
blocksize_code = get_bits(&s->gb, 4);
sample_rate_code = get_bits(&s->gb, 4);
-
+
assignment = get_bits(&s->gb, 4); /* channel assignment */
- if (assignment < 8)
- {
- s->decorrelation = INDEPENDENT;
- 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, "channels: %d\n", assignment+1);
- }
- else if (assignment < 11)
- {
- s->decorrelation= LEFT_SIDE + assignment - 8;
- }
+ if (assignment < 8 && s->channels == assignment+1)
+ decorrelation = INDEPENDENT;
+ else if (assignment >=8 && assignment < 11 && s->channels == 2)
+ decorrelation = LEFT_SIDE + assignment - 8;
else
{
- av_log(s->avctx, AV_LOG_DEBUG, "unsupported channel assignment\n");
+ av_log(s->avctx, AV_LOG_ERROR, "unsupported channel assignment %d (channels=%d)\n", assignment, s->channels);
return -1;
}
- if ((assignment >= 8) && (s->channels != 2))
+ sample_size_code = get_bits(&s->gb, 3);
+ if(sample_size_code == 0)
+ bps= s->bps;
+ else if((sample_size_code != 3) && (sample_size_code != 7))
+ bps = sample_size_table[sample_size_code];
+ else
{
+ av_log(s->avctx, AV_LOG_ERROR, "invalid sample size code (%d)\n", sample_size_code);
return -1;
}
-
- sample_size_code = get_bits(&s->gb, 3);
- if (sample_size_code != 0)
- s->bps = sample_size_table[sample_size_code];
- if ((sample_size_code == 3) || (sample_size_code == 7))
+ if (get_bits1(&s->gb))
{
- av_log(s->avctx, AV_LOG_DEBUG, "invalid sample size code (%d)\n", sample_size_code);
+ av_log(s->avctx, AV_LOG_ERROR, "broken stream, invalid padding\n");
return -1;
}
- if (get_bits1(&s->gb))
- {
- av_log(s->avctx, AV_LOG_DEBUG, "broken stream, invalid padding\n");
-// return -1;
+ if(get_utf8(&s->gb) < 0){
+ av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
+ return -1;
}
-
+#if 0
if (/*((blocksize_code == 6) || (blocksize_code == 7)) &&*/
(s->min_blocksize != s->max_blocksize)){
- if(get_utf8(&s->gb) < 0){
- av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
- return -1;
- }
}else{
- if(get_utf8(&s->gb) < 0){
- av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
- return -1;
- }
}
+#endif
if (blocksize_code == 0)
- s->blocksize = s->min_blocksize;
- else if (blocksize_code == 1)
- s->blocksize = 192;
- else if (blocksize_code <= 5)
- s->blocksize = 576 << (blocksize_code - 2);
+ blocksize = s->min_blocksize;
else if (blocksize_code == 6)
- s->blocksize = get_bits(&s->gb, 8)+1;
+ blocksize = get_bits(&s->gb, 8)+1;
else if (blocksize_code == 7)
- s->blocksize = get_bits(&s->gb, 16)+1;
- else if (blocksize_code >= 8)
- s->blocksize = 256 << (blocksize_code - 8);
+ blocksize = get_bits(&s->gb, 16)+1;
+ else
+ blocksize = blocksize_table[blocksize_code];
- if(s->blocksize > s->max_blocksize){
- av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", s->blocksize, s->max_blocksize);
+ if(blocksize > s->max_blocksize){
+ av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", blocksize, s->max_blocksize);
return -1;
}
if (sample_rate_code == 0){
- //Streaminfo
+ samplerate= s->samplerate;
}else if ((sample_rate_code > 3) && (sample_rate_code < 12))
- s->samplerate = sample_rate_table[sample_rate_code];
+ samplerate = sample_rate_table[sample_rate_code];
else if (sample_rate_code == 12)
- s->samplerate = get_bits(&s->gb, 8) * 1000;
+ samplerate = get_bits(&s->gb, 8) * 1000;
else if (sample_rate_code == 13)
- s->samplerate = get_bits(&s->gb, 16);
+ samplerate = get_bits(&s->gb, 16);
else if (sample_rate_code == 14)
- s->samplerate = get_bits(&s->gb, 16) * 10;
+ samplerate = get_bits(&s->gb, 16) * 10;
else{
av_log(s->avctx, AV_LOG_ERROR, "illegal sample rate code %d\n", sample_rate_code);
return -1;
}
skip_bits(&s->gb, 8);
- crc8= get_crc8(s->gb.buffer, get_bits_count(&s->gb)/8);
+ crc8= av_crc(av_crc07, 0, 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);
+ av_log(s->avctx, AV_LOG_ERROR, "header crc mismatch crc=%2X\n", crc8);
return -1;
}
+ s->blocksize = blocksize;
+ s->samplerate = samplerate;
+ s->bps = bps;
+ s->decorrelation= decorrelation;
+
// dump_headers(s);
/* subframes */
if (decode_subframe(s, i) < 0)
return -1;
}
-
+
align_get_bits(&s->gb);
