mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 10484 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
parent
48fe9238a0
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bf4a1f17ee
12 changed files with 1328 additions and 4 deletions
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/*
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* Monkey's Audio lossless audio decoder |
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* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org> |
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* based upon libdemac from Dave Chapman. |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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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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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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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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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#define ALT_BITSTREAM_READER_LE |
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#include "avcodec.h" |
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#include "dsputil.h" |
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#include "bitstream.h" |
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#include "bytestream.h" |
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/**
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* @file apedec.c |
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* Monkey's Audio lossless audio decoder |
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*/ |
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#define BLOCKS_PER_LOOP 4608 |
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#define MAX_CHANNELS 2 |
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#define MAX_BYTESPERSAMPLE 3 |
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#define APE_FRAMECODE_MONO_SILENCE 1 |
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#define APE_FRAMECODE_STEREO_SILENCE 3 |
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#define APE_FRAMECODE_PSEUDO_STEREO 4 |
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#define HISTORY_SIZE 512 |
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#define PREDICTOR_ORDER 8 |
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/** Total size of all predictor histories */ |
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#define PREDICTOR_SIZE 50 |
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#define YDELAYA (18 + PREDICTOR_ORDER*4) |
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#define YDELAYB (18 + PREDICTOR_ORDER*3) |
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#define XDELAYA (18 + PREDICTOR_ORDER*2) |
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#define XDELAYB (18 + PREDICTOR_ORDER) |
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#define YADAPTCOEFFSA 18 |
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#define XADAPTCOEFFSA 14 |
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#define YADAPTCOEFFSB 10 |
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#define XADAPTCOEFFSB 5 |
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/**
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* Possible compression levels |
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* @{ |
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*/ |
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enum APECompressionLevel { |
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COMPRESSION_LEVEL_FAST = 1000, |
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COMPRESSION_LEVEL_NORMAL = 2000, |
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COMPRESSION_LEVEL_HIGH = 3000, |
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COMPRESSION_LEVEL_EXTRA_HIGH = 4000, |
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COMPRESSION_LEVEL_INSANE = 5000 |
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}; |
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/** @} */ |
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#define APE_FILTER_LEVELS 3 |
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/** Filter orders depending on compression level */ |
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static const uint16_t ape_filter_orders[5][APE_FILTER_LEVELS] = { |
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{ 0, 0, 0 }, |
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{ 16, 0, 0 }, |
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{ 64, 0, 0 }, |
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{ 32, 256, 0 }, |
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{ 16, 256, 1280 } |
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}; |
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/** Filter fraction bits depending on compression level */ |
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static const uint16_t ape_filter_fracbits[5][APE_FILTER_LEVELS] = { |
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{ 0, 0, 0 }, |
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{ 11, 0, 0 }, |
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{ 11, 0, 0 }, |
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{ 10, 13, 0 }, |
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{ 11, 13, 15 } |
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}; |
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/** Filters applied to the decoded data */ |
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typedef struct APEFilter { |
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int16_t *coeffs; ///< actual coefficients used in filtering
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int16_t *adaptcoeffs; ///< adaptive filter coefficients used for correcting of actual filter coefficients
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int16_t *historybuffer; ///< filter memory
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int16_t *delay; ///< filtered values
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int avg; |
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} APEFilter; |
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typedef struct APERice { |
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uint32_t k; |
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uint32_t ksum; |
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} APERice; |
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typedef struct APERangecoder { |
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uint32_t low; ///< low end of interval
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uint32_t range; ///< length of interval
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uint32_t help; ///< bytes_to_follow resp. intermediate value
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unsigned int buffer; ///< buffer for input/output
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} APERangecoder; |
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/** Filter histories */ |
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typedef struct APEPredictor { |
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int32_t *buf; |
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int32_t lastA[2]; |
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int32_t filterA[2]; |
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int32_t filterB[2]; |
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int32_t coeffsA[2][4]; ///< adaption coefficients
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int32_t coeffsB[2][5]; ///< adaption coefficients
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int32_t historybuffer[HISTORY_SIZE + PREDICTOR_SIZE]; |
