ffmpeg.c

    if (!init) {
        /* we already know the mappings between lavfi outputs and output streams,
         * so we can finish the setup */
        for (cur = outputs, i = 0; cur; cur = cur->next, i++)
            configure_output_filter(fg, fg->outputs[i], cur);
        avfilter_inout_free(&outputs);

        if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
            return ret;
    } else {
        /* wait until output mappings are processed */
        for (cur = outputs; cur;) {
            fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs),
                                     &fg->nb_outputs, fg->nb_outputs + 1);
            if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
                exit_program(1);
            fg->outputs[fg->nb_outputs - 1]->graph   = fg;
            fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
            cur = cur->next;
            fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
        }
    }

    return 0;
}

static int configure_complex_filters(void)
{
    int i, ret = 0;

    for (i = 0; i < nb_filtergraphs; i++)
        if (!filtergraphs[i]->graph &&
            (ret = configure_complex_filter(filtergraphs[i])) < 0)
            return ret;
    return 0;
}

static int configure_filtergraph(FilterGraph *fg)
{
    return fg->graph_desc ? configure_complex_filter(fg) : configure_video_filters(fg);
}

static int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
{
    int i;
    for (i = 0; i < fg->nb_inputs; i++)
        if (fg->inputs[i]->ist == ist)
            return 1;
    return 0;
}

static void term_exit(void)
{
    av_log(NULL, AV_LOG_QUIET, "%s", "");
#if HAVE_TERMIOS_H
    if(restore_tty)
        tcsetattr (0, TCSANOW, &oldtty);
#endif
}

static volatile int received_sigterm = 0;

static void sigterm_handler(int sig)
{
    received_sigterm = sig;
    received_nb_signals++;
    term_exit();
    if(received_nb_signals > 3)
        exit(123);
}

static void term_init(void)
{
#if HAVE_TERMIOS_H
    if(!run_as_daemon){
    struct termios tty;

    if (tcgetattr (0, &tty) == 0) {
    oldtty = tty;
    restore_tty = 1;
    atexit(term_exit);

    tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
                          |INLCR|IGNCR|ICRNL|IXON);
    tty.c_oflag |= OPOST;
    tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
    tty.c_cflag &= ~(CSIZE|PARENB);
    tty.c_cflag |= CS8;
    tty.c_cc[VMIN] = 1;
    tty.c_cc[VTIME] = 0;

    tcsetattr (0, TCSANOW, &tty);
    }
    signal(SIGQUIT, sigterm_handler); /* Quit (POSIX).  */
    }
#endif
    avformat_network_deinit();

    signal(SIGINT , sigterm_handler); /* Interrupt (ANSI).    */
    signal(SIGTERM, sigterm_handler); /* Termination (ANSI).  */
#ifdef SIGXCPU
    signal(SIGXCPU, sigterm_handler);
#endif
}

/* read a key without blocking */
static int read_key(void)
{
    unsigned char ch;
#if HAVE_TERMIOS_H
    int n = 1;
    struct timeval tv;
    fd_set rfds;

    FD_ZERO(&rfds);
    FD_SET(0, &rfds);
    tv.tv_sec = 0;
    tv.tv_usec = 0;
    n = select(1, &rfds, NULL, NULL, &tv);
    if (n > 0) {
        n = read(0, &ch, 1);
        if (n == 1)
            return ch;

        return n;
    }
#elif HAVE_KBHIT
#    if HAVE_PEEKNAMEDPIPE
    static int is_pipe;
    static HANDLE input_handle;
    DWORD dw, nchars;
    if(!input_handle){
        input_handle = GetStdHandle(STD_INPUT_HANDLE);
        is_pipe = !GetConsoleMode(input_handle, &dw);
    }

    if (stdin->_cnt > 0) {
        read(0, &ch, 1);
        return ch;
    }
    if (is_pipe) {
        /* When running under a GUI, you will end here. */
        if (!PeekNamedPipe(input_handle, NULL, 0, NULL, &nchars, NULL))
            return -1;
        //Read it
        if(nchars != 0) {
            read(0, &ch, 1);
            return ch;
        }else{
            return -1;
        }
    }
#    endif
    if(kbhit())
        return(getch());
#endif
    return -1;
}

static int decode_interrupt_cb(void *ctx)
{
    return received_nb_signals > 1;
}

static const AVIOInterruptCB int_cb = { decode_interrupt_cb, NULL };

void av_noreturn exit_program(int ret)
{
    int i, j;

    for (i = 0; i < nb_filtergraphs; i++) {
        avfilter_graph_free(&filtergraphs[i]->graph);
        for (j = 0; j < filtergraphs[i]->nb_inputs; j++)
            av_freep(&filtergraphs[i]->inputs[j]);
        av_freep(&filtergraphs[i]->inputs);
        for (j = 0; j < filtergraphs[i]->nb_outputs; j++)
            av_freep(&filtergraphs[i]->outputs[j]);
        av_freep(&filtergraphs[i]->outputs);
        av_freep(&filtergraphs[i]);
    }
    av_freep(&filtergraphs);

