diff options
Diffstat (limited to 'ffmpeg1/libavcodec/wavpack.c')
| -rw-r--r-- | ffmpeg1/libavcodec/wavpack.c | 1265 |
1 files changed, 1265 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/wavpack.c b/ffmpeg1/libavcodec/wavpack.c new file mode 100644 index 0000000..b30b414 --- /dev/null +++ b/ffmpeg1/libavcodec/wavpack.c @@ -0,0 +1,1265 @@ +/* + * WavPack lossless audio decoder + * Copyright (c) 2006,2011 Konstantin Shishkov + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#define BITSTREAM_READER_LE + +#include "libavutil/channel_layout.h" +#include "avcodec.h" +#include "get_bits.h" +#include "internal.h" +#include "unary.h" + +/** + * @file + * WavPack lossless audio decoder + */ + +#define WV_MONO 0x00000004 +#define WV_JOINT_STEREO 0x00000010 +#define WV_FALSE_STEREO 0x40000000 + +#define WV_HYBRID_MODE 0x00000008 +#define WV_HYBRID_SHAPE 0x00000008 +#define WV_HYBRID_BITRATE 0x00000200 +#define WV_HYBRID_BALANCE 0x00000400 + +#define WV_FLT_SHIFT_ONES 0x01 +#define WV_FLT_SHIFT_SAME 0x02 +#define WV_FLT_SHIFT_SENT 0x04 +#define WV_FLT_ZERO_SENT 0x08 +#define WV_FLT_ZERO_SIGN 0x10 + +#define WV_MAX_SAMPLES 131072 + +enum WP_ID_Flags { + WP_IDF_MASK = 0x1F, + WP_IDF_IGNORE = 0x20, + WP_IDF_ODD = 0x40, + WP_IDF_LONG = 0x80 +}; + +enum WP_ID { + WP_ID_DUMMY = 0, + WP_ID_ENCINFO, + WP_ID_DECTERMS, + WP_ID_DECWEIGHTS, + WP_ID_DECSAMPLES, + WP_ID_ENTROPY, + WP_ID_HYBRID, + WP_ID_SHAPING, + WP_ID_FLOATINFO, + WP_ID_INT32INFO, + WP_ID_DATA, + WP_ID_CORR, + WP_ID_EXTRABITS, + WP_ID_CHANINFO +}; + +typedef struct SavedContext { + int offset; + int size; + int bits_used; + uint32_t crc; +} SavedContext; + +#define MAX_TERMS 16 + +typedef struct Decorr { + int delta; + int value; + int weightA; + int weightB; + int samplesA[8]; + int samplesB[8]; +} Decorr; + +typedef struct WvChannel { + int median[3]; + int slow_level, error_limit; + int bitrate_acc, bitrate_delta; +} WvChannel; + +typedef struct WavpackFrameContext { + AVCodecContext *avctx; + int frame_flags; + int stereo, stereo_in; + int joint; + uint32_t CRC; + GetBitContext gb; + int got_extra_bits; + uint32_t crc_extra_bits; + GetBitContext gb_extra_bits; + int data_size; // in bits + int samples; + int terms; + Decorr decorr[MAX_TERMS]; + int zero, one, zeroes; + int extra_bits; + int and, or, shift; + int post_shift; + int hybrid, hybrid_bitrate; + int hybrid_maxclip, hybrid_minclip; + int float_flag; + int float_shift; + int float_max_exp; + WvChannel ch[2]; + int pos; + SavedContext sc, extra_sc; +} WavpackFrameContext; + +#define WV_MAX_FRAME_DECODERS 14 + +typedef struct WavpackContext { + AVCodecContext *avctx; + + WavpackFrameContext *fdec[WV_MAX_FRAME_DECODERS]; + int fdec_num; + + int multichannel; + int mkv_mode; + int block; + int samples; + int ch_offset; +} WavpackContext; + +// exponent table copied from WavPack source +static const uint8_t wp_exp2_table [256] = { + 0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x08, 0x09, 0x0a, 0x0b, + 0x0b, 0x0c, 0x0d, 0x0e, 0x0e, 0x0f, 0x10, 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x15, 0x16, 0x16, + 0x17, 0x18, 0x19, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1d, 0x1e, 0x1f, 0x20, 0x20, 0x21, 0x22, 0x23, + 0x24, 0x24, 0x25, 0x26, 0x27, 0x28, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3a, 0x3b, 0x3c, 0x3d, + 0x3e, 0x3f, 0x40, 0x41, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x48, 0x49, 0x4a, 0x4b, + 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, + 0x5b, 0x5c, 0x5d, 0x5e, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, + 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, + 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x87, 0x88, 0x89, 0x8a, + 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, + 0x9c, 0x9d, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, + 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, + 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc8, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf, 0xd0, 0xd2, 0xd3, 0xd4, + 0xd6, 0xd7, 0xd8, 0xd9, 0xdb, 0xdc, 0xdd, 0xde, 0xe0, 0xe1, 0xe2, 0xe4, 0xe5, 0xe6, 0xe8, 0xe9, + 0xea, 0xec, 0xed, 0xee, 0xf0, 0xf1, 0xf2, 0xf4, 