* FLAC (Free Lossless Audio Codec) decoder
* Copyright (c) 2003 Alex Beregszaszi
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* 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
+ * License along with FFmpeg; if not, write to the Free Software
+ * 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>
+
+#define ALT_BITSTREAM_READER
+#include "libavutil/crc.h"
#include "avcodec.h"
+#include "bitstream.h"
#include "golomb.h"
+#include "flac.h"
+
+#undef NDEBUG
+#include <assert.h>
#define MAX_CHANNELS 8
#define MAX_BLOCKSIZE 65535
+#define FLAC_STREAMINFO_SIZE 34
-enum channel_order {
+enum decorrelation_type {
INDEPENDENT,
LEFT_SIDE,
RIGHT_SIDE,
};
typedef struct FLACContext {
+ FLACSTREAMINFO
+
AVCodecContext *avctx;
GetBitContext gb;
- int min_blocksize, max_blocksize;
- int min_framesize, max_framesize;
- int samplerate, channels;
- int blocksize, last_blocksize;
- int bps, curr_bps;
- enum channel_order order;
+ int blocksize/*, last_blocksize*/;
+ int curr_bps;
+ enum decorrelation_type decorrelation;
- uint8_t *residual[MAX_CHANNELS];
- uint32_t *decoded[MAX_CHANNELS];
+ int32_t *decoded[MAX_CHANNELS];
+ uint8_t *bitstream;
+ unsigned int bitstream_size;
+ unsigned int bitstream_index;
+ unsigned int allocated_bitstream_size;
} FLACContext;
#define METADATA_TYPE_STREAMINFO 0
-static int sample_rate_table[] =
-{ 0, 0, 0, 0,
+static const int sample_rate_table[] =
+{ 0,
+ 88200, 176400, 192000,
8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
- 0, 0, 0, 0 };
+ 0, 0, 0, 0 };
-static int sample_size_table[] =
+static const int sample_size_table[] =
{ 0, 8, 12, 0, 16, 20, 24, 0 };
-static uint64_t get_uvlc(GetBitContext *gb, int is64)
-{
- uint64_t val = 0;
- int i = 0;
+static const 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
+};
- while(i++ < 5+is64)
- {
- const int tmp = get_bits(gb, 8);
-
- if (tmp & 0x80)
- val = (val << 7) + tmp - 0x80;
- else
- return (val << 7) + tmp;
- }
- return -1;
+static int64_t get_utf8(GetBitContext *gb){
+ int64_t val;
+ GET_UTF8(val, get_bits(gb, 8), return -1;)
+ return val;
}
-static int flac_decode_init(AVCodecContext * avctx)
+static void allocate_buffers(FLACContext *s);
+static int metadata_parse(FLACContext *s);
+
+static av_cold int flac_decode_init(AVCodecContext * avctx)
{
+ FLACContext *s = avctx->priv_data;
+ s->avctx = avctx;
+
+ if (avctx->extradata_size > 4) {
+ /* initialize based on the demuxer-supplied streamdata header */
+ if (avctx->extradata_size == FLAC_STREAMINFO_SIZE) {
+ ff_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, avctx->extradata);
+ allocate_buffers(s);
+ } else {
+ init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
+ metadata_parse(s);
+ }
+ }
+
+ avctx->sample_fmt = SAMPLE_FMT_S16;
return 0;
}
-static void dump_headers(FLACContext *s)
+static void dump_headers(AVCodecContext *avctx, FLACStreaminfo *s)
{
- printf(" Blocksize: %d .. %d (%d)\n", s->min_blocksize, s->max_blocksize, s->blocksize);
- printf(" Framesize: %d .. %d\n", s->min_framesize, s->max_framesize);
- printf(" Samplerate: %d\n", s->samplerate);
- printf(" Channels: %d\n", s->channels);
- printf(" Bits: %d\n", s->bps);
+ av_log(avctx, AV_LOG_DEBUG, " Blocksize: %d .. %d\n", s->min_blocksize, s->max_blocksize);
