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      1 /*
      2  *  compress_params.h - codec types and parameters for compressed data
      3  *  streaming interface
      4  *
      5  *  Copyright (C) 2011 Intel Corporation
      6  *  Authors:	Pierre-Louis Bossart <pierre-louis.bossart (at) linux.intel.com>
      7  *              Vinod Koul <vinod.koul (at) linux.intel.com>
      8  *
      9  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     10  *
     11  *  This program is free software; you can redistribute it and/or modify
     12  *  it under the terms of the GNU General Public License as published by
     13  *  the Free Software Foundation; version 2 of the License.
     14  *
     15  *  This program is distributed in the hope that it will be useful, but
     16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
     17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     18  *  General Public License for more details.
     19  *
     20  *  You should have received a copy of the GNU General Public License along
     21  *  with this program; if not, write to the Free Software Foundation, Inc.,
     22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
     23  *
     24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     25  *
     26  * The definitions in this file are derived from the OpenMAX AL version 1.1
     27  * and OpenMAX IL v 1.1.2 header files which contain the copyright notice below.
     28  *
     29  * Copyright (c) 2007-2010 The Khronos Group Inc.
     30  *
     31  * Permission is hereby granted, free of charge, to any person obtaining
     32  * a copy of this software and/or associated documentation files (the
     33  * "Materials "), to deal in the Materials without restriction, including
     34  * without limitation the rights to use, copy, modify, merge, publish,
     35  * distribute, sublicense, and/or sell copies of the Materials, and to
     36  * permit persons to whom the Materials are furnished to do so, subject to
     37  * the following conditions:
     38  *
     39  * The above copyright notice and this permission notice shall be included
     40  * in all copies or substantial portions of the Materials.
     41  *
     42  * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     43  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     44  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     45  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
     46  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     47  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     48  * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
     49  *
     50  */
     51 #ifndef __SND_COMPRESS_PARAMS_H
     52 #define __SND_COMPRESS_PARAMS_H
     53 
     54 #include <linux/types.h>
     55 
     56 /* AUDIO CODECS SUPPORTED */
     57 #define MAX_NUM_CODECS 32
     58 #define MAX_NUM_CODEC_DESCRIPTORS 32
     59 #define MAX_NUM_BITRATES 32
     60 #define MAX_NUM_SAMPLE_RATES 32
     61 
     62 /* compressed TX */
     63 #define MAX_NUM_FRAMES_PER_BUFFER 1
     64 #define COMPRESSED_META_DATA_MODE 0x10
     65 #define META_DATA_LEN_BYTES 36
     66 #define Q6_AC3_DECODER	0x00010BF6
     67 #define Q6_EAC3_DECODER 0x00010C3C
     68 #define Q6_DTS		0x00010D88
     69 #define Q6_DTS_LBR	0x00010DBB
     70 
     71 /* Codecs are listed linearly to allow for extensibility */
