yading@10: /* yading@10: * MPEG-4 ALS decoder yading@10: * Copyright (c) 2009 Thilo Borgmann 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: * MPEG-4 ALS decoder yading@10: * @author Thilo Borgmann yading@10: */ yading@10: yading@10: yading@10: //#define DEBUG yading@10: yading@10: yading@10: #include "avcodec.h" yading@10: #include "get_bits.h" yading@10: #include "unary.h" yading@10: #include "mpeg4audio.h" yading@10: #include "bytestream.h" yading@10: #include "bgmc.h" yading@10: #include "dsputil.h" yading@10: #include "internal.h" yading@10: #include "libavutil/samplefmt.h" yading@10: #include "libavutil/crc.h" yading@10: yading@10: #include yading@10: yading@10: /** Rice parameters and corresponding index offsets for decoding the yading@10: * indices of scaled PARCOR values. The table chosen is set globally yading@10: * by the encoder and stored in ALSSpecificConfig. yading@10: */ yading@10: static const int8_t parcor_rice_table[3][20][2] = { yading@10: { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4}, yading@10: { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3}, yading@10: { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2}, yading@10: { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} }, yading@10: { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4}, yading@10: { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4}, yading@10: {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4}, yading@10: { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} }, yading@10: { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4}, yading@10: { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3}, yading@10: {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3}, yading@10: { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} } yading@10: }; yading@10: yading@10: yading@10: /** Scaled PARCOR values used for the first two PARCOR coefficients. yading@10: * To be indexed by the Rice coded indices. yading@10: * Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20) yading@10: * Actual values are divided by 32 in order to be stored in 16 bits. yading@10: */ yading@10: static const int16_t parcor_scaled_values[] = { yading@10: -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32, yading@10: -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32, yading@10: -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32, yading@10: -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32, yading@10: -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32, yading@10: -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32, yading@10: -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32, yading@10: -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32, yading@10: -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32, yading@10: -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32, yading@10: -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32, yading@10: -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32, yading@10: -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32, yading@10: -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32, yading@10: -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32, yading@10: -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32, yading@10: -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32, yading@10: -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32, yading@10: -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32, yading@10: -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32, yading@10: -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32, yading@10: -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32, yading@10: -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32, yading@10: 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32, yading@10: 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32, yading@10: 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32, yading@10: 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32, yading@10: 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32, yading@10: 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32, yading@10: 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32, yading@10: 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32, yading@10: 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32 yading@10: }; yading@10: yading@10: yading@10: /** Gain values of p(0) for long-term prediction. yading@10: * To be indexed by the Rice coded indices. yading@10: */ yading@10: static const uint8_t ltp_gain_values [4][4] = { yading@10: { 0, 8, 16, 24}, yading@10: {32, 40, 48, 56}, yading@10: {64, 70, 76, 82}, yading@10: {88, 92, 96, 100} yading@10: }; yading@10: yading@10: yading@10: /** Inter-channel weighting factors for multi-channel correlation. yading@10: * To be indexed by the Rice coded indices. yading@10: */ yading@10: static const int16_t mcc_weightings[] = { yading@10: 204, 192, 179, 166, 153, 140, 128, 115, yading@10: 102, 89, 76, 64, 51, 38, 25, 12, yading@10: 0, -12, -25, -38, -51, -64, -76, -89, yading@10: -102, -115, -128, -140, -153, -166, -179, -192 yading@10: }; yading@10: yading@10: yading@10: /** Tail codes used in arithmetic coding using block Gilbert-Moore codes. yading@10: */ yading@10: static const uint8_t tail_code[16][6] = { yading@10: { 74, 44, 25, 13, 7, 3}, yading@10: { 68, 42, 24, 13, 7, 3}, yading@10: { 58, 39, 23, 13, 7, 3}, yading@10: {126, 70, 37, 19, 10, 5}, yading@10: {132, 70, 37, 20, 10, 5}, yading@10: {124, 70, 38, 20, 10, 5}, yading@10: {120, 69, 37, 20, 11, 5}, yading@10: {116, 67, 37, 20, 11, 5}, yading@10: {108, 66, 36, 20, 10, 5}, yading@10: {102, 62, 36, 20, 10, 5}, yading@10: { 88, 58, 34, 19, 10, 5}, yading@10: {162, 89, 49, 25, 13, 7}, yading@10: {156, 87, 49, 26, 14, 7}, yading@10: {150, 86, 47, 26, 14, 7}, yading@10: {142, 84, 47, 26, 14, 7}, yading@10: {131, 79, 46, 26, 14, 7} yading@10: }; yading@10: yading@10: yading@10: enum RA_Flag { yading@10: RA_FLAG_NONE, yading@10: RA_FLAG_FRAMES, yading@10: RA_FLAG_HEADER yading@10: }; yading@10: yading@10: yading@10: typedef struct { yading@10: uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown yading@10: int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit yading@10: int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer yading@10: int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian yading@10: int frame_length; ///< frame length for each frame (last frame may differ) yading@10: int ra_distance; ///< distance between RA frames (in frames, 0...255) yading@10: enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored yading@10: int adapt_order; ///< adaptive order: 1 = on, 0 = off yading@10: int coef_table; ///< table index of Rice code parameters yading@10: int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off yading@10: int max_order; ///< maximum prediction order (0..1023) yading@10: int block_switching; ///< number of block switching levels yading@10: int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only) yading@10: int sb_part; ///< sub-block partition yading@10: int joint_stereo; ///< joint stereo: 1 = on, 0 = off yading@10: int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off yading@10: int chan_config; ///< indicates that a chan_config_info field is present yading@10: int chan_sort; ///< channel rearrangement: 1 = on, 0 = off yading@10: int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off yading@10: int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented. yading@10: int *chan_pos; ///< original channel positions yading@10: int crc_enabled; ///< enable Cyclic Redundancy Checksum yading@10: } ALSSpecificConfig; yading@10: yading@10: yading@10: typedef struct { yading@10: int stop_flag; yading@10: int master_channel; yading@10: int time_diff_flag; yading@10: int time_diff_sign; yading@10: int time_diff_index; yading@10: int weighting[6]; yading@10: } ALSChannelData; yading@10: yading@10: yading@10: typedef struct { yading@10: AVCodecContext *avctx; yading@10: ALSSpecificConfig sconf; yading@10: GetBitContext gb; yading@10: DSPContext dsp; yading@10: const AVCRC *crc_table; yading@10: uint32_t crc_org; ///< CRC value of the original input data yading@10: uint32_t crc; ///< CRC value calculated from decoded data yading@10: unsigned int