libavcodec/ac3tab.c File Reference

tables taken directly from the AC-3 spec. More...

#include "libavutil/audioconvert.h"
#include "avcodec.h"
#include "ac3tab.h"

Go to the source code of this file.

Defines

#define COMMON_CHANNEL_MAP

Variables

const uint16_t ff_ac3_frame_size_tab [38][3]
 Possible frame sizes.
const uint8_t ff_ac3_channels_tab [8]
 Map audio coding mode (acmod) to number of full-bandwidth channels.
const uint16_t avpriv_ac3_channel_layout_tab [8]
 Map audio coding mode (acmod) to channel layout mask.
const uint8_t ff_ac3_enc_channel_map [8][2][6]
 Table to remap channels from SMPTE order to AC-3 order.
const uint8_t ff_ac3_dec_channel_map [8][2][6]
 Table to remap channels from from AC-3 order to SMPTE order.
const uint16_t ff_ac3_sample_rate_tab [3] = { 48000, 44100, 32000 }
const uint16_t ff_ac3_bitrate_tab [19]
const uint8_t ff_ac3_rematrix_band_tab [5] = { 13, 25, 37, 61, 253 }
 Table of bin locations for rematrixing bands reference: Section 7.5.2 Rematrixing : Frequency Band Definitions.
const uint8_t ff_eac3_default_cpl_band_struct [18]
 Table E2.16 Default Coupling Banding Structure.
const int16_t ff_ac3_window [AC3_WINDOW_SIZE/2]
const uint8_t ff_ac3_log_add_tab [260]
const uint16_t ff_ac3_hearing_threshold_tab [AC3_CRITICAL_BANDS][3]
const uint8_t ff_ac3_bap_tab [64]
const uint8_t ff_ac3_slow_decay_tab [4]
const uint8_t ff_ac3_fast_decay_tab [4]
const uint16_t ff_ac3_slow_gain_tab [4]
const uint16_t ff_ac3_db_per_bit_tab [4]
const int16_t ff_ac3_floor_tab [8]
const uint16_t ff_ac3_fast_gain_tab [8]
const uint16_t ff_eac3_default_chmap [8]
 Default channel map for a dependent substream defined by acmod.

Detailed Description

tables taken directly from the AC-3 spec.

Definition in file ac3tab.c.

Define Documentation

#define COMMON_CHANNEL_MAP

Value:

{ { 0, 1,          }, { 0, 1, 2,         } },\
    { { 0,             }, { 0, 1,            } },\
    { { 0, 1,          }, { 0, 1, 2,         } },\
    { { 0, 2, 1,       }, { 0, 2, 1, 3,      } },\
    { { 0, 1, 2,       }, { 0, 1, 3, 2,      } },\
    { { 0, 2, 1, 3,    }, { 0, 2, 1, 4, 3,   } },

Definition at line 98 of file ac3tab.c.

Variable Documentation

const uint16_t avpriv_ac3_channel_layout_tab[8]

Initial value:

 {
    AV_CH_LAYOUT_STEREO,
    AV_CH_LAYOUT_MONO,
    AV_CH_LAYOUT_STEREO,
    AV_CH_LAYOUT_SURROUND,
    AV_CH_LAYOUT_2_1,
    AV_CH_LAYOUT_4POINT0,
    AV_CH_LAYOUT_2_2,
    AV_CH_LAYOUT_5POINT0
}
Map audio coding mode (acmod) to channel layout mask.

Definition at line 87 of file ac3tab.c.

Referenced by ac3_decode_frame(), avpriv_ac3_parse_header(), mov_read_dac3(), and mov_read_dec3().

const uint8_t ff_ac3_bap_tab[64]

Initial value:

 {
    0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
    3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
    7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
    9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
    12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
    14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
    15, 15, 15, 15,
}

Definition at line 268 of file ac3tab.c.

Referenced by bit_alloc(), and decode_audio_block().

const uint16_t ff_ac3_bitrate_tab[19]

Initial value:

 {
    32, 40, 48, 56, 64, 80, 96, 112, 128,
    160, 192, 224, 256, 320, 384, 448, 512, 576, 640
}

Definition at line 130 of file ac3tab.c.

Referenced by avpriv_ac3_parse_header(), and validate_options().

const uint8_t ff_ac3_channels_tab[8]

Initial value:

 {
    2, 1, 2, 3, 3, 4, 4, 5
}
Map audio coding mode (acmod) to number of full-bandwidth channels.

from ATSC A/52 Table 5.8 Audio Coding Mode

Definition at line 80 of file ac3tab.c.

