yading@10: /*
yading@10:  * Monkey's Audio lossless audio decoder
yading@10:  * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
yading@10:  *  based upon libdemac from Dave Chapman.
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "avcodec.h"
yading@10: #include "dsputil.h"
yading@10: #include "bytestream.h"
yading@10: #include "internal.h"
yading@10: #include "get_bits.h"
yading@10: #include "unary.h"
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Monkey's Audio lossless audio decoder
yading@10:  */
yading@10: 
yading@10: #define MAX_CHANNELS        2
yading@10: #define MAX_BYTESPERSAMPLE  3
yading@10: 
yading@10: #define APE_FRAMECODE_MONO_SILENCE    1
yading@10: #define APE_FRAMECODE_STEREO_SILENCE  3
yading@10: #define APE_FRAMECODE_PSEUDO_STEREO   4
yading@10: 
yading@10: #define HISTORY_SIZE 512
yading@10: #define PREDICTOR_ORDER 8
yading@10: /** Total size of all predictor histories */
yading@10: #define PREDICTOR_SIZE 50
yading@10: 
yading@10: #define YDELAYA (18 + PREDICTOR_ORDER*4)
yading@10: #define YDELAYB (18 + PREDICTOR_ORDER*3)
yading@10: #define XDELAYA (18 + PREDICTOR_ORDER*2)
yading@10: #define XDELAYB (18 + PREDICTOR_ORDER)
yading@10: 
yading@10: #define YADAPTCOEFFSA 18
yading@10: #define XADAPTCOEFFSA 14
yading@10: #define YADAPTCOEFFSB 10
yading@10: #define XADAPTCOEFFSB 5
yading@10: 
yading@10: /**
yading@10:  * Possible compression levels
yading@10:  * @{
yading@10:  */
yading@10: enum APECompressionLevel {
yading@10:     COMPRESSION_LEVEL_FAST       = 1000,
yading@10:     COMPRESSION_LEVEL_NORMAL     = 2000,
yading@10:     COMPRESSION_LEVEL_HIGH       = 3000,
yading@10:     COMPRESSION_LEVEL_EXTRA_HIGH = 4000,
yading@10:     COMPRESSION_LEVEL_INSANE     = 5000
yading@10: };
yading@10: /** @} */
yading@10: 
yading@10: #define APE_FILTER_LEVELS 3
yading@10: 
yading@10: /** Filter orders depending on compression level */
yading@10: static const uint16_t ape_filter_orders[5][APE_FILTER_LEVELS] = {
yading@10:     {  0,   0,    0 },
yading@10:     { 16,   0,    0 },
yading@10:     { 64,   0,    0 },
yading@10:     { 32, 256,    0 },
yading@10:     { 16, 256, 1280 }
yading@10: };
yading@10: 
yading@10: /** Filter fraction bits depending on compression level */
yading@10: static const uint8_t ape_filter_fracbits[5][APE_FILTER_LEVELS] = {
yading@10:     {  0,  0,  0 },
yading@10:     { 11,  0,  0 },
yading@10:     { 11,  0,  0 },
yading@10:     { 10, 13,  0 },
yading@10:     { 11, 13, 15 }
yading@10: };
yading@10: 
yading@10: 
yading@10: /** Filters applied to the decoded data */
yading@10: typedef struct APEFilter {
yading@10:     int16_t *coeffs;        ///< actual coefficients used in filtering
yading@10:     int16_t *adaptcoeffs;   ///< adaptive filter coefficients used for correcting of actual filter coefficients
yading@10:     int16_t *historybuffer; ///< filter memory
yading@10:     int16_t *delay;         ///< filtered values
yading@10: 
yading@10:     int avg;
yading@10: } APEFilter;
yading@10: 
yading@10: typedef struct APERice {
yading@10:     uint32_t k;
yading@10:     uint32_t ksum;
yading@10: } APERice;
yading@10: 
yading@10: typedef struct APERangecoder {
yading@10:     uint32_t low;           ///< low end of interval
yading@10:     uint32_t range;         ///< length of interval
yading@10:     uint32_t help;          ///< bytes_to_follow resp. intermediate value
yading@10:     unsigned int buffer;    ///< buffer for input/output
yading@10: } APERangecoder;
yading@10: 
yading@10: /** Filter histories */
yading@10: typedef struct APEPredictor {
yading@10:     int32_t *buf;
yading@10: 
yading@10:     int32_t lastA[2];
yading@10: 
yading@10:     int32_t filterA[2];
yading@10:     int32_t filterB[2];
yading@10: 
yading@10:     int32_t coeffsA[2][4];  ///< adaption coefficients
yading@10:     int32_t coeffsB[2][5];  ///< adaption coefficients
yading@10:     int32_t historybuffer[HISTORY_SIZE + PREDICTOR_SIZE];
yading@10: 
yading@10:     unsigned int sample_pos;
yading@10: } APEPredictor;
yading@10: 
yading@10: /** Decoder context */
yading@10: typedef struct APEContext {
yading@10:     AVClass *class;                          ///< class for AVOptions
yading@10:     AVCodecContext *avctx;
yading@10:     DSPContext dsp;
yading@10:     int channels;
yading@10:     int samples;                             ///< samples left to decode in current frame
yading@10:     int bps;
yading@10: 
yading@10:     int fileversion;                         ///< codec version, very important in decoding process
yading@10:     int compression_level;                   ///< compression levels
yading@10:     int fset;                                ///< which filter set to use (calculated from compression level)
yading@10:     int flags;                               ///< global decoder flags
yading@10: 
yading@10:     uint32_t CRC;                            ///< frame CRC
yading@10:     int frameflags;                          ///< frame flags
yading@10:     APEPredictor predictor;                  ///< predictor used for final reconstruction
yading@10: 
yading@10:     int32_t *decoded_buffer;
yading@10:     int decoded_size;
yading@10:     int32_t *decoded[MAX_CHANNELS];          ///< decoded data for each channel
yading@10:     int blocks_per_loop;                     ///< maximum number of samples to decode for each call
yading@10: 
yading@10:     int16_t* filterbuf[APE_FILTER_LEVELS];   ///< filter memory
yading@10: 
yading@10:     APERangecoder rc;                        ///< rangecoder used to decode actual values
yading@10:     APERice riceX;                           ///< rice code parameters for the second channel
yading@10:     APERice riceY;                           ///< rice code parameters for the first channel
yading@10:     APEFilter filters[APE_FILTER_LEVELS][2]; ///< filters used for reconstruction
yading@10:     GetBitContext gb;
yading@10: 
yading@10:     uint8_t *data;                           ///< current frame data
yading@10:     uint8_t *data_end;                       ///< frame data end
yading@10:     int data_size;                           ///< frame data allocated size
yading@10:     const uint8_t *ptr;                      ///< current position in frame data
yading@10: 
yading@10:     int error;
yading@10: 
yading@10:     void (*entropy_decode_mono)(struct APEContext *ctx, int blockstodecode);
yading@10:     void (*entropy_decode_stereo)(struct APEContext *ctx, int blockstodecode);
yading@10:     void (*predictor_decode_mono)(struct APEContext *ctx, int count);
yading@10:     void (*predictor_decode_stereo)(struct APEContext *ctx, int count);
yading@10: } APEContext;
yading@10: 
yading@10: static void ape_apply_filters(APEContext *ctx, int32_t *decoded0,
yading@10:                               int32_t *decoded1, int count);
yading@10: 
yading@10: static void entropy_decode_mono_0000(APEContext *ctx, int blockstodecode);
yading@10: static void entropy_decode_stereo_0000(APEContext *ctx, int blockstodecode);
yading@10: static void entropy_decode_mono_3860(APEContext *ctx, int blockstodecode);
yading@10: static void entropy_decode_stereo_3860(APEContext *ctx, int blockstodecode);
