ffmpeg_decoder_t Struct Reference

FFmpeg decoder state for video and audio decoding. More...

Data Fields
AVFormatContext *	format_ctx
	FFmpeg format/container context.
AVCodecContext *	video_codec_ctx
	Video codec context.
int	video_stream_idx
	Video stream index (-1 if none)
struct SwsContext *	sws_ctx
	Software scaler for format conversion.
AVCodecContext *	audio_codec_ctx
	Audio codec context.
int	audio_stream_idx
	Audio stream index (-1 if none)
struct SwrContext *	swr_ctx
	Software resampler for format conversion.
AVFrame *	frame
	Reusable frame for decoding.
AVPacket *	packet
	Reusable packet for reading.
image_t *	current_image
	Working buffer for decoding.
float *	audio_buffer
	Buffer for partial audio frames.
size_t	audio_buffer_size
	Total size of audio buffer.
size_t	audio_buffer_offset
	Current offset in audio buffer.
asciichat_thread_t	prefetch_thread
	Prefetch thread handle.
image_t *	prefetch_image_a
	First prefetch buffer.
image_t *	prefetch_image_b
	Second prefetch buffer.
image_t *	current_prefetch_image
	Currently available prefetched frame.
bool	prefetch_frame_ready
	Whether current_prefetch_image has valid data.
bool	prefetch_thread_running
	Whether prefetch thread is active.
bool	prefetch_should_stop
	Signal to stop prefetch thread.
bool	seeking_in_progress
	Signal to pause prefetch thread during seek.
cond_t	prefetch_cond
	Condition variable for pausing during seek.
mutex_t	prefetch_mutex
	Protect prefetch state and FFmpeg decoder access.
image_t *	current_read_buffer
	Buffer main thread is currently reading/rendering.
bool	buffer_a_in_use
	Whether prefetch_image_a is being read by main thread.
bool	buffer_b_in_use
	Whether prefetch_image_b is being read by main thread.
bool	eof_reached
	Whether end of file was reached.
bool	is_stdin
	Whether reading from stdin.
AVIOContext *	avio_ctx
	Custom I/O context for stdin.
unsigned char *	avio_buffer
	Buffer for custom I/O.
double	last_video_pts
	Last video presentation timestamp.
double	last_audio_pts
	Last audio presentation timestamp.
uint64_t	audio_samples_read
	Total audio samples decoded and output.
int	audio_sample_rate
	Audio sample rate (Hz)

Detailed Description

FFmpeg decoder state for video and audio decoding.

Handles video/audio decoding from files, stdin, and URLs using FFmpeg. Supports double-buffered prefetching for smooth playback.

Definition at line 66 of file ffmpeg_decoder.c.

Field Documentation

audio_buffer

float* ffmpeg_decoder_t::audio_buffer

Buffer for partial audio frames.

Definition at line 88 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_destroy(), ffmpeg_decoder_read_audio_samples(), and ffmpeg_decoder_seek_to_timestamp().

audio_buffer_offset

size_t ffmpeg_decoder_t::audio_buffer_offset

Current offset in audio buffer.

Definition at line 90 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_read_audio_samples(), ffmpeg_decoder_rewind(), and ffmpeg_decoder_seek_to_timestamp().

audio_buffer_size

size_t ffmpeg_decoder_t::audio_buffer_size

Total size of audio buffer.

Definition at line 89 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), and ffmpeg_decoder_seek_to_timestamp().

audio_codec_ctx

AVCodecContext* ffmpeg_decoder_t::audio_codec_ctx

Audio codec context.

Definition at line 76 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_destroy(), ffmpeg_decoder_read_audio_samples(), ffmpeg_decoder_rewind(), and ffmpeg_decoder_seek_to_timestamp().

audio_sample_rate

int ffmpeg_decoder_t::audio_sample_rate

Audio sample rate (Hz)

Definition at line 123 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_get_position(), and ffmpeg_decoder_seek_to_timestamp().

audio_samples_read

uint64_t ffmpeg_decoder_t::audio_samples_read

Total audio samples decoded and output.

Definition at line 122 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_get_position(), ffmpeg_decoder_read_audio_samples(), ffmpeg_decoder_rewind(), and ffmpeg_decoder_seek_to_timestamp().

audio_stream_idx

int ffmpeg_decoder_t::audio_stream_idx

Audio stream index (-1 if none)

Definition at line 77 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_has_audio(), and ffmpeg_decoder_read_audio_samples().

avio_buffer

unsigned char* ffmpeg_decoder_t::avio_buffer

Buffer for custom I/O.

Definition at line 115 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create_stdin().

avio_ctx

AVIOContext* ffmpeg_decoder_t::avio_ctx

Custom I/O context for stdin.

Definition at line 114 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create_stdin(), and ffmpeg_decoder_destroy().

buffer_a_in_use

bool ffmpeg_decoder_t::buffer_a_in_use

Whether prefetch_image_a is being read by main thread.

Definition at line 106 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_read_video_frame(), and ffmpeg_decoder_seek_to_timestamp().

buffer_b_in_use

bool ffmpeg_decoder_t::buffer_b_in_use

Whether prefetch_image_b is being read by main thread.

Definition at line 107 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_read_video_frame(), and ffmpeg_decoder_seek_to_timestamp().

current_image

image_t* ffmpeg_decoder_t::current_image

Working buffer for decoding.

Definition at line 85 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_destroy(), and ffmpeg_decoder_read_video_frame().

current_prefetch_image

image_t* ffmpeg_decoder_t::current_prefetch_image

Currently available prefetched frame.

