ffplay.c

static VideoState *stream_open(const char *filename, AVInputFormat *iformat)
{
    VideoState *is;

    is = av_mallocz(sizeof(VideoState));
    if (!is)
        return NULL;
    av_strlcpy(is->filename, filename, sizeof(is->filename));
    is->iformat = iformat;
    is->ytop    = 0;
    is->xleft   = 0;

    /* start video display */
    is->pictq_mutex = SDL_CreateMutex();
    is->pictq_cond  = SDL_CreateCond();

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

    packet_queue_init(&is->videoq);
    packet_queue_init(&is->audioq);
    packet_queue_init(&is->subtitleq);

    is->continue_read_thread = SDL_CreateCond();

    init_clock(&is->vidclk, &is->videoq.serial);
    init_clock(&is->audclk, &is->audioq.serial);
    init_clock(&is->extclk, &is->extclk.serial);
    is->audio_clock_serial = -1;
    is->audio_last_serial = -1;
    is->av_sync_type = av_sync_type;
    is->read_tid     = SDL_CreateThread(read_thread, is);
    if (!is->read_tid) {
        av_free(is);
        return NULL;
    }
    return is;
}

static void stream_cycle_channel(VideoState *is, int codec_type)
{
    AVFormatContext *ic = is->ic;
    int start_index, stream_index;
    int old_index;
    AVStream *st;
    AVProgram *p = NULL;
    int nb_streams = is->ic->nb_streams;

    if (codec_type == AVMEDIA_TYPE_VIDEO) {
        start_index = is->last_video_stream;
        old_index = is->video_stream;
    } else if (codec_type == AVMEDIA_TYPE_AUDIO) {
        start_index = is->last_audio_stream;
        old_index = is->audio_stream;
    } else {
        start_index = is->last_subtitle_stream;
        old_index = is->subtitle_stream;
    }
    stream_index = start_index;

    if (codec_type != AVMEDIA_TYPE_VIDEO && is->video_stream != -1) {
        p = av_find_program_from_stream(ic, NULL, is->video_stream);
        if (p) {
            nb_streams = p->nb_stream_indexes;
            for (start_index = 0; start_index < nb_streams; start_index++)
                if (p->stream_index[start_index] == stream_index)
                    break;
            if (start_index == nb_streams)
                start_index = -1;
            stream_index = start_index;
        }
    }

    for (;;) {
        if (++stream_index >= nb_streams)
        {
            if (codec_type == AVMEDIA_TYPE_SUBTITLE)
            {
                stream_index = -1;
                is->last_subtitle_stream = -1;
                goto the_end;
            }
            if (start_index == -1)
                return;
            stream_index = 0;
        }
        if (stream_index == start_index)
            return;
        st = is->ic->streams[p ? p->stream_index[stream_index] : stream_index];
        if (st->codec->codec_type == codec_type) {
            /* check that parameters are OK */
            switch (codec_type) {
            case AVMEDIA_TYPE_AUDIO:
                if (st->codec->sample_rate != 0 &&
                    st->codec->channels != 0)
                    goto the_end;
                break;
            case AVMEDIA_TYPE_VIDEO:
            case AVMEDIA_TYPE_SUBTITLE:
                goto the_end;
            default:
                break;
            }
        }
    }
 the_end:
    if (p && stream_index != -1)
        stream_index = p->stream_index[stream_index];
    stream_component_close(is, old_index);
    stream_component_open(is, stream_index);
}


static void toggle_full_screen(VideoState *is)
{
#if defined(__APPLE__) && SDL_VERSION_ATLEAST(1, 2, 14)
    /* OS X needs to reallocate the SDL overlays */
    int i;
    for (i = 0; i < VIDEO_PICTURE_QUEUE_SIZE; i++)
        is->pictq[i].reallocate = 1;
#endif
    is_full_screen = !is_full_screen;
    video_open(is, 1, NULL);
}

static void toggle_audio_display(VideoState *is)
{
    int bgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
    int next = is->show_mode;
    do {
        next = (next + 1) % SHOW_MODE_NB;
    } while (next != is->show_mode && (next == SHOW_MODE_VIDEO && !is->video_st || next != SHOW_MODE_VIDEO && !is->audio_st));
    if (is->show_mode != next) {
        fill_rectangle(screen,
                    is->xleft, is->ytop, is->width, is->height,
                    bgcolor, 1);
        is->force_refresh = 1;
        is->show_mode = next;
    }
}

static void refresh_loop_wait_event(VideoState *is, SDL_Event *event) {
    double remaining_time = 0.0;
    SDL_PumpEvents();
    while (!SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) {
        if (!cursor_hidden && av_gettime() - cursor_last_shown > CURSOR_HIDE_DELAY) {
            SDL_ShowCursor(0);
            cursor_hidden = 1;
        }
        if (remaining_time > 0.0)
            av_usleep((int64_t)(remaining_time * 1000000.0));
        remaining_time = REFRESH_RATE;
        if (is->show_mode != SHOW_MODE_NONE && (!is->paused || is->force_refresh))
            video_refresh(is, &remaining_time);
        SDL_PumpEvents();
    }
}

