| /* |
| * 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 "thread.h" |
| #include "unary.h" |
| #include "bytestream.h" |
| #include "wavpack.h" |
| |
| /** |
| * @file |
| * WavPack lossless audio decoder |
| */ |
| |
| typedef struct SavedContext { |
| int offset; |
| int size; |
| int bits_used; |
| uint32_t crc; |
| } SavedContext; |
| |
| 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 block; |
| int samples; |
| int ch_offset; |
| } WavpackContext; |
| |
| #define LEVEL_DECAY(a) (((a) + 0x80) >> 8) |
| |
| 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 = get_bitsz(gb, p); |
| 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_long(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_long(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) { |
| if (add >= 0x2000000U) { |
| av_log(ctx->avctx, AV_LOG_ERROR, "k %d is too large\n", add); |
| goto error; |
| } |
| 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: |
| ret = get_bits_left(gb); |
| if (ret <= 0) { |
| av_log(ctx->avctx, AV_LOG_ERROR, "Too few bits (%d) left\n", ret); |
| } |
| *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_long(&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 * AV_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_l, void *dst_r, 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_l = dst_l; |
| int16_t *dst16_r = dst_r; |
| int32_t *dst32_l = dst_l; |
| int32_t *dst32_r = dst_r; |
| float *dstfl_l = dst_l; |
| float *dstfl_r = dst_r; |
| |
| 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_S16P) { |
| 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_S16P) |
| 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_S16P) |
| 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_S16P) |
| 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_S16P) |
| 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; |
| } |
| } |
| |
| if (type == AV_SAMPLE_FMT_S16P) { |
| if (FFABS(L) + FFABS(R) > (1<<19)) { |
| av_log(s->avctx, AV_LOG_ERROR, "sample %d %d too large\n", L, R); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| |
| pos = (pos + 1) & 7; |
| if (s->joint) |
| L += (R -= (L >> 1)); |
| crc = (crc * 3 + L) * 3 + R; |
| |
| if (type == AV_SAMPLE_FMT_FLTP) { |
| *dstfl_l++ = wv_get_value_float(s, &crc_extra_bits, L); |
| *dstfl_r++ = wv_get_value_float(s, &crc_extra_bits, R); |
| } else if (type == AV_SAMPLE_FMT_S32P) { |
| *dst32_l++ = wv_get_value_integer(s, &crc_extra_bits, L); |
| *dst32_r++ = wv_get_value_integer(s, &crc_extra_bits, R); |
| } else { |
| *dst16_l++ = wv_get_value_integer(s, &crc_extra_bits, L); |
| *dst16_r++ = wv_get_value_integer(s, &crc_extra_bits, R); |
| } |
| count++; |
| } while (!last && count < s->samples); |
| |
| wv_reset_saved_context(s); |
| |
| if (last && count < s->samples) { |
| int size = av_get_bytes_per_sample(type); |
| memset((uint8_t*)dst_l + count*size, 0, (s->samples-count)*size); |
| memset((uint8_t*)dst_r + count*size, 0, (s->samples-count)*size); |
| } |
| |
| if ((s->avctx->err_recognition & AV_EF_CRCCHECK) && |
| wv_check_crc(s, crc, crc_extra_bits)) |
| return AVERROR_INVALIDDATA; |
| |
| return 0; |
| } |
| |
| 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; |
| |
| 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_S16P) |
| 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_FLTP) { |
| *dstfl++ = wv_get_value_float(s, &crc_extra_bits, S); |
| } else if (type == AV_SAMPLE_FMT_S32P) { |
| *dst32++ = wv_get_value_integer(s, &crc_extra_bits, S); |
| } else { |
| *dst16++ = wv_get_value_integer(s, &crc_extra_bits, S); |
| } |
| count++; |
| } while (!last && count < s->samples); |
| |
| wv_reset_saved_context(s); |
| |
| if (last && count < s->samples) { |
| int size = av_get_bytes_per_sample(type); |
| memset((uint8_t*)dst + count*size, 0, (s->samples-count)*size); |
| } |
| |
| if (s->avctx->err_recognition & AV_EF_CRCCHECK) { |
| int ret = wv_check_crc(s, crc, crc_extra_bits); |
