2 * DCA compatible decoder
3 * Copyright (C) 2004 Gildas Bazin
4 * Copyright (C) 2004 Benjamin Zores
5 * Copyright (C) 2006 Benjamin Larsson
6 * Copyright (C) 2007 Konstantin Shishkov
8 * This file is part of FFmpeg.
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 #include "libavutil/float_dsp.h"
31 #include "libavutil/internal.h"
35 #include "fmtconvert.h"
38 /** DCA syncwords, also used for bitstream type detection */
39 #define DCA_MARKER_RAW_BE 0x7FFE8001
40 #define DCA_MARKER_RAW_LE 0xFE7F0180
41 #define DCA_MARKER_14B_BE 0x1FFFE800
42 #define DCA_MARKER_14B_LE 0xFF1F00E8
44 /** DCA-HD specific block starts with this marker. */
45 #define DCA_HD_MARKER 0x64582025
47 #define DCA_PRIM_CHANNELS_MAX (7)
48 #define DCA_ABITS_MAX (32) /* Should be 28 */
49 #define DCA_SUBSUBFRAMES_MAX (4)
50 #define DCA_SUBFRAMES_MAX (16)
51 #define DCA_BLOCKS_MAX (16)
52 #define DCA_LFE_MAX (3)
53 #define DCA_CHSETS_MAX (4)
54 #define DCA_CHSET_CHANS_MAX (8)
56 #define DCA_MAX_FRAME_SIZE 16384
57 #define DCA_MAX_EXSS_HEADER_SIZE 4096
59 #define DCA_BUFFER_PADDING_SIZE 1024
61 enum DCAExtensionMask {
62 DCA_EXT_CORE = 0x001, ///< core in core substream
63 DCA_EXT_XXCH = 0x002, ///< XXCh channels extension in core substream
64 DCA_EXT_X96 = 0x004, ///< 96/24 extension in core substream
65 DCA_EXT_XCH = 0x008, ///< XCh channel extension in core substream
66 DCA_EXT_EXSS_CORE = 0x010, ///< core in ExSS (extension substream)
67 DCA_EXT_EXSS_XBR = 0x020, ///< extended bitrate extension in ExSS
68 DCA_EXT_EXSS_XXCH = 0x040, ///< XXCh channels extension in ExSS
69 DCA_EXT_EXSS_X96 = 0x080, ///< 96/24 extension in ExSS
70 DCA_EXT_EXSS_LBR = 0x100, ///< low bitrate component in ExSS
71 DCA_EXT_EXSS_XLL = 0x200, ///< lossless extension in ExSS
74 typedef struct DCAContext {
75 const AVClass *class; ///< class for AVOptions
76 AVCodecContext *avctx;
78 int frame_type; ///< type of the current frame
79 int samples_deficit; ///< deficit sample count
80 int crc_present; ///< crc is present in the bitstream
81 int sample_blocks; ///< number of PCM sample blocks
82 int frame_size; ///< primary frame byte size
83 int amode; ///< audio channels arrangement
84 int sample_rate; ///< audio sampling rate
85 int bit_rate; ///< transmission bit rate
86 int bit_rate_index; ///< transmission bit rate index
88 int dynrange; ///< embedded dynamic range flag
89 int timestamp; ///< embedded time stamp flag
90 int aux_data; ///< auxiliary data flag
91 int hdcd; ///< source material is mastered in HDCD
92 int ext_descr; ///< extension audio descriptor flag
93 int ext_coding; ///< extended coding flag
94 int aspf; ///< audio sync word insertion flag
95 int lfe; ///< low frequency effects flag
96 int predictor_history; ///< predictor history flag
97 int header_crc; ///< header crc check bytes
98 int multirate_inter; ///< multirate interpolator switch
99 int version; ///< encoder software revision
100 int copy_history; ///< copy history
101 int source_pcm_res; ///< source pcm resolution
102 int front_sum; ///< front sum/difference flag
103 int surround_sum; ///< surround sum/difference flag
104 int dialog_norm; ///< dialog normalisation parameter
106 /* Primary audio coding header */
107 int subframes; ///< number of subframes
108 int total_channels; ///< number of channels including extensions
109 int prim_channels; ///< number of primary audio channels
110 int subband_activity[DCA_PRIM_CHANNELS_MAX]; ///< subband activity count
111 int vq_start_subband[DCA_PRIM_CHANNELS_MAX]; ///< high frequency vq start subband
112 int joint_intensity[DCA_PRIM_CHANNELS_MAX]; ///< joint intensity coding index
113 int transient_huffman[DCA_PRIM_CHANNELS_MAX]; ///< transient mode code book
114 int scalefactor_huffman[DCA_PRIM_CHANNELS_MAX]; ///< scale factor code book
115 int bitalloc_huffman[DCA_PRIM_CHANNELS_MAX]; ///< bit allocation quantizer select
116 int quant_index_huffman[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; ///< quantization index codebook select
117 float scalefactor_adj[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; ///< scale factor adjustment
119 /* Primary audio coding side information */
120 int subsubframes[DCA_SUBFRAMES_MAX]; ///< number of subsubframes
121 int partial_samples[DCA_SUBFRAMES_MAX]; ///< partial subsubframe samples count
