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190 lines
9.0 KiB
190 lines
9.0 KiB
/* |
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* DCA compatible decoder |
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* Copyright (C) 2004 Gildas Bazin |
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* Copyright (C) 2004 Benjamin Zores |
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* Copyright (C) 2006 Benjamin Larsson |
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* Copyright (C) 2007 Konstantin Shishkov |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_DCA_H |
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#define AVCODEC_DCA_H |
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#include <stdint.h> |
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#include "libavutil/float_dsp.h" |
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#include "libavutil/internal.h" |
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#include "avcodec.h" |
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#include "dcadsp.h" |
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#include "fmtconvert.h" |
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#include "get_bits.h" |
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#define DCA_PRIM_CHANNELS_MAX (7) |
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#define DCA_ABITS_MAX (32) /* Should be 28 */ |
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#define DCA_SUBSUBFRAMES_MAX (4) |
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#define DCA_SUBFRAMES_MAX (16) |
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#define DCA_BLOCKS_MAX (16) |
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#define DCA_LFE_MAX (3) |
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#define DCA_MAX_FRAME_SIZE 16384 |
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#define DCA_MAX_EXSS_HEADER_SIZE 4096 |
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#define DCA_BUFFER_PADDING_SIZE 1024 |
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enum DCAExtensionMask { |
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DCA_EXT_CORE = 0x001, ///< core in core substream |
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DCA_EXT_XXCH = 0x002, ///< XXCh channels extension in core substream |
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DCA_EXT_X96 = 0x004, ///< 96/24 extension in core substream |
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DCA_EXT_XCH = 0x008, ///< XCh channel extension in core substream |
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DCA_EXT_EXSS_CORE = 0x010, ///< core in ExSS (extension substream) |
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DCA_EXT_EXSS_XBR = 0x020, ///< extended bitrate extension in ExSS |
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DCA_EXT_EXSS_XXCH = 0x040, ///< XXCh channels extension in ExSS |
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DCA_EXT_EXSS_X96 = 0x080, ///< 96/24 extension in ExSS |
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DCA_EXT_EXSS_LBR = 0x100, ///< low bitrate component in ExSS |
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DCA_EXT_EXSS_XLL = 0x200, ///< lossless extension in ExSS |
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}; |
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typedef struct DCAContext { |
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AVClass *class; ///< class for AVOptions |
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AVCodecContext *avctx; |
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/* Frame header */ |
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int frame_type; ///< type of the current frame |
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int samples_deficit; ///< deficit sample count |
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int crc_present; ///< crc is present in the bitstream |
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int sample_blocks; ///< number of PCM sample blocks |
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int frame_size; ///< primary frame byte size |
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int amode; ///< audio channels arrangement |
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int sample_rate; ///< audio sampling rate |
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int bit_rate; ///< transmission bit rate |
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int bit_rate_index; ///< transmission bit rate index |
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int dynrange; ///< embedded dynamic range flag |
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int timestamp; ///< embedded time stamp flag |
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int aux_data; ///< auxiliary data flag |
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int hdcd; ///< source material is mastered in HDCD |
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int ext_descr; ///< extension audio descriptor flag |
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int ext_coding; ///< extended coding flag |
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int aspf; ///< audio sync word insertion flag |
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int lfe; ///< low frequency effects flag |
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int predictor_history; ///< predictor history flag |
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int header_crc; ///< header crc check bytes |
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int multirate_inter; ///< multirate interpolator switch |
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int version; ///< encoder software revision |
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int copy_history; ///< copy history |
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int source_pcm_res; ///< source pcm resolution |
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int front_sum; ///< front sum/difference flag |
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int surround_sum; ///< surround sum/difference flag |
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int dialog_norm; ///< dialog normalisation parameter |
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/* Primary audio coding header */ |
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int subframes; ///< number of subframes |
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int total_channels; ///< number of channels including extensions |
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int prim_channels; ///< number of primary audio channels |
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int subband_activity[DCA_PRIM_CHANNELS_MAX]; ///< subband activity count |
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int vq_start_subband[DCA_PRIM_CHANNELS_MAX]; ///< high frequency vq start subband |
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int joint_intensity[DCA_PRIM_CHANNELS_MAX]; ///< joint intensity coding index |
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int transient_huffman[DCA_PRIM_CHANNELS_MAX]; ///< transient mode code book |
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int scalefactor_huffman[DCA_PRIM_CHANNELS_MAX]; ///< scale factor code book |
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int bitalloc_huffman[DCA_PRIM_CHANNELS_MAX]; ///< bit allocation quantizer select |
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int quant_index_huffman[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; ///< quantization index codebook select |