cur_frame_length; ///< length of the current frame to decode yading@10: unsigned int frame_id; ///< the frame ID / number of the current frame yading@10: unsigned int js_switch; ///< if true, joint-stereo decoding is enforced yading@10: unsigned int cs_switch; ///< if true, channel rearrangement is done yading@10: unsigned int num_blocks; ///< number of blocks used in the current frame yading@10: unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding yading@10: uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC yading@10: int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC yading@10: int ltp_lag_length; ///< number of bits used for ltp lag value yading@10: int *const_block; ///< contains const_block flags for all channels yading@10: unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels yading@10: unsigned int *opt_order; ///< contains opt_order flags for all channels yading@10: int *store_prev_samples; ///< contains store_prev_samples flags for all channels yading@10: int *use_ltp; ///< contains use_ltp flags for all channels yading@10: int *ltp_lag; ///< contains ltp lag values for all channels yading@10: int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel yading@10: int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter yading@10: int32_t **quant_cof; ///< quantized parcor coefficients for a channel yading@10: int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients yading@10: int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel yading@10: int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter yading@10: int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer yading@10: ALSChannelData **chan_data; ///< channel data for multi-channel correlation yading@10: ALSChannelData *chan_data_buffer; ///< contains channel data for all channels yading@10: int *reverted_channels; ///< stores a flag for each reverted channel yading@10: int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block yading@10: int32_t **raw_samples; ///< decoded raw samples for each channel yading@10: int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples yading@10: uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check yading@10: } ALSDecContext; yading@10: yading@10: yading@10: typedef struct { yading@10: unsigned int block_length; ///< number of samples within the block yading@10: unsigned int ra_block; ///< if true, this is a random access block yading@10: int *const_block; ///< if true, this is a constant value block yading@10: int js_blocks; ///< true if this block contains a difference signal yading@10: unsigned int *shift_lsbs; ///< shift of values for this block yading@10: unsigned int *opt_order; ///< prediction order of this block yading@10: int *store_prev_samples;///< if true, carryover samples have to be stored yading@10: int *use_ltp; ///< if true, long-term prediction is used yading@10: int *ltp_lag; ///< lag value for long-term prediction yading@10: int *ltp_gain; ///< gain values for ltp 5-tap filter yading@10: int32_t *quant_cof; ///< quantized parcor coefficients yading@10: int32_t *lpc_cof; ///< coefficients of the direct form prediction yading@10: int32_t *raw_samples; ///< decoded raw samples / residuals for this block yading@10: int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block yading@10: int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair yading@10: } ALSBlockData; yading@10: yading@10: yading@10: static av_cold void dprint_specific_config(ALSDecContext *ctx) yading@10: { yading@10: #ifdef DEBUG yading@10: AVCodecContext *avctx = ctx->avctx; yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: yading@10: av_dlog(avctx, "resolution = %i\n", sconf->resolution); yading@10: av_dlog(avctx, "floating = %i\n", sconf->floating); yading@10: av_dlog(avctx, "frame_length = %i\n", sconf->frame_length); yading@10: av_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance); yading@10: av_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag); yading@10: av_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order); yading@10: av_dlog(avctx, "coef_table = %i\n", sconf->coef_table); yading@10: av_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction); yading@10: av_dlog(avctx, "max_order = %i\n", sconf->max_order); yading@10: av_dlog(avctx, "block_switching = %i\n", sconf->block_switching); yading@10: av_dlog(avctx, "bgmc = %i\n", sconf->bgmc); yading@10: av_dlog(avctx, "sb_part = %i\n", sconf->sb_part); yading@10: av_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo); yading@10: av_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding); yading@10: av_dlog(avctx, "chan_config = %i\n", sconf->chan_config); yading@10: av_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort); yading@10: av_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms); yading@10: av_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info); yading@10: #endif yading@10: } yading@10: yading@10: yading@10: /** Read an ALSSpecificConfig from a buffer into the output struct. yading@10: */ yading@10: static av_cold int read_specific_config(ALSDecContext *ctx) yading@10: { yading@10: GetBitContext gb; yading@10: uint64_t ht_size; yading@10: int i, config_offset; yading@10: MPEG4AudioConfig m4ac; yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: AVCodecContext *avctx = ctx->avctx; yading@10: uint32_t als_id, header_size, trailer_size; yading@10: int ret; yading@10: yading@10: if ((ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size)) < 0) yading@10: return ret; yading@10: yading@10: config_offset = avpriv_mpeg4audio_get_config(&m4ac, avctx->extradata, yading@10: avctx->extradata_size * 8, 1); yading@10: yading@10: if (config_offset < 0) yading@10: return -1; yading@10: yading@10: skip_bits_long(&gb, config_offset); yading@10: yading@10: if (get_bits_left(&gb) < (30 << 3)) yading@10: return -1; yading@10: yading@10: // read the fixed items yading@10: als_id = get_bits_long(&gb, 32); yading@10: avctx->sample_rate = m4ac.sample_rate; yading@10: skip_bits_long(&gb, 32); // sample rate already known yading@10: sconf->samples = get_bits_long(&gb, 32); yading@10: avctx->channels = m4ac.channels; yading@10: skip_bits(&gb, 16); // number of channels already known yading@10: skip_bits(&gb, 3); // skip file_type yading@10: sconf->resolution = get_bits(&gb, 3); yading@10: sconf->floating = get_bits1(&gb); yading@10: sconf->msb_first = get_bits1(&gb); yading@10: sconf->frame_length = get_bits(&gb, 16) + 1; yading@10: sconf->ra_distance = get_bits(&gb, 8); yading@10: sconf->ra_flag = get_bits(&gb, 2); yading@10: sconf->adapt_order = get_bits1(&gb); yading@10: sconf->coef_table = get_bits(&gb, 2); yading@10: sconf->long_term_prediction = get_bits1(&gb); yading@10: sconf->max_order = get_bits(&gb, 10); yading@10: sconf->block_switching = get_bits(&gb, 2); yading@10: sconf->bgmc = get_bits1(&gb); yading@10: sconf->sb_part = get_bits1(&gb); yading@10: sconf->joint_stereo = get_bits1(&gb); yading@10: sconf->mc_coding = get_bits1(&gb); yading@10: sconf->chan_config = get_bits1(&gb); yading@10: sconf->chan_sort = get_bits1(&gb); yading@10: sconf->crc_enabled = get_bits1(&gb); yading@10: sconf->rlslms = get_bits1(&gb); yading@10: skip_bits(&gb, 5); // skip 5 reserved bits yading@10: skip_bits1(&gb); // skip aux_data_enabled yading@10: yading@10: yading@10: // check for ALSSpecificConfig struct yading@10: if (als_id != MKBETAG('A','L','S','\0')) yading@10: return -1; yading@10: yading@10: ctx->cur_frame_length = sconf->frame_length; yading@10: yading@10: // read channel config yading@10: if (sconf->chan_config) yading@10: sconf->chan_config_info = get_bits(&gb, 16); yading@10: // TODO: use this to set avctx->channel_layout yading@10: yading@10: yading@10: // read channel sorting yading@10: if (sconf->chan_sort && avctx->channels > 1) { yading@10: int chan_pos_bits = av_ceil_log2(avctx->channels); yading@10: int bits_needed = avctx->channels * chan_pos_bits + 7; yading@10: if (get_bits_left(&gb) < bits_needed) yading@10: return -1; yading@10: yading@10: if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos)))) yading@10: return AVERROR(ENOMEM); yading@10: yading@10: ctx->cs_switch = 1; yading@10: yading@10: for (i = 0; i < avctx->channels; i++) { yading@10: int idx; yading@10: yading@10: idx = get_bits(&gb, chan_pos_bits); yading@10: if (idx >= avctx->channels) { yading@10: av_log(avctx, AV_LOG_WARNING, "Invalid channel reordering.