/*
 * FFprobe : Simple Media Prober based on the FFmpeg libraries
 * Copyright (c) 2007-2010 Stefano Sabatini
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "config.h"

#include "libavformat/avformat.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/opt.h"
#include "libavutil/pixdesc.h"
#include "libavdevice/avdevice.h"
#include "cmdutils.h"

const char program_name[] = "FFprobe";
const int program_birth_year = 2007;

static int do_show_format  = 0;
static int do_show_streams = 0;

static int convert_tags                 = 0;
static int show_value_unit              = 0;
static int use_value_prefix             = 0;
static int use_byte_value_binary_prefix = 0;
static int use_value_sexagesimal_format = 0;

/* globals */
static const OptionDef options[];

/* FFprobe context */
static const char *input_filename;
static AVInputFormat *iformat = NULL;

static const char *binary_unit_prefixes [] = { "", "Ki", "Mi", "Gi", "Ti", "Pi" };
static const char *decimal_unit_prefixes[] = { "", "K" , "M" , "G" , "T" , "P"  };

static const char *unit_second_str          = "s"    ;
static const char *unit_hertz_str           = "Hz"   ;
static const char *unit_byte_str            = "byte" ;
static const char *unit_bit_per_second_str  = "bit/s";

static char *value_string(char *buf, int buf_size, double val, const char *unit)
{
    if (unit == unit_second_str && use_value_sexagesimal_format) {
        double secs;
        int hours, mins;
        secs  = val;
        mins  = (int)secs / 60;
        secs  = secs - mins * 60;
        hours = mins / 60;
        mins %= 60;
        snprintf(buf, buf_size, "%d:%02d:%09.6f", hours, mins, secs);
    } else if (use_value_prefix) {
        const char *prefix_string;
        int index;

        if (unit == unit_byte_str && use_byte_value_binary_prefix) {
            index = (int) (log(val)/log(2)) / 10;
            index = av_clip(index, 0, FF_ARRAY_ELEMS(binary_unit_prefixes) -1);
            val /= pow(2, index*10);
            prefix_string = binary_unit_prefixes[index];
        } else {
            index = (int) (log10(val)) / 3;
            index = av_clip(index, 0, FF_ARRAY_ELEMS(decimal_unit_prefixes) -1);
            val /= pow(10, index*3);
            prefix_string = decimal_unit_prefixes[index];
        }

        snprintf(buf, buf_size, "%.3f %s%s", val, prefix_string, show_value_unit ? unit : "");
    } else {
        snprintf(buf, buf_size, "%f %s", val, show_value_unit ? unit : "");
    }

    return buf;
}

static char *time_value_string(char *buf, int buf_size, int64_t val, const AVRational *time_base)
{
    if (val == AV_NOPTS_VALUE) {
        snprintf(buf, buf_size, "N/A");
    } else {
        value_string(buf, buf_size, val * av_q2d(*time_base), unit_second_str);
    }

    return buf;
}

static const char *media_type_string(enum AVMediaType media_type)
{
    switch (media_type) {
    case AVMEDIA_TYPE_VIDEO:      return "video";
    case AVMEDIA_TYPE_AUDIO:      return "audio";
    case AVMEDIA_TYPE_DATA:       return "data";
    case AVMEDIA_TYPE_SUBTITLE:   return "subtitle";
    case AVMEDIA_TYPE_ATTACHMENT: return "attachment";
    default:                      return "unknown";
    }
}

static void show_stream(AVFormatContext *fmt_ctx, int stream_idx)
{
    AVStream *stream = fmt_ctx->streams[stream_idx];
    AVCodecContext *dec_ctx;
    AVCodec *dec;
    char val_str[128];
    AVMetadataTag *tag = NULL;
    AVRational display_aspect_ratio;

    printf("[STREAM]\n");

    printf("index=%d\n",        stream->index);

    if ((dec_ctx = stream->codec)) {
        if ((dec = dec_ctx->codec)) {
            printf("codec_name=%s\n",         dec->name);
            printf("codec_long_name=%s\n",    dec->long_name);
        } else {
            printf("codec_name=unknown\n");
        }

        printf("codec_type=%s\n",         media_type_string(dec_ctx->codec_type));
        printf("codec_time_base=%d/%d\n", dec_ctx->time_base.num, dec_ctx->time_base.den);

