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; }