2004-02-18 01:22:05 +00:00
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/*
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* FLAC (Free Lossless Audio Codec) decoder
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* Copyright (c) 2003 Alex Beregszaszi
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*
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2011-03-18 17:35:10 +00:00
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* This file is part of Libav.
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2006-10-07 15:30:46 +00:00
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*
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2011-03-18 17:35:10 +00:00
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* Libav is free software; you can redistribute it and/or
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2004-02-18 01:22:05 +00:00
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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2006-10-07 15:30:46 +00:00
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* version 2.1 of the License, or (at your option) any later version.
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2004-02-18 01:22:05 +00:00
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*
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2011-03-18 17:35:10 +00:00
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* Libav is distributed in the hope that it will be useful,
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2004-02-18 01:22:05 +00:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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2011-03-18 17:35:10 +00:00
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* License along with Libav; if not, write to the Free Software
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2006-01-12 22:43:26 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2004-02-18 01:22:05 +00:00
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*/
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/**
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2010-04-20 14:45:34 +00:00
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* @file
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2004-02-18 01:22:05 +00:00
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* FLAC (Free Lossless Audio Codec) decoder
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* @author Alex Beregszaszi
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2011-07-14 01:56:07 +00:00
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* @see http://flac.sourceforge.net/
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2004-06-10 04:13:43 +00:00
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*
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* This decoder can be used in 1 of 2 ways: Either raw FLAC data can be fed
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* through, starting from the initial 'fLaC' signature; or by passing the
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* 34-byte streaminfo structure through avctx->extradata[_size] followed
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* by data starting with the 0xFFF8 marker.
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2004-02-18 01:22:05 +00:00
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*/
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2005-12-17 18:14:38 +00:00
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2004-02-18 01:49:30 +00:00
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#include <limits.h>
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2005-12-17 18:14:38 +00:00
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2012-02-10 03:44:10 +00:00
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#include "libavutil/audioconvert.h"
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2008-05-09 11:56:36 +00:00
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#include "libavutil/crc.h"
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2004-02-18 01:22:05 +00:00
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#include "avcodec.h"
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2009-03-03 04:45:45 +00:00
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#include "internal.h"
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2009-04-13 16:20:26 +00:00
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#include "get_bits.h"
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2009-03-05 00:56:09 +00:00
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#include "bytestream.h"
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2004-02-18 01:22:05 +00:00
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#include "golomb.h"
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2008-05-02 21:33:14 +00:00
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#include "flac.h"
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2009-03-21 01:16:38 +00:00
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#include "flacdata.h"
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2004-02-18 01:22:05 +00:00
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2004-02-18 01:49:30 +00:00
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#undef NDEBUG
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#include <assert.h>
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2004-02-18 01:22:05 +00:00
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typedef struct FLACContext {
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2008-05-02 21:33:14 +00:00
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FLACSTREAMINFO
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2009-01-31 02:10:43 +00:00
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AVCodecContext *avctx; ///< parent AVCodecContext
|
2011-09-06 16:17:45 +00:00
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AVFrame frame;
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2009-01-31 02:10:43 +00:00
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GetBitContext gb; ///< GetBitContext initialized to start at the current frame
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2004-02-18 01:22:05 +00:00
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2009-01-31 02:10:43 +00:00
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int blocksize; ///< number of samples in the current frame
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int curr_bps; ///< bps for current subframe, adjusted for channel correlation and wasted bits
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2009-01-31 02:11:37 +00:00
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int sample_shift; ///< shift required to make output samples 16-bit or 32-bit
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int is32; ///< flag to indicate if output should be 32-bit instead of 16-bit
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2009-03-21 00:47:04 +00:00
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int ch_mode; ///< channel decorrelation type in the current frame
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2009-03-03 23:49:36 +00:00
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int got_streaminfo; ///< indicates if the STREAMINFO has been read
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2004-02-18 01:22:05 +00:00
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2009-03-19 03:04:21 +00:00
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int32_t *decoded[FLAC_MAX_CHANNELS]; ///< decoded samples
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2004-02-18 01:22:05 +00:00
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} FLACContext;
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|
2012-02-10 03:44:10 +00:00
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static const int64_t flac_channel_layouts[6] = {
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AV_CH_LAYOUT_MONO,
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AV_CH_LAYOUT_STEREO,