     72 #define SND_AUDIOCODEC_PCM                   ((__u32) 0x00000001)
     73 #define SND_AUDIOCODEC_MP3                   ((__u32) 0x00000002)
     74 #define SND_AUDIOCODEC_AMR                   ((__u32) 0x00000003)
     75 #define SND_AUDIOCODEC_AMRWB                 ((__u32) 0x00000004)
     76 #define SND_AUDIOCODEC_AMRWBPLUS             ((__u32) 0x00000005)
     77 #define SND_AUDIOCODEC_AAC                   ((__u32) 0x00000006)
     78 #define SND_AUDIOCODEC_WMA                   ((__u32) 0x00000007)
     79 #define SND_AUDIOCODEC_REAL                  ((__u32) 0x00000008)
     80 #define SND_AUDIOCODEC_VORBIS                ((__u32) 0x00000009)
     81 #define SND_AUDIOCODEC_FLAC                  ((__u32) 0x0000000A)
     82 #define SND_AUDIOCODEC_IEC61937              ((__u32) 0x0000000B)
     83 #define SND_AUDIOCODEC_G723_1                ((__u32) 0x0000000C)
     84 #define SND_AUDIOCODEC_G729                  ((__u32) 0x0000000D)
     85 #define SND_AUDIOCODEC_DTS_PASS_THROUGH      ((__u32) 0x0000000E)
     86 #define SND_AUDIOCODEC_DTS_LBR               ((__u32) 0x0000000F)
     87 #define SND_AUDIOCODEC_DTS_TRANSCODE_LOOPBACK ((__u32) 0x00000010)
     88 #define SND_AUDIOCODEC_PASS_THROUGH          ((__u32) 0x00000011)
     89 #define SND_AUDIOCODEC_MP2                   ((__u32) 0x00000012)
     90 #define SND_AUDIOCODEC_DTS_LBR_PASS_THROUGH  ((__u32) 0x00000013)
     91 #define SND_AUDIOCODEC_AC3                   ((__u32) 0x00000014)
     92 #define SND_AUDIOCODEC_AC3_PASS_THROUGH      ((__u32) 0x00000015)
     93 #define SND_AUDIOCODEC_WMA_PRO               ((__u32) 0x00000016)
     94 #define SND_AUDIOCODEC_DTS             	     ((__u32) 0x00000017)
     95 #define SND_AUDIOCODEC_EAC3                  ((__u32) 0x00000018)
     96 #define SND_AUDIOCODEC_MAX                   SND_AUDIOCODEC_EAC3
     97 /*
     98  * Profile and modes are listed with bit masks. This allows for a
     99  * more compact representation of fields that will not evolve
    100  * (in contrast to the list of codecs)
    101  */
    102 
    103 #define SND_AUDIOPROFILE_PCM                 ((__u32) 0x00000001)
    104 
    105 /* MP3 modes are only useful for encoders */
    106 #define SND_AUDIOCHANMODE_MP3_MONO           ((__u32) 0x00000001)
    107 #define SND_AUDIOCHANMODE_MP3_STEREO         ((__u32) 0x00000002)
    108 #define SND_AUDIOCHANMODE_MP3_JOINTSTEREO    ((__u32) 0x00000004)
    109 #define SND_AUDIOCHANMODE_MP3_DUAL           ((__u32) 0x00000008)
    110 
    111 #define SND_AUDIOPROFILE_AMR                 ((__u32) 0x00000001)
    112 
    113 /* AMR modes are only useful for encoders */
    114 #define SND_AUDIOMODE_AMR_DTX_OFF            ((__u32) 0x00000001)
    115 #define SND_AUDIOMODE_AMR_VAD1               ((__u32) 0x00000002)
    116 #define SND_AUDIOMODE_AMR_VAD2               ((__u32) 0x00000004)
    117 
    118 #define SND_AUDIOSTREAMFORMAT_UNDEFINED	     ((__u32) 0x00000000)
    119 #define SND_AUDIOSTREAMFORMAT_CONFORMANCE    ((__u32) 0x00000001)
    120 #define SND_AUDIOSTREAMFORMAT_IF1            ((__u32) 0x00000002)
    121 #define SND_AUDIOSTREAMFORMAT_IF2            ((__u32) 0x00000004)
    122 #define SND_AUDIOSTREAMFORMAT_FSF            ((__u32) 0x00000008)
    123 #define SND_AUDIOSTREAMFORMAT_RTPPAYLOAD     ((__u32) 0x00000010)
    124 #define SND_AUDIOSTREAMFORMAT_ITU            ((__u32) 0x00000020)