| if (ret < 0 && s->avctx->err_recognition & AV_EF_EXPLODE) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| #if HAVE_THREADS |
| static int init_thread_copy(AVCodecContext *avctx) |
| { |
| WavpackContext *s = avctx->priv_data; |
| s->avctx = avctx; |
| return 0; |
| } |
| #endif |
| |
| static av_cold int wavpack_decode_init(AVCodecContext *avctx) |
| { |
| WavpackContext *s = avctx->priv_data; |
| |
| s->avctx = avctx; |
| |
| 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, |
| AVFrame *frame, const uint8_t *buf, int buf_size) |
| { |
| WavpackContext *wc = avctx->priv_data; |
| ThreadFrame tframe = { .f = frame }; |
| WavpackFrameContext *s; |
| GetByteContext gb; |
| void *samples_l = NULL, *samples_r = NULL; |
| int ret; |
| int got_terms = 0, got_weights = 0, got_samples = 0, |
| got_entropy = 0, got_bs = 0, got_float = 0, got_hybrid = 0; |
| int i, j, id, size, ssize, weights, t; |
| int bpp, chan = 0, chmask = 0, orig_bpp, sample_rate = 0; |
| int multiblock; |
| |
| 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 AVERROR_INVALIDDATA; |
| } |
| |
| s = wc->fdec[block_no]; |
| if (!s) { |
| av_log(avctx, AV_LOG_ERROR, "Context for block %d is not present\n", |
| block_no); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| 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; |
| |
| bytestream2_init(&gb, buf, buf_size); |
| |
| s->samples = bytestream2_get_le32(&gb); |
| if (s->samples != wc->samples) { |
| av_log(avctx, AV_LOG_ERROR, "Mismatching number of samples in " |
| "a sequence: %d and %d\n", wc->samples, s->samples); |
| return AVERROR_INVALIDDATA; |
| } |
| s->frame_flags = bytestream2_get_le32(&gb); |
| bpp = av_get_bytes_per_sample(avctx->sample_fmt); |
| orig_bpp = ((s->frame_flags & 0x03) + 1) << 3; |
| multiblock = (s->frame_flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK; |
| |
| 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 = bytestream2_get_le32(&gb); |
| |
| // parse metadata blocks |
| while (bytestream2_get_bytes_left(&gb)) { |
| id = bytestream2_get_byte(&gb); |
| size = bytestream2_get_byte(&gb); |
| if (id & WP_IDF_LONG) { |
| size |= (bytestream2_get_byte(&gb)) << 8; |
| size |= (bytestream2_get_byte(&gb)) << 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 (bytestream2_get_bytes_left(&gb) < ssize) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Block size %i is out of bounds\n", size); |
| break; |
| } |
| 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; |
| bytestream2_skip(&gb, ssize); |
| continue; |
| } |
| s->terms = size; |
| for (i = 0; i < s->terms; i++) { |
| uint8_t val = bytestream2_get_byte(&gb); |
| s->decorr[s->terms - i - 1].value = (val & 0x1F) - 5; |
| s->decorr[s->terms - i - 1].delta = val >> 5; |
| } |
| 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"); |
| bytestream2_skip(&gb, ssize); |
| continue; |
| } |
| for (i = 0; i < weights; i++) { |
| t = (int8_t)bytestream2_get_byte(&gb); |
| 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)bytestream2_get_byte(&gb); |
| 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); i--) { |
| if (s->decorr[i].value > 8) { |
| s->decorr[i].samplesA[0] = |
| wp_exp2(bytestream2_get_le16(&gb)); |
| s->decorr[i].samplesA[1] = |
| wp_exp2(bytestream2_get_le16(&gb)); |
| |
| if (s->stereo_in) { |
| s->decorr[i].samplesB[0] = |
| wp_exp2(bytestream2_get_le16(&gb)); |
| s->decorr[i].samplesB[1] = |
| wp_exp2(bytestream2_get_le16(&gb)); |
| t += 4; |
| } |
| t += 4; |
| } else if (s->decorr[i].value < 0) { |
| s->decorr[i].samplesA[0] = |
| wp_exp2(bytestream2_get_le16(&gb)); |
| s->decorr[i].samplesB[0] = |
| wp_exp2(bytestream2_get_le16(&gb)); |
| t += 4; |
| } else { |
| for (j = 0; j < s->decorr[i].value; j++) { |
| s->decorr[i].samplesA[j] = |
| wp_exp2(bytestream2_get_le16(&gb)); |
| if (s->stereo_in) { |
| s->decorr[i].samplesB[j] = |
| wp_exp2(bytestream2_get_le16(&gb)); |
| } |
| } |
| 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.\n", |