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AV_CH_LAYOUT_SURROUND,
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AV_CH_LAYOUT_QUAD,
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AV_CH_LAYOUT_5POINT0,
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AV_CH_LAYOUT_5POINT1
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};
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|
2006-11-23 22:22:03 +00:00
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static void allocate_buffers(FLACContext *s);
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2009-02-26 02:29:24 +00:00
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|
2011-10-17 07:28:53 +00:00
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int avpriv_flac_is_extradata_valid(AVCodecContext *avctx,
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2009-02-26 02:29:24 +00:00
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enum FLACExtradataFormat *format,
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uint8_t **streaminfo_start)
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{
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if (!avctx->extradata || avctx->extradata_size < FLAC_STREAMINFO_SIZE) {
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av_log(avctx, AV_LOG_ERROR, "extradata NULL or too small.\n");
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return 0;
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}
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if (AV_RL32(avctx->extradata) != MKTAG('f','L','a','C')) {
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/* extradata contains STREAMINFO only */
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if (avctx->extradata_size != FLAC_STREAMINFO_SIZE) {
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av_log(avctx, AV_LOG_WARNING, "extradata contains %d bytes too many.\n",
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FLAC_STREAMINFO_SIZE-avctx->extradata_size);
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}
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*format = FLAC_EXTRADATA_FORMAT_STREAMINFO;
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*streaminfo_start = avctx->extradata;
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} else {
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if (avctx->extradata_size < 8+FLAC_STREAMINFO_SIZE) {
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av_log(avctx, AV_LOG_ERROR, "extradata too small.\n");
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return 0;
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}
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*format = FLAC_EXTRADATA_FORMAT_FULL_HEADER;
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*streaminfo_start = &avctx->extradata[8];
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}
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return 1;
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}
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2004-06-10 04:13:43 +00:00
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2009-01-24 18:51:43 +00:00
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static av_cold int flac_decode_init(AVCodecContext *avctx)
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2004-02-18 01:22:05 +00:00
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{
|
2009-02-26 02:29:24 +00:00
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enum FLACExtradataFormat format;
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uint8_t *streaminfo;
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2004-06-10 04:13:43 +00:00
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FLACContext *s = avctx->priv_data;
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s->avctx = avctx;
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|
2010-11-12 11:04:40 +00:00
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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2009-02-02 01:53:40 +00:00
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2009-02-26 02:29:24 +00:00
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/* for now, the raw FLAC header is allowed to be passed to the decoder as
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frame data instead of extradata. */
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if (!avctx->extradata)
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return 0;
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|
2011-10-17 07:28:53 +00:00
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if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
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2009-02-26 02:29:24 +00:00
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return -1;
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2009-02-26 02:30:29 +00:00
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/* initialize based on the demuxer-supplied streamdata header */
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2011-10-17 07:28:53 +00:00
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avpriv_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, streaminfo);
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2009-11-01 16:48:05 +00:00
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if (s->bps > 16)
|
2010-11-12 11:04:40 +00:00
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avctx->sample_fmt = AV_SAMPLE_FMT_S32;
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2009-11-01 16:48:05 +00:00
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else
|
2010-11-12 11:04:40 +00:00
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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2009-02-26 02:30:29 +00:00
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allocate_buffers(s);
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2009-03-03 23:49:36 +00:00
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s->got_streaminfo = 1;
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2004-06-10 04:13:43 +00:00
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2011-09-06 16:17:45 +00:00
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avcodec_get_frame_defaults(&s->frame);
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avctx->coded_frame = &s->frame;
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|
2012-02-10 03:44:10 +00:00
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if (avctx->channels <= FF_ARRAY_ELEMS(flac_channel_layouts))
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avctx->channel_layout = flac_channel_layouts[avctx->channels - 1];
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2004-02-18 01:22:05 +00:00
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return 0;
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}
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2008-05-02 21:34:34 +00:00
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static void dump_headers(AVCodecContext *avctx, FLACStreaminfo *s)
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2004-02-18 01:22:05 +00:00
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{
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2009-03-03 05:25:23 +00:00
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av_log(avctx, AV_LOG_DEBUG, " Max Blocksize: %d\n", s->max_blocksize);
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2008-05-02 21:30:32 +00:00
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av_log(avctx, AV_LOG_DEBUG, " Max Framesize: %d\n", s->max_framesize);
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av_log(avctx, AV_LOG_DEBUG, " Samplerate: %d\n", s->samplerate);
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av_log(avctx, AV_LOG_DEBUG, " Channels: %d\n", s->channels);
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av_log(avctx, AV_LOG_DEBUG, " Bits: %d\n", s->bps);
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2004-02-18 01:22:05 +00:00