/* frame footer */
return 0;
}
+static inline int16_t shift_to_16_bits(int32_t data, int bps)
+{
+ if (bps == 24) {
+ return (data >> 8);
+ } else if (bps == 20) {
+ return (data >> 4);
+ } else {
+ return data;
+ }
+}
+
static int flac_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
FLACContext *s = avctx->priv_data;
int metadata_last, metadata_type, metadata_size;
- int tmp = 0, i, j = 0, input_buf_size;
- int16_t *samples = data, *left, *right;
-
- *data_size = 0;
+ int tmp = 0, i, j = 0, input_buf_size = 0;
+ int16_t *samples = data;
- s->avctx = avctx;
-
if(s->max_framesize == 0){
- s->max_framesize= 8192; // should hopefully be enough for the first header
+ s->max_framesize= 65536; // should hopefully be enough for the first header
s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
}
if(1 && s->max_framesize){//FIXME truncated
- buf_size= FFMIN(buf_size, s->max_framesize - s->bitstream_size);
+ buf_size= FFMAX(FFMIN(buf_size, s->max_framesize - s->bitstream_size), 0);
input_buf_size= buf_size;
if(s->bitstream_index + s->bitstream_size + buf_size > s->allocated_bitstream_size){
buf= &s->bitstream[s->bitstream_index];
buf_size += s->bitstream_size;
s->bitstream_size= buf_size;
-
+
if(buf_size < s->max_framesize){
// printf("wanna more data ...\n");
return input_buf_size;
}
init_get_bits(&s->gb, buf, buf_size*8);
-
+
/* fLaC signature (be) */
if (show_bits_long(&s->gb, 32) == bswap_32(ff_get_fourcc("fLaC")))
{
metadata_last = get_bits(&s->gb, 1);
metadata_type = get_bits(&s->gb, 7);
metadata_size = get_bits_long(&s->gb, 24);
-
+
av_log(s->avctx, AV_LOG_DEBUG, " metadata block: flag = %d, type = %d, size = %d\n",
metadata_last, metadata_type,
metadata_size);
if(metadata_size){
switch(metadata_type)
{
- case METADATA_TYPE_STREAMINFO:
+ case METADATA_TYPE_STREAMINFO:{
metadata_streaminfo(s);
+
+ /* Buffer might have been reallocated, reinit bitreader */
+ if(buf != &s->bitstream[s->bitstream_index])
+ {
+ int bits_count = get_bits_count(&s->gb);
+ buf= &s->bitstream[s->bitstream_index];
+ init_get_bits(&s->gb, buf, buf_size*8);
+ skip_bits(&s->gb, bits_count);
+ }
+
dump_headers(s);
- break;
+ break;}
default:
for(i=0; i<metadata_size; i++)
skip_bits(&s->gb, 8);
}
else
{
-
+
tmp = show_bits(&s->gb, 16);
if(tmp != 0xFFF8){
av_log(s->avctx, AV_LOG_ERROR, "FRAME HEADER not here\n");
}
}
-
+
#if 0
/* fix the channel order here */
if (s->order == MID_SIDE)
for (j = 0; j < s->blocksize; j++)
{
for (i = 0; i < s->channels; i++)
- *(samples++) = s->decoded[i][j];
+ *(samples++) = shift_to_16_bits(s->decoded[i][j], s->bps);
}
break;
case LEFT_SIDE:
assert(s->channels == 2);
for (i = 0; i < s->blocksize; i++)
{
- *(samples++) = s->decoded[0][i];
- *(samples++) = s->decoded[0][i] - s->decoded[1][i];
+ *(samples++) = shift_to_16_bits(s->decoded[0][i], s->bps);
+ *(samples++) = shift_to_16_bits(s->decoded[0][i]
+ - s->decoded[1][i], s->bps);
}
break;
case RIGHT_SIDE:
assert(s->channels == 2);
for (i = 0; i < s->blocksize; i++)
{
- *(samples++) = s->decoded[0][i] + s->decoded[1][i];
- *(samples++) = s->decoded[1][i];
+ *(samples++) = shift_to_16_bits(s->decoded[0][i]
+ + s->decoded[1][i], s->bps);
+ *(samples++) = shift_to_16_bits(s->decoded[1][i], s->bps);
}
break;
case MID_SIDE:
#if 1 //needs to be checked but IMHO it should be binary identical
mid -= side>>1;
- *(samples++) = mid + side;
- *(samples++) = mid;
+ *(samples++) = shift_to_16_bits(mid + side, s->bps);
+ *(samples++) = shift_to_16_bits(mid, s->bps);
#else
-
+
mid <<= 1;
if (side & 1)
mid++;
s->bitstream_index += i;
s->bitstream_size -= i;
return input_buf_size;
- }else
+ }else
return i;
}
{
FLACContext *s = avctx->priv_data;
int i;
-
+
for (i = 0; i < s->channels; i++)
{
av_freep(&s->decoded[i]);
}
av_freep(&s->bitstream);
-
+
return 0;
}
+static void flac_flush(AVCodecContext *avctx){
+ FLACContext *s = avctx->priv_data;
+
+ s->bitstream_size=
+ s->bitstream_index= 0;
+}
+
AVCodec flac_decoder = {
"flac",
CODEC_TYPE_AUDIO,
NULL,
flac_decode_close,
flac_decode_frame,
+ .flush= flac_flush,
};
projects / ffmpeg / blobdiff