yading@10: /*
yading@10:  * WavPack lossless audio decoder
yading@10:  * Copyright (c) 2006,2011 Konstantin Shishkov
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: #define BITSTREAM_READER_LE
yading@10: 
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: #include "internal.h"
yading@10: #include "unary.h"
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * WavPack lossless audio decoder
yading@10:  */
yading@10: 
yading@10: #define WV_MONO           0x00000004
yading@10: #define WV_JOINT_STEREO   0x00000010
yading@10: #define WV_FALSE_STEREO   0x40000000
yading@10: 
yading@10: #define WV_HYBRID_MODE    0x00000008
yading@10: #define WV_HYBRID_SHAPE   0x00000008
yading@10: #define WV_HYBRID_BITRATE 0x00000200
yading@10: #define WV_HYBRID_BALANCE 0x00000400
yading@10: 
yading@10: #define WV_FLT_SHIFT_ONES 0x01
yading@10: #define WV_FLT_SHIFT_SAME 0x02
yading@10: #define WV_FLT_SHIFT_SENT 0x04
yading@10: #define WV_FLT_ZERO_SENT  0x08
yading@10: #define WV_FLT_ZERO_SIGN  0x10
yading@10: 
yading@10: #define WV_MAX_SAMPLES    131072
yading@10: 
yading@10: enum WP_ID_Flags {
yading@10:     WP_IDF_MASK   = 0x1F,
yading@10:     WP_IDF_IGNORE = 0x20,
yading@10:     WP_IDF_ODD    = 0x40,
yading@10:     WP_IDF_LONG   = 0x80
yading@10: };
yading@10: 
yading@10: enum WP_ID {
yading@10:     WP_ID_DUMMY = 0,
yading@10:     WP_ID_ENCINFO,
yading@10:     WP_ID_DECTERMS,
yading@10:     WP_ID_DECWEIGHTS,
yading@10:     WP_ID_DECSAMPLES,
yading@10:     WP_ID_ENTROPY,
yading@10:     WP_ID_HYBRID,
yading@10:     WP_ID_SHAPING,
yading@10:     WP_ID_FLOATINFO,
yading@10:     WP_ID_INT32INFO,
yading@10:     WP_ID_DATA,
yading@10:     WP_ID_CORR,
yading@10:     WP_ID_EXTRABITS,
yading@10:     WP_ID_CHANINFO
yading@10: };
yading@10: 
yading@10: typedef struct SavedContext {
yading@10:     int offset;
yading@10:     int size;
yading@10:     int bits_used;
yading@10:     uint32_t crc;
yading@10: } SavedContext;
yading@10: 
yading@10: #define MAX_TERMS 16
yading@10: 
yading@10: typedef struct Decorr {
yading@10:     int delta;
yading@10:     int value;
yading@10:     int weightA;
yading@10:     int weightB;
yading@10:     int samplesA[8];
yading@10:     int samplesB[8];
yading@10: } Decorr;
yading@10: 
yading@10: typedef struct WvChannel {
yading@10:     int median[3];
yading@10:     int slow_level, error_limit;
yading@10:     int bitrate_acc, bitrate_delta;
yading@10: } WvChannel;
yading@10: 
yading@10: typedef struct WavpackFrameContext {
yading@10:     AVCodecContext *avctx;
yading@10:     int frame_flags;
yading@10:     int stereo, stereo_in;
yading@10:     int joint;
yading@10:     uint32_t CRC;
yading@10:     GetBitContext gb;
yading@10:     int got_extra_bits;
yading@10:     uint32_t crc_extra_bits;
yading@10:     GetBitContext gb_extra_bits;
yading@10:     int data_size; // in bits
yading@10:     int samples;
yading@10:     int terms;
yading@10:     Decorr decorr[MAX_TERMS];
yading@10:     int zero, one, zeroes;
yading@10:     int extra_bits;
yading@10:     int and, or, shift;
yading@10:     int post_shift;
yading@10:     int hybrid, hybrid_bitrate;
yading@10:     int hybrid_maxclip, hybrid_minclip;
yading@10:     int float_flag;
yading@10:     int float_shift;
yading@10:     int float_max_exp;
yading@10:     WvChannel ch[2];
yading@10:     int pos;
yading@10:     SavedContext sc, extra_sc;
yading@10: } WavpackFrameContext;
yading@10: 
yading@10: #define WV_MAX_FRAME_DECODERS 14
yading@10: 
yading@10: typedef struct WavpackContext {
yading@10:     AVCodecContext *avctx;
yading@10: 
yading@10:     WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS];
yading@10:     int fdec_num;
yading@10: 
yading@10:     int multichannel;
yading@10:     int mkv_mode;
yading@10:     int block;
yading@10:     int samples;
yading@10:     int ch_offset;
yading@10: } WavpackContext;
yading@10: 
yading@10: // exponent table copied from WavPack source
yading@10: static const uint8_t wp_exp2_table [256] = {
yading@10:     0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b,
yading@10:     0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16,
yading@10:     0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23,
yading@10:     0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
yading@10:     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d,
yading@10:     0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b,
yading@10:     0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
yading@10:     0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
yading@10:     0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
yading@10:     0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a,
yading@10:     0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
yading@10:     0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad,
yading@10:     0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
yading@10:     0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4,
yading@10:     0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9,
yading@10:     0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff
yading@10: };
yading@10: 
yading@10: static const uint8_t wp_log2_table [] = {
yading@10:     0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15,
yading@10:     0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a,
yading@10:     0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e,
yading@10:     0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51,
yading@10:     0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63,
yading@10:     0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75,
yading@10:     0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85,
yading@10:     0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95,
yading@10:     0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,
yading@10:     0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2,
yading@10:     0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0,
yading@10:     0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce,
yading@10:     0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb,
yading@10:     0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7,
yading@10:     0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4,
yading@10:     0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff
yading@10: };
yading@10: 
yading@10: static av_always_inline int wp_exp2(int16_t val)
yading@10: {
yading@10:     int res, neg = 0;
yading@10: 
yading@10:     if (val < 0) {
yading@10:         val = -val;
yading@10:         neg = 1;
