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Diffstat (limited to 'ffmpeg1/libavcodec/alsdec.c')
| -rw-r--r-- | ffmpeg1/libavcodec/alsdec.c | 1786 |
1 files changed, 0 insertions, 1786 deletions
diff --git a/ffmpeg1/libavcodec/alsdec.c b/ffmpeg1/libavcodec/alsdec.c deleted file mode 100644 index 96d467c..0000000 --- a/ffmpeg1/libavcodec/alsdec.c +++ /dev/null @@ -1,1786 +0,0 @@ -/* - * MPEG-4 ALS decoder - * Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ googlemail.com> - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * MPEG-4 ALS decoder - * @author Thilo Borgmann <thilo.borgmann _at_ googlemail.com> - */ - - -//#define DEBUG - - -#include "avcodec.h" -#include "get_bits.h" -#include "unary.h" -#include "mpeg4audio.h" -#include "bytestream.h" -#include "bgmc.h" -#include "dsputil.h" -#include "internal.h" -#include "libavutil/samplefmt.h" -#include "libavutil/crc.h" - -#include <stdint.h> - -/** Rice parameters and corresponding index offsets for decoding the - * indices of scaled PARCOR values. The table chosen is set globally - * by the encoder and stored in ALSSpecificConfig. - */ -static const int8_t parcor_rice_table[3][20][2] = { - { {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4}, - { 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3}, - { -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2}, - { 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} }, - { {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4}, - { 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4}, - {-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4}, - { 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} }, - { {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4}, - { 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3}, - {-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3}, - { 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} } -}; - - -/** Scaled PARCOR values used for the first two PARCOR coefficients. - * To be indexed by the Rice coded indices. - * Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20) - * Actual values are divided by 32 in order to be stored in 16 bits. - */ -static const int16_t parcor_scaled_values[] = { - -1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32, - -1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32, - -1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32, - -1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32, - -1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32, - -994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32, - -971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32, - -944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32, - -913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32, - -878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32, - -838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32, - -795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32, - -747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32, - -695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32, - -639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32, - -580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32, - -516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32, - -447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32, - -375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32, - -299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32, - -219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32, - -134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32, - -46048 / 32, -23264 / 32, -224 / 32, 23072 / 32, - 46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32, - 143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32, - 244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32, - 349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32, - 458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32, - 571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32, - 688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32, - 810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32, - 935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32 -}; - - -/** Gain values of p(0) for long-term prediction. - * To be indexed by the Rice coded indices. - */ -static const uint8_t ltp_gain_values [4][4] = { - { 0, 8, 16, 24}, - {32, 40, 48, 56}, - {64, 70, 76, 82}, - {88, 92, 96, 100} -}; - - -/** Inter-channel weighting factors for multi-channel correlation. - * To be indexed by the Rice coded indices. - */ -static const int16_t mcc_weightings[] = { - 204, 192, 179, 166, 153, 140, 128, 115, - 102, 89, 76, 64, 51, 38, 25, 12, - 0, -12, -25, -38, -51, -64, -76, -89, - -102, -115, -128, -140, -153, -166, -179, -192 -}; - - -/** Tail codes used in arithmetic coding using block Gilbert-Moore codes. - */ -static const uint8_t tail_code[16][6] = { - { 74, 44, 25, 13, 7, 3}, - { 68, 42, 24, 13, 7, 3}, - { 58, 39, 23, 13, 7, 3}, - {126, 70, 37, 19, 10, 5}, - {132, 70, 37, 20, 10, 5}, - {124, 70, 38, 20, 10, 5}, - {120, 69, 37, 20, 11, 5}, - {116, 67, 37, 20, 11, 5}, - {108, 66, 36, 20, 10, 5}, - {102, 62, 36, 20, 10, 5}, - { 88, 58, 34, 19, 10, 5}, - {162, 89, 49, 25, 13, 7}, - {156, 87, 49, 26, 14, 7}, - {150, 86, 47, 26, 14, 7}, - {142, 84, 47, 26, 14, 7}, - {131, 79, 46, 26, 14, 7} -}; - - -enum RA_Flag { - RA_FLAG_NONE, - RA_FLAG_FRAMES, - RA_FLAG_HEADER -}; - - -typedef struct { - uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown - int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit - int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer - int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian - int frame_length; ///< frame length for each frame (last frame may differ) - int ra_distance; ///< distance between RA frames (in frames, 0...255) - enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored - int adapt_order; ///< adaptive order: 1 = on, 0 = off - int coef_table; ///< table index of Rice code parameters - int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off - int max_order; ///< maximum prediction order (0..1023) - int block_switching; ///< number of block switching levels - int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only) - int sb_part; ///< sub-block partition - int joint_stereo; ///< joint stereo: 1 = on, 0 = off - int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off - int chan_config; ///< indicates that a chan_config_info field is present - int chan_sort; ///< channel