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} APEPredictor; |
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/** Decoder context */ |
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typedef struct APEContext { |
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AVCodecContext *avctx; |
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DSPContext dsp; |
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int channels; |
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int samples; ///< samples left to decode in current frame
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int fileversion; ///< codec version, very important in decoding process
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int compression_level; ///< compression levels
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int fset; ///< which filter set to use (calculated from compression level)
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int flags; ///< global decoder flags
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uint32_t CRC; ///< frame CRC
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int frameflags; ///< frame flags
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int currentframeblocks; ///< samples (per channel) in current frame
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int blocksdecoded; ///< count of decoded samples in current frame
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APEPredictor predictor; ///< predictor used for final reconstruction
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int32_t decoded0[BLOCKS_PER_LOOP]; ///< decoded data for the first channel
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int32_t decoded1[BLOCKS_PER_LOOP]; ///< decoded data for the second channel
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int16_t* filterbuf[APE_FILTER_LEVELS]; ///< filter memory
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APERangecoder rc; ///< rangecoder used to decode actual values
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APERice riceX; ///< rice code parameters for the second channel
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APERice riceY; ///< rice code parameters for the first channel
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APEFilter filters[APE_FILTER_LEVELS][2]; ///< filters used for reconstruction
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uint8_t *data; ///< current frame data
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uint8_t *data_end; ///< frame data end
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uint8_t *ptr; ///< current position in frame data
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uint8_t *last_ptr; ///< position where last 4608-sample block ended
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} APEContext; |
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// TODO: dsputilize
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static inline void vector_add(int16_t * v1, int16_t * v2, int order) |
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{ |
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while (order--) |
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*v1++ += *v2++; |
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} |
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// TODO: dsputilize
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static inline void vector_sub(int16_t * v1, int16_t * v2, int order) |
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{ |
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while (order--) |
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*v1++ -= *v2++; |
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} |
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// TODO: dsputilize
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static inline int32_t scalarproduct(int16_t * v1, int16_t * v2, int order) |
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{ |
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int res = 0; |
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while (order--) |
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res += *v1++ * *v2++; |
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return res; |
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} |
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static int ape_decode_init(AVCodecContext * avctx) |
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{ |
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APEContext *s = avctx->priv_data; |
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int i; |
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if (avctx->extradata_size != 6) { |
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av_log(avctx, AV_LOG_ERROR, "Incorrect extradata\n"); |
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return -1; |
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} |
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if (avctx->bits_per_sample != 16) { |
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av_log(avctx, AV_LOG_ERROR, "Only 16-bit samples are supported\n"); |
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return -1; |
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} |
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if (avctx->channels > 2) { |
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av_log(avctx, AV_LOG_ERROR, "Only mono and stereo is supported\n"); |
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return -1; |
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} |
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s->avctx = avctx; |
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s->channels = avctx->channels; |
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s->fileversion = AV_RL16(avctx->extradata); |
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s->compression_level = AV_RL16(avctx->extradata + 2); |
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s->flags = AV_RL16(avctx->extradata + 4); |
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av_log(avctx, AV_LOG_DEBUG, "Compression Level: %d - Flags: %d\n", s->compression_level, s->flags); |
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if (s->compression_level % 1000 || s->compression_level > COMPRESSION_LEVEL_INSANE) { |
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av_log(avctx, AV_LOG_ERROR, "Incorrect compression level %d\n", s->compression_level); |
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return -1; |
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} |
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s->fset = s->compression_level / 1000 - 1; |
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for (i = 0; i < APE_FILTER_LEVELS; i++) { |
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if (!ape_filter_orders[s->fset][i]) |
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break; |
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s->filterbuf[i] = av_malloc((ape_filter_orders[s->fset][i] * 3 + HISTORY_SIZE) * 4); |
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} |
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dsputil_init(&s->dsp, avctx); |
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return 0; |
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} |
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static int ape_decode_close(AVCodecContext * avctx) |
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{ |
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APEContext *s = avctx->priv_data; |
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int i; |
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for (i = 0; i < APE_FILTER_LEVELS; i++) |