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}
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2009-01-24 18:51:43 +00:00
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static void allocate_buffers(FLACContext *s)
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{
|
2004-02-18 01:22:05 +00:00
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int i;
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|
2004-02-18 01:49:30 +00:00
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assert(s->max_blocksize);
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2009-01-24 18:51:43 +00:00
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for (i = 0; i < s->channels; i++) {
|
2009-01-24 19:05:52 +00:00
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s->decoded[i] = av_realloc(s->decoded[i],
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sizeof(int32_t)*s->max_blocksize);
|
2004-02-18 01:49:30 +00:00
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}
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}
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|
2011-10-17 07:28:53 +00:00
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void avpriv_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
|
2008-05-02 21:34:34 +00:00
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const uint8_t *buffer)
|
2004-02-18 01:49:30 +00:00
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{
|
2008-05-02 21:29:49 +00:00
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GetBitContext gb;
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init_get_bits(&gb, buffer, FLAC_STREAMINFO_SIZE*8);
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|
2009-03-03 05:25:23 +00:00
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skip_bits(&gb, 16); /* skip min blocksize */
|
2008-05-02 21:29:49 +00:00
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s->max_blocksize = get_bits(&gb, 16);
|
2009-03-19 03:04:21 +00:00
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if (s->max_blocksize < FLAC_MIN_BLOCKSIZE) {
|
2009-03-03 05:53:38 +00:00
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av_log(avctx, AV_LOG_WARNING, "invalid max blocksize: %d\n",
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s->max_blocksize);
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s->max_blocksize = 16;
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}
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2004-02-18 01:22:05 +00:00
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|
2008-05-02 21:29:49 +00:00
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skip_bits(&gb, 24); /* skip min frame size */
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s->max_framesize = get_bits_long(&gb, 24);
|
2005-12-17 18:14:38 +00:00
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|
2008-05-02 21:29:49 +00:00
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s->samplerate = get_bits_long(&gb, 20);
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s->channels = get_bits(&gb, 3) + 1;
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s->bps = get_bits(&gb, 5) + 1;
|
2005-12-17 18:14:38 +00:00
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|
2008-05-02 21:29:49 +00:00
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avctx->channels = s->channels;
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avctx->sample_rate = s->samplerate;
|
2009-01-31 01:20:40 +00:00
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|
avctx->bits_per_raw_sample = s->bps;
|
2004-02-18 01:22:05 +00:00
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|
2009-01-25 02:27:02 +00:00
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s->samples = get_bits_long(&gb, 32) << 4;
|
2009-03-02 17:32:53 +00:00
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s->samples |= get_bits(&gb, 4);
|
2005-12-17 18:14:38 +00:00
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2009-03-02 17:32:53 +00:00
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skip_bits_long(&gb, 64); /* md5 sum */
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skip_bits_long(&gb, 64); /* md5 sum */
|
2005-12-17 18:14:38 +00:00
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2008-05-02 21:30:32 +00:00
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dump_headers(avctx, s);
|
2006-11-23 22:22:03 +00:00
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}
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|
2011-10-17 07:28:53 +00:00
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void avpriv_flac_parse_block_header(const uint8_t *block_header,
|
2009-03-06 01:25:11 +00:00
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int *last, int *type, int *size)
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{
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int tmp = bytestream_get_byte(&block_header);
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if (last)
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*last = tmp & 0x80;
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if (type)
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*type = tmp & 0x7F;
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if (size)
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|
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*size = bytestream_get_be24(&block_header);
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}
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|
2006-11-23 22:22:03 +00:00
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|
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/**
|
2009-03-05 00:56:09 +00:00
|
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* Parse the STREAMINFO from an inline header.
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* @param s the flac decoding context
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* @param buf input buffer, starting with the "fLaC" marker
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* @param buf_size buffer size
|
2009-03-04 00:52:18 +00:00
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* @return non-zero if metadata is invalid
|
2006-11-23 22:22:03 +00:00
|
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|
*/
|
2009-03-05 00:56:09 +00:00
|
|
|
static int parse_streaminfo(FLACContext *s, const uint8_t *buf, int buf_size)
|
2006-11-23 22:22:03 +00:00
|
|
|
{
|
2009-03-05 00:56:09 +00:00
|
|
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int metadata_type, metadata_size;
|
2006-11-23 22:22:03 +00:00
|
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|
2009-03-05 00:56:09 +00:00
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if (buf_size < FLAC_STREAMINFO_SIZE+8) {
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|
|
/* need more data */
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|
|
return 0;
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|
|
|
}
|
2011-10-17 07:28:53 +00:00
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|
avpriv_flac_parse_block_header(&buf[4], NULL, &metadata_type, &metadata_size);
|
2009-03-05 00:56:09 +00:00
|
|
|
if (metadata_type != FLAC_METADATA_TYPE_STREAMINFO ||
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|
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metadata_size != FLAC_STREAMINFO_SIZE) {
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|
|
return AVERROR_INVALIDDATA;
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|
|
|
}
|
2011-10-17 07:28:53 +00:00
|
|
|
avpriv_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s, &buf[8]);
|
2009-03-05 00:56:09 +00:00
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|
|
allocate_buffers(s);
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|
|
s->got_streaminfo = 1;
|
2006-11-23 22:22:03 +00:00
|
|
|
|
2009-03-05 00:56:09 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2006-11-23 22:22:03 +00:00
|
|
|
|
2009-03-05 00:56:09 +00:00
|
|
|
/**
|
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|
|
* Determine the size of an inline header.