122 int prediction_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< prediction mode (ADPCM used or not)
123 int prediction_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< prediction VQ coefs
124 int bitalloc[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< bit allocation index
125 int transition_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< transition mode (transients)
126 int32_t scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][2];///< scale factors (2 if transient)
127 int joint_huff[DCA_PRIM_CHANNELS_MAX]; ///< joint subband scale factors codebook
128 int joint_scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< joint subband scale factors
129 float downmix_coef[DCA_PRIM_CHANNELS_MAX + 1][2]; ///< stereo downmix coefficients
130 int dynrange_coef; ///< dynamic range coefficient
132 /* Core substream's embedded downmix coefficients (cf. ETSI TS 102 114 V1.4.1)
133 * Input: primary audio channels (incl. LFE if present)
134 * Output: downmix audio channels (up to 4, no LFE) */
135 uint8_t core_downmix; ///< embedded downmix coefficients available
136 uint8_t core_downmix_amode; ///< audio channel arrangement of embedded downmix
137 uint16_t core_downmix_codes[DCA_PRIM_CHANNELS_MAX + 1][4]; ///< embedded downmix coefficients (9-bit codes)
139 int32_t high_freq_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< VQ encoded high frequency subbands
141 float lfe_data[2 * DCA_LFE_MAX * (DCA_BLOCKS_MAX + 4)]; ///< Low frequency effect data
142 int lfe_scale_factor;
144 /* Subband samples history (for ADPCM) */
145 DECLARE_ALIGNED(16, float, subband_samples_hist)[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][4];
146 DECLARE_ALIGNED(32, float, subband_fir_hist)[DCA_PRIM_CHANNELS_MAX][512];
147 DECLARE_ALIGNED(32, float, subband_fir_noidea)[DCA_PRIM_CHANNELS_MAX][32];
148 int hist_index[DCA_PRIM_CHANNELS_MAX];
149 DECLARE_ALIGNED(32, float, raXin)[32];
151 int output; ///< type of output
153 DECLARE_ALIGNED(32, float, subband_samples)[DCA_BLOCKS_MAX][DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][8];
154 float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];
155 float *extra_channels[DCA_PRIM_CHANNELS_MAX + 1];
156 uint8_t *extra_channels_buffer;
157 unsigned int extra_channels_buffer_size;
159 uint8_t dca_buffer[DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE + DCA_BUFFER_PADDING_SIZE];
160 int dca_buffer_size; ///< how much data is in the dca_buffer
162 const int8_t *channel_order_tab; ///< channel reordering table, lfe and non lfe
164 /* Current position in DCA frame */
165 int current_subframe;
166 int current_subsubframe;
168 int core_ext_mask; ///< present extensions in the core substream
170 /* XCh extension information */
171 int xch_present; ///< XCh extension present and valid
172 int xch_base_channel; ///< index of first (only) channel containing XCH data
173 int xch_disable; ///< whether the XCh extension should be decoded or not
175 /* XXCH extension information */
177 int xxch_nbits_spk_mask;
178 uint32_t xxch_core_spkmask;
179 uint32_t xxch_spk_masks[4]; /* speaker masks, last element is core mask */
180 int xxch_chset_nch[4];
181 float xxch_dmix_sf[DCA_CHSETS_MAX];
183 uint32_t xxch_dmix_embedded; /* lower layer has mix pre-embedded, per chset */
184 float xxch_dmix_coeff[DCA_PRIM_CHANNELS_MAX][32]; /* worst case sizing */
186 int8_t xxch_order_tab[32];
189 /* ExSS header parser */
190 int static_fields; ///< static fields present
191 int mix_metadata; ///< mixing metadata present
192 int num_mix_configs; ///< number of mix out configurations
193 int mix_config_num_ch[4]; ///< number of channels in each mix out configuration
197 int debug_flag; ///< used for suppressing repeated error messages output
198 AVFloatDSPContext *fdsp;
200 SynthFilterContext synth;
201 DCADSPContext dcadsp;
202 FmtConvertContext fmt_conv;
205 extern av_export const uint32_t avpriv_dca_sample_rates[16];
208 * Convert bitstream to one representation based on sync marker
210 int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
213 int ff_dca_xbr_parse_frame(DCAContext *s);
214 int ff_dca_xxch_decode_frame(DCAContext *s);
216 void ff_dca_exss_parse_header(DCAContext *s);
218 #endif /* AVCODEC_DCA_H */