Definition at line 96 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), and ffmpeg_decoder_read_video_frame().

current_read_buffer

image_t* ffmpeg_decoder_t::current_read_buffer

Buffer main thread is currently reading/rendering.

Definition at line 105 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_read_video_frame(), and ffmpeg_decoder_seek_to_timestamp().

eof_reached

bool ffmpeg_decoder_t::eof_reached

Whether end of file was reached.

Definition at line 110 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_at_end(), ffmpeg_decoder_read_audio_samples(), ffmpeg_decoder_rewind(), and ffmpeg_decoder_seek_to_timestamp().

format_ctx

AVFormatContext* ffmpeg_decoder_t::format_ctx

FFmpeg format/container context.

Definition at line 68 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_destroy(), ffmpeg_decoder_get_duration(), ffmpeg_decoder_get_video_fps(), ffmpeg_decoder_read_audio_samples(), ffmpeg_decoder_rewind(), and ffmpeg_decoder_seek_to_timestamp().

frame

AVFrame* ffmpeg_decoder_t::frame

Reusable frame for decoding.

Definition at line 81 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_destroy(), and ffmpeg_decoder_read_audio_samples().

is_stdin

bool ffmpeg_decoder_t::is_stdin

Whether reading from stdin.

Definition at line 111 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create_stdin(), ffmpeg_decoder_rewind(), and ffmpeg_decoder_seek_to_timestamp().

last_audio_pts

double ffmpeg_decoder_t::last_audio_pts

Last audio presentation timestamp.

Definition at line 119 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_get_position(), ffmpeg_decoder_read_audio_samples(), ffmpeg_decoder_rewind(), and ffmpeg_decoder_seek_to_timestamp().

last_video_pts

double ffmpeg_decoder_t::last_video_pts

Last video presentation timestamp.

Definition at line 118 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_get_position(), ffmpeg_decoder_rewind(), and ffmpeg_decoder_seek_to_timestamp().

packet

AVPacket* ffmpeg_decoder_t::packet

Reusable packet for reading.

Definition at line 82 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_destroy(), and ffmpeg_decoder_read_audio_samples().

prefetch_cond

cond_t ffmpeg_decoder_t::prefetch_cond

Condition variable for pausing during seek.

Definition at line 101 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_destroy(), and ffmpeg_decoder_seek_to_timestamp().

prefetch_frame_ready

bool ffmpeg_decoder_t::prefetch_frame_ready

Whether current_prefetch_image has valid data.

Definition at line 97 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_read_video_frame(), and ffmpeg_decoder_seek_to_timestamp().

prefetch_image_a

image_t* ffmpeg_decoder_t::prefetch_image_a

First prefetch buffer.

Definition at line 94 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_destroy(), ffmpeg_decoder_read_video_frame(), and ffmpeg_decoder_start_prefetch().

prefetch_image_b

image_t* ffmpeg_decoder_t::prefetch_image_b

Second prefetch buffer.

Definition at line 95 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_destroy(), ffmpeg_decoder_read_video_frame(), and ffmpeg_decoder_start_prefetch().

prefetch_mutex

mutex_t ffmpeg_decoder_t::prefetch_mutex

Protect prefetch state and FFmpeg decoder access.

Definition at line 102 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_destroy(), ffmpeg_decoder_read_video_frame(), and ffmpeg_decoder_seek_to_timestamp().

prefetch_should_stop

bool ffmpeg_decoder_t::prefetch_should_stop

Signal to stop prefetch thread.

Definition at line 99 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_destroy(), ffmpeg_decoder_start_prefetch(), and ffmpeg_decoder_stop_prefetch().

prefetch_thread

asciichat_thread_t ffmpeg_decoder_t::prefetch_thread

Prefetch thread handle.

Definition at line 93 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_destroy(), ffmpeg_decoder_start_prefetch(), and ffmpeg_decoder_stop_prefetch().

prefetch_thread_running

bool ffmpeg_decoder_t::prefetch_thread_running

Whether prefetch thread is active.

Definition at line 98 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_destroy(), ffmpeg_decoder_is_prefetch_running(), ffmpeg_decoder_start_prefetch(), and ffmpeg_decoder_stop_prefetch().

seeking_in_progress

bool ffmpeg_decoder_t::seeking_in_progress

Signal to pause prefetch thread during seek.

Definition at line 100 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_seek_to_timestamp().

swr_ctx

struct SwrContext* ffmpeg_decoder_t::swr_ctx

Software resampler for format conversion.

Definition at line 78 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_destroy(), and ffmpeg_decoder_read_audio_samples().

sws_ctx

struct SwsContext* ffmpeg_decoder_t::sws_ctx

Software scaler for format conversion.

Definition at line 73 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), and ffmpeg_decoder_destroy().

video_codec_ctx

AVCodecContext* ffmpeg_decoder_t::video_codec_ctx

Video codec context.

Definition at line 71 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_destroy(), ffmpeg_decoder_get_video_dimensions(), ffmpeg_decoder_rewind(), and ffmpeg_decoder_seek_to_timestamp().

video_stream_idx

int ffmpeg_decoder_t::video_stream_idx

Video stream index (-1 if none)

Definition at line 72 of file ffmpeg_decoder.c.

Referenced by ffmpeg_decoder_create(), ffmpeg_decoder_create_stdin(), ffmpeg_decoder_get_video_dimensions(), ffmpeg_decoder_get_video_fps(), ffmpeg_decoder_has_video(), ffmpeg_decoder_read_video_frame(), and ffmpeg_decoder_start_prefetch().

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The documentation for this struct was generated from the following file:

• ffmpeg_decoder.c