1. ffplay源码-main函数，do_exit函数
1.1. 源代码一览
#import <UIKit/UIKit.h>
#include "libavutil/avstring.h"
#include "libavutil/eval.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/dict.h"
#include "libavutil/parseutils.h"
#include "libavutil/samplefmt.h"
#include "libavutil/avassert.h"
#include "libavutil/time.h"
#include "libavformat/avformat.h"
#include "libavdevice/avdevice.h"
#include "libswscale/swscale.h"
#include "libavutil/opt.h"
#include "libavcodec/avfft.h"
#include "libswresample/swresample.h"
#include <SDL.h>
#include <SDL_thread.h>
const char program_name[] = "ffplay";
/* options specified by the user */
static AVInputFormat *file_iformat;
static const char *input_filename;
static int default_width = 640;
static int default_height = 480;
/* current context */
static AVPacket flush_pkt;
static SDL_Window *window;
static SDL_Renderer *renderer;
static SDL_RendererInfo renderer_info = {0};
typedef struct VideoState {
} VideoState;
static void stream_close(VideoState *is)
{
// TODO: stream_close
}
static void do_exit(VideoState *is)
{
if (is) {
stream_close(is);
}
if (renderer)
SDL_DestroyRenderer(renderer);
if (window)
SDL_DestroyWindow(window);
// uninit_opts();
//#if CONFIG_AVFILTER
// av_freep(&vfilters_list);
//#endif
// avformat_network_deinit();
// if (show_status)
// printf("\n");
SDL_Quit();
av_log(NULL, AV_LOG_QUIET, "%s", "");
exit(0);
}
static VideoState *stream_open(const char *filename, AVInputFormat *iformat)
{
// TODO: stream_open
return NULL;
}
/* handle an event sent by the GUI */
static void event_loop(VideoState *cur_stream)
{
// TODO: event_loop
}
int main(int argc, char *argv[]) {
int flags;
VideoState *is;
// 动态加载的初始化，这是Windows平台的dll库相关处理；
// https://blog.csdn.net/ericbar/article/details/79541420
// init_dynload();
// 设置打印的标记，AV_LOG_SKIP_REPEATED表示对于重复打印的语句，不重复输出；
// https://blog.csdn.net/ericbar/article/details/79541420
av_log_set_flags(AV_LOG_SKIP_REPEATED);
// 使命令行'-loglevel'生效
// parse_loglevel(argc, argv, options);
/* register all codecs, demux and protocols */
//#if CONFIG_AVDEVICE
// 在使用libavdevice之前，必须先运行avdevice_register_all()对设备进行注册，否则就会出错
// https://blog.csdn.net/leixiaohua1020/article/details/41211121
avdevice_register_all();
//#endif
// 打开网络流的话，前面要加上函数
// avformat_network_init();
// Initialize the cmdutils option system, in particular allocate the *_opts contexts.
// 初始化 cmdutils 选项系统，特别是分配 *_opts 上下文。
// init_opts();
// signal(SIGINT , sigterm_handler); /* Interrupt (ANSI). */
// signal(SIGTERM, sigterm_handler); /* Termination (ANSI). */
// 将程序横幅打印到 stderr。 横幅内容取决于当前版本的存储库和程序使用的 libav* 库。
// Print the program banner to stderr. The banner contents depend
// on the current version of the repository and of the libav* libraries used by
// the program.
// show_banner(argc, argv, options);
// parse_options(NULL, argc, argv, options, opt_input_file);
// input_filename：命令行 -i 指定，视频路径
NSString *inPath = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"mov"];
input_filename = [inPath UTF8String];
if (!input_filename) {
// show_usage();
// av_log(NULL, AV_LOG_FATAL, "An input file must be specified\n");
// av_log(NULL, AV_LOG_FATAL,
// "Use -h to get full help or, even better, run 'man %s'\n", program_name);
exit(1);
}
// display_disable：命令行 -nodisp 指定，不渲染画面不播放声音
// if (display_disable) {
// video_disable = 1;
// }
flags = SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER;
// audio_disable：命令行 -an 指定，渲染画面不播放声音
// if (audio_disable)
// flags &= ~SDL_INIT_AUDIO;
// else {
// /* Try to work around an occasional ALSA buffer underflow issue when the
// * period size is NPOT due to ALSA resampling by forcing the buffer size. */
// if (!SDL_getenv("SDL_AUDIO_ALSA_SET_BUFFER_SIZE"))
// SDL_setenv("SDL_AUDIO_ALSA_SET_BUFFER_SIZE","1", 1);
// }
// if (display_disable)
// flags &= ~SDL_INIT_VIDEO;
// 指定flags，SDL初始化
if (SDL_Init (flags)) {
av_log(NULL, AV_LOG_FATAL, "Could not initialize SDL - %s\n", SDL_GetError());
av_log(NULL, AV_LOG_FATAL, "(Did you set the DISPLAY variable?)\n");
exit(1);
}
// 禁用一些事件
SDL_EventState(SDL_SYSWMEVENT, SDL_IGNORE);
SDL_EventState(SDL_USEREVENT, SDL_IGNORE);
av_init_packet(&flush_pkt);
flush_pkt.data = (uint8_t *)&flush_pkt;
if (1/**!display_disable*/) {
int flags = SDL_WINDOW_HIDDEN;
// if (alwaysontop)
#if SDL_VERSION_ATLEAST(2,0,5)
flags |= SDL_WINDOW_ALWAYS_ON_TOP;
#else
av_log(NULL, AV_LOG_WARNING, "Your SDL version doesn't support SDL_WINDOW_ALWAYS_ON_TOP. Feature will be inactive.\n");
#endif
// borderless：命令行 -noborder 指定，没有边框
// if (borderless)
// flags |= SDL_WINDOW_BORDERLESS;
// else
// 可以自由拉伸
flags |= SDL_WINDOW_RESIZABLE;
window = SDL_CreateWindow(program_name, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, default_width, default_height, flags);
// "0" or "nearest" - Nearest pixel sampling
// "1" or "linear" - Linear filtering (supported by OpenGL and Direct3D)
// "2" or "best" - Currently this is the same as "linear"
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
if (window) {
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
if (!renderer) {
av_log(NULL, AV_LOG_WARNING, "Failed to initialize a hardware accelerated renderer: %s\n", SDL_GetError());
renderer = SDL_CreateRenderer(window, -1, 0);
}
if (renderer) {
if (!SDL_GetRendererInfo(renderer, &renderer_info))
av_log(NULL, AV_LOG_VERBOSE, "Initialized %s renderer.\n", renderer_info.name);
}
}
if (!window || !renderer || !renderer_info.num_texture_formats) {
av_log(NULL, AV_LOG_FATAL, "Failed to create window or renderer: %s", SDL_GetError());
do_exit(NULL);
}
}
is = stream_open(input_filename, file_iformat);
if (!is) {
av_log(NULL, AV_LOG_FATAL, "Failed to initialize VideoState!\n");
do_exit(NULL);
}
event_loop(is);
/* never returns */
return 0;
}