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|
* @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;
|
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|
|
const uint8_t *buf_end = buf + buf_size;
|
2008-07-18 12:03:21 +00:00
|
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|
2009-03-05 00:56:09 +00:00
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|
buf += 4;
|
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|
do {
|
2011-09-13 19:13:44 +00:00
|
|
|
if (buf_end - buf < 4)
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|
|
return 0;
|
2011-10-17 07:28:53 +00:00
|
|
|
avpriv_flac_parse_block_header(buf, &metadata_last, NULL, &metadata_size);
|
2009-03-06 01:25:11 +00:00
|
|
|
buf += 4;
|
2011-09-13 19:13:44 +00:00
|
|
|
if (buf_end - buf < metadata_size) {
|
2009-03-05 00:56:09 +00:00
|
|
|
/* need more data in order to read the complete header */
|
|
|
|
return 0;
|
2009-03-04 00:53:04 +00:00
|
|
|
}
|
2009-03-05 00:56:09 +00:00
|
|
|
buf += metadata_size;
|
2009-03-04 00:53:04 +00:00
|
|
|
} while (!metadata_last);
|
2006-11-23 22:22:03 +00:00
|
|
|
|
2009-03-05 00:56:09 +00:00
|
|
|
return buf_size - (buf_end - buf);
|
2004-02-18 01:22:05 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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 18:51:43 +00:00
|
|
|
if (method_type > 1) {
|
2009-01-24 19:05:52 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal residual coding method %d\n",
|
|
|
|
method_type);
|
2004-02-18 01:22:05 +00:00
|
|
|
return -1;
|
2004-02-18 01:49:30 +00:00
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-02-18 01:22:05 +00:00
|
|
|
rice_order = get_bits(&s->gb, 4);
|
|
|
|
|
2004-02-18 01:49:30 +00:00
|
|
|
samples= s->blocksize >> rice_order;
|
2007-01-21 09:55:28 +00:00
|
|
|
if (pred_order > samples) {
|
2009-01-24 19:05:52 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid predictor order: %i > %i\n",
|
|
|
|
pred_order, samples);
|
2007-01-21 09:55:28 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2004-02-18 01:22:05 +00:00
|
|
|
|
2005-12-17 18:14:38 +00:00
|
|
|
sample=
|
2004-02-18 01:49:30 +00:00
|
|
|
i= pred_order;
|
2009-01-24 18:51:43 +00:00
|
|
|
for (partition = 0; partition < (1 << rice_order); partition++) {
|
2007-11-03 23:54:50 +00:00
|
|
|
tmp = get_bits(&s->gb, method_type == 0 ? 4 : 5);
|
2009-01-24 18:51:43 +00:00
|
|
|
if (tmp == (method_type == 0 ? 15 : 31)) {
|
2004-02-18 01:22:05 +00:00
|
|
|
tmp = get_bits(&s->gb, 5);
|
|
|
|
for (; i < samples; i++, sample++)
|
2009-03-03 02:19:01 +00:00
|
|
|
s->decoded[channel][sample] = get_sbits_long(&s->gb, tmp);
|
2009-01-24 18:51:43 +00:00
|
|
|
} else {
|
|
|
|
for (; i < samples; i++, sample++) {
|
2004-02-18 02:00:55 +00:00
|
|
|
s->decoded[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
|
2004-02-18 01:49:30 +00:00
|
|
|
}
|
2004-02-18 01:22:05 +00:00
|
|
|
}
|
2004-02-18 01:49:30 +00:00
|
|
|
i= 0;
|
2004-02-18 01:22:05 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2005-12-17 18:14:38 +00:00
|
|
|
}
|
2004-02-18 01:22:05 +00:00
|
|
|
|
|
|
|
static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order)
|
|
|
|
{
|
2007-09-30 02:12:03 +00:00
|
|
|
const int blocksize = s->blocksize;
|
|
|
|
int32_t *decoded = s->decoded[channel];
|
2012-02-13 07:24:00 +00:00
|
|
|
int a, b, c, d, i;
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-02-18 01:22:05 +00:00
|
|
|
/* warm up samples */
|
2009-01-24 18:51:43 +00:00
|
|
|
for (i = 0; i < pred_order; i++) {
|
2009-03-03 02:19:01 +00:00
|
|
|
decoded[i] = get_sbits_long(&s->gb, s->curr_bps);
|
2004-02-18 01:22:05 +00:00
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-02-18 01:22:05 +00:00
|
|
|
if (decode_residuals(s, channel, pred_order) < 0)
|
|
|
|
return -1;
|
|
|
|
|
2009-01-24 18:51:43 +00:00
|
|
|
if (pred_order > 0)
|
2008-05-04 01:08:40 +00:00