yading@10: static void entropy_decode_mono_3900(APEContext *ctx, int blockstodecode);
yading@10: static void entropy_decode_stereo_3900(APEContext *ctx, int blockstodecode);
yading@10: static void entropy_decode_stereo_3930(APEContext *ctx, int blockstodecode);
yading@10: static void entropy_decode_mono_3990(APEContext *ctx, int blockstodecode);
yading@10: static void entropy_decode_stereo_3990(APEContext *ctx, int blockstodecode);
yading@10: 
yading@10: static void predictor_decode_mono_3800(APEContext *ctx, int count);
yading@10: static void predictor_decode_stereo_3800(APEContext *ctx, int count);
yading@10: static void predictor_decode_mono_3930(APEContext *ctx, int count);
yading@10: static void predictor_decode_stereo_3930(APEContext *ctx, int count);
yading@10: static void predictor_decode_mono_3950(APEContext *ctx, int count);
yading@10: static void predictor_decode_stereo_3950(APEContext *ctx, int count);
yading@10: 
yading@10: // TODO: dsputilize
yading@10: 
yading@10: static av_cold int ape_decode_close(AVCodecContext *avctx)
yading@10: {
yading@10:     APEContext *s = avctx->priv_data;
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < APE_FILTER_LEVELS; i++)
yading@10:         av_freep(&s->filterbuf[i]);
yading@10: 
yading@10:     av_freep(&s->decoded_buffer);
yading@10:     av_freep(&s->data);
yading@10:     s->decoded_size = s->data_size = 0;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int ape_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     APEContext *s = avctx->priv_data;
yading@10:     int i;
yading@10: 
yading@10:     if (avctx->extradata_size != 6) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Incorrect extradata\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     if (avctx->channels > 2) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Only mono and stereo is supported\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     s->bps = avctx->bits_per_coded_sample;
yading@10:     switch (s->bps) {
yading@10:     case 8:
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
yading@10:         break;
yading@10:     case 16:
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
yading@10:         break;
yading@10:     case 24:
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
yading@10:         break;
yading@10:     default:
yading@10:         avpriv_request_sample(avctx,
yading@10:                               "%d bits per coded sample", s->bps);
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10:     s->avctx             = avctx;
yading@10:     s->channels          = avctx->channels;
yading@10:     s->fileversion       = AV_RL16(avctx->extradata);
yading@10:     s->compression_level = AV_RL16(avctx->extradata + 2);
yading@10:     s->flags             = AV_RL16(avctx->extradata + 4);
yading@10: 
yading@10:     av_log(avctx, AV_LOG_DEBUG, "Compression Level: %d - Flags: %d\n",
yading@10:            s->compression_level, s->flags);
yading@10:     if (s->compression_level % 1000 || s->compression_level > COMPRESSION_LEVEL_INSANE ||
yading@10:         !s->compression_level ||
yading@10:         (s->fileversion < 3930 && s->compression_level == COMPRESSION_LEVEL_INSANE)) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Incorrect compression level %d\n",
yading@10:                s->compression_level);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     s->fset = s->compression_level / 1000 - 1;
yading@10:     for (i = 0; i < APE_FILTER_LEVELS; i++) {
yading@10:         if (!ape_filter_orders[s->fset][i])
yading@10:             break;
yading@10:         FF_ALLOC_OR_GOTO(avctx, s->filterbuf[i],
yading@10:                          (ape_filter_orders[s->fset][i] * 3 + HISTORY_SIZE) * 4,
yading@10:                          filter_alloc_fail);
yading@10:     }
yading@10: 
yading@10:     if (s->fileversion < 3860) {
yading@10:         s->entropy_decode_mono   = entropy_decode_mono_0000;
yading@10:         s->entropy_decode_stereo = entropy_decode_stereo_0000;
yading@10:     } else if (s->fileversion < 3900) {
yading@10:         s->entropy_decode_mono   = entropy_decode_mono_3860;
yading@10:         s->entropy_decode_stereo = entropy_decode_stereo_3860;
yading@10:     } else if (s->fileversion < 3930) {
yading@10:         s->entropy_decode_mono   = entropy_decode_mono_3900;
yading@10:         s->entropy_decode_stereo = entropy_decode_stereo_3900;
yading@10:     } else if (s->fileversion < 3990) {
yading@10:         s->entropy_decode_mono   = entropy_decode_mono_3900;
yading@10:         s->entropy_decode_stereo = entropy_decode_stereo_3930;
yading@10:     } else {
yading@10:         s->entropy_decode_mono   = entropy_decode_mono_3990;
yading@10:         s->entropy_decode_stereo = entropy_decode_stereo_3990;
yading@10:     }
yading@10: 
yading@10:     if (s->fileversion < 3930) {
yading@10:         s->predictor_decode_mono   = predictor_decode_mono_3800;
yading@10:         s->predictor_decode_stereo = predictor_decode_stereo_3800;
yading@10:     } else if (s->fileversion < 3950) {
yading@10:         s->predictor_decode_mono   = predictor_decode_mono_3930;
yading@10:         s->predictor_decode_stereo = predictor_decode_stereo_3930;
yading@10:     } else {
yading@10:         s->predictor_decode_mono   = predictor_decode_mono_3950;
yading@10:         s->predictor_decode_stereo = predictor_decode_stereo_3950;
yading@10:     }
yading@10: 
yading@10:     ff_dsputil_init(&s->dsp, avctx);
yading@10:     avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
yading@10: 
yading@10:     return 0;
yading@10: filter_alloc_fail:
yading@10:     ape_decode_close(avctx);
yading@10:     return AVERROR(ENOMEM);
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * @name APE range decoding functions
yading@10:  * @{
yading@10:  */
yading@10: 
yading@10: #define CODE_BITS    32
yading@10: #define TOP_VALUE    ((unsigned int)1 << (CODE_BITS-1))
yading@10: #define SHIFT_BITS   (CODE_BITS - 9)
yading@10: #define EXTRA_BITS   ((CODE_BITS-2) % 8 + 1)
yading@10: #define BOTTOM_VALUE (TOP_VALUE >> 8)
yading@10: 
yading@10: /** Start the decoder */
yading@10: static inline void range_start_decoding(APEContext *ctx)
yading@10: {
yading@10:     ctx->rc.buffer = bytestream_get_byte(&ctx->ptr);
yading@10:     ctx->rc.low    = ctx->rc.buffer >> (8 - EXTRA_BITS);
yading@10:     ctx->rc.range  = (uint32_t) 1 << EXTRA_BITS;
yading@10: }
yading@10: 
yading@10: /** Perform normalization */
yading@10: static inline void range_dec_normalize(APEContext *ctx)
yading@10: {
yading@10:     while (ctx->rc.range <= BOTTOM_VALUE) {
yading@10:         ctx->rc.buffer <<= 8;
yading@10:         if(ctx->ptr < ctx->data_end) {
yading@10:             ctx->rc.buffer += *ctx->ptr;
yading@10:             ctx->ptr++;
yading@10:         } else {
yading@10:             ctx->error = 1;
yading@10:         }
yading@10:         ctx->rc.low    = (ctx->rc.low << 8)    | ((ctx->rc.buffer >> 1) & 0xFF);
yading@10:         ctx->rc.range  <<= 8;
yading@10:     }
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Calculate culmulative frequency for next symbol. Does NO update!