yading@10:     }
yading@10: 
yading@10:     res = wp_exp2_table[val & 0xFF] | 0x100;
yading@10:     val >>= 8;
yading@10:     res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
yading@10:     return neg ? -res : res;
yading@10: }
yading@10: 
yading@10: static av_always_inline int wp_log2(int32_t val)
yading@10: {
yading@10:     int bits;
yading@10: 
yading@10:     if (!val)
yading@10:         return 0;
yading@10:     if (val == 1)
yading@10:         return 256;
yading@10:     val += val >> 9;
yading@10:     bits = av_log2(val) + 1;
yading@10:     if (bits < 9)
yading@10:         return (bits << 8) + wp_log2_table[(val << (9 - bits)) & 0xFF];
yading@10:     else
yading@10:         return (bits << 8) + wp_log2_table[(val >> (bits - 9)) & 0xFF];
yading@10: }
yading@10: 
yading@10: #define LEVEL_DECAY(a)  ((a + 0x80) >> 8)
yading@10: 
yading@10: // macros for manipulating median values
yading@10: #define GET_MED(n) ((c->median[n] >> 4) + 1)
yading@10: #define DEC_MED(n) c->median[n] -= ((c->median[n] + (128 >> n) - 2) / (128 >> n)) * 2
yading@10: #define INC_MED(n) c->median[n] += ((c->median[n] + (128 >> n)    ) / (128 >> n)) * 5
yading@10: 
yading@10: // macros for applying weight
yading@10: #define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \
yading@10:     if (samples && in) { \
yading@10:         if ((samples ^ in) < 0) { \
yading@10:             weight -= delta; \
yading@10:             if (weight < -1024) \
yading@10:                 weight = -1024; \
yading@10:         } else { \
yading@10:             weight += delta; \
yading@10:             if (weight > 1024) \
yading@10:                 weight = 1024; \
yading@10:         } \
yading@10:     }
yading@10: 
yading@10: 
yading@10: static av_always_inline int get_tail(GetBitContext *gb, int k)
yading@10: {
yading@10:     int p, e, res;
yading@10: 
yading@10:     if (k < 1)
yading@10:         return 0;
yading@10:     p = av_log2(k);
yading@10:     e = (1 << (p + 1)) - k - 1;
yading@10:     res = p ? get_bits(gb, p) : 0;
yading@10:     if (res >= e)
yading@10:         res = (res << 1) - e + get_bits1(gb);
yading@10:     return res;
yading@10: }
yading@10: 
yading@10: static void update_error_limit(WavpackFrameContext *ctx)
yading@10: {
yading@10:     int i, br[2], sl[2];
yading@10: 
yading@10:     for (i = 0; i <= ctx->stereo_in; i++) {
yading@10:         ctx->ch[i].bitrate_acc += ctx->ch[i].bitrate_delta;
yading@10:         br[i] = ctx->ch[i].bitrate_acc >> 16;
yading@10:         sl[i] = LEVEL_DECAY(ctx->ch[i].slow_level);
yading@10:     }
yading@10:     if (ctx->stereo_in && ctx->hybrid_bitrate) {
yading@10:         int balance = (sl[1] - sl[0] + br[1] + 1) >> 1;
yading@10:         if (balance > br[0]) {
yading@10:             br[1] = br[0] << 1;
yading@10:             br[0] = 0;
yading@10:         } else if (-balance > br[0]) {
yading@10:             br[0] <<= 1;
yading@10:             br[1] = 0;
yading@10:         } else {
yading@10:             br[1] = br[0] + balance;
yading@10:             br[0] = br[0] - balance;
yading@10:         }
yading@10:     }
yading@10:     for (i = 0; i <= ctx->stereo_in; i++) {
yading@10:         if (ctx->hybrid_bitrate) {
yading@10:             if (sl[i] - br[i] > -0x100)
yading@10:                 ctx->ch[i].error_limit = wp_exp2(sl[i] - br[i] + 0x100);
yading@10:             else
yading@10:                 ctx->ch[i].error_limit = 0;
yading@10:         } else {
yading@10:             ctx->ch[i].error_limit = wp_exp2(br[i]);
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int wv_get_value(WavpackFrameContext *ctx, GetBitContext *gb,
yading@10:                         int channel, int *last)
yading@10: {
yading@10:     int t, t2;
yading@10:     int sign, base, add, ret;
yading@10:     WvChannel *c = &ctx->ch[channel];
yading@10: 
yading@10:     *last = 0;
yading@10: 
yading@10:     if ((ctx->ch[0].median[0] < 2U) && (ctx->ch[1].median[0] < 2U) &&
yading@10:         !ctx->zero && !ctx->one) {
yading@10:         if (ctx->zeroes) {
yading@10:             ctx->zeroes--;
yading@10:             if (ctx->zeroes) {
yading@10:                 c->slow_level -= LEVEL_DECAY(c->slow_level);
yading@10:                 return 0;
yading@10:             }
yading@10:         } else {
yading@10:             t = get_unary_0_33(gb);
yading@10:             if (t >= 2) {
yading@10:                 if (get_bits_left(gb) < t - 1)
yading@10:                     goto error;
yading@10:                 t = get_bits(gb, t - 1) | (1 << (t-1));
yading@10:             } else {
yading@10:                 if (get_bits_left(gb) < 0)
yading@10:                     goto error;
yading@10:             }
yading@10:             ctx->zeroes = t;
yading@10:             if (ctx->zeroes) {
yading@10:                 memset(ctx->ch[0].median, 0, sizeof(ctx->ch[0].median));
yading@10:                 memset(ctx->ch[1].median, 0, sizeof(ctx->ch[1].median));
yading@10:                 c->slow_level -= LEVEL_DECAY(c->slow_level);
yading@10:                 return 0;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (ctx->zero) {
yading@10:         t = 0;
yading@10:         ctx->zero = 0;
yading@10:     } else {
yading@10:         t = get_unary_0_33(gb);
yading@10:         if (get_bits_left(gb) < 0)
yading@10:             goto error;
yading@10:         if (t == 16) {
yading@10:             t2 = get_unary_0_33(gb);
yading@10:             if (t2 < 2) {
yading@10:                 if (get_bits_left(gb) < 0)
yading@10:                     goto error;
yading@10:                 t += t2;
yading@10:             } else {
yading@10:                 if (get_bits_left(gb) < t2 - 1)
yading@10:                     goto error;
yading@10:                 t += get_bits(gb, t2 - 1) | (1 << (t2 - 1));
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         if (ctx->one) {
yading@10:             ctx->one = t & 1;
yading@10:             t = (t >> 1) + 1;
yading@10:         } else {
yading@10:             ctx->one = t & 1;
yading@10:             t >>= 1;
yading@10:         }
yading@10:         ctx->zero = !ctx->one;
yading@10:     }
yading@10: 
yading@10:     if (ctx->hybrid && !channel)
yading@10:         update_error_limit(ctx);
yading@10: 
yading@10:     if (!t) {
yading@10:         base = 0;
yading@10:         add  = GET_MED(0) - 1;
yading@10:         DEC_MED(0);
yading@10:     } else if (t == 1) {
yading@10:         base = GET_MED(0);
yading@10:         add  = GET_MED(1) - 1;
yading@10:         INC_MED(0);
yading@10:         DEC_MED(1);
yading@10:     } else if (t == 2) {