    /* close files */
    for (i = 0; i < nb_output_files; i++) {
        AVFormatContext *s = output_files[i]->ctx;
        if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
            avio_close(s->pb);
        avformat_free_context(s);
        av_dict_free(&output_files[i]->opts);
        av_freep(&output_files[i]);
    }
    for (i = 0; i < nb_output_streams; i++) {
        AVBitStreamFilterContext *bsfc = output_streams[i]->bitstream_filters;
        while (bsfc) {
            AVBitStreamFilterContext *next = bsfc->next;
            av_bitstream_filter_close(bsfc);
            bsfc = next;
        }
        output_streams[i]->bitstream_filters = NULL;

        if (output_streams[i]->output_frame) {
            AVFrame *frame = output_streams[i]->output_frame;
            if (frame->extended_data != frame->data)
                av_freep(&frame->extended_data);
            av_freep(&frame);
        }
        av_freep(&output_streams[i]->filtered_frame);
        av_freep(&output_streams[i]);
    }
    for (i = 0; i < nb_input_files; i++) {
        avformat_close_input(&input_files[i]->ctx);
        av_freep(&input_files[i]);
    }
    for (i = 0; i < nb_input_streams; i++) {
        av_freep(&input_streams[i]->decoded_frame);
        av_dict_free(&input_streams[i]->opts);
        free_buffer_pool(input_streams[i]);
        av_freep(&input_streams[i]->filters);
        av_freep(&input_streams[i]);
    }

    if (vstats_file)
        fclose(vstats_file);
    av_free(vstats_filename);

    av_freep(&input_streams);
    av_freep(&input_files);
    av_freep(&output_streams);
    av_freep(&output_files);

    uninit_opts();
    av_freep(&audio_buf);
    allocated_audio_buf_size = 0;
    av_freep(&async_buf);
    allocated_async_buf_size = 0;

    avfilter_uninit();
    avformat_network_deinit();

    if (received_sigterm) {
        av_log(NULL, AV_LOG_INFO, "Received signal %d: terminating.\n",
               (int) received_sigterm);
        exit (255);
    }

    exit(ret); /* not all OS-es handle main() return value */
}

static void assert_avoptions(AVDictionary *m)
{
    AVDictionaryEntry *t;
    if ((t = av_dict_get(m, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
        av_log(NULL, AV_LOG_FATAL, "Option %s not found.\n", t->key);
        exit_program(1);
    }
}

static void assert_codec_experimental(AVCodecContext *c, int encoder)
{
    const char *codec_string = encoder ? "encoder" : "decoder";
    AVCodec *codec;
    if (c->codec->capabilities & CODEC_CAP_EXPERIMENTAL &&
        c->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
        av_log(NULL, AV_LOG_FATAL, "%s '%s' is experimental and might produce bad "
                "results.\nAdd '-strict experimental' if you want to use it.\n",
                codec_string, c->codec->name);
        codec = encoder ? avcodec_find_encoder(c->codec->id) : avcodec_find_decoder(c->codec->id);
        if (!(codec->capabilities & CODEC_CAP_EXPERIMENTAL))
            av_log(NULL, AV_LOG_FATAL, "Or use the non experimental %s '%s'.\n",
                   codec_string, codec->name);
        exit_program(1);
    }
}

static void choose_sample_fmt(AVStream *st, AVCodec *codec)
{
    if (codec && codec->sample_fmts) {
        const enum AVSampleFormat *p = codec->sample_fmts;
        for (; *p != -1; p++) {
            if (*p == st->codec->sample_fmt)
                break;
        }
        if (*p == -1) {
            if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
                av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
            if(av_get_sample_fmt_name(st->codec->sample_fmt))
            av_log(NULL, AV_LOG_WARNING,
                   "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
                   av_get_sample_fmt_name(st->codec->sample_fmt),
                   codec->name,
                   av_get_sample_fmt_name(codec->sample_fmts[0]));
            st->codec->sample_fmt = codec->sample_fmts[0];
        }
    }
}

static void choose_sample_rate(AVStream *st, AVCodec *codec)
{
    if (codec && codec->supported_samplerates) {
        const int *p  = codec->supported_samplerates;
        int best      = 0;
        int best_dist = INT_MAX;
        for (; *p; p++) {
            int dist = abs(st->codec->sample_rate - *p);
            if (dist < best_dist) {
                best_dist = dist;
                best      = *p;
            }
        }
        if (best_dist) {
            int i;
            const int *sample_rates = codec->supported_samplerates;
            av_log(st->codec, AV_LOG_WARNING,
                   "Requested sampling rate (%dHz) unsupported, using %dHz instead\n"
                   "Available sampling rates for %s:",
                   st->codec->sample_rate, best, codec->name);
            for (i = 0; sample_rates[i]; i++) {
                if (!sample_rates[i + 1]) av_log(st->codec, AV_LOG_WARNING, " and");
                else if (i)               av_log(st->codec, AV_LOG_WARNING, ",");
                av_log(st->codec, AV_LOG_WARNING, " %d", sample_rates[i]);
            }
            av_log(st->codec, AV_LOG_WARNING, ".\n");
        }
        st->codec->sample_rate = best;
    }
}

