ffplay.c

    is->subpq_mutex = SDL_CreateMutex();
    is->subpq_cond = SDL_CreateCond();

    is->subtitle_decoder_mutex = SDL_CreateMutex();
    is->audio_decoder_mutex = SDL_CreateMutex();
    is->video_decoder_mutex = SDL_CreateMutex();

    /* add the refresh timer to draw the picture */
    schedule_refresh(is, 40);

    is->av_sync_type = av_sync_type;
    is->parse_tid = SDL_CreateThread(decode_thread, is);
    if (!is->parse_tid) {
        av_free(is);
        return NULL;
    }
    return is;
}

static void stream_close(VideoState *is)
{
    VideoPicture *vp;
    int i;
    /* XXX: use a special url_shutdown call to abort parse cleanly */
    is->abort_request = 1;
    SDL_WaitThread(is->parse_tid, NULL);

    /* free all pictures */
    for(i=0;i<VIDEO_PICTURE_QUEUE_SIZE; i++) {
        vp = &is->pictq[i];
        if (vp->bmp) {
            SDL_FreeYUVOverlay(vp->bmp);
            vp->bmp = NULL;
        }
    }
    SDL_DestroyMutex(is->pictq_mutex);
    SDL_DestroyCond(is->pictq_cond);
    SDL_DestroyMutex(is->subpq_mutex);
    SDL_DestroyCond(is->subpq_cond);
    SDL_DestroyMutex(is->subtitle_decoder_mutex);
    SDL_DestroyMutex(is->audio_decoder_mutex);
    SDL_DestroyMutex(is->video_decoder_mutex);
}

void stream_cycle_channel(VideoState *is, int codec_type)
{
    AVFormatContext *ic = is->ic;
    int start_index, stream_index;
    AVStream *st;

    if (codec_type == CODEC_TYPE_VIDEO)
        start_index = is->video_stream;
    else if (codec_type == CODEC_TYPE_AUDIO)
        start_index = is->audio_stream;
    else
        start_index = is->subtitle_stream;
    if (start_index < (codec_type == CODEC_TYPE_SUBTITLE ? -1 : 0))
        return;
    stream_index = start_index;
    for(;;) {
        if (++stream_index >= is->ic->nb_streams)
        {
            if (codec_type == CODEC_TYPE_SUBTITLE)
            {
                stream_index = -1;
                goto the_end;
            } else
                stream_index = 0;
        }
        if (stream_index == start_index)
            return;
        st = ic->streams[stream_index];
        if (st->codec->codec_type == codec_type) {
            /* check that parameters are OK */
            switch(codec_type) {
            case CODEC_TYPE_AUDIO:
                if (st->codec->sample_rate != 0 &&
                    st->codec->channels != 0)
                    goto the_end;
                break;
            case CODEC_TYPE_VIDEO:
            case CODEC_TYPE_SUBTITLE:
                goto the_end;
            default:
                break;
            }
        }
    }
 the_end:
    stream_component_close(is, start_index);
    stream_component_open(is, stream_index);
}


void toggle_full_screen(void)
{
    int w, h, flags;
    is_full_screen = !is_full_screen;
    flags = SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_HWACCEL;
    if (is_full_screen) {
        w = fs_screen_width;
        h = fs_screen_height;
        flags |= SDL_FULLSCREEN;
    } else {
        w = screen_width;
        h = screen_height;
        flags |= SDL_RESIZABLE;
    }
    screen = SDL_SetVideoMode(w, h, 0, flags);
    cur_stream->width = w;
    cur_stream->height = h;
}

void toggle_pause(void)
{
    if (cur_stream)
        stream_pause(cur_stream);
    step = 0;
}

void step_to_next_frame(void)
{
    if (cur_stream) {
        if (cur_stream->paused)
            cur_stream->paused=0;
        cur_stream->video_current_pts = get_video_clock(cur_stream);
    }
    step = 1;
}

void do_exit(void)
{
    if (cur_stream) {
        stream_close(cur_stream);
        cur_stream = NULL;
    }
    if (show_status)
        printf("\n");
    SDL_Quit();
    exit(0);
}

void toggle_audio_display(void)
{
    if (cur_stream) {
        cur_stream->show_audio = !cur_stream->show_audio;
    }
}

/* handle an event sent by the GUI */
void event_loop(void)
{
    SDL_Event event;
    double incr, pos, frac;