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float scalefactor_adj[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; ///< scale factor adjustment |
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/* Primary audio coding side information */ |
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int subsubframes[DCA_SUBFRAMES_MAX]; ///< number of subsubframes |
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int partial_samples[DCA_SUBFRAMES_MAX]; ///< partial subsubframe samples count |
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int prediction_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< prediction mode (ADPCM used or not) |
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int prediction_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< prediction VQ coefs |
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int bitalloc[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< bit allocation index |
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int transition_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< transition mode (transients) |
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int32_t scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][2];///< scale factors (2 if transient) |
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int joint_huff[DCA_PRIM_CHANNELS_MAX]; ///< joint subband scale factors codebook |
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int joint_scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< joint subband scale factors |
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float downmix_coef[DCA_PRIM_CHANNELS_MAX + 1][2]; ///< stereo downmix coefficients |
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int dynrange_coef; ///< dynamic range coefficient |
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/* Core substream's embedded downmix coefficients (cf. ETSI TS 102 114 V1.4.1) |
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* Input: primary audio channels (incl. LFE if present) |
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* Output: downmix audio channels (up to 4, no LFE) */ |
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uint8_t core_downmix; ///< embedded downmix coefficients available |
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uint8_t core_downmix_amode; ///< audio channel arrangement of embedded downmix |
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uint16_t core_downmix_codes[DCA_PRIM_CHANNELS_MAX + 1][4]; ///< embedded downmix coefficients (9-bit codes) |
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int32_t high_freq_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< VQ encoded high frequency subbands |
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float lfe_data[2 * DCA_LFE_MAX * (DCA_BLOCKS_MAX + 4)]; ///< Low frequency effect data |
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int lfe_scale_factor; |
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/* Subband samples history (for ADPCM) */ |
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DECLARE_ALIGNED(16, float, subband_samples_hist)[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][4]; |
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DECLARE_ALIGNED(32, float, subband_fir_hist)[DCA_PRIM_CHANNELS_MAX][512]; |
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DECLARE_ALIGNED(32, float, subband_fir_noidea)[DCA_PRIM_CHANNELS_MAX][32]; |
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int hist_index[DCA_PRIM_CHANNELS_MAX]; |
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DECLARE_ALIGNED(32, float, raXin)[32]; |
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int output; ///< type of output |
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DECLARE_ALIGNED(32, float, subband_samples)[DCA_BLOCKS_MAX][DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][8]; |
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float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1]; |
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float *extra_channels[DCA_PRIM_CHANNELS_MAX + 1]; |
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uint8_t *extra_channels_buffer; |
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unsigned int extra_channels_buffer_size; |
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uint8_t dca_buffer[DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE + DCA_BUFFER_PADDING_SIZE]; |
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int dca_buffer_size; ///< how much data is in the dca_buffer |
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const int8_t *channel_order_tab; ///< channel reordering table, lfe and non lfe |
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GetBitContext gb; |
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/* Current position in DCA frame */ |
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int current_subframe; |
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int current_subsubframe; |
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int core_ext_mask; ///< present extensions in the core substream |
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/* XCh extension information */ |
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int xch_present; ///< XCh extension present and valid |
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int xch_base_channel; ///< index of first (only) channel containing XCH data |
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int xch_disable; ///< whether the XCh extension should be decoded or not |
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/* ExSS header parser */ |
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int static_fields; ///< static fields present |
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int mix_metadata; ///< mixing metadata present |
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int num_mix_configs; ///< number of mix out configurations |
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int mix_config_num_ch[4]; ///< number of channels in each mix out configuration |
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int profile; |
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int debug_flag; ///< used for suppressing repeated error messages output |
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AVFloatDSPContext fdsp; |
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FFTContext imdct; |
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SynthFilterContext synth; |
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DCADSPContext dcadsp; |
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FmtConvertContext fmt_conv; |
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} DCAContext; |
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extern av_export const uint32_t avpriv_dca_sample_rates[16]; |
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/** |
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* Convert bitstream to one representation based on sync marker |
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*/ |
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int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst, |
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int max_size); |
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void ff_dca_exss_parse_header(DCAContext *s); |
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#endif /* AVCODEC_DCA_H */
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