        /* print AVI/FourCC tag */
        av_get_codec_tag_string(val_str, sizeof(val_str), dec_ctx->codec_tag);
        printf("codec_tag_string=%s\n", val_str);
        printf("codec_tag=0x%04x\n", dec_ctx->codec_tag);

        switch (dec_ctx->codec_type) {
        case AVMEDIA_TYPE_VIDEO:
            printf("width=%d\n",                   dec_ctx->width);
            printf("height=%d\n",                  dec_ctx->height);
            printf("has_b_frames=%d\n",            dec_ctx->has_b_frames);
            if (dec_ctx->sample_aspect_ratio.num) {
                printf("sample_aspect_ratio=%d:%d\n", dec_ctx->sample_aspect_ratio.num,
                                                      dec_ctx->sample_aspect_ratio.den);
                av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
                          dec_ctx->width  * dec_ctx->sample_aspect_ratio.num,
                          dec_ctx->height * dec_ctx->sample_aspect_ratio.den,
                          1024*1024);
                printf("display_aspect_ratio=%d:%d\n", display_aspect_ratio.num,
                                                       display_aspect_ratio.den);
            }
            printf("pix_fmt=%s\n",                 dec_ctx->pix_fmt != PIX_FMT_NONE ?
                   av_pix_fmt_descriptors[dec_ctx->pix_fmt].name : "unknown");
            break;

        case AVMEDIA_TYPE_AUDIO:
            printf("sample_rate=%s\n",             value_string(val_str, sizeof(val_str),
                                                                dec_ctx->sample_rate,
                                                                unit_hertz_str));
            printf("channels=%d\n",                dec_ctx->channels);
            printf("bits_per_sample=%d\n",         av_get_bits_per_sample(dec_ctx->codec_id));
            break;
        }
    } else {
        printf("codec_type=unknown\n");
    }

    if (fmt_ctx->iformat->flags & AVFMT_SHOW_IDS)
        printf("id=0x%x\n", stream->id);
    printf("r_frame_rate=%d/%d\n",         stream->r_frame_rate.num,   stream->r_frame_rate.den);
    printf("avg_frame_rate=%d/%d\n",       stream->avg_frame_rate.num, stream->avg_frame_rate.den);
    printf("time_base=%d/%d\n",            stream->time_base.num,      stream->time_base.den);
    if (stream->language[0])
        printf("language=%s\n",            stream->language);
    printf("start_time=%s\n",   time_value_string(val_str, sizeof(val_str), stream->start_time,
                                                  &stream->time_base));
    printf("duration=%s\n",     time_value_string(val_str, sizeof(val_str), stream->duration,
                                                  &stream->time_base));
    if (stream->nb_frames)
        printf("nb_frames=%"PRId64"\n",    stream->nb_frames);

    while ((tag = av_metadata_get(stream->metadata, "", tag, AV_METADATA_IGNORE_SUFFIX)))
        printf("TAG:%s=%s\n", tag->key, tag->value);

    printf("[/STREAM]\n");
}

static void show_format(AVFormatContext *fmt_ctx)
{
    AVMetadataTag *tag = NULL;
    char val_str[128];

    printf("[FORMAT]\n");

    printf("filename=%s\n",         fmt_ctx->filename);
    printf("nb_streams=%d\n",       fmt_ctx->nb_streams);
    printf("format_name=%s\n",      fmt_ctx->iformat->name);
    printf("format_long_name=%s\n", fmt_ctx->iformat->long_name);
    printf("start_time=%s\n",       time_value_string(val_str, sizeof(val_str), fmt_ctx->start_time,
                                                      &AV_TIME_BASE_Q));
    printf("duration=%s\n",         time_value_string(val_str, sizeof(val_str), fmt_ctx->duration,
                                                      &AV_TIME_BASE_Q));
    printf("size=%s\n",             value_string(val_str, sizeof(val_str), fmt_ctx->file_size,
                                                 unit_byte_str));
    printf("bit_rate=%s\n",         value_string(val_str, sizeof(val_str), fmt_ctx->bit_rate,
                                                 unit_bit_per_second_str));

    if (convert_tags)
        av_metadata_conv(fmt_ctx, NULL, fmt_ctx->iformat->metadata_conv);
    while ((tag = av_metadata_get(fmt_ctx->metadata, "", tag, AV_METADATA_IGNORE_SUFFIX)))
        printf("TAG:%s=%s\n", tag->key, tag->value);

    printf("[/FORMAT]\n");
}

static int open_input_file(AVFormatContext **fmt_ctx_ptr, const char *filename)
{
    int err, i;
    AVFormatContext *fmt_ctx;

    fmt_ctx = avformat_alloc_context();

    if ((err = av_open_input_file(&fmt_ctx, filename, iformat, 0, NULL)) < 0) {
        print_error(filename, err);
        return err;
    }

