2004-02-18 03:22:05 +02:00
|
|
|
/*
|
|
|
|
* FLAC (Free Lossless Audio Codec) decoder
|
|
|
|
* Copyright (c) 2003 Alex Beregszaszi
|
|
|
|
*
|
2006-10-07 18:30:46 +03:00
|
|
|
* This file is part of FFmpeg.
|
|
|
|
*
|
|
|
|
* FFmpeg is free software; you can redistribute it and/or
|
2004-02-18 03:22:05 +02:00
|
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
|
|
* License as published by the Free Software Foundation; either
|
2006-10-07 18:30:46 +03:00
|
|
|
* version 2.1 of the License, or (at your option) any later version.
|
2004-02-18 03:22:05 +02:00
|
|
|
*
|
2006-10-07 18:30:46 +03:00
|
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
2004-02-18 03:22:05 +02:00
|
|
|
* 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
|
2006-10-07 18:30:46 +03:00
|
|
|
* License along with FFmpeg; if not, write to the Free Software
|
2006-01-13 00:43:26 +02:00
|
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
2004-02-18 03:22:05 +02:00
|
|
|
*/
|
|
|
|
|
|
|
|
/**
|
2010-04-20 17:45:34 +03:00
|
|
|
* @file
|
2004-02-18 03:22:05 +02:00
|
|
|
* FLAC (Free Lossless Audio Codec) decoder
|
|
|
|
* @author Alex Beregszaszi
|
2011-07-14 04:56:07 +03:00
|
|
|
* @see http://flac.sourceforge.net/
|
2004-06-10 07:13:43 +03:00
|
|
|
*
|
|
|
|
* 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.
|
2004-02-18 03:22:05 +02:00
|
|
|
*/
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2004-02-18 03:49:30 +02:00
|
|
|
#include <limits.h>
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2012-02-10 06:44:10 +03:00
|
|
|
#include "libavutil/audioconvert.h"
|
2008-05-09 14:56:36 +03:00
|
|
|
#include "libavutil/crc.h"
|
2004-02-18 03:22:05 +02:00
|
|
|
#include "avcodec.h"
|
2009-03-03 06:45:45 +02:00
|
|
|
#include "internal.h"
|
2009-04-13 19:20:26 +03:00
|
|
|
#include "get_bits.h"
|
2009-03-05 02:56:09 +02:00
|
|
|
#include "bytestream.h"
|
2004-02-18 03:22:05 +02:00
|
|
|
#include "golomb.h"
|
2008-05-03 00:33:14 +03:00
|
|
|
#include "flac.h"
|
2009-03-21 03:16:38 +02:00
|
|
|
#include "flacdata.h"
|
2012-06-17 17:10:40 +03:00
|
|
|
#include "flacdsp.h"
|
2004-02-18 03:22:05 +02:00
|
|
|
|
2004-02-18 03:49:30 +02:00
|
|
|
#undef NDEBUG
|
|
|
|
#include <assert.h>
|
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
typedef struct FLACContext {
|
2008-05-03 00:33:14 +03:00
|
|
|
FLACSTREAMINFO
|
|
|
|
|
2009-01-31 04:10:43 +02:00
|
|
|
AVCodecContext *avctx; ///< parent AVCodecContext
|
2011-09-06 19:17:45 +03:00
|
|
|
AVFrame frame;
|
2009-01-31 04:10:43 +02:00
|
|
|
GetBitContext gb; ///< GetBitContext initialized to start at the current frame
|
2004-02-18 03:22:05 +02:00
|
|
|
|
2009-01-31 04:10:43 +02:00
|
|
|
int blocksize; ///< number of samples in the current frame
|
2009-01-31 04:11:37 +02:00
|
|
|
int sample_shift; ///< shift required to make output samples 16-bit or 32-bit
|
2009-03-21 02:47:04 +02:00
|
|
|
int ch_mode; ///< channel decorrelation type in the current frame
|
2009-03-04 01:49:36 +02:00
|
|
|
int got_streaminfo; ///< indicates if the STREAMINFO has been read
|
2004-02-18 03:22:05 +02:00
|
|
|
|
2009-03-19 05:04:21 +02:00
|
|
|
int32_t *decoded[FLAC_MAX_CHANNELS]; ///< decoded samples
|
2012-06-17 17:10:40 +03:00
|
|
|
|
|
|
|
FLACDSPContext dsp;
|
2004-02-18 03:22:05 +02:00
|
|
|
} FLACContext;
|
|
|
|
|
2012-02-10 06:44:10 +03:00
|
|
|
static const int64_t flac_channel_layouts[6] = {
|
|
|
|
AV_CH_LAYOUT_MONO,
|
|
|
|
AV_CH_LAYOUT_STEREO,
|
|
|
|
AV_CH_LAYOUT_SURROUND,
|
|
|
|
AV_CH_LAYOUT_QUAD,
|
|
|
