yading@10: /* yading@10: * MLP decoder yading@10: * Copyright (c) 2007-2008 Ian Caulfield 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: /** yading@10: * @file yading@10: * MLP decoder yading@10: */ yading@10: yading@10: #include yading@10: yading@10: #include "avcodec.h" yading@10: #include "libavutil/intreadwrite.h" yading@10: #include "libavutil/channel_layout.h" yading@10: #include "get_bits.h" yading@10: #include "internal.h" yading@10: #include "libavutil/crc.h" yading@10: #include "parser.h" yading@10: #include "mlp_parser.h" yading@10: #include "mlpdsp.h" yading@10: #include "mlp.h" yading@10: yading@10: /** number of bits used for VLC lookup - longest Huffman code is 9 */ yading@10: #define VLC_BITS 9 yading@10: yading@10: typedef struct SubStream { yading@10: /// Set if a valid restart header has been read. Otherwise the substream cannot be decoded. yading@10: uint8_t restart_seen; yading@10: yading@10: //@{ yading@10: /** restart header data */ yading@10: /// The type of noise to be used in the rematrix stage. yading@10: uint16_t noise_type; yading@10: yading@10: /// The index of the first channel coded in this substream. yading@10: uint8_t min_channel; yading@10: /// The index of the last channel coded in this substream. yading@10: uint8_t max_channel; yading@10: /// The number of channels input into the rematrix stage. yading@10: uint8_t max_matrix_channel; yading@10: /// For each channel output by the matrix, the output channel to map it to yading@10: uint8_t ch_assign[MAX_CHANNELS]; yading@10: /// The channel layout for this substream yading@10: uint64_t ch_layout; yading@10: yading@10: /// Channel coding parameters for channels in the substream yading@10: ChannelParams channel_params[MAX_CHANNELS]; yading@10: yading@10: /// The left shift applied to random noise in 0x31ea substreams. yading@10: uint8_t noise_shift; yading@10: /// The current seed value for the pseudorandom noise generator(s). yading@10: uint32_t noisegen_seed; yading@10: yading@10: /// Set if the substream contains extra info to check the size of VLC blocks. yading@10: uint8_t data_check_present; yading@10: yading@10: /// Bitmask of which parameter sets are conveyed in a decoding parameter block. yading@10: uint8_t param_presence_flags; yading@10: #define PARAM_BLOCKSIZE (1 << 7) yading@10: #define PARAM_MATRIX (1 << 6) yading@10: #define PARAM_OUTSHIFT (1 << 5) yading@10: #define PARAM_QUANTSTEP (1 << 4) yading@10: #define PARAM_FIR (1 << 3) yading@10: #define PARAM_IIR (1 << 2) yading@10: #define PARAM_HUFFOFFSET (1 << 1) yading@10: #define PARAM_PRESENCE (1 << 0) yading@10: //@} yading@10: yading@10: //@{ yading@10: /** matrix data */ yading@10: yading@10: /// Number of matrices to be applied. yading@10: uint8_t num_primitive_matrices; yading@10: yading@10: /// matrix output channel yading@10: uint8_t matrix_out_ch[MAX_MATRICES]; yading@10: yading@10: /// Whether the LSBs of the matrix output are encoded in the bitstream. yading@10: uint8_t lsb_bypass[MAX_MATRICES]; yading@10: /// Matrix coefficients, stored as 2.14 fixed point. yading@10: int32_t matrix_coeff[MAX_MATRICES][MAX_CHANNELS]; yading@10: /// Left shift to apply to noise values in 0x31eb substreams. yading@10: uint8_t matrix_noise_shift[MAX_MATRICES]; yading@10: //@} yading@10: yading@10: /// Left shift to apply to Huffman-decoded residuals. yading@10: uint8_t quant_step_size[MAX_CHANNELS]; yading@10: yading@10: /// number of PCM samples in current audio block yading@10: uint16_t blocksize; yading@10: /// Number of PCM samples decoded so far in this frame. yading@10: uint16_t blockpos; yading@10: yading@10: /// Left shift to apply to decoded PCM values to get final 24-bit output. yading@10: int8_t output_shift[MAX_CHANNELS]; yading@10: yading@10: /// Running XOR of all output samples. yading@10: int32_t lossless_check_data; yading@10: yading@10: } SubStream; yading@10: yading@10: typedef struct MLPDecodeContext { yading@10: AVCodecContext *avctx; yading@10: yading@10: /// Current access unit being read has a major sync. yading@10: int is_major_sync_unit; yading@10: yading@10: /// Set if a valid major sync block has been read. Otherwise no decoding is possible. yading@10: uint8_t params_valid; yading@10: yading@10: /// Number of substreams contained within this stream. yading@10: uint8_t num_substreams; yading@10: yading@10: /// Index of the last substream to decode - further substreams are skipped. yading@10: uint8_t max_decoded_substream; yading@10: yading@10: /// Stream needs channel reordering to comply with FFmpeg's channel order yading@10: uint8_t needs_reordering; yading@10: yading@10: /// number of PCM samples contained in each frame yading@10: int access_unit_size; yading@10: /// next power of two above the number of samples in each frame yading@10: int access_unit_size_pow2; yading@10: yading@10: SubStream substream[MAX_SUBSTREAMS]; yading@10: yading@10: int matrix_changed; yading@10: int filter_changed[MAX_CHANNELS][NUM_FILTERS]; yading@10: yading@10: int8_t noise_buffer[MAX_BLOCKSIZE_POW2]; yading@10: int8_t bypassed_lsbs[MAX_BLOCKSIZE][MAX_CHANNELS]; yading@10: int32_t sample_buffer[MAX_BLOCKSIZE][MAX_CHANNELS]; yading@10: yading@10: MLPDSPContext dsp; yading@10: } MLPDecodeContext; yading@10: yading@10: static const uint64_t thd_channel_order[] = { yading@10: AV_CH_FRONT_LEFT, AV_CH_FRONT_RIGHT, // LR yading@10: AV_CH_FRONT_CENTER, // C yading@10: AV_CH_LOW_FREQUENCY, // LFE yading@10: AV_CH_SIDE_LEFT, AV_CH_SIDE_RIGHT, // LRs yading@10: AV_CH_TOP_FRONT_LEFT, AV_CH_TOP_FRONT_RIGHT, // LRvh yading@10: AV_CH_FRONT_LEFT_OF_CENTER, AV_CH_FRONT_RIGHT_OF_CENTER, // LRc yading@10: AV_CH_BACK_LEFT, AV_CH_BACK_RIGHT, // LRrs yading@10: AV_CH_BACK_CENTER, // Cs yading@10: AV_CH_TOP_CENTER, // Ts yading@10: AV_CH_SURROUND_DIRECT_LEFT, AV_CH_SURROUND_DIRECT_RIGHT, // LRsd yading@10: AV_CH_WIDE_LEFT, AV_CH_WIDE_RIGHT, // LRw yading@10: AV_CH_TOP_FRONT_CENTER, // Cvh yading@10: AV_CH_LOW_FREQUENCY_2, // LFE2 yading@10: }; yading@10: