*/
/**
- * @file libavcodec/flacdec.c
+ * @file
* FLAC (Free Lossless Audio Codec) decoder
* @author Alex Beregszaszi
*
#include "libavutil/crc.h"
#include "avcodec.h"
#include "internal.h"
-#include "bitstream.h"
+#include "get_bits.h"
#include "bytestream.h"
#include "golomb.h"
#include "flac.h"
+#include "flacdata.h"
#undef NDEBUG
#include <assert.h>
-#define MAX_CHANNELS 8
-#define MAX_BLOCKSIZE 65535
-
-enum decorrelation_type {
- INDEPENDENT,
- LEFT_SIDE,
- RIGHT_SIDE,
- MID_SIDE,
-};
-
typedef struct FLACContext {
FLACSTREAMINFO
int curr_bps; ///< bps for current subframe, adjusted for channel correlation and wasted bits
int sample_shift; ///< shift required to make output samples 16-bit or 32-bit
int is32; ///< flag to indicate if output should be 32-bit instead of 16-bit
- enum decorrelation_type decorrelation; ///< channel decorrelation type in the current frame
+ int ch_mode; ///< channel decorrelation type in the current frame
int got_streaminfo; ///< indicates if the STREAMINFO has been read
- int32_t *decoded[MAX_CHANNELS]; ///< decoded samples
- uint8_t *bitstream;
- unsigned int bitstream_size;
- unsigned int bitstream_index;
- unsigned int allocated_bitstream_size;
+ int32_t *decoded[FLAC_MAX_CHANNELS]; ///< decoded samples
} FLACContext;
-static const int sample_rate_table[] =
-{ 0,
- 88200, 176400, 192000,
- 8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
- 0, 0, 0, 0 };
-
-static const int sample_size_table[] =
-{ 0, 8, 12, 0, 16, 20, 24, 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
-};
-
-static int64_t get_utf8(GetBitContext *gb)
-{
- int64_t val;
- GET_UTF8(val, get_bits(gb, 8), return -1;)
- return val;
-}
-
static void allocate_buffers(FLACContext *s);
int ff_flac_is_extradata_valid(AVCodecContext *avctx,
FLACContext *s = avctx->priv_data;
s->avctx = avctx;
- avctx->sample_fmt = SAMPLE_FMT_S16;
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
/* for now, the raw FLAC header is allowed to be passed to the decoder as
frame data instead of extradata. */
/* initialize based on the demuxer-supplied streamdata header */
ff_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, streaminfo);
+ if (s->bps > 16)
+ avctx->sample_fmt = AV_SAMPLE_FMT_S32;
+ else
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
allocate_buffers(s);
s->got_streaminfo = 1;
assert(s->max_blocksize);
- if (s->max_framesize == 0 && s->max_blocksize) {
- // FIXME header overhead
- s->max_framesize= (s->channels * s->bps * s->max_blocksize + 7)/ 8;
- }
-
for (i = 0; i < s->channels; i++) {
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,
skip_bits(&gb, 16); /* skip min blocksize */
s->max_blocksize = get_bits(&gb, 16);
- if (s->max_blocksize < 16) {
+ if (s->max_blocksize < FLAC_MIN_BLOCKSIZE) {
av_log(avctx, AV_LOG_WARNING, "invalid max blocksize: %d\n",
s->max_blocksize);
s->max_blocksize = 16;
avctx->channels = s->channels;
avctx->sample_rate = s->samplerate;
avctx->bits_per_raw_sample = s->bps;
- if (s->bps > 16)
- avctx->sample_fmt = SAMPLE_FMT_S32;
- else
- avctx->sample_fmt = SAMPLE_FMT_S16;
s->samples = get_bits_long(&gb, 32) << 4;
s->samples |= get_bits(&gb, 4);
dump_headers(avctx, s);
}
+void ff_flac_parse_block_header(const uint8_t *block_header,
+ int *last, int *type, int *size)
+{
+ int tmp = bytestream_get_byte(&block_header);
+ if (last)
+ *last = tmp & 0x80;
+ if (type)
+ *type = tmp & 0x7F;
+ if (size)
+ *size = bytestream_get_be24(&block_header);
+}
+
/**
* Parse the STREAMINFO from an inline header.