    for(;;) {
        SDL_WaitEvent(&event);
        switch(event.type) {
        case SDL_KEYDOWN:
            switch(event.key.keysym.sym) {
            case SDLK_ESCAPE:
            case SDLK_q:
                do_exit();
                break;
            case SDLK_f:
                toggle_full_screen();
                break;
            case SDLK_p:
            case SDLK_SPACE:
                toggle_pause();
                break;
            case SDLK_s: //S: Step to next frame
                step_to_next_frame();
                break;
            case SDLK_a:
                if (cur_stream)
                    stream_cycle_channel(cur_stream, CODEC_TYPE_AUDIO);
                break;
            case SDLK_v:
                if (cur_stream)
                    stream_cycle_channel(cur_stream, CODEC_TYPE_VIDEO);
                break;
            case SDLK_t:
                if (cur_stream)
                    stream_cycle_channel(cur_stream, CODEC_TYPE_SUBTITLE);
                break;
            case SDLK_w:
                toggle_audio_display();
                break;
            case SDLK_LEFT:
                incr = -10.0;
                goto do_seek;
            case SDLK_RIGHT:
                incr = 10.0;
                goto do_seek;
            case SDLK_UP:
                incr = 60.0;
                goto do_seek;
            case SDLK_DOWN:
                incr = -60.0;
            do_seek:
                if (cur_stream) {
                    pos = get_master_clock(cur_stream);
                    pos += incr;
                    stream_seek(cur_stream, (int64_t)(pos * AV_TIME_BASE), incr);
                }
                break;
            default:
                break;
            }
            break;
        case SDL_MOUSEBUTTONDOWN:
            if (cur_stream) {
                int ns, hh, mm, ss;
                int tns, thh, tmm, tss;
                tns = cur_stream->ic->duration/1000000LL;
                thh = tns/3600;
                tmm = (tns%3600)/60;
                tss = (tns%60);
                frac = (double)event.button.x/(double)cur_stream->width;
                ns = frac*tns;
                hh = ns/3600;
                mm = (ns%3600)/60;
                ss = (ns%60);
                fprintf(stderr, "Seek to %2.0f%% (%2d:%02d:%02d) of total duration (%2d:%02d:%02d)       \n", frac*100,
                        hh, mm, ss, thh, tmm, tss);
                stream_seek(cur_stream, (int64_t)(cur_stream->ic->start_time+frac*cur_stream->ic->duration), 0);
            }
            break;
        case SDL_VIDEORESIZE:
            if (cur_stream) {
                screen = SDL_SetVideoMode(event.resize.w, event.resize.h, 0,
                                          SDL_HWSURFACE|SDL_RESIZABLE|SDL_ASYNCBLIT|SDL_HWACCEL);
                cur_stream->width = event.resize.w;
                cur_stream->height = event.resize.h;
            }
            break;
        case SDL_QUIT:
        case FF_QUIT_EVENT:
            do_exit();
            break;
        case FF_ALLOC_EVENT:
            alloc_picture(event.user.data1);
            break;
        case FF_REFRESH_EVENT:
            video_refresh_timer(event.user.data1);
            break;
        default:
            break;
        }
    }
}

void opt_width(const char *arg)
{
    screen_width = atoi(arg);
}

void opt_height(const char *arg)
{
    screen_height = atoi(arg);
}

static void opt_format(const char *arg)
{
    file_iformat = av_find_input_format(arg);
    if (!file_iformat) {
        fprintf(stderr, "Unknown input format: %s\n", arg);
        exit(1);
    }
}

static void opt_image_format(const char *arg)
{
    AVImageFormat *f;

    for(f = first_image_format; f != NULL; f = f->next) {
        if (!strcmp(arg, f->name))
            break;
    }
    if (!f) {
        fprintf(stderr, "Unknown image format: '%s'\n", arg);
        exit(1);
    }
    image_format = f;
}

#ifdef CONFIG_NETWORK
void opt_rtp_tcp(void)
{
    /* only tcp protocol */
    rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_TCP);
}
#endif

void opt_sync(const char *arg)
{
    if (!strcmp(arg, "audio"))
        av_sync_type = AV_SYNC_AUDIO_MASTER;
    else if (!strcmp(arg, "video"))
        av_sync_type = AV_SYNC_VIDEO_MASTER;
    else if (!strcmp(arg, "ext"))
        av_sync_type = AV_SYNC_EXTERNAL_CLOCK;
    else
        show_help();
}

void opt_seek(const char *arg)
{
    start_time = parse_date(arg, 1);
}

static void opt_debug(const char *arg)
{
    debug = atoi(arg);
}

static void opt_vismv(const char *arg)
{
    debug_mv = atoi(arg);
}

static void opt_thread_count(const char *arg)
{
    thread_count= atoi(arg);
#if !defined(HAVE_THREADS)
    fprintf(stderr, "Warning: not compiled with thread support, using thread emulation\n");
#endif
}