yading@10: static uint64_t thd_channel_layout_extract_channel(uint64_t channel_layout, yading@10: int index) yading@10: { yading@10: int i; yading@10: yading@10: if (av_get_channel_layout_nb_channels(channel_layout) <= index) yading@10: return 0; yading@10: yading@10: for (i = 0; i < FF_ARRAY_ELEMS(thd_channel_order); i++) yading@10: if (channel_layout & thd_channel_order[i] && !index--) yading@10: return thd_channel_order[i]; yading@10: return 0; yading@10: } yading@10: yading@10: static VLC huff_vlc[3]; yading@10: yading@10: /** Initialize static data, constant between all invocations of the codec. */ yading@10: yading@10: static av_cold void init_static(void) yading@10: { yading@10: if (!huff_vlc[0].bits) { yading@10: INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18, yading@10: &ff_mlp_huffman_tables[0][0][1], 2, 1, yading@10: &ff_mlp_huffman_tables[0][0][0], 2, 1, 512); yading@10: INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16, yading@10: &ff_mlp_huffman_tables[1][0][1], 2, 1, yading@10: &ff_mlp_huffman_tables[1][0][0], 2, 1, 512); yading@10: INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15, yading@10: &ff_mlp_huffman_tables[2][0][1], 2, 1, yading@10: &ff_mlp_huffman_tables[2][0][0], 2, 1, 512); yading@10: } yading@10: yading@10: ff_mlp_init_crc(); yading@10: } yading@10: yading@10: static inline int32_t calculate_sign_huff(MLPDecodeContext *m, yading@10: unsigned int substr, unsigned int ch) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: ChannelParams *cp = &s->channel_params[ch]; yading@10: int lsb_bits = cp->huff_lsbs - s->quant_step_size[ch]; yading@10: int sign_shift = lsb_bits + (cp->codebook ? 2 - cp->codebook : -1); yading@10: int32_t sign_huff_offset = cp->huff_offset; yading@10: yading@10: if (cp->codebook > 0) yading@10: sign_huff_offset -= 7 << lsb_bits; yading@10: yading@10: if (sign_shift >= 0) yading@10: sign_huff_offset -= 1 << sign_shift; yading@10: yading@10: return sign_huff_offset; yading@10: } yading@10: yading@10: /** Read a sample, consisting of either, both or neither of entropy-coded MSBs yading@10: * and plain LSBs. */ yading@10: yading@10: static inline int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp, yading@10: unsigned int substr, unsigned int pos) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: unsigned int mat, channel; yading@10: yading@10: for (mat = 0; mat < s->num_primitive_matrices; mat++) yading@10: if (s->lsb_bypass[mat]) yading@10: m->bypassed_lsbs[pos + s->blockpos][mat] = get_bits1(gbp); yading@10: yading@10: for (channel = s->min_channel; channel <= s->max_channel; channel++) { yading@10: ChannelParams *cp = &s->channel_params[channel]; yading@10: int codebook = cp->codebook; yading@10: int quant_step_size = s->quant_step_size[channel]; yading@10: int lsb_bits = cp->huff_lsbs - quant_step_size; yading@10: int result = 0; yading@10: yading@10: if (codebook > 0) yading@10: result = get_vlc2(gbp, huff_vlc[codebook-1].table, yading@10: VLC_BITS, (9 + VLC_BITS - 1) / VLC_BITS); yading@10: yading@10: if (result < 0) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: if (lsb_bits > 0) yading@10: result = (result << lsb_bits) + get_bits(gbp, lsb_bits); yading@10: yading@10: result += cp->sign_huff_offset; yading@10: result <<= quant_step_size; yading@10: yading@10: m->sample_buffer[pos + s->blockpos][channel] = result; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static av_cold int mlp_decode_init(AVCodecContext *avctx) yading@10: { yading@10: MLPDecodeContext *m = avctx->priv_data; yading@10: int substr; yading@10: yading@10: init_static(); yading@10: m->avctx = avctx; yading@10: for (substr = 0; substr < MAX_SUBSTREAMS; substr++) yading@10: m->substream[substr].lossless_check_data = 0xffffffff; yading@10: ff_mlpdsp_init(&m->dsp); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** Read a major sync info header - contains high level information about yading@10: * the stream - sample rate, channel arrangement etc. Most of this yading@10: * information is not actually necessary for decoding, only for playback. yading@10: */ yading@10: yading@10: static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb) yading@10: { yading@10: MLPHeaderInfo mh; yading@10: int substr, ret; yading@10: yading@10: if ((ret = ff_mlp_read_major_sync(m->avctx, &mh, gb)) != 0) yading@10: return ret; yading@10: yading@10: if (mh.group1_bits == 0) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown bits per sample\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: if (mh.group2_bits > mh.group1_bits) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Channel group 2 cannot have more bits per sample than group 1.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (mh.group2_samplerate && mh.group2_samplerate != mh.group1_samplerate) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Channel groups with differing sample rates are not currently supported.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (mh.group1_samplerate == 0) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "invalid/unknown sampling rate\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: if (mh.group1_samplerate > MAX_SAMPLERATE) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Sampling rate %d is greater than the supported maximum (%d).\n", yading@10: mh.group1_samplerate, MAX_SAMPLERATE); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: if (mh.access_unit_size > MAX_BLOCKSIZE) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Block size %d is greater than the supported maximum (%d).\n", yading@10: mh.access_unit_size, MAX_BLOCKSIZE); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: if (mh.access_unit_size_pow2 > MAX_BLOCKSIZE_POW2) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Block size pow2 %d is greater than the supported maximum (%d).