|
AV_CH_LAYOUT_5POINT0,
|
|
|
|
AV_CH_LAYOUT_5POINT1
|
|
|
|
};
|
|
|
|
|
2006-11-24 00:22:03 +02:00
|
|
|
static void allocate_buffers(FLACContext *s);
|
2009-02-26 04:29:24 +02:00
|
|
|
|
2012-07-03 02:28:32 +03:00
|
|
|
static void flac_set_bps(FLACContext *s)
|
|
|
|
{
|
2012-07-03 02:29:30 +03:00
|
|
|
enum AVSampleFormat req = s->avctx->request_sample_fmt;
|
|
|
|
int need32 = s->bps > 16;
|
|
|
|
int want32 = av_get_bytes_per_sample(req) > 2;
|
|
|
|
int planar = av_sample_fmt_is_planar(req);
|
|
|
|
|
|
|
|
if (need32 || want32) {
|
|
|
|
if (planar)
|
|
|
|
s->avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
|
|
|
|
else
|
|
|
|
s->avctx->sample_fmt = AV_SAMPLE_FMT_S32;
|
2012-07-03 02:28:32 +03:00
|
|
|
s->sample_shift = 32 - s->bps;
|
|
|
|
} else {
|
2012-07-03 02:29:30 +03:00
|
|
|
if (planar)
|
|
|
|
s->avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
|
|
|
|
else
|
|
|
|
s->avctx->sample_fmt = AV_SAMPLE_FMT_S16;
|
2012-07-03 02:28:32 +03:00
|
|
|
s->sample_shift = 16 - s->bps;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
static av_cold int flac_decode_init(AVCodecContext *avctx)
|
2004-02-18 03:22:05 +02:00
|
|
|
{
|
2009-02-26 04:29:24 +02:00
|
|
|
enum FLACExtradataFormat format;
|
|
|
|
uint8_t *streaminfo;
|
2004-06-10 07:13:43 +03:00
|
|
|
FLACContext *s = avctx->priv_data;
|
|
|
|
s->avctx = avctx;
|
|
|
|
|
2009-02-26 04:29:24 +02:00
|
|
|
/* for now, the raw FLAC header is allowed to be passed to the decoder as
|
|
|
|
frame data instead of extradata. */
|
|
|
|
if (!avctx->extradata)
|
|
|
|
return 0;
|
|
|
|
|
2011-10-17 10:28:53 +03:00
|
|
|
if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
|
2009-02-26 04:29:24 +02:00
|
|
|
return -1;
|
|
|
|
|
2009-02-26 04:30:29 +02:00
|
|
|
/* initialize based on the demuxer-supplied streamdata header */
|
2011-10-17 10:28:53 +03:00
|
|
|
avpriv_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, streaminfo);
|
2009-02-26 04:30:29 +02:00
|
|
|
allocate_buffers(s);
|
2012-07-03 02:28:32 +03:00
|
|
|
flac_set_bps(s);
|
2012-07-03 02:29:30 +03:00
|
|
|
ff_flacdsp_init(&s->dsp, avctx->sample_fmt, s->bps);
|
2009-03-04 01:49:36 +02:00
|
|
|
s->got_streaminfo = 1;
|
2004-06-10 07:13:43 +03:00
|
|
|
|
2011-09-06 19:17:45 +03:00
|
|
|
avcodec_get_frame_defaults(&s->frame);
|
|
|
|
avctx->coded_frame = &s->frame;
|
|
|
|
|
2012-02-10 06:44:10 +03:00
|
|
|
if (avctx->channels <= FF_ARRAY_ELEMS(flac_channel_layouts))
|
|
|
|
avctx->channel_layout = flac_channel_layouts[avctx->channels - 1];
|
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-05-03 00:34:34 +03:00
|
|
|
static void dump_headers(AVCodecContext *avctx, FLACStreaminfo *s)
|
2004-02-18 03:22:05 +02:00
|
|
|
{
|
2009-03-03 07:25:23 +02:00
|
|
|
av_log(avctx, AV_LOG_DEBUG, " Max Blocksize: %d\n", s->max_blocksize);
|
2008-05-03 00:30:32 +03:00
|
|
|
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);
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
static void allocate_buffers(FLACContext *s)
|
|
|
|
{
|
2004-02-18 03:22:05 +02:00
|
|
|
int i;
|
|
|
|
|
2004-02-18 03:49:30 +02:00
|
|
|
assert(s->max_blocksize);
|
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
for (i = 0; i < s->channels; i++) {
|
2012-07-03 01:16:30 +03:00
|
|
|
s->decoded[i] = av_malloc(sizeof(int32_t)*s->max_blocksize);
|
2004-02-18 03:49:30 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-11-24 00:22:03 +02:00
|
|
|
/**
|
2009-03-05 02:56:09 +02:00
|
|
|
* Parse the STREAMINFO from an inline header.