static double
get_sync_ipts(const OutputStream *ost, int64_t pts)
{
    OutputFile *of = output_files[ost->file_index];
    return (double)(pts - of->start_time) / AV_TIME_BASE;
}

static void write_frame(AVFormatContext *s, AVPacket *pkt, OutputStream *ost)
{
    AVBitStreamFilterContext *bsfc = ost->bitstream_filters;
    AVCodecContext          *avctx = ost->st->codec;
    int ret;

    if ((avctx->codec_type == AVMEDIA_TYPE_VIDEO && video_sync_method == VSYNC_DROP) ||
        (avctx->codec_type == AVMEDIA_TYPE_AUDIO && audio_sync_method < 0))
        pkt->pts = pkt->dts = AV_NOPTS_VALUE;

    /*
     * Audio encoders may split the packets --  #frames in != #packets out.
     * But there is no reordering, so we can limit the number of output packets
     * by simply dropping them here.
     * Counting encoded video frames needs to be done separately because of
     * reordering, see do_video_out()
     */
    if (!(avctx->codec_type == AVMEDIA_TYPE_VIDEO && avctx->codec)) {
        if (ost->frame_number >= ost->max_frames) {
            av_free_packet(pkt);
            return;
        }
        ost->frame_number++;
    }

    while (bsfc) {
        AVPacket new_pkt = *pkt;
        int a = av_bitstream_filter_filter(bsfc, avctx, NULL,
                                           &new_pkt.data, &new_pkt.size,
                                           pkt->data, pkt->size,
                                           pkt->flags & AV_PKT_FLAG_KEY);
        if (a > 0) {
            av_free_packet(pkt);
            new_pkt.destruct = av_destruct_packet;
        } else if (a < 0) {
            av_log(NULL, AV_LOG_ERROR, "Failed to open bitstream filter %s for stream %d with codec %s",
                   bsfc->filter->name, pkt->stream_index,
                   avctx->codec ? avctx->codec->name : "copy");
            print_error("", a);
            if (exit_on_error)
                exit_program(1);
        }
        *pkt = new_pkt;

        bsfc = bsfc->next;
    }

    pkt->stream_index = ost->index;
    ret = av_interleaved_write_frame(s, pkt);
    if (ret < 0) {
        print_error("av_interleaved_write_frame()", ret);
        exit_program(1);
    }
}

static void get_default_channel_layouts(OutputStream *ost, InputStream *ist)
{
    char layout_name[256];
    AVCodecContext *enc = ost->st->codec;
    AVCodecContext *dec = ist->st->codec;

    if (dec->channel_layout &&
        av_get_channel_layout_nb_channels(dec->channel_layout) != dec->channels) {
        av_get_channel_layout_string(layout_name, sizeof(layout_name),
                                     dec->channels, dec->channel_layout);
        av_log(NULL, AV_LOG_ERROR, "New channel layout (%s) is invalid\n",
               layout_name);
        dec->channel_layout = 0;
    }
    if (!dec->channel_layout) {
        if (enc->channel_layout && dec->channels == enc->channels) {
            dec->channel_layout = enc->channel_layout;
        } else {
            dec->channel_layout = av_get_default_channel_layout(dec->channels);

            if (!dec->channel_layout) {
                av_log(NULL, AV_LOG_FATAL, "Unable to find default channel "
                       "layout for Input Stream #%d.%d\n", ist->file_index,
                       ist->st->index);
                exit_program(1);
            }
        }
        av_get_channel_layout_string(layout_name, sizeof(layout_name),
                                     dec->channels, dec->channel_layout);
        av_log(NULL, AV_LOG_WARNING, "Guessed Channel Layout for  Input Stream "
               "#%d.%d : %s\n", ist->file_index, ist->st->index, layout_name);
    }
    if (!enc->channel_layout) {
        if (dec->channels == enc->channels) {
            enc->channel_layout = dec->channel_layout;
            return;
        } else {
            enc->channel_layout = av_get_default_channel_layout(enc->channels);
        }
        if (!enc->channel_layout) {
            av_log(NULL, AV_LOG_FATAL, "Unable to find default channel layout "
                   "for Output Stream #%d.%d\n", ost->file_index,
                   ost->st->index);
            exit_program(1);
        }
        av_get_channel_layout_string(layout_name, sizeof(layout_name),
                                     enc->channels, enc->channel_layout);
        av_log(NULL, AV_LOG_WARNING, "Guessed Channel Layout for Output Stream "
               "#%d.%d : %s\n", ost->file_index, ost->st->index, layout_name);
    }
}