Referenced by avpriv_ac3_parse_header().

const uint16_t ff_ac3_db_per_bit_tab[4]

Initial value:

 {
    0x000, 0x700, 0x900, 0xb00,
}

Definition at line 290 of file ac3tab.c.

Referenced by bit_alloc_init(), decode_audio_block(), and ff_eac3_parse_header().

const uint8_t ff_ac3_dec_channel_map[8][2][6]

Initial value:

 {
    COMMON_CHANNEL_MAP
    { { 0, 1, 2, 3,    }, { 0, 1, 4, 2, 3,   } },
    { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } },
}
Table to remap channels from from AC-3 order to SMPTE order.

[channel_mode][lfe][ch]

Definition at line 120 of file ac3tab.c.

Referenced by ac3_decode_frame().

const uint8_t ff_ac3_enc_channel_map[8][2][6]

Initial value:

 {
    COMMON_CHANNEL_MAP
    { { 0, 1, 2, 3,    }, { 0, 1, 3, 4, 2,   } },
    { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
}
Table to remap channels from SMPTE order to AC-3 order.

[channel_mode][lfe][ch]

Definition at line 110 of file ac3tab.c.

Referenced by set_channel_info().

const uint8_t ff_ac3_fast_decay_tab[4]

Initial value:

{
    0x3f, 0x53, 0x67, 0x7b,
}

Definition at line 282 of file ac3tab.c.

Referenced by bit_alloc_init(), decode_audio_block(), and ff_eac3_parse_header().

const uint16_t ff_ac3_fast_gain_tab[8]

Initial value:

 {
    0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
}

Definition at line 298 of file ac3tab.c.

Referenced by bit_alloc_masking(), and decode_audio_block().

const int16_t ff_ac3_floor_tab[8]

Initial value:

 {
    0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
}

Definition at line 294 of file ac3tab.c.

Referenced by bit_alloc_init(), decode_audio_block(), and ff_eac3_parse_header().

const uint16_t ff_ac3_frame_size_tab[38][3]

Possible frame sizes.

from ATSC A/52 Table 5.18 Frame Size Code Table.

Definition at line 35 of file ac3tab.c.

Referenced by avpriv_ac3_parse_header(), and validate_options().

const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]

Definition at line 215 of file ac3tab.c.

Referenced by ff_ac3_bit_alloc_calc_mask().

const uint8_t ff_ac3_log_add_tab[260]

Initial value:

 {
0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
}

Definition at line 186 of file ac3tab.c.

Referenced by ff_ac3_bit_alloc_calc_psd().

const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 }

Table of bin locations for rematrixing bands reference: Section 7.5.2 Rematrixing : Frequency Band Definitions.

Definition at line 139 of file ac3tab.c.

Referenced by compute_rematrixing_strategy(), do_rematrixing(), and ff_ac3_apply_rematrixing().

const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 }

Definition at line 127 of file ac3tab.c.

Referenced by avpriv_ac3_parse_header(), and validate_options().

const uint8_t ff_ac3_slow_decay_tab[4]

Initial value:

{
    0x0f, 0x11, 0x13, 0x15,
}

Definition at line 278 of file ac3tab.c.

Referenced by bit_alloc_init(), decode_audio_block(), and ff_eac3_parse_header().

const uint16_t ff_ac3_slow_gain_tab[4]

Initial value:

 {
    0x540, 0x4d8, 0x478, 0x410,
}

Definition at line 286 of file ac3tab.c.

Referenced by bit_alloc_init(), decode_audio_block(), and ff_eac3_parse_header().

const int16_t ff_ac3_window[AC3_WINDOW_SIZE/2]

Definition at line 151 of file ac3tab.c.

Referenced by mdct_init().

const uint16_t ff_eac3_default_chmap[8]

Initial value:

 {
    AC3_CHMAP_L |               AC3_CHMAP_R, 
                  AC3_CHMAP_C,
    AC3_CHMAP_L |               AC3_CHMAP_R,
    AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R,
    AC3_CHMAP_L |               AC3_CHMAP_R |                   AC3_CHMAP_C_SUR,
    AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R |                   AC3_CHMAP_C_SUR,
    AC3_CHMAP_L |               AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR,
    AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR
}
Default channel map for a dependent substream defined by acmod.

Definition at line 305 of file ac3tab.c.

const uint8_t ff_eac3_default_cpl_band_struct[18]

Initial value:

 {
    0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1
}
Table E2.16 Default Coupling Banding Structure.

Definition at line 144 of file ac3tab.c.

Referenced by decode_audio_block(), output_audio_block(), and set_bandwidth().

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