yading@10:  * @param ctx decoder context
yading@10:  * @param tot_f is the total frequency or (code_value)1<<shift
yading@10:  * @return the culmulative frequency
yading@10:  */
yading@10: static inline int range_decode_culfreq(APEContext *ctx, int tot_f)
yading@10: {
yading@10:     range_dec_normalize(ctx);
yading@10:     ctx->rc.help = ctx->rc.range / tot_f;
yading@10:     return ctx->rc.low / ctx->rc.help;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Decode value with given size in bits
yading@10:  * @param ctx decoder context
yading@10:  * @param shift number of bits to decode
yading@10:  */
yading@10: static inline int range_decode_culshift(APEContext *ctx, int shift)
yading@10: {
yading@10:     range_dec_normalize(ctx);
yading@10:     ctx->rc.help = ctx->rc.range >> shift;
yading@10:     return ctx->rc.low / ctx->rc.help;
yading@10: }
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * Update decoding state
yading@10:  * @param ctx decoder context
yading@10:  * @param sy_f the interval length (frequency of the symbol)
yading@10:  * @param lt_f the lower end (frequency sum of < symbols)
yading@10:  */
yading@10: static inline void range_decode_update(APEContext *ctx, int sy_f, int lt_f)
yading@10: {
yading@10:     ctx->rc.low  -= ctx->rc.help * lt_f;
yading@10:     ctx->rc.range = ctx->rc.help * sy_f;
yading@10: }
yading@10: 
yading@10: /** Decode n bits (n <= 16) without modelling */
yading@10: static inline int range_decode_bits(APEContext *ctx, int n)
yading@10: {
yading@10:     int sym = range_decode_culshift(ctx, n);
yading@10:     range_decode_update(ctx, 1, sym);
yading@10:     return sym;
yading@10: }
yading@10: 
yading@10: 
yading@10: #define MODEL_ELEMENTS 64
yading@10: 
yading@10: /**
yading@10:  * Fixed probabilities for symbols in Monkey Audio version 3.97
yading@10:  */
yading@10: static const uint16_t counts_3970[22] = {
yading@10:         0, 14824, 28224, 39348, 47855, 53994, 58171, 60926,
yading@10:     62682, 63786, 64463, 64878, 65126, 65276, 65365, 65419,
yading@10:     65450, 65469, 65480, 65487, 65491, 65493,
yading@10: };
yading@10: 
yading@10: /**
yading@10:  * Probability ranges for symbols in Monkey Audio version 3.97
yading@10:  */
yading@10: static const uint16_t counts_diff_3970[21] = {
yading@10:     14824, 13400, 11124, 8507, 6139, 4177, 2755, 1756,
yading@10:     1104, 677, 415, 248, 150, 89, 54, 31,
yading@10:     19, 11, 7, 4, 2,
yading@10: };
yading@10: 
yading@10: /**
yading@10:  * Fixed probabilities for symbols in Monkey Audio version 3.98
yading@10:  */
yading@10: static const uint16_t counts_3980[22] = {
yading@10:         0, 19578, 36160, 48417, 56323, 60899, 63265, 64435,
yading@10:     64971, 65232, 65351, 65416, 65447, 65466, 65476, 65482,
yading@10:     65485, 65488, 65490, 65491, 65492, 65493,
yading@10: };
yading@10: 
yading@10: /**
yading@10:  * Probability ranges for symbols in Monkey Audio version 3.98
yading@10:  */
yading@10: static const uint16_t counts_diff_3980[21] = {
yading@10:     19578, 16582, 12257, 7906, 4576, 2366, 1170, 536,
yading@10:     261, 119, 65, 31, 19, 10, 6, 3,
yading@10:     3, 2, 1, 1, 1,
yading@10: };
yading@10: 
yading@10: /**
yading@10:  * Decode symbol
yading@10:  * @param ctx decoder context
yading@10:  * @param counts probability range start position
yading@10:  * @param counts_diff probability range widths
yading@10:  */
yading@10: static inline int range_get_symbol(APEContext *ctx,
yading@10:                                    const uint16_t counts[],
yading@10:                                    const uint16_t counts_diff[])
yading@10: {
yading@10:     int symbol, cf;
yading@10: 
yading@10:     cf = range_decode_culshift(ctx, 16);
yading@10: 
yading@10:     if(cf > 65492){
yading@10:         symbol= cf - 65535 + 63;
yading@10:         range_decode_update(ctx, 1, cf);
yading@10:         if(cf > 65535)
yading@10:             ctx->error=1;
yading@10:         return symbol;
yading@10:     }
yading@10:     /* figure out the symbol inefficiently; a binary search would be much better */
yading@10:     for (symbol = 0; counts[symbol + 1] <= cf; symbol++);
yading@10: 
yading@10:     range_decode_update(ctx, counts_diff[symbol], counts[symbol]);
yading@10: 
yading@10:     return symbol;
yading@10: }
yading@10: /** @} */ // group rangecoder
yading@10: 
yading@10: static inline void update_rice(APERice *rice, unsigned int x)
yading@10: {
yading@10:     int lim = rice->k ? (1 << (rice->k + 4)) : 0;
yading@10:     rice->ksum += ((x + 1) / 2) - ((rice->ksum + 16) >> 5);
yading@10: 
yading@10:     if (rice->ksum < lim)
yading@10:         rice->k--;
yading@10:     else if (rice->ksum >= (1 << (rice->k + 5)))
yading@10:         rice->k++;
yading@10: }
yading@10: 
yading@10: static inline int get_rice_ook(GetBitContext *gb, int k)
yading@10: {
yading@10:     unsigned int x;
yading@10: 
yading@10:     x = get_unary(gb, 1, get_bits_left(gb));
yading@10: 
yading@10:     if (k)
yading@10:         x = (x << k) | get_bits(gb, k);
yading@10: 
yading@10:     return x;
yading@10: }
yading@10: 
yading@10: static inline int ape_decode_value_3860(APEContext *ctx, GetBitContext *gb,
yading@10:                                         APERice *rice)
yading@10: {
yading@10:     unsigned int x, overflow;
yading@10: 
yading@10:     overflow = get_unary(gb, 1, get_bits_left(gb));
yading@10: 
yading@10:     if (ctx->fileversion > 3880) {
yading@10:         while (overflow >= 16) {
yading@10:             overflow -= 16;
yading@10:             rice->k  += 4;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (!rice->k)
yading@10:         x = overflow;
yading@10:     else
yading@10:         x = (overflow << rice->k) + get_bits(gb, rice->k);
yading@10: 
yading@10:     rice->ksum += x - (rice->ksum + 8 >> 4);
yading@10:     if (rice->ksum < (rice->k ? 1 << (rice->k + 4) : 0))
yading@10:         rice->k--;
yading@10:     else if (rice->ksum >= (1 << (rice->k + 5)) && rice->k < 24)
yading@10:         rice->k++;
yading@10: 
yading@10:     /* Convert to signed */
yading@10:     if (x & 1)
yading@10:         return (x >> 1) + 1;
yading@10:     else
yading@10:         return -(x >> 1);
yading@10: }
yading@10: 
yading@10: static inline int ape_decode_value_3900(APEContext *ctx, APERice *rice)
yading@10: {
yading@10:     unsigned int x, overflow;
yading@10:     int tmpk;
yading@10: 
yading@10:     overflow = range_get_symbol(ctx, counts_3970, counts_diff_3970);
yading@10: 
yading@10:     if (overflow == (MODEL_ELEMENTS - 1)) {
yading@10:         tmpk = range_decode_bits(ctx, 5);
yading@10:         overflow = 0;
yading@10:     } else
yading@10:         tmpk = (rice->k < 1) ? 0 : rice->k - 1;
yading@10: 
yading@10:     if (tmpk <= 16 || ctx->fileversion < 3910)
yading@10:         x = range_decode_bits(ctx, tmpk);
yading@10:     else if (tmpk <= 32) {
yading@10:         x = range_decode_bits(ctx, 16);
yading@10:         x |= (range_decode_bits(ctx, tmpk - 16) << 16);
yading@10:     } else {
yading@10:         av_log(ctx->avctx, AV_LOG_ERROR, "Too many bits: %d\n", tmpk);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     x += overflow << tmpk;
yading@10: 
yading@10:     update_rice(rice, x);
yading@10: 
yading@10:     /* Convert to signed */
yading@10:     if (x & 1)
yading@10:         return (x >> 1) + 1;
yading@10:     else
yading@10:         return -(x >> 1);
yading@10: }
yading@10: 
yading@10: static inline int ape_decode_value_3990(APEContext *ctx, APERice *rice)
yading@10: {
yading@10:     unsigned int x, overflow;
yading@10:     int base, pivot;
yading@10: 
yading@10:     pivot = rice->ksum >> 5;
yading@10:     if (pivot == 0)
yading@10:         pivot = 1;
yading@10: 
yading@10:     overflow = range_get_symbol(ctx, counts_3980, counts_diff_3980);
yading@10: 
yading@10:     if (overflow == (MODEL_ELEMENTS - 1)) {
yading@10:         overflow  = range_decode_bits(ctx, 16) << 16;
yading@10:         overflow |= range_decode_bits(ctx, 16);
yading@10:     }
yading@10: 
yading@10:     if (pivot < 0x10000) {
yading@10:         base = range_decode_culfreq(ctx, pivot);
yading@10:         range_decode_update(ctx, 1, base);
yading@10:     } else {
yading@10:         int base_hi = pivot, base_lo;
yading@10:         int bbits = 0;
yading@10: 
yading@10:         while (base_hi & ~0xFFFF) {
yading@10:             base_hi >>= 1;
yading@10:             bbits++;
yading@10:         }
yading@10:         base_hi = range_decode_culfreq(ctx, base_hi + 1);
yading@10:         range_decode_update(ctx, 1, base_hi);
yading@10:         base_lo = range_decode_culfreq(ctx, 1 << bbits);
