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;

    int64_t stream_start_time;

    int pkt_in_play_range = 0;

    AVDictionaryEntry *t;

    AVDictionary **opts;

    int orig_nb_streams;

    SDL_mutex *wait_mutex = SDL_CreateMutex();

    int scan_all_pmts_set = 0;

    int64_t pkt_ts;



    if (!wait_mutex) {

        av_log(NULL, AV_LOG_FATAL, "SDL_CreateMutex(): %s\n", SDL_GetError());

        ret = AVERROR(ENOMEM);

        goto fail;

    }



    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;

    is->eof = 0;



    ic = avformat_alloc_context();

    if (!ic) {

        av_log(NULL, AV_LOG_FATAL, "Could not allocate context.\n");

        ret = AVERROR(ENOMEM);

        goto fail;

    }

    ic->interrupt_callback.callback = decode_interrupt_cb;

    ic->interrupt_callback.opaque = is;

    if (!av_dict_get(format_opts, "scan_all_pmts", NULL, AV_DICT_MATCH_CASE)) {

        av_dict_set(&format_opts, "scan_all_pmts", "1", AV_DICT_DONT_OVERWRITE);

        scan_all_pmts_set = 1;

    }

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

    if (err < 0) {

        print_error(is->filename, err);

        ret = -1;

        goto fail;

    }

    if (scan_all_pmts_set)

        av_dict_set(&format_opts, "scan_all_pmts", NULL, AV_DICT_MATCH_CASE);



    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;



    av_format_inject_global_side_data(ic);



    opts = setup_find_stream_info_opts(ic, codec_opts);

    orig_nb_streams = ic->nb_streams;



    err = avformat_find_stream_info(ic, opts);



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

        av_dict_free(&opts[i]);

    av_freep(&opts);



    if (err < 0) {

        av_log(NULL, AV_LOG_WARNING,

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

        ret = -1;

        goto fail;

    }



    if (ic->pb)

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



    if (seek_by_bytes < 0)

        seek_by_bytes = !!(ic->iformat->flags & AVFMT_TS_DISCONT) && strcmp("ogg", ic->iformat->name);



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



    if (!window_title && (t = av_dict_get(ic->metadata, "title", NULL, 0)))

        window_title = av_asprintf("%s - %s", t->value, input_filename);



    /* 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) {

            av_log(NULL, AV_LOG_WARNING, "%s: could not seek to position %0.3f\n",

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

        }

    }



    is->realtime = is_realtime(ic);



    if (show_status)

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



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

        AVStream *st = ic->streams[i];

        enum AVMediaType type = st->codec->codec_type;

        st->discard = AVDISCARD_ALL;

        if (wanted_stream_spec[type] && st_index[type] == -1)

            if (avformat_match_stream_specifier(ic, st, wanted_stream_spec[type]) > 0)

                st_index[type] = i;

    }

    for (i = 0; i < AVMEDIA_TYPE_NB; i++) {

        if (wanted_stream_spec[i] && st_index[i] == -1) {

            av_log(NULL, AV_LOG_ERROR, "Stream specifier %s does not match any %s stream\n", wanted_stream_spec[i], av_get_media_type_string(i));

            st_index[i] = INT_MAX;

        }

    }



    if (!video_disable)

        st_index[AVMEDIA_TYPE_VIDEO] =

            av_find_best_stream(ic, AVMEDIA_TYPE_VIDEO,

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

    if (!audio_disable)

        st_index[AVMEDIA_TYPE_AUDIO] =

            av_find_best_stream(ic, AVMEDIA_TYPE_AUDIO,

                                st_index[AVMEDIA_TYPE_AUDIO],

                                st_index[AVMEDIA_TYPE_VIDEO],

                                NULL, 0);

    if (!video_disable && !subtitle_disable)

        st_index[AVMEDIA_TYPE_SUBTITLE] =

            av_find_best_stream(ic, AVMEDIA_TYPE_SUBTITLE,

                                st_index[AVMEDIA_TYPE_SUBTITLE],

                                (st_index[AVMEDIA_TYPE_AUDIO] >= 0 ?

                                 st_index[AVMEDIA_TYPE_AUDIO] :

                                 st_index[AVMEDIA_TYPE_VIDEO]),

                                NULL, 0);



    is->show_mode = show_mode;

    if (st_index[AVMEDIA_TYPE_VIDEO] >= 0) {

        AVStream *st = ic->streams[st_index[AVMEDIA_TYPE_VIDEO]];

        AVCodecContext *avctx = st->codec;

        AVRational sar = av_guess_sample_aspect_ratio(ic, st, NULL);

        if (avctx->width)

            set_default_window_size(avctx->width, avctx->height, sar);

    }



    /* 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;



    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) {

        av_log(NULL, AV_LOG_FATAL, "Failed to open file '%s' or configure filtergraph\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) {

                av_log(NULL, AV_LOG_ERROR,

                       "%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) {

                   set_clock(&is->extclk, NAN, 0);

                } else {

                   set_clock(&is->extclk, seek_target / (double)AV_TIME_BASE, 0);

                }

            }

            is->seek_req = 0;

            is->queue_attachments_req = 1;

            is->eof = 0;

            if (is->paused)

                step_to_next_frame(is);

        }

        if (is->queue_attachments_req) {

            if (is->video_st && is->video_st->disposition & AV_DISPOSITION_ATTACHED_PIC) {

                AVPacket copy;

                if ((ret = av_copy_packet(&copy, &is->video_st->attached_pic)) < 0)

                    goto fail;

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

                packet_queue_put_nullpacket(&is->videoq, is->video_stream);

            }

            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->video_st->disposition & AV_DISPOSITION_ATTACHED_PIC))

                && (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 (!is->paused &&

            (!is->audio_st || (is->auddec.finished == is->audioq.serial && frame_queue_nb_remaining(&is->sampq) == 0)) &&

            (!is->video_st || (is->viddec.finished == is->videoq.serial && frame_queue_nb_remaining(&is->pictq) == 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;

            }

        }

        ret = av_read_frame(ic, pkt);

        if (ret < 0) {

            if ((ret == AVERROR_EOF || avio_feof(ic->pb)) && !is->eof) {

                if (is->video_stream >= 0)

                    packet_queue_put_nullpacket(&is->videoq, is->video_stream);

                if (is->audio_stream >= 0)

                    packet_queue_put_nullpacket(&is->audioq, is->audio_stream);

                if (is->subtitle_stream >= 0)

                    packet_queue_put_nullpacket(&is->subtitleq, is->subtitle_stream);

                is->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;

        } else {

            is->eof = 0;

        }

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

        stream_start_time = ic->streams[pkt->stream_index]->start_time;

        pkt_ts = pkt->pts == AV_NOPTS_VALUE ? pkt->dts : pkt->pts;

        pkt_in_play_range = duration == AV_NOPTS_VALUE ||

                (pkt_ts - (stream_start_time != AV_NOPTS_VALUE ? stream_start_time : 0)) *

                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

                   && !(is->video_st->disposition & AV_DISPOSITION_ATTACHED_PIC)) {

            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 (ic) {

        avformat_close_input(&ic);

        is->ic = NULL;

    }



    if (ret != 0) {

        SDL_Event event;



        event.type = FF_QUIT_EVENT;

        event.user.data1 = is;

        SDL_PushEvent(&event);

    }

    SDL_DestroyMutex(wait_mutex);

    return 0;

}