rearrangement: 1 = on, 0 = off - int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off - int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented. - int *chan_pos; ///< original channel positions - int crc_enabled; ///< enable Cyclic Redundancy Checksum -} ALSSpecificConfig; - - -typedef struct { - int stop_flag; - int master_channel; - int time_diff_flag; - int time_diff_sign; - int time_diff_index; - int weighting[6]; -} ALSChannelData; - - -typedef struct { - AVCodecContext *avctx; - ALSSpecificConfig sconf; - GetBitContext gb; - DSPContext dsp; - const AVCRC *crc_table; - uint32_t crc_org; ///< CRC value of the original input data - uint32_t crc; ///< CRC value calculated from decoded data - unsigned int cur_frame_length; ///< length of the current frame to decode - unsigned int frame_id; ///< the frame ID / number of the current frame - unsigned int js_switch; ///< if true, joint-stereo decoding is enforced - unsigned int cs_switch; ///< if true, channel rearrangement is done - unsigned int num_blocks; ///< number of blocks used in the current frame - unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding - uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC - int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC - int ltp_lag_length; ///< number of bits used for ltp lag value - int *const_block; ///< contains const_block flags for all channels - unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels - unsigned int *opt_order; ///< contains opt_order flags for all channels - int *store_prev_samples; ///< contains store_prev_samples flags for all channels - int *use_ltp; ///< contains use_ltp flags for all channels - int *ltp_lag; ///< contains ltp lag values for all channels - int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel - int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter - int32_t **quant_cof; ///< quantized parcor coefficients for a channel - int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients - int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel - int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter - int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer - ALSChannelData **chan_data; ///< channel data for multi-channel correlation - ALSChannelData *chan_data_buffer; ///< contains channel data for all channels - int *reverted_channels; ///< stores a flag for each reverted channel - int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block - int32_t **raw_samples; ///< decoded raw samples for each channel - int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples - uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check -} ALSDecContext; - - -typedef struct { - unsigned int block_length; ///< number of samples within the block - unsigned int ra_block; ///< if true, this is a random access block - int *const_block; ///< if true, this is a constant value block - int js_blocks; ///< true if this block contains a difference signal - unsigned int *shift_lsbs; ///< shift of values for this block - unsigned int *opt_order; ///< prediction order of this block - int *store_prev_samples;///< if true, carryover samples have to be stored - int *use_ltp; ///< if true, long-term prediction is used - int *ltp_lag; ///< lag value for long-term prediction - int *ltp_gain; ///< gain values for ltp 5-tap filter - int32_t *quant_cof; ///< quantized parcor coefficients - int32_t *lpc_cof; ///< coefficients of the direct form prediction - int32_t *raw_samples; ///< decoded raw samples / residuals for this block - int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block - int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair -} ALSBlockData; - - -static av_cold void dprint_specific_config(ALSDecContext *ctx) -{ -#ifdef DEBUG - AVCodecContext *avctx = ctx->avctx; - ALSSpecificConfig *sconf = &ctx->sconf; - - av_dlog(avctx, "resolution = %i\n", sconf->resolution); - av_dlog(avctx, "floating = %i\n", sconf->floating); - av_dlog(avctx, "frame_length = %i\n", sconf->frame_length); - av_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance); - av_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag); - av_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order); - av_dlog(avctx, "coef_table = %i\n", sconf->coef_table); - av_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction); - av_dlog(avctx, "max_order = %i\n", sconf->max_order); - av_dlog(avctx, "block_switching = %i\n", sconf->block_switching); - av_dlog(avctx, "bgmc = %i\n", sconf->bgmc); - av_dlog(avctx, "sb_part = %i\n", sconf->sb_part); - av_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo); - av_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding); - av_dlog(avctx, "chan_config = %i\n", sconf->chan_config); - av_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort); - av_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms); - av_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info); -#endif -} - - -/** Read an ALSSpecificConfig from a buffer into the output struct. - */ -static av_cold int read_specific_config(ALSDecContext *ctx) -{ - GetBitContext gb; - uint64_t ht_size; - int i, config_offset; - MPEG4AudioConfig m4ac; - ALSSpecificConfig *sconf = &ctx->sconf; - AVCodecContext *avctx = ctx->avctx; - uint32_t als_id, header_size, trailer_size; - int ret; - - if ((ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size)) < 0) - return ret; - - config_offset = avpriv_mpeg4audio_get_config(&m4ac, avctx->extradata, - avctx->extradata_size * 8, 1); - - if (config_offset < 0) - return -1; - - skip_bits_long(&gb, config_offset); - - if (get_bits_left(&gb) < (30 << 3)) - return -1; - - // read the fixed items - als_id = get_bits_long(&gb, 32); - avctx->sample_rate = m4ac.sample_rate; - skip_bits_long(&gb, 32); // sample rate already known - sconf->samples = get_bits_long(&gb, 32); - avctx->channels = m4ac.channels; - skip_bits(&gb, 16); // number of channels already known - skip_bits(&gb, 3); // skip file_type - sconf->resolution = get_bits(&gb, 3); - sconf->floating = get_bits1(&gb); - sconf->msb_first = get_bits1(&gb); - sconf->frame_length = get_bits(&gb, 16) + 1; - sconf->ra_distance = get_bits(&gb, 8); - sconf->ra_flag = get_bits(&gb, 2); - sconf->adapt_order = get_bits1(&gb); - sconf->coef_table = get_bits(&gb, 2); - sconf->long_term_prediction = get_bits1(&gb); - sconf->max_order = get_bits(&gb, 10); - sconf->block_switching = get_bits(&gb, 2); - sconf->bgmc = get_bits1(&gb); - sconf->sb_part = get_bits1(&gb); - sconf->joint_stereo = get_bits1(&gb); - sconf->mc_coding = get_bits1(&gb); - sconf->chan_config = get_bits1(&gb); - sconf->chan_sort = get_bits1(&gb); - sconf->crc_enabled = get_bits1(&gb); - sconf->rlslms = get_bits1(&gb); - skip_bits(&gb, 5); // skip 5 reserved bits - skip_bits1(&gb); // skip aux_data_enabled - - - // check for ALSSpecificConfig struct - if (als_id != MKBETAG('A','L','S','\0')) - return -1; - - ctx->cur_frame_length = sconf->frame_length; - - // read channel config - if (sconf->chan_config) - sconf->chan_config_info = get_bits(&gb, 16); - // TODO: use this to set avctx->channel_layout - - - // read channel sorting - if (sconf->chan_sort && avctx->channels > 1) { - int chan_pos_bits = av_ceil_log2(avctx->channels); - int bits_needed = avctx->channels * chan_pos_bits + 7; - if (get_bits_left(&gb) < bits_needed) - return -1; - - if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos)))) - return AVERROR(ENOMEM); - - ctx->cs_switch = 1; - - for (i = 0; i < avctx->channels; i++) { - int idx; - - idx = get_bits(&gb, chan_pos_bits); - if (idx >= avctx->channels) { - av_log(avctx, AV_LOG_WARNING, "Invalid channel reordering.\n"); - ctx->cs_switch = 0; - break; - } - sconf->chan_pos[idx] = i; - } - - align_get_bits(&gb); - } - - - // read fixed header and trailer sizes, - // if size = 0xFFFFFFFF then there is no data field! - if (get_bits_left(&gb) < 64) - return -1; - - header_size = get_bits_long(&gb, 32); - trailer_size = get_bits_long(&gb, 32); - if (header_size == 0xFFFFFFFF) - header_size = 0; - if (trailer_size == 0xFFFFFFFF) - trailer_size = 0; - - ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3; - - - // skip the header and trailer data - if (get_bits_left(&gb) < ht_size) - return -1; - - if (ht_size > INT32_MAX) - return -1; - - skip_bits_long(&gb, ht_size); - - - // initialize CRC calculation - if (sconf->crc_enabled) { - if (get_bits_left(&gb) < 32) - return -1; - - if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) { - ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE); - ctx->crc = 0xFFFFFFFF; - ctx->crc_org = ~get_bits_long(&gb, 32); - } else - skip_bits_long(&gb, 32); - } - - - // no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data) - - dprint_specific_config(ctx); - - return 0; -} - - -/** Check the ALSSpecificConfig for unsupported features. - */ -static int check_specific_config(ALSDecContext *ctx) -{ - ALSSpecificConfig *sconf = &ctx->sconf; - int error = 0; - - // report unsupported feature and set error value - #define MISSING_ERR(cond, str, errval) \ - { \ - if (cond) { \ - avpriv_report_missing_feature(ctx->avctx, \ - str); \ - error = errval; \ - } \ - } - - MISSING_ERR(sconf->floating, "Floating point decoding", AVERROR_PATCHWELCOME); - MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", AVERROR_PATCHWELCOME); - - return error; -} - - -/** Parse the bs_info field to extract the block partitioning used in - * block switching mode, refer to ISO/IEC 14496-3, section 11.6.2. - */ -static void parse_bs_info(const uint32_t bs_info, unsigned int n, - unsigned int div, unsigned int **div_blocks, - unsigned int *num_blocks) -{ - if (n < 31 && ((bs_info << n) & 0x40000000)) { - // if the level is valid and the investigated bit n is set - // then recursively check both children at bits (2n+1) and (2n+2) - n *= 2; - div += 1; - parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks); - parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks); - } else { - // else the bit is not set or the last level has been reached - // (bit implicitly not set) - **div_blocks = div; - (*div_blocks)++; - (*num_blocks)++; - } -} - - -/** Read and decode a Rice codeword. - */ -static int32_t decode_rice(GetBitContext *gb, unsigned int k) -{ - int max = get_bits_left(gb) - k; - int q = get_unary(gb, 0, max); - int r = k ? get_bits1(gb) : !(q & 1); - - if (k > 1) { - q <<= (k - 1); - q += get_bits_long(gb, k - 1); - } else if (!k) { - q >>= 1; - } - return r ? q : ~q; -} - - -/** Convert PARCOR coefficient k to direct filter coefficient. - */ -static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof) -{ - int i, j; - - for (i = 0, j = k - 1; i < j; i++, j--) { - int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20); - cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20); - cof[i] += tmp1; - } - if (i == j) - cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20); - - cof[k] = par[k]; -} - - -/** Read block switching field if necessary and set actual block sizes. - * Also assure that the block sizes of the last frame correspond to the - * actual number of samples. - */ -static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks, - uint32_t *bs_info) -{ - ALSSpecificConfig *sconf = &ctx->sconf; - GetBitContext *gb = &ctx->gb; - unsigned int *ptr_div_blocks = div_blocks; - unsigned int b; - - if (sconf->block_switching) { - unsigned int bs_info_len = 1 << (sconf->block_switching + 2); - *bs_info = get_bits_long(gb, bs_info_len); - *bs_info <<= (32 - bs_info_len); - } - - ctx->num_blocks = 0; - parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks); - - // The last frame may have an overdetermined block structure given in - // the bitstream. In that case the defined block structure would need - // more samples than available to be consistent. - // The block structure is actually used but the block sizes are adapted - // to fit the actual number of available samples. - // Example: 5 samples, 2nd level block sizes: 2 2 2 2. - // This results in the actual block sizes: 2 2 1 0. - // This is not specified in 14496-3 but actually done by the reference - // codec RM22 revision 2. - // This appears to happen in case of an odd number of samples in the last - // frame which is actually not allowed by the block length switching part - // of 14496-3. - // The ALS conformance files feature an odd number of samples in the last - // frame. - - for (b = 0; b < ctx->num_blocks; b++) - div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b]; - - if (ctx->cur_frame_length != ctx->sconf.frame_length) { - unsigned int remaining = ctx->cur_frame_length; - - for (b = 0; b < ctx->num_blocks; b++) { - if (remaining <= div_blocks[b]) { - div_blocks[b] = remaining; - ctx->num_blocks = b + 1; - break; - } - - remaining -= div_blocks[b]; - } - } -} - - -/** Read the block data for a constant block - */ -static int read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd) -{ - ALSSpecificConfig *sconf = &ctx->sconf; - AVCodecContext *avctx = ctx->avctx; - GetBitContext *gb = &ctx->gb; - - if (bd->block_length <= 0) - return AVERROR_INVALIDDATA; - - *bd->raw_samples = 0; - *bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence) - bd->js_blocks = get_bits1(gb); - - // skip 5 reserved bits - skip_bits(gb, 5); - - if (*bd->const_block) { - unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample; - *bd->raw_samples = get_sbits_long(gb, const_val_bits); - } - - // ensure constant block decoding by reusing this field - *bd->const_block = 1; - - return 0; -} - - -/** Decode the block data for a constant block - */ -static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd) -{ - int smp = bd->block_length - 1; - int32_t val = *bd->raw_samples; - int32_t *dst = bd->raw_samples + 1; - - // write raw samples into buffer - for (; smp; smp--) - *dst++ = val; -} - - -/** Read the block data for a non-constant block - */ -static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd) -{ - ALSSpecificConfig *sconf = &ctx->sconf; - AVCodecContext *avctx = ctx->avctx; - GetBitContext *gb = &ctx->gb; - unsigned int k; - unsigned int s[8]; - unsigned int sx[8]; - unsigned int sub_blocks, log2_sub_blocks, sb_length; - unsigned int start = 0; - unsigned int opt_order; - int sb; - int32_t *quant_cof = bd->quant_cof; - int32_t *current_res; - - - // ensure variable block decoding by reusing this field - *bd->const_block = 0; - - *bd->opt_order = 1; - bd->js_blocks = get_bits1(gb); - - opt_order = *bd->opt_order; - - // determine the number of subblocks for entropy decoding - if (!sconf->bgmc && !sconf->sb_part) { - log2_sub_blocks = 0; - } else { - if (sconf->bgmc && sconf->sb_part) - log2_sub_blocks = get_bits(gb, 2); - else - log2_sub_blocks = 2 * get_bits1(gb); - } - - sub_blocks = 1 << log2_sub_blocks; - - // do not continue in case of a damaged stream since - // block_length must be evenly divisible by sub_blocks - if (bd->block_length & (sub_blocks - 1)) { - av_log(avctx, AV_LOG_WARNING, - "Block length is not evenly divisible by the number of subblocks.\n"); - return -1; - } - - sb_length = bd->block_length >> log2_sub_blocks; - - if (sconf->bgmc) { - s[0] = get_bits(gb, 8 + (sconf->resolution > 1)); - for (k = 1; k < sub_blocks; k++) - s[k] = s[k - 1] + decode_rice(gb, 2); - - for (k = 0; k < sub_blocks; k++) { - sx[k] = s[k] & 0x0F; - s [k] >>= 4; - } - } else { - s[0] = get_bits(gb, 4 + (sconf->resolution > 1)); - for (k = 1; k < sub_blocks; k++) - s[k] = s[k - 1] + decode_rice(gb, 0); - } - for (k = 1; k < sub_blocks; k++) - if (s[k] > 32) { - av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n"); - return AVERROR_INVALIDDATA; - } - - if (get_bits1(gb)) - *bd->shift_lsbs = get_bits(gb, 4) + 1; - - *bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs; - - - if (!sconf->rlslms) { - if (sconf->adapt_order) { - int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1, - 2, sconf->max_order + 1)); - *bd->opt_order = get_bits(gb, opt_order_length); - if (*bd->opt_order > sconf->max_order) { - *bd->opt_order = sconf->max_order; - av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n"); - return AVERROR_INVALIDDATA; - } - } else { - *bd->opt_order = sconf->max_order; - } - - opt_order = *bd->opt_order; - - if (opt_order) { - int add_base; - - if (sconf->coef_table == 3) { - add_base = 0x7F; - - // read coefficient 0 - quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)]; - - // read coefficient 1 - if (opt_order > 1) - quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)]; - - // read coefficients 2 to opt_order - for (k = 2; k < opt_order; k++) - quant_cof[k] = get_bits(gb, 7); - } else { - int k_max; - add_base = 1; - - // read coefficient 0 to 19 - k_max = FFMIN(opt_order, 20); - for (k = 0; k < k_max; k++) { - int rice_param = parcor_rice_table[sconf->coef_table][k][1]; - int offset = parcor_rice_table[sconf->coef_table][k][0]; - quant_cof[k] = decode_rice(gb, rice_param) + offset; - if (quant_cof[k] < -64 || quant_cof[k] > 63) { - av_log(avctx, AV_LOG_ERROR, "quant_cof %d is out of range.\n", quant_cof[k]); - return AVERROR_INVALIDDATA; - } - } - - // read coefficients 20 to 126 - k_max = FFMIN(opt_order, 127); - for (; k < k_max; k++) - quant_cof[k] = decode_rice(gb, 2) + (k & 1); - - // read coefficients 127 to opt_order - for (; k < opt_order; k++) - quant_cof[k] = decode_rice(gb, 1); - - quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64]; - - if (opt_order > 1) - quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64]; - } - - for (k = 2; k < opt_order; k++) - quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13); - } - } - - // read LTP gain and lag values - if (sconf->long_term_prediction) { - *bd->use_ltp = get_bits1(gb); - - if (*bd->use_ltp) { - int r, c; - - bd->ltp_gain[0] = decode_rice(gb, 1) << 3; - bd->ltp_gain[1] = decode_rice(gb, 2) << 3; - - r = get_unary(gb, 0, 3); - c = get_bits(gb, 2); - bd->ltp_gain[2] = ltp_gain_values[r][c]; - - bd->ltp_gain[3] = decode_rice(gb, 2) << 3; - bd->ltp_gain[4] = decode_rice(gb, 1) << 3; - - *bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length); - *bd->ltp_lag += FFMAX(4, opt_order + 1); - } - } - - // read first value and residuals in case of a random access block - if (bd->ra_block) { - if (opt_order) - bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4); - if (opt_order > 1) - bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max)); - if (opt_order > 2) - bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max)); - - start = FFMIN(opt_order, 3); - } - - // read all residuals - if (sconf->bgmc) { - int delta[8]; - unsigned int k [8]; - unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5); - - // read most significant bits - unsigned int high; - unsigned int low; - unsigned int value; - - ff_bgmc_decode_init(gb, &high, &low, &value); - - current_res = bd->raw_samples + start; - - for (sb = 0; sb < sub_blocks; sb++) { - unsigned int sb_len = sb_length - (sb ? 