yading@10:         range_decode_update(ctx, 1, base_lo);
yading@10: 
yading@10:         base = (base_hi << bbits) + base_lo;
yading@10:     }
yading@10: 
yading@10:     x = base + overflow * pivot;
yading@10: 
yading@10:     update_rice(rice, x);
yading@10: 
yading@10:     /* Convert to signed */
yading@10:     if (x & 1)
yading@10:         return (x >> 1) + 1;
yading@10:     else
yading@10:         return -(x >> 1);
yading@10: }
yading@10: 
yading@10: static void decode_array_0000(APEContext *ctx, GetBitContext *gb,
yading@10:                               int32_t *out, APERice *rice, int blockstodecode)
yading@10: {
yading@10:     int i;
yading@10:     int ksummax, ksummin;
yading@10: 
yading@10:     rice->ksum = 0;
yading@10:     for (i = 0; i < 5; i++) {
yading@10:         out[i] = get_rice_ook(&ctx->gb, 10);
yading@10:         rice->ksum += out[i];
yading@10:     }
yading@10:     rice->k = av_log2(rice->ksum / 10) + 1;
yading@10:     for (; i < 64; i++) {
yading@10:         out[i] = get_rice_ook(&ctx->gb, rice->k);
yading@10:         rice->ksum += out[i];
yading@10:         rice->k = av_log2(rice->ksum / ((i + 1) * 2)) + 1;
yading@10:     }
yading@10:     ksummax = 1 << rice->k + 7;
yading@10:     ksummin = rice->k ? (1 << rice->k + 6) : 0;
yading@10:     for (; i < blockstodecode; i++) {
yading@10:         out[i] = get_rice_ook(&ctx->gb, rice->k);
yading@10:         rice->ksum += out[i] - out[i - 64];
yading@10:         while (rice->ksum < ksummin) {
yading@10:             rice->k--;
yading@10:             ksummin = rice->k ? ksummin >> 1 : 0;
yading@10:             ksummax >>= 1;
yading@10:         }
yading@10:         while (rice->ksum >= ksummax) {
yading@10:             rice->k++;
yading@10:             if (rice->k > 24)
yading@10:                 return;
yading@10:             ksummax <<= 1;
yading@10:             ksummin = ksummin ? ksummin << 1 : 128;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     for (i = 0; i < blockstodecode; i++) {
yading@10:         if (out[i] & 1)
yading@10:             out[i] = (out[i] >> 1) + 1;
yading@10:         else
yading@10:             out[i] = -(out[i] >> 1);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void entropy_decode_mono_0000(APEContext *ctx, int blockstodecode)
yading@10: {
yading@10:     decode_array_0000(ctx, &ctx->gb, ctx->decoded[0], &ctx->riceY,
yading@10:                       blockstodecode);
yading@10: }
yading@10: 
yading@10: static void entropy_decode_stereo_0000(APEContext *ctx, int blockstodecode)
yading@10: {
yading@10:     decode_array_0000(ctx, &ctx->gb, ctx->decoded[0], &ctx->riceY,
yading@10:                       blockstodecode);
yading@10:     decode_array_0000(ctx, &ctx->gb, ctx->decoded[1], &ctx->riceX,
yading@10:                       blockstodecode);
yading@10: }
yading@10: 
yading@10: static void entropy_decode_mono_3860(APEContext *ctx, int blockstodecode)
yading@10: {
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10: 
yading@10:     while (blockstodecode--)
yading@10:         *decoded0++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceY);
yading@10: }
yading@10: 
yading@10: static void entropy_decode_stereo_3860(APEContext *ctx, int blockstodecode)
yading@10: {
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10:     int32_t *decoded1 = ctx->decoded[1];
yading@10:     int blocks = blockstodecode;
yading@10: 
yading@10:     while (blockstodecode--)
yading@10:         *decoded0++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceY);
yading@10:     while (blocks--)
yading@10:         *decoded1++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceX);
yading@10: }
yading@10: 
yading@10: static void entropy_decode_mono_3900(APEContext *ctx, int blockstodecode)
yading@10: {
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10: 
yading@10:     while (blockstodecode--)
yading@10:         *decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
yading@10: }
yading@10: 
yading@10: static void entropy_decode_stereo_3900(APEContext *ctx, int blockstodecode)
yading@10: {
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10:     int32_t *decoded1 = ctx->decoded[1];
yading@10:     int blocks = blockstodecode;
yading@10: 
yading@10:     while (blockstodecode--)
yading@10:         *decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
yading@10:     range_dec_normalize(ctx);
yading@10:     // because of some implementation peculiarities we need to backpedal here
yading@10:     ctx->ptr -= 1;
yading@10:     range_start_decoding(ctx);
yading@10:     while (blocks--)
yading@10:         *decoded1++ = ape_decode_value_3900(ctx, &ctx->riceX);
yading@10: }
yading@10: 
yading@10: static void entropy_decode_stereo_3930(APEContext *ctx, int blockstodecode)
yading@10: {
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10:     int32_t *decoded1 = ctx->decoded[1];
yading@10: 
yading@10:     while (blockstodecode--) {
yading@10:         *decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
yading@10:         *decoded1++ = ape_decode_value_3900(ctx, &ctx->riceX);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void entropy_decode_mono_3990(APEContext *ctx, int blockstodecode)
yading@10: {
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10: 
yading@10:     while (blockstodecode--)
yading@10:         *decoded0++ = ape_decode_value_3990(ctx, &ctx->riceY);
yading@10: }
yading@10: 
yading@10: static void entropy_decode_stereo_3990(APEContext *ctx, int blockstodecode)
yading@10: {
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10:     int32_t *decoded1 = ctx->decoded[1];
yading@10: 
yading@10:     while (blockstodecode--) {
yading@10:         *decoded0++ = ape_decode_value_3990(ctx, &ctx->riceY);
yading@10:         *decoded1++ = ape_decode_value_3990(ctx, &ctx->riceX);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int init_entropy_decoder(APEContext *ctx)
yading@10: {
yading@10:     /* Read the CRC */
yading@10:     if (ctx->fileversion >= 3900) {
yading@10:         if (ctx->data_end - ctx->ptr < 6)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         ctx->CRC = bytestream_get_be32(&ctx->ptr);
yading@10:     } else {
yading@10:         ctx->CRC = get_bits_long(&ctx->gb, 32);
yading@10:     }
yading@10: 
yading@10:     /* Read the frame flags if they exist */
yading@10:     ctx->frameflags = 0;
yading@10:     if ((ctx->fileversion > 3820) && (ctx->CRC & 0x80000000)) {
yading@10:         ctx->CRC &= ~0x80000000;
yading@10: 
yading@10:         if (ctx->data_end - ctx->ptr < 6)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         ctx->frameflags = bytestream_get_be32(&ctx->ptr);
yading@10:     }
yading@10: 
yading@10:     /* Initialize the rice structs */
yading@10:     ctx->riceX.k = 10;
yading@10:     ctx->riceX.ksum = (1 << ctx->riceX.k) * 16;
yading@10:     ctx->riceY.k = 10;
yading@10:     ctx->riceY.ksum = (1 << ctx->riceY.k) * 16;
yading@10: 
yading@10:     if (ctx->fileversion >= 3900) {
yading@10:         /* The first 8 bits of input are ignored. */
yading@10:         ctx->ptr++;
yading@10: 
yading@10:         range_start_decoding(ctx);
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static const int32_t initial_coeffs_fast_3320[1] = {
yading@10:     375,
yading@10: };
yading@10: 
yading@10: static const int32_t initial_coeffs_a_3800[3] = {
yading@10:     64, 115, 64,
yading@10: };
yading@10: 
yading@10: static const int32_t initial_coeffs_b_3800[2] = {
yading@10:     740, 0
yading@10: };
yading@10: 
yading@10: static const int32_t initial_coeffs_3930[4] = {
yading@10:     360, 317, -109, 98
yading@10: };
yading@10: 
yading@10: static void init_predictor_decoder(APEContext *ctx)
yading@10: {
yading@10:     APEPredictor *p = &ctx->predictor;
yading@10: 
yading@10:     /* Zero the history buffers */
yading@10:     memset(p->historybuffer, 0, PREDICTOR_SIZE * sizeof(*p->historybuffer));
yading@10:     p->buf = p->historybuffer;
yading@10: 
yading@10:     /* Initialize and zero the coefficients */
yading@10:     if (ctx->fileversion < 3930) {
yading@10:         if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
yading@10:             memcpy(p->coeffsA[0], initial_coeffs_fast_3320,
yading@10:                    sizeof(initial_coeffs_fast_3320));
yading@10:             memcpy(p->coeffsA[1], initial_coeffs_fast_3320,
yading@10:                    sizeof(initial_coeffs_fast_3320));
yading@10:         } else {
yading@10:             memcpy(p->coeffsA[0], initial_coeffs_a_3800,
yading@10:                    sizeof(initial_coeffs_a_3800));
yading@10:             memcpy(p->coeffsA[1], initial_coeffs_a_3800,