static void generate_silence(uint8_t* buf, enum AVSampleFormat sample_fmt, size_t size)
{
    int fill_char = 0x00;
    if (sample_fmt == AV_SAMPLE_FMT_U8)
        fill_char = 0x80;
    memset(buf, fill_char, size);
}

static int encode_audio_frame(AVFormatContext *s, OutputStream *ost,
                              const uint8_t *buf, int buf_size)
{
    AVCodecContext *enc = ost->st->codec;
    AVFrame *frame = NULL;
    AVPacket pkt;
    int ret, got_packet;

    av_init_packet(&pkt);
    pkt.data = NULL;
    pkt.size = 0;

    if (buf && buf_size) {
        if (!ost->output_frame) {
            ost->output_frame = avcodec_alloc_frame();
            if (!ost->output_frame) {
                av_log(NULL, AV_LOG_FATAL, "out-of-memory in encode_audio_frame()\n");
                exit_program(1);
            }
        }
        frame = ost->output_frame;
        if (frame->extended_data != frame->data)
            av_freep(&frame->extended_data);
        avcodec_get_frame_defaults(frame);

        frame->nb_samples  = buf_size /
                             (enc->channels * av_get_bytes_per_sample(enc->sample_fmt));
        if ((ret = avcodec_fill_audio_frame(frame, enc->channels, enc->sample_fmt,
                                            buf, buf_size, 1)) < 0) {
            av_log(NULL, AV_LOG_FATAL, "Audio encoding failed (avcodec_fill_audio_frame)\n");
            exit_program(1);
        }

        frame->pts = ost->sync_opts;
        ost->sync_opts += frame->nb_samples;
    }

    got_packet = 0;
    update_benchmark(NULL);
    if (avcodec_encode_audio2(enc, &pkt, frame, &got_packet) < 0) {
        av_log(NULL, AV_LOG_FATAL, "Audio encoding failed (avcodec_encode_audio2)\n");
        exit_program(1);
    }
    update_benchmark("encode_audio %d.%d", ost->file_index, ost->index);

    ret = pkt.size;

    if (got_packet) {
        if (pkt.pts != AV_NOPTS_VALUE)
            pkt.pts      = av_rescale_q(pkt.pts,      enc->time_base, ost->st->time_base);
        if (pkt.dts != AV_NOPTS_VALUE) {
            int64_t max = ost->st->cur_dts + !(s->oformat->flags & AVFMT_TS_NONSTRICT);
            pkt.dts      = av_rescale_q(pkt.dts,      enc->time_base, ost->st->time_base);
            if (ost->st->cur_dts && ost->st->cur_dts != AV_NOPTS_VALUE &&  max > pkt.dts) {
                av_log(s, max - pkt.dts > 2 ? AV_LOG_WARNING : AV_LOG_DEBUG, "Audio timestamp %"PRId64" < %"PRId64" invalid, cliping\n", pkt.dts, max);
                pkt.pts = pkt.dts = max;
            }
        }
        if (pkt.duration > 0)
            pkt.duration = av_rescale_q(pkt.duration, enc->time_base, ost->st->time_base);

        write_frame(s, &pkt, ost);

        audio_size += pkt.size;

        av_free_packet(&pkt);
    }

    if (debug_ts) {
        av_log(NULL, AV_LOG_INFO, "encoder -> type:audio "
               "pkt_pts:%s pkt_pts_time:%s pkt_dts:%s pkt_dts_time:%s\n",
               av_ts2str(pkt.pts), av_ts2timestr(pkt.pts, &ost->st->time_base),
               av_ts2str(pkt.dts), av_ts2timestr(pkt.dts, &ost->st->time_base));
    }

    return ret;
}

static int alloc_audio_output_buf(AVCodecContext *dec, AVCodecContext *enc,
                                  int nb_samples, int *buf_linesize)
{
    int64_t audio_buf_samples;
    int audio_buf_size;