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av_freep(&s->filterbuf[i]); |
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return 0; |
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} |
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/**
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* @defgroup rangecoder APE range decoder |
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* @{ |
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*/ |
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#define CODE_BITS 32 |
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#define TOP_VALUE ((unsigned int)1 << (CODE_BITS-1)) |
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#define SHIFT_BITS (CODE_BITS - 9) |
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#define EXTRA_BITS ((CODE_BITS-2) % 8 + 1) |
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#define BOTTOM_VALUE (TOP_VALUE >> 8) |
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/** Start the decoder */ |
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static inline void range_start_decoding(APEContext * ctx) |
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{ |
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ctx->rc.buffer = bytestream_get_byte(&ctx->ptr); |
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ctx->rc.low = ctx->rc.buffer >> (8 - EXTRA_BITS); |
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ctx->rc.range = (uint32_t) 1 << EXTRA_BITS; |
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} |
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/** Perform normalization */ |
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static inline void range_dec_normalize(APEContext * ctx) |
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{ |
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while (ctx->rc.range <= BOTTOM_VALUE) { |
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ctx->rc.buffer = (ctx->rc.buffer << 8) | bytestream_get_byte(&ctx->ptr); |
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ctx->rc.low = (ctx->rc.low << 8) | ((ctx->rc.buffer >> 1) & 0xFF); |
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ctx->rc.range <<= 8; |
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} |
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} |
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/**
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* Calculate culmulative frequency for next symbol. Does NO update! |
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* @param tot_f is the total frequency or (code_value)1<<shift |
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* @return the culmulative frequency |
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*/ |
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static inline int range_decode_culfreq(APEContext * ctx, int tot_f) |
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{ |
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range_dec_normalize(ctx); |
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ctx->rc.help = ctx->rc.range / tot_f; |
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return ctx->rc.low / ctx->rc.help; |
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} |
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/**
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* Decode value with given size in bits |
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* @param shift number of bits to decode |
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*/ |
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static inline int range_decode_culshift(APEContext * ctx, int shift) |
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{ |
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range_dec_normalize(ctx); |
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ctx->rc.help = ctx->rc.range >> shift; |
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return ctx->rc.low / ctx->rc.help; |
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} |
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/**
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* Update decoding state |
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* @param sy_f the interval length (frequency of the symbol) |
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* @param lt_f the lower end (frequency sum of < symbols) |
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*/ |
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static inline void range_decode_update(APEContext * ctx, int sy_f, int lt_f) |
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{ |
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ctx->rc.low -= ctx->rc.help * lt_f; |
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ctx->rc.range = ctx->rc.help * sy_f; |
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} |
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/** Decode n bits (n <= 16) without modelling */ |
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static inline int range_decode_bits(APEContext * ctx, int n) |
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{ |
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int sym = range_decode_culshift(ctx, n); |
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range_decode_update(ctx, 1, sym); |
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return sym; |
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} |
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#define MODEL_ELEMENTS 64 |
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/**
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* Fixed probabilities for symbols in Monkey Audio version 3.97 |
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*/ |
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static const uint32_t counts_3970[65] = { |
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0, 14824, 28224, 39348, 47855, 53994, 58171, 60926, |
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62682, 63786, 64463, 64878, 65126, 65276, 65365, 65419, |
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65450, 65469, 65480, 65487, 65491, 65493, 65494, 65495, |
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65496, 65497, 65498, 65499, 65500, 65501, 65502, 65503, |
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65504, 65505, 65506, 65507, 65508, 65509, 65510, 65511, |
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65512, 65513, 65514, 65515, 65516, 65517, 65518, 65519, |
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65520, 65521, 65522, 65523, 65524, 65525, 65526, 65527, |
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65528, 65529, 65530, 65531, 65532, 65533, 65534, 65535, |
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65536 |
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}; |
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/**
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* Probability ranges for symbols in Monkey Audio version 3.97 |
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*/ |
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static const uint16_t counts_diff_3970[64] = { |
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14824, 13400, 11124, 8507, 6139, 4177, 2755, 1756, |
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1104, 677, 415, 248, 150, 89, 54, 31, |
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19, 11, 7, 4, 2, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1 |
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}; |
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/**
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* Fixed probabilities for symbols in Monkey Audio version 3.98 |