    125 
    126 #define SND_AUDIOPROFILE_AMRWB               ((__u32) 0x00000001)
    127 
    128 /* AMRWB modes are only useful for encoders */
    129 #define SND_AUDIOMODE_AMRWB_DTX_OFF          ((__u32) 0x00000001)
    130 #define SND_AUDIOMODE_AMRWB_VAD1             ((__u32) 0x00000002)
    131 #define SND_AUDIOMODE_AMRWB_VAD2             ((__u32) 0x00000004)
    132 
    133 #define SND_AUDIOPROFILE_AMRWBPLUS           ((__u32) 0x00000001)
    134 
    135 #define SND_AUDIOPROFILE_AAC                 ((__u32) 0x00000001)
    136 
    137 /* AAC modes are required for encoders and decoders */
    138 #define SND_AUDIOMODE_AAC_MAIN               ((__u32) 0x00000001)
    139 #define SND_AUDIOMODE_AAC_LC                 ((__u32) 0x00000002)
    140 #define SND_AUDIOMODE_AAC_SSR                ((__u32) 0x00000004)
    141 #define SND_AUDIOMODE_AAC_LTP                ((__u32) 0x00000008)
    142 #define SND_AUDIOMODE_AAC_HE                 ((__u32) 0x00000010)
    143 #define SND_AUDIOMODE_AAC_SCALABLE           ((__u32) 0x00000020)
    144 #define SND_AUDIOMODE_AAC_ERLC               ((__u32) 0x00000040)
    145 #define SND_AUDIOMODE_AAC_LD                 ((__u32) 0x00000080)
    146 #define SND_AUDIOMODE_AAC_HE_PS              ((__u32) 0x00000100)
    147 #define SND_AUDIOMODE_AAC_HE_MPS             ((__u32) 0x00000200)
    148 
    149 /* AAC formats are required for encoders and decoders */
    150 #define SND_AUDIOSTREAMFORMAT_MP2ADTS        ((__u32) 0x00000001)
    151 #define SND_AUDIOSTREAMFORMAT_MP4ADTS        ((__u32) 0x00000002)
    152 #define SND_AUDIOSTREAMFORMAT_MP4LOAS        ((__u32) 0x00000004)
    153 #define SND_AUDIOSTREAMFORMAT_MP4LATM        ((__u32) 0x00000008)
    154 #define SND_AUDIOSTREAMFORMAT_ADIF           ((__u32) 0x00000010)
    155 #define SND_AUDIOSTREAMFORMAT_MP4FF          ((__u32) 0x00000020)
    156 #define SND_AUDIOSTREAMFORMAT_RAW            ((__u32) 0x00000040)
    157 
    158 #define SND_AUDIOPROFILE_WMA7                ((__u32) 0x00000001)
    159 #define SND_AUDIOPROFILE_WMA8                ((__u32) 0x00000002)
    160 #define SND_AUDIOPROFILE_WMA9                ((__u32) 0x00000004)
    161 #define SND_AUDIOPROFILE_WMA10               ((__u32) 0x00000008)
    162 
    163 #define SND_AUDIOMODE_WMA_LEVEL1             ((__u32) 0x00000001)
    164 #define SND_AUDIOMODE_WMA_LEVEL2             ((__u32) 0x00000002)
    165 #define SND_AUDIOMODE_WMA_LEVEL3             ((__u32) 0x00000004)
    166 #define SND_AUDIOMODE_WMA_LEVEL4             ((__u32) 0x00000008)
    167 #define SND_AUDIOMODE_WMAPRO_LEVELM0         ((__u32) 0x00000010)
    168 #define SND_AUDIOMODE_WMAPRO_LEVELM1         ((__u32) 0x00000020)
    169 #define SND_AUDIOMODE_WMAPRO_LEVELM2         ((__u32) 0x00000040)
    170 #define SND_AUDIOMODE_WMAPRO_LEVELM3         ((__u32) 0x00000080)
    171 
    172 #define SND_AUDIOSTREAMFORMAT_WMA_ASF        ((__u32) 0x00000001)
    173 /*
    174  * Some implementations strip the ASF header and only send ASF packets
    175  * to the DSP
    176  */
    177 #define SND_AUDIOSTREAMFORMAT_WMA_NOASF_HDR  ((__u32) 0x00000002)
    178 
    179 #define SND_AUDIOPROFILE_REALAUDIO           ((__u32) 0x00000001)
    180 
    181 #define SND_AUDIOMODE_REALAUDIO_G2           ((__u32) 0x00000001)
    182 #define SND_AUDIOMODE_REALAUDIO_8            ((__u32) 0x00000002)