    /* calculate required number of samples to allocate */
    audio_buf_samples = ((int64_t)nb_samples * enc->sample_rate + dec->sample_rate) /
                        dec->sample_rate;
    audio_buf_samples = 4 * audio_buf_samples + 10000; // safety factors for resampling
    audio_buf_samples = FFMAX(audio_buf_samples, enc->frame_size);
    if (audio_buf_samples > INT_MAX)
        return AVERROR(EINVAL);

    audio_buf_size = av_samples_get_buffer_size(buf_linesize, enc->channels,
                                                audio_buf_samples,
                                                enc->sample_fmt, 0);
    if (audio_buf_size < 0)
        return audio_buf_size;

    av_fast_malloc(&audio_buf, &allocated_audio_buf_size, audio_buf_size);
    if (!audio_buf)
        return AVERROR(ENOMEM);

    return 0;
}

static void do_audio_out(AVFormatContext *s, OutputStream *ost,
                         InputStream *ist, AVFrame *decoded_frame)
{
    uint8_t *buftmp;
    int64_t size_out;

    int frame_bytes, resample_changed, ret;
    AVCodecContext *enc = ost->st->codec;
    AVCodecContext *dec = ist->st->codec;
    int osize = av_get_bytes_per_sample(enc->sample_fmt);
    int isize = av_get_bytes_per_sample(dec->sample_fmt);
    uint8_t *buf[AV_NUM_DATA_POINTERS];
    int size     = decoded_frame->nb_samples * dec->channels * isize;
    int planes   = av_sample_fmt_is_planar(dec->sample_fmt) ? dec->channels : 1;
    int i;
    int out_linesize = 0;
    int buf_linesize = decoded_frame->linesize[0];

    av_assert0(planes <= AV_NUM_DATA_POINTERS);

    for(i=0; i<planes; i++)
        buf[i]= decoded_frame->data[i];


    get_default_channel_layouts(ost, ist);

    if (alloc_audio_output_buf(dec, enc, decoded_frame->nb_samples, &out_linesize) < 0) {
        av_log(NULL, AV_LOG_FATAL, "Error allocating audio buffer\n");
        exit_program(1);
    }

    if (audio_sync_method > 1                      ||
        enc->channels       != dec->channels       ||
        enc->channel_layout != dec->channel_layout ||
        enc->sample_rate    != dec->sample_rate    ||
        dec->sample_fmt     != enc->sample_fmt)
        ost->audio_resample = 1;

    resample_changed = ost->resample_sample_fmt  != dec->sample_fmt ||
                       ost->resample_channels    != dec->channels   ||
                       ost->resample_channel_layout != dec->channel_layout ||
                       ost->resample_sample_rate != dec->sample_rate;

    if ((ost->audio_resample && !ost->swr) || resample_changed || ost->audio_channels_mapped) {

        if (resample_changed) {
            av_log(NULL, AV_LOG_INFO, "Input stream #%d:%d frame changed from rate:%d fmt:%s ch:%d chl:0x%"PRIx64" to rate:%d fmt:%s ch:%d chl:0x%"PRIx64"\n",
                   ist->file_index, ist->st->index,
                   ost->resample_sample_rate, av_get_sample_fmt_name(ost->resample_sample_fmt),
                   ost->resample_channels, ost->resample_channel_layout,
                   dec->sample_rate, av_get_sample_fmt_name(dec->sample_fmt),
                   dec->channels, dec->channel_layout);
            ost->resample_sample_fmt  = dec->sample_fmt;
            ost->resample_channels    = dec->channels;
            ost->resample_channel_layout = dec->channel_layout;
            ost->resample_sample_rate = dec->sample_rate;
            swr_free(&ost->swr);
        }
        /* if audio_sync_method is >1 the resampler is needed for audio drift compensation */
        if (audio_sync_method <= 1 && !ost->audio_channels_mapped &&
            ost->resample_sample_fmt  == enc->sample_fmt &&
            ost->resample_channels    == enc->channels   &&
            ost->resample_channel_layout == enc->channel_layout &&
            ost->resample_sample_rate == enc->sample_rate) {
            //ost->swr = NULL;
            ost->audio_resample = 0;
        } else {
            ost->swr = swr_alloc_set_opts(ost->swr,
                                          enc->channel_layout, enc->sample_fmt, enc->sample_rate,
                                          dec->channel_layout, dec->sample_fmt, dec->sample_rate,
                                          0, NULL);
            av_opt_set_int(ost->swr, "dither_method", ost->swr_dither_method,0);
            av_opt_set_double(ost->swr, "dither_scale", ost->swr_dither_scale,0);
            if (ost->audio_channels_mapped)
                swr_set_channel_mapping(ost->swr, ost->audio_channels_map);
            av_opt_set_double(ost->swr, "rmvol", ost->rematrix_volume, 0);
            if (ost->audio_channels_mapped) {
                av_opt_set_int(ost->swr, "icl", av_get_default_channel_layout(ost->audio_channels_mapped), 0);
                av_opt_set_int(ost->swr, "uch", ost->audio_channels_mapped, 0);
            }
            if (av_opt_set_int(ost->swr, "ich", dec->channels, 0) < 0) {
                av_log(NULL, AV_LOG_FATAL, "Unsupported number of input channels\n");
                exit_program(1);
            }
            if (av_opt_set_int(ost->swr, "och", enc->channels, 0) < 0) {
                av_log(NULL, AV_LOG_FATAL, "Unsupported number of output channels\n");
                exit_program(1);
            }
            if(audio_sync_method>1) av_opt_set_int(ost->swr, "flags", SWR_FLAG_RESAMPLE, 0);
            if(ost->swr && swr_init(ost->swr) < 0){
                av_log(NULL, AV_LOG_FATAL, "swr_init() failed\n");
                swr_free(&ost->swr);
            }