+ av_log(avctx, AV_LOG_DEBUG, " Max Framesize: %d\n", s->max_framesize);
+ av_log(avctx, AV_LOG_DEBUG, " Samplerate: %d\n", s->samplerate);
+ av_log(avctx, AV_LOG_DEBUG, " Channels: %d\n", s->channels);
+ av_log(avctx, AV_LOG_DEBUG, " Bits: %d\n", s->bps);
}
-static void metadata_streaminfo(FLACContext *s)
-{
+static void allocate_buffers(FLACContext *s){
int i;
- /* mandatory streaminfo */
- s->min_blocksize = get_bits(&s->gb, 16);
- s->max_blocksize = get_bits(&s->gb, 16);
-
- 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 */
+ assert(s->max_blocksize);
+
+ if(s->max_framesize == 0 && s->max_blocksize){
+ s->max_framesize= (s->channels * s->bps * s->max_blocksize + 7)/ 8; //FIXME header overhead
+ }
for (i = 0; i < s->channels; i++)
{
- s->decoded[i] = av_realloc(s->decoded[i], sizeof(uint32_t)*s->max_blocksize);
- s->residual[i] = av_realloc(s->residual[i], sizeof(uint8_t)*s->max_blocksize);
+ s->decoded[i] = av_realloc(s->decoded[i], sizeof(int32_t)*s->max_blocksize);
+ }
+
+ if(s->allocated_bitstream_size < s->max_framesize)
+ s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
+}
+
+void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
+ const uint8_t *buffer)
+{
+ GetBitContext gb;
+ init_get_bits(&gb, buffer, FLAC_STREAMINFO_SIZE*8);
+
+ /* mandatory streaminfo */
+ s->min_blocksize = get_bits(&gb, 16);
+ s->max_blocksize = get_bits(&gb, 16);
+
+ skip_bits(&gb, 24); /* skip min frame size */
+ s->max_framesize = get_bits_long(&gb, 24);
+
+ s->samplerate = get_bits_long(&gb, 20);
+ s->channels = get_bits(&gb, 3) + 1;
+ s->bps = get_bits(&gb, 5) + 1;
+
+ avctx->channels = s->channels;
+ avctx->sample_rate = s->samplerate;
+
+ skip_bits(&gb, 36); /* total num of samples */
+
+ skip_bits(&gb, 64); /* md5 sum */
+ skip_bits(&gb, 64); /* md5 sum */
+
+ dump_headers(avctx, s);
+}
+
+/**
+ * Parse a list of metadata blocks. This list of blocks must begin with
+ * the fLaC marker.
+ * @param s the flac decoding context containing the gb bit reader used to
+ * parse metadata
+ * @return 1 if some metadata was read, 0 if no fLaC marker was found
+ */
+static int metadata_parse(FLACContext *s)
+{
+ int i, metadata_last, metadata_type, metadata_size, streaminfo_updated=0;
+ int initial_pos= get_bits_count(&s->gb);
+
+ if (show_bits_long(&s->gb, 32) == MKBETAG('f','L','a','C')) {
+ skip_bits(&s->gb, 32);
+
+ av_log(s->avctx, AV_LOG_DEBUG, "STREAM HEADER\n");
+ do {
+ metadata_last = get_bits1(&s->gb);
+ metadata_type = get_bits(&s->gb, 7);
+ metadata_size = get_bits_long(&s->gb, 24);
+
+ if(get_bits_count(&s->gb) + 8*metadata_size > s->gb.size_in_bits){
+ skip_bits_long(&s->gb, initial_pos - get_bits_count(&s->gb));
+ break;
+ }
+
+ 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:
+ ff_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s, s->gb.buffer+get_bits_count(&s->gb)/8);
+ streaminfo_updated = 1;
+
+ default:
+ for (i=0; i<metadata_size; i++)
+ skip_bits(&s->gb, 8);
+ }
+ }
+ } while (!metadata_last);
+
+ if (streaminfo_updated)
+ allocate_buffers(s);
+ return 1;
}
+ return 0;
}
static int decode_residuals(FLACContext *s, int channel, int pred_order)
int sample = 0, samples;
method_type = get_bits(&s->gb, 2);
- if (method_type != 0)
+ if (method_type > 1){
+ 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 = (rice_order > 0) ?