\n", yading@10: mh.access_unit_size_pow2, MAX_BLOCKSIZE_POW2); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (mh.num_substreams == 0) yading@10: return AVERROR_INVALIDDATA; yading@10: if (m->avctx->codec_id == AV_CODEC_ID_MLP && mh.num_substreams > 2) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "MLP only supports up to 2 substreams.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: if (mh.num_substreams > MAX_SUBSTREAMS) { yading@10: avpriv_request_sample(m->avctx, yading@10: "%d substreams (more than the " yading@10: "maximum supported by the decoder)", yading@10: mh.num_substreams); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: m->access_unit_size = mh.access_unit_size; yading@10: m->access_unit_size_pow2 = mh.access_unit_size_pow2; yading@10: yading@10: m->num_substreams = mh.num_substreams; yading@10: m->max_decoded_substream = m->num_substreams - 1; yading@10: yading@10: m->avctx->sample_rate = mh.group1_samplerate; yading@10: m->avctx->frame_size = mh.access_unit_size; yading@10: yading@10: m->avctx->bits_per_raw_sample = mh.group1_bits; yading@10: if (mh.group1_bits > 16) yading@10: m->avctx->sample_fmt = AV_SAMPLE_FMT_S32; yading@10: else yading@10: m->avctx->sample_fmt = AV_SAMPLE_FMT_S16; yading@10: yading@10: m->params_valid = 1; yading@10: for (substr = 0; substr < MAX_SUBSTREAMS; substr++) yading@10: m->substream[substr].restart_seen = 0; yading@10: yading@10: /* Set the layout for each substream. When there's more than one, the first yading@10: * substream is Stereo. Subsequent substreams' layouts are indicated in the yading@10: * major sync. */ yading@10: if (m->avctx->codec_id == AV_CODEC_ID_MLP) { yading@10: if ((substr = (mh.num_substreams > 1))) yading@10: m->substream[0].ch_layout = AV_CH_LAYOUT_STEREO; yading@10: m->substream[substr].ch_layout = mh.channel_layout_mlp; yading@10: } else { yading@10: if ((substr = (mh.num_substreams > 1))) yading@10: m->substream[0].ch_layout = AV_CH_LAYOUT_STEREO; yading@10: if (mh.num_substreams > 2) yading@10: if (mh.channel_layout_thd_stream2) yading@10: m->substream[2].ch_layout = mh.channel_layout_thd_stream2; yading@10: else yading@10: m->substream[2].ch_layout = mh.channel_layout_thd_stream1; yading@10: m->substream[substr].ch_layout = mh.channel_layout_thd_stream1; yading@10: yading@10: if (m->avctx->channels<=2 && m->substream[substr].ch_layout == AV_CH_LAYOUT_MONO && m->max_decoded_substream == 1) { yading@10: av_log(m->avctx, AV_LOG_DEBUG, "Mono stream with 2 substreams, ignoring 2nd\n"); yading@10: m->max_decoded_substream = 0; yading@10: if (m->avctx->channels==2) yading@10: m->avctx->channel_layout = AV_CH_LAYOUT_STEREO; yading@10: } yading@10: } yading@10: yading@10: m->needs_reordering = mh.channel_arrangement >= 18 && mh.channel_arrangement <= 20; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** Read a restart header from a block in a substream. This contains parameters yading@10: * required to decode the audio that do not change very often. Generally yading@10: * (always) present only in blocks following a major sync. */ yading@10: yading@10: static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp, yading@10: const uint8_t *buf, unsigned int substr) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: unsigned int ch; yading@10: int sync_word, tmp; yading@10: uint8_t checksum; yading@10: uint8_t lossless_check; yading@10: int start_count = get_bits_count(gbp); yading@10: const int max_matrix_channel = m->avctx->codec_id == AV_CODEC_ID_MLP yading@10: ? MAX_MATRIX_CHANNEL_MLP yading@10: : MAX_MATRIX_CHANNEL_TRUEHD; yading@10: int max_channel, min_channel, matrix_channel; yading@10: yading@10: sync_word = get_bits(gbp, 13); yading@10: yading@10: if (sync_word != 0x31ea >> 1) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "restart header sync incorrect (got 0x%04x)\n", sync_word); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: s->noise_type = get_bits1(gbp); yading@10: yading@10: if (m->avctx->codec_id == AV_CODEC_ID_MLP && s->noise_type) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "MLP must have 0x31ea sync word.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: skip_bits(gbp, 16); /* Output timestamp */ yading@10: yading@10: min_channel = get_bits(gbp, 4); yading@10: max_channel = get_bits(gbp, 4); yading@10: matrix_channel = get_bits(gbp, 4); yading@10: yading@10: if (matrix_channel > max_matrix_channel) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Max matrix channel cannot be greater than %d.\n", yading@10: max_matrix_channel); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (max_channel != matrix_channel) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Max channel must be equal max matrix channel.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: /* This should happen for TrueHD streams with >6 channels and MLP's noise yading@10: * type. It is not yet known if this is allowed. */ yading@10: if (max_channel > MAX_MATRIX_CHANNEL_MLP && !s->noise_type) { yading@10: avpriv_request_sample(m->avctx, yading@10: "%d channels (more than the " yading@10: "maximum supported by the decoder)", yading@10: max_channel + 2); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: if (min_channel > max_channel) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Substream min channel cannot be greater than max channel.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: s->min_channel = min_channel; yading@10: s->max_channel = max_channel; yading@10: s->max_matrix_channel = matrix_channel; yading@10: yading@10: #if FF_API_REQUEST_CHANNELS yading@10: if (m->avctx->request_channels > 0 && yading@10: m->avctx->request_channels <= s->max_channel + 1 && yading@10: m->max_decoded_substream > substr) { yading@10: av_log(m->avctx, AV_LOG_DEBUG, yading@10: "Extracting %d-channel downmix from substream %d. " yading@10: "Further substreams will be skipped.\n", yading@10: s->max_channel + 1, substr); yading@10: m->max_decoded_substream = substr; yading@10: } else yading@10: #endif yading@10: if (m->avctx->request_channel_layout == s->ch_layout && yading@10: m->max_decoded_substream > substr) { yading@10: av_log(m->avctx, AV_LOG_DEBUG, yading@10: "Extracting %d-channel downmix (0x%"PRIx64") from substream %d. " yading@10: "Further substreams will be skipped.