    /* fill the streams in the format context */
    if ((err = av_find_stream_info(fmt_ctx)) < 0) {
        print_error(filename, err);
        return err;
    }

    dump_format(fmt_ctx, 0, filename, 0);

    /* bind a decoder to each input stream */
    for (i = 0; i < fmt_ctx->nb_streams; i++) {
        AVStream *stream = fmt_ctx->streams[i];
        AVCodec *codec;

        if (!(codec = avcodec_find_decoder(stream->codec->codec_id))) {
            fprintf(stderr, "Unsupported codec (id=%d) for input stream %d\n",
                    stream->codec->codec_id, stream->index);
        } else if (avcodec_open(stream->codec, codec) < 0) {
            fprintf(stderr, "Error while opening codec for input stream %d\n",
                    stream->index);
        }
    }

    *fmt_ctx_ptr = fmt_ctx;
    return 0;
}

static int probe_file(const char *filename)
{
    AVFormatContext *fmt_ctx;
    int ret, i;

    if ((ret = open_input_file(&fmt_ctx, filename)))
        return ret;

    if (do_show_streams)
        for (i = 0; i < fmt_ctx->nb_streams; i++)
            show_stream(fmt_ctx, i);

    if (do_show_format)
        show_format(fmt_ctx);

    av_close_input_file(fmt_ctx);
    return 0;
}

static void show_usage(void)
{
    printf("Simple multimedia streams analyzer\n");
    printf("usage: ffprobe [OPTIONS] [INPUT_FILE]\n");
    printf("\n");
}

static void opt_format(const char *arg)
{
    iformat = av_find_input_format(arg);
    if (!iformat) {
        fprintf(stderr, "Unknown input format: %s\n", arg);
        exit(1);
    }
}

static void opt_input_file(const char *arg)
{
    if (input_filename) {
        fprintf(stderr, "Argument '%s' provided as input filename, but '%s' was already specified.\n",
                arg, input_filename);
        exit(1);
    }
    if (!strcmp(arg, "-"))
        arg = "pipe:";
    input_filename = arg;
}

static void show_help(void)
{
    show_usage();
    show_help_options(options, "Main options:\n", 0, 0);
    printf("\n");
}

static void opt_pretty(void)
{
    show_value_unit              = 1;
    use_value_prefix             = 1;
    use_byte_value_binary_prefix = 1;
    use_value_sexagesimal_format = 1;
}

static const OptionDef options[] = {
#include "cmdutils_common_opts.h"
    { "convert_tags", OPT_BOOL, {(void*)&convert_tags}, "convert tag names to the FFmpeg generic tag names" },
    { "f", HAS_ARG, {(void*)opt_format}, "force format", "format" },
    { "unit", OPT_BOOL, {(void*)&show_value_unit}, "show unit of the displayed values" },
    { "prefix", OPT_BOOL, {(void*)&use_value_prefix}, "use SI prefixes for the displayed values" },
    { "byte_binary_prefix", OPT_BOOL, {(void*)&use_byte_value_binary_prefix},
      "use binary prefixes for byte units" },
    { "sexagesimal", OPT_BOOL,  {(void*)&use_value_sexagesimal_format},
      "use sexagesimal format HOURS:MM:SS.MICROSECONDS for time units" },
    { "pretty", 0, {(void*)&opt_pretty},
      "prettify the format of displayed values, make it more human readable" },
    { "show_format",  OPT_BOOL, {(void*)&do_show_format} , "show format/container info" },
    { "show_streams", OPT_BOOL, {(void*)&do_show_streams}, "show streams info" },
    { NULL, },
};

int main(int argc, char **argv)
{
    av_register_all();
#if CONFIG_AVDEVICE
    avdevice_register_all();
#endif

    show_banner();
    parse_options(argc, argv, options, opt_input_file);

    if (!input_filename) {
        show_usage();
        fprintf(stderr, "You have to specify one input file.\n");
        fprintf(stderr, "Use -h to get full help or, even better, run 'man ffprobe'.\n");
        exit(1);
    }

    return probe_file(input_filename);
}