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*/ |
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static const uint32_t counts_3980[65] = { |
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0, 19578, 36160, 48417, 56323, 60899, 63265, 64435, |
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64971, 65232, 65351, 65416, 65447, 65466, 65476, 65482, |
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65485, 65488, 65490, 65491, 65492, 65493, 65494, 65495, |
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65496, 65497, 65498, 65499, 65500, 65501, 65502, 65503, |
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65504, 65505, 65506, 65507, 65508, 65509, 65510, 65511, |
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65512, 65513, 65514, 65515, 65516, 65517, 65518, 65519, |
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65520, 65521, 65522, 65523, 65524, 65525, 65526, 65527, |
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65528, 65529, 65530, 65531, 65532, 65533, 65534, 65535, |
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65536 |
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}; |
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/**
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* Probability ranges for symbols in Monkey Audio version 3.98 |
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*/ |
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static const uint16_t counts_diff_3980[64] = { |
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19578, 16582, 12257, 7906, 4576, 2366, 1170, 536, |
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261, 119, 65, 31, 19, 10, 6, 3, |
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3, 2, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1, |
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1, 1, 1, 1, 1, 1, 1, 1 |
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}; |
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/**
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* Decode symbol |
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* @param counts probability range start position |
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* @param count_diffs probability range widths |
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*/ |
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static inline int range_get_symbol(APEContext * ctx, |
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const uint32_t counts[], |
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const uint16_t counts_diff[]) |
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{ |
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int symbol, cf; |
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cf = range_decode_culshift(ctx, 16); |
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/* figure out the symbol inefficiently; a binary search would be much better */ |
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for (symbol = 0; counts[symbol + 1] <= cf; symbol++); |
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range_decode_update(ctx, counts_diff[symbol], counts[symbol]); |
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return symbol; |
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} |
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/** @} */ // group rangecoder
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static inline void update_rice(APERice *rice, int x) |
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{ |
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rice->ksum += ((x + 1) / 2) - ((rice->ksum + 16) >> 5); |
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if (rice->k == 0) |
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rice->k = 1; |
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else if (rice->ksum < (1 << (rice->k + 4))) |
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rice->k--; |
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else if (rice->ksum >= (1 << (rice->k + 5))) |
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rice->k++; |
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} |
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static inline int ape_decode_value(APEContext * ctx, APERice *rice) |
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{ |
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int x, overflow; |
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if (ctx->fileversion < 3980) { |
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int tmpk; |
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overflow = range_get_symbol(ctx, counts_3970, counts_diff_3970); |
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if (overflow == (MODEL_ELEMENTS - 1)) { |
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tmpk = range_decode_bits(ctx, 5); |
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overflow = 0; |
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} else |
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tmpk = (rice->k < 1) ? 0 : rice->k - 1; |
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if (tmpk <= 16) |
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x = range_decode_bits(ctx, tmpk); |
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else { |
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x = range_decode_bits(ctx, 16); |
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x |= (range_decode_bits(ctx, tmpk - 16) << 16); |
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} |
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x += overflow << tmpk; |
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} else { |
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int base, pivot; |
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pivot = rice->ksum >> 5; |
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if (pivot == 0) |
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pivot = 1; |
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overflow = range_get_symbol(ctx, counts_3980, counts_diff_3980); |
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if (overflow == (MODEL_ELEMENTS - 1)) { |
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overflow = range_decode_bits(ctx, 16) << 16; |
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overflow |= range_decode_bits(ctx, 16); |
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} |
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base = range_decode_culfreq(ctx, pivot); |
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range_decode_update(ctx, 1, base); |
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x = base + overflow * pivot; |
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} |
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update_rice(rice, x); |
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/* Convert to signed */ |
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if (x & 1) |
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return (x >> 1) + 1; |
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else |
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return -(x >> 1); |
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} |
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static void entropy_decode(APEContext * ctx, int blockstodecode, int stereo) |
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{ |
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int32_t *decoded0 = ctx->decoded0; |
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int32_t *decoded1 = ctx->decoded1; |
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ctx->blocksdecoded = blockstodecode; |
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if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) { |