    183 #define SND_AUDIOMODE_REALAUDIO_10           ((__u32) 0x00000004)
    184 #define SND_AUDIOMODE_REALAUDIO_SURROUND     ((__u32) 0x00000008)
    185 
    186 #define SND_AUDIOPROFILE_VORBIS              ((__u32) 0x00000001)
    187 
    188 #define SND_AUDIOMODE_VORBIS                 ((__u32) 0x00000001)
    189 
    190 #define SND_AUDIOPROFILE_FLAC                ((__u32) 0x00000001)
    191 
    192 /*
    193  * Define quality levels for FLAC encoders, from LEVEL0 (fast)
    194  * to LEVEL8 (best)
    195  */
    196 #define SND_AUDIOMODE_FLAC_LEVEL0            ((__u32) 0x00000001)
    197 #define SND_AUDIOMODE_FLAC_LEVEL1            ((__u32) 0x00000002)
    198 #define SND_AUDIOMODE_FLAC_LEVEL2            ((__u32) 0x00000004)
    199 #define SND_AUDIOMODE_FLAC_LEVEL3            ((__u32) 0x00000008)
    200 #define SND_AUDIOMODE_FLAC_LEVEL4            ((__u32) 0x00000010)
    201 #define SND_AUDIOMODE_FLAC_LEVEL5            ((__u32) 0x00000020)
    202 #define SND_AUDIOMODE_FLAC_LEVEL6            ((__u32) 0x00000040)
    203 #define SND_AUDIOMODE_FLAC_LEVEL7            ((__u32) 0x00000080)
    204 #define SND_AUDIOMODE_FLAC_LEVEL8            ((__u32) 0x00000100)
    205 
    206 #define SND_AUDIOSTREAMFORMAT_FLAC           ((__u32) 0x00000001)
    207 #define SND_AUDIOSTREAMFORMAT_FLAC_OGG       ((__u32) 0x00000002)
    208 
    209 /* IEC61937 payloads without CUVP and preambles */
    210 #define SND_AUDIOPROFILE_IEC61937            ((__u32) 0x00000001)
    211 /* IEC61937 with S/PDIF preambles+CUVP bits in 32-bit containers */
    212 #define SND_AUDIOPROFILE_IEC61937_SPDIF      ((__u32) 0x00000002)
    213 
    214 /*
    215  * IEC modes are mandatory for decoders. Format autodetection
    216  * will only happen on the DSP side with mode 0. The PCM mode should
    217  * not be used, the PCM codec should be used instead.
    218  */
    219 #define SND_AUDIOMODE_IEC_REF_STREAM_HEADER  ((__u32) 0x00000000)
    220 #define SND_AUDIOMODE_IEC_LPCM		     ((__u32) 0x00000001)
    221 #define SND_AUDIOMODE_IEC_AC3		     ((__u32) 0x00000002)
    222 #define SND_AUDIOMODE_IEC_MPEG1		     ((__u32) 0x00000004)
    223 #define SND_AUDIOMODE_IEC_MP3		     ((__u32) 0x00000008)
    224 #define SND_AUDIOMODE_IEC_MPEG2		     ((__u32) 0x00000010)
    225 #define SND_AUDIOMODE_IEC_AACLC		     ((__u32) 0x00000020)
    226 #define SND_AUDIOMODE_IEC_DTS		     ((__u32) 0x00000040)
    227 #define SND_AUDIOMODE_IEC_ATRAC		     ((__u32) 0x00000080)
    228 #define SND_AUDIOMODE_IEC_SACD		     ((__u32) 0x00000100)
    229 #define SND_AUDIOMODE_IEC_EAC3		     ((__u32) 0x00000200)
    230 #define SND_AUDIOMODE_IEC_DTS_HD	     ((__u32) 0x00000400)
    231 #define SND_AUDIOMODE_IEC_MLP		     ((__u32) 0x00000800)
    232 #define SND_AUDIOMODE_IEC_DST		     ((__u32) 0x00001000)
    233 #define SND_AUDIOMODE_IEC_WMAPRO	     ((__u32) 0x00002000)
    234 #define SND_AUDIOMODE_IEC_REF_CXT            ((__u32) 0x00004000)
    235 #define SND_AUDIOMODE_IEC_HE_AAC	     ((__u32) 0x00008000)
    236 #define SND_AUDIOMODE_IEC_HE_AAC2	     ((__u32) 0x00010000)
    237 #define SND_AUDIOMODE_IEC_MPEG_SURROUND	     ((__u32) 0x00020000)
    238 
    239 #define SND_AUDIOPROFILE_G723_1              ((__u32) 0x00000001)
    240 
    241 #define SND_AUDIOMODE_G723_1_ANNEX_A         ((__u32) 0x00000001)
    242 #define SND_AUDIOMODE_G723_1_ANNEX_B         ((__u32) 0x00000002)