|
|
|
|
* @param s the flac decoding context
|
|
|
|
* @param buf input buffer, starting with the "fLaC" marker
|
|
|
|
* @param buf_size buffer size
|
2009-03-04 02:52:18 +02:00
|
|
|
* @return non-zero if metadata is invalid
|
2006-11-24 00:22:03 +02:00
|
|
|
*/
|
2009-03-05 02:56:09 +02:00
|
|
|
static int parse_streaminfo(FLACContext *s, const uint8_t *buf, int buf_size)
|
2006-11-24 00:22:03 +02:00
|
|
|
{
|
2009-03-05 02:56:09 +02:00
|
|
|
int metadata_type, metadata_size;
|
2006-11-24 00:22:03 +02:00
|
|
|
|
2009-03-05 02:56:09 +02:00
|
|
|
if (buf_size < FLAC_STREAMINFO_SIZE+8) {
|
|
|
|
/* need more data */
|
|
|
|
return 0;
|
|
|
|
}
|
2011-10-17 10:28:53 +03:00
|
|
|
avpriv_flac_parse_block_header(&buf[4], NULL, &metadata_type, &metadata_size);
|
2009-03-05 02:56:09 +02:00
|
|
|
if (metadata_type != FLAC_METADATA_TYPE_STREAMINFO ||
|
|
|
|
metadata_size != FLAC_STREAMINFO_SIZE) {
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
2011-10-17 10:28:53 +03:00
|
|
|
avpriv_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s, &buf[8]);
|
2009-03-05 02:56:09 +02:00
|
|
|
allocate_buffers(s);
|
2012-06-17 17:10:40 +03:00
|
|
|
flac_set_bps(s);
|
2012-07-03 02:29:30 +03:00
|
|
|
ff_flacdsp_init(&s->dsp, s->avctx->sample_fmt, s->bps);
|
2009-03-05 02:56:09 +02:00
|
|
|
s->got_streaminfo = 1;
|
2006-11-24 00:22:03 +02:00
|
|
|
|
2009-03-05 02:56:09 +02:00
|
|
|
return 0;
|
|
|
|
}
|
2006-11-24 00:22:03 +02:00
|
|
|
|
2009-03-05 02:56:09 +02:00
|
|
|
/**
|
|
|
|
* Determine the size of an inline header.
|
|
|
|
* @param buf input buffer, starting with the "fLaC" marker
|
|
|
|
* @param buf_size buffer size
|
|
|
|
* @return number of bytes in the header, or 0 if more data is needed
|
|
|
|
*/
|
|
|
|
static int get_metadata_size(const uint8_t *buf, int buf_size)
|
|
|
|
{
|
|
|
|
int metadata_last, metadata_size;
|
|
|
|
const uint8_t *buf_end = buf + buf_size;
|
2008-07-18 15:03:21 +03:00
|
|
|
|
2009-03-05 02:56:09 +02:00
|
|
|
buf += 4;
|
|
|
|
do {
|
2011-09-13 22:13:44 +03:00
|
|
|
if (buf_end - buf < 4)
|
|
|
|
return 0;
|
2011-10-17 10:28:53 +03:00
|
|
|
avpriv_flac_parse_block_header(buf, &metadata_last, NULL, &metadata_size);
|
2009-03-06 03:25:11 +02:00
|
|
|
buf += 4;
|
2011-09-13 22:13:44 +03:00
|
|
|
if (buf_end - buf < metadata_size) {
|
2009-03-05 02:56:09 +02:00
|
|
|
/* need more data in order to read the complete header */
|
|
|
|
return 0;
|
2009-03-04 02:53:04 +02:00
|
|
|
}
|
2009-03-05 02:56:09 +02:00
|
|
|
buf += metadata_size;
|
2009-03-04 02:53:04 +02:00
|
|
|
} while (!metadata_last);
|
2006-11-24 00:22:03 +02:00
|
|
|
|
2009-03-05 02:56:09 +02:00
|
|
|
return buf_size - (buf_end - buf);
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static int decode_residuals(FLACContext *s, int channel, int pred_order)
|
|
|
|
{
|
|
|
|
int i, tmp, partition, method_type, rice_order;
|
|
|
|
int sample = 0, samples;
|
|
|
|
|
|
|
|
method_type = get_bits(&s->gb, 2);
|
2009-01-24 20:51:43 +02:00
|
|
|
if (method_type > 1) {
|
2009-01-24 21:05:52 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal residual coding method %d\n",
|
|
|
|
method_type);
|
2004-02-18 03:22:05 +02:00
|
|
|
return -1;
|
2004-02-18 03:49:30 +02:00
|
|
|
}
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
