FFmpeg: doc/examples/demuxing_decoding.c File Reference

FFmpeg 4.2.2

Demuxing and decoding example. More...

#include <libavutil/imgutils.h>
#include <libavutil/samplefmt.h>
#include <libavutil/timestamp.h>
#include <libavformat/avformat.h>

Go to the source code of this file.

Functions
static int	decode_packet (int *got_frame, int cached)

static int	open_codec_context (int stream_idx, AVCodecContext dec_ctx, AVFormatContext fmt_ctx, enum AVMediaType type)

static int	get_format_from_sample_fmt (const char **fmt, enum AVSampleFormat sample_fmt)

int	main (int argc, char **argv)

Variables
static AVFormatContext *	fmt_ctx = NULL

static AVCodecContext *	video_dec_ctx = NULL

static AVCodecContext *	audio_dec_ctx

static int	width

static int	height

static enum AVPixelFormat	pix_fmt

static AVStream *	video_stream = NULL

static AVStream *	audio_stream = NULL

static const char *	src_filename = NULL

static const char *	video_dst_filename = NULL

static const char *	audio_dst_filename = NULL

static FILE *	video_dst_file = NULL

static FILE *	audio_dst_file = NULL

static uint8_t *	video_dst_data [4] = {NULL}

static int	video_dst_linesize [4]

static int	video_dst_bufsize

static int	video_stream_idx = -1

static int	audio_stream_idx = -1

static AVFrame *	frame = NULL

static AVPacket	pkt

static int	video_frame_count = 0

static int	audio_frame_count = 0

static int	refcount = 0

Detailed Description

Demuxing and decoding example.

Show how to use the libavformat and libavcodec API to demux and decode audio and video data.

Definition in file demuxing_decoding.c.

Function Documentation

◆ decode_packet()

static int decode_packet	(	int *	got_frame,
		int	cached
	)

static

Examples:: demuxing_decoding.c.

Definition at line 64 of file demuxing_decoding.c.

Referenced by main().

◆ open_codec_context()

static int open_codec_context	(	int *	stream_idx,
		AVCodecContext **	dec_ctx,
		AVFormatContext *	fmt_ctx,
		enum AVMediaType	type
	)

static

Examples:: demuxing_decoding.c.

Definition at line 149 of file demuxing_decoding.c.

Referenced by main().

◆ get_format_from_sample_fmt()

static int get_format_from_sample_fmt	(	const char **	fmt,
		enum AVSampleFormat	sample_fmt
	)

static

Examples:: demuxing_decoding.c.

Definition at line 202 of file demuxing_decoding.c.

Referenced by main().

◆ main()

int main	(	int	argc,
		char **	argv
	)

Examples:: demuxing_decoding.c.

Definition at line 231 of file demuxing_decoding.c.

Variable Documentation

◆ fmt_ctx

AVFormatContext* fmt_ctx = NULL

static

Examples:: avio_reading.c, demuxing_decoding.c, metadata.c, muxing.c, and remuxing.c.

Definition at line 37 of file demuxing_decoding.c.

Referenced by main().

◆ video_dec_ctx

AVCodecContext* video_dec_ctx = NULL

static

Examples:: demuxing_decoding.c.

Definition at line 38 of file demuxing_decoding.c.

◆ audio_dec_ctx

AVCodecContext * audio_dec_ctx

static

Examples:: demuxing_decoding.c.

Definition at line 38 of file demuxing_decoding.c.

Referenced by decode_packet(), and main().

◆ width

int width

static

Examples:: demuxing_decoding.c, muxing.c, and scaling_video.c.

Definition at line 39 of file demuxing_decoding.c.

Referenced by alloc_picture(), decode_packet(), fill_yuv_image(), and main().

◆ height

int height

static

Examples:: demuxing_decoding.c, muxing.c, and scaling_video.c.

Definition at line 39 of file demuxing_decoding.c.

Referenced by alloc_picture(), decode_packet(), fill_yuv_image(), and main().