| 6 * (s->stereo_in + 1), size); |
| bytestream2_skip(&gb, ssize); |
| continue; |
| } |
| for (j = 0; j <= s->stereo_in; j++) |
| for (i = 0; i < 3; i++) { |
| s->ch[j].median[i] = wp_exp2(bytestream2_get_le16(&gb)); |
| } |
| 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(bytestream2_get_le16(&gb)); |
| size -= 2; |
| } |
| } |
| for (i = 0; i < (s->stereo_in + 1); i++) { |
| s->ch[i].bitrate_acc = bytestream2_get_le16(&gb) << 16; |
| size -= 2; |
| } |
| if (size > 0) { |
| for (i = 0; i < (s->stereo_in + 1); i++) { |
| s->ch[i].bitrate_delta = |
| wp_exp2((int16_t)bytestream2_get_le16(&gb)); |
| } |
| } else { |
| for (i = 0; i < (s->stereo_in + 1); i++) |
| s->ch[i].bitrate_delta = 0; |
| } |
| got_hybrid = 1; |
| break; |
| case WP_ID_INT32INFO: { |
| uint8_t val[4]; |
| if (size != 4) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid INT32INFO, size = %i\n", |
| size); |
| bytestream2_skip(&gb, ssize - 4); |
| continue; |
| } |
| bytestream2_get_buffer(&gb, val, 4); |
| if (val[0] > 32) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid INT32INFO, extra_bits = %d (> 32)\n", val[0]); |
| continue; |
| } else if (val[0]) { |
| s->extra_bits = val[0]; |
| } else if (val[1]) { |
| s->shift = val[1]; |
| } else if (val[2]) { |
| s->and = s->or = 1; |
| s->shift = val[2]; |
| } else if (val[3]) { |
| s->and = 1; |
| s->shift = val[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; |
| } |
| break; |
| } |
| case WP_ID_FLOATINFO: |
| if (size != 4) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid FLOATINFO, size = %i\n", size); |
| bytestream2_skip(&gb, ssize); |
| continue; |
| } |
| s->float_flag = bytestream2_get_byte(&gb); |
| s->float_shift = bytestream2_get_byte(&gb); |
| s->float_max_exp = bytestream2_get_byte(&gb); |
| got_float = 1; |
| bytestream2_skip(&gb, 1); |
| break; |
| case WP_ID_DATA: |
| s->sc.offset = bytestream2_tell(&gb); |
| s->sc.size = size * 8; |
| if ((ret = init_get_bits8(&s->gb, gb.buffer, size)) < 0) |
| return ret; |
| s->data_size = size * 8; |
| bytestream2_skip(&gb, size); |
| got_bs = 1; |
| break; |
| case WP_ID_EXTRABITS: |
| if (size <= 4) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid EXTRABITS, size = %i\n", |
| size); |
| bytestream2_skip(&gb, size); |
| continue; |
| } |
| s->extra_sc.offset = bytestream2_tell(&gb); |
| s->extra_sc.size = size * 8; |
| if ((ret = init_get_bits8(&s->gb_extra_bits, gb.buffer, size)) < 0) |
| return ret; |
| s->crc_extra_bits = get_bits_long(&s->gb_extra_bits, 32); |
| bytestream2_skip(&gb, 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 AVERROR_INVALIDDATA; |
| } |
| chan = bytestream2_get_byte(&gb); |
| switch (size - 2) { |
| case 0: |
| chmask = bytestream2_get_byte(&gb); |
| break; |
| case 1: |
| chmask = bytestream2_get_le16(&gb); |
| break; |
| case 2: |
| chmask = bytestream2_get_le24(&gb); |
| break; |
| case 3: |
| chmask = bytestream2_get_le32(&gb); |
| break; |
| case 5: |
| size = bytestream2_get_byte(&gb); |
| if (avctx->channels != size) |
| av_log(avctx, AV_LOG_WARNING, "%i channels signalled" |
| " instead of %i.\n", size, avctx->channels); |
| chan |= (bytestream2_get_byte(&gb) & 0xF) << 8; |
| chmask = bytestream2_get_le16(&gb); |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "Invalid channel info size %d\n", |
| size); |
| chan = avctx->channels; |
| chmask = avctx->channel_layout; |
| } |
| break; |
| case WP_ID_SAMPLE_RATE: |
| if (size != 3) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid custom sample rate.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| sample_rate = bytestream2_get_le24(&gb); |
| break; |
| default: |
| bytestream2_skip(&gb, size); |
| } |
| if (id & WP_IDF_ODD) |
| bytestream2_skip(&gb, 1); |
| } |
| |
| if (!got_terms) { |
| av_log(avctx, AV_LOG_ERROR, "No block with decorrelation terms\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (!got_weights) { |
| av_log(avctx, AV_LOG_ERROR, "No block with decorrelation weights\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (!got_samples) { |
