FFmpeg: libavutil/channel_layout.c File Reference

FFmpeg

libavutil

channel_layout.c File Reference

audio channel layout utility functions More...

#include <stdint.h>
#include "avstring.h"
#include "avutil.h"
#include "channel_layout.h"
#include "bprint.h"
#include "common.h"

Go to the source code of this file.

Data Structures

struct channel_name

Functions

static const char * get_channel_name (int channel_id)

static uint64_t get_channel_layout_single (const char *name, int name_len, int compat)

uint64_t ff_get_channel_layout (const char *name, int compat)

uint64_t av_get_channel_layout (const char *name)

Return a channel layout id that matches name, or 0 if no match is found.

void av_bprint_channel_layout (struct AVBPrint *bp, int nb_channels, uint64_t channel_layout)

Append a description of a channel layout to a bprint buffer.

void av_get_channel_layout_string (char *buf, int buf_size, int nb_channels, uint64_t channel_layout)

Return a description of a channel layout.

int av_get_channel_layout_nb_channels (uint64_t channel_layout)

Return the number of channels in the channel layout.

int64_t av_get_default_channel_layout (int nb_channels)

Return default channel layout for a given number of channels.

int av_get_channel_layout_channel_index (uint64_t channel_layout, uint64_t channel)

Get the index of a channel in channel_layout.

const char * av_get_channel_name (uint64_t channel)

Get the name of a given channel.

const char * av_get_channel_description (uint64_t channel)

Get the description of a given channel.

uint64_t av_channel_layout_extract_channel (uint64_t channel_layout, int index)

Get the channel with the given index in channel_layout.

int av_get_standard_channel_layout (unsigned index, uint64_t *layout, const char **name)

Get the value and name of a standard channel layout.

Variables

static struct channel_name channel_names []

struct {

const char * name

int nb_channels

uint64_t layout

} channel_layout_map []

Detailed Description

audio channel layout utility functions

Definition in file channel_layout.c.

Function Documentation

static const char* get_channel_name ( int channel_id )

static

Definition at line 67 of file channel_layout.c.

Referenced by av_bprint_channel_layout(), and av_get_channel_name().

static uint64_t get_channel_layout_single ( const char * name,

int name_len,

int compat

)

static

Definition at line 109 of file channel_layout.c.

Referenced by ff_get_channel_layout().

uint64_t ff_get_channel_layout ( const char * name,

int compat

)

Definition at line 159 of file channel_layout.c.

Referenced by av_get_channel_layout(), and av_opt_set().

Variable Documentation

struct channel_name channel_names[]

static

Initial value:

= {

[0] = { "FL", "front left" },

[1] = { "FR", "front right" },

[2] = { "FC", "front center" },

[3] = { "LFE", "low frequency" },

[4] = { "BL", "back left" },

[5] = { "BR", "back right" },

[6] = { "FLC", "front left-of-center" },

[7] = { "FRC", "front right-of-center" },

[8] = { "BC", "back center" },

[9] = { "SL", "side left" },

[10] = { "SR", "side right" },

[11] = { "TC", "top center" },

[12] = { "TFL", "top front left" },

[13] = { "TFC", "top front center" },

[14] = { "TFR", "top front right" },

[15] = { "TBL", "top back left" },

[16] = { "TBC", "top back center" },

[17] = { "TBR", "top back right" },

[29] = { "DL", "downmix left" },

[30] = { "DR", "downmix right" },

[31] = { "WL", "wide left" },

[32] = { "WR", "wide right" },

[33] = { "SDL", "surround direct left" },

[34] = { "SDR", "surround direct right" },

[35] = { "LFE2", "low frequency 2" },

}

Definition at line 39 of file channel_layout.c.

const char* name

Definition at line 75 of file channel_layout.c.

int nb_channels

Examples:: avcodec.c, muxing.c, and resampling_audio.c.

Definition at line 76 of file channel_layout.c.

Referenced by av_buffersink_get_samples(), av_samples_copy(), av_samples_fill_arrays(), av_samples_set_silence(), buffer_offset(), celt_header(), channelmap_config_input(), config_audio_output(), ff_filter_frame_needs_framing(), ff_mpa_l2_select_table(), fill_coding_method_array(), fill_samples(), filter_frame(), get_audio_frame(), init(), main(), MPA_encode_frame(), return_audio_frame(), select_channel_layout(), send_silence(), and stream_component_open().

uint64_t layout

Definition at line 77 of file channel_layout.c.

Referenced by av_bprint_channel_layout(), clean_layout(), count_channels(), encode_init(), ff_alsa_open(), ff_get_channel_layout(), ff_mov_get_channel_layout_tag(), ff_truehd_layout(), filter_frame(), get_channel_layout_single(), mjpeg_decode_app(), mxf_read_pixel_layout(), opt_channel_layout(), output_configure(), parse_channel_name(), print_link_prop(), query_formats(), show_layouts(), and sniff_channel_order().

struct { ... } channel_layout_map[]

Initial value:

= {

{ "mono", 1, AV_CH_LAYOUT_MONO },

{ "stereo", 2, AV_CH_LAYOUT_STEREO },

{ "2.1", 3, AV_CH_LAYOUT_2POINT1 },

{ "3.0", 3, AV_CH_LAYOUT_SURROUND },

{ "3.0(back)", 3, AV_CH_LAYOUT_2_1 },

{ "4.0", 4, AV_CH_LAYOUT_4POINT0 },

{ "quad", 4, AV_CH_LAYOUT_QUAD },

{ "quad(side)", 4, AV_CH_LAYOUT_2_2 },

{ "3.1", 4, AV_CH_LAYOUT_3POINT1 },

{ "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK },

{ "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 },

{ "4.1", 5, AV_CH_LAYOUT_4POINT1 },

{ "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK },

{ "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 },

{ "6.0", 6, AV_CH_LAYOUT_6POINT0 },

{ "6.0(front)", 6, AV_CH_LAYOUT_6POINT0_FRONT },

{ "hexagonal", 6, AV_CH_LAYOUT_HEXAGONAL },

{ "6.1", 7, AV_CH_LAYOUT_6POINT1 },

{ "6.1", 7, AV_CH_LAYOUT_6POINT1_BACK },

{ "6.1(front)", 7, AV_CH_LAYOUT_6POINT1_FRONT },

{ "7.0", 7, AV_CH_LAYOUT_7POINT0 },

{ "7.0(front)", 7, AV_CH_LAYOUT_7POINT0_FRONT },

{ "7.1", 8, AV_CH_LAYOUT_7POINT1 },

{ "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE_BACK },

{ "7.1(wide-side)", 8, AV_CH_LAYOUT_7POINT1_WIDE },

{ "octagonal", 8, AV_CH_LAYOUT_OCTAGONAL },

{ "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, },

}

Referenced by av_bprint_channel_layout(), av_get_default_channel_layout(), av_get_standard_channel_layout(), and get_channel_layout_single().

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