0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfc, 0xfd, 0xff +}; + +static const uint8_t wp_log2_table [] = { + 0x00, 0x01, 0x03, 0x04, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0d, 0x0e, 0x10, 0x11, 0x12, 0x14, 0x15, + 0x16, 0x18, 0x19, 0x1a, 0x1c, 0x1d, 0x1e, 0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2a, + 0x2c, 0x2d, 0x2e, 0x2f, 0x31, 0x32, 0x33, 0x34, 0x36, 0x37, 0x38, 0x39, 0x3b, 0x3c, 0x3d, 0x3e, + 0x3f, 0x41, 0x42, 0x43, 0x44, 0x45, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4d, 0x4e, 0x4f, 0x50, 0x51, + 0x52, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, + 0x64, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x74, 0x75, + 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, + 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, + 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, + 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb2, + 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0, + 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcb, 0xcc, 0xcd, 0xce, + 0xcf, 0xd0, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd8, 0xd9, 0xda, 0xdb, + 0xdc, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe4, 0xe5, 0xe6, 0xe7, 0xe7, + 0xe8, 0xe9, 0xea, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xee, 0xef, 0xf0, 0xf1, 0xf1, 0xf2, 0xf3, 0xf4, + 0xf4, 0xf5, 0xf6, 0xf7, 0xf7, 0xf8, 0xf9, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xff, 0xff +}; + +static av_always_inline int wp_exp2(int16_t val) +{ + int res, neg = 0; + + if (val < 0) { + val = -val; + neg = 1; + } + + res = wp_exp2_table[val & 0xFF] | 0x100; + val >>= 8; + res = (val > 9) ? (res << (val - 9)) : (res >> (9 - val)); + return neg ? -res : res; +} + +static av_always_inline int wp_log2(int32_t val) +{ + int bits; + + if (!val) + return 0; + if (val == 1) + return 256; + val += val >> 9; + bits = av_log2(val) + 1; + if (bits < 9) + return (bits << 8) + wp_log2_table[(val << (9 - bits)) & 0xFF]; + else + return (bits << 8) + wp_log2_table[(val >> (bits - 9)) & 0xFF]; +} + +#define LEVEL_DECAY(a) ((a + 0x80) >> 8) + +// macros for manipulating median values +#define GET_MED(n) ((c->median[n] >> 4) + 1) +#define DEC_MED(n) c->median[n] -= ((c->median[n] + (128 >> n) - 2) / (128 >> n)) * 2 +#define INC_MED(n) c->median[n] += ((c->median[n] + (128 >> n) ) / (128 >> n)) * 5 + +// macros for applying weight +#define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \ + if (samples && in) { \ + if ((samples ^ in) < 0) { \ + weight -= delta; \ + if (weight < -1024) \ + weight = -1024; \ + } else { \ + weight += delta; \ + if (weight > 1024) \ + weight = 1024; \ + } \ + } + + +static av_always_inline int get_tail(GetBitContext *gb, int k) +{ + int p, e, res; + + if (k < 1) + return 0; + p = av_log2(k); + e = (1 << (p + 1)) - k - 1; + res = p ? get_bits(gb, p) : 0; + if (res >= e) + res = (res << 1) - e + get_bits1(gb); + return res; +} + +static void update_error_limit(WavpackFrameContext *ctx) +{ + int i, br[2], sl[2]; + + for (i = 0; i <= ctx->stereo_in; i++) { + ctx->ch[i].bitrate_acc += ctx->ch[i].bitrate_delta; + br[i] = ctx->ch[i].bitrate_acc >> 16; + sl[i] = LEVEL_DECAY(ctx->ch[i].slow_level); + } + if (ctx->stereo_in && ctx->hybrid_bitrate) { + int balance = (sl[1] - sl[0] + br[1] + 1) >> 1; + if (balance > br[0]) { + br[1] = br[0] << 1; + br[0] = 0; + } else if (-balance > br[0]) { + br[0] <<= 1; + br[1] = 0; + } else { + br[1] = br[0] + balance; + br[0] = br[0] - balance; + } + } + for (i = 0; i <= ctx->stereo_in; i++) { + if (ctx->hybrid_bitrate) { + if (sl[i] - br[i] > -0x100) + ctx->ch[i].error_limit = wp_exp2(sl[i] - br[i] + 0x100); + else + ctx->ch[i].error_limit = 0; + } else { + ctx->ch[i].error_limit = wp_exp2(br[i]); + } + } +} + +static int wv_get_value(WavpackFrameContext *ctx, GetBitContext *gb, + int channel, int *last) +{ + int t, t2; + int sign, base, add, ret; + WvChannel *c = &ctx->ch[channel]; + + *last = 0; + + if ((ctx->ch[0].median[0] < 2U) && (ctx->ch[1].median[0] < 2U) && + !ctx->zero && !ctx->one) { + if (ctx->zeroes) { + ctx->zeroes--; + if (ctx->zeroes) { + c->slow_level -= LEVEL_DECAY(c->slow_level); + return 0; + } + } else { + t = get_unary_0_33(gb); + if (t >= 2) { + if (get_bits_left(gb) < t - 1) + goto error; + t = get_bits(gb, t - 1) | (1 << (t-1)); + } else { + if (get_bits_left(gb) < 0) + goto error; + } + ctx->zeroes = t; + if (ctx->zeroes) { + memset(ctx->ch[0].median, 0, sizeof(ctx->ch[0].median)); + memset(ctx->ch[1].median, 0, sizeof(ctx->ch[1].median)); + c->slow_level -= LEVEL_DECAY(c->slow_level); + return 0; + } + } + } + + if (ctx->zero) { + t = 0; + ctx->zero = 0; + } else { + t = get_unary_0_33(gb); + if (get_bits_left(gb) < 0) + goto error; + if (t == 16) { + t2 = get_unary_0_33(gb); + if (t2 < 2) { + if (get_bits_left(gb) < 0) + goto error; + t += t2; + } else { + if (get_bits_left(gb) < t2 - 1) + goto error; + t += get_bits(gb, t2 - 1) | (1 << (t2 - 1)); + } + } + + if (ctx->one) { + ctx->one = t & 1; + t = (t >> 1) + 1; + } else { + ctx->one = t & 1; + t >>= 1; + } + ctx->zero = !ctx->one; + } + + if (ctx->hybrid && !channel) + update_error_limit(ctx); + + if (!t) { + base = 0; + add = GET_MED(0) - 1; + DEC_MED(0); + } else if (t == 1) { + base = GET_MED(0); + add = GET_MED(1) - 1; + INC_MED(0); + DEC_MED(1); + } else if (t == 2) { + base = GET_MED(0) + GET_MED(1); + add = GET_MED(2) - 1; + INC_MED(0); + INC_MED(1); + DEC_MED(2); + } else { + base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2); + add = GET_MED(2) - 1; + INC_MED(0); + INC_MED(1); + INC_MED(2); + } + if (!c->error_limit) { + ret = base + get_tail(gb, add); + if (get_bits_left(gb) <= 0) + goto error; + } else { + int mid = (base * 2 + add + 1) >> 1; + while (add > c->error_limit) { + if (get_bits_left(gb) <= 0) + goto error; + if (get_bits1(gb)) { + add -= (mid - base); + base = mid; + } else + add = mid - base - 1; + mid = (base * 2 + add + 1) >> 1; + } + ret = mid; + } + sign = get_bits1(gb); + if (ctx->hybrid_bitrate) + c->slow_level += wp_log2(ret) - LEVEL_DECAY(c->slow_level); + return sign ? ~ret : ret; + +error: + *last = 1; + return 0; +} + +static inline int wv_get_value_integer(WavpackFrameContext *s, uint32_t *crc, + int S) +{ + int bit; + + if (s->extra_bits){ + S <<= s->extra_bits; + + if (s->got_extra_bits && get_bits_left(&s->gb_extra_bits) >= s->extra_bits) { + S |= get_bits(&s->gb_extra_bits, s->extra_bits); + *crc = *crc * 9 + (S & 0xffff) * 3 + ((unsigned)S >> 16); + } + } + + bit = (S & s->and) | s->or; + bit = ((S + bit) << s->shift) - bit; + + if (s->hybrid) + bit = av_clip(bit, s->hybrid_minclip, s->hybrid_maxclip); + + return bit << s->post_shift; +} + +static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S) +{ + union { + float f; + uint32_t u; + } value; + + unsigned int sign; + int exp = s->float_max_exp; + + if (s->got_extra_bits) { + const int max_bits = 1 + 23 + 8 + 1; + const int left_bits = get_bits_left(&s->gb_extra_bits); + + if (left_bits + 8 * FF_INPUT_BUFFER_PADDING_SIZE < max_bits) + return 0.0; + } + + if (S) { + S <<= s->float_shift; + sign = S < 0; + if (sign) + S = -S; + if (S >= 0x1000000) { + if (s->got_extra_bits && get_bits1(&s->gb_extra_bits)) + S = get_bits(&s->gb_extra_bits, 23); + else + S = 0; + exp = 255; + } else if (exp) { + int shift = 23 - av_log2(S); + exp = s->float_max_exp; + if (exp <= shift) + shift = --exp; + exp -= shift; + + if (shift) { + S <<= shift; + if ((s->float_flag & WV_FLT_SHIFT_ONES) || + (s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SAME) && + get_bits1(&s->gb_extra_bits))) { + S |= (1 << shift) - 1; + } else if (s->got_extra_bits && + (s->float_flag & WV_FLT_SHIFT_SENT)) { + S |= get_bits(&s->gb_extra_bits, shift); + } + } + } else { + exp = s->float_max_exp; + } + S &= 0x7fffff; + } else { + sign = 0; + exp = 0; + if (s->got_extra_bits && (s->float_flag & WV_FLT_ZERO_SENT)) { + if (get_bits1(&s->gb_extra_bits)) { + S = get_bits(&s->gb_extra_bits, 23); + if (s->float_max_exp >= 25) + exp = get_bits(&s->gb_extra_bits, 8); + sign = get_bits1(&s->gb_extra_bits); + } else { + if (s->float_flag & WV_FLT_ZERO_SIGN) + sign = get_bits1(&s->gb_extra_bits); + } + } + } + + *crc = *crc * 27 + S * 9 + exp * 3 + sign; + + value.u = (sign << 31) | (exp << 23) | S; + return value.f; +} + +static void wv_reset_saved_context(WavpackFrameContext *s) +{ + s->pos = 0; + s->sc.crc = s->extra_sc.crc = 0xFFFFFFFF; +} + +static inline int wv_check_crc(WavpackFrameContext *s, uint32_t crc, + uint32_t crc_extra_bits) +{ + if (crc != s->CRC) { + av_log(s->avctx, AV_LOG_ERROR, "CRC error\n"); + return AVERROR_INVALIDDATA; + } + if (s->got_extra_bits && crc_extra_bits != s->crc_extra_bits) { + av_log(s->avctx, AV_LOG_ERROR, "Extra bits CRC error\n"); + return AVERROR_INVALIDDATA; + } + + return 0; +} + +static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb, + void *dst, const int type) +{ + int i, j, count = 0; + int last, t; + int A, B, L, L2, R, R2; + int pos = s->pos; + uint32_t crc = s->sc.crc; + uint32_t crc_extra_bits = s->extra_sc.crc; + int16_t *dst16 = dst; + int32_t *dst32 = dst; + float *dstfl = dst; + const int channel_pad = s->avctx->channels - 2; + + s->one = s->zero = s->zeroes = 0; + do { + L = wv_get_value(s, gb, 0, &last); + if (last) + break; + R = wv_get_value(s, gb, 1, &last); + if (last) + break; + for (i = 0; i < s->terms; i++) { + t = s->decorr[i].value; + if (t > 0) { + if (t > 8) { + if (t & 1) { + A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]; + B = 2 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]; + } else { + A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1; + B = (3 * s->decorr[i].samplesB[0] - s->decorr[i].samplesB[1]) >> 1; + } + s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0]; + s->decorr[i].samplesB[1] = s->decorr[i].samplesB[0]; + j = 0; + } else { + A = s->decorr[i].samplesA[pos]; + B = s->decorr[i].samplesB[pos]; + j = (pos + t) & 7; + } + if (type != AV_SAMPLE_FMT_S16) { + L2 = L + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10); + R2 = R + ((s->decorr[i].weightB * (int64_t)B + 512) >> 10); + } else { + L2 = L + ((s->decorr[i].weightA * A + 512) >> 10); + R2 = R + ((s->decorr[i].weightB * B + 512) >> 10); + } + if (A && L) s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta; + if (B && R) s->decorr[i].weightB -= ((((R ^ B) >> 30) & 2) - 1) * s->decorr[i].delta; + s->decorr[i].samplesA[j] = L = L2; + s->decorr[i].samplesB[j] = R = R2; + } else if (t == -1) { + if (type != AV_SAMPLE_FMT_S16) + L2 = L + ((s->decorr[i].weightA * (int64_t)s->decorr[i].samplesA[0] + 512) >> 10); + else + L2 = L + ((s->decorr[i].weightA * s->decorr[i].samplesA[0] + 512) >> 10); + UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, s->decorr[i].samplesA[0], L); + L = L2; + if (type != AV_SAMPLE_FMT_S16) + R2 = R + ((s->decorr[i].weightB * (int64_t)L2 + 512) >> 10); + else + R2 = R + ((s->decorr[i].weightB * L2 + 512) >> 10); + UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, L2, R); + R = R2; + s->decorr[i].samplesA[0] = R; + } else { + if (type != AV_SAMPLE_FMT_S16) + R2 = R + ((s->decorr[i].weightB * (int64_t)s->decorr[i].samplesB[0] + 512) >> 10); + else + R2 = R + ((s->decorr[i].weightB * s->decorr[i].samplesB[0] + 512) >> 10); + UPDATE_WEIGHT_CLIP(s->decorr[i].weightB, s->decorr[i].delta, s->decorr[i].samplesB[0], R); + R = R2; + + if (t == -3) { + R2 = s->decorr[i].samplesA[0]; + s->decorr[i].samplesA[0] = R; + } + + if (type != AV_SAMPLE_FMT_S16) + L2 = L + ((s->decorr[i].weightA * (int64_t)R2 + 512) >> 10); + else + L2 = L + ((s->decorr[i].weightA * R2 + 512) >> 10); + UPDATE_WEIGHT_CLIP(s->decorr[i].weightA, s->decorr[i].delta, R2, L); + L = L2; + s->decorr[i].samplesB[0] = L; + } + } + pos = (pos + 1) & 7; + if (s->joint) + L += (R -= (L >> 1)); + crc = (crc * 3 + L) * 3 + R; + + if (type == AV_SAMPLE_FMT_FLT) { + *dstfl++ = wv_get_value_float(s, &crc_extra_bits, L); + *dstfl++ = wv_get_value_float(s, &crc_extra_bits, R); + dstfl += channel_pad; + } else if (type == AV_SAMPLE_FMT_S32) { + *dst32++ = wv_get_value_integer(s, &crc_extra_bits, L); + *dst32++ = wv_get_value_integer(s, &crc_extra_bits, R); + dst32 += channel_pad; + } else { + *dst16++ = wv_get_value_integer(s, &crc_extra_bits, L); + *dst16++ = wv_get_value_integer(s, &crc_extra_bits, R); + dst16 += channel_pad; + } + count++; + } while (!last && count < s->samples); + + wv_reset_saved_context(s); + if ((s->avctx->err_recognition & AV_EF_CRCCHECK) && + wv_check_crc(s, crc, crc_extra_bits)) + return