const OptionDef options[] = {
    { "h", 0, {(void*)show_help}, "show help" },
    { "x", HAS_ARG, {(void*)opt_width}, "force displayed width", "width" },
    { "y", HAS_ARG, {(void*)opt_height}, "force displayed height", "height" },
    { "fs", OPT_BOOL, {(void*)&is_full_screen}, "force full screen" },
    { "an", OPT_BOOL, {(void*)&audio_disable}, "disable audio" },
    { "vn", OPT_BOOL, {(void*)&video_disable}, "disable video" },
    { "ss", HAS_ARG, {(void*)&opt_seek}, "seek to a given position in seconds", "pos" },
    { "nodisp", OPT_BOOL, {(void*)&display_disable}, "disable graphical display" },
    { "f", HAS_ARG, {(void*)opt_format}, "force format", "fmt" },
    { "img", HAS_ARG, {(void*)opt_image_format}, "force image format", "img_fmt" },
    { "stats", OPT_BOOL | OPT_EXPERT, {(void*)&show_status}, "show status", "" },
    { "debug", HAS_ARG | OPT_EXPERT, {(void*)opt_debug}, "print specific debug info", "" },
    { "bug", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&workaround_bugs}, "workaround bugs", "" },
    { "vismv", HAS_ARG | OPT_EXPERT, {(void*)opt_vismv}, "visualize motion vectors", "" },
    { "fast", OPT_BOOL | OPT_EXPERT, {(void*)&fast}, "non spec compliant optimizations", "" },
    { "genpts", OPT_BOOL | OPT_EXPERT, {(void*)&genpts}, "generate pts", "" },
    { "lowres", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&lowres}, "", "" },
    { "skiploop", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&skip_loop_filter}, "", "" },
    { "skipframe", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&skip_frame}, "", "" },
    { "skipidct", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&skip_idct}, "", "" },
    { "idct", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&idct}, "set idct algo",  "algo" },
    { "er", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&error_resilience}, "set error detection threshold (0-4)",  "threshold" },
    { "ec", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&error_concealment}, "set error concealment options",  "bit_mask" },
#ifdef CONFIG_NETWORK
    { "rtp_tcp", OPT_EXPERT, {(void*)&opt_rtp_tcp}, "force RTP/TCP protocol usage", "" },
#endif
    { "sync", HAS_ARG | OPT_EXPERT, {(void*)opt_sync}, "set audio-video sync. type (type=audio/video/ext)", "type" },
    { "threads", HAS_ARG | OPT_EXPERT, {(void*)opt_thread_count}, "thread count", "count" },
    { NULL, },
};

void show_help(void)
{
    printf("ffplay version " FFMPEG_VERSION ", Copyright (c) 2003 Fabrice Bellard\n"
           "usage: ffplay [options] input_file\n"
           "Simple media player\n");
    printf("\n");
    show_help_options(options, "Main options:\n",
                      OPT_EXPERT, 0);
    show_help_options(options, "\nAdvanced options:\n",
                      OPT_EXPERT, OPT_EXPERT);
    printf("\nWhile playing:\n"
           "q, ESC              quit\n"
           "f                   toggle full screen\n"
           "p, SPC              pause\n"
           "a                   cycle audio channel\n"
           "v                   cycle video channel\n"
           "t                   cycle subtitle channel\n"
           "w                   show audio waves\n"
           "left/right          seek backward/forward 10 seconds\n"
           "down/up             seek backward/forward 1 minute\n"
           "mouse click         seek to percentage in file corresponding to fraction of width\n"
           );
    exit(1);
}

void parse_arg_file(const char *filename)
{
    if (!strcmp(filename, "-"))
                    filename = "pipe:";
    input_filename = filename;
}

/* Called from the main */
int main(int argc, char **argv)
{
    int flags, w, h;

    /* register all codecs, demux and protocols */
    av_register_all();

    #ifdef CONFIG_OS2
      MorphToPM(); // Morph the VIO application to a PM one to be able to use Win* functions

      // Make stdout and stderr unbuffered
      setbuf( stdout, NULL );
      setbuf( stderr, NULL );
    #endif

    parse_options(argc, argv, options);

    if (!input_filename)
        show_help();

    if (display_disable) {
        video_disable = 1;
    }
    flags = SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER;
#if !defined(CONFIG_WIN32) && !defined(CONFIG_DARWIN)
    flags |= SDL_INIT_EVENTTHREAD; /* Not supported on win32 or darwin */
#endif
    if (SDL_Init (flags)) {
        fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
        exit(1);
    }

    if (!display_disable) {
        const SDL_VideoInfo *vi = SDL_GetVideoInfo();
        fs_screen_width = vi->current_w;
        fs_screen_height = vi->current_h;

        flags = SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_HWACCEL;
        if (is_full_screen && fs_screen_width) {
            w = fs_screen_width;
            h = fs_screen_height;
            flags |= SDL_FULLSCREEN;
        } else {
            w = screen_width;
            h = screen_height;
            flags |= SDL_RESIZABLE;
        }
#ifndef CONFIG_DARWIN
        screen = SDL_SetVideoMode(w, h, 0, flags);
#else
        /* setting bits_per_pixel = 0 or 32 causes blank video on OS X */
        screen = SDL_SetVideoMode(w, h, 24, flags);
#endif
        if (!screen) {
            fprintf(stderr, "SDL: could not set video mode - exiting\n");
            exit(1);
        }
        SDL_WM_SetCaption("FFplay", "FFplay");
    }

    SDL_EventState(SDL_ACTIVEEVENT, SDL_IGNORE);
    SDL_EventState(SDL_MOUSEMOTION, SDL_IGNORE);
    SDL_EventState(SDL_SYSWMEVENT, SDL_IGNORE);
    SDL_EventState(SDL_USEREVENT, SDL_IGNORE);

    cur_stream = stream_open(input_filename, file_iformat);

    event_loop();

    /* never returns */

    return 0;
}