- (s->blocksize >> rice_order) : (s->blocksize - pred_order);
+ samples= s->blocksize >> rice_order;
+ if (pred_order > samples) {
+ av_log(s->avctx, AV_LOG_ERROR, "invalid predictor order: %i > %i\n", pred_order, samples);
+ return -1;
+ }
+ sample=
+ i= pred_order;
for (partition = 0; partition < (1 << rice_order); partition++)
{
- tmp = get_bits(&s->gb, 4);
- if (tmp == 0)
- {
- i = (!rice_order || partition) ? 0 : pred_order;
- for (; i < samples; i++, sample++)
- s->residual[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, 0, 0);
- printf("zero k\n");
- }
- else if (tmp == 15)
+ tmp = get_bits(&s->gb, method_type == 0 ? 4 : 5);
+ if (tmp == (method_type == 0 ? 15 : 31))
{
- printf("fixed len partition\n");
+ av_log(s->avctx, AV_LOG_DEBUG, "fixed len partition\n");
tmp = get_bits(&s->gb, 5);
- i = (!rice_order || partition) ? 0 : pred_order;
for (; i < samples; i++, sample++)
- s->residual[channel][sample] = get_bits(&s->gb, tmp);
+ s->decoded[channel][sample] = get_sbits(&s->gb, tmp);
}
else
{
-// printf("rice coded partition\n");
-#if 1
- i = (!rice_order || partition) ? 0 : pred_order;
- for (; i < samples; i++, sample++)
- s->residual[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, 0, 0);
-#else
- i = ((!rice_order || partition) ? samples : samples - pred_order) + sample;
- for (; sample < i; sample++)
- s->residual[channel][sample] = get_ur_golomb(&s->gb, tmp, 0, 0);
-// s->residual[channel][sample] = get_se_golomb(&s->gb);
-#endif
+// 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);
+ }
}
+ i= 0;
}
- printf("partitions: %d, samples: %d\n", 1 << rice_order, sample);
+// 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;
-
- printf(" SUBFRAME FIXED\n");
-
+ const int blocksize = s->blocksize;
+ int32_t *decoded = s->decoded[channel];
+ int a, b, c, d, i;
+
+// av_log(s->avctx, AV_LOG_DEBUG, " SUBFRAME FIXED\n");
+
/* warm up samples */
- printf(" 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++)
{
- s->decoded[channel][i] = get_bits(&s->gb, s->curr_bps);
- printf(" %d: %d\n", i, s->decoded[channel][i]);
+ decoded[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;
+ if(pred_order > 0)
+ a = decoded[pred_order-1];
+ if(pred_order > 1)
+ b = a - decoded[pred_order-2];
+ if(pred_order > 2)
+ c = b - decoded[pred_order-2] + decoded[pred_order-3];
+ if(pred_order > 3)
+ d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
+
switch(pred_order)
{
case 0:
- for (i = pred_order; i < s->blocksize; i++)
- s->decoded[channel][i] = s->residual[channel][i];
break;
case 1:
- for (i = pred_order; i < s->blocksize; i++)
- s->decoded[channel][i] = s->residual[channel][i] +
- s->decoded[channel][i-1];
+ for (i = pred_order; i < blocksize; i++)
+ decoded[i] = a += decoded[i];
break;
case 2:
- for (i = pred_order; i < s->blocksize; i++)
- s->decoded[channel][i] = s->residual[channel][i] +
- (s->decoded[channel][i-1] << 1) -
- s->decoded[channel][i-2];
+ for (i = pred_order; i < blocksize; i++)
+ decoded[i] = a += b += decoded[i];
break;
case 3:
- for (i = pred_order; i < s->blocksize; i++)
- s->decoded[channel][i] = s->residual[channel][i] +
- (((s->decoded[channel][i-1] -
- s->decoded[channel][i-2]) << 1) +
- (s->decoded[channel][i-1] -
- s->decoded[channel][i-2])) +
- s->decoded[channel][i-3];
+ for (i = pred_order; i < blocksize; i++)
+ decoded[i] = a += b += c += decoded[i];
break;
case 4:
- for (i = pred_order; i < s->blocksize; i++)
- s->decoded[channel][i] = s->residual[channel][i] +
- ((s->decoded[channel][i-1] +
- s->decoded[channel][i-3]) << 2) -
- ((s->decoded[channel][i-2] << 2) +
- (s->decoded[channel][i-2] << 1)) -
- s->decoded[channel][i-4];
+ for (i = pred_order; i < blocksize; i++)
+ decoded[i] = a += b += c += d += decoded[i];
break;
+ default:
+ av_log(s->avctx, AV_LOG_ERROR, "illegal pred order %d\n", pred_order);
+ return -1;
}
-
+
return 0;
}
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];
-
- printf(" SUBFRAME LPC\n");
-
+ int32_t *decoded = s->decoded[channel];
+
+// av_log(s->avctx, AV_LOG_DEBUG, " SUBFRAME LPC\n");
+
/* warm up samples */
- printf(" 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++)
{
- s->decoded[channel][i] = get_bits(&s->gb, s->curr_bps);
- printf(" %d: %d\n", i, s->decoded[channel][i]);
+ decoded[i] = get_sbits(&s->gb, s->curr_bps);
+// av_log(s->avctx, AV_LOG_DEBUG, " %d: %d\n", i, decoded[i]);
}
-
+
coeff_prec = get_bits(&s->gb, 4) + 1;
if (coeff_prec == 16)
{
- printf("invalid coeff precision\n");
+ av_log(s->avctx, AV_LOG_DEBUG, "invalid coeff precision\n");
+ return -1;
+ }
+// av_log(s->avctx, AV_LOG_DEBUG, " qlp coeff prec: %d\n", coeff_prec);
+ qlevel = get_sbits(&s->gb, 5);
+// av_log(s->avctx, AV_LOG_DEBUG, " quant level: %d\n", qlevel);
+ if(qlevel < 0){
+ av_log(s->avctx, AV_LOG_DEBUG, "qlevel %d not supported, maybe buggy stream\n", qlevel);
return -1;
}
- printf(" qlp coeff prec: %d\n", coeff_prec);
- qlevel = get_bits(&s->gb, 5);
- printf(" quant level: %d\n", qlevel);
-
+
for (i = 0; i < pred_order; i++)
{
- coeffs[i] = get_bits(&s->gb, coeff_prec);
- printf(" %d: %d\n", i, coeffs[i]);
+ 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] = s->residual[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] * decoded[i-j-1];
+ decoded[i] += sum >> qlevel;
+ }
+ } else {
+ for (i = pred_order; i < s->blocksize-1; i += 2)
+ {
+ int c;
+ int d = decoded[i-pred_order];
+ int s0 = 0, s1 = 0;
+ for (j = pred_order-1; j > 0; j--)
+ {
+ c = coeffs[j];
+ s0 += c*d;
+ d = decoded[i-j];
+ s1 += c*d;
+ }
+ c = coeffs[0];
+ s0 += c*d;
+ d = decoded[i] += s0 >> qlevel;
+ s1 += c*d;
+ decoded[i+1] += s1 >> qlevel;
+ }
+ if (i < s->blocksize)
+ {
+ int sum = 0;
+ for (j = 0; j < pred_order; j++)
+ sum += coeffs[j] * decoded[i-j-1];
+ decoded[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)
+ s->curr_bps++;
+ }else{
+ if(s->decorrelation == LEFT_SIDE || s->decorrelation == MID_SIDE)
+ s->curr_bps++;
+ }
+
if (get_bits1(&s->gb))
{
- printf("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))
// wasted++;
// s->curr_bps -= wasted;
// }
-
+#if 0
+ wasted= 16 - av_log2(show_bits(&s->gb, 17));
+ skip_bits(&s->gb, wasted+1);
+ s->curr_bps -= wasted;
+#else
if (get_bits1(&s->gb))
{
wasted = 1;
while (!get_bits1(&s->gb))
wasted++;
s->curr_bps -= wasted;
+ av_log(s->avctx, AV_LOG_DEBUG, "%d wasted bits\n", wasted);
}
-
+#endif
+//FIXME use av_log2 for types
if (type == 0)
{
- printf("coding type: constant\n");
- tmp = get_bits(&s->gb, s->curr_bps);
+ av_log(s->avctx, AV_LOG_DEBUG, "coding type: constant\n");
+ tmp = get_sbits(&s->gb, s->curr_bps);
for (i = 0; i < s->blocksize; i++)
s->decoded[channel][i] = tmp;
}
else if (type == 1)
{
- printf("coding type: verbatim\n");
+ av_log(s->avctx, AV_LOG_DEBUG, "coding type: verbatim\n");
for (i = 0; i < s->blocksize; i++)