\n"); yading@10: ctx->cs_switch = 0; yading@10: break; yading@10: } yading@10: sconf->chan_pos[idx] = i; yading@10: } yading@10: yading@10: align_get_bits(&gb); yading@10: } yading@10: yading@10: yading@10: // read fixed header and trailer sizes, yading@10: // if size = 0xFFFFFFFF then there is no data field! yading@10: if (get_bits_left(&gb) < 64) yading@10: return -1; yading@10: yading@10: header_size = get_bits_long(&gb, 32); yading@10: trailer_size = get_bits_long(&gb, 32); yading@10: if (header_size == 0xFFFFFFFF) yading@10: header_size = 0; yading@10: if (trailer_size == 0xFFFFFFFF) yading@10: trailer_size = 0; yading@10: yading@10: ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3; yading@10: yading@10: yading@10: // skip the header and trailer data yading@10: if (get_bits_left(&gb) < ht_size) yading@10: return -1; yading@10: yading@10: if (ht_size > INT32_MAX) yading@10: return -1; yading@10: yading@10: skip_bits_long(&gb, ht_size); yading@10: yading@10: yading@10: // initialize CRC calculation yading@10: if (sconf->crc_enabled) { yading@10: if (get_bits_left(&gb) < 32) yading@10: return -1; yading@10: yading@10: if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) { yading@10: ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE); yading@10: ctx->crc = 0xFFFFFFFF; yading@10: ctx->crc_org = ~get_bits_long(&gb, 32); yading@10: } else yading@10: skip_bits_long(&gb, 32); yading@10: } yading@10: yading@10: yading@10: // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data) yading@10: yading@10: dprint_specific_config(ctx); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Check the ALSSpecificConfig for unsupported features. yading@10: */ yading@10: static int check_specific_config(ALSDecContext *ctx) yading@10: { yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: int error = 0; yading@10: yading@10: // report unsupported feature and set error value yading@10: #define MISSING_ERR(cond, str, errval) \ yading@10: { \ yading@10: if (cond) { \ yading@10: avpriv_report_missing_feature(ctx->avctx, \ yading@10: str); \ yading@10: error = errval; \ yading@10: } \ yading@10: } yading@10: yading@10: MISSING_ERR(sconf->floating, "Floating point decoding", AVERROR_PATCHWELCOME); yading@10: MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME); yading@10: yading@10: return error; yading@10: } yading@10: yading@10: yading@10: /** Parse the bs_info field to extract the block partitioning used in yading@10: * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2. yading@10: */ yading@10: static void parse_bs_info(const uint32_t bs_info, unsigned int n, yading@10: unsigned int div, unsigned int **div_blocks, yading@10: unsigned int *num_blocks) yading@10: { yading@10: if (n < 31 && ((bs_info << n) & 0x40000000)) { yading@10: // if the level is valid and the investigated bit n is set yading@10: // then recursively check both children at bits (2n+1) and (2n+2) yading@10: n *= 2; yading@10: div += 1; yading@10: parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks); yading@10: parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks); yading@10: } else { yading@10: // else the bit is not set or the last level has been reached yading@10: // (bit implicitly not set) yading@10: **div_blocks = div; yading@10: (*div_blocks)++; yading@10: (*num_blocks)++; yading@10: } yading@10: } yading@10: yading@10: yading@10: /** Read and decode a Rice codeword. yading@10: */ yading@10: static int32_t decode_rice(GetBitContext *gb, unsigned int k) yading@10: { yading@10: int max = get_bits_left(gb) - k; yading@10: int q = get_unary(gb, 0, max); yading@10: int r = k ? get_bits1(gb) : !(q & 1); yading@10: yading@10: if (k > 1) { yading@10: q <<= (k - 1); yading@10: q += get_bits_long(gb, k - 1); yading@10: } else if (!k) { yading@10: q >>= 1; yading@10: } yading@10: return r ? q : ~q; yading@10: } yading@10: yading@10: yading@10: /** Convert PARCOR coefficient k to direct filter coefficient. yading@10: */ yading@10: static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof) yading@10: { yading@10: int i, j; yading@10: yading@10: for (i = 0, j = k - 1; i < j; i++, j--) { yading@10: int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20); yading@10: cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20); yading@10: cof[i] += tmp1; yading@10: } yading@10: if (i == j) yading@10: cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20); yading@10: yading@10: cof[k] = par[k]; yading@10: } yading@10: yading@10: yading@10: /** Read block switching field if necessary and set actual block sizes. yading@10: * Also assure that the block sizes of the last frame correspond to the yading@10: * actual number of samples. yading@10: */ yading@10: static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks, yading@10: uint32_t *bs_info) yading@10: { yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: GetBitContext *gb = &ctx->gb; yading@10: unsigned int *ptr_div_blocks = div_blocks; yading@10: unsigned int b; yading@10: yading@10: if (sconf->block_switching) { yading@10: unsigned int bs_info_len = 1 << (sconf->block_switching + 2); yading@10: *bs_info = get_bits_long(gb, bs_info_len); yading@10: *bs_info <<= (32 - bs_info_len); yading@10: } yading@10: yading@10: ctx->num_blocks = 0; yading@10: parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks); yading@10: yading@10: // The last frame may have an overdetermined block structure given in yading@10: // the bitstream. In that case the defined block structure would need yading@10: // more samples than available to be consistent. yading@10: // The block structure is actually used but the block sizes are adapted yading@10: // to fit the actual number of available samples. yading@10: // Example: 5 samples, 2nd level block sizes: 2 2 2 2. yading@10: // This results in the actual block sizes: 2 2 1 0. yading@10: // This is not specified in 14496-3 but actually done by the reference yading@10: // codec RM22 revision 2. yading@10: // This appears to happen in case of an odd number of samples in the last yading@10: // frame which is actually not allowed by the block length switching part yading@10: // of 14496-3. yading@10: // The ALS conformance files feature an odd number of samples in the last yading@10: // frame. yading@10: yading@10: for (b = 0; b < ctx->num_blocks; b++) yading@10: div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b]; yading@10: yading@10: if (ctx->cur_frame_length != ctx->sconf.frame_length) { yading@10: unsigned int remaining = ctx->cur_frame_length; yading@10: yading@10: for (b = 0; b < ctx->num_blocks; b++) { yading@10: if (remaining <= div_blocks[b]) { yading@10: div_blocks[b] = remaining; yading@10: ctx->num_blocks = b + 1; yading@10: break; yading@10: } yading@10: yading@10: remaining -= div_blocks[b]; yading@10: } yading@10: } yading@10: } yading@10: yading@10: yading@10: /** Read the block data for a constant block yading@10: */ yading@10: static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd) yading@10: { yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: AVCodecContext *avctx = ctx->avctx; yading@10: GetBitContext *gb = &ctx->gb; yading@10: yading@10: if (bd->block_length <= 0) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: *bd->raw_samples = 0; yading@10: *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence) yading@10: bd->js_blocks = get_bits1(gb); yading@10: yading@10: // skip 5 reserved bits yading@10: skip_bits(gb, 5); yading@10: yading@10: if (*bd->const_block) { yading@10: unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample; yading@10: *bd->raw_samples = get_sbits_long(gb, const_val_bits); yading@10: } yading@10: yading@10: // ensure constant block decoding by reusing this field yading@10: *bd->const_block = 1; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Decode the block data for a constant block yading@10: */ yading@10: static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd) yading@10: { yading@10: int smp = bd->block_length - 1; yading@10: int32_t val = *bd->raw_samples; yading@10: int32_t *dst = bd->raw_samples + 1; yading@10: yading@10: // write raw samples into buffer yading@10: for (; smp; smp--) yading@10: *dst++ = val; yading@10: } yading@10: yading@10: yading@10: /** Read the block data for a