    243 #define SND_AUDIOMODE_G723_1_ANNEX_C         ((__u32) 0x00000004)
    244 
    245 #define SND_AUDIOPROFILE_G729                ((__u32) 0x00000001)
    246 
    247 #define SND_AUDIOMODE_G729_ANNEX_A           ((__u32) 0x00000001)
    248 #define SND_AUDIOMODE_G729_ANNEX_B           ((__u32) 0x00000002)
    249 
    250 /* <FIXME: multichannel encoders aren't supported for now. Would need
    251    an additional definition of channel arrangement> */
    252 
    253 /* VBR/CBR definitions */
    254 #define SND_RATECONTROLMODE_CONSTANTBITRATE  ((__u32) 0x00000001)
    255 #define SND_RATECONTROLMODE_VARIABLEBITRATE  ((__u32) 0x00000002)
    256 
    257 /* Encoder options */
    258 
    259 struct snd_enc_wma {
    260 	__u32 super_block_align; /* WMA Type-specific data */
    261 	__u32 bits_per_sample;
    262 	__u32 channelmask;
    263 	__u32 encodeopt;
    264 	__u32 encodeopt1;
    265 	__u32 encodeopt2;
    266 };
    267 
    268 
    269 /**
    270  * struct snd_enc_vorbis
    271  * @quality: Sets encoding quality to n, between -1 (low) and 10 (high).
    272  * In the default mode of operation, the quality level is 3.
    273  * Normal quality range is 0 - 10.
    274  * @managed: Boolean. Set  bitrate  management  mode. This turns off the
    275  * normal VBR encoding, but allows hard or soft bitrate constraints to be
    276  * enforced by the encoder. This mode can be slower, and may also be
    277  * lower quality. It is primarily useful for streaming.
    278  * @max_bit_rate: Enabled only if managed is TRUE
    279  * @min_bit_rate: Enabled only if managed is TRUE
    280  * @downmix: Boolean. Downmix input from stereo to mono (has no effect on
    281  * non-stereo streams). Useful for lower-bitrate encoding.
    282  *
    283  * These options were extracted from the OpenMAX IL spec and Gstreamer vorbisenc
    284  * properties
    285  *
    286  * For best quality users should specify VBR mode and set quality levels.
    287  */
    288 
    289 struct snd_enc_vorbis {
    290 	__s32 quality;
    291 	__u32 managed;
    292 	__u32 max_bit_rate;
    293 	__u32 min_bit_rate;
    294 	__u32 downmix;
    295 };
    296 
    297 
    298 /**
    299  * struct snd_enc_real
    300  * @quant_bits: number of coupling quantization bits in the stream
    301  * @start_region: coupling start region in the stream
    302  * @num_regions: number of regions value
    303  *
    304  * These options were extracted from the OpenMAX IL spec
    305  */
    306 
    307 struct snd_enc_real {
    308 	__u32 quant_bits;
    309 	__u32 start_region;
    310 	__u32 num_regions;
    311 };
    312 
    313 /**
    314  * struct snd_enc_flac
    315  * @num: serial number, valid only for OGG formats
    316  *	needs to be set by application
    317  * @gain: Add replay gain tags
    318  *
    319  * These options were extracted from the FLAC online documentation
    320  * at http://flac.sourceforge.net/documentation_tools_flac.html
    321  *
    322  * To make the API simpler, it is assumed that the user will select quality
    323  * profiles. Additional options that affect encoding quality and speed can
    324  * be added at a later stage if needed.
    325  *
    326  * By default the Subset format is used by encoders.
    327  *
    328  * TAGS such as pictures, etc, cannot be handled by an offloaded encoder and are
    329  * not supported in this API.