yading@10:         base = GET_MED(0) + GET_MED(1);
yading@10:         add  = GET_MED(2) - 1;
yading@10:         INC_MED(0);
yading@10:         INC_MED(1);
yading@10:         DEC_MED(2);
yading@10:     } else {
yading@10:         base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2);
yading@10:         add  = GET_MED(2) - 1;
yading@10:         INC_MED(0);
yading@10:         INC_MED(1);
yading@10:         INC_MED(2);
yading@10:     }
yading@10:     if (!c->error_limit) {
yading@10:         if (add >= 0x2000000U) {
yading@10:             av_log(ctx->avctx, AV_LOG_ERROR, "k %d is too large\n", add);
yading@10:             goto error;
yading@10:         }
yading@10:         ret = base + get_tail(gb, add);
yading@10:         if (get_bits_left(gb) <= 0)
yading@10:             goto error;
yading@10:     } else {
yading@10:         int mid = (base * 2 + add + 1) >> 1;
yading@10:         while (add > c->error_limit) {
yading@10:             if (get_bits_left(gb) <= 0)
yading@10:                 goto error;
yading@10:             if (get_bits1(gb)) {
yading@10:                 add -= (mid - base);
yading@10:                 base = mid;
yading@10:             } else
yading@10:                 add = mid - base - 1;
yading@10:             mid = (base * 2 + add + 1) >> 1;
yading@10:         }
yading@10:         ret = mid;
yading@10:     }
yading@10:     sign = get_bits1(gb);
yading@10:     if (ctx->hybrid_bitrate)
yading@10:         c->slow_level += wp_log2(ret) - LEVEL_DECAY(c->slow_level);
yading@10:     return sign ? ~ret : ret;
yading@10: 
yading@10: error:
yading@10:     *last = 1;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc,
yading@10:                                        int S)
yading@10: {
yading@10:     int bit;
yading@10: 
yading@10:     if (s->extra_bits){
yading@10:         S <<= s->extra_bits;
yading@10: 
yading@10:         if (s->got_extra_bits && get_bits_left(&s->gb_extra_bits) >= s->extra_bits) {
yading@10:             S |= get_bits(&s->gb_extra_bits, s->extra_bits);
yading@10:             *crc = *crc * 9 + (S & 0xffff) * 3 + ((unsigned)S >> 16);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     bit = (S & s->and) | s->or;
yading@10:     bit = ((S + bit) << s->shift) - bit;
yading@10: 
yading@10:     if (s->hybrid)
yading@10:         bit = av_clip(bit, s->hybrid_minclip, s->hybrid_maxclip);
yading@10: 
yading@10:     return bit << s->post_shift;
yading@10: }
yading@10: 
yading@10: static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S)
yading@10: {
yading@10:     union {
yading@10:         float    f;
yading@10:         uint32_t u;
yading@10:     } value;
yading@10: 
yading@10:     unsigned int sign;
yading@10:     int exp = s->float_max_exp;
yading@10: 
yading@10:     if (s->got_extra_bits) {
yading@10:         const int max_bits  = 1 + 23 + 8 + 1;
yading@10:         const int left_bits = get_bits_left(&s->gb_extra_bits);
yading@10: 
yading@10:         if (left_bits + 8 * FF_INPUT_BUFFER_PADDING_SIZE < max_bits)
yading@10:             return 0.0;
yading@10:     }
yading@10: 
yading@10:     if (S) {
yading@10:         S <<= s->float_shift;
yading@10:         sign = S < 0;
yading@10:         if (sign)
yading@10:             S = -S;
yading@10:         if (S >= 0x1000000) {
yading@10:             if (s->got_extra_bits && get_bits1(&s->gb_extra_bits))
yading@10:                 S = get_bits(&s->gb_extra_bits, 23);
yading@10:             else
yading@10:                 S = 0;
yading@10:             exp = 255;
yading@10:         } else if (exp) {
yading@10:             int shift = 23 - av_log2(S);
yading@10:             exp = s->float_max_exp;
yading@10:             if (exp <= shift)
yading@10:                 shift = --exp;
yading@10:             exp -= shift;
yading@10: 
yading@10:             if (shift) {
yading@10:                 S <<= shift;
yading@10:                 if ((s->float_flag & WV_FLT_SHIFT_ONES) ||
yading@10:                     (s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SAME) &&
yading@10:                      get_bits1(&s->gb_extra_bits))) {
yading@10:                     S |= (1 << shift) - 1;
yading@10:                 } else if (s->got_extra_bits &&
yading@10:                            (s->float_flag & WV_FLT_SHIFT_SENT)) {
yading@10:                     S |= get_bits(&s->gb_extra_bits, shift);
yading@10:                 }
yading@10:             }
yading@10:         } else {
yading@10:             exp = s->float_max_exp;
yading@10:         }
yading@10:         S &= 0x7fffff;
yading@10:     } else {
yading@10:         sign = 0;
yading@10:         exp = 0;
yading@10:         if (s->got_extra_bits && (s->float_flag & WV_FLT_ZERO_SENT)) {
yading@10:             if (get_bits1(&s->gb_extra_bits)) {
yading@10:                 S = get_bits(&s->gb_extra_bits, 23);
yading@10:                 if (s->float_max_exp >= 25)
yading@10:                     exp = get_bits(&s->gb_extra_bits, 8);
yading@10:                 sign = get_bits1(&s->gb_extra_bits);
yading@10:             } else {
yading@10:                 if (s->float_flag & WV_FLT_ZERO_SIGN)
yading@10:                     sign = get_bits1(&s->gb_extra_bits);
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     *crc = *crc * 27 + S * 9 + exp * 3 + sign;
yading@10: 
yading@10:     value.u = (sign << 31) | (exp << 23) | S;
yading@10:     return value.f;
yading@10: }
yading@10: 
yading@10: static void wv_reset_saved_context(WavpackFrameContext *s)
yading@10: {
yading@10:     s->pos = 0;
yading@10:     s->sc.crc = s->extra_sc.crc = 0xFFFFFFFF;
yading@10: }
yading@10: 
yading@10: static inline int wv_check_crc(WavpackFrameContext *s, uint32_t crc,
yading@10:                                uint32_t crc_extra_bits)
yading@10: {
yading@10:     if (crc != s->CRC) {
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (s->got_extra_bits && crc_extra_bits != s->crc_extra_bits) {
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb,
yading@10:                                    void *dst, const int type)
yading@10: {
yading@10:     int i, j, count = 0;
yading@10:     int last, t;
yading@10:     int A, B, L, L2, R, R2;
yading@10:     int pos = s->pos;
yading@10:     uint32_t crc = s->sc.crc;
yading@10:     uint32_t crc_extra_bits = s->extra_sc.crc;
yading@10:     int16_t *dst16 = dst;
yading@10:     int32_t *dst32 = dst;
yading@10:     float   *dstfl = dst;
yading@10:     const int channel_pad = s->avctx->channels - 2;
yading@10: 
yading@10:     s->one = s->zero = s->zeroes = 0;
yading@10:     do {
yading@10:         L = wv_get_value(s, gb, 0, &last);
yading@10:         if (last)