- s->decoded[channel][i] = get_bits(&s->gb, s->curr_bps);
+ s->decoded[channel][i] = get_sbits(&s->gb, s->curr_bps);
}
else if ((type >= 8) && (type <= 12))
{
- printf("coding type: fixed\n");
+// av_log(s->avctx, AV_LOG_DEBUG, "coding type: fixed\n");
if (decode_subframe_fixed(s, channel, type & ~0x8) < 0)
return -1;
}
else if (type >= 32)
{
- printf("coding type: lpc\n");
+// av_log(s->avctx, AV_LOG_DEBUG, "coding type: lpc\n");
if (decode_subframe_lpc(s, channel, (type & ~0x20)+1) < 0)
return -1;
}
else
{
- printf("invalid coding type\n");
+ av_log(s->avctx, AV_LOG_ERROR, "invalid coding type\n");
return -1;
}
-
+
if (wasted)
{
int i;
return 0;
}
-static int decode_frame(FLACContext *s)
+static int decode_frame(FLACContext *s, int alloc_data_size)
{
- int blocksize_code, sample_rate_code, sample_size_code, assignment, i;
-
+ int blocksize_code, sample_rate_code, sample_size_code, assignment, i, crc8;
+ int decorrelation, bps, blocksize, samplerate;
+
blocksize_code = get_bits(&s->gb, 4);
- 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);
- else if (blocksize_code >= 8)
- s->blocksize = 256 << (blocksize_code - 8);
sample_rate_code = get_bits(&s->gb, 4);
- if ((sample_rate_code > 3) && (sample_rate_code < 12))
- s->samplerate = sample_rate_table[sample_rate_code];
-
+
assignment = get_bits(&s->gb, 4); /* channel assignment */
- if (assignment < 8)
- {
- s->order = INDEPENDENT;
- if (s->channels != assignment+1)
- printf("channel number and number of assigned channels differ!\n");
- printf("channels: %d\n", assignment+1);
- }
- else if (assignment == 8)
- {
- s->order = LEFT_SIDE;
- printf("left/side\n");
- }
- else if (assignment == 9)
- {
- s->order = RIGHT_SIDE;
- printf("right/side\n");
- }
- else if (assignment == 10)
- {
- s->order = MID_SIDE;
- printf("mid/side\n");
- }
+ if (assignment < 8 && s->channels == assignment+1)
+ decorrelation = INDEPENDENT;
+ else if (assignment >=8 && assignment < 11 && s->channels == 2)
+ decorrelation = LEFT_SIDE + assignment - 8;
else
{
- printf("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 (s->bps != 0)
- s->bps = sample_size_table[sample_size_code];
- if ((sample_size_code == 3) || (sample_size_code == 7))
+ if (get_bits1(&s->gb))
{
- printf("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))
- {
- printf("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 (((blocksize_code == 6) || (blocksize_code == 7)) &&
- (s->min_blocksize != s->max_blocksize))
- {
- get_uvlc(&s->gb, 1);
+#if 0
+ if (/*((blocksize_code == 6) || (blocksize_code == 7)) &&*/
+ (s->min_blocksize != s->max_blocksize)){
+ }else{
}
+#endif
+
+ if (blocksize_code == 0)
+ blocksize = s->min_blocksize;
+ else if (blocksize_code == 6)
+ blocksize = get_bits(&s->gb, 8)+1;
+ else if (blocksize_code == 7)
+ blocksize = get_bits(&s->gb, 16)+1;
else
- get_uvlc(&s->gb, 0);
-
- if (blocksize_code == 6)
- s->blocksize = get_bits(&s->gb, 8)+1;
- if (blocksize_code == 7)
- s->blocksize = get_bits(&s->gb, 16)+1;
-
- if ((sample_rate_code > 11) && (sample_rate_code < 15))
- {
- switch(sample_rate_code)
- {
- case 12:
- s->samplerate = get_bits(&s->gb, 8) * 1000;
- break;
- case 13:
- s->samplerate = get_bits(&s->gb, 16);
- break;
- case 14:
- s->samplerate = get_bits(&s->gb, 16) * 10;
- break;
- }
+ blocksize = blocksize_table[blocksize_code];
+
+ if(blocksize > s->max_blocksize){