            if (!ost->swr) {
                av_log(NULL, AV_LOG_FATAL, "Can not resample %d channels @ %d Hz to %d channels @ %d Hz\n",
                        dec->channels, dec->sample_rate,
                        enc->channels, enc->sample_rate);
                exit_program(1);
            }
        }
    }

    av_assert0(ost->audio_resample || dec->sample_fmt==enc->sample_fmt);

    if (audio_sync_method > 0) {
        double delta = get_sync_ipts(ost, ist->pts) * enc->sample_rate - ost->sync_opts -
                       av_fifo_size(ost->fifo) / (enc->channels * osize);
        int idelta = delta * dec->sample_rate / enc->sample_rate;
        int byte_delta = idelta * isize * dec->channels;

        // FIXME resample delay
        if (fabs(delta) > 50) {
            if (ist->is_start || fabs(delta) > audio_drift_threshold*enc->sample_rate) {
                if (byte_delta < 0) {
                    byte_delta = FFMAX(byte_delta, -size);
                    size += byte_delta;
                    for (i=0; i<planes; i++)
                        buf[i]  -= byte_delta/planes;
                    av_log(NULL, AV_LOG_VERBOSE, "discarding %d audio samples\n",
                           -byte_delta / (isize * dec->channels));
                    if (!size)
                        return;
                    ist->is_start = 0;
                } else {
                    av_fast_malloc(&async_buf, &allocated_async_buf_size,
                                   byte_delta + size);
                    if (!async_buf) {
                        av_log(NULL, AV_LOG_FATAL, "Out of memory in do_audio_out\n");
                        exit_program(1);
                    }

                    if (alloc_audio_output_buf(dec, enc, decoded_frame->nb_samples + idelta, &out_linesize) < 0) {
                        av_log(NULL, AV_LOG_FATAL, "Error allocating audio buffer\n");
                        exit_program(1);
                    }
                    ist->is_start = 0;

                    for (i=0; i<planes; i++) {
                        uint8_t *t = async_buf + i*((byte_delta + size)/planes);
                        generate_silence(t, dec->sample_fmt, byte_delta/planes);
                        memcpy(t + byte_delta/planes, buf[i], size/planes);
                        buf[i] = t;
                    }
                    size += byte_delta;
                    buf_linesize = allocated_async_buf_size;
                    av_log(NULL, AV_LOG_VERBOSE, "adding %d audio samples of silence\n", idelta);
                }
            } else if (audio_sync_method > 1) {
                int comp = av_clip(delta, -audio_sync_method, audio_sync_method);
                av_log(NULL, AV_LOG_VERBOSE, "compensating audio timestamp drift:%f compensation:%d in:%d\n",
                       delta, comp, enc->sample_rate);
//                fprintf(stderr, "drift:%f len:%d opts:%"PRId64" ipts:%"PRId64" fifo:%d\n", delta, -1, ost->sync_opts, (int64_t)(get_sync_ipts(ost) * enc->sample_rate), av_fifo_size(ost->fifo)/(ost->st->codec->channels * 2));
                swr_set_compensation(ost->swr, comp, enc->sample_rate);
            }
        }
    } else if (audio_sync_method == 0)
        ost->sync_opts = lrintf(get_sync_ipts(ost, ist->pts) * enc->sample_rate) -
                                av_fifo_size(ost->fifo) / (enc->channels * osize); // FIXME wrong

    if (ost->audio_resample || ost->audio_channels_mapped) {
        buftmp = audio_buf;
        size_out = swr_convert(ost->swr, (      uint8_t*[]){buftmp},
                                      allocated_audio_buf_size / (enc->channels * osize),
                                      buf,
                                      size / (dec->channels * isize));
        if (size_out < 0) {
            av_log(NULL, AV_LOG_FATAL, "swr_convert failed\n");
            exit_program(1);
        }
        size_out = size_out * enc->channels * osize;
    } else {
        buftmp = buf[0];
        size_out = size;
    }

    av_assert0(ost->audio_resample || dec->sample_fmt==enc->sample_fmt);

