ffmpeg.c

    /* see if audio/video inputs are needed */
    has_video = 0;
    has_audio = 0;
    memset(ap, 0, sizeof(*ap));
    for(j=0;j<nb_output_files;j++) {
        oc = output_files[j];
        for(i=0;i<oc->nb_streams;i++) {
            AVCodecContext *enc = &oc->streams[i]->codec;
            switch(enc->codec_type) {
            case CODEC_TYPE_AUDIO:
                if (enc->sample_rate > ap->sample_rate)
                    ap->sample_rate = enc->sample_rate;
                if (enc->channels > ap->channels)
                    ap->channels = enc->channels;
                has_audio = 1;
                break;
            case CODEC_TYPE_VIDEO:
                if (enc->width > ap->width)
                    ap->width = enc->width;
                if (enc->height > ap->height)
                    ap->height = enc->height;
                if (enc->frame_rate > ap->frame_rate)
                    ap->frame_rate = enc->frame_rate;
                has_video = 1;
                break;
            default:
                av_abort();
            }
        }
    }
    
    if (has_video == 0 && has_audio == 0) {
        fprintf(stderr, "Output file must have at least one audio or video stream\n");
        exit(1);
    }
    
    if (has_video) {
        AVInputFormat *fmt1;
        fmt1 = av_find_input_format("video_grab_device");
        if (av_open_input_file(&ic, "", fmt1, 0, ap) < 0) {
            fprintf(stderr, "Could not find video grab device\n");
            exit(1);
        }
        /* by now video grab has one stream */
        ic->streams[0]->r_frame_rate = ap->frame_rate;
        input_files[nb_input_files] = ic;
        dump_format(ic, nb_input_files, v4l_device, 0);
        nb_input_files++;
    }
    if (has_audio) {
        AVInputFormat *fmt1;
        fmt1 = av_find_input_format("audio_device");
        if (av_open_input_file(&ic, "", fmt1, 0, ap) < 0) {
            fprintf(stderr, "Could not find audio grab device\n");
            exit(1);
        }
        input_files[nb_input_files] = ic;
        dump_format(ic, nb_input_files, audio_device, 0);
        nb_input_files++;
    }
}

/* open the necessary output devices for playing */
void prepare_play(void)
{
    file_iformat = NULL;
    file_oformat = guess_format("audio_device", NULL, NULL);
    if (!file_oformat) {
        fprintf(stderr, "Could not find audio device\n");
        exit(1);
    }
    
    opt_output_file(audio_device);
}


#ifndef CONFIG_WIN32
INT64 getutime(void)
{
    struct rusage rusage;

    getrusage(RUSAGE_SELF, &rusage);
    return (rusage.ru_utime.tv_sec * 1000000LL) + rusage.ru_utime.tv_usec;
}
#else
INT64 getutime(void)
{
  return av_gettime();
}
#endif

extern int ffm_nopts;

void opt_bitexact(void)
{
    avcodec_set_bit_exact();
    /* disable generate of real time pts in ffm (need to be supressed anyway) */
    ffm_nopts = 1;
}

void show_formats(void)
{
    AVInputFormat *ifmt;
    AVOutputFormat *ofmt;
    URLProtocol *up;
    AVCodec *p;
    const char **pp;

    printf("File formats:\n");
    printf("  Encoding:");
    for(ofmt = first_oformat; ofmt != NULL; ofmt = ofmt->next) {
        printf(" %s", ofmt->name);
    }
    printf("\n");
    printf("  Decoding:");
    for(ifmt = first_iformat; ifmt != NULL; ifmt = ifmt->next) {
        printf(" %s", ifmt->name);
    }
    printf("\n");

    printf("Codecs:\n");
    printf("  Encoders:");
    for(p = first_avcodec; p != NULL; p = p->next) {
        if (p->encode)
            printf(" %s", p->name);
    }
    printf("\n");

    printf("  Decoders:");
    for(p = first_avcodec; p != NULL; p = p->next) {
        if (p->decode)
            printf(" %s", p->name);
    }
    printf("\n");

    printf("Supported file protocols:");
    for(up = first_protocol; up != NULL; up = up->next)
        printf(" %s:", up->name);
    printf("\n");
    
    printf("Frame size abbreviations: sqcif qcif cif 4cif\n");
    printf("Motion estimation methods:");
    pp = motion_str;
    while (*pp) {
        printf(" %s", *pp);
        if ((pp - motion_str + 1) == ME_ZERO) 
            printf("(fastest)");
        else if ((pp - motion_str + 1) == ME_FULL) 
            printf("(slowest)");
        else if ((pp - motion_str + 1) == ME_EPZS) 
            printf("(default)");
        pp++;
    }
    printf("\n");
    exit(1);
}

void show_help(void)
{
    const char *prog;
    const OptionDef *po;
    int i, expert;
    
    prog = do_play ? "ffplay" : "ffmpeg";

    printf("%s version " FFMPEG_VERSION ", Copyright (c) 2000, 2001, 2002 Fabrice Bellard\n",
           prog);
    