* @param s the flac decoding context
/* need more data */
return 0;
}
- buf += 4;
- metadata_type = bytestream_get_byte(&buf) & 0x7F;
- metadata_size = bytestream_get_be24(&buf);
+ ff_flac_parse_block_header(&buf[4], NULL, &metadata_type, &metadata_size);
if (metadata_type != FLAC_METADATA_TYPE_STREAMINFO ||
metadata_size != FLAC_STREAMINFO_SIZE) {
return AVERROR_INVALIDDATA;
}
- ff_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s, buf);
+ ff_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s, &buf[8]);
allocate_buffers(s);
s->got_streaminfo = 1;
buf += 4;
do {
- metadata_last = bytestream_get_byte(&buf) & 0x80;
- metadata_size = bytestream_get_be24(&buf);
+ ff_flac_parse_block_header(buf, &metadata_last, NULL, &metadata_size);
+ buf += 4;
if (buf + metadata_size > buf_end) {
/* need more data in order to read the complete header */
return 0;
{
int i, j;
int coeff_prec, qlevel;
- int coeffs[pred_order];
+ int coeffs[32];
int32_t *decoded = s->decoded[channel];
/* warm up samples */
s->curr_bps = s->bps;
if (channel == 0) {
- if (s->decorrelation == RIGHT_SIDE)
+ if (s->ch_mode == FLAC_CHMODE_RIGHT_SIDE)
s->curr_bps++;
} else {
- if (s->decorrelation == LEFT_SIDE || s->decorrelation == MID_SIDE)
+ if (s->ch_mode == FLAC_CHMODE_LEFT_SIDE || s->ch_mode == FLAC_CHMODE_MID_SIDE)
s->curr_bps++;
}
s->curr_bps -= wasted;
}
if (s->curr_bps > 32) {
- ff_log_missing_feature(s->avctx, "decorrelated bit depth > 32", 0);
+ av_log_missing_feature(s->avctx, "decorrelated bit depth > 32", 0);
return -1;
}
return 0;
}
-static int decode_frame(FLACContext *s, int alloc_data_size)
+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);
+ int i;
+ GetBitContext *gb = &s->gb;
+ FLACFrameInfo fi;
- assignment = get_bits(&s->gb, 4); /* channel assignment */
- 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_ERROR, "unsupported channel assignment %d (channels=%d)\n",
- assignment, s->channels);
+ if (ff_flac_decode_frame_header(s->avctx, gb, &fi, 0)) {
+ av_log(s->avctx, AV_LOG_ERROR, "invalid frame header\n");
return -1;
}
- 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);
+ if (s->channels && fi.channels != s->channels) {
+ av_log(s->avctx, AV_LOG_ERROR, "switching channel layout mid-stream "
+ "is not supported\n");
return -1;
}
- if (bps > 16) {
- s->avctx->sample_fmt = SAMPLE_FMT_S32;
- s->sample_shift = 32 - bps;
- s->is32 = 1;
- } else {
- s->avctx->sample_fmt = SAMPLE_FMT_S16;
- s->sample_shift = 16 - bps;
- s->is32 = 0;
- }
- s->bps = s->avctx->bits_per_raw_sample = bps;
+ s->channels = s->avctx->channels = fi.channels;
+ s->ch_mode = fi.ch_mode;
- if (get_bits1(&s->gb)) {
- av_log(s->avctx, AV_LOG_ERROR, "broken stream, invalid padding\n");
+ if (!s->bps && !fi.bps) {
+ av_log(s->avctx, AV_LOG_ERROR, "bps not found in STREAMINFO or frame header\n");
return -1;
}
-
- if (get_utf8(&s->gb) < 0) {
- av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
+ if (!fi.bps) {
+ fi.bps = s->bps;
+ } else if (s->bps && fi.bps != s->bps) {
+ av_log(s->avctx, AV_LOG_ERROR, "switching bps mid-stream is not "
+ "supported\n");
return -1;
}
+ s->bps = s->avctx->bits_per_raw_sample = fi.bps;
- if (blocksize_code == 0) {
- av_log(s->avctx, AV_LOG_ERROR, "reserved blocksize code: 0\n");
- return -1;
- } 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
- blocksize = blocksize_table[blocksize_code];
+ if (s->bps > 16) {
+ s->avctx->sample_fmt = AV_SAMPLE_FMT_S32;
+ s->sample_shift = 32 - s->bps;
+ s->is32 = 1;
+ } else {
+ s->avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+ s->sample_shift = 16 - s->bps;
+ s->is32 = 0;
+ }
- if (blocksize > s->max_blocksize) {
- av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", blocksize,
+ if (!s->max_blocksize)
+ s->max_blocksize = FLAC_MAX_BLOCKSIZE;
+ if (fi.blocksize > s->max_blocksize) {
+ av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", fi.blocksize,
s->max_blocksize);
return -1;
}
+ s->blocksize = fi.blocksize;
- if (blocksize * s->channels * (s->is32 ? 4 : 2) > 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);
+ if (!s->samplerate && !fi.samplerate) {
+ av_log(s->avctx, AV_LOG_ERROR, "sample rate not found in STREAMINFO"
+ " or frame header\n");
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;
+ if (fi.samplerate == 0) {
+ fi.samplerate = s->samplerate;
+ } else if (s->samplerate && fi.samplerate != s->samplerate) {
+ av_log(s->avctx, AV_LOG_WARNING, "sample rate changed from %d to %d\n",
+ s->samplerate, fi.samplerate);
}
+ s->samplerate = s->avctx->sample_rate = fi.samplerate;
- s->blocksize = blocksize;
- s->samplerate = samplerate;
- s->bps = bps;
- s->decorrelation= decorrelation;
+ if (!s->got_streaminfo) {
+ allocate_buffers(s);
+ s->got_streaminfo = 1;
+ dump_headers(s->avctx, (FLACStreaminfo *)s);
+ }
// dump_headers(s->avctx, (FLACStreaminfo *)s);
return -1;
}
- align_get_bits(&s->gb);
+ align_get_bits(gb);
/* frame footer */
- skip_bits(&s->gb, 16); /* data crc */
+ skip_bits(gb, 16); /* data crc */
return 0;
}
static int flac_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- const uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
FLACContext *s = avctx->priv_data;
- int i, j = 0, input_buf_size = 0, bytes_read = 0;
+ int i, j = 0, bytes_read = 0;
int16_t *samples_16 = data;
int32_t *samples_32 = data;
int alloc_data_size= *data_size;
+ int output_size;
*data_size=0;
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);
- }
-
- 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;
-
- 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) {
- 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) {
- return input_buf_size;
- }
+ s->max_framesize =
+ ff_flac_get_max_frame_size(s->max_blocksize ? s->max_blocksize : FLAC_MAX_BLOCKSIZE,
+ FLAC_MAX_CHANNELS, 32);
}
/* check that there is at least the smallest decodable amount of data.