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/* We are pure silence, just memset the output buffer. */ |
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memset(decoded0, 0, blockstodecode * sizeof(int32_t)); |
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memset(decoded1, 0, blockstodecode * sizeof(int32_t)); |
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} else { |
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while (blockstodecode--) { |
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*decoded0++ = ape_decode_value(ctx, &ctx->riceY); |
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if (stereo) |
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*decoded1++ = ape_decode_value(ctx, &ctx->riceX); |
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} |
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} |
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if (ctx->blocksdecoded == ctx->currentframeblocks) |
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range_dec_normalize(ctx); /* normalize to use up all bytes */ |
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} |
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static void init_entropy_decoder(APEContext * ctx) |
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{ |
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/* Read the CRC */ |
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ctx->CRC = bytestream_get_be32(&ctx->ptr); |
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/* Read the frame flags if they exist */ |
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ctx->frameflags = 0; |
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if ((ctx->fileversion > 3820) && (ctx->CRC & 0x80000000)) { |
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ctx->CRC &= ~0x80000000; |
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ctx->frameflags = bytestream_get_be32(&ctx->ptr); |
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} |
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/* Keep a count of the blocks decoded in this frame */ |
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ctx->blocksdecoded = 0; |
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/* Initialise the rice structs */ |
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ctx->riceX.k = 10; |
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ctx->riceX.ksum = (1 << ctx->riceX.k) * 16; |
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ctx->riceY.k = 10; |
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ctx->riceY.ksum = (1 << ctx->riceY.k) * 16; |
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/* The first 8 bits of input are ignored. */ |
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ctx->ptr++; |
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range_start_decoding(ctx); |
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} |
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static const int32_t initial_coeffs[4] = { |
||||
360, 317, -109, 98 |
||||
}; |
||||
|
||||
static void init_predictor_decoder(APEContext * ctx) |
||||
{ |
||||
APEPredictor *p = &ctx->predictor; |
||||
|
||||
/* Zero the history buffers */ |
||||
memset(p->historybuffer, 0, PREDICTOR_SIZE * sizeof(int32_t)); |
||||
p->buf = p->historybuffer; |
||||
|
||||
/* Initialise and zero the co-efficients */ |
||||
memcpy(p->coeffsA[0], initial_coeffs, sizeof(initial_coeffs)); |
||||
memcpy(p->coeffsA[1], initial_coeffs, sizeof(initial_coeffs)); |
||||
memset(p->coeffsB, 0, sizeof(p->coeffsB)); |
||||
|
||||
p->filterA[0] = p->filterA[1] = 0; |
||||
p->filterB[0] = p->filterB[1] = 0; |
||||
p->lastA[0] = p->lastA[1] = 0; |
||||
} |
||||
|
||||
/** Get inverse sign of integer (-1 for positive, 1 for negative and 0 for zero) */ |
||||
static inline int APESIGN(int32_t x) { |
||||
return (x < 0) - (x > 0); |
||||
} |
||||
|
||||
static int predictor_update_filter(APEPredictor *p, const int decoded, const int filter, const int delayA, const int delayB, const int adaptA, const int adaptB) |
||||
{ |
||||
int32_t predictionA, predictionB; |
||||
|
||||
p->buf[delayA] = p->lastA[filter]; |
||||
p->buf[adaptA] = APESIGN(p->buf[delayA]); |
||||
p->buf[delayA - 1] = p->buf[delayA] - p->buf[delayA - 1]; |
||||
p->buf[adaptA - 1] = APESIGN(p->buf[delayA - 1]); |
||||
|
||||
predictionA = p->buf[delayA ] * p->coeffsA[filter][0] + |
||||
p->buf[delayA - 1] * p->coeffsA[filter][1] + |
||||
p->buf[delayA - 2] * p->coeffsA[filter][2] + |
||||
p->buf[delayA - 3] * p->coeffsA[filter][3]; |
||||
|
||||
/* Apply a scaled first-order filter compression */ |
||||
p->buf[delayB] = p->filterA[filter ^ 1] - ((p->filterB[filter] * 31) >> 5); |
||||
p->buf[adaptB] = APESIGN(p->buf[delayB]); |
||||
p->buf[delayB - 1] = p->buf[delayB] - p->buf[delayB - 1]; |
||||
p->buf[adaptB - 1] = APESIGN(p->buf[delayB - 1]); |
||||
p->filterB[filter] = p->filterA[filter ^ 1]; |
||||
|
||||
predictionB = p->buf[delayB ] * p->coeffsB[filter][0] + |
||||
p->buf[delayB - 1] * p->coeffsB[filter][1] + |
||||
p->buf[delayB - 2] * p->coeffsB[filter][2] + |
||||
p->buf[delayB - 3] * p->coeffsB[filter][3] + |
||||
p->buf[delayB - 4] * p->coeffsB[filter][4]; |
||||
|
||||
p->lastA[filter] = decoded + ((predictionA + (predictionB >> 1)) >> 10); |
||||
p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5); |
||||
|
||||
if (!decoded) // no need updating filter coefficients
|
||||
return p->filterA[filter]; |
||||
|
||||
if (decoded > 0) { |
||||
p->coeffsA[filter][0] -= p->buf[adaptA ]; |
||||
p->coeffsA[filter][1] -= p->buf[adaptA - 1]; |
||||
p->coeffsA[filter][2] -= p->buf[adaptA - 2]; |
||||
p->coeffsA[filter][3] -= p->buf[adaptA - 3]; |
||||
|
||||
p->coeffsB[filter][0] -= p->buf[adaptB ]; |
||||
p->coeffsB[filter][1] -= p->buf[adaptB - 1]; |
||||
p->coeffsB[filter][2] -= p->buf[adaptB - 2]; |
||||
p->coeffsB[filter][3] -= p->buf[adaptB - 3]; |
||||
p->coeffsB[filter][4] -= p->buf[adaptB - 4]; |
||||
} else { |
||||
p->coeffsA[filter][0] += p->buf[adaptA ]; |
||||
p->coeffsA[filter][1] += p->buf[adaptA - 1]; |
||||
p->coeffsA[filter][2] += p->buf[adaptA - 2]; |
||||
p->coeffsA[filter][3] += p->buf[adaptA - 3]; |
||||
|
||||
p->coeffsB[filter][0] += p->buf[adaptB ]; |
||||
p->coeffsB[filter][1] += p->buf[adaptB - 1]; |
||||
p->coeffsB[filter][2] += p->buf[adaptB - 2]; |
||||
p->coeffsB[filter][3] += p->buf[adaptB - 3]; |
||||
p->coeffsB[filter][4] += p->buf[adaptB - 4]; |
||||
} |
||||
return p->filterA[filter]; |
||||
} |
||||
|
||||
static void predictor_decode_stereo(APEContext * ctx, int count) |
||||
{ |
||||
int32_t predictionA, predictionB; |
||||
APEPredictor *p = &ctx->predictor; |
||||
int32_t *decoded0 = ctx->decoded0; |
||||
int32_t *decoded1 = ctx->decoded1; |
||||
|
||||
while (count--) { |
||||
/* Predictor Y */ |
||||
predictionA = predictor_update_filter(p, *decoded0, 0, YDELAYA, YDELAYB, YADAPTCOEFFSA, YADAPTCOEFFSB); |
||||
predictionB = predictor_update_filter(p, *decoded1, 1, XDELAYA, XDELAYB, XADAPTCOEFFSA, XADAPTCOEFFSB); |
||||
*(decoded0++) = predictionA; |
||||
*(decoded1++) = predictionB; |
||||
|
||||
/* Combined */ |
||||
p->buf++; |
||||
|
||||
/* Have we filled the history buffer? */ |
||||
if (p->buf == p->historybuffer + HISTORY_SIZE) { |
||||
memmove(p->historybuffer, p->buf, PREDICTOR_SIZE * sizeof(int32_t)); |
||||
p->buf = p->historybuffer; |
||||
} |
||||
} |
||||
} |
||||
|
||||
static void predictor_decode_mono(APEContext * ctx, int count) |
||||
{ |
||||
APEPredictor *p = &ctx->predictor; |
||||
int32_t *decoded0 = ctx->decoded0; |
||||
int32_t predictionA, currentA, A; |
||||
|
||||
currentA = p->lastA[0]; |
||||
|
||||
while (count--) { |
||||
A = *decoded0; |
||||
|
||||
p->buf[YDELAYA] = currentA; |
||||
p->buf[YDELAYA - 1] = p->buf[YDELAYA] - p->buf[YDELAYA - 1]; |
||||
|
||||
predictionA = p->buf[YDELAYA ] * p->coeffsA[0][0] + |