0 : start); - - k [sb] = s[sb] > b ? s[sb] - b : 0; - delta[sb] = 5 - s[sb] + k[sb]; - - ff_bgmc_decode(gb, sb_len, current_res, - delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status); - - current_res += sb_len; - } - - ff_bgmc_decode_end(gb); - - - // read least significant bits and tails - current_res = bd->raw_samples + start; - - for (sb = 0; sb < sub_blocks; sb++, start = 0) { - unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]]; - unsigned int cur_k = k[sb]; - unsigned int cur_s = s[sb]; - - for (; start < sb_length; start++) { - int32_t res = *current_res; - - if (res == cur_tail_code) { - unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10)) - << (5 - delta[sb]); - - res = decode_rice(gb, cur_s); - - if (res >= 0) { - res += (max_msb ) << cur_k; - } else { - res -= (max_msb - 1) << cur_k; - } - } else { - if (res > cur_tail_code) - res--; - - if (res & 1) - res = -res; - - res >>= 1; - - if (cur_k) { - res <<= cur_k; - res |= get_bits_long(gb, cur_k); - } - } - - *current_res++ = res; - } - } - } else { - current_res = bd->raw_samples + start; - - for (sb = 0; sb < sub_blocks; sb++, start = 0) - for (; start < sb_length; start++) - *current_res++ = decode_rice(gb, s[sb]); - } - - if (!sconf->mc_coding || ctx->js_switch) - align_get_bits(gb); - - return 0; -} - - -/** Decode the block data for a non-constant block - */ -static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd) -{ - ALSSpecificConfig *sconf = &ctx->sconf; - unsigned int block_length = bd->block_length; - unsigned int smp = 0; - unsigned int k; - int opt_order = *bd->opt_order; - int sb; - int64_t y; - int32_t *quant_cof = bd->quant_cof; - int32_t *lpc_cof = bd->lpc_cof; - int32_t *raw_samples = bd->raw_samples; - int32_t *raw_samples_end = bd->raw_samples + bd->block_length; - int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer; - - // reverse long-term prediction - if (*bd->use_ltp) { - int ltp_smp; - - for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) { - int center = ltp_smp - *bd->ltp_lag; - int begin = FFMAX(0, center - 2); - int end = center + 3; - int tab = 5 - (end - begin); - int base; - - y = 1 << 6; - - for (base = begin; base < end; base++, tab++) - y += MUL64(bd->ltp_gain[tab], raw_samples[base]); - - raw_samples[ltp_smp] += y >> 7; - } - } - - // reconstruct all samples from residuals - if (bd->ra_block) { - for (smp = 0; smp < opt_order; smp++) { - y = 1 << 19; - - for (sb = 0; sb < smp; sb++) - y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]); - - *raw_samples++ -= y >> 20; - parcor_to_lpc(smp, quant_cof, lpc_cof); - } - } else { - for (k = 0; k < opt_order; k++) - parcor_to_lpc(k, quant_cof, lpc_cof); - - // store previous samples in case that they have to be altered - if (*bd->store_prev_samples) - memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order, - sizeof(*bd->prev_raw_samples) * sconf->max_order); - - // reconstruct difference signal for prediction (joint-stereo) - if (bd->js_blocks && bd->raw_other) { - int32_t *left, *right; - - if (bd->raw_other > raw_samples) { // D = R - L - left = raw_samples; - right = bd->raw_other; - } else { // D = R - L - left = bd->raw_other; - right = raw_samples; - } - - for (sb = -1; sb >= -sconf->max_order; sb--) - raw_samples[sb] = right[sb] - left[sb]; - } - - // reconstruct shifted signal - if (*bd->shift_lsbs) - for (sb = -1; sb >= -sconf->max_order; sb--) - raw_samples[sb] >>= *bd->shift_lsbs; - } - - // reverse linear prediction coefficients for efficiency - lpc_cof = lpc_cof + opt_order; - - for (sb = 0; sb < opt_order; sb++) - lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)]; - - // reconstruct raw samples - raw_samples = bd->raw_samples + smp; - lpc_cof = lpc_cof_reversed + opt_order; - - for (; raw_samples < raw_samples_end; raw_samples++) { - y = 1 << 19; - - for (sb = -opt_order; sb < 0; sb++) - y += MUL64(lpc_cof[sb], raw_samples[sb]); - - *raw_samples -= y >> 20; - } - - raw_samples = bd->raw_samples; - - // restore previous samples in case that they have been altered - if (*bd->store_prev_samples) - memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples, - sizeof(*raw_samples) * sconf->max_order); - - return 0; -} - - -/** Read the block data. - */ -static int read_block(ALSDecContext *ctx, ALSBlockData *bd) -{ - GetBitContext *gb = &ctx->gb; - int ret; - - *bd->shift_lsbs = 0; - // read block type flag and read the samples accordingly - if (get_bits1(gb)) { - if ((ret = read_var_block_data(ctx, bd)) < 0) - return ret; - } else { - if ((ret = read_const_block_data(ctx, bd)) < 0) - return ret; - } - - return 0; -} - - -/** Decode the block data. - */ -static int decode_block(ALSDecContext *ctx, ALSBlockData *bd) -{ - unsigned int smp; - - // read block type flag and read the samples accordingly - if (*bd->const_block) - decode_const_block_data(ctx, bd); - else if (decode_var_block_data(ctx, bd)) - return -1; - - // TODO: read RLSLMS extension data - - if (*bd->shift_lsbs) - for (smp = 0; smp < bd->block_length; smp++) - bd->raw_samples[smp] <<= *bd->shift_lsbs; - - return 0; -} - - -/** Read and decode block data successively. - */ -static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd) -{ - int ret; - - ret = read_block(ctx, bd); - - if (ret) - return ret; - - ret = decode_block(ctx, bd); - - return ret; -} - - -/** Compute the number of samples left to decode for the current frame and - * sets these samples to zero. - */ -static void zero_remaining(unsigned int b, unsigned int b_max, - const unsigned int *div_blocks, int32_t *buf) -{ - unsigned int count = 0; - - while (b < b_max) - count += div_blocks[b++]; - - if (count) - memset(buf, 0, sizeof(*buf) * count); -} - - -/** Decode blocks independently. - */ -static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame, - unsigned int c, const unsigned int *div_blocks, - unsigned int *js_blocks) -{ - unsigned int b; - ALSBlockData bd = { 0 }; - - bd.ra_block = ra_frame; - bd.const_block = ctx->const_block; - bd.shift_lsbs = ctx->shift_lsbs; - bd.opt_order = ctx->opt_order; - bd.store_prev_samples = ctx->store_prev_samples; - bd.use_ltp = ctx->use_ltp; - bd.ltp_lag = ctx->ltp_lag; - bd.ltp_gain = ctx->ltp_gain[0]; - bd.quant_cof = ctx->quant_cof[0]; - bd.lpc_cof = ctx->lpc_cof[0]; - bd.prev_raw_samples = ctx->prev_raw_samples; - bd.raw_samples = ctx->raw_samples[c]; - - - for (b = 0; b < ctx->num_blocks; b++) { - bd.block_length = div_blocks[b]; - - if (read_decode_block(ctx, &bd)) { - // damaged block, write zero for the rest of the frame - zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples); - return -1; - } - bd.raw_samples += div_blocks[b]; - bd.ra_block = 0; - } - - return 0; -} - - -/** Decode blocks dependently. - */ -static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame, - unsigned int c, const unsigned int *div_blocks, - unsigned int *js_blocks) -{ - ALSSpecificConfig *sconf = &ctx->sconf; - unsigned int offset = 0; - unsigned int b; - ALSBlockData bd[2] = { { 0 } }; - - bd[0].ra_block = ra_frame; - bd[0].const_block = ctx->const_block; - bd[0].shift_lsbs = ctx->shift_lsbs; - bd[0].opt_order = ctx->opt_order; - bd[0].store_prev_samples = ctx->store_prev_samples; - bd[0].use_ltp = ctx->use_ltp; - bd[0].ltp_lag = ctx->ltp_lag; - bd[0].ltp_gain = ctx->ltp_gain[0]; - bd[0].quant_cof = ctx->quant_cof[0]; - bd[0].lpc_cof = ctx->lpc_cof[0]; - bd[0].prev_raw_samples = ctx->prev_raw_samples; - bd[0].js_blocks = *js_blocks; - - bd[1].ra_block = ra_frame; - bd[1].const_block = ctx->const_block; - bd[1].shift_lsbs = ctx->shift_lsbs; - bd[1].opt_order = ctx->opt_order; - bd[1].store_prev_samples = ctx->store_prev_samples; - bd[1].use_ltp = ctx->use_ltp; - bd[1].ltp_lag = ctx->ltp_lag; - bd[1].ltp_gain = ctx->ltp_gain[0]; - bd[1].quant_cof = ctx->quant_cof[0]; - bd[1].lpc_cof = ctx->lpc_cof[0]; - bd[1].prev_raw_samples = ctx->prev_raw_samples; - bd[1].js_blocks = *(js_blocks + 1); - - // decode all blocks - for (b = 0; b < ctx->num_blocks; b++) { - unsigned int s; - - bd[0].block_length = div_blocks[b]; - bd[1].block_length = div_blocks[b]; - - bd[0].raw_samples = ctx->raw_samples[c ] + offset; - bd[1].raw_samples = ctx->raw_samples[c + 1] + offset; - - bd[0].raw_other = bd[1].raw_samples; - bd[1].raw_other = bd[0].raw_samples; - - if(read_decode_block(ctx, &bd[0]) || read_decode_block(ctx, &bd[1])) { - // damaged block, write zero for the rest of the frame - zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples); - zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples); - return -1; - } - - // reconstruct joint-stereo blocks - if (bd[0].js_blocks) { - if (bd[1].js_blocks) - av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair.\n"); - - for (s = 0; s < div_blocks[b]; s++) - bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s]; - } else if (bd[1].js_blocks) { - for (s = 0; s < div_blocks[b]; s++) - bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s]; - } - - offset += div_blocks[b]; - bd[0].ra_block = 0; - bd[1].ra_block = 0; - } - - // store carryover raw samples, - // the others channel raw samples are stored by the calling function. - memmove(ctx->raw_samples[c] - sconf->max_order, - ctx->raw_samples[c] - sconf->max_order + sconf->frame_length, - sizeof(*ctx->raw_samples[c]) * sconf->max_order); - - return 0; -} - - -/** Read the channel data. - */ -static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c) -{ - GetBitContext *gb = &ctx->gb; - ALSChannelData *current = cd; - unsigned int channels = ctx->avctx->channels; - int entries = 0; - - while (entries < channels && !(current->stop_flag = get_bits1(gb))) { - current->master_channel = get_bits_long(gb, av_ceil_log2(channels)); - - if (current->master_channel >= channels) { - av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel.\n"); - return -1; - } - - if (current->master_channel != c) { - current->time_diff_flag = get_bits1(gb); - current->weighting[0] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)]; - current->weighting[1] = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 31)]; - current->weighting[2] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)]; - - if (current->time_diff_flag) { - current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)]; - current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)]; - current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 31)]; - - current->time_diff_sign = get_bits1(gb); - current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3; - } - } - - current++; - entries++; - } - - if (entries == channels) { - av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data.\n"); - return -1; - } - - align_get_bits(gb); - return 0; -} - - -/** Recursively reverts the inter-channel correlation for a block. - */ -static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd, - ALSChannelData **cd, int *reverted, - unsigned int offset, int c) -{ - ALSChannelData *ch = cd[c]; - unsigned int dep = 0; - unsigned int channels = ctx->avctx->channels; - - if (reverted[c]) - return 0; - - reverted[c] = 1; - - while (dep < channels && !ch[dep].stop_flag) { - revert_channel_correlation(ctx, bd, cd, reverted, offset, - ch[dep].master_channel); - - dep++; - } - - if (dep == channels) { - av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation.\n"); - return -1; - } - - bd->const_block = ctx->const_block + c; - bd->shift_lsbs = ctx->shift_lsbs + c; - bd->opt_order = ctx->opt_order + c; - bd->store_prev_samples = ctx->store_prev_samples + c; - bd->use_ltp = ctx->use_ltp + c; - bd->ltp_lag = ctx->ltp_lag + c; - bd->ltp_gain = ctx->ltp_gain[c]; - bd->lpc_cof = ctx->lpc_cof[c]; - bd->quant_cof = ctx->quant_cof[c]; - bd->raw_samples = ctx->raw_samples[c] + offset; - - dep = 0; - while (!ch[dep].stop_flag) { - unsigned int smp; - unsigned int begin = 1; - unsigned int end = bd->block_length - 1; - int64_t y; - int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset; - - if (ch[dep].time_diff_flag) { - int t = ch[dep].time_diff_index; - - if (ch[dep].time_diff_sign) { - t = -t; - begin -= t; - } else { - end -= t; - } - - for (smp = begin; smp < end; smp++) { - y = (1 << 6) + - MUL64(ch[dep].weighting[0], master[smp - 1 ]) + - MUL64(ch[dep].weighting[1], master[smp ]) + - MUL64(ch[dep].weighting[2], master[smp + 1 ]) + - MUL64(ch[dep].weighting[3], master[smp - 1 + t]) + - MUL64(ch[dep].weighting[4], master[smp + t]) + - MUL64(ch[dep].weighting[5], master[smp + 1 + t]); - - bd->raw_samples[smp] += y >> 7; - } - } else { - for (smp = begin; smp < end; smp++) { - y = (1 << 6) + - MUL64(ch[dep].weighting[0], master[smp - 1]) + - MUL64(ch[dep].weighting[1], master[smp ]) + - MUL64(ch[dep].weighting[2], master[smp + 1]); - - bd->raw_samples[smp] += y >> 7; - } - } - - dep++; - } - - return 0; -} - - -/** Read the frame data. - */ -static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame) -{ - ALSSpecificConfig *sconf = &ctx->sconf; - AVCodecContext *avctx = ctx->avctx; - GetBitContext *gb = &ctx->gb; - unsigned int div_blocks[32]; ///< block sizes. - unsigned int c; - unsigned int js_blocks[2]; - - uint32_t bs_info = 0; - - // skip the size of the ra unit if present in the frame - if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame) - skip_bits_long(gb, 32); - - if (sconf->mc_coding && sconf->joint_stereo) { - ctx->js_switch = get_bits1(gb); - align_get_bits(gb); - } - - if (!sconf->mc_coding || ctx->js_switch) { - int independent_bs = !sconf->joint_stereo; - - for (c = 0; c < avctx->channels; c++) { - js_blocks[0] = 0; - js_blocks[1] = 0; - - get_block_sizes(ctx, div_blocks, &bs_info); - - // if joint_stereo and block_switching is set, independent decoding - // is