yading@10:             break;
yading@10:         R = wv_get_value(s, gb, 1, &last);
yading@10:         if (last)
yading@10:             break;
yading@10:         for (i = 0; i < s->terms; i++) {
yading@10:             t = s->decorr[i].value;
yading@10:             if (t > 0) {
yading@10:                 if (t > 8) {
yading@10:                     if (t & 1) {
yading@10:                         A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
yading@10:                         B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1];
yading@10:                     } else {
yading@10:                         A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
yading@10:                         B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1;
yading@10:                     }
yading@10:                     s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
yading@10:                     s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0];
yading@10:                     j = 0;
yading@10:                 } else {
yading@10:                     A = s->decorr[i].samplesA[pos];
yading@10:                     B = s->decorr[i].samplesB[pos];
yading@10:                     j = (pos + t) & 7;
yading@10:                 }
yading@10:                 if (type != AV_SAMPLE_FMT_S16) {
yading@10:                     L2 = L + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
yading@10:                     R2 = R + ((s->decorr[i].weightB * (int64_t)B + 512) >> 10);
yading@10:                 } else {
yading@10:                     L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
yading@10:                     R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
yading@10:                 }
yading@10:                 if (A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
yading@10:                 if (B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta;
yading@10:                 s->decorr[i].samplesA[j] = L = L2;
yading@10:                 s->decorr[i].samplesB[j] = R = R2;
yading@10:             } else if (t == -1) {
yading@10:                 if (type != AV_SAMPLE_FMT_S16)
yading@10:                     L2 = L + ((s->decorr[i].weightA * (int64_t)s->decorr[i].samplesA[0] + 512) >> 10);
yading@10:                 else
yading@10:                     L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10);
yading@10:                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L);
yading@10:                 L = L2;
yading@10:                 if (type != AV_SAMPLE_FMT_S16)
yading@10:                     R2 = R + ((s->decorr[i].weightB * (int64_t)L2 + 512) >> 10);
yading@10:                 else
yading@10:                     R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10);
yading@10:                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R);
yading@10:                 R = R2;
yading@10:                 s->decorr[i].samplesA[0] = R;
yading@10:             } else {
yading@10:                 if (type != AV_SAMPLE_FMT_S16)
yading@10:                     R2 = R + ((s->decorr[i].weightB * (int64_t)s->decorr[i].samplesB[0] + 512) >> 10);
yading@10:                 else
yading@10:                     R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10);
yading@10:                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R);
yading@10:                 R = R2;
yading@10: 
yading@10:                 if (t == -3) {
yading@10:                     R2 = s->decorr[i].samplesA[0];
yading@10:                     s->decorr[i].samplesA[0] = R;
yading@10:                 }
yading@10: 
yading@10:                 if (type != AV_SAMPLE_FMT_S16)
yading@10:                     L2 = L + ((s->decorr[i].weightA * (int64_t)R2 + 512) >> 10);
yading@10:                 else
yading@10:                     L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10);
yading@10:                 UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L);
yading@10:                 L = L2;
yading@10:                 s->decorr[i].samplesB[0] = L;
yading@10:             }
yading@10:         }
yading@10:         pos = (pos + 1) & 7;
yading@10:         if (s->joint)
yading@10:             L += (R -= (L >> 1));
yading@10:         crc = (crc * 3 + L) * 3 + R;
yading@10: 
yading@10:         if (type == AV_SAMPLE_FMT_FLT) {
yading@10:             *dstfl++ = wv_get_value_float(s, &crc_extra_bits, L);
yading@10:             *dstfl++ = wv_get_value_float(s, &crc_extra_bits, R);
yading@10:             dstfl += channel_pad;
yading@10:         } else if (type == AV_SAMPLE_FMT_S32) {
yading@10:             *dst32++ = wv_get_value_integer(s, &crc_extra_bits, L);
yading@10:             *dst32++ = wv_get_value_integer(s, &crc_extra_bits, R);
yading@10:             dst32 += channel_pad;
yading@10:         } else {
yading@10:             *dst16++ = wv_get_value_integer(s, &crc_extra_bits, L);
yading@10:             *dst16++ = wv_get_value_integer(s, &crc_extra_bits, R);
yading@10:             dst16 += channel_pad;
yading@10:         }
yading@10:         count++;
yading@10:     } while (!last && count < s->samples);
yading@10: 
yading@10:     wv_reset_saved_context(s);
yading@10:     if ((s->avctx->err_recognition & AV_EF_CRCCHECK) &&
yading@10:         wv_check_crc(s, crc, crc_extra_bits))
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     return count * 2;
yading@10: }
yading@10: 
yading@10: static inline int wv_unpack_mono(WavpackFrameContext *s, GetBitContext *gb,
yading@10:                                  void *dst, const int type)
yading@10: {
yading@10:     int i, j, count = 0;
yading@10:     int last, t;
yading@10:     int A, S, T;
yading@10:     int pos = s->pos;
yading@10:     uint32_t crc = s->sc.crc;
yading@10:     uint32_t crc_extra_bits = s->extra_sc.crc;
yading@10:     int16_t *dst16 = dst;
yading@10:     int32_t *dst32 = dst;
yading@10:     float   *dstfl = dst;
yading@10:     const int channel_stride = s->avctx->channels;
yading@10: 
yading@10:     s->one = s->zero = s->zeroes = 0;
yading@10:     do {
yading@10:         T = wv_get_value(s, gb, 0, &last);
yading@10:         S = 0;
yading@10:         if (last)
yading@10:             break;
yading@10:         for (i = 0; i < s->terms; i++) {
yading@10:             t = s->decorr[i].value;
yading@10:             if (t > 8) {
yading@10:                 if (t & 1)
yading@10:                     A =  2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
yading@10:                 else
yading@10:                     A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