    /* now encode as many frames as possible */
    if (!(enc->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)) {
        /* output resampled raw samples */
        if (av_fifo_realloc2(ost->fifo, av_fifo_size(ost->fifo) + size_out) < 0) {
            av_log(NULL, AV_LOG_FATAL, "av_fifo_realloc2() failed\n");
            exit_program(1);
        }
        av_fifo_generic_write(ost->fifo, buftmp, size_out, NULL);

        frame_bytes = enc->frame_size * osize * enc->channels;

        while (av_fifo_size(ost->fifo) >= frame_bytes) {
            av_fifo_generic_read(ost->fifo, audio_buf, frame_bytes, NULL);
            encode_audio_frame(s, ost, audio_buf, frame_bytes);
        }
    } else {
        encode_audio_frame(s, ost, buftmp, size_out);
    }
}

static void pre_process_video_frame(InputStream *ist, AVPicture *picture, void **bufp)
{
    AVCodecContext *dec;
    AVPicture *picture2;
    AVPicture picture_tmp;
    uint8_t *buf = 0;

    dec = ist->st->codec;

    /* deinterlace : must be done before any resize */
    if (do_deinterlace) {
        int size;

        /* create temporary picture */
        size = avpicture_get_size(dec->pix_fmt, dec->width, dec->height);
        buf  = av_malloc(size);
        if (!buf)
            return;

        picture2 = &picture_tmp;
        avpicture_fill(picture2, buf, dec->pix_fmt, dec->width, dec->height);

        if (avpicture_deinterlace(picture2, picture,
                                 dec->pix_fmt, dec->width, dec->height) < 0) {
            /* if error, do not deinterlace */
            av_log(NULL, AV_LOG_WARNING, "Deinterlacing failed\n");
            av_free(buf);
            buf = NULL;
            picture2 = picture;
        }
    } else {
        picture2 = picture;
    }

    if (picture != picture2)
        *picture = *picture2;
    *bufp = buf;
}

static void do_subtitle_out(AVFormatContext *s,
                            OutputStream *ost,
                            InputStream *ist,
                            AVSubtitle *sub,
                            int64_t pts)
{
    static uint8_t *subtitle_out = NULL;
    int subtitle_out_max_size = 1024 * 1024;
    int subtitle_out_size, nb, i;
    AVCodecContext *enc;
    AVPacket pkt;

    if (pts == AV_NOPTS_VALUE) {
        av_log(NULL, AV_LOG_ERROR, "Subtitle packets must have a pts\n");
        if (exit_on_error)
            exit_program(1);
        return;
    }

    enc = ost->st->codec;

    if (!subtitle_out) {
        subtitle_out = av_malloc(subtitle_out_max_size);
    }

    /* Note: DVB subtitle need one packet to draw them and one other
       packet to clear them */
    /* XXX: signal it in the codec context ? */
    if (enc->codec_id == CODEC_ID_DVB_SUBTITLE)
        nb = 2;
    else
        nb = 1;

    for (i = 0; i < nb; i++) {
        ost->sync_opts = av_rescale_q(pts, ist->st->time_base, enc->time_base);

        sub->pts = av_rescale_q(pts, ist->st->time_base, AV_TIME_BASE_Q);
        // start_display_time is required to be 0
        sub->pts               += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, AV_TIME_BASE_Q);
        sub->end_display_time  -= sub->start_display_time;
        sub->start_display_time = 0;
        subtitle_out_size = avcodec_encode_subtitle(enc, subtitle_out,
                                                    subtitle_out_max_size, sub);
        if (subtitle_out_size < 0) {
            av_log(NULL, AV_LOG_FATAL, "Subtitle encoding failed\n");
            exit_program(1);
        }

        av_init_packet(&pkt);
        pkt.data = subtitle_out;
        pkt.size = subtitle_out_size;
        pkt.pts  = av_rescale_q(sub->pts, AV_TIME_BASE_Q, ost->st->time_base);
        if (enc->codec_id == CODEC_ID_DVB_SUBTITLE) {
            /* XXX: the pts correction is handled here. Maybe handling
               it in the codec would be better */
            if (i == 0)
                pkt.pts += 90 * sub->start_display_time;
            else
                pkt.pts += 90 * sub->end_display_time;
        }
        write_frame(s, &pkt, ost);
    }
}

static double psnr(double d)
{
    return -10.0 * log(d) / log(10.0);
}

static void do_video_stats(AVFormatContext *os, OutputStream *ost,
                           int frame_size)
{
    AVCodecContext *enc;
    int frame_number;
    double ti1, bitrate, avg_bitrate;