yading@10:                    sizeof(initial_coeffs_a_3800));
yading@10:         }
yading@10:     } else {
yading@10:         memcpy(p->coeffsA[0], initial_coeffs_3930, sizeof(initial_coeffs_3930));
yading@10:         memcpy(p->coeffsA[1], initial_coeffs_3930, sizeof(initial_coeffs_3930));
yading@10:     }
yading@10:     memset(p->coeffsB, 0, sizeof(p->coeffsB));
yading@10:     if (ctx->fileversion < 3930) {
yading@10:         memcpy(p->coeffsB[0], initial_coeffs_b_3800,
yading@10:                sizeof(initial_coeffs_b_3800));
yading@10:         memcpy(p->coeffsB[1], initial_coeffs_b_3800,
yading@10:                sizeof(initial_coeffs_b_3800));
yading@10:     }
yading@10: 
yading@10:     p->filterA[0] = p->filterA[1] = 0;
yading@10:     p->filterB[0] = p->filterB[1] = 0;
yading@10:     p->lastA[0]   = p->lastA[1]   = 0;
yading@10: 
yading@10:     p->sample_pos = 0;
yading@10: }
yading@10: 
yading@10: /** Get inverse sign of integer (-1 for positive, 1 for negative and 0 for zero) */
yading@10: static inline int APESIGN(int32_t x) {
yading@10:     return (x < 0) - (x > 0);
yading@10: }
yading@10: 
yading@10: static av_always_inline int filter_fast_3320(APEPredictor *p,
yading@10:                                              const int decoded, const int filter,
yading@10:                                              const int delayA)
yading@10: {
yading@10:     int32_t predictionA;
yading@10: 
yading@10:     p->buf[delayA] = p->lastA[filter];
yading@10:     if (p->sample_pos < 3) {
yading@10:         p->lastA[filter]   = decoded;
yading@10:         p->filterA[filter] = decoded;
yading@10:         return decoded;
yading@10:     }
yading@10: 
yading@10:     predictionA = p->buf[delayA] * 2 - p->buf[delayA - 1];
yading@10:     p->lastA[filter] = decoded + (predictionA  * p->coeffsA[filter][0] >> 9);
yading@10: 
yading@10:     if ((decoded ^ predictionA) > 0)
yading@10:         p->coeffsA[filter][0]++;
yading@10:     else
yading@10:         p->coeffsA[filter][0]--;
yading@10: 
yading@10:     p->filterA[filter] += p->lastA[filter];
yading@10: 
yading@10:     return p->filterA[filter];
yading@10: }
yading@10: 
yading@10: static av_always_inline int filter_3800(APEPredictor *p,
yading@10:                                         const int decoded, const int filter,
yading@10:                                         const int delayA,  const int delayB,
yading@10:                                         const int start,   const int shift)
yading@10: {
yading@10:     int32_t predictionA, predictionB, sign;
yading@10:     int32_t d0, d1, d2, d3, d4;
yading@10: 
yading@10:     p->buf[delayA] = p->lastA[filter];
yading@10:     p->buf[delayB] = p->filterB[filter];
yading@10:     if (p->sample_pos < start) {
yading@10:         predictionA = decoded + p->filterA[filter];
yading@10:         p->lastA[filter]   = decoded;
yading@10:         p->filterB[filter] = decoded;
yading@10:         p->filterA[filter] = predictionA;
yading@10:         return predictionA;
yading@10:     }
yading@10:     d2 =  p->buf[delayA];
yading@10:     d1 = (p->buf[delayA] - p->buf[delayA - 1]) << 1;
yading@10:     d0 =  p->buf[delayA] + ((p->buf[delayA - 2] - p->buf[delayA - 1]) << 3);
yading@10:     d3 =  p->buf[delayB] * 2 - p->buf[delayB - 1];
yading@10:     d4 =  p->buf[delayB];
yading@10: 
yading@10:     predictionA = d0 * p->coeffsA[filter][0] +
yading@10:                   d1 * p->coeffsA[filter][1] +
yading@10:                   d2 * p->coeffsA[filter][2];
yading@10: 
yading@10:     sign = APESIGN(decoded);
yading@10:     p->coeffsA[filter][0] += (((d0 >> 30) & 2) - 1) * sign;
yading@10:     p->coeffsA[filter][1] += (((d1 >> 28) & 8) - 4) * sign;
yading@10:     p->coeffsA[filter][2] += (((d2 >> 28) & 8) - 4) * sign;
yading@10: 
yading@10:     predictionB = d3 * p->coeffsB[filter][0] -
yading@10:                   d4 * p->coeffsB[filter][1];
yading@10:     p->lastA[filter] = decoded + (predictionA >> 11);
yading@10:     sign = APESIGN(p->lastA[filter]);
yading@10:     p->coeffsB[filter][0] += (((d3 >> 29) & 4) - 2) * sign;
yading@10:     p->coeffsB[filter][1] -= (((d4 >> 30) & 2) - 1) * sign;
yading@10: 
yading@10:     p->filterB[filter] = p->lastA[filter] + (predictionB >> shift);
yading@10:     p->filterA[filter] = p->filterB[filter] + ((p->filterA[filter] * 31) >> 5);
yading@10: 
yading@10:     return p->filterA[filter];
yading@10: }
yading@10: 
yading@10: static void long_filter_high_3800(int32_t *buffer, int order, int shift,
yading@10:                                   int32_t *coeffs, int32_t *delay, int length)
yading@10: {
yading@10:     int i, j;
yading@10:     int32_t dotprod, sign;
yading@10: 
yading@10:     memset(coeffs, 0, order * sizeof(*coeffs));
yading@10:     for (i = 0; i < order; i++)
yading@10:         delay[i] = buffer[i];
yading@10:     for (i = order; i < length; i++) {
yading@10:         dotprod = 0;
yading@10:         sign = APESIGN(buffer[i]);
yading@10:         for (j = 0; j < order; j++) {
yading@10:             dotprod += delay[j] * coeffs[j];
yading@10:             coeffs[j] -= (((delay[j] >> 30) & 2) - 1) * sign;
yading@10:         }
yading@10:         buffer[i] -= dotprod >> shift;
yading@10:         for (j = 0; j < order - 1; j++)
yading@10:             delay[j] = delay[j + 1];
yading@10:         delay[order - 1] = buffer[i];
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void long_filter_ehigh_3830(int32_t *buffer, int length)
yading@10: {
yading@10:     int i, j;
yading@10:     int32_t dotprod, sign;
yading@10:     int32_t coeffs[8], delay[8];
yading@10: 
yading@10:     memset(coeffs, 0, sizeof(coeffs));
yading@10:     memset(delay,  0, sizeof(delay));
yading@10:     for (i = 0; i < length; i++) {
yading@10:         dotprod = 0;
yading@10:         sign = APESIGN(buffer[i]);
yading@10:         for (j = 7; j >= 0; j--) {
yading@10:             dotprod += delay[j] * coeffs[j];
yading@10:             coeffs[j] -= (((delay[j] >> 30) & 2) - 1) * sign;
yading@10:         }
yading@10:         for (j = 7; j > 0; j--)
yading@10:             delay[j] = delay[j - 1];
yading@10:         delay[0] = buffer[i];
yading@10:         buffer[i] -= dotprod >> 9;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void predictor_decode_stereo_3800(APEContext *ctx, int count)
yading@10: {
yading@10:     APEPredictor *p = &ctx->predictor;
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10:     int32_t *decoded1 = ctx->decoded[1];
yading@10:     int32_t coeffs[256], delay[256];
yading@10:     int start = 4, shift = 10;
yading@10: 
yading@10:     if (ctx->compression_level == COMPRESSION_LEVEL_HIGH) {
yading@10:         start = 16;
yading@10:         long_filter_high_3800(decoded0, 16, 9, coeffs, delay, count);
yading@10:         long_filter_high_3800(decoded1, 16, 9, coeffs, delay, count);
yading@10:     } else if (ctx->compression_level == COMPRESSION_LEVEL_EXTRA_HIGH) {
yading@10:         int order = 128, shift2 = 11;
yading@10: 
yading@10:         if (ctx->fileversion >= 3830) {
yading@10:             order <<= 1;
yading@10:             shift++;
yading@10:             shift2++;
yading@10:             long_filter_ehigh_3830(decoded0 + order, count - order);
yading@10:             long_filter_ehigh_3830(decoded1 + order, count - order);
yading@10:         }
yading@10:         start = order;
yading@10:         long_filter_high_3800(decoded0, order, shift2, coeffs, delay, count);
yading@10:         long_filter_high_3800(decoded1, order, shift2, coeffs, delay, count);
yading@10:     }
yading@10: 
yading@10:     while (count--) {
yading@10:         int X = *decoded0, Y = *decoded1;
yading@10:         if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
yading@10:             *decoded0 = filter_fast_3320(p, Y, 0, YDELAYA);
yading@10:             decoded0++;
yading@10:             *decoded1 = filter_fast_3320(p, X, 1, XDELAYA);
yading@10:             decoded1++;
yading@10:         } else {
yading@10:             *decoded0 = filter_3800(p, Y, 0, YDELAYA, YDELAYB,
yading@10:                                     start, shift);
yading@10:             decoded0++;
yading@10:             *decoded1 = filter_3800(p, X, 1, XDELAYA, XDELAYB,
yading@10:                                     start, shift);
yading@10:             decoded1++;
yading@10:         }
yading@10: 
yading@10:         /* Combined */
yading@10:         p->buf++;
yading@10:         p->sample_pos++;
yading@10: 
yading@10:         /* Have we filled the history buffer? */
yading@10:         if (p->buf == p->historybuffer + HISTORY_SIZE) {
yading@10:             memmove(p->historybuffer, p->buf,