| av_log(avctx, AV_LOG_ERROR, "No block with decorrelation samples\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (!got_entropy) { |
| av_log(avctx, AV_LOG_ERROR, "No block with entropy info\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (s->hybrid && !got_hybrid) { |
| av_log(avctx, AV_LOG_ERROR, "Hybrid config not found\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (!got_bs) { |
| av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (!got_float && avctx->sample_fmt == AV_SAMPLE_FMT_FLTP) { |
| av_log(avctx, AV_LOG_ERROR, "Float information not found\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (s->got_extra_bits && avctx->sample_fmt != AV_SAMPLE_FMT_FLTP) { |
| 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 (!wc->ch_offset) { |
| int sr = (s->frame_flags >> 23) & 0xf; |
| if (sr == 0xf) { |
| if (!sample_rate) { |
| av_log(avctx, AV_LOG_ERROR, "Custom sample rate missing.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| avctx->sample_rate = sample_rate; |
| } else |
| avctx->sample_rate = wv_rates[sr]; |
| |
| if (multiblock) { |
| if (chan) |
| avctx->channels = chan; |
| if (chmask) |
| avctx->channel_layout = chmask; |
| } else { |
| avctx->channels = s->stereo ? 2 : 1; |
| avctx->channel_layout = s->stereo ? AV_CH_LAYOUT_STEREO : |
| AV_CH_LAYOUT_MONO; |
| } |
| |
| /* get output buffer */ |
| frame->nb_samples = s->samples + 1; |
| if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0) |
| return ret; |
| frame->nb_samples = s->samples; |
| } |
| |
| if (wc->ch_offset + s->stereo >= avctx->channels) { |
| av_log(avctx, AV_LOG_WARNING, "Too many channels coded in a packet.\n"); |
| return (avctx->err_recognition & AV_EF_EXPLODE) ? AVERROR_INVALIDDATA : 0; |
| } |
| |
| samples_l = frame->extended_data[wc->ch_offset]; |
| if (s->stereo) |
| samples_r = frame->extended_data[wc->ch_offset + 1]; |
| |
| wc->ch_offset += 1 + s->stereo; |
| |
| if (s->stereo_in) { |
| ret = wv_unpack_stereo(s, &s->gb, samples_l, samples_r, avctx->sample_fmt); |
| if (ret < 0) |
| return ret; |
| } else { |
| ret = wv_unpack_mono(s, &s->gb, samples_l, avctx->sample_fmt); |
| if (ret < 0) |
| return ret; |
| |
| if (s->stereo) |
| memcpy(samples_r, samples_l, bpp * s->samples); |
| } |
| |
| return 0; |
| } |
| |
| 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; |
| |
| if (avpkt->size <= WV_HEADER_SIZE) |
| return AVERROR_INVALIDDATA; |
| |
| s->block = 0; |
| s->ch_offset = 0; |
| |
| /* determine number of samples */ |
| s->samples = AV_RL32(buf + 20); |
| frame_flags = AV_RL32(buf + 24); |
| 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_INVALIDDATA; |
| } |
| |
| if (frame_flags & 0x80) { |
| avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; |
| } else if ((frame_flags & 0x03) <= 1) { |
| avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
| } else { |
| avctx->sample_fmt = AV_SAMPLE_FMT_S32P; |
| avctx->bits_per_raw_sample = ((frame_flags & 0x03) + 1) << 3; |
| } |
| |
| while (buf_size > 0) { |
| if (buf_size <= WV_HEADER_SIZE) |
| break; |
| frame_size = AV_RL32(buf + 4) - 12; |
| buf += 20; |
| buf_size -= 20; |
| 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 ((ret = wavpack_decode_block(avctx, s->block, |
| frame, buf, frame_size)) < 0) { |
| wavpack_decode_flush(avctx); |
| return ret; |
| } |
| s->block++; |
| buf += frame_size; |
| buf_size -= frame_size; |
| } |
| |
| if (s->ch_offset != avctx->channels) { |
| av_log(avctx, AV_LOG_ERROR, "Not enough channels coded in a packet.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| *got_frame_ptr = 1; |
| |
| return avpkt->size; |
| } |
| |
| AVCodec ff_wavpack_decoder = { |
| .name = "wavpack", |
| .long_name = NULL_IF_CONFIG_SMALL("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, |
| .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy), |
| .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, |
| }; |