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

    for (;;) {
        double x;
        refresh_loop_wait_event(cur_stream, &event);
        switch (event.type) {
        case SDL_KEYDOWN:
            if (exit_on_keydown) {
                do_exit(cur_stream);
                break;
            }
            switch (event.key.keysym.sym) {
            case SDLK_ESCAPE:
            case SDLK_q:
                do_exit(cur_stream);
                break;
            case SDLK_f:
                toggle_full_screen(cur_stream);
                cur_stream->force_refresh = 1;
                break;
            case SDLK_p:
            case SDLK_SPACE:
                toggle_pause(cur_stream);
                break;
            case SDLK_s: // S: Step to next frame
                step_to_next_frame(cur_stream);
                break;
            case SDLK_a:
                stream_cycle_channel(cur_stream, AVMEDIA_TYPE_AUDIO);
                break;
            case SDLK_v:
                stream_cycle_channel(cur_stream, AVMEDIA_TYPE_VIDEO);
                break;
            case SDLK_c:
                stream_cycle_channel(cur_stream, AVMEDIA_TYPE_VIDEO);
                stream_cycle_channel(cur_stream, AVMEDIA_TYPE_AUDIO);
                stream_cycle_channel(cur_stream, AVMEDIA_TYPE_SUBTITLE);
                break;
            case SDLK_t:
                stream_cycle_channel(cur_stream, AVMEDIA_TYPE_SUBTITLE);
                break;
            case SDLK_w:
                toggle_audio_display(cur_stream);
                break;
            case SDLK_PAGEUP:
                incr = 600.0;
                goto do_seek;
            case SDLK_PAGEDOWN:
                incr = -600.0;
                goto do_seek;
            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 (seek_by_bytes) {
                        if (cur_stream->video_stream >= 0 && cur_stream->video_current_pos >= 0) {
                            pos = cur_stream->video_current_pos;
                        } else if (cur_stream->audio_stream >= 0 && cur_stream->audio_pkt.pos >= 0) {
                            pos = cur_stream->audio_pkt.pos;
                        } else
                            pos = avio_tell(cur_stream->ic->pb);
                        if (cur_stream->ic->bit_rate)
                            incr *= cur_stream->ic->bit_rate / 8.0;
                        else
                            incr *= 180000.0;
                        pos += incr;
                        stream_seek(cur_stream, pos, incr, 1);
                    } else {
                        pos = get_master_clock(cur_stream);
                        if (isnan(pos))
                            pos = (double)cur_stream->seek_pos / AV_TIME_BASE;
                        pos += incr;
                        if (cur_stream->ic->start_time != AV_NOPTS_VALUE && pos < cur_stream->ic->start_time / (double)AV_TIME_BASE)
                            pos = cur_stream->ic->start_time / (double)AV_TIME_BASE;
                        stream_seek(cur_stream, (int64_t)(pos * AV_TIME_BASE), (int64_t)(incr * AV_TIME_BASE), 0);
                    }
                break;
            default:
                break;
            }
            break;
        case SDL_VIDEOEXPOSE:
            cur_stream->force_refresh = 1;
            break;
        case SDL_MOUSEBUTTONDOWN:
            if (exit_on_mousedown) {
                do_exit(cur_stream);
                break;
            }
        case SDL_MOUSEMOTION:
            if (cursor_hidden) {
                SDL_ShowCursor(1);
                cursor_hidden = 0;
            }
            cursor_last_shown = av_gettime();
            if (event.type == SDL_MOUSEBUTTONDOWN) {
                x = event.button.x;
            } else {
                if (event.motion.state != SDL_PRESSED)
                    break;
                x = event.motion.x;
            }
                if (seek_by_bytes || cur_stream->ic->duration <= 0) {
                    uint64_t size =  avio_size(cur_stream->ic->pb);
                    stream_seek(cur_stream, size*x/cur_stream->width, 0, 1);
                } else {
                    int64_t ts;
                    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 = x / cur_stream->width;
                    ns   = frac * tns;
                    hh   = ns / 3600;
                    mm   = (ns % 3600) / 60;
                    ss   = (ns % 60);
                    av_log(NULL, AV_LOG_INFO,
                           "Seek to %2.0f%% (%2d:%02d:%02d) of total duration (%2d:%02d:%02d)       \n", frac*100,
                            hh, mm, ss, thh, tmm, tss);
                    ts = frac * cur_stream->ic->duration;
                    if (cur_stream->ic->start_time != AV_NOPTS_VALUE)
                        ts += cur_stream->ic->start_time;
                    stream_seek(cur_stream, ts, 0, 0);
                }
            break;
        case SDL_VIDEORESIZE:
                screen = SDL_SetVideoMode(FFMIN(16383, event.resize.w), event.resize.h, 0,
                                          SDL_HWSURFACE|SDL_RESIZABLE|SDL_ASYNCBLIT|SDL_HWACCEL);
                if (!screen) {
                    av_log(NULL, AV_LOG_FATAL, "Failed to set video mode\n");
                    do_exit(cur_stream);
                }
                screen_width  = cur_stream->width  = screen->w;
                screen_height = cur_stream->height = screen->h;
                cur_stream->force_refresh = 1;
            break;
        case SDL_QUIT:
        case FF_QUIT_EVENT:
            do_exit(cur_stream);
            break;
        case FF_ALLOC_EVENT:
            alloc_picture(event.user.data1);
            break;
        default:
            break;
        }
    }
}