yading@10:                 s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
yading@10:                 j = 0;
yading@10:             } else {
yading@10:                 A = s->decorr[i].samplesA[pos];
yading@10:                 j = (pos + t) & 7;
yading@10:             }
yading@10:             if (type != AV_SAMPLE_FMT_S16)
yading@10:                 S = T + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
yading@10:             else
yading@10:                 S = T + ((s->decorr[i].weightA * A + 512) >> 10);
yading@10:             if (A && T)
yading@10:                 s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;
yading@10:             s->decorr[i].samplesA[j] = T = S;
yading@10:         }
yading@10:         pos = (pos + 1) & 7;
yading@10:         crc = crc * 3 + S;
yading@10: 
yading@10:         if (type == AV_SAMPLE_FMT_FLT) {
yading@10:             *dstfl = wv_get_value_float(s, &crc_extra_bits, S);
yading@10:             dstfl += channel_stride;
yading@10:         } else if (type == AV_SAMPLE_FMT_S32) {
yading@10:             *dst32 = wv_get_value_integer(s, &crc_extra_bits, S);
yading@10:             dst32 += channel_stride;
yading@10:         } else {
yading@10:             *dst16 = wv_get_value_integer(s, &crc_extra_bits, S);
yading@10:             dst16 += channel_stride;
yading@10:         }
yading@10:         count++;
yading@10:     } while (!last && count < s->samples);
yading@10: 
yading@10:     wv_reset_saved_context(s);
yading@10:     if ((s->avctx->err_recognition & AV_EF_CRCCHECK) &&
yading@10:         wv_check_crc(s, crc, crc_extra_bits))
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     return count;
yading@10: }
yading@10: 
yading@10: static av_cold int wv_alloc_frame_context(WavpackContext *c)
yading@10: {
yading@10: 
yading@10:     if (c->fdec_num == WV_MAX_FRAME_DECODERS)
yading@10:         return -1;
yading@10: 
yading@10:     c->fdec[c->fdec_num] = av_mallocz(sizeof(**c->fdec));
yading@10:     if (!c->fdec[c->fdec_num])
yading@10:         return -1;
yading@10:     c->fdec_num++;
yading@10:     c->fdec[c->fdec_num - 1]->avctx = c->avctx;
yading@10:     wv_reset_saved_context(c->fdec[c->fdec_num - 1]);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int wavpack_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     WavpackContext *s = avctx->priv_data;
yading@10: 
yading@10:     s->avctx = avctx;
yading@10:     if (avctx->bits_per_coded_sample <= 16)
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_S16;
yading@10:     else
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_S32;
yading@10:     if (avctx->channels <= 2 && !avctx->channel_layout)
yading@10:         avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO :
yading@10:                                                          AV_CH_LAYOUT_MONO;
yading@10: 
yading@10:     s->multichannel = avctx->channels > 2;
yading@10:     /* lavf demuxer does not provide extradata, Matroska stores 0x403
yading@10:        there, use this to detect decoding mode for multichannel */
yading@10:     s->mkv_mode = 0;
yading@10:     if (s->multichannel && avctx->extradata && avctx->extradata_size == 2) {
yading@10:         int ver = AV_RL16(avctx->extradata);
yading@10:         if (ver >= 0x402 && ver <= 0x410)
yading@10:             s->mkv_mode = 1;
yading@10:     }
yading@10: 
yading@10:     s->fdec_num = 0;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int wavpack_decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     WavpackContext *s = avctx->priv_data;
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < s->fdec_num; i++)
yading@10:         av_freep(&s->fdec[i]);
yading@10:     s->fdec_num = 0;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
yading@10:                                 void *data, int *got_frame_ptr,
yading@10:                                 const uint8_t *buf, int buf_size)
yading@10: {
yading@10:     WavpackContext *wc = avctx->priv_data;
yading@10:     WavpackFrameContext *s;
yading@10:     void *samples = data;
yading@10:     int samplecount;
yading@10:     int got_terms   = 0, got_weights = 0, got_samples = 0,
yading@10:         got_entropy = 0, got_bs      = 0, got_float   = 0, got_hybrid = 0;
yading@10:     const uint8_t *orig_buf = buf;
yading@10:     const uint8_t *buf_end  = buf + buf_size;
yading@10:     int i, j, id, size, ssize, weights, t;
yading@10:     int bpp, chan, chmask, orig_bpp;
yading@10: 
yading@10:     if (buf_size == 0) {
yading@10:         *got_frame_ptr = 0;
yading@10:         return 0;
yading@10:     }
yading@10: 
yading@10:     if (block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n");
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     s = wc->fdec[block_no];
yading@10:     if (!s) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Context for block %d is not present\n", block_no);
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     if (wc->ch_offset >= avctx->channels) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "too many channels\n");
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
yading@10:     memset(s->ch, 0, sizeof(s->ch));
yading@10:     s->extra_bits = 0;
yading@10:     s->and = s->or = s->shift = 0;
yading@10:     s->got_extra_bits = 0;
yading@10: 
yading@10:     if (!wc->mkv_mode) {
yading@10:         s->samples = AV_RL32(buf); buf += 4;
yading@10:         if (!s->samples) {
yading@10:             *got_frame_ptr = 0;
yading@10:             return 0;
yading@10:         }
yading@10:         if (s->samples > wc->samples) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "too many samples in block");
yading@10:             return -1;
yading@10:         }
yading@10:     } else {
yading@10:         s->samples = wc->samples;
yading@10:     }
yading@10:     s->frame_flags = AV_RL32(buf); buf += 4;
yading@10:     bpp = av_get_bytes_per_sample(avctx->sample_fmt);
yading@10:     samples = (uint8_t*)samples + bpp * wc->ch_offset;
yading@10:     orig_bpp = ((s->frame_flags & 0x03) + 1) << 3;
yading@10: 
yading@10:     s->stereo         = !(s->frame_flags & WV_MONO);
yading@10:     s->stereo_in      =  (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
yading@10:     s->joint          =   s->frame_flags & WV_JOINT_STEREO;
yading@10:     s->hybrid         =   s->frame_flags & WV_HYBRID_MODE;
yading@10:     s->hybrid_bitrate =   s->frame_flags & WV_HYBRID_BITRATE;
yading@10:     s->post_shift     = bpp * 8 - orig_bpp + ((s->frame_flags >> 13) & 0x1f);
yading@10:     s->hybrid_maxclip = (( 1LL << (orig_bpp - 1)) - 1);