+ av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", blocksize, s->max_blocksize);
+ return -1;
+ }
+
+ if(blocksize * s->channels * sizeof(int16_t) > alloc_data_size)
+ return -1;
+
+ if (sample_rate_code == 0){
+ samplerate= s->samplerate;
+ }else if (sample_rate_code < 12)
+ samplerate = sample_rate_table[sample_rate_code];
+ else if (sample_rate_code == 12)
+ samplerate = get_bits(&s->gb, 8) * 1000;
+ else if (sample_rate_code == 13)
+ samplerate = get_bits(&s->gb, 16);
+ else if (sample_rate_code == 14)
+ 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 = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0,
+ s->gb.buffer, get_bits_count(&s->gb)/8);
+ if(crc8){
+ av_log(s->avctx, AV_LOG_ERROR, "header crc mismatch crc=%2X\n", crc8);
+ return -1;
}
- skip_bits(&s->gb, 8); /* header crc */
+ s->blocksize = blocksize;
+ s->samplerate = samplerate;
+ s->bps = bps;
+ s->decorrelation= decorrelation;
- dump_headers(s);
+// dump_headers(s->avctx, (FLACStreaminfo *)s);
/* subframes */
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);
- s->residual[i] = av_realloc(s->residual[i], sizeof(uint8_t)*s->blocksize);
- }
- printf("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)
return -1;
}
-
+
align_get_bits(&s->gb);
/* frame footer */
static int flac_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ const uint8_t *buf, int buf_size)
{
FLACContext *s = avctx->priv_data;
- int metadata_flag, metadata_type, metadata_size;
- int tmp = 0, i, j = 0;
- int16_t *samples = data, *left, *right;
+ int tmp = 0, i, j = 0, input_buf_size = 0;
+ int16_t *samples = data;
+ int alloc_data_size= *data_size;
- *data_size = 0;
+ *data_size=0;
- s->avctx = avctx;
+ if(s->max_framesize == 0){
+ s->max_framesize= FFMAX(4, buf_size); // should hopefully be enough for the first header
+ s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
+ }
- init_get_bits(&s->gb, buf, buf_size*8);
-
- /* fLaC signature (be) */
- if (get_bits_long(&s->gb, 32) == bswap_32(ff_get_fourcc("fLaC")))
- {
- printf("STREAM HEADER\n");
- do {
- metadata_flag = get_bits(&s->gb, 1);
- metadata_type = get_bits(&s->gb, 7);
- metadata_size = get_bits_long(&s->gb, 24);
-
- printf(" metadata block: flag = %d, type = %d, size = %d\n",
- metadata_flag, metadata_type,
- metadata_size);
+ if(1 && s->max_framesize){//FIXME truncated
+ if(s->bitstream_size < 4 || AV_RL32(s->bitstream) != MKTAG('f','L','a','C'))
+ buf_size= FFMIN(buf_size, s->max_framesize - FFMIN(s->bitstream_size, s->max_framesize));
+ input_buf_size= buf_size;
- switch(metadata_type)
- {
- case METADATA_TYPE_STREAMINFO:
- metadata_streaminfo(s);
- dump_headers(s);
- break;
- default:
- while ((metadata_size -= 8) > 0)
- skip_bits(&s->gb, 8);
+ if(s->bitstream_size + buf_size < buf_size || s->bitstream_index + s->bitstream_size + buf_size < s->bitstream_index)
+ return -1;
+
+ if(s->allocated_bitstream_size < s->bitstream_size + buf_size)
+ s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->bitstream_size + buf_size);
+
+ if(s->bitstream_index + s->bitstream_size + buf_size > s->allocated_bitstream_size){
+// printf("memmove\n");
+ memmove(s->bitstream, &s->bitstream[s->bitstream_index], s->bitstream_size);
+ s->bitstream_index=0;
+ }
+ memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], buf, buf_size);
+ buf= &s->bitstream[s->bitstream_index];
+ buf_size += s->bitstream_size;
+ s->bitstream_size= buf_size;