static int opt_frame_size(void *optctx, const char *opt, const char *arg)
{
    av_log(NULL, AV_LOG_WARNING, "Option -s is deprecated, use -video_size.\n");
    return opt_default(NULL, "video_size", arg);
}

static int opt_width(void *optctx, const char *opt, const char *arg)
{
    screen_width = parse_number_or_die(opt, arg, OPT_INT64, 1, INT_MAX);
    return 0;
}

static int opt_height(void *optctx, const char *opt, const char *arg)
{
    screen_height = parse_number_or_die(opt, arg, OPT_INT64, 1, INT_MAX);
    return 0;
}

static int opt_format(void *optctx, const char *opt, const char *arg)
{
    file_iformat = av_find_input_format(arg);
    if (!file_iformat) {
        av_log(NULL, AV_LOG_FATAL, "Unknown input format: %s\n", arg);
        return AVERROR(EINVAL);
    }
    return 0;
}

static int opt_frame_pix_fmt(void *optctx, const char *opt, const char *arg)
{
    av_log(NULL, AV_LOG_WARNING, "Option -pix_fmt is deprecated, use -pixel_format.\n");
    return opt_default(NULL, "pixel_format", arg);
}

static int opt_sync(void *optctx, const char *opt, 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 {
        av_log(NULL, AV_LOG_ERROR, "Unknown value for %s: %s\n", opt, arg);
        exit(1);
    }
    return 0;
}

static int opt_seek(void *optctx, const char *opt, const char *arg)
{
    start_time = parse_time_or_die(opt, arg, 1);
    return 0;
}

static int opt_duration(void *optctx, const char *opt, const char *arg)
{
    duration = parse_time_or_die(opt, arg, 1);
    return 0;
}

static int opt_show_mode(void *optctx, const char *opt, const char *arg)
{
    show_mode = !strcmp(arg, "video") ? SHOW_MODE_VIDEO :
                !strcmp(arg, "waves") ? SHOW_MODE_WAVES :
                !strcmp(arg, "rdft" ) ? SHOW_MODE_RDFT  :
                parse_number_or_die(opt, arg, OPT_INT, 0, SHOW_MODE_NB-1);
    return 0;
}

static void opt_input_file(void *optctx, const char *filename)
{
    if (input_filename) {
        av_log(NULL, AV_LOG_FATAL,
               "Argument '%s' provided as input filename, but '%s' was already specified.\n",
                filename, input_filename);
        exit(1);
    }
    if (!strcmp(filename, "-"))
        filename = "pipe:";
    input_filename = filename;
}

static int opt_codec(void *optctx, const char *opt, const char *arg)
{
   const char *spec = strchr(opt, ':');
   if (!spec) {
       av_log(NULL, AV_LOG_ERROR,
              "No media specifier was specified in '%s' in option '%s'\n",
               arg, opt);
       return AVERROR(EINVAL);
   }
   spec++;
   switch (spec[0]) {
   case 'a' :    audio_codec_name = arg; break;
   case 's' : subtitle_codec_name = arg; break;
   case 'v' :    video_codec_name = arg; break;
   default:
       av_log(NULL, AV_LOG_ERROR,
              "Invalid media specifier '%s' in option '%s'\n", spec, opt);
       return AVERROR(EINVAL);
   }
   return 0;
}