\n", yading@10: s->max_channel + 1, s->ch_layout, substr); yading@10: m->max_decoded_substream = substr; yading@10: } yading@10: yading@10: s->noise_shift = get_bits(gbp, 4); yading@10: s->noisegen_seed = get_bits(gbp, 23); yading@10: yading@10: skip_bits(gbp, 19); yading@10: yading@10: s->data_check_present = get_bits1(gbp); yading@10: lossless_check = get_bits(gbp, 8); yading@10: if (substr == m->max_decoded_substream yading@10: && s->lossless_check_data != 0xffffffff) { yading@10: tmp = xor_32_to_8(s->lossless_check_data); yading@10: if (tmp != lossless_check) yading@10: av_log(m->avctx, AV_LOG_WARNING, yading@10: "Lossless check failed - expected %02x, calculated %02x.\n", yading@10: lossless_check, tmp); yading@10: } yading@10: yading@10: skip_bits(gbp, 16); yading@10: yading@10: memset(s->ch_assign, 0, sizeof(s->ch_assign)); yading@10: yading@10: for (ch = 0; ch <= s->max_matrix_channel; ch++) { yading@10: int ch_assign = get_bits(gbp, 6); yading@10: if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD) { yading@10: uint64_t channel = thd_channel_layout_extract_channel(s->ch_layout, yading@10: ch_assign); yading@10: ch_assign = av_get_channel_layout_channel_index(s->ch_layout, yading@10: channel); yading@10: } yading@10: if ((unsigned)ch_assign > s->max_matrix_channel) { yading@10: avpriv_request_sample(m->avctx, yading@10: "Assignment of matrix channel %d to invalid output channel %d", yading@10: ch, ch_assign); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: s->ch_assign[ch_assign] = ch; yading@10: } yading@10: yading@10: checksum = ff_mlp_restart_checksum(buf, get_bits_count(gbp) - start_count); yading@10: yading@10: if (checksum != get_bits(gbp, 8)) yading@10: av_log(m->avctx, AV_LOG_ERROR, "restart header checksum error\n"); yading@10: yading@10: /* Set default decoding parameters. */ yading@10: s->param_presence_flags = 0xff; yading@10: s->num_primitive_matrices = 0; yading@10: s->blocksize = 8; yading@10: s->lossless_check_data = 0; yading@10: yading@10: memset(s->output_shift , 0, sizeof(s->output_shift )); yading@10: memset(s->quant_step_size, 0, sizeof(s->quant_step_size)); yading@10: yading@10: for (ch = s->min_channel; ch <= s->max_channel; ch++) { yading@10: ChannelParams *cp = &s->channel_params[ch]; yading@10: cp->filter_params[FIR].order = 0; yading@10: cp->filter_params[IIR].order = 0; yading@10: cp->filter_params[FIR].shift = 0; yading@10: cp->filter_params[IIR].shift = 0; yading@10: yading@10: /* Default audio coding is 24-bit raw PCM. */ yading@10: cp->huff_offset = 0; yading@10: cp->sign_huff_offset = (-1) << 23; yading@10: cp->codebook = 0; yading@10: cp->huff_lsbs = 24; yading@10: } yading@10: yading@10: if (substr == m->max_decoded_substream) { yading@10: m->avctx->channels = s->max_matrix_channel + 1; yading@10: m->avctx->channel_layout = s->ch_layout; yading@10: yading@10: if (m->avctx->codec_id == AV_CODEC_ID_MLP && m->needs_reordering) { yading@10: if (m->avctx->channel_layout == (AV_CH_LAYOUT_QUAD|AV_CH_LOW_FREQUENCY) || yading@10: m->avctx->channel_layout == AV_CH_LAYOUT_5POINT0_BACK) { yading@10: int i = s->ch_assign[4]; yading@10: s->ch_assign[4] = s->ch_assign[3]; yading@10: s->ch_assign[3] = s->ch_assign[2]; yading@10: s->ch_assign[2] = i; yading@10: } else if (m->avctx->channel_layout == AV_CH_LAYOUT_5POINT1_BACK) { yading@10: FFSWAP(int, s->ch_assign[2], s->ch_assign[4]); yading@10: FFSWAP(int, s->ch_assign[3], s->ch_assign[5]); yading@10: } yading@10: } yading@10: yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** Read parameters for one of the prediction filters. */ yading@10: yading@10: static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp, yading@10: unsigned int substr, unsigned int channel, yading@10: unsigned int filter) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: FilterParams *fp = &s->channel_params[channel].filter_params[filter]; yading@10: const int max_order = filter ? MAX_IIR_ORDER : MAX_FIR_ORDER; yading@10: const char fchar = filter ? 'I' : 'F'; yading@10: int i, order; yading@10: yading@10: // Filter is 0 for FIR, 1 for IIR. yading@10: av_assert0(filter < 2); yading@10: yading@10: if (m->filter_changed[channel][filter]++ > 1) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "Filters may change only once per access unit.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: order = get_bits(gbp, 4); yading@10: if (order > max_order) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "%cIR filter order %d is greater than maximum %d.\n", yading@10: fchar, order, max_order); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: fp->order = order; yading@10: yading@10: if (order > 0) { yading@10: int32_t *fcoeff = s->channel_params[channel].coeff[filter]; yading@10: int coeff_bits, coeff_shift; yading@10: yading@10: fp->shift = get_bits(gbp, 4); yading@10: yading@10: coeff_bits = get_bits(gbp, 5); yading@10: coeff_shift = get_bits(gbp, 3); yading@10: if (coeff_bits < 1 || coeff_bits > 16) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "%cIR filter coeff_bits must be between 1 and 16.\n", yading@10: fchar); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: if (coeff_bits + coeff_shift > 16) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Sum of coeff_bits and coeff_shift for %cIR filter must be 16 or less.\n", yading@10: fchar); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: for (i = 0; i < order; i++) yading@10: fcoeff[i] = get_sbits(gbp, coeff_bits) << coeff_shift; yading@10: yading@10: if (get_bits1(gbp)) { yading@10: int state_bits, state_shift; yading@10: yading@10: if (filter == FIR) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "FIR filter has state data specified.