AVERROR_INVALIDDATA; + + return count * 2; +} + +static inline int wv_unpack_mono(WavpackFrameContext *s, GetBitContext *gb, + void *dst, const int type) +{ + int i, j, count = 0; + int last, t; + int A, S, T; + int pos = s->pos; + uint32_t crc = s->sc.crc; + uint32_t crc_extra_bits = s->extra_sc.crc; + int16_t *dst16 = dst; + int32_t *dst32 = dst; + float *dstfl = dst; + const int channel_stride = s->avctx->channels; + + s->one = s->zero = s->zeroes = 0; + do { + T = wv_get_value(s, gb, 0, &last); + S = 0; + if (last) + break; + for (i = 0; i < s->terms; i++) { + t = s->decorr[i].value; + if (t > 8) { + if (t & 1) + A = 2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]; + else + A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1; + s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0]; + j = 0; + } else { + A = s->decorr[i].samplesA[pos]; + j = (pos + t) & 7; + } + if (type != AV_SAMPLE_FMT_S16) + S = T + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10); + else + S = T + ((s->decorr[i].weightA * A + 512) >> 10); + if (A && T) + s->decorr[i].weightA -= ((((T ^ A) >> 30) & 2) - 1) * s->decorr[i].delta; + s->decorr[i].samplesA[j] = T = S; + } + pos = (pos + 1) & 7; + crc = crc * 3 + S; + + if (type == AV_SAMPLE_FMT_FLT) { + *dstfl = wv_get_value_float(s, &crc_extra_bits, S); + dstfl += channel_stride; + } else if (type == AV_SAMPLE_FMT_S32) { + *dst32 = wv_get_value_integer(s, &crc_extra_bits, S); + dst32 += channel_stride; + } else { + *dst16 = wv_get_value_integer(s, &crc_extra_bits, S); + dst16 += channel_stride; + } + count++; + } while (!last && count < s->samples); + + wv_reset_saved_context(s); + if ((s->avctx->err_recognition & AV_EF_CRCCHECK) && + wv_check_crc(s, crc, crc_extra_bits)) + return AVERROR_INVALIDDATA; + + return count; +} + +static av_cold int wv_alloc_frame_context(WavpackContext *c) +{ + + if (c->fdec_num == WV_MAX_FRAME_DECODERS) + return -1; + + c->fdec[c->fdec_num] = av_mallocz(sizeof(**c->fdec)); + if (!c->fdec[c->fdec_num]) + return -1; + c->fdec_num++; + c->fdec[c->fdec_num - 1]->avctx = c->avctx; + wv_reset_saved_context(c->fdec[c->fdec_num - 1]); + + return 0; +} + +static av_cold int wavpack_decode_init(AVCodecContext *avctx) +{ + WavpackContext *s = avctx->priv_data; + + s->avctx = avctx; + if (avctx->bits_per_coded_sample <= 16) + avctx->sample_fmt = AV_SAMPLE_FMT_S16; + else + avctx->sample_fmt = AV_SAMPLE_FMT_S32; + if (avctx->channels <= 2 && !avctx->channel_layout) + avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO : + AV_CH_LAYOUT_MONO; + + s->multichannel = avctx->channels > 2; + /* lavf demuxer does not provide extradata, Matroska stores 0x403 + there, use this to detect decoding mode for multichannel */ + s->mkv_mode = 0; + if (s->multichannel && avctx->extradata && avctx->extradata_size == 2) { + int ver = AV_RL16(avctx->extradata); + if (ver >= 0x402 && ver <= 0x410) + s->mkv_mode = 1; + } + + s->fdec_num = 0; + + return 0; +} + +static av_cold int wavpack_decode_end(AVCodecContext *avctx) +{ + WavpackContext *s = avctx->priv_data; + int i; + + for (i = 0; i < s->fdec_num; i++) + av_freep(&s->fdec[i]); + s->fdec_num = 0; + + return 0; +} + +static int wavpack_decode_block(AVCodecContext *avctx, int block_no, + void *data, int *got_frame_ptr, + const uint8_t *buf, int buf_size) +{ + WavpackContext *wc = avctx->priv_data; + WavpackFrameContext *s; + void *samples = data; + int samplecount; + int got_terms = 0, got_weights = 0, got_samples = 0, + got_entropy = 0, got_bs = 0, got_float = 0, got_hybrid = 0; + const uint8_t *orig_buf = buf; + const uint8_t *buf_end = buf + buf_size; + int i, j, id, size, ssize, weights, t; + int bpp, chan, chmask, orig_bpp; + + if (buf_size == 0) { + *got_frame_ptr = 0; + return 0; + } + + if (block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0) { + av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n"); + return -1; + } + + s = wc->fdec[block_no]; + if (!s) { + av_log(avctx, AV_LOG_ERROR, "Context for block %d is not present\n", block_no); + return -1; + } + + if (wc->ch_offset >= avctx->channels) { + av_log(avctx, AV_LOG_ERROR, "too many channels\n"); + return -1; + } + + memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr)); + memset(s->ch, 0, sizeof(s->ch)); + s->extra_bits = 0; + s->and = s->or = s->shift = 0; + s->got_extra_bits = 0; + + if (!wc->mkv_mode) { + s->samples = AV_RL32(buf); buf += 4; + if (!s->samples) { + *got_frame_ptr = 0; + return 0; + } + if (s->samples > wc->samples) { + av_log(avctx, AV_LOG_ERROR, "too many samples in block"); + return -1; + } + } else { + s->samples = wc->samples; + } + s->frame_flags = AV_RL32(buf); buf += 4; + bpp = av_get_bytes_per_sample(avctx->sample_fmt); + samples = (uint8_t*)samples + bpp * wc->ch_offset; + orig_bpp = ((s->frame_flags & 0x03) + 1) << 3; + + s->stereo = !(s->frame_flags & WV_MONO); + s->stereo_in = (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo; + s->joint = s->frame_flags & WV_JOINT_STEREO; + s->hybrid = s->frame_flags & WV_HYBRID_MODE; + s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE; + s->post_shift = bpp * 8 - orig_bpp + ((s->frame_flags >> 13) & 0x1f); + s->hybrid_maxclip = (( 1LL << (orig_bpp - 1)) - 1); + s->hybrid_minclip = ((-1LL << (orig_bpp - 1))); + s->CRC = AV_RL32(buf); buf += 4; + if (wc->mkv_mode) + buf += 4; //skip block size; + + wc->ch_offset += 1 + s->stereo; + + // parse metadata blocks + while (buf < buf_end) { + id = *buf++; + size = *buf++; + if (id & WP_IDF_LONG) { + size |= (*buf++) << 8; + size |= (*buf++) << 16; + } + size <<= 1; // size is specified in words + ssize = size; + if (id & WP_IDF_ODD) + size--; + if (size < 0) { + av_log(avctx, AV_LOG_ERROR, "Got incorrect block %02X with size %i\n", id, size); + break; + } + if (buf + ssize > buf_end) { + av_log(avctx, AV_LOG_ERROR, "Block size %i is out of bounds\n", size); + break; + } + if (id & WP_IDF_IGNORE) { + buf += ssize; + continue; + } + switch (id & WP_IDF_MASK) { + case WP_ID_DECTERMS: + if (size > MAX_TERMS) { + av_log(avctx, AV_LOG_ERROR, "Too many decorrelation terms\n"); + s->terms = 0; + buf += ssize; + continue; + } + s->terms = size; + for (i = 0; i < s->terms; i++) { + s->decorr[s->terms - i - 1].value = (*buf & 0x1F) - 5; + s->decorr[s->terms - i - 1].delta = *buf >> 5; + buf++; + } + got_terms = 1; + break; + case WP_ID_DECWEIGHTS: + if (!got_terms) { + av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n"); + continue; + } + weights = size >> s->stereo_in; + if (weights > MAX_TERMS || weights > s->terms) { + av_log(avctx, AV_LOG_ERROR, "Too many decorrelation weights\n"); + buf += ssize; + continue; + } + for (i = 0; i < weights; i++) { + t = (int8_t)(*buf++); + s->decorr[s->terms - i - 1].weightA = t << 3; + if (s->decorr[s->terms - i - 1].weightA > 0) + s->decorr[s->terms - i - 1].weightA += + (s->decorr[s->terms - i - 1].weightA + 64) >> 7; + if (s->stereo_in) { + t = (int8_t)(*buf++); + s->decorr[s->terms - i - 1].weightB = t << 3; + if (s->decorr[s->terms - i - 1].weightB > 0) + s->decorr[s->terms - i - 1].weightB += + (s->decorr[s->terms - i - 1].weightB + 64) >> 7; + } + } + got_weights = 1; + break; + case WP_ID_DECSAMPLES: + if (!got_terms) { + av_log(avctx, AV_LOG_ERROR, "No decorrelation terms met\n"); + continue; + } + t = 0; + for (i = s->terms - 1; (i >= 0) && (t < size) && buf <= buf_end; i--) { + if (s->decorr[i].value > 8) { + s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2; + s->decorr[i].samplesA[1] = wp_exp2(AV_RL16(buf)); buf += 2; + if (s->stereo_in) { + s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2; + s->decorr[i].samplesB[1] = wp_exp2(AV_RL16(buf)); buf += 2; + t += 4; + } + t += 4; + } else if (s->decorr[i].value < 0) { + s->decorr[i].samplesA[0] = wp_exp2(AV_RL16(buf)); buf += 2; + s->decorr[i].samplesB[0] = wp_exp2(AV_RL16(buf)); buf += 2; + t += 4; + } else { + for (j = 0; j < s->decorr[i].value && buf+1<buf_end; j++) { + s->decorr[i].samplesA[j] = wp_exp2(AV_RL16(buf)); buf += 2; + if (s->stereo_in) { + s->decorr[i].samplesB[j] = wp_exp2(AV_RL16(buf)); buf += 2; + } + } + t += s->decorr[i].value * 2 * (s->stereo_in + 1); + } + } + got_samples = 1; + break; + case WP_ID_ENTROPY: + if (size != 6 * (s->stereo_in + 1)) { + av_log(avctx, AV_LOG_ERROR, "Entropy vars size should be %i, " + "got %i", 6 * (s->stereo_in + 1), size); + buf += ssize; + continue; + } + for (j = 0; j <= s->stereo_in; j++) { + for (i = 0; i < 3; i++) { + s->ch[j].median[i] = wp_exp2(AV_RL16(buf)); + buf += 2; + } + } + got_entropy = 1; + break; + case WP_ID_HYBRID: + if (s->hybrid_bitrate) { + for (i = 0; i <= s->stereo_in; i++) { + s->ch[i].slow_level = wp_exp2(AV_RL16(buf)); + buf += 2; + size -= 2; + } + } + for (i = 0; i < (s->stereo_in + 1); i++) { + s->ch[i].bitrate_acc = AV_RL16(buf) << 16; + buf += 2; + size -= 2; + } + if (size > 0) { + for (i = 0; i < (s->stereo_in + 1); i++) { + s->ch[i].bitrate_delta = wp_exp2((int16_t)AV_RL16(buf)); + buf += 2; + } + } else { + for (i = 0; i < (s->stereo_in + 1); i++) + s->ch[i].bitrate_delta = 0; + } + got_hybrid = 1; + break; + case WP_ID_INT32INFO: + if (size != 4) { + av_log(avctx, AV_LOG_ERROR, "Invalid INT32INFO, size = %i, sent_bits = %i\n", size, *buf); + buf += ssize; + continue; + } + if (buf[0]) + s->extra_bits = buf[0]; + else if (buf[1]) + s->shift = buf[1]; + else if (buf[2]){ + s->and = s->or = 1; + s->shift = buf[2]; + } else if(buf[3]) { + s->and = 1; + s->shift = buf[3]; + } + /* original WavPack decoder forces 32-bit lossy sound to be treated + * as 24-bit one in order to have proper clipping + */ + if (s->hybrid && bpp == 4 && s->post_shift < 8 && s->shift > 8) { + s->post_shift += 8; + s->shift -= 8; + s->hybrid_maxclip >>= 8; + s->hybrid_minclip >>= 8; + } + buf += 4; + break; + case WP_ID_FLOATINFO: + if (size != 4) { + av_log(avctx, AV_LOG_ERROR, "Invalid FLOATINFO, size = %i\n", size); + buf += ssize; + continue; + } + s->float_flag = buf[0]; + s->float_shift = buf[1]; + s->float_max_exp = buf[2]; + buf += 4; + got_float = 1; + break; + case WP_ID_DATA: + s->sc.offset = buf - orig_buf; + s->sc.size = size * 8; + init_get_bits(&s->gb, buf, size * 8); + s->data_size = size * 8; + buf += size; + got_bs = 1; + break; + case WP_ID_EXTRABITS: + if (size <= 4) { + av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n", + size); + buf += size; + continue; + } + s->extra_sc.offset = buf - orig_buf; + s->extra_sc.size = size * 8; + init_get_bits(&s->gb_extra_bits, buf, size * 8); + s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32); + buf += size; + s->got_extra_bits = 1; + break; + case WP_ID_CHANINFO: + if (size <= 1) { + av_log(avctx, AV_LOG_ERROR, "Insufficient channel information\n"); + return -1; + } + chan = *buf++; + switch (size - 2) { + case 0: chmask = *buf; break; + case 1: chmask = AV_RL16(buf); break; + case 2: chmask = AV_RL24(buf); break; + case 3: chmask = AV_RL32(buf); break; + case 5: + chan |= (buf[1] & 0xF) << 8; + chmask = AV_RL24(buf + 2); + break; + default: + av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n", + size); + chan = avctx->channels; + chmask = avctx->channel_layout; + } + if (chan != avctx->channels) { + av_log(avctx, AV_LOG_ERROR, "Block reports total %d channels, " + "decoder believes it's %d channels\n", chan, + avctx->channels); + return -1; + } + if (!avctx->channel_layout) + avctx->channel_layout = chmask; + buf += size - 1; + break; + default: + buf += size; + } + if (id & WP_IDF_ODD) + buf++; + } + + if (!got_terms) { + av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n"); + return -1; + } + if (!got_weights) { + av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n"); + return -1; + } + if (!got_samples) { + av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n"); + return -1; + } + if (!got_entropy) { + av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n"); + return -1; + } + if (s->hybrid && !got_hybrid) { + av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n"); + return -1; + } + if (!got_bs) { + av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n"); + return -1; + } + if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLT) { + av_log(avctx, AV_LOG_ERROR, "Float information not found\n"); + return -1; + } + if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLT) { + const int size = get_bits_left(&s->gb_extra_bits); + const int wanted = s->samples * s->extra_bits << s->stereo_in; + if (size < wanted) { + av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n"); + s->got_extra_bits = 0; + } + } + + if (s->stereo_in) { + if (avctx->sample_fmt == AV_SAMPLE_FMT_S16) + samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S16); + else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32) + samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_S32); + else + samplecount = wv_unpack_stereo(s, &s->gb, samples, AV_SAMPLE_FMT_FLT); + + if (samplecount < 0) + return -1; + + samplecount >>= 1; + } else { + const int channel_stride = avctx->channels; + + if (avctx->sample_fmt == AV_SAMPLE_FMT_S16) + samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S16); + else if (avctx->sample_fmt == AV_SAMPLE_FMT_S32) + samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_S32); + else + samplecount = wv_unpack_mono(s, &s->gb, samples, AV_SAMPLE_FMT_FLT); + + if (samplecount < 0) + return -1; + + if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S16) { + int16_t *dst = (int16_t*)samples + 1; + int16_t *src = (int16_t*)samples; + int cnt = samplecount; + while (cnt--) { + *dst = *src; + src += channel_stride; + dst += channel_stride; + } + } else if (s->stereo && avctx->sample_fmt == AV_SAMPLE_FMT_S32) { + int32_t *dst = (int32_t*)samples + 1; + int32_t *src = (int32_t*)samples; + int cnt = samplecount; + while (cnt--) { + *dst = *src; + src += channel_stride; + dst += channel_stride; + } + } else if (s->stereo) { + float *dst = (float*)samples + 1; + float *src = (float*)samples; + int cnt = samplecount; + while (cnt--) { + *dst = *src; + src += channel_stride; + dst += channel_stride; + } + } + } + + *got_frame_ptr = 1; + + return samplecount * bpp; +} + +static void wavpack_decode_flush(AVCodecContext *avctx) +{ + WavpackContext *s = avctx->priv_data; + int i; + + for (i = 0; i < s->fdec_num; i++) + wv_reset_saved_context(s->fdec[i]); +} + +static int wavpack_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame_ptr, AVPacket *avpkt) +{ + WavpackContext *s = avctx->priv_data; + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + AVFrame *frame = data; + int frame_size, ret, frame_flags; + int samplecount = 0; + + s->block = 0; + s->ch_offset = 0; + + /* determine number of samples */ + if (s->mkv_mode) { + s->samples = AV_RL32(buf); buf += 4; + frame_flags = AV_RL32(buf); + } else { + if (s->multichannel) { + s->samples = AV_RL32(buf + 4); + frame_flags = AV_RL32(buf + 8); + } else { + s->samples = AV_RL32(buf); + frame_flags = AV_RL32(buf + 4); + } + } + if (s->samples <= 0 || s->samples > WV_MAX_SAMPLES) { + av_log(avctx, AV_LOG_ERROR, "Invalid number of samples: %d\n", + s->samples); + return AVERROR(EINVAL); + } + + if (frame_flags & 0x80) { + avctx->sample_fmt = AV_SAMPLE_FMT_FLT; + } else if ((frame_flags & 0x03) <= 1) { + avctx->sample_fmt = AV_SAMPLE_FMT_S16; + } else { + avctx->sample_fmt = AV_SAMPLE_FMT_S32; + avctx->bits_per_raw_sample = ((frame_flags & 0x03) + 1) << 3; + } + + /* get output buffer */ + frame->nb_samples = s->samples + 1; + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + frame->nb_samples = s->samples; + + while (buf_size > 0) { + if (!s->multichannel) { + frame_size = buf_size; + } else { + if (!s->mkv_mode) { + frame_size = AV_RL32(buf) - 12; buf += 4; buf_size -= 4; + } else { + if (buf_size < 12) //MKV files can have zero flags after last block + break; + frame_size = AV_RL32(buf + 8) + 12; + } + } + if (frame_size < 0 || frame_size > buf_size) { + av_log(avctx, AV_LOG_ERROR, "Block %d has invalid size (size %d " + "vs. %d bytes left)\n", s->block, frame_size, buf_size); + wavpack_decode_flush(avctx); + return AVERROR_INVALIDDATA; + } + if ((samplecount = wavpack_decode_block(avctx, s->block, + frame->data[0], got_frame_ptr, + buf, frame_size)) < 0) { + wavpack_decode_flush(avctx); + return AVERROR_INVALIDDATA; + } + s->block++; + buf += frame_size; buf_size -= frame_size; + } + + return avpkt->size; +} + +AVCodec ff_wavpack_decoder = { + .name = "wavpack", + .type = AVMEDIA_TYPE_AUDIO, + .id = AV_CODEC_ID_WAVPACK, + .priv_data_size = sizeof(WavpackContext), + .init = wavpack_decode_init, + .close = wavpack_decode_end, + .decode = wavpack_decode_frame, + .flush = wavpack_decode_flush, + .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("WavPack"), +}; |