non-constant block yading@10: */ yading@10: static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd) yading@10: { yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: AVCodecContext *avctx = ctx->avctx; yading@10: GetBitContext *gb = &ctx->gb; yading@10: unsigned int k; yading@10: unsigned int s[8]; yading@10: unsigned int sx[8]; yading@10: unsigned int sub_blocks, log2_sub_blocks, sb_length; yading@10: unsigned int start = 0; yading@10: unsigned int opt_order; yading@10: int sb; yading@10: int32_t *quant_cof = bd->quant_cof; yading@10: int32_t *current_res; yading@10: yading@10: yading@10: // ensure variable block decoding by reusing this field yading@10: *bd->const_block = 0; yading@10: yading@10: *bd->opt_order = 1; yading@10: bd->js_blocks = get_bits1(gb); yading@10: yading@10: opt_order = *bd->opt_order; yading@10: yading@10: // determine the number of subblocks for entropy decoding yading@10: if (!sconf->bgmc && !sconf->sb_part) { yading@10: log2_sub_blocks = 0; yading@10: } else { yading@10: if (sconf->bgmc && sconf->sb_part) yading@10: log2_sub_blocks = get_bits(gb, 2); yading@10: else yading@10: log2_sub_blocks = 2 * get_bits1(gb); yading@10: } yading@10: yading@10: sub_blocks = 1 << log2_sub_blocks; yading@10: yading@10: // do not continue in case of a damaged stream since yading@10: // block_length must be evenly divisible by sub_blocks yading@10: if (bd->block_length & (sub_blocks - 1)) { yading@10: av_log(avctx, AV_LOG_WARNING, yading@10: "Block length is not evenly divisible by the number of subblocks.\n"); yading@10: return -1; yading@10: } yading@10: yading@10: sb_length = bd->block_length >> log2_sub_blocks; yading@10: yading@10: if (sconf->bgmc) { yading@10: s[0] = get_bits(gb, 8 + (sconf->resolution > 1)); yading@10: for (k = 1; k < sub_blocks; k++) yading@10: s[k] = s[k - 1] + decode_rice(gb, 2); yading@10: yading@10: for (k = 0; k < sub_blocks; k++) { yading@10: sx[k] = s[k] & 0x0F; yading@10: s [k] >>= 4; yading@10: } yading@10: } else { yading@10: s[0] = get_bits(gb, 4 + (sconf->resolution > 1)); yading@10: for (k = 1; k < sub_blocks; k++) yading@10: s[k] = s[k - 1] + decode_rice(gb, 0); yading@10: } yading@10: for (k = 1; k < sub_blocks; k++) yading@10: if (s[k] > 32) { yading@10: av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (get_bits1(gb)) yading@10: *bd->shift_lsbs = get_bits(gb, 4) + 1; yading@10: yading@10: *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs; yading@10: yading@10: yading@10: if (!sconf->rlslms) { yading@10: if (sconf->adapt_order) { yading@10: int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1, yading@10: 2, sconf->max_order + 1)); yading@10: *bd->opt_order = get_bits(gb, opt_order_length); yading@10: if (*bd->opt_order > sconf->max_order) { yading@10: *bd->opt_order = sconf->max_order; yading@10: av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: } else { yading@10: *bd->opt_order = sconf->max_order; yading@10: } yading@10: yading@10: opt_order = *bd->opt_order; yading@10: yading@10: if (opt_order) { yading@10: int add_base; yading@10: yading@10: if (sconf->coef_table == 3) { yading@10: add_base = 0x7F; yading@10: yading@10: // read coefficient 0 yading@10: quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)]; yading@10: yading@10: // read coefficient 1 yading@10: if (opt_order > 1) yading@10: quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)]; yading@10: yading@10: // read coefficients 2 to opt_order yading@10: for (k = 2; k < opt_order; k++) yading@10: quant_cof[k] = get_bits(gb, 7); yading@10: } else { yading@10: int k_max; yading@10: add_base = 1; yading@10: yading@10: // read coefficient 0 to 19 yading@10: k_max = FFMIN(opt_order, 20); yading@10: for (k = 0; k < k_max; k++) { yading@10: int rice_param = parcor_rice_table[sconf->coef_table][k][1]; yading@10: int offset = parcor_rice_table[sconf->coef_table][k][0]; yading@10: quant_cof[k] = decode_rice(gb, rice_param) + offset; yading@10: if (quant_cof[k] < -64 || quant_cof[k] > 63) { yading@10: av_log(avctx, AV_LOG_ERROR, "quant_cof %d is out of range.\n", quant_cof[k]); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: } yading@10: yading@10: // read coefficients 20 to 126 yading@10: k_max = FFMIN(opt_order, 127); yading@10: for (; k < k_max; k++) yading@10: quant_cof[k] = decode_rice(gb, 2) + (k & 1); yading@10: yading@10: // read coefficients 127 to opt_order yading@10: for (; k < opt_order; k++) yading@10: quant_cof[k] = decode_rice(gb, 1); yading@10: yading@10: quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64]; yading@10: yading@10: if (opt_order > 1) yading@10: quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64]; yading@10: } yading@10: yading@10: for (k = 2; k < opt_order; k++) yading@10: quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13); yading@10: } yading@10: } yading@10: yading@10: // read LTP gain and lag values yading@10: if (sconf->long_term_prediction) { yading@10: *bd->use_ltp = get_bits1(gb); yading@10: yading@10: if (*bd->use_ltp) { yading@10: int r, c; yading@10: yading@10: bd->ltp_gain[0] = decode_rice(gb, 1) << 3; yading@10: bd->ltp_gain[1] = decode_rice(gb, 2) << 3; yading@10: yading@10: r = get_unary(gb, 0, 3); yading@10: c = get_bits(gb, 2); yading@10: bd->ltp_gain[2] = ltp_gain_values[r][c]; yading@10: yading@10: bd->ltp_gain[3] = decode_rice(gb, 2) << 3; yading@10: bd->ltp_gain[4] = decode_rice(gb, 1) << 3; yading@10: yading@10: *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length); yading@10: *bd->ltp_lag += FFMAX(4, opt_order + 1); yading@10: } yading@10: } yading@10: yading@10: // read first value and residuals in case of a random access block yading@10: if (bd->ra_block) { yading@10: if (opt_order) yading@10: bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4); yading@10: if (opt_order > 1) yading@10: bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max)); yading@10: if (opt_order > 2) yading@10: bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max)); yading@10: yading@10: start = FFMIN(opt_order, 3); yading@10: } yading@10: yading@10: // read all residuals yading@10: if (sconf->bgmc) { yading@10: int delta[8]; yading@10: unsigned int k [8]; yading@10: unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5); yading@10: yading@10: // read most significant bits yading@10: unsigned int high; yading@10: unsigned int low; yading@10: unsigned int value; yading@10: yading@10: ff_bgmc_decode_init(gb, &high, &low, &value); yading@10: yading@10: current_res = bd->raw_samples + start; yading@10: yading@10: for (sb = 0; sb < sub_blocks; sb++) { yading@10: unsigned int sb_len = sb_length - (sb ? 0 : start); yading@10: yading@10: k [sb] = s[sb] > b ? s[sb] - b : 0; yading@10: delta[sb] = 5 - s[sb] + k[sb]; yading@10: yading@10: ff_bgmc_decode(gb, sb_len, current_res, yading@10: delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status); yading@10: yading@10: current_res += sb_len; yading@10: } yading@10: yading@10: ff_bgmc_decode_end(gb); yading@10: yading@10: yading@10: // read least significant bits and tails yading@10: current_res = bd->raw_samples + start; yading@10: yading@10: for (sb = 0; sb < sub_blocks; sb++, start = 0) { yading@10: unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]]; yading@10: unsigned int cur_k = k[sb]; yading@10: unsigned int cur_s = s[sb]; yading@10: yading@10: for (; start < sb_length; start++) { yading@10: int32_t res = *current_res; yading@10: yading@10: if (res == cur_tail_code) { yading@10: unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10)) yading@10: << (5 - delta[sb]); yading@10: yading@10: res = decode_rice(gb, cur_s); yading@10: yading@10: if (res >= 0) { yading@10: res += (max_msb ) << cur_k; yading@10: } else { yading@10: res -= (max_msb - 1) << cur_k; yading@10: } yading@10: } else { yading@10: if (res > cur_tail_code) yading@10: res--; yading@10: yading@10: if (res & 1) yading@10: res = -res; yading@10: yading@10: res >>= 1; yading@10: yading@10: if (cur_k) { yading@10: res <<= cur_k; yading@10: res |= get_bits_long(gb, cur_k); yading@10: } yading@10: } yading@10: yading@10: *current_res++ = res; yading@10: } yading@10: } yading@10: } else { yading@10: current_res = bd->raw_samples + start; yading@10: yading@10: for (sb = 0; sb < sub_blocks; sb++, start = 0) yading@10: for (; start < sb_length; start++) yading@10: *current_res++ = decode_rice(gb, s[sb]); yading@10: } yading@10: yading@10: if (!sconf->mc_coding || ctx->js_switch) yading@10: align_get_bits(gb); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Decode the block data for a non-constant block yading@10: */ yading@10: static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd) yading@10: { yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: unsigned int block_length = bd->block_length; yading@10: unsigned int smp = 0; yading@10: unsigned int k; yading@10: int opt_order = *bd->opt_order; yading@10: int sb; yading@10: int64_t y; yading@10: int32_t *quant_cof = bd->quant_cof; yading@10: int32_t *lpc_cof = bd->lpc_cof; yading@10: int32_t *raw_samples = bd->raw_samples; yading@10: int32_t *raw_samples_end = bd->raw_samples + bd->block_length; yading@10: int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer; yading@10: yading@10: // reverse long-term prediction yading@10: if (*bd->use_ltp) { yading@10: int ltp_smp; yading@10: yading@10: for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) { yading@10: int center = ltp_smp - *bd->ltp_lag; yading@10: int begin = FFMAX(0, center - 2); yading@10: int end = center + 3; yading@10: int tab = 5 - (end - begin); yading@10: int base; yading@10: yading@10: y = 1 << 6; yading@10: yading@10: for (base = begin; base < end; base++, tab++) yading@10: y += MUL64(bd->ltp_gain[tab], raw_samples[base]); yading@10: yading@10: raw_samples[ltp_smp] += y >> 7; yading@10: } yading@10: } yading@10: yading@10: // reconstruct all samples from residuals yading@10: if (bd->ra_block) { yading@10: for (smp = 0; smp < opt_order; smp++) { yading@10: y = 1 << 19; yading@10: yading@10: for (sb = 0; sb < smp; sb++) yading@10: y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]); yading@10: yading@10: *raw_samples++ -= y >> 20; yading@10: parcor_to_lpc(smp, quant_cof, lpc_cof); yading@10: } yading@10: } else { yading@10: for (k = 0; k < opt_order; k++) yading@10: parcor_to_lpc(k, quant_cof, lpc_cof); yading@10: yading@10: // store previous samples in case that they have to be altered yading@10: if (*bd->store_prev_samples) yading@10: memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order, yading@10: sizeof(*bd->prev_raw_samples) * sconf->max_order); yading@10: yading@10: // reconstruct difference signal for prediction (joint-stereo) yading@10: if (bd->js_blocks && bd->raw_other) { yading@10: int32_t *left, *right; yading@10: yading@10: if (bd->raw_other > raw_samples) { // D = R - L yading@10: left = raw_samples; yading@10: right = bd->raw_other; yading@10: } else { // D = R - L yading@10: left = bd->raw_other; yading@10: right = raw_samples; yading@10: } yading@10: yading@10: for (sb = -1; sb >= -sconf->max_order; sb--) yading@10: raw_samples[sb] = right[sb] - left[sb]; yading@10: } yading@10: yading@10: // reconstruct shifted signal yading@10: if (*bd->shift_lsbs) yading@10: for (sb = -1; sb >= -sconf->max_order; sb--) yading@10: raw_samples[sb] >>= *bd->shift_lsbs; yading@10: } yading@10: yading@10: // reverse linear prediction coefficients for efficiency yading@10: lpc_cof = lpc_cof + opt_order; yading@10: yading@10: for (sb = 0; sb < opt_order; sb++) yading@10: lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)]; yading@10: yading@10: // reconstruct raw samples yading@10: raw_samples = bd->raw_samples + smp; yading@10: lpc_cof = lpc_cof_reversed + opt_order; yading@10: yading@10: for (; raw_samples < raw_samples_end; raw_samples++) { yading@10: y = 1 << 19; yading@10: yading@10: for (sb = -opt_order; sb < 0; sb++) yading@10: y += MUL64(lpc_cof[sb], raw_samples[sb]); yading@10: yading@10: *raw_samples -= y >> 20; yading@10: } yading@10: yading@10: raw_samples = bd->raw_samples; yading@10: yading@10: // restore previous samples in case that they have been altered yading@10: if (*bd->store_prev_samples) yading@10: memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples, yading@10: sizeof(*raw_samples) * sconf->max_order); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Read the block data. yading@10: */ yading@10: static int read_block(ALSDecContext *ctx, ALSBlockData *bd) yading@10: { yading@10: GetBitContext *gb = &ctx->gb; yading@10: int ret; yading@10: yading@10: *bd->shift_lsbs = 0; yading@10: // read block type flag and read the samples accordingly yading@10: if (get_bits1(gb)) { yading@10: if ((ret = read_var_block_data(ctx, bd)) < 0) yading@10: return ret; yading@10: } else { yading@10: if ((ret = read_const_block_data(ctx, bd)) < 0) yading@10: return ret; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Decode the block data. yading@10: */ yading@10: static int decode_block(ALSDecContext *ctx, ALSBlockData *bd) yading@10: { yading@10: unsigned int smp; yading@10: yading@10: // read block type flag and read the samples accordingly yading@10: if (*bd->const_block) yading@10: decode_const_block_data(ctx, bd); yading@10: else if (decode_var_block_data(ctx, bd)) yading@10: return -1; yading@10: yading@10: // TODO: read RLSLMS extension data yading@10: yading@10: if (*bd->shift_lsbs) yading@10: for (smp = 0; smp < bd->block_length; smp++) yading@10: bd->raw_samples[smp] <<= *bd->shift_lsbs; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Read and decode block data successively. yading@10: */ yading@10: static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd) yading@10: { yading@10: int ret; yading@10: yading@10: ret = read_block(ctx, bd); yading@10: yading@10: if (ret) yading@10: return ret; yading@10: yading@10: ret = decode_block(ctx, bd); yading@10: yading@10: return ret; yading@10: } yading@10: yading@10: yading@10: /** Compute the number of samples left to decode for the current frame and yading@10: * sets these samples to zero. yading@10: */ yading@10: static void zero_remaining(unsigned int b, unsigned int b_max, yading@10: const unsigned int *div_blocks, int32_t *buf) yading@10: { yading@10: unsigned int count = 0; yading@10: yading@10: while (b < b_max) yading@10: count += div_blocks[b++]; yading@10: yading@10: if (count) yading@10: memset(buf, 0, sizeof(*buf) * count); yading@10: } yading@10: yading@10: yading@10: /** Decode blocks independently. yading@10: */ yading@10: static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame, yading@10: unsigned int c, const unsigned int *div_blocks, yading@10: unsigned int *js_blocks) yading@10: { yading@10: unsigned int b; yading@10: ALSBlockData bd = { 0 }; yading@10: yading@10: bd.ra_block = ra_frame; yading@10: bd.const_block = ctx->const_block; yading@10: bd.shift_lsbs = ctx->shift_lsbs; yading@10: bd.opt_order = ctx->opt_order; yading@10: bd.store_prev_samples = ctx->store_prev_samples; yading@10: bd.use_ltp = ctx->use_ltp; yading@10: bd.ltp_lag = ctx->ltp_lag; yading@10: bd.ltp_gain = ctx->ltp_gain[0]; yading@10: bd.quant_cof = ctx->quant_cof[0]; yading@10: bd.lpc_cof = ctx->lpc_cof[0]; yading@10: bd.prev_raw_samples = ctx->prev_raw_samples; yading@10: bd.raw_samples = ctx->raw_samples[c]; yading@10: yading@10: yading@10: for (b = 0; b < ctx->num_blocks; b++) { yading@10: bd.block_length = div_blocks[b]; yading@10: yading@10: if (read_decode_block(ctx, &bd)) { yading@10: // damaged block, write zero for the rest of the frame yading@10: zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples); yading@10: return -1; yading@10: } yading@10: bd.raw_samples += div_blocks[b]; yading@10: bd.ra_block = 0; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Decode blocks dependently. yading@10: */ yading@10: static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame, yading@10: unsigned int c, const unsigned int *div_blocks, yading@10: unsigned int *js_blocks) yading@10: { yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: unsigned int offset = 0; yading@10: unsigned int b; yading@10: ALSBlockData bd[2] = { { 0 } }; yading@10: yading@10: bd[0].ra_block = ra_frame; yading@10: bd[0].const_block = ctx->const_block; yading@10: bd[0].shift_lsbs = ctx->shift_lsbs; yading@10: bd[0].opt_order = ctx->opt_order; yading@10: bd[0].store_prev_samples = ctx->store_prev_samples; yading@10: bd[0].use_ltp = ctx->use_ltp; yading@10: bd[0].ltp_lag = ctx->ltp_lag; yading@10: bd[0].ltp_gain = ctx->ltp_gain[0]; yading@10: bd[0].quant_cof = ctx->quant_cof[0]; yading@10: bd[0].lpc_cof = ctx->lpc_cof[0]; yading@10: bd[0].prev_raw_samples = ctx->prev_raw_samples; yading@10: bd[0].js_blocks = *js_blocks; yading@10: yading@10: bd[1].ra_block = ra_frame; yading@10: bd[1].const_block = ctx->const_block; yading@10: bd[1].shift_lsbs = ctx->shift_lsbs; yading@10: bd[1].opt_order = ctx->opt_order; yading@10: bd[1].store_prev_samples = ctx->store_prev_samples; yading@10: bd[1].use_ltp = ctx->use_ltp; yading@10: bd[1].ltp_lag = ctx->ltp_lag; yading@10: bd[1].ltp_gain = ctx->ltp_gain[0]; yading@10: bd[1].quant_cof = ctx->quant_cof[0]; yading@10: bd[1].lpc_cof = ctx->lpc_cof[0]; yading@10: bd[1].prev_raw_samples = ctx->prev_raw_samples; yading@10: bd[1].js_blocks = *(js_blocks + 1); yading@10: yading@10: // decode all blocks yading@10: for (b = 0; b < ctx->num_blocks; b++) { yading@10: unsigned int s; yading@10: yading@10: bd[0].block_length = div_blocks[b]; yading@10: bd[1].block_length = div_blocks[b]; yading@10: yading@10: bd[0].raw_samples = ctx->raw_samples[c ] + offset; yading@10: bd[1].raw_samples = ctx->raw_samples[c + 1] + offset; yading@10: yading@10: bd[0].raw_other = bd[1].raw_samples; yading@10: bd[1].raw_other = bd[0].raw_samples; yading@10: yading@10: if(read_decode_block(ctx, &bd[0]) || read_decode_block(ctx, &bd[1])) { yading@10: // damaged block, write zero for the rest of the frame yading@10: zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples); yading@10: zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples); yading@10: return -1; yading@10: } yading@10: yading@10: // reconstruct joint-stereo blocks yading@10: if (bd[0].js_blocks) { yading@10: if (bd[1].js_blocks) yading@10: av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n"); yading@10: yading@10: for (s = 0; s < div_blocks[b]; s++) yading@10: bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s]; yading@10: } else if (bd[1].js_blocks) { yading@10: for (s = 0; s < div_blocks[b]; s++) yading@10: bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s]; yading@10: } yading@10: yading@10: offset += div_blocks[b]; yading@10: bd[0].ra_block = 0; yading@10: bd[1].ra_block = 0; yading@10: } yading@10: yading@10: // store carryover raw samples, yading@10: // the others channel raw samples are stored by the calling function. yading@10: memmove(ctx->raw_samples[c] - sconf->max_order, yading@10: ctx->raw_samples[c] - sconf->max_order + sconf->frame_length, yading@10: sizeof(*ctx->raw_samples[c]) * sconf->max_order); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Read the channel data. yading@10: */ yading@10: static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c) yading@10: { yading@10: GetBitContext *gb = &ctx->gb; yading@10: ALSChannelData *current = cd; yading@10: unsigned int channels = ctx->avctx->channels; yading@10: int entries = 0; yading@10: yading@10: while (entries < channels && !(current->stop_flag = get_bits1(gb))) { yading@10: current->master_channel = get_bits_long(gb, av_ceil_log2(channels)); yading@10: yading@10: if (current->master_channel >= channels) { yading@10: av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel.\n"); yading@10: return -1; yading@10: } yading@10: yading@10: if (current->master_channel != c) { yading@10: current->time_diff_flag = get_bits1(gb); yading@10: current->weighting[0] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)]; yading@10: current->weighting[1] = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 31)]; yading@10: current->weighting[2] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)]; yading@10: yading@10: if (current->time_diff_flag) { yading@10: current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)]; yading@10: current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)]; yading@10: current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)]; yading@10: yading@10: current->time_diff_sign = get_bits1(gb); yading@10: current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3; yading@10: } yading@10: } yading@10: yading@10: current++; yading@10: entries++; yading@10: } yading@10: yading@10: if (entries == channels) { yading@10: av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data.\n"); yading@10: return -1; yading@10: } yading@10: yading@10: align_get_bits(gb); yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Recursively reverts the inter-channel correlation for a block. yading@10: */ yading@10: static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd, yading@10: ALSChannelData **cd, int *reverted, yading@10: unsigned int offset, int c) yading@10: { yading@10: ALSChannelData *ch = cd[c]; yading@10: unsigned int dep = 0; yading@10: unsigned int channels = ctx->avctx->channels; yading@10: yading@10: if (reverted[c]) yading@10: return 0; yading@10: yading@10: reverted[c] = 1; yading@10: yading@10: while (dep < channels && !ch[dep].stop_flag) { yading@10: revert_channel_correlation(ctx, bd, cd, reverted, offset, yading@10: ch[dep].master_channel); yading@10: yading@10: dep++; yading@10: } yading@10: yading@10: if (dep == channels) { yading@10: av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n"); yading@10: return -1; yading@10: } yading@10: yading@10: bd->const_block = ctx->const_block + c; yading@10: bd->shift_lsbs = ctx->shift_lsbs + c; yading@10: bd->opt_order = ctx->opt_order + c; yading@10: bd->store_prev_samples = ctx->store_prev_samples + c; yading@10: bd->use_ltp = ctx->use_ltp + c; yading@10: bd->ltp_lag = ctx->ltp_lag + c; yading@10: bd->ltp_gain = ctx->ltp_gain[c]; yading@10: bd->lpc_cof = ctx->lpc_cof[c]; yading@10: bd->quant_cof = ctx->quant_cof[c]; yading@10: bd->raw_samples = ctx->raw_samples[c] + offset; yading@10: yading@10: dep = 0; yading@10: while (!ch[dep].stop_flag) { yading@10: unsigned int smp; yading@10: unsigned int begin = 1; yading@10: unsigned int end = bd->block_length - 1; yading@10: int64_t y; yading@10: int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset; yading@10: yading@10: if (ch[dep].time_diff_flag) { yading@10: int t = ch[dep].time_diff_index; yading@10: yading@10: if (ch[dep].time_diff_sign) { yading@10: t = -t; yading@10: begin -= t; yading@10: } else { yading@10: end -= t; yading@10: } yading@10: yading@10: for (smp = begin; smp < end; smp++) { yading@10: y = (1 << 6) + yading@10: MUL64(ch[dep].weighting[0], master[smp - 1 ]) + yading@10: MUL64(ch[dep].weighting[1], master[smp ]) + yading@10: MUL64(ch[dep].weighting[2], master[smp + 1 ]) + yading@10: MUL64(ch[dep].weighting[3], master[smp - 1 + t]) + yading@10: MUL64(ch[dep].weighting[4], master[smp + t]) + yading@10: MUL64(ch[dep].weighting[5], master[smp + 1 + t]); yading@10: yading@10: bd->raw_samples[smp] += y >> 7; yading@10: } yading@10: } else { yading@10: for (smp = begin; smp < end; smp++) { yading@10: y = (1 << 6) + yading@10: MUL64(ch[dep].weighting[0], master[smp - 1]) + yading@10: MUL64(ch[dep].weighting[1], master[smp ]) + yading@10: MUL64(ch[dep].weighting[2], master[smp + 1]); yading@10: yading@10: bd->raw_samples[smp] += y >> 7; yading@10: } yading@10: } yading@10: yading@10: dep++; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Read the frame data. yading@10: */ yading@10: static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame) yading@10: { yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: AVCodecContext *avctx = ctx->avctx; yading@10: GetBitContext *gb = &ctx->gb; yading@10: unsigned int div_blocks[32]; ///< block sizes. yading@10: unsigned int c; yading@10: unsigned int js_blocks[2]; yading@10: yading@10: uint32_t bs_info = 0; yading@10: yading@10: // skip the size of the ra unit if present in the frame yading@10: if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame) yading@10: skip_bits_long(gb, 32); yading@10: yading@10: if (sconf->mc_coding && sconf->joint_stereo) { yading@10: ctx->js_switch = get_bits1(gb); yading@10: align_get_bits(gb); yading@10: } yading@10: yading@10: if (!sconf->mc_coding || ctx->js_switch) { yading@10: int independent_bs = !sconf->joint_stereo; yading@10: yading@10: for (c = 0; c < avctx->channels; c++) { yading@10: js_blocks[0] = 0; yading@10: js_blocks[1] = 0; yading@10: yading@10: get_block_sizes(ctx, div_blocks, &bs_info); yading@10: yading@10: // if joint_stereo and block_switching is set, independent decoding yading@10: // is signaled via the first bit of bs_info yading@10: if (sconf->joint_stereo && sconf->block_switching) yading@10: if (bs_info >> 31) yading@10: independent_bs = 2; yading@10: yading@10: // if this is the last channel, it has to be decoded independently yading@10: if (c == avctx->channels - 1) yading@10: independent_bs = 1; yading@10: yading@10: if (independent_bs) { yading@10: if (decode_blocks_ind(ctx, ra_frame, c, div_blocks, js_blocks)) yading@10: return -1; yading@10: yading@10: independent_bs--; yading@10: } else { yading@10: if (decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks)) yading@10: return -1; yading@10: yading@10: c++; yading@10: } yading@10: yading@10: // store carryover raw samples yading@10: memmove(ctx->raw_samples[c] - sconf->max_order, yading@10: ctx->raw_samples[c] - sconf->max_order + sconf->frame_length, yading@10: sizeof(*ctx->raw_samples[c]) * sconf->max_order); yading@10: } yading@10: } else { // multi-channel coding yading@10: ALSBlockData bd = { 0 }; yading@10: int b, ret; yading@10: int *reverted_channels = ctx->reverted_channels; yading@10: unsigned int offset = 0; yading@10: yading@10: for (c = 0; c < avctx->channels; c++) yading@10: if (ctx->chan_data[c] < ctx->chan_data_buffer) { yading@10: av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data.