static int dummy;

static const OptionDef options[] = {
#include "cmdutils_common_opts.h"
    { "x", HAS_ARG, { .func_arg = opt_width }, "force displayed width", "width" },
    { "y", HAS_ARG, { .func_arg = opt_height }, "force displayed height", "height" },
    { "s", HAS_ARG | OPT_VIDEO, { .func_arg = opt_frame_size }, "set frame size (WxH or abbreviation)", "size" },
    { "fs", OPT_BOOL, { &is_full_screen }, "force full screen" },
    { "an", OPT_BOOL, { &audio_disable }, "disable audio" },
    { "vn", OPT_BOOL, { &video_disable }, "disable video" },
    { "sn", OPT_BOOL, { &subtitle_disable }, "disable subtitling" },
    { "ast", OPT_INT | HAS_ARG | OPT_EXPERT, { &wanted_stream[AVMEDIA_TYPE_AUDIO] }, "select desired audio stream", "stream_number" },
    { "vst", OPT_INT | HAS_ARG | OPT_EXPERT, { &wanted_stream[AVMEDIA_TYPE_VIDEO] }, "select desired video stream", "stream_number" },
    { "sst", OPT_INT | HAS_ARG | OPT_EXPERT, { &wanted_stream[AVMEDIA_TYPE_SUBTITLE] }, "select desired subtitle stream", "stream_number" },
    { "ss", HAS_ARG, { .func_arg = opt_seek }, "seek to a given position in seconds", "pos" },
    { "t", HAS_ARG, { .func_arg = opt_duration }, "play  \"duration\" seconds of audio/video", "duration" },
    { "bytes", OPT_INT | HAS_ARG, { &seek_by_bytes }, "seek by bytes 0=off 1=on -1=auto", "val" },
    { "nodisp", OPT_BOOL, { &display_disable }, "disable graphical display" },
    { "f", HAS_ARG, { .func_arg = opt_format }, "force format", "fmt" },
    { "pix_fmt", HAS_ARG | OPT_EXPERT | OPT_VIDEO, { .func_arg = opt_frame_pix_fmt }, "set pixel format", "format" },
    { "stats", OPT_BOOL | OPT_EXPERT, { &show_status }, "show status", "" },
    { "bug", OPT_INT | HAS_ARG | OPT_EXPERT, { &workaround_bugs }, "workaround bugs", "" },
    { "fast", OPT_BOOL | OPT_EXPERT, { &fast }, "non spec compliant optimizations", "" },
    { "genpts", OPT_BOOL | OPT_EXPERT, { &genpts }, "generate pts", "" },
    { "drp", OPT_INT | HAS_ARG | OPT_EXPERT, { &decoder_reorder_pts }, "let decoder reorder pts 0=off 1=on -1=auto", ""},
    { "lowres", OPT_INT | HAS_ARG | OPT_EXPERT, { &lowres }, "", "" },
    { "ec", OPT_INT | HAS_ARG | OPT_EXPERT, { &error_concealment }, "set error concealment options",  "bit_mask" },
    { "sync", HAS_ARG | OPT_EXPERT, { .func_arg = opt_sync }, "set audio-video sync. type (type=audio/video/ext)", "type" },
    { "autoexit", OPT_BOOL | OPT_EXPERT, { &autoexit }, "exit at the end", "" },
    { "exitonkeydown", OPT_BOOL | OPT_EXPERT, { &exit_on_keydown }, "exit on key down", "" },
    { "exitonmousedown", OPT_BOOL | OPT_EXPERT, { &exit_on_mousedown }, "exit on mouse down", "" },
    { "loop", OPT_INT | HAS_ARG | OPT_EXPERT, { &loop }, "set number of times the playback shall be looped", "loop count" },
    { "framedrop", OPT_BOOL | OPT_EXPERT, { &framedrop }, "drop frames when cpu is too slow", "" },
    { "infbuf", OPT_BOOL | OPT_EXPERT, { &infinite_buffer }, "don't limit the input buffer size (useful with realtime streams)", "" },
    { "window_title", OPT_STRING | HAS_ARG, { &window_title }, "set window title", "window title" },
#if CONFIG_AVFILTER
    { "vf", OPT_STRING | HAS_ARG, { &vfilters }, "set video filters", "filter_graph" },
    { "af", OPT_STRING | HAS_ARG, { &afilters }, "set audio filters", "filter_graph" },
#endif
    { "rdftspeed", OPT_INT | HAS_ARG| OPT_AUDIO | OPT_EXPERT, { &rdftspeed }, "rdft speed", "msecs" },
    { "showmode", HAS_ARG, { .func_arg = opt_show_mode}, "select show mode (0 = video, 1 = waves, 2 = RDFT)", "mode" },
    { "default", HAS_ARG | OPT_AUDIO | OPT_VIDEO | OPT_EXPERT, { .func_arg = opt_default }, "generic catch all option", "" },
    { "i", OPT_BOOL, { &dummy}, "read specified file", "input_file"},
    { "codec", HAS_ARG, { .func_arg = opt_codec}, "force decoder", "decoder_name" },
    { "acodec", HAS_ARG | OPT_STRING | OPT_EXPERT, {    &audio_codec_name }, "force audio decoder",    "decoder_name" },
    { "scodec", HAS_ARG | OPT_STRING | OPT_EXPERT, { &subtitle_codec_name }, "force subtitle decoder", "decoder_name" },
    { "vcodec", HAS_ARG | OPT_STRING | OPT_EXPERT, {    &video_codec_name }, "force video decoder",    "decoder_name" },
    { NULL, },
};

