Audio related
[Common utility functions]

Modules
	Audio channel masks
	Audio channel convenience macros
Functions
uint64_t	av_get_channel_layout (const char *name)
	Return a channel layout id that matches name, 0 if no match.
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.

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Function Documentation

uint64_t av_get_channel_layout

(

const char *

name

)

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

name can be one or several of the following notations, separated by '+' or '|':

• the name of an usual channel layout (mono, stereo, 4.0, quad, 5.0, 5.0(side), 5.1, 5.1(side), 7.1, 7.1(wide), downmix);
• the name of a single channel (FL, FR, FC, LFE, BL, BR, FLC, FRC, BC, SL, SR, TC, TFL, TFC, TFR, TBL, TBC, TBR, DL, DR);
• a number of channels, in decimal, optionnally followed by 'c', yielding the default channel layout for that number of channels (

  See also:

  av_get_default_channel_layout);

• a channel layout mask, in hexadecimal starting with "0x" (see the AV_CH_* macros). + Example: "stereo+FC" = "2+FC" = "2c+1c" = "0x7"

Definition at line 105 of file audioconvert.c.

Referenced by avcodec_get_channel_layout(), ff_parse_channel_layout(), init(), and parse_channel_name().

int av_get_channel_layout_nb_channels

(

uint64_t

channel_layout

)

Return the number of channels in the channel layout.

Definition at line 155 of file audioconvert.c.

Referenced by audio_decode_frame(), av_asrc_buffer_add_buffer(), av_get_channel_layout_string(), avcodec_channel_layout_num_channels(), avcodec_open2(), avfilter_default_get_audio_buffer(), config_output(), config_props(), ff_mov_get_channel_layout_tag(), filter_samples(), init(), init_buffers(), lavfi_read_header(), lavfi_read_packet(), main(), read_major_sync(), sane_layout(), stream_component_open(), swr_alloc_set_opts(), swr_init(), swri_rematrix(), swri_rematrix_init(), transcode_init(), and uninit().

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.

If nb_channels is <= 0, it is guessed from the channel_layout.

Parameters:

	buf	put here the string containing the channel layout
	buf_size	size in bytes of the buffer

Definition at line 121 of file audioconvert.c.

Referenced by avcodec_get_channel_layout_string(), avcodec_string(), config_output(), config_props(), dprint_options(), ff_alsa_open(), ff_dlog_link(), filter_samples(), init(), log_input_change(), oggvorbis_init_encoder(), and print_digraph().

int64_t av_get_default_channel_layout

(

int

nb_channels

)

Return default channel layout for a given number of channels.

Definition at line 164 of file audioconvert.c.

Referenced by audio_decode_frame(), do_audio_out(), get_channel_layout_single(), init(), stream_component_open(), swr_init(), and transcode_init().