\n"); yading@10: return -1; yading@10: } yading@10: yading@10: memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels); yading@10: yading@10: bd.ra_block = ra_frame; yading@10: bd.prev_raw_samples = ctx->prev_raw_samples; yading@10: yading@10: get_block_sizes(ctx, div_blocks, &bs_info); yading@10: yading@10: for (b = 0; b < ctx->num_blocks; b++) { yading@10: bd.block_length = div_blocks[b]; yading@10: yading@10: for (c = 0; c < avctx->channels; c++) { yading@10: bd.const_block = ctx->const_block + c; yading@10: bd.shift_lsbs = ctx->shift_lsbs + c; yading@10: bd.opt_order = ctx->opt_order + c; yading@10: bd.store_prev_samples = ctx->store_prev_samples + c; yading@10: bd.use_ltp = ctx->use_ltp + c; yading@10: bd.ltp_lag = ctx->ltp_lag + c; yading@10: bd.ltp_gain = ctx->ltp_gain[c]; yading@10: bd.lpc_cof = ctx->lpc_cof[c]; yading@10: bd.quant_cof = ctx->quant_cof[c]; yading@10: bd.raw_samples = ctx->raw_samples[c] + offset; yading@10: bd.raw_other = NULL; yading@10: yading@10: if ((ret = read_block(ctx, &bd)) < 0) yading@10: return ret; yading@10: if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0) yading@10: return ret; yading@10: } yading@10: yading@10: for (c = 0; c < avctx->channels; c++) yading@10: if (revert_channel_correlation(ctx, &bd, ctx->chan_data, yading@10: reverted_channels, offset, c)) yading@10: return -1; yading@10: yading@10: for (c = 0; c < avctx->channels; c++) { yading@10: bd.const_block = ctx->const_block + c; yading@10: bd.shift_lsbs = ctx->shift_lsbs + c; yading@10: bd.opt_order = ctx->opt_order + c; yading@10: bd.store_prev_samples = ctx->store_prev_samples + c; yading@10: bd.use_ltp = ctx->use_ltp + c; yading@10: bd.ltp_lag = ctx->ltp_lag + c; yading@10: bd.ltp_gain = ctx->ltp_gain[c]; yading@10: bd.lpc_cof = ctx->lpc_cof[c]; yading@10: bd.quant_cof = ctx->quant_cof[c]; yading@10: bd.raw_samples = ctx->raw_samples[c] + offset; yading@10: yading@10: if ((ret = decode_block(ctx, &bd)) < 0) yading@10: return ret; yading@10: } yading@10: yading@10: memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels)); yading@10: offset += div_blocks[b]; yading@10: bd.ra_block = 0; yading@10: } yading@10: yading@10: // store carryover raw samples yading@10: for (c = 0; c < avctx->channels; c++) yading@10: memmove(ctx->raw_samples[c] - sconf->max_order, yading@10: ctx->raw_samples[c] - sconf->max_order + sconf->frame_length, yading@10: sizeof(*ctx->raw_samples[c]) * sconf->max_order); yading@10: } yading@10: yading@10: // TODO: read_diff_float_data yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Decode an ALS frame. yading@10: */ yading@10: static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, yading@10: AVPacket *avpkt) yading@10: { yading@10: ALSDecContext *ctx = avctx->priv_data; yading@10: AVFrame *frame = data; yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: const uint8_t *buffer = avpkt->data; yading@10: int buffer_size = avpkt->size; yading@10: int invalid_frame, ret; yading@10: unsigned int c, sample, ra_frame, bytes_read, shift; yading@10: yading@10: init_get_bits(&ctx->gb, buffer, buffer_size * 8); yading@10: yading@10: // In the case that the distance between random access frames is set to zero yading@10: // (sconf->ra_distance == 0) no frame is treated as a random access frame. yading@10: // For the first frame, if prediction is used, all samples used from the yading@10: // previous frame are assumed to be zero. yading@10: ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance); yading@10: yading@10: // the last frame to decode might have a different length yading@10: if (sconf->samples != 0xFFFFFFFF) yading@10: ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length, yading@10: sconf->frame_length); yading@10: else yading@10: ctx->cur_frame_length = sconf->frame_length; yading@10: yading@10: // decode the frame data yading@10: if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0) yading@10: av_log(ctx->avctx, AV_LOG_WARNING, yading@10: "Reading frame data failed. Skipping RA unit.\n"); yading@10: yading@10: ctx->frame_id++; yading@10: yading@10: /* get output buffer */ yading@10: frame->nb_samples = ctx->cur_frame_length; yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return ret; yading@10: yading@10: // transform decoded frame into output format yading@10: #define INTERLEAVE_OUTPUT(bps) \ yading@10: { \ yading@10: int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \ yading@10: shift = bps - ctx->avctx->bits_per_raw_sample; \ yading@10: if (!ctx->cs_switch) { \ yading@10: for (sample = 0; sample < ctx->cur_frame_length; sample++) \ yading@10: for (c = 0; c < avctx->channels; c++) \ yading@10: *dest++ = ctx->raw_samples[c][sample] << shift; \ yading@10: } else { \ yading@10: for (sample = 0; sample < ctx->cur_frame_length; sample++) \ yading@10: for (c = 0; c < avctx->channels; c++) \ yading@10: *dest++ = ctx->raw_samples[sconf->chan_pos[c]][sample] << shift; \ yading@10: } \ yading@10: } yading@10: yading@10: if (ctx->avctx->bits_per_raw_sample <= 16) { yading@10: INTERLEAVE_OUTPUT(16) yading@10: } else { yading@10: INTERLEAVE_OUTPUT(32) yading@10: } yading@10: yading@10: // update CRC yading@10: if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) { yading@10: int swap = HAVE_BIGENDIAN != sconf->msb_first; yading@10: yading@10: if (ctx->avctx->bits_per_raw_sample == 24) { yading@10: int32_t *src = (int32_t *)frame->data[0]; yading@10: yading@10: for (sample = 0; yading@10: sample < ctx->cur_frame_length * avctx->channels; yading@10: sample++) { yading@10: int32_t v; yading@10: yading@10: if (swap) yading@10: v = av_bswap32(src[sample]); yading@10: else yading@10: v = src[sample]; yading@10: if (!HAVE_BIGENDIAN) yading@10: v >>= 8; yading@10: yading@10: ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3); yading@10: } yading@10: } else { yading@10: uint8_t *crc_source; yading@10: yading@10: if (swap) { yading@10: if (ctx->avctx->bits_per_raw_sample <= 16) { yading@10: int16_t *src = (int16_t*) frame->data[0]; yading@10: int16_t *dest = (int16_t*) ctx->crc_buffer; yading@10: for (sample = 0; yading@10: sample < ctx->cur_frame_length * avctx->channels; yading@10: sample++) yading@10: *dest++ = av_bswap16(src[sample]); yading@10: } else { yading@10: ctx->dsp.bswap_buf((uint32_t*)ctx->crc_buffer, yading@10: (uint32_t *)frame->data[0], yading@10: ctx->cur_frame_length * avctx->channels); yading@10: } yading@10: crc_source = ctx->crc_buffer; yading@10: } else { yading@10: crc_source = frame->data[0]; yading@10: } yading@10: yading@10: ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source, yading@10: ctx->cur_frame_length * avctx->channels * yading@10: av_get_bytes_per_sample(avctx->sample_fmt)); yading@10: } yading@10: yading@10: yading@10: // check CRC sums if this is the last frame yading@10: if (ctx->cur_frame_length != sconf->frame_length && yading@10: ctx->crc_org != ctx->crc) { yading@10: av_log(avctx, AV_LOG_ERROR, "CRC error.