rice_order = get_bits(&s->gb, 4);
|
|
|
|
|
2004-02-18 03:49:30 +02:00
|
|
|
samples= s->blocksize >> rice_order;
|
2007-01-21 11:55:28 +02:00
|
|
|
if (pred_order > samples) {
|
2009-01-24 21:05:52 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid predictor order: %i > %i\n",
|
|
|
|
pred_order, samples);
|
2007-01-21 11:55:28 +02:00
|
|
|
return -1;
|
|
|
|
}
|
2004-02-18 03:22:05 +02:00
|
|
|
|
2005-12-17 20:14:38 +02:00
|
|
|
sample=
|
2004-02-18 03:49:30 +02:00
|
|
|
i= pred_order;
|
2009-01-24 20:51:43 +02:00
|
|
|
for (partition = 0; partition < (1 << rice_order); partition++) {
|
2007-11-04 01:54:50 +02:00
|
|
|
tmp = get_bits(&s->gb, method_type == 0 ? 4 : 5);
|
2009-01-24 20:51:43 +02:00
|
|
|
if (tmp == (method_type == 0 ? 15 : 31)) {
|
2004-02-18 03:22:05 +02:00
|
|
|
tmp = get_bits(&s->gb, 5);
|
|
|
|
for (; i < samples; i++, sample++)
|
2009-03-03 04:19:01 +02:00
|
|
|
s->decoded[channel][sample] = get_sbits_long(&s->gb, tmp);
|
2009-01-24 20:51:43 +02:00
|
|
|
} else {
|
|
|
|
for (; i < samples; i++, sample++) {
|
2004-02-18 04:00:55 +02:00
|
|
|
s->decoded[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
|
2004-02-18 03:49:30 +02:00
|
|
|
}
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
2004-02-18 03:49:30 +02:00
|
|
|
i= 0;
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2005-12-17 20:14:38 +02:00
|
|
|
}
|
2004-02-18 03:22:05 +02:00
|
|
|
|
2012-07-02 03:43:12 +03:00
|
|
|
static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order,
|
|
|
|
int bps)
|
2004-02-18 03:22:05 +02:00
|
|
|
{
|
2007-09-30 05:12:03 +03:00
|
|
|
const int blocksize = s->blocksize;
|
|
|
|
int32_t *decoded = s->decoded[channel];
|
2012-02-13 10:24:00 +03:00
|
|
|
int a, b, c, d, i;
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
/* warm up samples */
|
2009-01-24 20:51:43 +02:00
|
|
|
for (i = 0; i < pred_order; i++) {
|
2012-07-02 03:43:12 +03:00
|
|
|
decoded[i] = get_sbits_long(&s->gb, bps);
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
if (decode_residuals(s, channel, pred_order) < 0)
|
|
|
|
return -1;
|
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
if (pred_order > 0)
|
2008-05-04 04:08:40 +03:00
|
|
|
a = decoded[pred_order-1];
|
2009-01-24 20:51:43 +02:00
|
|
|
if (pred_order > 1)
|
2008-05-04 04:08:40 +03:00
|
|
|
b = a - decoded[pred_order-2];
|
2009-01-24 20:51:43 +02:00
|
|
|
if (pred_order > 2)
|
2008-05-04 04:08:40 +03:00
|
|
|
c = b - decoded[pred_order-2] + decoded[pred_order-3];
|
2009-01-24 20:51:43 +02:00
|
|
|
if (pred_order > 3)
|
2008-05-04 04:08:40 +03:00
|
|
|
d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
|
2007-09-30 05:12:03 +03:00
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
switch (pred_order) {
|
|
|
|
case 0:
|
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
for (i = pred_order; i < blocksize; i++)
|
|
|
|
decoded[i] = a += decoded[i];
|
|
|
|
break;
|
|
|
|
case 2:
|
|
|
|
for (i = pred_order; i < blocksize; i++)
|
|
|
|
decoded[i] = a += b += decoded[i];
|
|
|
|
break;
|
|
|
|
case 3:
|
|
|
|
for (i = pred_order; i < blocksize; i++)
|
|
|
|
decoded[i] = a += b += c += decoded[i];
|
|
|
|
break;
|
|
|
|
case 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;
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