|
|
|
a = decoded[pred_order-1];
|
2009-01-24 18:51:43 +00:00
|
|
|
if (pred_order > 1)
|
2008-05-04 01:08:40 +00:00
|
|
|
b = a - decoded[pred_order-2];
|
2009-01-24 18:51:43 +00:00
|
|
|
if (pred_order > 2)
|
2008-05-04 01:08:40 +00:00
|
|
|
c = b - decoded[pred_order-2] + decoded[pred_order-3];
|
2009-01-24 18:51:43 +00:00
|
|
|
if (pred_order > 3)
|
2008-05-04 01:08:40 +00:00
|
|
|
d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
|
2007-09-30 02:12:03 +00:00
|
|
|
|
2009-01-24 18:51:43 +00:00
|
|
|
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 01:22:05 +00:00
|
|
|
}
|
2004-02-18 01:49:30 +00:00
|
|
|
|
2004-02-18 01:22:05 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order)
|
|
|
|
{
|
2006-06-21 00:21:26 +00:00
|
|
|
int i, j;
|
2004-02-18 01:22:05 +00:00
|
|
|
int coeff_prec, qlevel;
|
2009-08-19 21:59:36 +00:00
|
|
|
int coeffs[32];
|
2007-09-30 03:01:56 +00:00
|
|
|
int32_t *decoded = s->decoded[channel];
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-02-18 01:22:05 +00:00
|
|
|
/* warm up samples */
|
2009-01-24 18:51:43 +00:00
|
|
|
for (i = 0; i < pred_order; i++) {
|
2009-03-03 02:19:01 +00:00
|
|
|
decoded[i] = get_sbits_long(&s->gb, s->curr_bps);
|
2004-02-18 01:22:05 +00:00
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-02-18 01:22:05 +00:00
|
|
|
coeff_prec = get_bits(&s->gb, 4) + 1;
|
2009-01-24 18:51:43 +00:00
|
|
|
if (coeff_prec == 16) {
|
2009-01-24 16:03:17 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid coeff precision\n");
|
2004-02-18 01:22:05 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2004-02-18 01:49:30 +00:00
|
|
|
qlevel = get_sbits(&s->gb, 5);
|
2009-01-24 18:51:43 +00:00
|
|
|
if (qlevel < 0) {
|
2009-01-24 19:05:52 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "qlevel %d not supported, maybe buggy stream\n",
|
|
|
|
qlevel);
|
2004-02-18 04:10:52 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2009-01-24 18:51:43 +00:00
|
|
|
for (i = 0; i < pred_order; i++) {
|
2004-02-18 01:49:30 +00:00
|
|
|
coeffs[i] = get_sbits(&s->gb, coeff_prec);
|
2004-02-18 01:22:05 +00:00
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-02-18 01:22:05 +00:00
|
|
|
if (decode_residuals(s, channel, pred_order) < 0)
|
|
|
|
return -1;
|
|
|
|
|
2006-06-21 00:21:26 +00:00
|
|
|
if (s->bps > 16) {
|
|
|
|
int64_t sum;
|
2009-01-24 18:51:43 +00:00
|
|
|
for (i = pred_order; i < s->blocksize; i++) {
|
2006-06-21 00:21:26 +00:00
|
|
|
sum = 0;
|
|
|
|
for (j = 0; j < pred_order; j++)
|
2007-09-30 03:01:56 +00:00
|
|
|
sum += (int64_t)coeffs[j] * decoded[i-j-1];
|
|
|
|
decoded[i] += sum >> qlevel;
|
2006-06-21 00:21:26 +00:00
|
|
|
}
|
|
|
|
} else {
|
2009-01-24 18:51:43 +00:00
|
|
|
for (i = pred_order; i < s->blocksize-1; i += 2) {
|
2007-09-30 03:01:56 +00:00
|
|
|
int c;
|
|
|
|
int d = decoded[i-pred_order];
|
|
|
|
int s0 = 0, s1 = 0;
|
2009-01-24 18:51:43 +00:00
|
|
|
for (j = pred_order-1; j > 0; j--) {
|
2007-09-30 03:01:56 +00:00
|
|
|
c = coeffs[j];
|
2007-09-25 23:31:13 +00:00
|
|
|
s0 += c*d;
|
2007-09-30 03:01:56 +00:00
|
|
|
d = decoded[i-j];
|
|
|
|
s1 += c*d;
|
2007-09-25 23:31:13 +00:00
|
|
|
}
|
2007-09-30 03:01:56 +00:00
|
|
|
c = coeffs[0];
|
|
|
|
s0 += c*d;
|
|
|
|
d = decoded[i] += s0 >> qlevel;
|
|
|
|
s1 += c*d;
|
|
|
|
decoded[i+1] += s1 >> qlevel;
|
2007-09-25 23:31:13 +00:00
|
|
|
}
|
2009-01-24 18:51:43 +00:00
|
|
|
if (i < s->blocksize) {
|
2007-09-25 23:31:13 +00:00
|
|
|
int sum = 0;
|
2006-06-21 00:21:26 +00:00
|
|
|
for (j = 0; j < pred_order; j++)
|
2007-09-30 03:01:56 +00:00
|
|
|
sum += coeffs[j] * decoded[i-j-1];
|
|
|
|
decoded[i] += sum >> qlevel;
|
2006-06-21 00:21:26 +00:00
|
|
|
}
|
2004-02-18 01:22:05 +00:00
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-02-18 01:22:05 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int decode_subframe(FLACContext *s, int channel)