\n"); yading@10: } yading@10: } yading@10: yading@10: *got_frame_ptr = 1; yading@10: yading@10: bytes_read = invalid_frame ? buffer_size : yading@10: (get_bits_count(&ctx->gb) + 7) >> 3; yading@10: yading@10: return bytes_read; yading@10: } yading@10: yading@10: yading@10: /** Uninitialize the ALS decoder. yading@10: */ yading@10: static av_cold int decode_end(AVCodecContext *avctx) yading@10: { yading@10: ALSDecContext *ctx = avctx->priv_data; yading@10: yading@10: av_freep(&ctx->sconf.chan_pos); yading@10: yading@10: ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status); yading@10: yading@10: av_freep(&ctx->const_block); yading@10: av_freep(&ctx->shift_lsbs); yading@10: av_freep(&ctx->opt_order); yading@10: av_freep(&ctx->store_prev_samples); yading@10: av_freep(&ctx->use_ltp); yading@10: av_freep(&ctx->ltp_lag); yading@10: av_freep(&ctx->ltp_gain); yading@10: av_freep(&ctx->ltp_gain_buffer); yading@10: av_freep(&ctx->quant_cof); yading@10: av_freep(&ctx->lpc_cof); yading@10: av_freep(&ctx->quant_cof_buffer); yading@10: av_freep(&ctx->lpc_cof_buffer); yading@10: av_freep(&ctx->lpc_cof_reversed_buffer); yading@10: av_freep(&ctx->prev_raw_samples); yading@10: av_freep(&ctx->raw_samples); yading@10: av_freep(&ctx->raw_buffer); yading@10: av_freep(&ctx->chan_data); yading@10: av_freep(&ctx->chan_data_buffer); yading@10: av_freep(&ctx->reverted_channels); yading@10: av_freep(&ctx->crc_buffer); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Initialize the ALS decoder. yading@10: */ yading@10: static av_cold int decode_init(AVCodecContext *avctx) yading@10: { yading@10: unsigned int c; yading@10: unsigned int channel_size; yading@10: int num_buffers; yading@10: ALSDecContext *ctx = avctx->priv_data; yading@10: ALSSpecificConfig *sconf = &ctx->sconf; yading@10: ctx->avctx = avctx; yading@10: yading@10: if (!avctx->extradata) { yading@10: av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n"); yading@10: return -1; yading@10: } yading@10: yading@10: if (read_specific_config(ctx)) { yading@10: av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n"); yading@10: decode_end(avctx); yading@10: return -1; yading@10: } yading@10: yading@10: if (check_specific_config(ctx)) { yading@10: decode_end(avctx); yading@10: return -1; yading@10: } yading@10: yading@10: if (sconf->bgmc) yading@10: ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status); yading@10: yading@10: if (sconf->floating) { yading@10: avctx->sample_fmt = AV_SAMPLE_FMT_FLT; yading@10: avctx->bits_per_raw_sample = 32; yading@10: } else { yading@10: avctx->sample_fmt = sconf->resolution > 1 yading@10: ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16; yading@10: avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8; yading@10: } yading@10: yading@10: // set maximum Rice parameter for progressive decoding based on resolution yading@10: // This is not specified in 14496-3 but actually done by the reference yading@10: // codec RM22 revision 2. yading@10: ctx->s_max = sconf->resolution > 1 ? 31 : 15; yading@10: yading@10: // set lag value for long-term prediction yading@10: ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) + yading@10: (avctx->sample_rate >= 192000); yading@10: yading@10: // allocate quantized parcor coefficient buffer yading@10: num_buffers = sconf->mc_coding ? avctx->channels : 1; yading@10: yading@10: ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers); yading@10: ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers); yading@10: ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) * yading@10: num_buffers * sconf->max_order); yading@10: ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) * yading@10: num_buffers * sconf->max_order); yading@10: ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) * yading@10: sconf->max_order); yading@10: yading@10: if (!ctx->quant_cof || !ctx->lpc_cof || yading@10: !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer || yading@10: !ctx->lpc_cof_reversed_buffer) { yading@10: av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: yading@10: // assign quantized parcor coefficient buffers yading@10: for (c = 0; c < num_buffers; c++) { yading@10: ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order; yading@10: ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order; yading@10: } yading@10: yading@10: // allocate and assign lag and gain data buffer for ltp mode yading@10: ctx->const_block = av_malloc (sizeof(*ctx->const_block) * num_buffers); yading@10: ctx->shift_lsbs = av_malloc (sizeof(*ctx->shift_lsbs) * num_buffers); yading@10: ctx->opt_order = av_malloc (sizeof(*ctx->opt_order) * num_buffers); yading@10: ctx->store_prev_samples = av_malloc(sizeof(*ctx->store_prev_samples) * num_buffers); yading@10: ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers); yading@10: ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers); yading@10: ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers); yading@10: ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) * yading@10: num_buffers * 5); yading@10: yading@10: if (!ctx->const_block || !ctx->shift_lsbs || yading@10: !ctx->opt_order || !ctx->store_prev_samples || yading@10: !ctx->use_ltp || !ctx->ltp_lag || yading@10: !ctx->ltp_gain || !ctx->ltp_gain_buffer) { yading@10: av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); yading@10: decode_end(avctx); yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: yading@10: for (c = 0; c < num_buffers; c++) yading@10: ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5; yading@10: yading@10: // allocate and assign channel data buffer for mcc mode yading@10: if (sconf->mc_coding) { yading@10: ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) * yading@10: num_buffers * num_buffers); yading@10: ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) * yading@10: num_buffers); yading@10: ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) * yading@10: num_buffers); yading@10: yading@10: if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) { yading@10: av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); yading@10: decode_end(avctx); yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: yading@10: for (c = 0; c < num_buffers; c++) yading@10: ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers; yading@10: } else { yading@10: ctx->chan_data = NULL; yading@10: ctx->chan_data_buffer = NULL; yading@10: ctx->reverted_channels = NULL; yading@10: } yading@10: yading@10: channel_size = sconf->frame_length + sconf->max_order; yading@10: yading@10: ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order); yading@10: ctx->raw_buffer = av_mallocz(sizeof(*ctx-> raw_buffer) * avctx->channels * channel_size); yading@10: ctx->raw_samples = av_malloc (sizeof(*ctx-> raw_samples) * avctx->channels); yading@10: yading@10: // allocate previous raw sample buffer yading@10: if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) { yading@10: av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); yading@10: decode_end(avctx); yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: yading@10: // assign raw samples buffers yading@10: ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order; yading@10: for (c = 1; c < avctx->channels; c++) yading@10: ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size; yading@10: yading@10: // allocate crc buffer yading@10: if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled && yading@10: (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) { yading@10: ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) * yading@10: ctx->cur_frame_length * yading@10: avctx->channels * yading@10: av_get_bytes_per_sample(avctx->sample_fmt)); yading@10: if (!ctx->crc_buffer) { yading@10: av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); yading@10: decode_end(avctx); yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: } yading@10: yading@10: ff_dsputil_init(&ctx->dsp, avctx); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** Flush (reset) the frame ID after seeking. yading@10: */ yading@10: static av_cold void flush(AVCodecContext *avctx) yading@10: { yading@10: ALSDecContext *ctx = avctx->priv_data; yading@10: yading@10: ctx->frame_id = 0; yading@10: } yading@10: yading@10: yading@10: AVCodec ff_als_decoder = { yading@10: .name = "als", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_MP4ALS, yading@10: .priv_data_size = sizeof(ALSDecContext), yading@10: .init = decode_init, yading@10: .close = decode_end, yading@10: .decode = decode_frame, yading@10: .flush = flush, yading@10: .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"), yading@10: };