2004-02-18 03:49:30 +02:00
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-07-02 03:43:12 +03:00
|
|
|
static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order,
|
|
|
|
int bps)
|
2004-02-18 03:22:05 +02:00
|
|
|
{
|
2012-07-02 15:51:04 +03:00
|
|
|
int i;
|
2004-02-18 03:22:05 +02:00
|
|
|
int coeff_prec, qlevel;
|
2009-08-20 00:59:36 +03:00
|
|
|
int coeffs[32];
|
2007-09-30 06:01:56 +03:00
|
|
|
int32_t *decoded = s->decoded[channel];
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
/* warm up samples */
|
2009-01-24 20:51:43 +02:00
|
|
|
for (i = 0; i < pred_order; i++) {
|
2012-07-02 03:43:12 +03:00
|
|
|
decoded[i] = get_sbits_long(&s->gb, bps);
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
coeff_prec = get_bits(&s->gb, 4) + 1;
|
2009-01-24 20:51:43 +02:00
|
|
|
if (coeff_prec == 16) {
|
2009-01-24 18:03:17 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid coeff precision\n");
|
2004-02-18 03:22:05 +02:00
|
|
|
return -1;
|
|
|
|
}
|
2004-02-18 03:49:30 +02:00
|
|
|
qlevel = get_sbits(&s->gb, 5);
|
2009-01-24 20:51:43 +02:00
|
|
|
if (qlevel < 0) {
|
2009-01-24 21:05:52 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "qlevel %d not supported, maybe buggy stream\n",
|
|
|
|
qlevel);
|
2004-02-18 06:10:52 +02:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
for (i = 0; i < pred_order; i++) {
|
2012-07-05 14:25:40 +03:00
|
|
|
coeffs[pred_order - i - 1] = get_sbits(&s->gb, coeff_prec);
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
if (decode_residuals(s, channel, pred_order) < 0)
|
|
|
|
return -1;
|
|
|
|
|
2012-07-02 15:51:04 +03:00
|
|
|
s->dsp.lpc(decoded, coeffs, pred_order, qlevel, s->blocksize);
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int decode_subframe(FLACContext *s, int channel)
|
|
|
|
{
|
|
|
|
int type, wasted = 0;
|
2012-07-02 03:43:12 +03:00
|
|
|
int bps = s->bps;
|
2004-02-18 03:22:05 +02:00
|
|
|
int i, tmp;
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
if (channel == 0) {
|
2009-03-21 02:47:04 +02:00
|
|
|
if (s->ch_mode == FLAC_CHMODE_RIGHT_SIDE)
|
2012-07-02 03:43:12 +03:00
|
|
|
bps++;
|
2009-01-24 20:51:43 +02:00
|
|
|
} else {
|
2009-03-21 02:47:04 +02:00
|
|
|
if (s->ch_mode == FLAC_CHMODE_LEFT_SIDE || s->ch_mode == FLAC_CHMODE_MID_SIDE)
|
2012-07-02 03:43:12 +03:00
|
|
|
bps++;
|
2004-02-18 03:49:30 +02:00
|
|
|
}
|
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
if (get_bits1(&s->gb)) {
|
2005-09-05 12:28:46 +03:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid subframe padding\n");
|
2004-02-18 03:22:05 +02:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
type = get_bits(&s->gb, 6);
|
2009-01-24 17:46:19 +02:00
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
if (get_bits1(&s->gb)) {
|
2012-02-15 20:52:11 +03:00
|
|
|
int left = get_bits_left(&s->gb);
|
2004-02-18 03:22:05 +02:00
|
|
|
wasted = 1;
|
2012-02-15 20:52:11 +03:00
|
|
|
if ( left < 0 ||
|
2012-07-02 03:43:12 +03:00
|
|
|
(left < bps && !show_bits_long(&s->gb, left)) ||
|
|
|
|
!show_bits_long(&s->gb, bps)) {
|
2012-02-15 20:52:11 +03:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
|
|
"Invalid number of wasted bits > available bits (%d) - left=%d\n",
|
2012-07-02 03:43:12 +03:00
|
|
|