signaled via the first bit of bs_info - if (sconf->joint_stereo && sconf->block_switching) - if (bs_info >> 31) - independent_bs = 2; - - // if this is the last channel, it has to be decoded independently - if (c == avctx->channels - 1) - independent_bs = 1; - - if (independent_bs) { - if (decode_blocks_ind(ctx, ra_frame, c, div_blocks, js_blocks)) - return -1; - - independent_bs--; - } else { - if (decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks)) - return -1; - - c++; - } - - // store carryover raw samples - memmove(ctx->raw_samples[c] - sconf->max_order, - ctx->raw_samples[c] - sconf->max_order + sconf->frame_length, - sizeof(*ctx->raw_samples[c]) * sconf->max_order); - } - } else { // multi-channel coding - ALSBlockData bd = { 0 }; - int b, ret; - int *reverted_channels = ctx->reverted_channels; - unsigned int offset = 0; - - for (c = 0; c < avctx->channels; c++) - if (ctx->chan_data[c] < ctx->chan_data_buffer) { - av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data.\n"); - return -1; - } - - memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels); - - bd.ra_block = ra_frame; - bd.prev_raw_samples = ctx->prev_raw_samples; - - get_block_sizes(ctx, div_blocks, &bs_info); - - for (b = 0; b < ctx->num_blocks; b++) { - bd.block_length = div_blocks[b]; - - for (c = 0; c < avctx->channels; c++) { - bd.const_block = ctx->const_block + c; - bd.shift_lsbs = ctx->shift_lsbs + c; - bd.opt_order = ctx->opt_order + c; - bd.store_prev_samples = ctx->store_prev_samples + c; - bd.use_ltp = ctx->use_ltp + c; - bd.ltp_lag = ctx->ltp_lag + c; - bd.ltp_gain = ctx->ltp_gain[c]; - bd.lpc_cof = ctx->lpc_cof[c]; - bd.quant_cof = ctx->quant_cof[c]; - bd.raw_samples = ctx->raw_samples[c] + offset; - bd.raw_other = NULL; - - if ((ret = read_block(ctx, &bd)) < 0) - return ret; - if ((ret = read_channel_data(ctx, ctx->chan_data[c], c)) < 0) - return ret; - } - - for (c = 0; c < avctx->channels; c++) - if (revert_channel_correlation(ctx, &bd, ctx->chan_data, - reverted_channels, offset, c)) - return -1; - - for (c = 0; c < avctx->channels; c++) { - bd.const_block = ctx->const_block + c; - bd.shift_lsbs = ctx->shift_lsbs + c; - bd.opt_order = ctx->opt_order + c; - bd.store_prev_samples = ctx->store_prev_samples + c; - bd.use_ltp = ctx->use_ltp + c; - bd.ltp_lag = ctx->ltp_lag + c; - bd.ltp_gain = ctx->ltp_gain[c]; - bd.lpc_cof = ctx->lpc_cof[c]; - bd.quant_cof = ctx->quant_cof[c]; - bd.raw_samples = ctx->raw_samples[c] + offset; - - if ((ret = decode_block(ctx, &bd)) < 0) - return ret; - } - - memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels)); - offset += div_blocks[b]; - bd.ra_block = 0; - } - - // store carryover raw samples - for (c = 0; c < avctx->channels; c++) - memmove(ctx->raw_samples[c] - sconf->max_order, - ctx->raw_samples[c] - sconf->max_order + sconf->frame_length, - sizeof(*ctx->raw_samples[c]) * sconf->max_order); - } - - // TODO: read_diff_float_data - - return 0; -} - - -/** Decode an ALS frame. - */ -static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, - AVPacket *avpkt) -{ - ALSDecContext *ctx = avctx->priv_data; - AVFrame *frame = data; - ALSSpecificConfig *sconf = &ctx->sconf; - const uint8_t *buffer = avpkt->data; - int buffer_size = avpkt->size; - int invalid_frame, ret; - unsigned int c, sample, ra_frame, bytes_read, shift; - - init_get_bits(&ctx->gb, buffer, buffer_size * 8); - - // In the case that the distance between random access frames is set to zero - // (sconf->ra_distance == 0) no frame is treated as a random access frame. - // For the first frame, if prediction is used, all samples used from the - // previous frame are assumed to be zero. - ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance); - - // the last frame to decode might have a different length - if (sconf->samples != 0xFFFFFFFF) - ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length, - sconf->frame_length); - else - ctx->cur_frame_length = sconf->frame_length; - - // decode the frame data - if ((invalid_frame = read_frame_data(ctx, ra_frame)) < 0) - av_log(ctx->avctx, AV_LOG_WARNING, - "Reading frame data failed. Skipping RA unit.\n"); - - ctx->frame_id++; - - /* get output buffer */ - frame->nb_samples = ctx->cur_frame_length; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - - // transform decoded frame into output format - #define INTERLEAVE_OUTPUT(bps) \ - { \ - int##bps##_t *dest = (int##bps##_t*)frame->data[0]; \ - shift = bps - ctx->avctx->bits_per_raw_sample; \ - if (!ctx->cs_switch) { \ - for (sample = 0; sample < ctx->cur_frame_length; sample++) \ - for (c = 0; c < avctx->channels; c++) \ - *dest++ = ctx->raw_samples[c][sample] << shift; \ - } else { \ - for (sample = 0; sample < ctx->cur_frame_length; sample++) \ - for (c = 0; c < avctx->channels; c++) \ - *dest++ = ctx->raw_samples[sconf->chan_pos[c]][sample] << shift; \ - } \ - } - - if (ctx->avctx->bits_per_raw_sample <= 16) { - INTERLEAVE_OUTPUT(16) - } else { - INTERLEAVE_OUTPUT(32) - } - - // update CRC - if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) { - int swap = HAVE_BIGENDIAN != sconf->msb_first; - - if (ctx->avctx->bits_per_raw_sample == 24) { - int32_t *src = (int32_t *)frame->data[0]; - - for (sample = 0; - sample < ctx->cur_frame_length * avctx->channels; - sample++) { - int32_t v; - - if (swap) - v = av_bswap32(src[sample]); - else - v = src[sample]; - if (!HAVE_BIGENDIAN) - v >>= 8; - - ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3); - } - } else { - uint8_t *crc_source; - - if (swap) { - if (ctx->avctx->bits_per_raw_sample <= 16) { - int16_t *src = (int16_t*) frame->data[0]; - int16_t *dest = (int16_t*) ctx->crc_buffer; - for (sample = 0; - sample < ctx->cur_frame_length * avctx->channels; - sample++) - *dest++ = av_bswap16(src[sample]); - } else { - ctx->dsp.bswap_buf((uint32_t*)ctx->crc_buffer, - (uint32_t *)frame->data[0], - ctx->cur_frame_length * avctx->channels); - } - crc_source = ctx->crc_buffer; - } else { - crc_source = frame->data[0]; - } - - ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source, - ctx->cur_frame_length * avctx->channels * - av_get_bytes_per_sample(avctx->sample_fmt)); - } - - - // check CRC sums if this is the last frame - if (ctx->cur_frame_length != sconf->frame_length && - ctx->crc_org != ctx->crc) { - av_log(avctx, AV_LOG_ERROR, "CRC error.