yading@10:                     PREDICTOR_SIZE * sizeof(*p->historybuffer));
yading@10:             p->buf = p->historybuffer;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void predictor_decode_mono_3800(APEContext *ctx, int count)
yading@10: {
yading@10:     APEPredictor *p = &ctx->predictor;
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10:     int32_t coeffs[256], delay[256];
yading@10:     int start = 4, shift = 10;
yading@10: 
yading@10:     if (ctx->compression_level == COMPRESSION_LEVEL_HIGH) {
yading@10:         start = 16;
yading@10:         long_filter_high_3800(decoded0, 16, 9, coeffs, delay, count);
yading@10:     } else if (ctx->compression_level == COMPRESSION_LEVEL_EXTRA_HIGH) {
yading@10:         int order = 128, shift2 = 11;
yading@10: 
yading@10:         if (ctx->fileversion >= 3830) {
yading@10:             order <<= 1;
yading@10:             shift++;
yading@10:             shift2++;
yading@10:             long_filter_ehigh_3830(decoded0 + order, count - order);
yading@10:         }
yading@10:         start = order;
yading@10:         long_filter_high_3800(decoded0, order, shift2, coeffs, delay, count);
yading@10:     }
yading@10: 
yading@10:     while (count--) {
yading@10:         if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
yading@10:             *decoded0 = filter_fast_3320(p, *decoded0, 0, YDELAYA);
yading@10:             decoded0++;
yading@10:         } else {
yading@10:             *decoded0 = filter_3800(p, *decoded0, 0, YDELAYA, YDELAYB,
yading@10:                                     start, shift);
yading@10:             decoded0++;
yading@10:         }
yading@10: 
yading@10:         /* Combined */
yading@10:         p->buf++;
yading@10:         p->sample_pos++;
yading@10: 
yading@10:         /* Have we filled the history buffer? */
yading@10:         if (p->buf == p->historybuffer + HISTORY_SIZE) {
yading@10:             memmove(p->historybuffer, p->buf,
yading@10:                     PREDICTOR_SIZE * sizeof(*p->historybuffer));
yading@10:             p->buf = p->historybuffer;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static av_always_inline int predictor_update_3930(APEPredictor *p,
yading@10:                                                   const int decoded, const int filter,
yading@10:                                                   const int delayA)
yading@10: {
yading@10:     int32_t predictionA, sign;
yading@10:     int32_t d0, d1, d2, d3;
yading@10: 
yading@10:     p->buf[delayA]     = p->lastA[filter];
yading@10:     d0 = p->buf[delayA    ];
yading@10:     d1 = p->buf[delayA    ] - p->buf[delayA - 1];
yading@10:     d2 = p->buf[delayA - 1] - p->buf[delayA - 2];
yading@10:     d3 = p->buf[delayA - 2] - p->buf[delayA - 3];
yading@10: 
yading@10:     predictionA = d0 * p->coeffsA[filter][0] +
yading@10:                   d1 * p->coeffsA[filter][1] +
yading@10:                   d2 * p->coeffsA[filter][2] +
yading@10:                   d3 * p->coeffsA[filter][3];
yading@10: 
yading@10:     p->lastA[filter] = decoded + (predictionA >> 9);
yading@10:     p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5);
yading@10: 
yading@10:     sign = APESIGN(decoded);
yading@10:     p->coeffsA[filter][0] += ((d0 < 0) * 2 - 1) * sign;
yading@10:     p->coeffsA[filter][1] += ((d1 < 0) * 2 - 1) * sign;
yading@10:     p->coeffsA[filter][2] += ((d2 < 0) * 2 - 1) * sign;
yading@10:     p->coeffsA[filter][3] += ((d3 < 0) * 2 - 1) * sign;
yading@10: 
yading@10:     return p->filterA[filter];
yading@10: }
yading@10: 
yading@10: static void predictor_decode_stereo_3930(APEContext *ctx, int count)
yading@10: {
yading@10:     APEPredictor *p = &ctx->predictor;
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10:     int32_t *decoded1 = ctx->decoded[1];
yading@10: 
yading@10:     ape_apply_filters(ctx, ctx->decoded[0], ctx->decoded[1], count);
yading@10: 
yading@10:     while (count--) {
yading@10:         /* Predictor Y */
yading@10:         int Y = *decoded1, X = *decoded0;
yading@10:         *decoded0 = predictor_update_3930(p, Y, 0, YDELAYA);
yading@10:         decoded0++;
yading@10:         *decoded1 = predictor_update_3930(p, X, 1, XDELAYA);
yading@10:         decoded1++;
yading@10: 
yading@10:         /* Combined */
yading@10:         p->buf++;
yading@10: 
yading@10:         /* Have we filled the history buffer? */
yading@10:         if (p->buf == p->historybuffer + HISTORY_SIZE) {
yading@10:             memmove(p->historybuffer, p->buf,
yading@10:                     PREDICTOR_SIZE * sizeof(*p->historybuffer));
yading@10:             p->buf = p->historybuffer;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void predictor_decode_mono_3930(APEContext *ctx, int count)
yading@10: {
yading@10:     APEPredictor *p = &ctx->predictor;
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10: 
yading@10:     ape_apply_filters(ctx, ctx->decoded[0], NULL, count);
yading@10: 
yading@10:     while (count--) {
yading@10:         *decoded0 = predictor_update_3930(p, *decoded0, 0, YDELAYA);
yading@10:         decoded0++;
yading@10: 
yading@10:         p->buf++;
yading@10: 
yading@10:         /* Have we filled the history buffer? */
yading@10:         if (p->buf == p->historybuffer + HISTORY_SIZE) {
yading@10:             memmove(p->historybuffer, p->buf,
yading@10:                     PREDICTOR_SIZE * sizeof(*p->historybuffer));
yading@10:             p->buf = p->historybuffer;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static av_always_inline int predictor_update_filter(APEPredictor *p,
yading@10:                                                     const int decoded, const int filter,
yading@10:                                                     const int delayA,  const int delayB,
yading@10:                                                     const int adaptA,  const int adaptB)
yading@10: {
yading@10:     int32_t predictionA, predictionB, sign;
yading@10: 
yading@10:     p->buf[delayA]     = p->lastA[filter];
yading@10:     p->buf[adaptA]     = APESIGN(p->buf[delayA]);
yading@10:     p->buf[delayA - 1] = p->buf[delayA] - p->buf[delayA - 1];
yading@10:     p->buf[adaptA - 1] = APESIGN(p->buf[delayA - 1]);
yading@10: 
yading@10:     predictionA = p->buf[delayA    ] * p->coeffsA[filter][0] +
yading@10:                   p->buf[delayA - 1] * p->coeffsA[filter][1] +
yading@10:                   p->buf[delayA - 2] * p->coeffsA[filter][2] +
yading@10:                   p->buf[delayA - 3] * p->coeffsA[filter][3];
yading@10: 
yading@10:     /*  Apply a scaled first-order filter compression */
yading@10:     p->buf[delayB]     = p->filterA[filter ^ 1] - ((p->filterB[filter] * 31) >> 5);
yading@10:     p->buf[adaptB]     = APESIGN(p->buf[delayB]);
yading@10:     p->buf[delayB - 1] = p->buf[delayB] - p->buf[delayB - 1];
yading@10:     p->buf[adaptB - 1] = APESIGN(p->buf[delayB - 1]);
yading@10:     p->filterB[filter] = p->filterA[filter ^ 1];
yading@10: 
yading@10:     predictionB = p->buf[delayB    ] * p->coeffsB[filter][0] +
yading@10:                   p->buf[delayB - 1] * p->coeffsB[filter][1] +
yading@10:                   p->buf[delayB - 2] * p->coeffsB[filter][2] +
yading@10:                   p->buf[delayB - 3] * p->coeffsB[filter][3] +
yading@10:                   p->buf[delayB - 4] * p->coeffsB[filter][4];
yading@10: 
yading@10:     p->lastA[filter] = decoded + ((predictionA + (predictionB >> 1)) >> 10);
yading@10:     p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5);
yading@10: 
yading@10:     sign = APESIGN(decoded);
yading@10:     p->coeffsA[filter][0] += p->buf[adaptA    ] * sign;
yading@10:     p->coeffsA[filter][1] += p->buf[adaptA - 1] * sign;
yading@10:     p->coeffsA[filter][2] += p->buf[adaptA - 2] * sign;
yading@10:     p->coeffsA[filter][3] += p->buf[adaptA - 3] * sign;
yading@10:     p->coeffsB[filter][0] += p->buf[adaptB    ] * sign;
yading@10:     p->coeffsB[filter][1] += p->buf[adaptB - 1] * sign;
yading@10:     p->coeffsB[filter][2] += p->buf[adaptB - 2] * sign;
yading@10:     p->coeffsB[filter][3] += p->buf[adaptB - 3] * sign;
yading@10:     p->coeffsB[filter][4] += p->buf[adaptB - 4] * sign;
yading@10: 
yading@10:     return p->filterA[filter];
yading@10: }
yading@10: 
yading@10: static void predictor_decode_stereo_3950(APEContext *ctx, int count)
yading@10: {
yading@10:     APEPredictor *p = &ctx->predictor;
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10:     int32_t *decoded1 = ctx->decoded[1];
yading@10: 
yading@10:     ape_apply_filters(ctx, ctx->decoded[0], ctx->decoded[1], count);
yading@10: 
yading@10:     while (count--) {