|
|
|
|
{
|
|
|
|
int type, wasted = 0;
|
|
|
|
int i, tmp;
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-02-18 01:22:05 +00:00
|
|
|
s->curr_bps = s->bps;
|
2009-01-24 18:51:43 +00:00
|
|
|
if (channel == 0) {
|
2009-03-21 00:47:04 +00:00
|
|
|
if (s->ch_mode == FLAC_CHMODE_RIGHT_SIDE)
|
2004-02-18 01:49:30 +00:00
|
|
|
s->curr_bps++;
|
2009-01-24 18:51:43 +00:00
|
|
|
} else {
|
2009-03-21 00:47:04 +00:00
|
|
|
if (s->ch_mode == FLAC_CHMODE_LEFT_SIDE || s->ch_mode == FLAC_CHMODE_MID_SIDE)
|
2004-02-18 01:49:30 +00:00
|
|
|
s->curr_bps++;
|
|
|
|
}
|
|
|
|
|
2009-01-24 18:51:43 +00:00
|
|
|
if (get_bits1(&s->gb)) {
|
2005-09-05 09:28:46 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid subframe padding\n");
|
2004-02-18 01:22:05 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
type = get_bits(&s->gb, 6);
|
2009-01-24 15:46:19 +00:00
|
|
|
|
2009-01-24 18:51:43 +00:00
|
|
|
if (get_bits1(&s->gb)) {
|
2012-02-15 17:52:11 +00:00
|
|
|
int left = get_bits_left(&s->gb);
|
2004-02-18 01:22:05 +00:00
|
|
|
wasted = 1;
|
2012-02-15 17:52:11 +00:00
|
|
|
if ( left < 0 ||
|
|
|
|
(left < s->curr_bps && !show_bits_long(&s->gb, left)) ||
|
|
|
|
!show_bits_long(&s->gb, s->curr_bps)) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
|
|
"Invalid number of wasted bits > available bits (%d) - left=%d\n",
|
|
|
|
s->curr_bps, left);
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
2004-02-18 01:22:05 +00:00
|
|
|
while (!get_bits1(&s->gb))
|
|
|
|
wasted++;
|
|
|
|
s->curr_bps -= wasted;
|
|
|
|
}
|
2009-03-04 23:10:40 +00:00
|
|
|
if (s->curr_bps > 32) {
|
2009-06-29 19:07:04 +00:00
|
|
|
av_log_missing_feature(s->avctx, "decorrelated bit depth > 32", 0);
|
2009-03-04 23:10:40 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2009-01-24 15:46:19 +00:00
|
|
|
|
2004-02-18 01:49:30 +00:00
|
|
|
//FIXME use av_log2 for types
|
2009-01-24 18:51:43 +00:00
|
|
|
if (type == 0) {
|
2009-03-03 02:19:01 +00:00
|
|
|
tmp = get_sbits_long(&s->gb, s->curr_bps);
|
2004-02-18 01:22:05 +00:00
|
|
|
for (i = 0; i < s->blocksize; i++)
|
|
|
|
s->decoded[channel][i] = tmp;
|
2009-01-24 18:51:43 +00:00
|
|
|
} else if (type == 1) {
|
2004-02-18 01:22:05 +00:00
|
|
|
for (i = 0; i < s->blocksize; i++)
|
2009-03-03 02:19:01 +00:00
|
|
|
s->decoded[channel][i] = get_sbits_long(&s->gb, s->curr_bps);
|
2009-01-24 18:51:43 +00:00
|
|
|
} else if ((type >= 8) && (type <= 12)) {
|
2004-02-18 01:22:05 +00:00
|
|
|
if (decode_subframe_fixed(s, channel, type & ~0x8) < 0)
|
|
|
|
return -1;
|
2009-01-24 18:51:43 +00:00
|
|
|
} else if (type >= 32) {
|
2004-02-18 01:22:05 +00:00
|
|
|
if (decode_subframe_lpc(s, channel, (type & ~0x20)+1) < 0)
|
|
|
|
return -1;
|
2009-01-24 18:51:43 +00:00
|
|
|
} else {
|
2005-09-05 09:28:46 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid coding type\n");
|
2004-02-18 01:22:05 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2009-01-24 18:51:43 +00:00
|
|
|
if (wasted) {
|
2004-02-18 01:22:05 +00:00
|
|
|
int i;
|
|
|
|
for (i = 0; i < s->blocksize; i++)
|
|
|
|
s->decoded[channel][i] <<= wasted;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-03-24 01:17:55 +00:00
|
|
|
static int decode_frame(FLACContext *s)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
GetBitContext *gb = &s->gb;
|
|
|
|
FLACFrameInfo fi;
|
|
|
|
|
2010-12-07 14:00:38 +00:00
|
|
|
if (ff_flac_decode_frame_header(s->avctx, gb, &fi, 0)) {
|
2009-03-24 01:17:55 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid frame header\n");
|
2004-02-18 04:10:52 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2010-10-02 20:37:43 +00:00
|
|
|
if (s->channels && fi.channels != s->channels) {
|
2009-03-22 23:19:49 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "switching channel layout mid-stream "
|
|
|
|
"is not supported\n");
|
|
|
|
return -1;
|
|
|
|
}
|