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: state_bits = get_bits(gbp, 4); yading@10: state_shift = get_bits(gbp, 4); yading@10: yading@10: /* TODO: Check validity of state data. */ yading@10: yading@10: for (i = 0; i < order; i++) yading@10: fp->state[i] = state_bits ? get_sbits(gbp, state_bits) << state_shift : 0; yading@10: } yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** Read parameters for primitive matrices. */ yading@10: yading@10: static int read_matrix_params(MLPDecodeContext *m, unsigned int substr, GetBitContext *gbp) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: unsigned int mat, ch; yading@10: const int max_primitive_matrices = m->avctx->codec_id == AV_CODEC_ID_MLP yading@10: ? MAX_MATRICES_MLP yading@10: : MAX_MATRICES_TRUEHD; yading@10: yading@10: if (m->matrix_changed++ > 1) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "Matrices may change only once per access unit.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: s->num_primitive_matrices = get_bits(gbp, 4); yading@10: yading@10: if (s->num_primitive_matrices > max_primitive_matrices) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Number of primitive matrices cannot be greater than %d.\n", yading@10: max_primitive_matrices); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: for (mat = 0; mat < s->num_primitive_matrices; mat++) { yading@10: int frac_bits, max_chan; yading@10: s->matrix_out_ch[mat] = get_bits(gbp, 4); yading@10: frac_bits = get_bits(gbp, 4); yading@10: s->lsb_bypass [mat] = get_bits1(gbp); yading@10: yading@10: if (s->matrix_out_ch[mat] > s->max_matrix_channel) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Invalid channel %d specified as output from matrix.\n", yading@10: s->matrix_out_ch[mat]); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: if (frac_bits > 14) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Too many fractional bits specified.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: max_chan = s->max_matrix_channel; yading@10: if (!s->noise_type) yading@10: max_chan+=2; yading@10: yading@10: for (ch = 0; ch <= max_chan; ch++) { yading@10: int coeff_val = 0; yading@10: if (get_bits1(gbp)) yading@10: coeff_val = get_sbits(gbp, frac_bits + 2); yading@10: yading@10: s->matrix_coeff[mat][ch] = coeff_val << (14 - frac_bits); yading@10: } yading@10: yading@10: if (s->noise_type) yading@10: s->matrix_noise_shift[mat] = get_bits(gbp, 4); yading@10: else yading@10: s->matrix_noise_shift[mat] = 0; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** Read channel parameters. */ yading@10: yading@10: static int read_channel_params(MLPDecodeContext *m, unsigned int substr, yading@10: GetBitContext *gbp, unsigned int ch) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: ChannelParams *cp = &s->channel_params[ch]; yading@10: FilterParams *fir = &cp->filter_params[FIR]; yading@10: FilterParams *iir = &cp->filter_params[IIR]; yading@10: int ret; yading@10: yading@10: if (s->param_presence_flags & PARAM_FIR) yading@10: if (get_bits1(gbp)) yading@10: if ((ret = read_filter_params(m, gbp, substr, ch, FIR)) < 0) yading@10: return ret; yading@10: yading@10: if (s->param_presence_flags & PARAM_IIR) yading@10: if (get_bits1(gbp)) yading@10: if ((ret = read_filter_params(m, gbp, substr, ch, IIR)) < 0) yading@10: return ret; yading@10: yading@10: if (fir->order + iir->order > 8) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "Total filter orders too high.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (fir->order && iir->order && yading@10: fir->shift != iir->shift) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "FIR and IIR filters must use the same precision.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: /* The FIR and IIR filters must have the same precision. yading@10: * To simplify the filtering code, only the precision of the yading@10: * FIR filter is considered. If only the IIR filter is employed, yading@10: * the FIR filter precision is set to that of the IIR filter, so yading@10: * that the filtering code can use it. */ yading@10: if (!fir->order && iir->order) yading@10: fir->shift = iir->shift; yading@10: yading@10: if (s->param_presence_flags & PARAM_HUFFOFFSET) yading@10: if (get_bits1(gbp)) yading@10: cp->huff_offset = get_sbits(gbp, 15); yading@10: yading@10: cp->codebook = get_bits(gbp, 2); yading@10: cp->huff_lsbs = get_bits(gbp, 5); yading@10: yading@10: if (cp->huff_lsbs > 24) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "Invalid huff_lsbs.\n"); yading@10: cp->huff_lsbs = 0; yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: cp->sign_huff_offset = calculate_sign_huff(m, substr, ch); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** Read decoding parameters that change more often than those in the restart yading@10: * header. */ yading@10: yading@10: static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp, yading@10: unsigned int substr) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: unsigned int ch; yading@10: int ret; yading@10: yading@10: if (s->param_presence_flags & PARAM_PRESENCE) yading@10: if (get_bits1(gbp)) yading@10: s->param_presence_flags = get_bits(gbp, 8); yading@10: yading@10: if (s->param_presence_flags & PARAM_BLOCKSIZE) yading@10: if (get_bits1(gbp)) { yading@10: s->blocksize = get_bits(gbp, 9); yading@10: if (s->blocksize < 8 || s->blocksize > m->access_unit_size) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "Invalid blocksize.