yading@10:         /* Predictor Y */
yading@10:         *decoded0 = predictor_update_filter(p, *decoded0, 0, YDELAYA, YDELAYB,
yading@10:                                             YADAPTCOEFFSA, YADAPTCOEFFSB);
yading@10:         decoded0++;
yading@10:         *decoded1 = predictor_update_filter(p, *decoded1, 1, XDELAYA, XDELAYB,
yading@10:                                             XADAPTCOEFFSA, XADAPTCOEFFSB);
yading@10:         decoded1++;
yading@10: 
yading@10:         /* Combined */
yading@10:         p->buf++;
yading@10: 
yading@10:         /* Have we filled the history buffer? */
yading@10:         if (p->buf == p->historybuffer + HISTORY_SIZE) {
yading@10:             memmove(p->historybuffer, p->buf,
yading@10:                     PREDICTOR_SIZE * sizeof(*p->historybuffer));
yading@10:             p->buf = p->historybuffer;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void predictor_decode_mono_3950(APEContext *ctx, int count)
yading@10: {
yading@10:     APEPredictor *p = &ctx->predictor;
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10:     int32_t predictionA, currentA, A, sign;
yading@10: 
yading@10:     ape_apply_filters(ctx, ctx->decoded[0], NULL, count);
yading@10: 
yading@10:     currentA = p->lastA[0];
yading@10: 
yading@10:     while (count--) {
yading@10:         A = *decoded0;
yading@10: 
yading@10:         p->buf[YDELAYA] = currentA;
yading@10:         p->buf[YDELAYA - 1] = p->buf[YDELAYA] - p->buf[YDELAYA - 1];
yading@10: 
yading@10:         predictionA = p->buf[YDELAYA    ] * p->coeffsA[0][0] +
yading@10:                       p->buf[YDELAYA - 1] * p->coeffsA[0][1] +
yading@10:                       p->buf[YDELAYA - 2] * p->coeffsA[0][2] +
yading@10:                       p->buf[YDELAYA - 3] * p->coeffsA[0][3];
yading@10: 
yading@10:         currentA = A + (predictionA >> 10);
yading@10: 
yading@10:         p->buf[YADAPTCOEFFSA]     = APESIGN(p->buf[YDELAYA    ]);
yading@10:         p->buf[YADAPTCOEFFSA - 1] = APESIGN(p->buf[YDELAYA - 1]);
yading@10: 
yading@10:         sign = APESIGN(A);
yading@10:         p->coeffsA[0][0] += p->buf[YADAPTCOEFFSA    ] * sign;
yading@10:         p->coeffsA[0][1] += p->buf[YADAPTCOEFFSA - 1] * sign;
yading@10:         p->coeffsA[0][2] += p->buf[YADAPTCOEFFSA - 2] * sign;
yading@10:         p->coeffsA[0][3] += p->buf[YADAPTCOEFFSA - 3] * sign;
yading@10: 
yading@10:         p->buf++;
yading@10: 
yading@10:         /* Have we filled the history buffer? */
yading@10:         if (p->buf == p->historybuffer + HISTORY_SIZE) {
yading@10:             memmove(p->historybuffer, p->buf,
yading@10:                     PREDICTOR_SIZE * sizeof(*p->historybuffer));
yading@10:             p->buf = p->historybuffer;
yading@10:         }
yading@10: 
yading@10:         p->filterA[0] = currentA + ((p->filterA[0] * 31) >> 5);
yading@10:         *(decoded0++) = p->filterA[0];
yading@10:     }
yading@10: 
yading@10:     p->lastA[0] = currentA;
yading@10: }
yading@10: 
yading@10: static void do_init_filter(APEFilter *f, int16_t *buf, int order)
yading@10: {
yading@10:     f->coeffs = buf;
yading@10:     f->historybuffer = buf + order;
yading@10:     f->delay       = f->historybuffer + order * 2;
yading@10:     f->adaptcoeffs = f->historybuffer + order;
yading@10: 
yading@10:     memset(f->historybuffer, 0, (order * 2) * sizeof(*f->historybuffer));
yading@10:     memset(f->coeffs, 0, order * sizeof(*f->coeffs));
yading@10:     f->avg = 0;
yading@10: }
yading@10: 
yading@10: static void init_filter(APEContext *ctx, APEFilter *f, int16_t *buf, int order)
yading@10: {
yading@10:     do_init_filter(&f[0], buf, order);
yading@10:     do_init_filter(&f[1], buf + order * 3 + HISTORY_SIZE, order);
yading@10: }
yading@10: 
yading@10: static void do_apply_filter(APEContext *ctx, int version, APEFilter *f,
yading@10:                             int32_t *data, int count, int order, int fracbits)
yading@10: {
yading@10:     int res;
yading@10:     int absres;
yading@10: 
yading@10:     while (count--) {
yading@10:         /* round fixedpoint scalar product */
yading@10:         res = ctx->dsp.scalarproduct_and_madd_int16(f->coeffs, f->delay - order,
yading@10:                                                     f->adaptcoeffs - order,
yading@10:                                                     order, APESIGN(*data));
yading@10:         res = (res + (1 << (fracbits - 1))) >> fracbits;
yading@10:         res += *data;
yading@10:         *data++ = res;
yading@10: 
yading@10:         /* Update the output history */
yading@10:         *f->delay++ = av_clip_int16(res);
yading@10: 
yading@10:         if (version < 3980) {
yading@10:             /* Version ??? to < 3.98 files (untested) */
yading@10:             f->adaptcoeffs[0]  = (res == 0) ? 0 : ((res >> 28) & 8) - 4;
yading@10:             f->adaptcoeffs[-4] >>= 1;
yading@10:             f->adaptcoeffs[-8] >>= 1;
yading@10:         } else {
yading@10:             /* Version 3.98 and later files */
yading@10: 
yading@10:             /* Update the adaption coefficients */
yading@10:             absres = FFABS(res);
yading@10:             if (absres)
yading@10:                 *f->adaptcoeffs = ((res & (-1<<31)) ^ (-1<<30)) >>
yading@10:                                   (25 + (absres <= f->avg*3) + (absres <= f->avg*4/3));
yading@10:             else
yading@10:                 *f->adaptcoeffs = 0;
yading@10: 
yading@10:             f->avg += (absres - f->avg) / 16;
yading@10: 
yading@10:             f->adaptcoeffs[-1] >>= 1;
yading@10:             f->adaptcoeffs[-2] >>= 1;
yading@10:             f->adaptcoeffs[-8] >>= 1;
yading@10:         }
yading@10: 
yading@10:         f->adaptcoeffs++;
yading@10: 
yading@10:         /* Have we filled the history buffer? */
yading@10:         if (f->delay == f->historybuffer + HISTORY_SIZE + (order * 2)) {
yading@10:             memmove(f->historybuffer, f->delay - (order * 2),
yading@10:                     (order * 2) * sizeof(*f->historybuffer));
yading@10:             f->delay = f->historybuffer + order * 2;
yading@10:             f->adaptcoeffs = f->historybuffer + order;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void apply_filter(APEContext *ctx, APEFilter *f,
yading@10:                          int32_t *data0, int32_t *data1,
yading@10:                          int count, int order, int fracbits)
yading@10: {
yading@10:     do_apply_filter(ctx, ctx->fileversion, &f[0], data0, count, order, fracbits);
yading@10:     if (data1)
yading@10:         do_apply_filter(ctx, ctx->fileversion, &f[1], data1, count, order, fracbits);
yading@10: }
yading@10: 
yading@10: static void ape_apply_filters(APEContext *ctx, int32_t *decoded0,
yading@10:                               int32_t *decoded1, int count)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < APE_FILTER_LEVELS; i++) {
yading@10:         if (!ape_filter_orders[ctx->fset][i])
yading@10:             break;
yading@10:         apply_filter(ctx, ctx->filters[i], decoded0, decoded1, count,
yading@10:                      ape_filter_orders[ctx->fset][i],
yading@10:                      ape_filter_fracbits[ctx->fset][i]);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int init_frame_decoder(APEContext *ctx)
yading@10: {
yading@10:     int i, ret;
yading@10:     if ((ret = init_entropy_decoder(ctx)) < 0)
yading@10:         return ret;
yading@10:     init_predictor_decoder(ctx);
yading@10: 
yading@10:     for (i = 0; i < APE_FILTER_LEVELS; i++) {
yading@10:         if (!ape_filter_orders[ctx->fset][i])
yading@10:             break;
yading@10:         init_filter(ctx, ctx->filters[i], ctx->filterbuf[i],
yading@10:                     ape_filter_orders[ctx->fset][i]);
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void ape_unpack_mono(APEContext *ctx, int count)
yading@10: {
yading@10:     if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
yading@10:         /* We are pure silence, so we're done. */
yading@10:         av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence mono\n");
yading@10:         return;
yading@10:     }
yading@10: 
yading@10:     ctx->entropy_decode_mono(ctx, count);
yading@10: 
yading@10:     /* Now apply the predictor decoding */
yading@10:     ctx->predictor_decode_mono(ctx, count);
yading@10: 
yading@10:     /* Pseudo-stereo - just copy left channel to right channel */
yading@10:     if (ctx->channels == 2) {
yading@10:         memcpy(ctx->decoded[1], ctx->decoded[0], count * sizeof(*ctx->decoded[1]));
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void ape_unpack_stereo(APEContext *ctx, int count)