    if (!do_play) {
        printf("usage: ffmpeg [[options] -i input_file]... {[options] outfile}...\n"
               "Hyper fast MPEG1/MPEG4/H263/RV and AC3/MPEG audio encoder\n");
    } else {
        printf("usage: ffplay [options] input_file...\n"
               "Simple audio player\n");
    }
           
    printf("\n"
           "Main options are:\n");
    for(i=0;i<2;i++) {
        if (i == 1)
            printf("\nAdvanced options are:\n");
        for(po = options; po->name != NULL; po++) {
            char buf[64];
            expert = (po->flags & OPT_EXPERT) != 0;
            if (expert == i) {
                strcpy(buf, po->name);
                if (po->flags & HAS_ARG) {
                    strcat(buf, " ");
                    strcat(buf, po->argname);
                }
                printf("-%-17s  %s\n", buf, po->help);
            }
        }
    }

    exit(1);
}

const OptionDef options[] = {
    { "L", 0, {(void*)show_licence}, "show license" },
    { "h", 0, {(void*)show_help}, "show help" },
    { "formats", 0, {(void*)show_formats}, "show available formats, codecs, protocols, ..." },
    { "f", HAS_ARG, {(void*)opt_format}, "force format", "fmt" },
    { "vcd", OPT_BOOL, {(void*)&mpeg_vcd}, "output Video CD MPEG-PS compliant file" },
    { "i", HAS_ARG, {(void*)opt_input_file}, "input file name", "filename" },
    { "y", OPT_BOOL, {(void*)&file_overwrite}, "overwrite output files" },
    { "map", HAS_ARG | OPT_EXPERT, {(void*)opt_map}, "set input stream mapping", "file:stream" },
    { "t", HAS_ARG, {(void*)opt_recording_time}, "set the recording time", "duration" },
    { "title", HAS_ARG | OPT_STRING, {(void*)&str_title}, "set the title", "string" },
    { "author", HAS_ARG | OPT_STRING, {(void*)&str_author}, "set the author", "string" },
    { "copyright", HAS_ARG | OPT_STRING, {(void*)&str_copyright}, "set the copyright", "string" },
    { "comment", HAS_ARG | OPT_STRING, {(void*)&str_comment}, "set the comment", "string" },
    /* video options */
    { "b", HAS_ARG, {(void*)opt_video_bitrate}, "set video bitrate (in kbit/s)", "bitrate" },
    { "r", HAS_ARG, {(void*)opt_frame_rate}, "set frame rate (in Hz)", "rate" },
    { "s", HAS_ARG, {(void*)opt_frame_size}, "set frame size (WxH or abbreviation)", "size" },
    { "croptop", HAS_ARG, {(void*)opt_frame_crop_top}, "set top crop band size (in pixels)", "size" },
    { "cropbottom", HAS_ARG, {(void*)opt_frame_crop_bottom}, "set bottom crop band size (in pixels)", "size" },
    { "cropleft", HAS_ARG, {(void*)opt_frame_crop_left}, "set left crop band size (in pixels)", "size" },
    { "cropright", HAS_ARG, {(void*)opt_frame_crop_right}, "set right crop band size (in pixels)", "size" },
    { "g", HAS_ARG | OPT_EXPERT, {(void*)opt_gop_size}, "set the group of picture size", "gop_size" },
    { "intra", OPT_BOOL | OPT_EXPERT, {(void*)&intra_only}, "use only intra frames"},
    { "vn", OPT_BOOL, {(void*)&video_disable}, "disable video" },
    { "qscale", HAS_ARG | OPT_EXPERT, {(void*)opt_qscale}, "use fixed video quantiser scale (VBR)", "q" },
    { "qmin", HAS_ARG | OPT_EXPERT, {(void*)opt_qmin}, "min video quantiser scale (VBR)", "q" },
    { "qmax", HAS_ARG | OPT_EXPERT, {(void*)opt_qmax}, "max video quantiser scale (VBR)", "q" },
    { "qdiff", HAS_ARG | OPT_EXPERT, {(void*)opt_qdiff}, "max difference between the quantiser scale (VBR)", "q" },
    { "qblur", HAS_ARG | OPT_EXPERT, {(void*)opt_qblur}, "video quantiser scale blur (VBR)", "blur" },
    { "qcomp", HAS_ARG | OPT_EXPERT, {(void*)opt_qcomp}, "video quantiser scale compression (VBR)", "compression" },
    { "rc_eq", HAS_ARG | OPT_EXPERT, {(void*)opt_video_rc_eq}, "", "equation" },
    { "bt", HAS_ARG, {(void*)opt_video_bitrate_tolerance}, "set video bitrate tolerance (in kbit/s)", "tolerance" },
    { "maxrate", HAS_ARG, {(void*)opt_video_bitrate_max}, "set max video bitrate tolerance (in kbit/s)", "bitrate" },
    { "minrate", HAS_ARG, {(void*)opt_video_bitrate_min}, "set min video bitrate tolerance (in kbit/s)", "bitrate" },
    { "vd", HAS_ARG | OPT_EXPERT, {(void*)opt_video_device}, "set video grab device", "device" },
    { "vcodec", HAS_ARG | OPT_EXPERT, {(void*)opt_video_codec}, "force video codec", "codec" },
    { "me", HAS_ARG | OPT_EXPERT, {(void*)opt_motion_estimation}, "set motion estimation method", 
      "method" },
    { "dct_algo", HAS_ARG | OPT_EXPERT, {(void*)opt_dct_algo}, "set dct algo",  "algo" },
    { "bf", HAS_ARG | OPT_EXPERT, {(void*)opt_b_frames}, "use 'frames' B frames (only MPEG-4)", "frames" },
    { "hq", OPT_BOOL | OPT_EXPERT, {(void*)&use_hq}, "activate high quality settings" },
    { "4mv", OPT_BOOL | OPT_EXPERT, {(void*)&use_4mv}, "use four motion vector by macroblock (only MPEG-4)" },
    { "bug", HAS_ARG | OPT_EXPERT, {(void*)opt_workaround_bugs}, "workaround not auto detected encoder bugs", "param" },
    { "sameq", OPT_BOOL, {(void*)&same_quality}, 
      "use same video quality as source (implies VBR)" },
    /* audio options */
    { "ab", HAS_ARG, {(void*)opt_audio_bitrate}, "set audio bitrate (in kbit/s)", "bitrate", },
    { "ar", HAS_ARG, {(void*)opt_audio_rate}, "set audio sampling rate (in Hz)", "rate" },
    { "ac", HAS_ARG, {(void*)opt_audio_channels}, "set number of audio channels", "channels" },
    { "an", OPT_BOOL, {(void*)&audio_disable}, "disable audio" },
    { "ad", HAS_ARG | OPT_EXPERT, {(void*)opt_audio_device}, "set audio device", "device" },
    { "acodec", HAS_ARG | OPT_EXPERT, {(void*)opt_audio_codec}, "force audio codec", "codec" },
    { "deinterlace", OPT_BOOL | OPT_EXPERT, {(void*)&do_deinterlace}, 
      "deinterlace pictures" },
    { "benchmark", OPT_BOOL | OPT_EXPERT, {(void*)&do_benchmark}, 
      "add timings for benchmarking" },
    { "hex", OPT_BOOL | OPT_EXPERT, {(void*)&do_hex_dump}, 
      "dump each input packet" },
    { "psnr", OPT_BOOL | OPT_EXPERT, {(void*)&do_psnr}, "calculate PSNR of compressed frames" },
    { "vstats", OPT_BOOL | OPT_EXPERT, {(void*)&do_vstats}, "dump video coding statistics to file" }, 
    { "bitexact", OPT_EXPERT, {(void*)opt_bitexact}, "only use bit exact algorithms (for codec testing)" }, 
    { NULL, },
};

