static int read_thread(void *arg)

{

    VideoState *is = arg;

    AVFormatContext *ic = NULL;

    int err, i, ret;

    int st_index[AVMEDIA_TYPE_NB];

    AVPacket pkt1, *pkt = &pkt1;

    int eof = 0;

    int pkt_in_play_range = 0;

    AVDictionaryEntry *t;

    AVDictionary **opts;

    int orig_nb_streams;

    SDL_mutex *wait_mutex = SDL_CreateMutex();



    memset(st_index, -1, sizeof(st_index));

    is->last_video_stream = is->video_stream = -1;

    is->last_audio_stream = is->audio_stream = -1;

    is->last_subtitle_stream = is->subtitle_stream = -1;



    ic = avformat_alloc_context();

    ic->interrupt_callback.callback = decode_interrupt_cb;

    ic->interrupt_callback.opaque = is;

    err = avformat_open_input(&ic, is->filename, is->iformat, &format_opts);

    if (err < 0) {

        print_error(is->filename, err);

        ret = -1;

        goto fail;

    }

    if ((t = av_dict_get(format_opts, "", NULL, AV_DICT_IGNORE_SUFFIX))) {

        av_log(NULL, AV_LOG_ERROR, "Option %s not found.\n", t->key);

        ret = AVERROR_OPTION_NOT_FOUND;

        goto fail;

    }

    is->ic = ic;



    if (genpts)

        ic->flags |= AVFMT_FLAG_GENPTS;



    opts = setup_find_stream_info_opts(ic, codec_opts);

    orig_nb_streams = ic->nb_streams;



    err = avformat_find_stream_info(ic, opts);

    if (err < 0) {

        fprintf(stderr, "%s: could not find codec parameters\n", is->filename);

        ret = -1;

        goto fail;

    }

    for (i = 0; i < orig_nb_streams; i++)

        av_dict_free(&opts[i]);

    av_freep(&opts);



    if (ic->pb)

        ic->pb->eof_reached = 0; // FIXME hack, ffplay maybe should not use url_feof() to test for the end



    if (seek_by_bytes < 0)

        seek_by_bytes = !!(ic->iformat->flags & AVFMT_TS_DISCONT);



    is->max_frame_duration = (ic->iformat->flags & AVFMT_TS_DISCONT) ? 10.0 : 3600.0;



    /* if seeking requested, we execute it */

    if (start_time != AV_NOPTS_VALUE) {

        int64_t timestamp;



        timestamp = start_time;

        /* add the stream start time */

        if (ic->start_time != AV_NOPTS_VALUE)

            timestamp += ic->start_time;

        ret = avformat_seek_file(ic, -1, INT64_MIN, timestamp, INT64_MAX, 0);

        if (ret < 0) {

            fprintf(stderr, "%s: could not seek to position %0.3f\n",

                    is->filename, (double)timestamp / AV_TIME_BASE);

        }

    }



    is->realtime = is_realtime(ic);



    for (i = 0; i < ic->nb_streams; i++)

        ic->streams[i]->discard = AVDISCARD_ALL;

    if (!video_disable)

        st_index[AVMEDIA_TYPE_VIDEO] =

            av_find_best_stream(ic, AVMEDIA_TYPE_VIDEO,

                                wanted_stream[AVMEDIA_TYPE_VIDEO], -1, NULL, 0);

    if (!audio_disable)

        st_index[AVMEDIA_TYPE_AUDIO] =

            av_find_best_stream(ic, AVMEDIA_TYPE_AUDIO,

                                wanted_stream[AVMEDIA_TYPE_AUDIO],

                                st_index[AVMEDIA_TYPE_VIDEO],

                                NULL, 0);

    if (!video_disable)

        st_index[AVMEDIA_TYPE_SUBTITLE] =

            av_find_best_stream(ic, AVMEDIA_TYPE_SUBTITLE,

                                wanted_stream[AVMEDIA_TYPE_SUBTITLE],

                                (st_index[AVMEDIA_TYPE_AUDIO] >= 0 ?