||||
p->buf[YDELAYA - 1] * p->coeffsA[0][1] + |
||||
p->buf[YDELAYA - 2] * p->coeffsA[0][2] + |
||||
p->buf[YDELAYA - 3] * p->coeffsA[0][3]; |
||||
|
||||
currentA = A + (predictionA >> 10); |
||||
|
||||
p->buf[YADAPTCOEFFSA] = APESIGN(p->buf[YDELAYA ]); |
||||
p->buf[YADAPTCOEFFSA - 1] = APESIGN(p->buf[YDELAYA - 1]); |
||||
|
||||
if (A > 0) { |
||||
p->coeffsA[0][0] -= p->buf[YADAPTCOEFFSA ]; |
||||
p->coeffsA[0][1] -= p->buf[YADAPTCOEFFSA - 1]; |
||||
p->coeffsA[0][2] -= p->buf[YADAPTCOEFFSA - 2]; |
||||
p->coeffsA[0][3] -= p->buf[YADAPTCOEFFSA - 3]; |
||||
} else if (A < 0) { |
||||
p->coeffsA[0][0] += p->buf[YADAPTCOEFFSA ]; |
||||
p->coeffsA[0][1] += p->buf[YADAPTCOEFFSA - 1]; |
||||
p->coeffsA[0][2] += p->buf[YADAPTCOEFFSA - 2]; |
||||
p->coeffsA[0][3] += p->buf[YADAPTCOEFFSA - 3]; |
||||
} |
||||
|
||||
p->buf++; |
||||
|
||||
/* Have we filled the history buffer? */ |
||||
if (p->buf == p->historybuffer + HISTORY_SIZE) { |
||||
memmove(p->historybuffer, p->buf, PREDICTOR_SIZE * sizeof(int32_t)); |
||||
p->buf = p->historybuffer; |
||||
} |
||||
|
||||
p->filterA[0] = currentA + ((p->filterA[0] * 31) >> 5); |
||||
*(decoded0++) = p->filterA[0]; |
||||
} |
||||
|
||||
p->lastA[0] = currentA; |
||||
} |
||||
|
||||
static void do_init_filter(APEFilter *f, int16_t * buf, int order) |
||||
{ |
||||
f->coeffs = buf; |
||||
f->historybuffer = buf + order; |
||||
f->delay = f->historybuffer + order * 2; |
||||
f->adaptcoeffs = f->historybuffer + order; |
||||
|
||||
memset(f->historybuffer, 0, (order * 2) * sizeof(int16_t)); |
||||
memset(f->coeffs, 0, order * sizeof(int16_t)); |
||||
f->avg = 0; |
||||
} |
||||
|
||||
static void init_filter(APEContext * ctx, APEFilter *f, int16_t * buf, int order) |
||||
{ |
||||
do_init_filter(&f[0], buf, order); |
||||
do_init_filter(&f[1], buf + order * 3 + HISTORY_SIZE, order); |
||||
} |
||||
|
||||
static inline void do_apply_filter(int version, APEFilter *f, int32_t *data, int count, int order, int fracbits) |
||||
{ |
||||
int res; |
||||
int absres; |
||||
|
||||
while (count--) { |
||||
/* round fixedpoint scalar product */ |
||||
res = (scalarproduct(f->delay - order, f->coeffs, order) + (1 << (fracbits - 1))) >> fracbits; |
||||
|
||||
if (*data < 0) |
||||
vector_add(f->coeffs, f->adaptcoeffs - order, order); |
||||
else if (*data > 0) |
||||
vector_sub(f->coeffs, f->adaptcoeffs - order, order); |
||||
|
||||
res += *data; |
||||
|
||||
*data++ = res; |
||||
|
||||
/* Update the output history */ |
||||
*f->delay++ = av_clip_int16(res); |
||||
|
||||
if (version < 3980) { |
||||
/* Version ??? to < 3.98 files (untested) */ |
||||
f->adaptcoeffs[0] = (res == 0) ? 0 : ((res >> 28) & 8) - 4; |
||||
f->adaptcoeffs[-4] >>= 1; |
||||
f->adaptcoeffs[-8] >>= 1; |
||||
} else { |
||||
/* Version 3.98 and later files */ |
||||
|
||||
/* Update the adaption coefficients */ |
||||
absres = (res < 0 ? -res : res); |
||||
|
||||
if (absres > (f->avg * 3)) |
||||
*f->adaptcoeffs = ((res >> 25) & 64) - 32; |
||||
else if (absres > (f->avg * 4) / 3) |
||||
*f->adaptcoeffs = ((res >> 26) & 32) - 16; |
||||
else if (absres > 0) |
||||
*f->adaptcoeffs = ((res >> 27) & 16) - 8; |
||||
else |
||||
*f->adaptcoeffs = 0; |
||||
|
||||
f->avg += (absres - f->avg) / 16; |
||||
|
||||
f->adaptcoeffs[-1] >>= 1; |
||||
f->adaptcoeffs[-2] >>= 1; |
||||
f->adaptcoeffs[-8] >>= 1; |
||||
} |
||||
|
||||
f->adaptcoeffs++; |
||||
|
||||
/* Have we filled the history buffer? */ |
||||
if (f->delay == f->historybuffer + HISTORY_SIZE + (order * 2)) { |
||||
memmove(f->historybuffer, f->delay - (order * 2), |
||||
(order * 2) * sizeof(int16_t)); |
||||
f->delay = f->historybuffer + order * 2; |
||||
f->adaptcoeffs = f->historybuffer + order; |
||||
} |
||||
} |
||||
} |
||||
|
||||
static void apply_filter(APEContext * ctx, APEFilter *f, |
||||
int32_t * data0, int32_t * data1, |
||||
int count, int order, int fracbits) |
||||
{ |
||||
do_apply_filter(ctx->fileversion, &f[0], data0, count, order, fracbits); |
||||
if (data1) |
||||
do_apply_filter(ctx->fileversion, &f[1], data1, count, order, fracbits); |
||||
} |
||||
|
||||
static void ape_apply_filters(APEContext * ctx, int32_t * decoded0, |
||||
int32_t * decoded1, int count) |
||||
{ |
||||
int i; |
||||
|
||||
for (i = 0; i < APE_FILTER_LEVELS; i++) { |
||||
if (!ape_filter_orders[ctx->fset][i]) |
||||
break; |
||||
apply_filter(ctx, ctx->filters[i], decoded0, decoded1, count, ape_filter_orders[ctx->fset][i], ape_filter_fracbits[ctx->fset][i]); |
||||
} |
||||
} |
||||
|
||||
static void init_frame_decoder(APEContext * ctx) |
||||
{ |
||||
int i; |
||||
init_entropy_decoder(ctx); |
||||
init_predictor_decoder(ctx); |
||||
|
||||
for (i = 0; i < APE_FILTER_LEVELS; i++) { |
||||
if (!ape_filter_orders[ctx->fset][i]) |
||||
break; |
||||
init_filter(ctx, ctx->filters[i], ctx->filterbuf[i], ape_filter_orders[ctx->fset][i]); |
||||
} |
||||
} |
||||
|
||||
static void ape_unpack_mono(APEContext * ctx, int count) |
||||
{ |
||||
int32_t left; |
||||
int32_t *decoded0 = ctx->decoded0; |
||||
int32_t *decoded1 = ctx->decoded1; |
||||
|
||||
if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) { |
||||
entropy_decode(ctx, count, 0); |
||||
/* We are pure silence, so we're done. */ |
||||
av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence mono\n"); |
||||
return; |
||||
} |
||||
|
||||
entropy_decode(ctx, count, 0); |
||||
ape_apply_filters(ctx, decoded0, NULL, count); |
||||
|
||||
/* Now apply the predictor decoding */ |
||||
predictor_decode_mono(ctx, count); |
||||
|
||||
/* Pseudo-stereo - just copy left channel to right channel */ |
||||
if (ctx->channels == 2) { |
||||
while (count--) { |
||||
left = *decoded0; |
||||
*(decoded1++) = *(decoded0++) = left; |
||||
} |
||||
} |
||||
} |
||||
|
||||
static void ape_unpack_stereo(APEContext * ctx, int count) |
||||
{ |
||||
int32_t left, right; |
||||
int32_t *decoded0 = ctx->decoded0; |
||||
int32_t *decoded1 = ctx->decoded1; |
||||
|
||||
if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) { |
||||
/* We are pure silence, so we're done. */ |
||||
av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence stereo\n"); |
||||
return; |
||||
} |
||||
|
||||
entropy_decode(ctx, count, 1); |
||||
ape_apply_filters(ctx, decoded0, decoded1, count); |
||||
|
||||
/* Now apply the predictor decoding */ |
||||
predictor_decode_stereo(ctx, count); |
||||
|
||||
/* Decorrelate and scale to output depth */ |
||||
while (count--) { |
||||
left = *decoded1 - (*decoded0 / 2); |
||||
right = left + *decoded0; |
||||
|
||||
*(decoded0++) = left; |
||||
*(decoded1++) = right; |
||||
} |
||||
} |
||||
|
||||
static int ape_decode_frame(AVCodecContext * avctx, |
||||
void *data, int *data_size, |
||||
uint8_t * buf, int buf_size) |
||||
{ |
||||
APEContext *s = avctx->priv_data; |
||||
int16_t *samples = data; |
||||
int nblocks; |
||||
int i, n; |
||||
int blockstodecode; |
||||
int bytes_used; |
||||
|
||||
if (buf_size == 0 && !s->samples) { |
||||
*data_size = 0; |
||||
return 0; |
||||
} |
||||
|
||||
/* should not happen but who knows */ |
||||
if (BLOCKS_PER_LOOP * 2 * avctx->channels > *data_size) { |
||||
av_log (avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc! (max is %d where you have %d)\n", *data_size, s->samples * 2 * avctx->channels); |
||||
return -1; |
||||
} |
||||
|
||||
if(!s->samples){ |
||||
s->data = av_realloc(s->data, (buf_size + 3) & ~3); |
||||
s->dsp.bswap_buf(s->data, buf, buf_size >> 2); |
||||
s->ptr = s->last_ptr = s->data; |
||||
s->data_end = s->data + buf_size; |
||||
|
||||
nblocks = s->samples = bytestream_get_be32(&s->ptr); |
||||
n = bytestream_get_be32(&s->ptr); |
||||
if(n < 0 || n > 3){ |
||||
av_log(avctx, AV_LOG_ERROR, "Incorrect offset passed\n"); |
||||
s->data = NULL; |
||||
return -1; |
||||
} |
||||
s->ptr += n; |
||||
|
||||
s->currentframeblocks = nblocks; |
