#include <limits.h>
#define ALT_BITSTREAM_READER
+#include "libavutil/crc.h"
#include "avcodec.h"
#include "bitstream.h"
#include "golomb.h"
-#include "crc.h"
+#include "flac.h"
#undef NDEBUG
#include <assert.h>
};
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;
+ int curr_bps;
enum decorrelation_type decorrelation;
int32_t *decoded[MAX_CHANNELS];
uint8_t *bitstream;
- int bitstream_size;
- int bitstream_index;
+ unsigned int bitstream_size;
+ unsigned int bitstream_index;
unsigned int allocated_bitstream_size;
} FLACContext;
#define METADATA_TYPE_STREAMINFO 0
-static int sample_rate_table[] =
+static const int sample_rate_table[] =
{ 0, 0, 0, 0,
8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
0, 0, 0, 0 };
-static int sample_size_table[] =
+static const int sample_size_table[] =
{ 0, 8, 12, 0, 16, 20, 24, 0 };
-static int blocksize_table[] = {
+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
};
return val;
}
-static void metadata_streaminfo(FLACContext *s);
static void allocate_buffers(FLACContext *s);
static int metadata_parse(FLACContext *s);
if (avctx->extradata_size > 4) {
/* initialize based on the demuxer-supplied streamdata header */
- init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
if (avctx->extradata_size == FLAC_STREAMINFO_SIZE) {
- metadata_streaminfo(s);
+ 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)
{
- av_log(s->avctx, AV_LOG_DEBUG, " Blocksize: %d .. %d (%d)\n", s->min_blocksize, s->max_blocksize, s->blocksize);
- av_log(s->avctx, AV_LOG_DEBUG, " Framesize: %d .. %d\n", s->min_framesize, s->max_framesize);
- av_log(s->avctx, AV_LOG_DEBUG, " Samplerate: %d\n", s->samplerate);
- av_log(s->avctx, AV_LOG_DEBUG, " Channels: %d\n", s->channels);
- av_log(s->avctx, AV_LOG_DEBUG, " 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 allocate_buffers(FLACContext *s){
s->decoded[i] = av_realloc(s->decoded[i], sizeof(int32_t)*s->max_blocksize);
}
- s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
+ if(s->allocated_bitstream_size < s->max_framesize)
+ s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
}
-static void metadata_streaminfo(FLACContext *s)
+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(&s->gb, 16);
- s->max_blocksize = get_bits(&s->gb, 16);
+ s->min_blocksize = get_bits(&gb, 16);
+ s->max_blocksize = get_bits(&gb, 16);
- s->min_framesize = get_bits_long(&s->gb, 24);
- s->max_framesize = get_bits_long(&s->gb, 24);
+ skip_bits(&gb, 24); /* skip min frame size */
+ s->max_framesize = get_bits_long(&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->samplerate = get_bits_long(&gb, 20);
+ s->channels = get_bits(&gb, 3) + 1;
+ s->bps = get_bits(&gb, 5) + 1;
- s->avctx->channels = s->channels;
- s->avctx->sample_rate = s->samplerate;
+ avctx->channels = s->channels;
+ avctx->sample_rate = s->samplerate;
- skip_bits(&s->gb, 36); /* total num of samples */
+ skip_bits(&gb, 36); /* total num of samples */
- skip_bits(&s->gb, 64); /* md5 sum */
- skip_bits(&s->gb, 64); /* md5 sum */
+ skip_bits(&gb, 64); /* md5 sum */
+ skip_bits(&gb, 64); /* md5 sum */
- dump_headers(s);
+ dump_headers(avctx, s);
}
/**
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);
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:
- metadata_streaminfo(s);
+ ff_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s, s->gb.buffer+get_bits_count(&s->gb)/8);
streaminfo_updated = 1;
- break;
default:
for (i=0; i<metadata_size; i++)
if (decode_residuals(s, channel, pred_order) < 0)
return -1;
- a = decoded[pred_order-1];
- b = a - decoded[pred_order-2];
- c = b - decoded[pred_order-2] + decoded[pred_order-3];
- d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
+ 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)
{
s->bps = bps;
s->decorrelation= decorrelation;
-// dump_headers(s);
+// dump_headers(s->avctx, (FLACStreaminfo *)s);
/* subframes */
for (i = 0; i < s->channels; i++)
}
if(1 && s->max_framesize){//FIXME truncated
- buf_size= FFMAX(FFMIN(buf_size, s->max_framesize - s->bitstream_size), 0);
+ 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;
+ 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);
buf_size += s->bitstream_size;
s->bitstream_size= buf_size;
- if(buf_size < s->max_framesize){
+ if(buf_size < s->max_framesize && input_buf_size){
// printf("wanna more data ...\n");
return input_buf_size;
}
init_get_bits(&s->gb, buf, buf_size*8);
- if (!metadata_parse(s))
- {
+ 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");
s->bitstream_index=0;
return -1;
}
- }
#if 0
NULL,
flac_decode_close,
flac_decode_frame,
+ CODEC_CAP_DELAY,
.flush= flac_flush,
- .long_name= "FLAC (Free Lossless Audio Codec)"
+ .long_name= NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
};
projects / ffmpeg / blobdiff