\n"); - } - } - - *got_frame_ptr = 1; - - bytes_read = invalid_frame ? buffer_size : - (get_bits_count(&ctx->gb) + 7) >> 3; - - return bytes_read; -} - - -/** Uninitialize the ALS decoder. - */ -static av_cold int decode_end(AVCodecContext *avctx) -{ - ALSDecContext *ctx = avctx->priv_data; - - av_freep(&ctx->sconf.chan_pos); - - ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status); - - av_freep(&ctx->const_block); - av_freep(&ctx->shift_lsbs); - av_freep(&ctx->opt_order); - av_freep(&ctx->store_prev_samples); - av_freep(&ctx->use_ltp); - av_freep(&ctx->ltp_lag); - av_freep(&ctx->ltp_gain); - av_freep(&ctx->ltp_gain_buffer); - av_freep(&ctx->quant_cof); - av_freep(&ctx->lpc_cof); - av_freep(&ctx->quant_cof_buffer); - av_freep(&ctx->lpc_cof_buffer); - av_freep(&ctx->lpc_cof_reversed_buffer); - av_freep(&ctx->prev_raw_samples); - av_freep(&ctx->raw_samples); - av_freep(&ctx->raw_buffer); - av_freep(&ctx->chan_data); - av_freep(&ctx->chan_data_buffer); - av_freep(&ctx->reverted_channels); - av_freep(&ctx->crc_buffer); - - return 0; -} - - -/** Initialize the ALS decoder. - */ -static av_cold int decode_init(AVCodecContext *avctx) -{ - unsigned int c; - unsigned int channel_size; - int num_buffers; - ALSDecContext *ctx = avctx->priv_data; - ALSSpecificConfig *sconf = &ctx->sconf; - ctx->avctx = avctx; - - if (!avctx->extradata) { - av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n"); - return -1; - } - - if (read_specific_config(ctx)) { - av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n"); - decode_end(avctx); - return -1; - } - - if (check_specific_config(ctx)) { - decode_end(avctx); - return -1; - } - - if (sconf->bgmc) - ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status); - - if (sconf->floating) { - avctx->sample_fmt = AV_SAMPLE_FMT_FLT; - avctx->bits_per_raw_sample = 32; - } else { - avctx->sample_fmt = sconf->resolution > 1 - ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16; - avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8; - } - - // set maximum Rice parameter for progressive decoding based on resolution - // This is not specified in 14496-3 but actually done by the reference - // codec RM22 revision 2. - ctx->s_max = sconf->resolution > 1 ? 31 : 15; - - // set lag value for long-term prediction - ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) + - (avctx->sample_rate >= 192000); - - // allocate quantized parcor coefficient buffer - num_buffers = sconf->mc_coding ? avctx->channels : 1; - - ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers); - ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers); - ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) * - num_buffers * sconf->max_order); - ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) * - num_buffers * sconf->max_order); - ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) * - sconf->max_order); - - if (!ctx->quant_cof || !ctx->lpc_cof || - !ctx->quant_cof_buffer || !ctx->lpc_cof_buffer || - !ctx->lpc_cof_reversed_buffer) { - av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); - return AVERROR(ENOMEM); - } - - // assign quantized parcor coefficient buffers - for (c = 0; c < num_buffers; c++) { - ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order; - ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order; - } - - // allocate and assign lag and gain data buffer for ltp mode - ctx->const_block = av_malloc (sizeof(*ctx->const_block) * num_buffers); - ctx->shift_lsbs = av_malloc (sizeof(*ctx->shift_lsbs) * num_buffers); - ctx->opt_order = av_malloc (sizeof(*ctx->opt_order) * num_buffers); - ctx->store_prev_samples = av_malloc(sizeof(*ctx->store_prev_samples) * num_buffers); - ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers); - ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers); - ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers); - ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) * - num_buffers * 5); - - if (!ctx->const_block || !ctx->shift_lsbs || - !ctx->opt_order || !ctx->store_prev_samples || - !ctx->use_ltp || !ctx->ltp_lag || - !ctx->ltp_gain || !ctx->ltp_gain_buffer) { - av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); - decode_end(avctx); - return AVERROR(ENOMEM); - } - - for (c = 0; c < num_buffers; c++) - ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5; - - // allocate and assign channel data buffer for mcc mode - if (sconf->mc_coding) { - ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) * - num_buffers * num_buffers); - ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) * - num_buffers); - ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) * - num_buffers); - - if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) { - av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); - decode_end(avctx); - return AVERROR(ENOMEM); - } - - for (c = 0; c < num_buffers; c++) - ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers; - } else { - ctx->chan_data = NULL; - ctx->chan_data_buffer = NULL; - ctx->reverted_channels = NULL; - } - - channel_size = sconf->frame_length + sconf->max_order; - - ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order); - ctx->raw_buffer = av_mallocz(sizeof(*ctx-> raw_buffer) * avctx->channels * channel_size); - ctx->raw_samples = av_malloc (sizeof(*ctx-> raw_samples) * avctx->channels); - - // allocate previous raw sample buffer - if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) { - av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); - decode_end(avctx); - return AVERROR(ENOMEM); - } - - // assign raw samples buffers - ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order; - for (c = 1; c < avctx->channels; c++) - ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size; - - // allocate crc buffer - if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled && - (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) { - ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) * - ctx->cur_frame_length * - avctx->channels * - av_get_bytes_per_sample(avctx->sample_fmt)); - if (!ctx->crc_buffer) { - av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); - decode_end(avctx); - return AVERROR(ENOMEM); - } - } - - ff_dsputil_init(&ctx->dsp, avctx); - - return 0; -} - - -/** Flush (reset) the frame ID after seeking. - */ -static av_cold void flush(AVCodecContext *avctx) -{ - ALSDecContext *ctx = avctx->priv_data; - - ctx->frame_id = 0; -} - - -AVCodec ff_als_decoder = { - .name = "als", - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_MP4ALS, - .priv_data_size = sizeof(ALSDecContext), - .init = decode_init, - .close = decode_end, - .decode = decode_frame, - .flush = flush, - .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"), -}; |