+
+ if(buf_size < s->max_framesize && input_buf_size){
+// printf("wanna more data ...\n");
+ return input_buf_size;
}
- } while(metadata_flag != 1);
}
- else
- {
- init_get_bits(&s->gb, buf, buf_size*8);
- tmp = get_bits(&s->gb, 16);
- if (tmp == 0xfff8)
- printf("FRAME HEADER\n");
- if (decode_frame(s) < 0)
+ init_get_bits(&s->gb, buf, buf_size*8);
+
+ if(metadata_parse(s))
+ goto end;
+
+ tmp = show_bits(&s->gb, 16);
+ if((tmp & 0xFFFE) != 0xFFF8){
+ 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) & 0xFFFE) != 0xFFF8)
+ skip_bits(&s->gb, 8);
+ goto end; // we may not have enough bits left to decode a frame, so try next time
+ }
+ skip_bits(&s->gb, 16);
+ if (decode_frame(s, alloc_data_size) < 0){
+ av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
+ s->bitstream_size=0;
+ s->bitstream_index=0;
return -1;
- }
-
+ }
+
+
#if 0
/* fix the channel order here */
if (s->order == MID_SIDE)
samples[(s->blocksize*i)+j] = s->decoded[0][j] - s->decoded[i][j];
break;
// case MID_SIDE:
-// printf("mid-side unsupported\n");
+// av_log(s->avctx, AV_LOG_DEBUG, "mid-side unsupported\n");
}
*data_size += s->blocksize;
}
}
#else
- switch(s->order)
+#define DECORRELATE(left, right)\
+ assert(s->channels == 2);\
+ for (i = 0; i < s->blocksize; i++)\
+ {\
+ int a= s->decoded[0][i];\
+ int b= s->decoded[1][i];\
+ *samples++ = ((left) << (24 - s->bps)) >> 8;\
+ *samples++ = ((right) << (24 - s->bps)) >> 8;\
+ }\
+ break;
+
+ switch(s->decorrelation)
{
case INDEPENDENT:
- for (i = 0; i < s->channels; i++)
+ for (j = 0; j < s->blocksize; j++)
{
- for (j = 0; j < s->blocksize; j++)
- *(samples++) = s->decoded[i][j];
- *data_size += s->blocksize;
+ for (i = 0; i < s->channels; i++)
+ *samples++ = (s->decoded[i][j] << (24 - s->bps)) >> 8;
}
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];
- }
- *data_size = 2*s->blocksize;
- break;
+ DECORRELATE(a,a-b)
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];
- }
- *data_size = 2*s->blocksize;
- break;
+ DECORRELATE(a+b,b)
case MID_SIDE:
- assert(s->channels == 2);
- for (i = 0; i < s->blocksize; i++)
- {
- int16_t mid, side;
- mid = s->decoded[0][i];
- side = s->decoded[1][i];
-
- mid <<= 1;
- if (side & 1)
- mid++;
- *(samples++) = (mid + side) >> 1;
- *(samples++) = (mid - side) >> 1;
- }
- *data_size = 2*s->blocksize;
- break;
+ DECORRELATE( (a-=b>>1) + b, a)
}
#endif
-// *data_size = (int8_t *)samples - (int8_t *)data;
- printf("data size: %d\n", *data_size);
+ *data_size = (int8_t *)samples - (int8_t *)data;
+// av_log(s->avctx, AV_LOG_DEBUG, "data size: %d\n", *data_size);
- s->last_blocksize = s->blocksize;
+// s->last_blocksize = s->blocksize;
+end:
+ i= (get_bits_count(&s->gb)+7)/8;
+ if(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 (get_bits_count(&s->gb)+7)/8;
+ if(s->bitstream_size){
+ s->bitstream_index += i;
+ s->bitstream_size -= i;
+ return input_buf_size;
+ }else
+ return i;
}
-static int flac_decode_close(AVCodecContext *avctx)
+static av_cold int flac_decode_close(AVCodecContext *avctx)
{
FLACContext *s = avctx->priv_data;
int i;
-
+
for (i = 0; i < s->channels; i++)
{
- if (s->decoded[i])
- av_free(s->decoded[i]);
- if (s->residual[i])
- av_free(s->residual[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,
+ CODEC_CAP_DELAY,
+ .flush= flac_flush,
+ .long_name= NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
};
projects / ffmpeg / blobdiff