yading@10: {
yading@10:     int32_t left, right;
yading@10:     int32_t *decoded0 = ctx->decoded[0];
yading@10:     int32_t *decoded1 = ctx->decoded[1];
yading@10: 
yading@10:     if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
yading@10:         /* We are pure silence, so we're done. */
yading@10:         av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence stereo\n");
yading@10:         return;
yading@10:     }
yading@10: 
yading@10:     ctx->entropy_decode_stereo(ctx, count);
yading@10: 
yading@10:     /* Now apply the predictor decoding */
yading@10:     ctx->predictor_decode_stereo(ctx, count);
yading@10: 
yading@10:     /* Decorrelate and scale to output depth */
yading@10:     while (count--) {
yading@10:         left = *decoded1 - (*decoded0 / 2);
yading@10:         right = left + *decoded0;
yading@10: 
yading@10:         *(decoded0++) = left;
yading@10:         *(decoded1++) = right;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int ape_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                             int *got_frame_ptr, AVPacket *avpkt)
yading@10: {
yading@10:     AVFrame *frame     = data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     APEContext *s = avctx->priv_data;
yading@10:     uint8_t *sample8;
yading@10:     int16_t *sample16;
yading@10:     int32_t *sample24;
yading@10:     int i, ch, ret;
yading@10:     int blockstodecode;
yading@10: 
yading@10:     /* this should never be negative, but bad things will happen if it is, so
yading@10:        check it just to make sure. */
yading@10:     av_assert0(s->samples >= 0);
yading@10: 
yading@10:     if(!s->samples){
yading@10:         uint32_t nblocks, offset;
yading@10:         int buf_size;
yading@10: 
yading@10:         if (!avpkt->size) {
yading@10:             *got_frame_ptr = 0;
yading@10:             return 0;
yading@10:         }
yading@10:         if (avpkt->size < 8) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         buf_size = avpkt->size & ~3;
yading@10:         if (buf_size != avpkt->size) {
yading@10:             av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
yading@10:                    "extra bytes at the end will be skipped.\n");
yading@10:         }
yading@10:         if (s->fileversion < 3950) // previous versions overread two bytes
yading@10:             buf_size += 2;
yading@10:         av_fast_malloc(&s->data, &s->data_size, buf_size);
yading@10:         if (!s->data)
yading@10:             return AVERROR(ENOMEM);
yading@10:         s->dsp.bswap_buf((uint32_t*)s->data, (const uint32_t*)buf, buf_size >> 2);
yading@10:         memset(s->data + (buf_size & ~3), 0, buf_size & 3);
yading@10:         s->ptr = s->data;
yading@10:         s->data_end = s->data + buf_size;
yading@10: 
yading@10:         nblocks = bytestream_get_be32(&s->ptr);
yading@10:         offset  = bytestream_get_be32(&s->ptr);
yading@10:         if (s->fileversion >= 3900) {
yading@10:             if (offset > 3) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Incorrect offset passed\n");
yading@10:                 s->data = NULL;
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:             if (s->data_end - s->ptr < offset) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:             s->ptr += offset;
yading@10:         } else {
yading@10:             init_get_bits(&s->gb, s->ptr, (s->data_end - s->ptr) * 8);
yading@10:             if (s->fileversion > 3800)
yading@10:                 skip_bits_long(&s->gb, offset * 8);
yading@10:             else
yading@10:                 skip_bits_long(&s->gb, offset);
yading@10:         }
yading@10: 
yading@10:         if (!nblocks || nblocks > INT_MAX) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Invalid sample count: %u.\n", nblocks);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         s->samples = nblocks;
yading@10: 
yading@10:         /* Initialize the frame decoder */
yading@10:         if (init_frame_decoder(s) < 0) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Error reading frame header\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (!s->data) {
yading@10:         *got_frame_ptr = 0;
yading@10:         return avpkt->size;
yading@10:     }
yading@10: 
yading@10:     blockstodecode = FFMIN(s->blocks_per_loop, s->samples);
yading@10:     // for old files coefficients were not interleaved,
yading@10:     // so we need to decode all of them at once
yading@10:     if (s->fileversion < 3930)
yading@10:         blockstodecode = s->samples;
yading@10: 
yading@10:     /* reallocate decoded sample buffer if needed */
yading@10:     av_fast_malloc(&s->decoded_buffer, &s->decoded_size,
yading@10:                    2 * FFALIGN(blockstodecode, 8) * sizeof(*s->decoded_buffer));
yading@10:     if (!s->decoded_buffer)
yading@10:         return AVERROR(ENOMEM);
yading@10:     memset(s->decoded_buffer, 0, s->decoded_size);
yading@10:     s->decoded[0] = s->decoded_buffer;
yading@10:     s->decoded[1] = s->decoded_buffer + FFALIGN(blockstodecode, 8);
yading@10: 
yading@10:     /* get output buffer */
yading@10:     frame->nb_samples = blockstodecode;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     s->error=0;
yading@10: 
yading@10:     if ((s->channels == 1) || (s->frameflags & APE_FRAMECODE_PSEUDO_STEREO))
yading@10:         ape_unpack_mono(s, blockstodecode);
yading@10:     else
yading@10:         ape_unpack_stereo(s, blockstodecode);
yading@10:     emms_c();
yading@10: 
yading@10:     if (s->error) {
yading@10:         s->samples=0;
yading@10:         av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     switch (s->bps) {
yading@10:     case 8:
yading@10:         for (ch = 0; ch < s->channels; ch++) {
yading@10:             sample8 = (uint8_t *)frame->data[ch];
yading@10:             for (i = 0; i < blockstodecode; i++)
yading@10:                 *sample8++ = (s->decoded[ch][i] + 0x80) & 0xff;
yading@10:         }
yading@10:         break;
yading@10:     case 16:
yading@10:         for (ch = 0; ch < s->channels; ch++) {
yading@10:             sample16 = (int16_t *)frame->data[ch];
yading@10:             for (i = 0; i < blockstodecode; i++)
yading@10:                 *sample16++ = s->decoded[ch][i];
yading@10:         }
yading@10:         break;
yading@10:     case 24:
yading@10:         for (ch = 0; ch < s->channels; ch++) {
yading@10:             sample24 = (int32_t *)frame->data[ch];
yading@10:             for (i = 0; i < blockstodecode; i++)
yading@10:                 *sample24++ = s->decoded[ch][i] << 8;
yading@10:         }
yading@10:         break;
yading@10:     }
yading@10: 
yading@10:     s->samples -= blockstodecode;
yading@10: 
yading@10:     *got_frame_ptr = 1;
yading@10: 
yading@10:     return !s->samples ? avpkt->size : 0;
yading@10: }
yading@10: 
yading@10: static void ape_flush(AVCodecContext *avctx)
yading@10: {
yading@10:     APEContext *s = avctx->priv_data;
yading@10:     s->samples= 0;
yading@10: }
yading@10: 
yading@10: #define OFFSET(x) offsetof(APEContext, x)
yading@10: #define PAR (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
yading@10: static const AVOption options[] = {
yading@10:     { "max_samples", "maximum number of samples decoded per call",             OFFSET(blocks_per_loop), AV_OPT_TYPE_INT,   { .i64 = 4608 },    1,       INT_MAX, PAR, "max_samples" },
yading@10:     { "all",         "no maximum. decode all samples for each packet at once", 0,                       AV_OPT_TYPE_CONST, { .i64 = INT_MAX }, INT_MIN, INT_MAX, PAR, "max_samples" },
yading@10:     { NULL},
yading@10: };
yading@10: 
yading@10: static const AVClass ape_decoder_class = {
yading@10:     .class_name = "APE decoder",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVCodec ff_ape_decoder = {
yading@10:     .name           = "ape",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_APE,
yading@10:     .priv_data_size = sizeof(APEContext),
yading@10:     .init           = ape_decode_init,
yading@10:     .close          = ape_decode_close,
yading@10:     .decode         = ape_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1,
yading@10:     .flush          = ape_flush,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
yading@10:     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
yading@10:                                                       AV_SAMPLE_FMT_S16P,
yading@10:                                                       AV_SAMPLE_FMT_S32P,
yading@10:                                                       AV_SAMPLE_FMT_NONE },
yading@10:     .priv_class     = &ape_decoder_class,
yading@10: };