* FLAC (Free Lossless Audio Codec) decoder
* Copyright (c) 2003 Alex Beregszaszi
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/flacdec.c
+ * @file
* FLAC (Free Lossless Audio Codec) decoder
* @author Alex Beregszaszi
*
int got_streaminfo; ///< indicates if the STREAMINFO has been read
int32_t *decoded[FLAC_MAX_CHANNELS]; ///< decoded samples
- uint8_t *bitstream;
- unsigned int bitstream_size;
- unsigned int bitstream_index;
- unsigned int allocated_bitstream_size;
} FLACContext;
-static const int sample_size_table[] =
-{ 0, 8, 12, 0, 16, 20, 24, 0 };
-
-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) {
- s->max_framesize = ff_flac_get_max_frame_size(s->max_blocksize,
- s->channels, s->bps);
- }
-
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,
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);
return 0;
}
-/**
- * Validate and decode a frame header.
- * @param avctx AVCodecContext to use as av_log() context
- * @param gb GetBitContext from which to read frame header
- * @param[out] fi frame information
- * @return non-zero on error, 0 if ok
- */
-static int decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
- FLACFrameInfo *fi)
-{
- int bs_code, sr_code, bps_code;
-
- /* frame sync code */
- skip_bits(gb, 16);
-
- /* block size and sample rate codes */
- bs_code = get_bits(gb, 4);
- sr_code = get_bits(gb, 4);
-
- /* channels and decorrelation */
- fi->ch_mode = get_bits(gb, 4);
- if (fi->ch_mode < FLAC_MAX_CHANNELS) {
- fi->channels = fi->ch_mode + 1;
- fi->ch_mode = FLAC_CHMODE_INDEPENDENT;
- } else if (fi->ch_mode <= FLAC_CHMODE_MID_SIDE) {
- fi->channels = 2;
- } else {
- av_log(avctx, AV_LOG_ERROR, "invalid channel mode: %d\n", fi->ch_mode);
- return -1;
- }
-
- /* bits per sample */
- bps_code = get_bits(gb, 3);
- if (bps_code == 3 || bps_code == 7) {
- av_log(avctx, AV_LOG_ERROR, "invalid sample size code (%d)\n",
- bps_code);
- return -1;
- }
- fi->bps = sample_size_table[bps_code];
-
- /* reserved bit */
- if (get_bits1(gb)) {
- av_log(avctx, AV_LOG_ERROR, "broken stream, invalid padding\n");
- return -1;
- }
-
- /* sample or frame count */
- if (get_utf8(gb) < 0) {
- av_log(avctx, AV_LOG_ERROR, "utf8 fscked\n");
- return -1;
- }
-
- /* blocksize */
- if (bs_code == 0) {
- av_log(avctx, AV_LOG_ERROR, "reserved blocksize code: 0\n");
- return -1;
- } else if (bs_code == 6) {
- fi->blocksize = get_bits(gb, 8) + 1;
- } else if (bs_code == 7) {
- fi->blocksize = get_bits(gb, 16) + 1;
- } else {
- fi->blocksize = ff_flac_blocksize_table[bs_code];
- }
-
- /* sample rate */
- if (sr_code < 12) {
- fi->samplerate = ff_flac_sample_rate_table[sr_code];
- } else if (sr_code == 12) {
- fi->samplerate = get_bits(gb, 8) * 1000;
- } else if (sr_code == 13) {
- fi->samplerate = get_bits(gb, 16);
- } else if (sr_code == 14) {
- fi->samplerate = get_bits(gb, 16) * 10;
- } else {
- av_log(avctx, AV_LOG_ERROR, "illegal sample rate code %d\n",
- sr_code);
- return -1;
- }
-
- /* header CRC-8 check */
- skip_bits(gb, 8);
- if (av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, gb->buffer,
- get_bits_count(gb)/8)) {
- av_log(avctx, AV_LOG_ERROR, "header crc mismatch\n");
- return -1;
- }
-
- return 0;
-}
-
static int decode_frame(FLACContext *s)
{
int i;
GetBitContext *gb = &s->gb;
FLACFrameInfo fi;
- if (decode_frame_header(s->avctx, gb, &fi)) {
+ if (ff_flac_decode_frame_header(s->avctx, gb, &fi, 0)) {
av_log(s->avctx, AV_LOG_ERROR, "invalid frame header\n");
return -1;
}
- if (fi.channels != s->channels) {
+ 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;
}
+ s->channels = s->avctx->channels = fi.channels;
s->ch_mode = fi.ch_mode;
- if (fi.bps && fi.bps != s->bps) {
+ if (!s->bps && !fi.bps) {
+ av_log(s->avctx, AV_LOG_ERROR, "bps not found in STREAMINFO or frame header\n");
+ return -1;
+ }
+ 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 (s->bps > 16) {
- s->avctx->sample_fmt = SAMPLE_FMT_S32;
+ s->avctx->sample_fmt = AV_SAMPLE_FMT_S32;
s->sample_shift = 32 - s->bps;
s->is32 = 1;
} else {
- s->avctx->sample_fmt = SAMPLE_FMT_S16;
+ s->avctx->sample_fmt = AV_SAMPLE_FMT_S16;
s->sample_shift = 16 - s->bps;
s->is32 = 0;
}
+ 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);
}
s->blocksize = fi.blocksize;
+ if (!s->samplerate && !fi.samplerate) {
+ av_log(s->avctx, AV_LOG_ERROR, "sample rate not found in STREAMINFO"
+ " or frame header\n");
+ return -1;
+ }
if (fi.samplerate == 0) {
fi.samplerate = s->samplerate;
- } else if (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;
+ if (!s->got_streaminfo) {
+ allocate_buffers(s);
+ s->got_streaminfo = 1;
+ dump_headers(s->avctx, (FLACStreaminfo *)s);
+ }
+
// dump_headers(s->avctx, (FLACStreaminfo *)s);
/* subframes */
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;
*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.
FF F8 69 02 00 00 9A 00 00 34 46 */
- if (buf_size < 11)
- goto end;
+ 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);
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;
}
bytes_read = (get_bits_count(&s->gb)+7)/8;
if (output_size > alloc_data_size) {
av_log(s->avctx, AV_LOG_ERROR, "output data size is larger than "
"allocated data size\n");
- goto end;
+ return -1;
}
*data_size = output_size;
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 | CODEC_CAP_SUBFRAMES, /* FIXME: add a FLAC parser so that
- we will not need to use either
- of these capabilities */
- .flush= flac_flush,
.long_name= NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
};
projects / ffmpeg / blobdiff