                                 st_index[AVMEDIA_TYPE_AUDIO] :

                                 st_index[AVMEDIA_TYPE_VIDEO]),

                                NULL, 0);

    if (show_status) {

        av_dump_format(ic, 0, is->filename, 0);

    }



    is->show_mode = show_mode;



    /* open the streams */

    if (st_index[AVMEDIA_TYPE_AUDIO] >= 0) {

        stream_component_open(is, st_index[AVMEDIA_TYPE_AUDIO]);

    }



    ret = -1;

    if (st_index[AVMEDIA_TYPE_VIDEO] >= 0) {

        ret = stream_component_open(is, st_index[AVMEDIA_TYPE_VIDEO]);

    }

    if (is->show_mode == SHOW_MODE_NONE)

        is->show_mode = ret >= 0 ? SHOW_MODE_VIDEO : SHOW_MODE_RDFT;



    is->refresh_tid = SDL_CreateThread(refresh_thread, is);



    if (st_index[AVMEDIA_TYPE_SUBTITLE] >= 0) {

        stream_component_open(is, st_index[AVMEDIA_TYPE_SUBTITLE]);

    }



    if (is->video_stream < 0 && is->audio_stream < 0) {

        fprintf(stderr, "%s: could not open codecs\n", is->filename);

        ret = -1;

        goto fail;

    }



    if (infinite_buffer < 0 && is->realtime)

        infinite_buffer = 1;



    for (;;) {

        if (is->abort_request)

            break;

        if (is->paused != is->last_paused) {

            is->last_paused = is->paused;

            if (is->paused)

                is->read_pause_return = av_read_pause(ic);

            else

                av_read_play(ic);

        }

#if CONFIG_RTSP_DEMUXER || CONFIG_MMSH_PROTOCOL

        if (is->paused &&

                (!strcmp(ic->iformat->name, "rtsp") ||

                 (ic->pb && !strncmp(input_filename, "mmsh:", 5)))) {

            /* wait 10 ms to avoid trying to get another packet */

            /* XXX: horrible */

            SDL_Delay(10);

            continue;

        }

#endif

        if (is->seek_req) {

            int64_t seek_target = is->seek_pos;

            int64_t seek_min    = is->seek_rel > 0 ? seek_target - is->seek_rel + 2: INT64_MIN;

            int64_t seek_max    = is->seek_rel < 0 ? seek_target - is->seek_rel - 2: INT64_MAX;

// FIXME the +-2 is due to rounding being not done in the correct direction in generation

//      of the seek_pos/seek_rel variables



            ret = avformat_seek_file(is->ic, -1, seek_min, seek_target, seek_max, is->seek_flags);

            if (ret < 0) {

                fprintf(stderr, "%s: error while seeking\n", is->ic->filename);

            } else {

                if (is->audio_stream >= 0) {

                    packet_queue_flush(&is->audioq);

                    packet_queue_put(&is->audioq, &flush_pkt);

                }

                if (is->subtitle_stream >= 0) {

                    packet_queue_flush(&is->subtitleq);

                    packet_queue_put(&is->subtitleq, &flush_pkt);

                }

                if (is->video_stream >= 0) {

                    packet_queue_flush(&is->videoq);

                    packet_queue_put(&is->videoq, &flush_pkt);

                }

                if (is->seek_flags & AVSEEK_FLAG_BYTE) {

                   //FIXME: use a cleaner way to signal obsolete external clock...

                   update_external_clock_pts(is, (double)AV_NOPTS_VALUE);

                } else {

                   update_external_clock_pts(is, seek_target / (double)AV_TIME_BASE);

                }

            }

            is->seek_req = 0;

            eof = 0;

            if (is->paused)

                step_to_next_frame(is);