int main(int argc, char **argv)
{
    int optindex, i;
    const char *opt, *arg;
    const OptionDef *po;
    INT64 ti;
    
    av_register_all();

    /* detect if invoked as player */
    i = strlen(argv[0]);
    if (i >= 6 && !strcmp(argv[0] + i - 6, "ffplay"))
        do_play = 1;

    if (argc <= 1)
        show_help();
    
    /* parse options */
    optindex = 1;
    while (optindex < argc) {
        opt = argv[optindex++];
        
        if (opt[0] == '-' && opt[1] != '\0') {
            po = options;
            while (po->name != NULL) {
                if (!strcmp(opt + 1, po->name))
                    break;
                po++;
            }
            if (!po->name) {
                fprintf(stderr, "%s: unrecognized option '%s'\n", argv[0], opt);
                exit(1);
            }
            arg = NULL;
            if (po->flags & HAS_ARG)
                arg = argv[optindex++];
            if (po->flags & OPT_STRING) {
                char *str;
                str = strdup(arg);
                *po->u.str_arg = str;
            } else if (po->flags & OPT_BOOL) {
                *po->u.int_arg = 1;
            } else {
                po->u.func_arg(arg);
            }
        } else {
            if (!do_play) {
                opt_output_file(opt);
            } else {
                opt_input_file(opt);
            }
        }
    }


    if (!do_play) {
        /* file converter / grab */
        if (nb_output_files <= 0) {
            fprintf(stderr, "Must supply at least one output file\n");
            exit(1);
        }
        
        if (nb_input_files == 0) {
            prepare_grab();
        }
    } else {
        /* player */
        if (nb_input_files <= 0) {
            fprintf(stderr, "Must supply at least one input file\n");
            exit(1);
        }
        prepare_play();
    }

    ti = getutime();
    av_encode(output_files, nb_output_files, input_files, nb_input_files, 
              stream_maps, nb_stream_maps);
    ti = getutime() - ti;
    if (do_benchmark) {
        printf("bench: utime=%0.3fs\n", ti / 1000000.0);
    }

    /* close files */
    for(i=0;i<nb_output_files;i++) {
        if (!(output_files[i]->oformat->flags & AVFMT_NOFILE)) 
            url_fclose(&output_files[i]->pb);
    }
    for(i=0;i<nb_input_files;i++)
        av_close_input_file(input_files[i]);

    return 0;
}