yading@10:     s->hybrid_minclip = ((-1LL << (orig_bpp - 1)));
yading@10:     s->CRC            = AV_RL32(buf); buf += 4;
yading@10:     if (wc->mkv_mode)
yading@10:         buf += 4; //skip block size;
yading@10: 
yading@10:     wc->ch_offset += 1 + s->stereo;
yading@10: 
yading@10:     // parse metadata blocks
yading@10:     while (buf < buf_end) {
yading@10:         id   = *buf++;
yading@10:         size = *buf++;
yading@10:         if (id & WP_IDF_LONG) {
yading@10:             size |= (*buf++) << 8;
yading@10:             size |= (*buf++) << 16;
yading@10:         }
yading@10:         size <<= 1; // size is specified in words
yading@10:         ssize = size;
yading@10:         if (id & WP_IDF_ODD)
yading@10:             size--;
yading@10:         if (size < 0) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Got incorrect block %02X with size %i\n", id, size);
yading@10:             break;
yading@10:         }
yading@10:         if (buf + ssize > buf_end) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Block size %i is out of bounds\n", size);
yading@10:             break;
yading@10:         }
yading@10:         if (id & WP_IDF_IGNORE) {
yading@10:             buf += ssize;
yading@10:             continue;
yading@10:         }
yading@10:         switch (id & WP_IDF_MASK) {
yading@10:         case WP_ID_DECTERMS:
yading@10:             if (size > MAX_TERMS) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n");
yading@10:                 s->terms = 0;
yading@10:                 buf += ssize;
yading@10:                 continue;
yading@10:             }
yading@10:             s->terms = size;
yading@10:             for (i = 0; i < s->terms; i++) {
yading@10:                 s->decorr[s->terms - i - 1].value = (*buf & 0x1F) - 5;
yading@10:                 s->decorr[s->terms - i - 1].delta = *buf >> 5;
yading@10:                 buf++;
yading@10:             }
yading@10:             got_terms = 1;
yading@10:             break;
yading@10:         case WP_ID_DECWEIGHTS:
yading@10:             if (!got_terms) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
yading@10:                 continue;
yading@10:             }
yading@10:             weights = size >> s->stereo_in;
yading@10:             if (weights > MAX_TERMS || weights > s->terms) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n");
yading@10:                 buf += ssize;
yading@10:                 continue;
yading@10:             }
yading@10:             for (i = 0; i < weights; i++) {
yading@10:                 t = (int8_t)(*buf++);
yading@10:                 s->decorr[s->terms - i - 1].weightA = t << 3;
yading@10:                 if (s->decorr[s->terms - i - 1].weightA > 0)
yading@10:                     s->decorr[s->terms - i - 1].weightA +=
yading@10:                             (s->decorr[s->terms - i - 1].weightA + 64) >> 7;
yading@10:                 if (s->stereo_in) {
yading@10:                     t = (int8_t)(*buf++);
yading@10:                     s->decorr[s->terms - i - 1].weightB = t << 3;
yading@10:                     if (s->decorr[s->terms - i - 1].weightB > 0)
yading@10:                         s->decorr[s->terms - i - 1].weightB +=
yading@10:                                 (s->decorr[s->terms - i - 1].weightB + 64) >> 7;
yading@10:                 }
yading@10:             }
yading@10:             got_weights = 1;
yading@10:             break;
yading@10:         case WP_ID_DECSAMPLES:
yading@10:             if (!got_terms) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n");
yading@10:                 continue;
yading@10:             }
yading@10:             t = 0;
yading@10:             for (i = s->terms - 1; (i >= 0) && (t < size) && buf <= buf_end; i--) {
yading@10:                 if (s->decorr[i].value > 8) {
yading@10:                     s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;
yading@10:                     s->decorr[i].samplesA[1] = wp_exp2(AV_RL16(buf)); buf += 2;
yading@10:                     if (s->stereo_in) {
yading@10:                         s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;
yading@10:                         s->decorr[i].samplesB[1] = wp_exp2(AV_RL16(buf)); buf += 2;
yading@10:                         t += 4;
yading@10:                     }
yading@10:                     t += 4;
yading@10:                 } else if (s->decorr[i].value < 0) {
yading@10:                     s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2;
yading@10:                     s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2;
yading@10:                     t += 4;
yading@10:                 } else {
yading@10:                     for (j = 0; j < s->decorr[i].value && buf+1<buf_end; j++) {
yading@10:                         s->decorr[i].samplesA[j] = wp_exp2(AV_RL16(buf)); buf += 2;
yading@10:                         if (s->stereo_in) {
yading@10:                             s->decorr[i].samplesB[j] = wp_exp2(AV_RL16(buf)); buf += 2;
yading@10:                         }
yading@10:                     }
yading@10:                     t += s->decorr[i].value * 2 * (s->stereo_in + 1);
yading@10:                 }
yading@10:             }
yading@10:             got_samples = 1;
yading@10:             break;
yading@10:         case WP_ID_ENTROPY:
yading@10:             if (size != 6 * (s->stereo_in + 1)) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, "
yading@10:                        "got %i", 6 * (s->stereo_in + 1), size);
yading@10:                 buf += ssize;
yading@10:                 continue;
yading@10:             }
yading@10:             for (j = 0; j <= s->stereo_in; j++) {
yading@10:                 for (i = 0; i < 3; i++) {
yading@10:                     s->ch[j].median[i] = wp_exp2(AV_RL16(buf));
yading@10:                     buf += 2;
yading@10:                 }
yading@10:             }
yading@10:             got_entropy = 1;
yading@10:             break;
yading@10:         case WP_ID_HYBRID:
yading@10:             if (s->hybrid_bitrate) {
yading@10:                 for (i = 0; i <= s->stereo_in; i++) {
yading@10:                     s->ch[i].slow_level = wp_exp2(AV_RL16(buf));
yading@10:                     buf += 2;
yading@10:                     size -= 2;
yading@10:                 }
yading@10:             }
yading@10:             for (i = 0; i < (s->stereo_in + 1); i++) {
yading@10:                 s->ch[i].bitrate_acc = AV_RL16(buf) << 16;
yading@10:                 buf += 2;
yading@10:                 size -= 2;
yading@10:             }
yading@10:             if (size > 0) {