        }

        if (is->queue_attachments_req) {

            avformat_queue_attached_pictures(ic);

            is->queue_attachments_req = 0;

        }



        /* if the queue are full, no need to read more */

        if (infinite_buffer<1 &&

              (is->audioq.size + is->videoq.size + is->subtitleq.size > MAX_QUEUE_SIZE

            || (   (is->audioq   .nb_packets > MIN_FRAMES || is->audio_stream < 0 || is->audioq.abort_request)

                && (is->videoq   .nb_packets > MIN_FRAMES || is->video_stream < 0 || is->videoq.abort_request)

                && (is->subtitleq.nb_packets > MIN_FRAMES || is->subtitle_stream < 0 || is->subtitleq.abort_request)))) {

            /* wait 10 ms */

            SDL_LockMutex(wait_mutex);

            SDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 10);

            SDL_UnlockMutex(wait_mutex);

            continue;

        }

        if (eof) {

            if (is->video_stream >= 0) {

                av_init_packet(pkt);

                pkt->data = NULL;

                pkt->size = 0;

                pkt->stream_index = is->video_stream;

                packet_queue_put(&is->videoq, pkt);

            }

            if (is->audio_stream >= 0 &&

                is->audio_st->codec->codec->capabilities & CODEC_CAP_DELAY) {

                av_init_packet(pkt);

                pkt->data = NULL;

                pkt->size = 0;

                pkt->stream_index = is->audio_stream;

                packet_queue_put(&is->audioq, pkt);

            }

            SDL_Delay(10);

            if (is->audioq.size + is->videoq.size + is->subtitleq.size == 0) {

                if (loop != 1 && (!loop || --loop)) {

                    stream_seek(is, start_time != AV_NOPTS_VALUE ? start_time : 0, 0, 0);

                } else if (autoexit) {

                    ret = AVERROR_EOF;

                    goto fail;

                }

            }

            eof=0;

            continue;

        }

        ret = av_read_frame(ic, pkt);

        if (ret < 0) {

            if (ret == AVERROR_EOF || url_feof(ic->pb))

                eof = 1;

            if (ic->pb && ic->pb->error)

                break;

            SDL_LockMutex(wait_mutex);

            SDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 10);

            SDL_UnlockMutex(wait_mutex);

            continue;

        }

        /* check if packet is in play range specified by user, then queue, otherwise discard */

        pkt_in_play_range = duration == AV_NOPTS_VALUE ||

                (pkt->pts - ic->streams[pkt->stream_index]->start_time) *

                av_q2d(ic->streams[pkt->stream_index]->time_base) -

                (double)(start_time != AV_NOPTS_VALUE ? start_time : 0) / 1000000

                <= ((double)duration / 1000000);

        if (pkt->stream_index == is->audio_stream && pkt_in_play_range) {

            packet_queue_put(&is->audioq, pkt);

        } else if (pkt->stream_index == is->video_stream && pkt_in_play_range) {

            packet_queue_put(&is->videoq, pkt);

        } else if (pkt->stream_index == is->subtitle_stream && pkt_in_play_range) {

            packet_queue_put(&is->subtitleq, pkt);

        } else {

            av_free_packet(pkt);

        }

    }

    /* wait until the end */

    while (!is->abort_request) {

        SDL_Delay(100);

    }



    ret = 0;

 fail:

    /* close each stream */

    if (is->audio_stream >= 0)

        stream_component_close(is, is->audio_stream);

    if (is->video_stream >= 0)

        stream_component_close(is, is->video_stream);

    if (is->subtitle_stream >= 0)

        stream_component_close(is, is->subtitle_stream);

    if (is->ic) {

        avformat_close_input(&is->ic);

    }



    if (ret != 0) {

        SDL_Event event;



        event.type = FF_QUIT_EVENT;

        event.user.data1 = is;

        SDL_PushEvent(&event);

    }

    SDL_DestroyMutex(wait_mutex);

    return 0;

}