2010-10-02 20:37:43 +00:00
|
|
|
s->channels = s->avctx->channels = fi.channels;
|
2009-03-24 01:17:55 +00:00
|
|
|
s->ch_mode = fi.ch_mode;
|
2009-03-22 23:19:49 +00:00
|
|
|
|
2010-10-02 20:37:43 +00:00
|
|
|
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) {
|
2009-03-22 23:19:49 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "switching bps mid-stream is not "
|
|
|
|
"supported\n");
|
|
|
|
return -1;
|
|
|
|
}
|
2010-10-02 20:37:43 +00:00
|
|
|
s->bps = s->avctx->bits_per_raw_sample = fi.bps;
|
|
|
|
|
2009-03-22 23:19:49 +00:00
|
|
|
if (s->bps > 16) {
|
2010-11-12 11:04:40 +00:00
|
|
|
s->avctx->sample_fmt = AV_SAMPLE_FMT_S32;
|
2009-03-22 23:19:49 +00:00
|
|
|
s->sample_shift = 32 - s->bps;
|
|
|
|
s->is32 = 1;
|
|
|
|
} else {
|
2010-11-12 11:04:40 +00:00
|
|
|
s->avctx->sample_fmt = AV_SAMPLE_FMT_S16;
|
2009-03-22 23:19:49 +00:00
|
|
|
s->sample_shift = 16 - s->bps;
|
|
|
|
s->is32 = 0;
|
|
|
|
}
|
|
|
|
|
2010-10-02 20:37:43 +00:00
|
|
|
if (!s->max_blocksize)
|
|
|
|
s->max_blocksize = FLAC_MAX_BLOCKSIZE;
|
2009-03-24 01:17:55 +00:00
|
|
|
if (fi.blocksize > s->max_blocksize) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", fi.blocksize,
|
2009-03-22 23:19:49 +00:00
|
|
|
s->max_blocksize);
|
|
|
|
return -1;
|
|
|
|
}
|
2009-03-24 01:17:55 +00:00
|
|
|
s->blocksize = fi.blocksize;
|
2009-03-22 23:19:49 +00:00
|
|
|
|
2010-10-02 20:37:43 +00:00
|
|
|
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 01:17:55 +00:00
|
|
|
if (fi.samplerate == 0) {
|
|
|
|
fi.samplerate = s->samplerate;
|
2010-10-02 20:37:43 +00:00
|
|
|
} else if (s->samplerate && fi.samplerate != s->samplerate) {
|
2009-03-22 23:19:49 +00:00
|
|
|
av_log(s->avctx, AV_LOG_WARNING, "sample rate changed from %d to %d\n",
|
2009-03-24 01:17:55 +00:00
|
|
|
s->samplerate, fi.samplerate);
|
2009-03-22 23:19:49 +00:00
|
|
|
}
|
2009-03-24 01:17:55 +00:00
|
|
|
s->samplerate = s->avctx->sample_rate = fi.samplerate;
|
2004-02-18 01:22:05 +00:00
|
|
|
|
2010-10-02 20:37:43 +00:00
|
|
|
if (!s->got_streaminfo) {
|
|
|
|
allocate_buffers(s);
|
|
|
|
s->got_streaminfo = 1;
|
|
|
|
dump_headers(s->avctx, (FLACStreaminfo *)s);
|
|
|
|
}
|
|
|
|
|
2008-05-02 21:34:34 +00:00
|
|
|
// dump_headers(s->avctx, (FLACStreaminfo *)s);
|
2004-02-18 01:22:05 +00:00
|
|
|
|
|
|
|
/* subframes */
|
2009-01-24 18:51:43 +00:00
|
|
|
for (i = 0; i < s->channels; i++) {
|
2004-02-18 01:22:05 +00:00
|
|
|
if (decode_subframe(s, i) < 0)
|
|
|
|
return -1;
|
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2009-03-22 18:52:15 +00:00
|
|
|
align_get_bits(gb);
|
2004-02-18 01:22:05 +00:00
|
|
|
|
|
|
|
/* frame footer */
|
2009-03-22 18:52:15 +00:00
|
|
|
skip_bits(gb, 16); /* data crc */
|
2004-02-18 01:22:05 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-09-06 16:17:45 +00:00
|
|
|
static int flac_decode_frame(AVCodecContext *avctx, void *data,
|
|
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
2004-02-18 01:22:05 +00:00
|
|
|
{
|
2009-04-07 15:59:50 +00:00
|
|
|
const uint8_t *buf = avpkt->data;
|
|
|
|
int buf_size = avpkt->size;
|
2004-02-18 01:22:05 +00:00
|
|
|
FLACContext *s = avctx->priv_data;
|
2010-12-07 14:57:02 +00:00
|
|
|
int i, j = 0, bytes_read = 0;
|
2011-09-06 16:17:45 +00:00
|
|
|
int16_t *samples_16;
|
|
|
|
int32_t *samples_32;
|
|
|
|
int ret;
|
2007-01-14 23:50:06 +00:00
|
|
|
|
2011-09-06 16:17:45 +00:00
|
|
|
*got_frame_ptr = 0;
|
2004-02-18 01:22:05 +00:00
|
|
|
|
2009-01-24 18:51:43 +00:00
|
|
|
if (s->max_framesize == 0) {
|
2010-10-02 20:37:43 +00:00
|
|
|
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 01:49:30 +00:00
|
|
|
}
|
2004-02-18 01:22:05 +00:00
|
|
|
|
2009-03-04 23:55:10 +00:00
|
|
|
/* check that there is at least the smallest decodable amount of data.
|
2009-03-05 04:40:42 +00:00
|
|
|
this amount corresponds to the smallest valid FLAC frame possible.