\n"); yading@10: s->blocksize = 0; yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: } yading@10: yading@10: if (s->param_presence_flags & PARAM_MATRIX) yading@10: if (get_bits1(gbp)) yading@10: if ((ret = read_matrix_params(m, substr, gbp)) < 0) yading@10: return ret; yading@10: yading@10: if (s->param_presence_flags & PARAM_OUTSHIFT) yading@10: if (get_bits1(gbp)) yading@10: for (ch = 0; ch <= s->max_matrix_channel; ch++) yading@10: s->output_shift[ch] = get_sbits(gbp, 4); yading@10: yading@10: if (s->param_presence_flags & PARAM_QUANTSTEP) yading@10: if (get_bits1(gbp)) yading@10: for (ch = 0; ch <= s->max_channel; ch++) { yading@10: ChannelParams *cp = &s->channel_params[ch]; yading@10: yading@10: s->quant_step_size[ch] = get_bits(gbp, 4); yading@10: yading@10: cp->sign_huff_offset = calculate_sign_huff(m, substr, ch); yading@10: } yading@10: yading@10: for (ch = s->min_channel; ch <= s->max_channel; ch++) yading@10: if (get_bits1(gbp)) yading@10: if ((ret = read_channel_params(m, substr, gbp, ch)) < 0) yading@10: return ret; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: #define MSB_MASK(bits) (-1u << bits) yading@10: yading@10: /** Generate PCM samples using the prediction filters and residual values yading@10: * read from the data stream, and update the filter state. */ yading@10: yading@10: static void filter_channel(MLPDecodeContext *m, unsigned int substr, yading@10: unsigned int channel) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: const int32_t *fircoeff = s->channel_params[channel].coeff[FIR]; yading@10: int32_t state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FIR_ORDER]; yading@10: int32_t *firbuf = state_buffer[FIR] + MAX_BLOCKSIZE; yading@10: int32_t *iirbuf = state_buffer[IIR] + MAX_BLOCKSIZE; yading@10: FilterParams *fir = &s->channel_params[channel].filter_params[FIR]; yading@10: FilterParams *iir = &s->channel_params[channel].filter_params[IIR]; yading@10: unsigned int filter_shift = fir->shift; yading@10: int32_t mask = MSB_MASK(s->quant_step_size[channel]); yading@10: yading@10: memcpy(firbuf, fir->state, MAX_FIR_ORDER * sizeof(int32_t)); yading@10: memcpy(iirbuf, iir->state, MAX_IIR_ORDER * sizeof(int32_t)); yading@10: yading@10: m->dsp.mlp_filter_channel(firbuf, fircoeff, yading@10: fir->order, iir->order, yading@10: filter_shift, mask, s->blocksize, yading@10: &m->sample_buffer[s->blockpos][channel]); yading@10: yading@10: memcpy(fir->state, firbuf - s->blocksize, MAX_FIR_ORDER * sizeof(int32_t)); yading@10: memcpy(iir->state, iirbuf - s->blocksize, MAX_IIR_ORDER * sizeof(int32_t)); yading@10: } yading@10: yading@10: /** Read a block of PCM residual data (or actual if no filtering active). */ yading@10: yading@10: static int read_block_data(MLPDecodeContext *m, GetBitContext *gbp, yading@10: unsigned int substr) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: unsigned int i, ch, expected_stream_pos = 0; yading@10: int ret; yading@10: yading@10: if (s->data_check_present) { yading@10: expected_stream_pos = get_bits_count(gbp); yading@10: expected_stream_pos += get_bits(gbp, 16); yading@10: avpriv_request_sample(m->avctx, yading@10: "Substreams with VLC block size check info"); yading@10: } yading@10: yading@10: if (s->blockpos + s->blocksize > m->access_unit_size) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "too many audio samples in frame\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: memset(&m->bypassed_lsbs[s->blockpos][0], 0, yading@10: s->blocksize * sizeof(m->bypassed_lsbs[0])); yading@10: yading@10: for (i = 0; i < s->blocksize; i++) yading@10: if ((ret = read_huff_channels(m, gbp, substr, i)) < 0) yading@10: return ret; yading@10: yading@10: for (ch = s->min_channel; ch <= s->max_channel; ch++) yading@10: filter_channel(m, substr, ch); yading@10: yading@10: s->blockpos += s->blocksize; yading@10: yading@10: if (s->data_check_present) { yading@10: if (get_bits_count(gbp) != expected_stream_pos) yading@10: av_log(m->avctx, AV_LOG_ERROR, "block data length mismatch\n"); yading@10: skip_bits(gbp, 8); yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** Data table used for TrueHD noise generation function. */ yading@10: yading@10: static const int8_t noise_table[256] = { yading@10: 30, 51, 22, 54, 3, 7, -4, 38, 14, 55, 46, 81, 22, 58, -3, 2, yading@10: 52, 31, -7, 51, 15, 44, 74, 30, 85, -17, 10, 33, 18, 80, 28, 62, yading@10: 10, 32, 23, 69, 72, 26, 35, 17, 73, 60, 8, 56, 2, 6, -2, -5, yading@10: 51, 4, 11, 50, 66, 76, 21, 44, 33, 47, 1, 26, 64, 48, 57, 40, yading@10: 38, 16, -10, -28, 92, 22, -18, 29, -10, 5, -13, 49, 19, 24, 70, 34, yading@10: 61, 48, 30, 14, -6, 25, 58, 33, 42, 60, 67, 17, 54, 17, 22, 30, yading@10: 67, 44, -9, 50, -11, 43, 40, 32, 59, 82, 13, 49, -14, 55, 60, 36, yading@10: 48, 49, 31, 47, 15, 12, 4, 65, 1, 23, 29, 39, 45, -2, 84, 69, yading@10: 0, 72, 37, 57, 27, 41, -15, -16, 35, 31, 14, 61, 24, 0, 27, 24, yading@10: 16, 41, 55, 34, 53, 9, 56, 12, 25, 29, 53, 5, 20, -20, -8, 20, yading@10: 13, 28, -3, 78, 38, 16, 11, 62, 46, 29, 21, 24, 46, 65, 43, -23, yading@10: 89, 18, 74, 21, 38, -12, 19, 12, -19, 8, 15, 33, 4, 57, 9, -8, yading@10: 36, 35, 26, 28, 7, 83, 63, 79, 75, 11, 3, 87, 37, 47, 34, 40, yading@10: 39, 19, 20, 42, 27, 34, 39, 77, 13, 42, 59, 64, 45, -1, 32, 37, yading@10: 45, -5, 53, -6, 7, 36, 50, 23, 6, 32, 9, -21, 18, 71, 27, 52, yading@10: -25, 31, 35, 42, -1, 68, 63, 52, 26, 43, 66, 37, 41, 25, 40, 70, yading@10: }; yading@10: yading@10: /** Noise generation functions. yading@10: * I'm not sure what these are for - they seem to be some kind of pseudorandom yading@10: * sequence generators, used to generate noise data which is used when the yading@10: * channels are rematrixed. I'm not sure if they provide a practical benefit yading@10: * to compression, or just obfuscate the decoder. Are they for some kind of yading@10: * dithering? */ yading@10: yading@10: /** Generate two channels of noise, used in the matrix when yading@10: * restart sync word == 0x31ea. */ yading@10: yading@10: static void generate_2_noise_channels(MLPDecodeContext *m, unsigned int substr) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: unsigned int i; yading@10: uint32_t seed = s->noisegen_seed; yading@10: unsigned int maxchan = s->max_matrix_channel; yading@10: yading@10: for (i = 0; i < s->blockpos; i++) { yading@10: uint16_t seed_shr7 = seed >> 7; yading@10: m->sample_buffer[i][maxchan+1] = ((int8_t)(seed >> 15)) << s->noise_shift; yading@10: m->sample_buffer[i][maxchan+2] = ((int8_t) seed_shr7) << s->noise_shift; yading@10: yading@10: seed = (seed << 16) ^ seed_shr7 ^ (seed_shr7 << 5); yading@10: } yading@10: yading@10: s->noisegen_seed = seed; yading@10: } yading@10: yading@10: /** Generate a block of noise, used when restart sync word == 0x31eb. */ yading@10: yading@10: static void fill_noise_buffer(MLPDecodeContext *m, unsigned int substr) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: unsigned int i; yading@10: uint32_t seed = s->noisegen_seed; yading@10: yading@10: for (i = 0; i < m->access_unit_size_pow2; i++) { yading@10: uint8_t seed_shr15 = seed >> 15; yading@10: m->noise_buffer[i] = noise_table[seed_shr15]; yading@10: seed = (seed << 8) ^ seed_shr15 ^ (seed_shr15 << 5); yading@10: } yading@10: yading@10: s->noisegen_seed = seed; yading@10: } yading@10: yading@10: yading@10: /** Apply the channel matrices in turn to reconstruct the original audio yading@10: * samples. */ yading@10: yading@10: static void rematrix_channels(MLPDecodeContext *m, unsigned int substr) yading@10: { yading@10: SubStream *s = &m->substream[substr]; yading@10: unsigned int mat, src_ch, i; yading@10: unsigned int maxchan; yading@10: yading@10: maxchan = s->max_matrix_channel; yading@10: if (!s->noise_type) { yading@10: generate_2_noise_channels(m, substr); yading@10: maxchan += 2; yading@10: } else { yading@10: fill_noise_buffer(m, substr); yading@10: } yading@10: yading@10: for (mat = 0; mat < s->num_primitive_matrices; mat++) { yading@10: int matrix_noise_shift = s->matrix_noise_shift[mat]; yading@10: unsigned int dest_ch = s->matrix_out_ch[mat]; yading@10: int32_t mask = MSB_MASK(s->quant_step_size[dest_ch]); yading@10: int32_t *coeffs = s->matrix_coeff[mat]; yading@10: int index = s->num_primitive_matrices - mat; yading@10: int index2 = 2 * index + 1; yading@10: yading@10: /* TODO: DSPContext? */ yading@10: yading@10: for (i = 0; i < s->blockpos; i++) { yading@10: int32_t bypassed_lsb = m->bypassed_lsbs[i][mat]; yading@10: int32_t *samples = m->sample_buffer[i]; yading@10: int64_t accum = 0; yading@10: yading@10: for (src_ch = 0; src_ch <= maxchan; src_ch++) yading@10: accum += (int64_t) samples[src_ch] * coeffs[src_ch]; yading@10: yading@10: if (matrix_noise_shift) { yading@10: index &= m->access_unit_size_pow2 - 1; yading@10: accum += m->noise_buffer[index] << (matrix_noise_shift + 7); yading@10: index += index2; yading@10: } yading@10: yading@10: samples[dest_ch] = ((accum >> 14) & mask) + bypassed_lsb; yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** Write the audio data into the output buffer. */ yading@10: yading@10: static int output_data(MLPDecodeContext *m, unsigned int substr, yading@10: AVFrame *frame, int *got_frame_ptr) yading@10: { yading@10: AVCodecContext *avctx = m->avctx; yading@10: SubStream *s = &m->substream[substr]; yading@10: unsigned int i, out_ch = 0; yading@10: int32_t *data_32; yading@10: int16_t *data_16; yading@10: int ret; yading@10: int is32 = (m->avctx->sample_fmt == AV_SAMPLE_FMT_S32); yading@10: yading@10: if (m->avctx->channels != s->max_matrix_channel + 1) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "channel count mismatch\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (!s->blockpos) { yading@10: av_log(avctx, AV_LOG_ERROR, "No samples to output.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: /* get output buffer */ yading@10: frame->nb_samples = s->blockpos; yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return ret; yading@10: data_32 = (int32_t *)frame->data[0]; yading@10: data_16 = (int16_t *)frame->data[0]; yading@10: yading@10: for (i = 0; i < s->blockpos; i++) { yading@10: for (out_ch = 0; out_ch <= s->max_matrix_channel; out_ch++) { yading@10: int mat_ch = s->ch_assign[out_ch]; yading@10: int32_t sample = m->sample_buffer[i][mat_ch] yading@10: << s->output_shift[mat_ch]; yading@10: s->lossless_check_data ^= (sample & 0xffffff) << mat_ch; yading@10: if (is32) *data_32++ = sample << 8; yading@10: else *data_16++ = sample >> 8; yading@10: } yading@10: } yading@10: yading@10: *got_frame_ptr = 1; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** Read an access unit from the stream. yading@10: * @return negative on error, 0 if not enough data is present in the input stream, yading@10: * otherwise the number of bytes consumed. */ yading@10: yading@10: static int read_access_unit(AVCodecContext *avctx, void* data, yading@10: int *got_frame_ptr, AVPacket *avpkt) yading@10: { yading@10: const uint8_t *buf = avpkt->data; yading@10: int buf_size = avpkt->size; yading@10: MLPDecodeContext *m = avctx->priv_data; yading@10: GetBitContext gb; yading@10: unsigned int length, substr; yading@10: unsigned int substream_start; yading@10: unsigned int header_size = 4; yading@10: unsigned int substr_header_size = 0; yading@10: uint8_t substream_parity_present[MAX_SUBSTREAMS]; yading@10: uint16_t substream_data_len[MAX_SUBSTREAMS]; yading@10: uint8_t parity_bits; yading@10: int ret; yading@10: yading@10: if (buf_size < 4) yading@10: return 0; yading@10: yading@10: length = (AV_RB16(buf) & 0xfff) * 2; yading@10: yading@10: if (length < 4 || length > buf_size) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: init_get_bits(&gb, (buf + 4), (length - 4) * 8); yading@10: yading@10: m->is_major_sync_unit = 0; yading@10: if (show_bits_long(&gb, 31) == (0xf8726fba >> 1)) { yading@10: if (read_major_sync(m, &gb) < 0) yading@10: goto error; yading@10: m->is_major_sync_unit = 1; yading@10: header_size += 28; yading@10: } yading@10: yading@10: if (!m->params_valid) { yading@10: av_log(m->avctx, AV_LOG_WARNING, yading@10: "Stream parameters not seen; skipping frame.\n"); yading@10: *got_frame_ptr = 0; yading@10: return length; yading@10: } yading@10: yading@10: substream_start = 0; yading@10: yading@10: for (substr = 0; substr < m->num_substreams; substr++) { yading@10: int extraword_present, checkdata_present, end, nonrestart_substr; yading@10: yading@10: extraword_present = get_bits1(&gb); yading@10: nonrestart_substr = get_bits1(&gb); yading@10: checkdata_present = get_bits1(&gb); yading@10: skip_bits1(&gb); yading@10: yading@10: end = get_bits(&gb, 12) * 2; yading@10: yading@10: substr_header_size += 2; yading@10: yading@10: if (extraword_present) { yading@10: if (m->avctx->codec_id == AV_CODEC_ID_MLP) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "There must be no extraword for MLP.