    /* this is executed just the first time do_video_stats is called */
    if (!vstats_file) {
        vstats_file = fopen(vstats_filename, "w");
        if (!vstats_file) {
            perror("fopen");
            exit_program(1);
        }
    }

    enc = ost->st->codec;
    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
        frame_number = ost->frame_number;
        fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number, enc->coded_frame->quality / (float)FF_QP2LAMBDA);
        if (enc->flags&CODEC_FLAG_PSNR)
            fprintf(vstats_file, "PSNR= %6.2f ", psnr(enc->coded_frame->error[0] / (enc->width * enc->height * 255.0 * 255.0)));

        fprintf(vstats_file,"f_size= %6d ", frame_size);
        /* compute pts value */
        ti1 = ost->sync_opts * av_q2d(enc->time_base);
        if (ti1 < 0.01)
            ti1 = 0.01;

        bitrate     = (frame_size * 8) / av_q2d(enc->time_base) / 1000.0;
        avg_bitrate = (double)(video_size * 8) / ti1 / 1000.0;
        fprintf(vstats_file, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
               (double)video_size / 1024, ti1, bitrate, avg_bitrate);
        fprintf(vstats_file, "type= %c\n", av_get_picture_type_char(enc->coded_frame->pict_type));
    }
}


static void do_video_out(AVFormatContext *s, OutputStream *ost,
                         AVFrame *in_picture, float quality)
{
    int nb_frames, i, ret, format_video_sync;
    AVCodecContext *enc;
    double sync_ipts, delta;
    double duration = 0;
    int frame_size = 0;
    InputStream *ist = NULL;

    if (ost->source_index >= 0)
        ist = input_streams[ost->source_index];

    enc = ost->st->codec;

    if (ist && ist->st->start_time != AV_NOPTS_VALUE && ist->st->first_dts != AV_NOPTS_VALUE) {
        duration = FFMAX(av_q2d(ist->st->time_base), av_q2d(ist->st->codec->time_base));
        if(ist->st->r_frame_rate.num)
            duration= FFMAX(duration, 1/av_q2d(ist->st->r_frame_rate));
        if(ist->st->avg_frame_rate.num && 0)
            duration= FFMAX(duration, 1/av_q2d(ist->st->avg_frame_rate));

        duration /= av_q2d(enc->time_base);
    }

    sync_ipts = get_sync_ipts(ost, in_picture->pts) / av_q2d(enc->time_base);
    delta = sync_ipts - ost->sync_opts + duration;

    /* by default, we output a single frame */
    nb_frames = 1;

    format_video_sync = video_sync_method;
    if (format_video_sync == VSYNC_AUTO)
        format_video_sync = (s->oformat->flags & AVFMT_VARIABLE_FPS) ? ((s->oformat->flags & AVFMT_NOTIMESTAMPS) ? VSYNC_PASSTHROUGH : VSYNC_VFR) : 1;

    switch (format_video_sync) {
    case VSYNC_CFR:
        // FIXME set to 0.5 after we fix some dts/pts bugs like in avidec.c
        if (delta < -1.1)
            nb_frames = 0;
        else if (delta > 1.1)
            nb_frames = lrintf(delta);
        break;
    case VSYNC_VFR:
        if (delta <= -0.6)
            nb_frames = 0;
        else if (delta > 0.6)
            ost->sync_opts = lrintf(sync_ipts);
        break;
    case VSYNC_DROP:
    case VSYNC_PASSTHROUGH:
        ost->sync_opts = lrintf(sync_ipts);
        break;
    default:
        av_assert0(0);
    }

    nb_frames = FFMIN(nb_frames, ost->max_frames - ost->frame_number);
    if (nb_frames == 0) {
        nb_frames_drop++;
        av_log(NULL, AV_LOG_VERBOSE, "*** drop!\n");
        return;
    } else if (nb_frames > 1) {
        nb_frames_dup += nb_frames - 1;
        av_log(NULL, AV_LOG_VERBOSE, "*** %d dup!\n", nb_frames - 1);
    }

    /* duplicates frame if needed */
    for (i = 0; i < nb_frames; i++) {
        AVPacket pkt;
        av_init_packet(&pkt);
        pkt.data = NULL;
        pkt.size = 0;

        if (s->oformat->flags & AVFMT_RAWPICTURE &&
            enc->codec->id == CODEC_ID_RAWVIDEO) {
            /* raw pictures are written as AVPicture structure to
               avoid any copies. We support temporarily the older
               method. */
            enc->coded_frame->interlaced_frame = in_picture->interlaced_frame;
            enc->coded_frame->top_field_first  = in_picture->top_field_first;
            pkt.data   = (uint8_t *)in_picture;
            pkt.size   =  sizeof(AVPicture);
            pkt.pts    = av_rescale_q(ost->sync_opts, enc->time_base, ost->st->time_base);
            pkt.flags |= AV_PKT_FLAG_KEY;

            write_frame(s, &pkt, ost);
        } else {
            int got_packet;
            AVFrame big_picture;

            big_picture = *in_picture;
            /* better than nothing: use input picture interlaced
               settings */
            big_picture.interlaced_frame = in_picture->interlaced_frame;
            if (ost->st->codec->flags & (CODEC_FLAG_INTERLACED_DCT|CODEC_FLAG_INTERLACED_ME)) {
                if (ost->top_field_first == -1)
                    big_picture.top_field_first = in_picture->top_field_first;
                else
                    big_picture.top_field_first = !!ost->top_field_first;
            }