mirror of
https://github.com/DevonCrawford/Video-Editing-Automation.git
synced 2026-01-15 08:58:00 -05:00
79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/**
|
|
* @file VideoContext.h
|
|
* @author Devon Crawford
|
|
* @date February 21, 2019
|
|
* @brief File containing the definition and usage for VideoContext API:
|
|
* The primary data structure for raw media files, videos just as they
|
|
* are on disk.
|
|
* Higher level structures such as Clip build ontop of this.
|
|
*/
|
|
|
|
#ifndef _VIDEOCONTEXT_API_
|
|
#define _VIDEOCONTEXT_API_
|
|
|
|
#include <stdio.h>
|
|
#include <libavformat/avformat.h>
|
|
#include <libavutil/pixdesc.h>
|
|
|
|
enum PacketStreamType { DEC_STREAM_NONE = -1, DEC_STREAM_VIDEO, DEC_STREAM_AUDIO };
|
|
|
|
typedef struct VideoContext {
|
|
/*
|
|
Open file information
|
|
*/
|
|
AVFormatContext *fmt_ctx; // fmt_ctx->streams[stream_index] contains all streams
|
|
/*
|
|
Codecs used for decoding.
|
|
Encoding is handled by OutputContext, since the entire sequence
|
|
needs to be encoded with the same codec and codec parameters
|
|
*/
|
|
AVCodec *video_codec, *audio_codec;
|
|
/*
|
|
CodecContexts used for demuxing
|
|
*/
|
|
AVCodecContext *video_codec_ctx, *audio_codec_ctx;
|
|
/*
|
|
index of stream in fmt_ctx->streams[stream_index]
|
|
*/
|
|
int video_stream_idx, audio_stream_idx;
|
|
/*
|
|
internal use only. used in clip_read_frame()
|
|
*/
|
|
enum PacketStreamType last_decoder_packet_stream;
|
|
} VideoContext;
|
|
|
|
# define VIDEO_CONTEXT_STREAM_TYPES_LEN 2
|
|
|
|
AVStream *get_video_stream(VideoContext *vid_ctx);
|
|
AVStream *get_audio_stream(VideoContext *vid_ctx);
|
|
AVRational get_video_time_base(VideoContext *vid_ctx);
|
|
AVRational get_audio_time_base(VideoContext *vid_ctx);
|
|
/*
|
|
out @param vid_ctx - allocated context containing format, streams and codecs
|
|
in @param filename - name of video file
|
|
*/
|
|
int open_video(VideoContext *vid_ctx, char *filename);
|
|
|
|
/* Return >=0 if OK, < 0 on fail */
|
|
int open_format_context(VideoContext *vid_ctx, char *filename);
|
|
|
|
/**
|
|
Finds a stream and its associated codec
|
|
Call this function after open_format_context() - for each AVMediaType
|
|
Returns >= 0 if OK, < 0 on fail
|
|
*/
|
|
int open_codec_context(VideoContext *vid_ctx, enum AVMediaType type);
|
|
|
|
|
|
void init_video_context(VideoContext *vid_ctx);
|
|
|
|
void free_video_context(VideoContext *vid_ctx);
|
|
|
|
/**
|
|
* Print most data within an AVCodecContext
|
|
* @param c AVCodecContext with data
|
|
* @return char * allocated on heap, it is the callers responsibility to free
|
|
*/
|
|
char *print_codec_context(AVCodecContext *c);
|
|
|
|
#endif |