bps, left);
|
2012-02-15 20:52:11 +03:00
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
2004-02-18 03:22:05 +02:00
|
|
|
while (!get_bits1(&s->gb))
|
|
|
|
wasted++;
|
2012-07-02 03:43:12 +03:00
|
|
|
bps -= wasted;
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
2012-07-02 03:43:12 +03:00
|
|
|
if (bps > 32) {
|
2009-06-29 22:07:04 +03:00
|
|
|
av_log_missing_feature(s->avctx, "decorrelated bit depth > 32", 0);
|
2009-03-05 01:10:40 +02:00
|
|
|
return -1;
|
|
|
|
}
|
2009-01-24 17:46:19 +02:00
|
|
|
|
2004-02-18 03:49:30 +02:00
|
|
|
//FIXME use av_log2 for types
|
2009-01-24 20:51:43 +02:00
|
|
|
if (type == 0) {
|
2012-07-02 03:43:12 +03:00
|
|
|
tmp = get_sbits_long(&s->gb, bps);
|
2004-02-18 03:22:05 +02:00
|
|
|
for (i = 0; i < s->blocksize; i++)
|
|
|
|
s->decoded[channel][i] = tmp;
|
2009-01-24 20:51:43 +02:00
|
|
|
} else if (type == 1) {
|
2004-02-18 03:22:05 +02:00
|
|
|
for (i = 0; i < s->blocksize; i++)
|
2012-07-02 03:43:12 +03:00
|
|
|
s->decoded[channel][i] = get_sbits_long(&s->gb, bps);
|
2009-01-24 20:51:43 +02:00
|
|
|
} else if ((type >= 8) && (type <= 12)) {
|
2012-07-02 03:43:12 +03:00
|
|
|
if (decode_subframe_fixed(s, channel, type & ~0x8, bps) < 0)
|
2004-02-18 03:22:05 +02:00
|
|
|
return -1;
|
2009-01-24 20:51:43 +02:00
|
|
|
} else if (type >= 32) {
|
2012-07-02 03:43:12 +03:00
|
|
|
if (decode_subframe_lpc(s, channel, (type & ~0x20)+1, bps) < 0)
|
2004-02-18 03:22:05 +02:00
|
|
|
return -1;
|
2009-01-24 20:51:43 +02:00
|
|
|
} else {
|
2005-09-05 12:28:46 +03:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid coding type\n");
|
2004-02-18 03:22:05 +02:00
|
|
|
return -1;
|
|
|
|
}
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
if (wasted) {
|
2004-02-18 03:22:05 +02:00
|
|
|
int i;
|
|
|
|
for (i = 0; i < s->blocksize; i++)
|
|
|
|
s->decoded[channel][i] <<= wasted;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-03-24 03:17:55 +02:00
|
|
|
static int decode_frame(FLACContext *s)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
GetBitContext *gb = &s->gb;
|
|
|
|
FLACFrameInfo fi;
|
|
|
|
|
2010-12-07 16:00:38 +02:00
|
|
|
if (ff_flac_decode_frame_header(s->avctx, gb, &fi, 0)) {
|
2009-03-24 03:17:55 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid frame header\n");
|
2004-02-18 06:10:52 +02:00
|
|
|
return -1;
|
|
|
|
}
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2010-10-02 23:37:43 +03:00
|
|
|
if (s->channels && fi.channels != s->channels) {
|
2009-03-23 01:19:49 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "switching channel layout mid-stream "
|
|
|
|
"is not supported\n");
|
|
|
|
return -1;
|
|
|
|
}
|
2010-10-02 23:37:43 +03:00
|
|
|
s->channels = s->avctx->channels = fi.channels;
|
2009-03-24 03:17:55 +02:00
|
|
|
s->ch_mode = fi.ch_mode;
|
2009-03-23 01:19:49 +02:00
|
|
|
|
2010-10-02 23:37:43 +03:00
|
|
|
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) {
|
2009-03-23 01:19:49 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "switching bps mid-stream is not "
|
|
|
|
"supported\n");
|
|
|
|
return -1;
|
|
|
|
}
|
2010-10-02 23:37:43 +03:00
|
|
|
|
2012-07-03 02:29:30 +03:00
|
|
|
if (!s->bps) {
|
|
|
|
s->bps = s->avctx->bits_per_raw_sample = fi.bps;
|
|
|
|
flac_set_bps(s);
|
|
|
|
}
|