||||
buf += 4; |
||||
if (s->samples <= 0) { |
||||
*data_size = 0; |
||||
return buf_size; |
||||
} |
||||
|
||||
memset(s->decoded0, 0, sizeof(s->decoded0)); |
||||
memset(s->decoded1, 0, sizeof(s->decoded1)); |
||||
|
||||
/* Initialize the frame decoder */ |
||||
init_frame_decoder(s); |
||||
} |
||||
|
||||
if (!s->data) { |
||||
*data_size = 0; |
||||
return buf_size; |
||||
} |
||||
|
||||
nblocks = s->samples; |
||||
blockstodecode = FFMIN(BLOCKS_PER_LOOP, nblocks); |
||||
|
||||
if ((s->channels == 1) || (s->frameflags & APE_FRAMECODE_PSEUDO_STEREO)) |
||||
ape_unpack_mono(s, blockstodecode); |
||||
else |
||||
ape_unpack_stereo(s, blockstodecode); |
||||
|
||||
for (i = 0; i < blockstodecode; i++) { |
||||
*samples++ = s->decoded0[i]; |
||||
if(s->channels == 2) |
||||
*samples++ = s->decoded1[i]; |
||||
} |
||||
|
||||
s->samples -= blockstodecode; |
||||
|
||||
*data_size = blockstodecode * 2 * s->channels; |
||||
bytes_used = s->samples ? s->ptr - s->last_ptr : buf_size; |
||||
s->last_ptr = s->ptr; |
||||
return bytes_used; |
||||
} |
||||
|
||||
AVCodec ape_decoder = { |
||||
"ape", |
||||
CODEC_TYPE_AUDIO, |
||||
CODEC_ID_APE, |
||||
sizeof(APEContext), |
||||
ape_decode_init, |
||||
NULL, |
||||
ape_decode_close, |
||||
ape_decode_frame, |
||||
}; |
@ -0,0 +1,392 @@ |
||||
/*
|
||||
* Monkey's Audio APE demuxer |
||||
* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org> |
||||
* based upon libdemac from Dave Chapman. |
||||
* |
||||
* This file is part of FFmpeg. |
||||
* |
||||
* FFmpeg 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, |
||||
* 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 |
||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||||
*/ |
||||
|
||||
#include <stdio.h> |
||||
|
||||
#include "avformat.h" |
||||
|
||||
/* The earliest and latest file formats supported by this library */ |
||||
#define APE_MIN_VERSION 3970 |
||||
#define APE_MAX_VERSION 3990 |
||||
|
||||
#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
|
||||
#define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
|
||||
#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
|
||||
#define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
|
||||
#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
|
||||
#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
|
||||
|
||||
#define MAC_SUBFRAME_SIZE 4608 |
||||
|
||||
#define APE_EXTRADATA_SIZE 6 |
||||
|
||||
typedef struct { |
||||
int64_t pos; |
||||
int nblocks; |
||||
int size; |
||||
int skip; |
||||
int64_t pts; |
||||
} APEFrame; |
||||
|
||||
typedef struct { |
||||
/* Derived fields */ |
||||
uint32_t junklength; |
||||
uint32_t firstframe; |
||||
uint32_t totalsamples; |
||||
int currentframe; |
||||
APEFrame *frames; |
||||
|
||||
/* Info from Descriptor Block */ |
||||
char magic[4]; |
||||
int16_t fileversion; |
||||
int16_t padding1; |
||||
uint32_t descriptorlength; |
||||
uint32_t headerlength; |
||||
uint32_t seektablelength; |
||||
uint32_t wavheaderlength; |
||||
uint32_t audiodatalength; |
||||
uint32_t audiodatalength_high; |
||||
uint32_t wavtaillength; |
||||
uint8_t md5[16]; |
||||
|
||||
/* Info from Header Block */ |
||||
uint16_t compressiontype; |
||||
uint16_t formatflags; |
||||
uint32_t blocksperframe; |
||||
uint32_t finalframeblocks; |
||||
uint32_t totalframes; |
||||
uint16_t bps; |
||||
uint16_t channels; |
||||
uint32_t samplerate; |
||||
|
||||
/* Seektable */ |
||||
uint32_t *seektable; |
||||
} APEContext; |
||||
|
||||
static int ape_probe(AVProbeData * p) |
||||
{ |
||||
if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ') |
||||
return AVPROBE_SCORE_MAX; |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static void ape_dumpinfo(APEContext * ape_ctx) |
||||
{ |
||||
int i; |
||||
|
||||
av_log(NULL, AV_LOG_DEBUG, "Descriptor Block:\n\n"); |
||||
av_log(NULL, AV_LOG_DEBUG, "magic = \"%c%c%c%c\"\n", ape_ctx->magic[0], ape_ctx->magic[1], ape_ctx->magic[2], ape_ctx->magic[3]); |
||||
av_log(NULL, AV_LOG_DEBUG, "fileversion = %d\n", ape_ctx->fileversion); |
||||
av_log(NULL, AV_LOG_DEBUG, "descriptorlength = %d\n", ape_ctx->descriptorlength); |
||||
av_log(NULL, AV_LOG_DEBUG, "headerlength = %d\n", ape_ctx->headerlength); |
||||
av_log(NULL, AV_LOG_DEBUG, "seektablelength = %d\n", ape_ctx->seektablelength); |
||||
av_log(NULL, AV_LOG_DEBUG, "wavheaderlength = %d\n", ape_ctx->wavheaderlength); |
||||
av_log(NULL, AV_LOG_DEBUG, "audiodatalength = %d\n", ape_ctx->audiodatalength); |
||||
av_log(NULL, AV_LOG_DEBUG, "audiodatalength_high = %d\n", ape_ctx->audiodatalength_high); |
||||
av_log(NULL, AV_LOG_DEBUG, "wavtaillength = %d\n", ape_ctx->wavtaillength); |
||||
av_log(NULL, AV_LOG_DEBUG, "md5 = "); |
||||
for (i = 0; i < 16; i++) |
||||
av_log(NULL, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]); |
||||
av_log(NULL, AV_LOG_DEBUG, "\n"); |
||||
|
||||
av_log(NULL, AV_LOG_DEBUG, "\nHeader Block:\n\n"); |
||||
|
||||
av_log(NULL, AV_LOG_DEBUG, "compressiontype = %d\n", ape_ctx->compressiontype); |
||||
av_log(NULL, AV_LOG_DEBUG, "formatflags = %d\n", ape_ctx->formatflags); |
||||
av_log(NULL, AV_LOG_DEBUG, "blocksperframe = %d\n", ape_ctx->blocksperframe); |
||||
av_log(NULL, AV_LOG_DEBUG, "finalframeblocks = %d\n", ape_ctx->finalframeblocks); |
||||
av_log(NULL, AV_LOG_DEBUG, "totalframes = %d\n", ape_ctx->totalframes); |
||||
av_log(NULL, AV_LOG_DEBUG, "bps = %d\n", ape_ctx->bps); |
||||
av_log(NULL, AV_LOG_DEBUG, "channels = %d\n", ape_ctx->channels); |
||||
av_log(NULL, AV_LOG_DEBUG, "samplerate = %d\n", ape_ctx->samplerate); |
||||
|
||||
av_log(NULL, AV_LOG_DEBUG, "\nSeektable\n\n"); |
||||
if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) { |
||||
av_log(NULL, AV_LOG_DEBUG, "No seektable\n"); |
||||
} else { |
||||
for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) { |
||||
if (i < ape_ctx->totalframes - 1) { |
||||
av_log(NULL, AV_LOG_DEBUG, "%8d %d (%d bytes)\n", i, ape_ctx->seektable[i], ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]); |
||||
} else { |
||||
av_log(NULL, AV_LOG_DEBUG, "%8d %d\n", i, ape_ctx->seektable[i]); |
||||
} |
||||
} |
||||
} |
||||
|
||||
av_log(NULL, AV_LOG_DEBUG, "\nFrames\n\n"); |
||||
for (i = 0; i < ape_ctx->totalframes; i++) |
||||
av_log(NULL, AV_LOG_DEBUG, "%8d %8lld %8d (%d samples)\n", i, ape_ctx->frames[i].pos, ape_ctx->frames[i].size, ape_ctx->frames[i].nblocks); |
||||
|
||||
av_log(NULL, AV_LOG_DEBUG, "\nCalculated information:\n\n"); |
||||
av_log(NULL, AV_LOG_DEBUG, "junklength = %d\n", ape_ctx->junklength); |
||||
av_log(NULL, AV_LOG_DEBUG, "firstframe = %d\n", ape_ctx->firstframe); |
||||
av_log(NULL, AV_LOG_DEBUG, "totalsamples = %d\n", ape_ctx->totalsamples); |
||||
} |
||||
|
||||
static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap) |
||||
{ |
||||
ByteIOContext *pb = &s->pb; |
||||
APEContext *ape = s->priv_data; |
||||
AVStream *st; |
||||
uint32_t tag; |
||||
int i; |
||||
int total_blocks; |
||||
int64_t pts; |
||||
|
||||
/* TODO: Skip any leading junk such as id3v2 tags */ |
||||
ape->junklength = 0; |
||||
|
||||
tag = get_le32(pb); |
||||
if (tag != MKTAG('M', 'A', 'C', ' ')) |
||||
return -1; |
||||
|
||||
ape->fileversion = get_le16(pb); |
||||
|
||||
if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) { |
||||
av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10); |
||||
return -1; |
||||
} |
||||
|
||||
if (ape->fileversion >= 3980) { |
||||
ape->padding1 = get_le16(pb); |
||||
ape->descriptorlength = get_le32(pb); |
||||
ape->headerlength = get_le32(pb); |
||||
ape->seektablelength = get_le32(pb); |
||||
ape->wavheaderlength = get_le32(pb); |
||||
ape->audiodatalength = get_le32(pb); |
||||
ape->audiodatalength_high = get_le32(pb); |
||||
ape->wavtaillength = get_le32(pb); |
||||
get_buffer(pb, ape->md5, 16); |
||||
|
||||
/* Skip any unknown bytes at the end of the descriptor.