\n"); yading@10: goto error; yading@10: } yading@10: skip_bits(&gb, 16); yading@10: substr_header_size += 2; yading@10: } yading@10: yading@10: if (!(nonrestart_substr ^ m->is_major_sync_unit)) { yading@10: av_log(m->avctx, AV_LOG_ERROR, "Invalid nonrestart_substr.\n"); yading@10: goto error; yading@10: } yading@10: yading@10: if (end + header_size + substr_header_size > length) { yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "Indicated length of substream %d data goes off end of " yading@10: "packet.\n", substr); yading@10: end = length - header_size - substr_header_size; yading@10: } yading@10: yading@10: if (end < substream_start) { yading@10: av_log(avctx, AV_LOG_ERROR, yading@10: "Indicated end offset of substream %d data " yading@10: "is smaller than calculated start offset.\n", yading@10: substr); yading@10: goto error; yading@10: } yading@10: yading@10: if (substr > m->max_decoded_substream) yading@10: continue; yading@10: yading@10: substream_parity_present[substr] = checkdata_present; yading@10: substream_data_len[substr] = end - substream_start; yading@10: substream_start = end; yading@10: } yading@10: yading@10: parity_bits = ff_mlp_calculate_parity(buf, 4); yading@10: parity_bits ^= ff_mlp_calculate_parity(buf + header_size, substr_header_size); yading@10: yading@10: if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) { yading@10: av_log(avctx, AV_LOG_ERROR, "Parity check failed.\n"); yading@10: goto error; yading@10: } yading@10: yading@10: buf += header_size + substr_header_size; yading@10: yading@10: for (substr = 0; substr <= m->max_decoded_substream; substr++) { yading@10: SubStream *s = &m->substream[substr]; yading@10: init_get_bits(&gb, buf, substream_data_len[substr] * 8); yading@10: yading@10: m->matrix_changed = 0; yading@10: memset(m->filter_changed, 0, sizeof(m->filter_changed)); yading@10: yading@10: s->blockpos = 0; yading@10: do { yading@10: if (get_bits1(&gb)) { yading@10: if (get_bits1(&gb)) { yading@10: /* A restart header should be present. */ yading@10: if (read_restart_header(m, &gb, buf, substr) < 0) yading@10: goto next_substr; yading@10: s->restart_seen = 1; yading@10: } yading@10: yading@10: if (!s->restart_seen) yading@10: goto next_substr; yading@10: if (read_decoding_params(m, &gb, substr) < 0) yading@10: goto next_substr; yading@10: } yading@10: yading@10: if (!s->restart_seen) yading@10: goto next_substr; yading@10: yading@10: if ((ret = read_block_data(m, &gb, substr)) < 0) yading@10: return ret; yading@10: yading@10: if (get_bits_count(&gb) >= substream_data_len[substr] * 8) yading@10: goto substream_length_mismatch; yading@10: yading@10: } while (!get_bits1(&gb)); yading@10: yading@10: skip_bits(&gb, (-get_bits_count(&gb)) & 15); yading@10: yading@10: if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32) { yading@10: int shorten_by; yading@10: yading@10: if (get_bits(&gb, 16) != 0xD234) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: shorten_by = get_bits(&gb, 16); yading@10: if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD && shorten_by & 0x2000) yading@10: s->blockpos -= FFMIN(shorten_by & 0x1FFF, s->blockpos); yading@10: else if (m->avctx->codec_id == AV_CODEC_ID_MLP && shorten_by != 0xD234) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: if (substr == m->max_decoded_substream) yading@10: av_log(m->avctx, AV_LOG_INFO, "End of stream indicated.\n"); yading@10: } yading@10: yading@10: if (substream_parity_present[substr]) { yading@10: uint8_t parity, checksum; yading@10: yading@10: if (substream_data_len[substr] * 8 - get_bits_count(&gb) != 16) yading@10: goto substream_length_mismatch; yading@10: yading@10: parity = ff_mlp_calculate_parity(buf, substream_data_len[substr] - 2); yading@10: checksum = ff_mlp_checksum8 (buf, substream_data_len[substr] - 2); yading@10: yading@10: if ((get_bits(&gb, 8) ^ parity) != 0xa9 ) yading@10: av_log(m->avctx, AV_LOG_ERROR, "Substream %d parity check failed.\n", substr); yading@10: if ( get_bits(&gb, 8) != checksum) yading@10: av_log(m->avctx, AV_LOG_ERROR, "Substream %d checksum failed.\n" , substr); yading@10: } yading@10: yading@10: if (substream_data_len[substr] * 8 != get_bits_count(&gb)) yading@10: goto substream_length_mismatch; yading@10: yading@10: next_substr: yading@10: if (!s->restart_seen) yading@10: av_log(m->avctx, AV_LOG_ERROR, yading@10: "No restart header present in substream %d.\n", substr); yading@10: yading@10: buf += substream_data_len[substr]; yading@10: } yading@10: yading@10: rematrix_channels(m, m->max_decoded_substream); yading@10: yading@10: if ((ret = output_data(m, m->max_decoded_substream, data, got_frame_ptr)) < 0) yading@10: return ret; yading@10: yading@10: return length; yading@10: yading@10: substream_length_mismatch: yading@10: av_log(m->avctx, AV_LOG_ERROR, "substream %d length mismatch\n", substr); yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: error: yading@10: m->params_valid = 0; yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: #if CONFIG_MLP_DECODER yading@10: AVCodec ff_mlp_decoder = { yading@10: .name = "mlp", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_MLP, yading@10: .priv_data_size = sizeof(MLPDecodeContext), yading@10: .init = mlp_decode_init, yading@10: .decode = read_access_unit, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("MLP (Meridian Lossless Packing)"), yading@10: }; yading@10: #endif yading@10: #if CONFIG_TRUEHD_DECODER yading@10: AVCodec ff_truehd_decoder = { yading@10: .name = "truehd", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_TRUEHD, yading@10: .priv_data_size = sizeof(MLPDecodeContext), yading@10: .init = mlp_decode_init, yading@10: .decode = read_access_unit, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("TrueHD"), yading@10: }; yading@10: #endif /* CONFIG_TRUEHD_DECODER */