◆ pix_fmt

enum AVPixelFormat pix_fmt

static

Examples:: demuxing_decoding.c, and muxing.c.

Definition at line 40 of file demuxing_decoding.c.

Referenced by alloc_picture(), decode_packet(), and main().

◆ video_stream

AVStream* video_stream = NULL

static

Examples:: demuxing_decoding.c, and hw_decode.c.

Definition at line 41 of file demuxing_decoding.c.

Referenced by main().

◆ audio_stream

AVStream * audio_stream = NULL

static

Examples:: demuxing_decoding.c.

Definition at line 41 of file demuxing_decoding.c.

Referenced by main().

◆ src_filename

const char* src_filename = NULL

static

Examples:: demuxing_decoding.c.

Definition at line 42 of file demuxing_decoding.c.

Referenced by main(), and open_codec_context().

◆ video_dst_filename

const char* video_dst_filename = NULL

static

Examples:: demuxing_decoding.c.

Definition at line 43 of file demuxing_decoding.c.

Referenced by main().

◆ audio_dst_filename

const char* audio_dst_filename = NULL

static

Examples:: demuxing_decoding.c.

Definition at line 44 of file demuxing_decoding.c.

Referenced by main().

◆ video_dst_file

FILE* video_dst_file = NULL

static

Examples:: demuxing_decoding.c.

Definition at line 45 of file demuxing_decoding.c.

Referenced by decode_packet(), and main().

◆ audio_dst_file

FILE* audio_dst_file = NULL

static

Examples:: demuxing_decoding.c.

Definition at line 46 of file demuxing_decoding.c.

Referenced by decode_packet(), and main().

◆ video_dst_data

uint8_t* video_dst_data[4] = {NULL}

static

Examples:: demuxing_decoding.c.

Definition at line 48 of file demuxing_decoding.c.

Referenced by decode_packet(), and main().

◆ video_dst_linesize

int video_dst_linesize[4]

static

Examples:: demuxing_decoding.c.

Definition at line 49 of file demuxing_decoding.c.

Referenced by decode_packet(), and main().

◆ video_dst_bufsize

int video_dst_bufsize

static

Examples:: demuxing_decoding.c.

Definition at line 50 of file demuxing_decoding.c.

Referenced by decode_packet(), and main().

◆ video_stream_idx

int video_stream_idx = -1

static

Examples:: demuxing_decoding.c.

Definition at line 52 of file demuxing_decoding.c.

Referenced by decode_packet(), and main().

◆ audio_stream_idx

int audio_stream_idx = -1

static

Examples:: demuxing_decoding.c.

Definition at line 52 of file demuxing_decoding.c.

Referenced by decode_packet(), and main().

◆ frame

AVFrame* frame = NULL

static

Examples:: decode_audio.c, decode_video.c, demuxing_decoding.c, encode_audio.c, encode_video.c, filter_audio.c, filtering_audio.c, filtering_video.c, hw_decode.c, transcode_aac.c, and transcoding.c.

Definition at line 53 of file demuxing_decoding.c.

Referenced by decode_write(), and main().

◆ pkt

static

Examples:: decode_audio.c, decode_video.c, demuxing_decoding.c, encode_audio.c, encode_video.c, muxing.c, and remuxing.c.

Definition at line 54 of file demuxing_decoding.c.

Referenced by main(), write_audio_frame(), and write_video_frame().

◆ video_frame_count

int video_frame_count = 0

static

Examples:: demuxing_decoding.c.

Definition at line 55 of file demuxing_decoding.c.

Referenced by decode_packet().

◆ audio_frame_count

int audio_frame_count = 0

static

Examples:: demuxing_decoding.c.

Definition at line 56 of file demuxing_decoding.c.

Referenced by decode_packet().

◆ refcount

int refcount = 0

static

Examples:: demuxing_decoding.c.

Definition at line 62 of file demuxing_decoding.c.

Referenced by decode_packet(), main(), and open_codec_context().