ffmpeg.c

        }
    
        if (use_audio) {
            AVCodecContext *audio_enc;

            st = av_mallocz(sizeof(AVStream));
            if (!st) {
                fprintf(stderr, "Could not alloc stream\n");
                exit(1);
            }
            audio_enc = &st->codec;
            codec_id = file_format->audio_codec;
            if (audio_codec_id != CODEC_ID_NONE)
                codec_id = audio_codec_id;
            audio_enc->codec_id = codec_id;
            audio_enc->codec_type = CODEC_TYPE_AUDIO;
            
            audio_enc->bit_rate = audio_bit_rate;
            audio_enc->sample_rate = audio_sample_rate;
            audio_enc->channels = audio_channels;
            oc->streams[nb_streams] = st;
            nb_streams++;
        }

        oc->nb_streams = nb_streams;

        if (!nb_streams) {
            fprintf(stderr, "No audio or video streams available\n");
            exit(1);
        }

        if (str_title)
            nstrcpy(oc->title, sizeof(oc->title), str_title);
        if (str_author)
            nstrcpy(oc->author, sizeof(oc->author), str_author);
        if (str_copyright)
            nstrcpy(oc->copyright, sizeof(oc->copyright), str_copyright);
        if (str_comment)
            nstrcpy(oc->comment, sizeof(oc->comment), str_comment);
    }

    output_files[nb_output_files] = oc;
    /* dump the file content */
    dump_format(oc, nb_output_files, filename, 1);
    nb_output_files++;

    strcpy(oc->filename, filename);

    /* check filename in case of an image number is expected */
    if (oc->format->flags & AVFMT_NEEDNUMBER) {
        if (filename_number_test(oc->filename) < 0)
            exit(1);
    }

    if (!(oc->format->flags & AVFMT_NOFILE)) {
        /* test if it already exists to avoid loosing precious files */
        if (!file_overwrite && 
            (strchr(filename, ':') == NULL ||
             strstart(filename, "file:", NULL))) {
            if (url_exist(filename)) {
                int c;
                
                printf("File '%s' already exists. Overwrite ? [y/N] ", filename);
                fflush(stdout);
                c = getchar();
                if (toupper(c) != 'Y') {
                    fprintf(stderr, "Not overwriting - exiting\n");
                    exit(1);
                }
            }
        }
        
        /* open the file */
        if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
            fprintf(stderr, "Could not open '%s'\n", filename);
            exit(1);
        }
    }

    /* reset some options */
    file_format = NULL;
    audio_disable = 0;
    video_disable = 0;
    audio_codec_id = CODEC_ID_NONE;
    video_codec_id = CODEC_ID_NONE;
}

#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 gettime();
}
#endif

void show_formats(void)
{
    AVFormat *f;
    URLProtocol *up;
    AVCodec *p;
    const char **pp;

    printf("File formats:\n");
    printf("  Encoding:");
    for(f = first_format; f != NULL; f = f->next) {
        if (f->write_header)
            printf(" %s", f->name);
    }
    printf("\n");
    printf("  Decoding:");
    for(f = first_format; f != NULL; f = f->next) {
        if (f->read_header)
            printf(" %s", f->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) == ME_ZERO) 
            printf("(fastest)");
        else if ((pp - motion_str) == ME_FULL) 
            printf("(slowest)");
        else if ((pp - motion_str) == ME_LOG) 
            printf("(default)");
        pp++;
    }
    printf("\n");
    exit(1);
}

void show_help(void)
{
    const OptionDef *po;
    int i, expert;

    printf("ffmpeg version " FFMPEG_VERSION ", Copyright (c) 2000,2001 Gerard Lantau\n"
           "usage: ffmpeg [[options] -i input_file]... {[options] outfile}...\n"
           "Hyper fast MPEG1/MPEG4/H263/RV and AC3/MPEG audio encoder\n"
           "\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" },
    { "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" },
    { "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" },
#ifdef CONFIG_GRAB
    { "vd", HAS_ARG | OPT_EXPERT, {(void*)opt_video_device}, "set video device", "device" },
#endif
    { "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" },
    { "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" },
#ifdef CONFIG_GRAB
    { "ad", HAS_ARG | OPT_EXPERT, {(void*)opt_audio_device}, "set audio device", "device" },
#endif
    { "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" },

    { NULL, },
};

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

    if (argc <= 1)
        show_help();

    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 {
            opt_output_file(opt);
        }
    }


    if (nb_input_files == 0) {
#ifdef CONFIG_GRAB
        if (nb_output_files != 1) {
            fprintf(stderr, "Only one output file supported when grabbing\n");
            exit(1);
        }
        av_grab(output_files[0]);
#else
        fprintf(stderr, "Must supply at least one input file\n");
#endif
    } else {
        INT64 ti;

        if (nb_output_files <= 0) {
            fprintf(stderr, "Must supply at least one output file\n");
            exit(1);
        }
        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]->format->flags & AVFMT_NOFILE)) 
            url_fclose(&output_files[i]->pb);
    }
    for(i=0;i<nb_input_files;i++) {
        if (!(input_files[i]->format->flags & AVFMT_NOFILE)) 
            url_fclose(&input_files[i]->pb);
    }

    return 0;
}