- this amount corresponds to the smallest valid FLAC frame possible. */
- if (buf_size < 11)
- goto end;
+ this amount corresponds to the smallest valid FLAC frame possible.
+ FF F8 69 02 00 00 9A 00 00 34 46 */
+ if (buf_size < FLAC_MIN_FRAME_SIZE)
+ return buf_size;
/* check for inline header */
if (AV_RB32(buf) == MKBETAG('f','L','a','C')) {
av_log(s->avctx, AV_LOG_ERROR, "invalid header\n");
return -1;
}
- bytes_read = get_metadata_size(buf, buf_size);
- goto end;
- }
-
- /* check for frame sync code and resync stream if necessary */
- if ((AV_RB16(buf) & 0xFFFE) != 0xFFF8) {
- const uint8_t *buf_end = buf + buf_size;
- av_log(s->avctx, AV_LOG_ERROR, "FRAME HEADER not here\n");
- while (buf+2 < buf_end && (AV_RB16(buf) & 0xFFFE) != 0xFFF8)
- buf++;
- bytes_read = buf_size - (buf_end - buf);
- goto end; // we may not have enough bits left to decode a frame, so try next time
+ return get_metadata_size(buf, buf_size);
}
/* decode frame */
init_get_bits(&s->gb, buf, buf_size*8);
- skip_bits(&s->gb, 16);
- if (decode_frame(s, alloc_data_size) < 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;
}
- *data_size = s->blocksize * s->channels * (s->is32 ? 4 : 2);
bytes_read = (get_bits_count(&s->gb)+7)/8;
+ /* check if allocated data size is large enough for output */
+ output_size = s->blocksize * s->channels * (s->is32 ? 4 : 2);
+ if (output_size > alloc_data_size) {
+ av_log(s->avctx, AV_LOG_ERROR, "output data size is larger than "
+ "allocated data size\n");
+ return -1;
+ }
+ *data_size = output_size;
+
#define DECORRELATE(left, right)\
assert(s->channels == 2);\
for (i = 0; i < s->blocksize; i++) {\
}\
break;
- switch (s->decorrelation) {
- case INDEPENDENT:
+ switch (s->ch_mode) {
+ case FLAC_CHMODE_INDEPENDENT:
for (j = 0; j < s->blocksize; j++) {
for (i = 0; i < s->channels; i++) {
if (s->is32)
}
}
break;
- case LEFT_SIDE:
+ case FLAC_CHMODE_LEFT_SIDE:
DECORRELATE(a,a-b)
- case RIGHT_SIDE:
+ case FLAC_CHMODE_RIGHT_SIDE:
DECORRELATE(a+b,b)
- case MID_SIDE:
+ case FLAC_CHMODE_MID_SIDE:
DECORRELATE( (a-=b>>1) + b, a)
}
-end:
if (bytes_read > buf_size) {
av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", bytes_read - buf_size);
- s->bitstream_size=0;
- s->bitstream_index=0;
return -1;
}
+ if (bytes_read < buf_size) {
+ av_log(s->avctx, AV_LOG_DEBUG, "underread: %d orig size: %d\n",
+ buf_size - bytes_read, buf_size);
+ }
- if (s->bitstream_size) {
- s->bitstream_index += bytes_read;
- s->bitstream_size -= bytes_read;
- return input_buf_size;
- } else
- return bytes_read;
+ return bytes_read;
}
static av_cold int flac_decode_close(AVCodecContext *avctx)
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 = {
+AVCodec ff_flac_decoder = {
"flac",
- CODEC_TYPE_AUDIO,
+ AVMEDIA_TYPE_AUDIO,
CODEC_ID_FLAC,
sizeof(FLACContext),
flac_decode_init,
NULL,
flac_decode_close,
flac_decode_frame,
- CODEC_CAP_DELAY,
- .flush= flac_flush,
.long_name= NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
};