|
||||
This is for future compatibility */ |
||||
if (ape->descriptorlength > 52) |
||||
url_fseek(pb, ape->descriptorlength - 52, SEEK_CUR); |
||||
|
||||
/* Read header data */ |
||||
ape->compressiontype = get_le16(pb); |
||||
ape->formatflags = get_le16(pb); |
||||
ape->blocksperframe = get_le32(pb); |
||||
ape->finalframeblocks = get_le32(pb); |
||||
ape->totalframes = get_le32(pb); |
||||
ape->bps = get_le16(pb); |
||||
ape->channels = get_le16(pb); |
||||
ape->samplerate = get_le32(pb); |
||||
} else { |
||||
ape->descriptorlength = 0; |
||||
ape->headerlength = 32; |
||||
|
||||
ape->compressiontype = get_le16(pb); |
||||
ape->formatflags = get_le16(pb); |
||||
ape->channels = get_le16(pb); |
||||
ape->samplerate = get_le32(pb); |
||||
ape->wavheaderlength = get_le32(pb); |
||||
ape->wavtaillength = get_le32(pb); |
||||
ape->totalframes = get_le32(pb); |
||||
ape->finalframeblocks = get_le32(pb); |
||||
|
||||
if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) { |
||||
url_fseek(pb, 4, SEEK_CUR); /* Skip the peak level */ |
||||
ape->headerlength += 4; |
||||
} |
||||
|
||||
if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) { |
||||
ape->seektablelength = get_le32(pb); |
||||
ape->headerlength += 4; |
||||
ape->seektablelength *= sizeof(int32_t); |
||||
} else |
||||
ape->seektablelength = ape->totalframes * sizeof(int32_t); |
||||
|
||||
if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT) |
||||
ape->bps = 8; |
||||
else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT) |
||||
ape->bps = 24; |
||||
else |
||||
ape->bps = 16; |
||||
|
||||
if (ape->fileversion >= 3950) |
||||
ape->blocksperframe = 73728 * 4; |
||||
else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000)) |
||||
ape->blocksperframe = 73728; |
||||
else |
||||
ape->blocksperframe = 9216; |
||||
|
||||
/* Skip any stored wav header */ |
||||
if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER)) |
||||
url_fskip(pb, ape->wavheaderlength); |
||||
} |
||||
|
||||
if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){ |
||||
av_log(s, AV_LOG_ERROR, "Too many frames: %d\n", ape->totalframes); |
||||
return -1; |
||||
} |
||||
ape->frames = av_malloc(ape->totalframes * sizeof(APEFrame)); |
||||
if(!ape->frames) |
||||
return AVERROR_NOMEM; |
||||
ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength; |
||||
ape->currentframe = 0; |
||||
|
||||
|
||||
ape->totalsamples = ape->finalframeblocks; |
||||
if (ape->totalframes > 1) |
||||
ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1); |
||||
|
||||
if (ape->seektablelength > 0) { |
||||
ape->seektable = av_malloc(ape->seektablelength); |
||||
for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++) |
||||
ape->seektable[i] = get_le32(pb); |
||||
} |
||||
|
||||
ape->frames[0].pos = ape->firstframe; |
||||
ape->frames[0].nblocks = ape->blocksperframe; |
||||
ape->frames[0].skip = 0; |
||||
for (i = 1; i < ape->totalframes; i++) { |
||||
ape->frames[i].pos = ape->seektable[i]; //ape->frames[i-1].pos + ape->blocksperframe;
|
||||
ape->frames[i].nblocks = ape->blocksperframe; |
||||
ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos; |
||||
ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3; |
||||
} |
||||
ape->frames[ape->totalframes - 1].size = ape->finalframeblocks * 4; |
||||
ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks; |
||||
|
||||
for (i = 0; i < ape->totalframes; i++) { |
||||
if(ape->frames[i].skip){ |
||||
ape->frames[i].pos -= ape->frames[i].skip; |
||||
ape->frames[i].size += ape->frames[i].skip; |
||||
} |
||||
ape->frames[i].size = (ape->frames[i].size + 3) & ~3; |
||||
} |
||||
|
||||
|
||||
ape_dumpinfo(ape); |
||||
|
||||
av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10, ape->compressiontype); |
||||
|
||||
/* now we are ready: build format streams */ |
||||
st = av_new_stream(s, 0); |
||||
if (!st) |
||||
return -1; |
||||
|
||||
total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks; |
||||
|
||||
st->codec->codec_type = CODEC_TYPE_AUDIO; |
||||
st->codec->codec_id = CODEC_ID_APE; |
||||
st->codec->codec_tag = MKTAG('A', 'P', 'E', ' '); |
||||
st->codec->channels = ape->channels; |
||||
st->codec->sample_rate = ape->samplerate; |
||||
st->codec->bits_per_sample = ape->bps; |
||||
st->codec->frame_size = MAC_SUBFRAME_SIZE; |
||||
|
||||
st->nb_frames = ape->totalframes; |
||||
s->start_time = 0; |
||||
s->duration = (int64_t) total_blocks * AV_TIME_BASE / ape->samplerate; |
||||
av_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate); |
||||
|
||||
st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE); |
||||
st->codec->extradata_size = APE_EXTRADATA_SIZE; |
||||
AV_WL16(st->codec->extradata + 0, ape->fileversion); |
||||
AV_WL16(st->codec->extradata + 2, ape->compressiontype); |
||||
AV_WL16(st->codec->extradata + 4, ape->formatflags); |
||||
|
||||
pts = 0; |
||||
for (i = 0; i < ape->totalframes; i++) { |
||||
ape->frames[i].pts = pts; |
||||
av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME); |
||||
pts += ape->blocksperframe / MAC_SUBFRAME_SIZE; |
||||
} |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int ape_read_packet(AVFormatContext * s, AVPacket * pkt) |
||||
{ |
||||
int ret; |
||||
int nblocks; |
||||
APEContext *ape = s->priv_data; |
||||
uint32_t extra_size = 8; |
||||
|
||||
if (url_feof(&s->pb)) |
||||
return AVERROR_IO; |
||||
if (ape->currentframe > ape->totalframes) |
||||
return AVERROR_IO; |
||||
|
||||
url_fseek (&s->pb, ape->frames[ape->currentframe].pos, SEEK_SET); |
||||
|
||||
/* Calculate how many blocks there are in this frame */ |
||||
if (ape->currentframe == (ape->totalframes - 1)) |
||||
nblocks = ape->finalframeblocks; |
||||
else |
||||
nblocks = ape->blocksperframe; |
||||
|
||||
if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0) |
||||
return AVERROR_NOMEM; |
||||
|
||||
AV_WL32(pkt->data , nblocks); |
||||
AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip); |
||||
ret = get_buffer(&s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size); |
||||
|
||||
pkt->pts = ape->frames[ape->currentframe].pts; |
||||
pkt->stream_index = 0; |
||||
|
||||
/* note: we need to modify the packet size here to handle the last
|
||||
packet */ |
||||
pkt->size = ret + extra_size; |
||||
|
||||
ape->currentframe++; |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int ape_read_close(AVFormatContext * s) |
||||
{ |
||||
APEContext *ape = s->priv_data; |
||||
|
||||
av_freep(&ape->frames); |
||||
av_freep(&ape->seektable); |
||||
return 0; |
||||
} |
||||
|
||||
static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
||||
{ |
||||
AVStream *st = s->streams[stream_index]; |
||||
APEContext *ape = s->priv_data; |
||||
int index = av_index_search_timestamp(st, timestamp, flags); |
||||
|
||||
if (index < 0) |
||||
return -1; |
||||
|
||||
ape->currentframe = index; |
||||
return 0; |
||||
} |
||||
|
||||
AVInputFormat ape_demuxer = { |
||||
"ape", |
||||
"Monkey's Audio", |
||||
sizeof(APEContext), |
||||
ape_probe, |
||||
ape_read_header, |
||||
ape_read_packet, |
||||
ape_read_close, |
||||
ape_read_seek, |
||||
.extensions = "ape,apl,mac" |
||||
}; |
Loading…
Reference in new issue