yading@10:                 for (i = 0; i < (s->stereo_in + 1); i++) {
yading@10:                     s->ch[i].bitrate_delta = wp_exp2((int16_t)AV_RL16(buf));
yading@10:                     buf += 2;
yading@10:                 }
yading@10:             } else {
yading@10:                 for (i = 0; i < (s->stereo_in + 1); i++)
yading@10:                     s->ch[i].bitrate_delta = 0;
yading@10:             }
yading@10:             got_hybrid = 1;
yading@10:             break;
yading@10:         case WP_ID_INT32INFO:
yading@10:             if (size != 4) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Invalid INT32INFO, size = %i, sent_bits = %i\n", size, *buf);
yading@10:                 buf += ssize;
yading@10:                 continue;
yading@10:             }
yading@10:             if (buf[0])
yading@10:                 s->extra_bits = buf[0];
yading@10:             else if (buf[1])
yading@10:                 s->shift = buf[1];
yading@10:             else if (buf[2]){
yading@10:                 s->and = s->or = 1;
yading@10:                 s->shift = buf[2];
yading@10:             } else if(buf[3]) {
yading@10:                 s->and   = 1;
yading@10:                 s->shift = buf[3];
yading@10:             }
yading@10:             /* original WavPack decoder forces 32-bit lossy sound to be treated
yading@10:              * as 24-bit one in order to have proper clipping
yading@10:              */
yading@10:             if (s->hybrid && bpp == 4 && s->post_shift < 8 && s->shift > 8) {
yading@10:                 s->post_shift += 8;
yading@10:                 s->shift      -= 8;
yading@10:                 s->hybrid_maxclip >>= 8;
yading@10:                 s->hybrid_minclip >>= 8;
yading@10:             }
yading@10:             buf += 4;
yading@10:             break;
yading@10:         case WP_ID_FLOATINFO:
yading@10:             if (size != 4) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Invalid FLOATINFO, size = %i\n", size);
yading@10:                 buf += ssize;
yading@10:                 continue;
yading@10:             }
yading@10:             s->float_flag    = buf[0];
yading@10:             s->float_shift   = buf[1];
yading@10:             s->float_max_exp = buf[2];
yading@10:             buf += 4;
yading@10:             got_float = 1;
yading@10:             break;
yading@10:         case WP_ID_DATA:
yading@10:             s->sc.offset = buf - orig_buf;
yading@10:             s->sc.size   = size * 8;
yading@10:             init_get_bits(&s->gb, buf, size * 8);
yading@10:             s->data_size = size * 8;
yading@10:             buf += size;
yading@10:             got_bs = 1;
yading@10:             break;
yading@10:         case WP_ID_EXTRABITS:
yading@10:             if (size <= 4) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n",
yading@10:                        size);
yading@10:                 buf += size;
yading@10:                 continue;
yading@10:             }
yading@10:             s->extra_sc.offset = buf - orig_buf;
yading@10:             s->extra_sc.size   = size * 8;
yading@10:             init_get_bits(&s->gb_extra_bits, buf, size * 8);
yading@10:             s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32);
yading@10:             buf += size;
yading@10:             s->got_extra_bits = 1;
yading@10:             break;
yading@10:         case WP_ID_CHANINFO:
yading@10:             if (size <= 1) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Insufficient channel information\n");
yading@10:                 return -1;
yading@10:             }
yading@10:             chan = *buf++;
yading@10:             switch (size - 2) {
yading@10:             case 0: chmask = *buf;         break;
yading@10:             case 1: chmask = AV_RL16(buf); break;
yading@10:             case 2: chmask = AV_RL24(buf); break;
yading@10:             case 3: chmask = AV_RL32(buf); break;
yading@10:             case 5:
yading@10:                 chan |= (buf[1] & 0xF) << 8;
yading@10:                 chmask = AV_RL24(buf + 2);
yading@10:                 break;
yading@10:             default:
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n",
yading@10:                        size);
yading@10:                 chan   = avctx->channels;
yading@10:                 chmask = avctx->channel_layout;
yading@10:             }
yading@10:             if (chan != avctx->channels) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Block reports total %d channels, "
yading@10:                        "decoder believes it's %d channels\n", chan,
yading@10:                        avctx->channels);
yading@10:                 return -1;
yading@10:             }
yading@10:             if (!avctx->channel_layout)
yading@10:                 avctx->channel_layout = chmask;
yading@10:             buf += size - 1;
yading@10:             break;
yading@10:         default:
yading@10:             buf += size;
yading@10:         }
yading@10:         if (id & WP_IDF_ODD)
yading@10:             buf++;
yading@10:     }
yading@10: 
yading@10:     if (!got_terms) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n");
yading@10:         return -1;
yading@10:     }
yading@10:     if (!got_weights) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n");
yading@10:         return -1;
yading@10:     }
yading@10:     if (!got_samples) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n");
yading@10:         return -1;
yading@10:     }
yading@10:     if (!got_entropy) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n");
yading@10:         return -1;
yading@10:     }
yading@10:     if (s->hybrid && !got_hybrid) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n");
yading@10:         return -1;
yading@10:     }
yading@10:     if (!got_bs) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n");
yading@10:         return -1;
yading@10:     }
yading@10:     if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLT) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Float information not found\n");
yading@10:         return -1;
yading@10:     }
yading@10:     if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLT) {
yading@10:         const int size   = get_bits_left(&s->gb_extra_bits);
yading@10:         const int wanted = s->samples * s->extra_bits << s->stereo_in;
yading@10:         if (size < wanted) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");
yading@10:             s->got_extra_bits = 0;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (s->stereo_in) {
yading@10:         if (avctx->sample_fmt == AV_SAMPLE_FMT_S16)