|
|
|
|
FF F8 69 02 00 00 9A 00 00 34 46 */
|
2010-12-07 14:58:34 +00:00
|
|
|
if (buf_size < FLAC_MIN_FRAME_SIZE)
|
2010-12-07 14:57:02 +00:00
|
|
|
return buf_size;
|
2009-03-04 23:55:10 +00:00
|
|
|
|
2009-03-04 00:52:18 +00:00
|
|
|
/* check for inline header */
|
2009-03-05 00:56:09 +00:00
|
|
|
if (AV_RB32(buf) == MKBETAG('f','L','a','C')) {
|
|
|
|
if (!s->got_streaminfo && parse_streaminfo(s, buf, buf_size)) {
|
2009-03-04 00:52:18 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid header\n");
|
|
|
|
return -1;
|
|
|
|
}
|
2010-12-07 14:57:02 +00:00
|
|
|
return get_metadata_size(buf, buf_size);
|
2009-01-24 16:13:21 +00:00
|
|
|
}
|
2009-03-05 01:15:38 +00:00
|
|
|
|
|
|
|
/* decode frame */
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
2009-03-22 20:19:20 +00:00
|
|
|
if (decode_frame(s) < 0) {
|
2009-01-24 16:13:21 +00:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
|
|
|
|
return -1;
|
|
|
|
}
|
2009-03-05 01:23:53 +00:00
|
|
|
bytes_read = (get_bits_count(&s->gb)+7)/8;
|
2004-02-18 01:49:30 +00:00
|
|
|
|
2011-09-06 16:17:45 +00:00
|
|
|
/* 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 20:19:20 +00:00
|
|
|
}
|
2011-09-06 16:17:45 +00:00
|
|
|
samples_16 = (int16_t *)s->frame.data[0];
|
|
|
|
samples_32 = (int32_t *)s->frame.data[0];
|
2009-03-22 20:19:20 +00:00
|
|
|
|
2006-07-07 22:41:43 +00:00
|
|
|
#define DECORRELATE(left, right)\
|
|
|
|
assert(s->channels == 2);\
|
2009-01-24 18:51:43 +00:00
|
|
|
for (i = 0; i < s->blocksize; i++) {\
|
2006-07-07 22:41:43 +00:00
|
|
|
int a= s->decoded[0][i];\
|
|
|
|
int b= s->decoded[1][i];\
|
2009-01-31 01:20:40 +00:00
|
|
|
if (s->is32) {\
|
|
|
|
*samples_32++ = (left) << s->sample_shift;\
|
|
|
|
*samples_32++ = (right) << s->sample_shift;\
|
|
|
|
} else {\
|
|
|
|
*samples_16++ = (left) << s->sample_shift;\
|
|
|
|
*samples_16++ = (right) << s->sample_shift;\
|
|
|
|
}\
|
2006-07-07 22:41:43 +00:00
|
|
|
}\
|
|
|
|
break;
|
|
|
|
|
2009-03-21 00:47:04 +00:00
|
|
|
switch (s->ch_mode) {
|
2009-03-21 00:44:42 +00:00
|
|
|
case FLAC_CHMODE_INDEPENDENT:
|
2009-01-24 18:51:43 +00:00
|
|
|
for (j = 0; j < s->blocksize; j++) {
|
2009-01-31 01:20:40 +00:00
|
|
|
for (i = 0; i < s->channels; i++) {
|
|
|
|
if (s->is32)
|
|
|
|
*samples_32++ = s->decoded[i][j] << s->sample_shift;
|
|
|
|
else
|
|
|
|
*samples_16++ = s->decoded[i][j] << s->sample_shift;
|
|
|
|
}
|
2009-01-24 18:51:43 +00:00
|
|
|
}
|
|
|
|
break;
|
2009-03-21 00:44:42 +00:00
|
|
|
case FLAC_CHMODE_LEFT_SIDE:
|
2009-01-24 18:51:43 +00:00
|
|
|
DECORRELATE(a,a-b)
|
2009-03-21 00:44:42 +00:00
|
|
|
case FLAC_CHMODE_RIGHT_SIDE:
|
2009-01-24 18:51:43 +00:00
|
|
|
DECORRELATE(a+b,b)
|
2009-03-21 00:44:42 +00:00
|
|
|
case FLAC_CHMODE_MID_SIDE:
|
2009-01-24 18:51:43 +00:00
|
|
|
DECORRELATE( (a-=b>>1) + b, a)
|
2004-02-18 01:22:05 +00:00
|
|
|
}
|
|
|
|
|
2009-03-04 23:24:44 +00:00
|
|
|
if (bytes_read > buf_size) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", bytes_read - buf_size);
|
2004-02-18 01:49:30 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2010-12-07 14:57:02 +00:00
|
|
|
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 01:22:05 +00:00
|
|
|
|
2011-09-06 16:17:45 +00:00
|
|
|
*got_frame_ptr = 1;
|
|
|
|
*(AVFrame *)data = s->frame;
|
|
|
|
|
2010-12-07 14:57:02 +00:00
|
|
|
return bytes_read;
|
2004-02-18 01:22:05 +00:00
|
|
|
}
|
|
|
|
|
2008-03-21 03:11:20 +00:00
|
|
|
static av_cold int flac_decode_close(AVCodecContext *avctx)
|
2004-02-18 01:22:05 +00:00
|
|
|
{
|
|
|
|
FLACContext *s = avctx->priv_data;
|
|
|
|
int i;
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2009-01-24 18:51:43 +00:00
|
|
|
for (i = 0; i < s->channels; i++) {
|
2004-02-18 01:49:30 +00:00
|
|
|
av_freep(&s->decoded[i]);
|
2004-02-18 01:22:05 +00:00
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-02-18 01:22:05 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-01-25 21:40:11 +00:00
|
|
|
AVCodec ff_flac_decoder = {
|
2011-07-17 10:54:31 +00:00
|
|
|
.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 16:17:45 +00:00
|
|
|
.capabilities = CODEC_CAP_DR1,
|
2012-04-06 16:19:39 +00:00
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
|
2004-02-18 01:22:05 +00:00
|
|
|
};
|