2009-03-23 01:19:49 +02:00
|
|
|
|
2010-10-02 23:37:43 +03:00
|
|
|
if (!s->max_blocksize)
|
|
|
|
s->max_blocksize = FLAC_MAX_BLOCKSIZE;
|
2009-03-24 03:17:55 +02:00
|
|
|
if (fi.blocksize > s->max_blocksize) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", fi.blocksize,
|
2009-03-23 01:19:49 +02:00
|
|
|
s->max_blocksize);
|
|
|
|
return -1;
|
|
|
|
}
|
2009-03-24 03:17:55 +02:00
|
|
|
s->blocksize = fi.blocksize;
|
2009-03-23 01:19:49 +02:00
|
|
|
|
2010-10-02 23:37:43 +03:00
|
|
|
if (!s->samplerate && !fi.samplerate) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "sample rate not found in STREAMINFO"
|
|
|
|
" or frame header\n");
|
|
|
|
return -1;
|
|
|
|
}
|
2009-03-24 03:17:55 +02:00
|
|
|
if (fi.samplerate == 0) {
|
|
|
|
fi.samplerate = s->samplerate;
|
2010-10-02 23:37:43 +03:00
|
|
|
} else if (s->samplerate && fi.samplerate != s->samplerate) {
|
2009-03-23 01:19:49 +02:00
|
|
|
av_log(s->avctx, AV_LOG_WARNING, "sample rate changed from %d to %d\n",
|
2009-03-24 03:17:55 +02:00
|
|
|
s->samplerate, fi.samplerate);
|
2009-03-23 01:19:49 +02:00
|
|
|
}
|
2009-03-24 03:17:55 +02:00
|
|
|
s->samplerate = s->avctx->sample_rate = fi.samplerate;
|
2004-02-18 03:22:05 +02:00
|
|
|
|
2010-10-02 23:37:43 +03:00
|
|
|
if (!s->got_streaminfo) {
|
|
|
|
allocate_buffers(s);
|
2012-07-03 02:29:30 +03:00
|
|
|
ff_flacdsp_init(&s->dsp, s->avctx->sample_fmt, s->bps);
|
2010-10-02 23:37:43 +03:00
|
|
|
s->got_streaminfo = 1;
|
|
|
|
dump_headers(s->avctx, (FLACStreaminfo *)s);
|
|
|
|
}
|
|
|
|
|
2008-05-03 00:34:34 +03:00
|
|
|
// dump_headers(s->avctx, (FLACStreaminfo *)s);
|
2004-02-18 03:22:05 +02:00
|
|
|
|
|
|
|
/* subframes */
|
2009-01-24 20:51:43 +02:00
|
|
|
for (i = 0; i < s->channels; i++) {
|
2004-02-18 03:22:05 +02:00
|
|
|
if (decode_subframe(s, i) < 0)
|
|
|
|
return -1;
|
|
|
|
}
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2009-03-22 20:52:15 +02:00
|
|
|
align_get_bits(gb);
|
2004-02-18 03:22:05 +02:00
|
|
|
|
|
|
|
/* frame footer */
|
2009-03-22 20:52:15 +02:00
|
|
|
skip_bits(gb, 16); /* data crc */
|
2004-02-18 03:22:05 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-09-06 19:17:45 +03:00
|
|
|
static int flac_decode_frame(AVCodecContext *avctx, void *data,
|
|
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
2004-02-18 03:22:05 +02:00
|
|
|
{
|
2009-04-07 18:59:50 +03:00
|
|
|
const uint8_t *buf = avpkt->data;
|
|
|
|
int buf_size = avpkt->size;
|
2004-02-18 03:22:05 +02:00
|
|
|
FLACContext *s = avctx->priv_data;
|
2012-06-17 17:10:40 +03:00
|
|
|
int bytes_read = 0;
|
2011-09-06 19:17:45 +03:00
|
|
|
int ret;
|
2007-01-15 01:50:06 +02:00
|
|
|
|
2011-09-06 19:17:45 +03:00
|
|
|
*got_frame_ptr = 0;
|
2004-02-18 03:22:05 +02:00
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
if (s->max_framesize == 0) {
|
2010-10-02 23:37:43 +03:00
|
|
|
s->max_framesize =
|
|
|
|
ff_flac_get_max_frame_size(s->max_blocksize ? s->max_blocksize : FLAC_MAX_BLOCKSIZE,
|
|
|
|
FLAC_MAX_CHANNELS, 32);
|
2004-02-18 03:49:30 +02:00
|
|
|
}
|
2004-02-18 03:22:05 +02:00
|
|
|
|
2009-03-05 01:55:10 +02:00
|
|
|
/* check that there is at least the smallest decodable amount of data.
|
2009-03-05 06:40:42 +02:00
|
|
|
this amount corresponds to the smallest valid FLAC frame possible.