    330  */
    331 
    332 struct snd_enc_flac {
    333 	__u32 num;
    334 	__u32 gain;
    335 };
    336 
    337 struct snd_enc_generic {
    338 	__u32 bw;	/* encoder bandwidth */
    339 	__s32 reserved[15];
    340 };
    341 struct snd_dec_dts {
    342 	__u32 modelIdLength;
    343 	__u8 *modelId;
    344 };
    345 struct snd_dec_ddp {
    346 	__u32 params_length;
    347 	__u8 *params;
    348 	__u32 params_id[18];
    349 	__u32 params_value[18];
    350 };
    351 union snd_codec_options {
    352 	struct snd_enc_wma wma;
    353 	struct snd_enc_vorbis vorbis;
    354 	struct snd_enc_real real;
    355 	struct snd_enc_flac flac;
    356 	struct snd_enc_generic generic;
    357 	struct snd_dec_dts dts;
    358 	struct snd_dec_ddp ddp;
    359 };
    360 
    361 /** struct snd_codec_desc - description of codec capabilities
    362  * @max_ch: Maximum number of audio channels
    363  * @sample_rates: Sampling rates in Hz, use values like 48000 for this
    364  * @num_sample_rates: Number of valid values in sample_rates array
    365  * @bit_rate: Indexed array containing supported bit rates
    366  * @num_bitrates: Number of valid values in bit_rate array
    367  * @rate_control: value is specified by SND_RATECONTROLMODE defines.
    368  * @profiles: Supported profiles. See SND_AUDIOPROFILE defines.
    369  * @modes: Supported modes. See SND_AUDIOMODE defines
    370  * @formats: Supported formats. See SND_AUDIOSTREAMFORMAT defines
    371  * @min_buffer: Minimum buffer size handled by codec implementation
    372  * @reserved: reserved for future use
    373  *
    374  * This structure provides a scalar value for profiles, modes and stream
    375  * format fields.
    376  * If an implementation supports multiple combinations, they will be listed as
    377  * codecs with different descriptors, for example there would be 2 descriptors
    378  * for AAC-RAW and AAC-ADTS.
    379  * This entails some redundancy but makes it easier to avoid invalid
    380  * configurations.
    381  *
    382  */
    383 
    384 struct snd_codec_desc {
    385 	__u32 max_ch;
    386 	__u32 sample_rates[MAX_NUM_SAMPLE_RATES];
    387 	__u32 num_sample_rates;
    388 	__u32 bit_rate[MAX_NUM_BITRATES];
    389 	__u32 num_bitrates;
    390 	__u32 rate_control;
    391 	__u32 profiles;
    392 	__u32 modes;
    393 	__u32 formats;
    394 	__u32 min_buffer;
    395 	__u32 reserved[15];
    396 };
    397 
    398 /** struct snd_codec
    399  * @id: Identifies the supported audio encoder/decoder.
    400  *		See SND_AUDIOCODEC macros.
    401  * @ch_in: Number of input audio channels
    402  * @ch_out: Number of output channels. In case of contradiction between
    403  *		this field and the channelMode field, the channelMode field
    404  *		overrides.
    405  * @sample_rate: Audio sample rate of input data in Hz, use values like 48000
    406  *             for this.
    407  * @bit_rate: Bitrate of encoded data. May be ignored by decoders
    408  * @rate_control: Encoding rate control. See SND_RATECONTROLMODE defines.
    409  *               Encoders may rely on profiles for quality levels.
    410  *		 May be ignored by decoders.
    411  * @profile: Mandatory for encoders, can be mandatory for specific
    412  *		decoders as well. See SND_AUDIOPROFILE defines.
    413  * @level: Supported level (Only used by WMA at the moment)
    414  * @ch_mode: Channel mode for encoder. See SND_AUDIOCHANMODE defines
    415  * @format: Format of encoded bistream. Mandatory when defined.
    416  *		See SND_AUDIOSTREAMFORMAT defines.
    417  * @align: Block alignment in bytes of an audio sample.
    418  *		Only required for PCM or IEC formats.
    419  * @options: encoder-specific settings
    420  * @reserved: reserved for future use
    421  */
    422 
    423 struct snd_codec {
    424 	__u32 id;
    425 	__u32 ch_in;
    426 	__u32 ch_out;
    427 	__u32 sample_rate;
    428 	__u32 bit_rate;
    429 	__u32 rate_control;
    430 	__u32 profile;
    431 	__u32 level;
    432 	__u32 ch_mode;
    433 	__u32 format;
    434 	__u32 align;
    435 	__u32 transcode_dts;
    436 	__u32 compr_passthr;
    437 	struct snd_dec_dts dts;
    438 	union snd_codec_options options;
    439 	__u32 reserved[3];
    440 };
    441 
    442 #endif
    443