static void show_usage(void)
{
    av_log(NULL, AV_LOG_INFO, "Simple media player\n");
    av_log(NULL, AV_LOG_INFO, "usage: %s [options] input_file\n", program_name);
    av_log(NULL, AV_LOG_INFO, "\n");
}

void show_help_default(const char *opt, const char *arg)
{
    av_log_set_callback(log_callback_help);
    show_usage();
    show_help_options(options, "Main options:", 0, OPT_EXPERT, 0);
    show_help_options(options, "Advanced options:", OPT_EXPERT, 0, 0);
    printf("\n");
    show_help_children(avcodec_get_class(), AV_OPT_FLAG_DECODING_PARAM);
    show_help_children(avformat_get_class(), AV_OPT_FLAG_DECODING_PARAM);
#if !CONFIG_AVFILTER
    show_help_children(sws_get_class(), AV_OPT_FLAG_ENCODING_PARAM);
#else
    show_help_children(avfilter_get_class(), AV_OPT_FLAG_FILTERING_PARAM);
#endif
    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"
           "c                   cycle program\n"
           "w                   show audio waves\n"
           "s                   activate frame-step mode\n"
           "left/right          seek backward/forward 10 seconds\n"
           "down/up             seek backward/forward 1 minute\n"
           "page down/page up   seek backward/forward 10 minutes\n"
           "mouse click         seek to percentage in file corresponding to fraction of width\n"
           );
}

static int lockmgr(void **mtx, enum AVLockOp op)
{
   switch(op) {
      case AV_LOCK_CREATE:
          *mtx = SDL_CreateMutex();
          if(!*mtx)
              return 1;
          return 0;
      case AV_LOCK_OBTAIN:
          return !!SDL_LockMutex(*mtx);
      case AV_LOCK_RELEASE:
          return !!SDL_UnlockMutex(*mtx);
      case AV_LOCK_DESTROY:
          SDL_DestroyMutex(*mtx);
          return 0;
   }
   return 1;
}

/* Called from the main */
int main(int argc, char **argv)
{
    int flags;
    VideoState *is;
    char dummy_videodriver[] = "SDL_VIDEODRIVER=dummy";

    av_log_set_flags(AV_LOG_SKIP_REPEATED);
    parse_loglevel(argc, argv, options);

    /* register all codecs, demux and protocols */
    avcodec_register_all();
#if CONFIG_AVDEVICE
    avdevice_register_all();
#endif
#if CONFIG_AVFILTER
    avfilter_register_all();
#endif
    av_register_all();
    avformat_network_init();

    init_opts();

    signal(SIGINT , sigterm_handler); /* Interrupt (ANSI).    */
    signal(SIGTERM, sigterm_handler); /* Termination (ANSI).  */

    show_banner(argc, argv, options);

    parse_options(NULL, argc, argv, options, opt_input_file);

    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);
    }

    if (display_disable) {
        video_disable = 1;
    }
    flags = SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER;
    if (audio_disable)
        flags &= ~SDL_INIT_AUDIO;
    if (display_disable)
        SDL_putenv(dummy_videodriver); /* For the event queue, we always need a video driver. */
#if !defined(__MINGW32__) && !defined(__APPLE__)
    flags |= SDL_INIT_EVENTTHREAD; /* Not supported on Windows or Mac OS X */
#endif
    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);
    }

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

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

    if (av_lockmgr_register(lockmgr)) {
        av_log(NULL, AV_LOG_FATAL, "Could not initialize lock manager!\n");
        do_exit(NULL);
    }

    av_init_packet(&flush_pkt);
    flush_pkt.data = (uint8_t *)&flush_pkt;

    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;
}