|
|
|
|
FF F8 69 02 00 00 9A 00 00 34 46 */
|
2010-12-07 16:58:34 +02:00
|
|
|
if (buf_size < FLAC_MIN_FRAME_SIZE)
|
2010-12-07 16:57:02 +02:00
|
|
|
return buf_size;
|
2009-03-05 01:55:10 +02:00
|
|
|
|
2009-03-04 02:52:18 +02:00
|
|
|
/* check for inline header */
|
2009-03-05 02:56:09 +02:00
|
|
|
if (AV_RB32(buf) == MKBETAG('f','L','a','C')) {
|
|
|
|
if (!s->got_streaminfo && parse_streaminfo(s, buf, buf_size)) {
|
2009-03-04 02:52:18 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid header\n");
|
|
|
|
return -1;
|
|
|
|
}
|
2010-12-07 16:57:02 +02:00
|
|
|
return get_metadata_size(buf, buf_size);
|
2009-01-24 18:13:21 +02:00
|
|
|
}
|
2009-03-05 03:15:38 +02:00
|
|
|
|
|
|
|
/* decode frame */
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
2009-03-22 22:19:20 +02:00
|
|
|
if (decode_frame(s) < 0) {
|
2009-01-24 18:13:21 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
|
|
|
|
return -1;
|
|
|
|
}
|
2009-03-05 03:23:53 +02:00
|
|
|
bytes_read = (get_bits_count(&s->gb)+7)/8;
|
2004-02-18 03:49:30 +02:00
|
|
|
|
2011-09-06 19:17:45 +03:00
|
|
|
/* get output buffer */
|
|
|
|
s->frame.nb_samples = s->blocksize;
|
|
|
|
if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
|
|
return ret;
|
2009-03-22 22:19:20 +02:00
|
|
|
}
|
2012-06-17 17:10:40 +03:00
|
|
|
|
|
|
|
s->dsp.decorrelate[s->ch_mode](s->frame.data, s->decoded, s->channels,
|
|
|
|
s->blocksize, s->sample_shift);
|
2004-02-18 03:22:05 +02:00
|
|
|
|
2009-03-05 01:24:44 +02:00
|
|
|
if (bytes_read > buf_size) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", bytes_read - buf_size);
|
2004-02-18 03:49:30 +02:00
|
|
|
return -1;
|
|
|
|
}
|
2010-12-07 16:57:02 +02:00
|
|
|
if (bytes_read < buf_size) {
|
|
|
|
av_log(s->avctx, AV_LOG_DEBUG, "underread: %d orig size: %d\n",
|
|
|
|
buf_size - bytes_read, buf_size);
|
|
|
|
}
|
2004-02-18 03:22:05 +02:00
|
|
|
|
2011-09-06 19:17:45 +03:00
|
|
|
*got_frame_ptr = 1;
|
|
|
|
*(AVFrame *)data = s->frame;
|
|
|
|
|
2010-12-07 16:57:02 +02:00
|
|
|
return bytes_read;
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
|
|
|
|
2008-03-21 05:11:20 +02:00
|
|
|
static av_cold int flac_decode_close(AVCodecContext *avctx)
|
2004-02-18 03:22:05 +02:00
|
|
|
{
|
|
|
|
FLACContext *s = avctx->priv_data;
|
|
|
|
int i;
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2009-01-24 20:51:43 +02:00
|
|
|
for (i = 0; i < s->channels; i++) {
|
2004-02-18 03:49:30 +02:00
|
|
|
av_freep(&s->decoded[i]);
|
2004-02-18 03:22:05 +02:00
|
|
|
}
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2004-02-18 03:22:05 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-01-25 23:40:11 +02:00
|
|
|
AVCodec ff_flac_decoder = {
|
2011-07-17 13:54:31 +03:00
|
|
|
.name = "flac",
|
|
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
|
|
.id = CODEC_ID_FLAC,
|
|
|
|
.priv_data_size = sizeof(FLACContext),
|
|
|
|
.init = flac_decode_init,
|
|
|
|
.close = flac_decode_close,
|
|
|
|
.decode = flac_decode_frame,
|
2011-09-06 19:17:45 +03:00
|
|
|
.capabilities = CODEC_CAP_DR1,
|
2012-04-06 19:19:39 +03:00
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
|
2012-07-03 02:29:30 +03:00
|
|
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
|
|
|
|
AV_SAMPLE_FMT_S16P,
|
|
|
|
AV_SAMPLE_FMT_S32,
|
|
|
|
AV_SAMPLE_FMT_S32P,
|
|
|
|
-1 },
|
2004-02-18 03:22:05 +02:00
|
|
|
};
|