yading@10:             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S16);
yading@10:         else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)
yading@10:             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S32);
yading@10:         else
yading@10:             samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);
yading@10: 
yading@10:         if (samplecount < 0)
yading@10:             return -1;
yading@10: 
yading@10:         samplecount >>= 1;
yading@10:     } else {
yading@10:         const int channel_stride = avctx->channels;
yading@10: 
yading@10:         if (avctx->sample_fmt == AV_SAMPLE_FMT_S16)
yading@10:             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S16);
yading@10:         else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32)
yading@10:             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S32);
yading@10:         else
yading@10:             samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_FLT);
yading@10: 
yading@10:         if (samplecount < 0)
yading@10:             return -1;
yading@10: 
yading@10:         if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S16) {
yading@10:             int16_t *dst = (int16_t*)samples + 1;
yading@10:             int16_t *src = (int16_t*)samples;
yading@10:             int cnt = samplecount;
yading@10:             while (cnt--) {
yading@10:                 *dst = *src;
yading@10:                 src += channel_stride;
yading@10:                 dst += channel_stride;
yading@10:             }
yading@10:         } else if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S32) {
yading@10:             int32_t *dst = (int32_t*)samples + 1;
yading@10:             int32_t *src = (int32_t*)samples;
yading@10:             int cnt = samplecount;
yading@10:             while (cnt--) {
yading@10:                 *dst = *src;
yading@10:                 src += channel_stride;
yading@10:                 dst += channel_stride;
yading@10:             }
yading@10:         } else if (s->stereo) {
yading@10:             float *dst = (float*)samples + 1;
yading@10:             float *src = (float*)samples;
yading@10:             int cnt = samplecount;
yading@10:             while (cnt--) {
yading@10:                 *dst = *src;
yading@10:                 src += channel_stride;
yading@10:                 dst += channel_stride;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     *got_frame_ptr = 1;
yading@10: 
yading@10:     return samplecount * bpp;
yading@10: }
yading@10: 
yading@10: static void wavpack_decode_flush(AVCodecContext *avctx)
yading@10: {
yading@10:     WavpackContext *s = avctx->priv_data;
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < s->fdec_num; i++)
yading@10:         wv_reset_saved_context(s->fdec[i]);
yading@10: }
yading@10: 
yading@10: static int wavpack_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                                 int *got_frame_ptr, AVPacket *avpkt)
yading@10: {
yading@10:     WavpackContext *s  = avctx->priv_data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size       = avpkt->size;
yading@10:     AVFrame *frame     = data;
yading@10:     int frame_size, ret, frame_flags;
yading@10:     int samplecount = 0;
yading@10: 
yading@10:     s->block     = 0;
yading@10:     s->ch_offset = 0;
yading@10: 
yading@10:     /* determine number of samples */
yading@10:     if (s->mkv_mode) {
yading@10:         s->samples  = AV_RL32(buf); buf += 4;
yading@10:         frame_flags = AV_RL32(buf);
yading@10:     } else {
yading@10:         if (s->multichannel) {
yading@10:             s->samples  = AV_RL32(buf + 4);
yading@10:             frame_flags = AV_RL32(buf + 8);
yading@10:         } else {
yading@10:             s->samples  = AV_RL32(buf);
yading@10:             frame_flags = AV_RL32(buf + 4);
yading@10:         }
yading@10:     }
yading@10:     if (s->samples <= 0 || s->samples > WV_MAX_SAMPLES) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n",
yading@10:                s->samples);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if (frame_flags & 0x80) {
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
yading@10:     } else if ((frame_flags & 0x03) <= 1) {
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_S16;
yading@10:     } else {
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_S32;
yading@10:         avctx->bits_per_raw_sample = ((frame_flags & 0x03) + 1) << 3;
yading@10:     }
yading@10: 
yading@10:     /* get output buffer */
yading@10:     frame->nb_samples = s->samples + 1;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10:     frame->nb_samples = s->samples;
yading@10: 
yading@10:     while (buf_size > 0) {
yading@10:         if (!s->multichannel) {
yading@10:             frame_size = buf_size;
yading@10:         } else {
yading@10:             if (!s->mkv_mode) {
yading@10:                 frame_size = AV_RL32(buf) - 12; buf += 4; buf_size -= 4;
yading@10:             } else {
yading@10:                 if (buf_size < 12) //MKV files can have zero flags after last block
yading@10:                     break;
yading@10:                 frame_size = AV_RL32(buf + 8) + 12;
yading@10:             }
yading@10:         }
yading@10:         if (frame_size < 0 || frame_size > buf_size) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Block %d has invalid size (size %d "
yading@10:                    "vs. %d bytes left)\n", s->block, frame_size, buf_size);
yading@10:             wavpack_decode_flush(avctx);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         if ((samplecount = wavpack_decode_block(avctx, s->block,
yading@10:                                                 frame->data[0], got_frame_ptr,
yading@10:                                                 buf, frame_size)) < 0) {
yading@10:             wavpack_decode_flush(avctx);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         s->block++;
yading@10:         buf += frame_size; buf_size -= frame_size;
yading@10:     }
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_wavpack_decoder = {
yading@10:     .name           = "wavpack",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_WAVPACK,
yading@10:     .priv_data_size = sizeof(WavpackContext),
yading@10:     .init           = wavpack_decode_init,
yading@10:     .close          = wavpack_decode_end,
yading@10:     .decode         = wavpack_decode_frame,
yading@10:     .flush          = wavpack_decode_flush,
yading@10:     .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("WavPack"),
yading@10: };