//  [c]
static int show_stream(WriterContext *w, AVFormatContext *fmt_ctx, int stream_idx, InputStream *ist, int in_program)
{
    AVStream *stream = ist->st;
    AVCodecParameters *par;
    AVCodecContext *dec_ctx;
    char val_str[128];
    const char *s;
    AVRational sar, dar;
    AVBPrint pbuf;
    const AVCodecDescriptor *cd;
    int ret = 0;
    const char *profile = NULL;

    av_bprint_init(&pbuf, 1, AV_BPRINT_SIZE_UNLIMITED);

    writer_print_section_header(w, in_program ? SECTION_ID_PROGRAM_STREAM : SECTION_ID_STREAM);

    print_int("index", stream->index);

    par     = stream->codecpar;
    dec_ctx = ist->dec_ctx;
    if (cd = avcodec_descriptor_get(par->codec_id)) {
        print_str("codec_name", cd->name);
        if (!do_bitexact) {
            print_str("codec_long_name",
                      cd->long_name ? cd->long_name : "unknown");
        }
    } else {
        print_str_opt("codec_name", "unknown");
        if (!do_bitexact) {
            print_str_opt("codec_long_name", "unknown");
        }
    }

    if (!do_bitexact && (profile = avcodec_profile_name(par->codec_id, par->profile)))
        print_str("profile", profile);
    else {
        if (par->profile != FF_PROFILE_UNKNOWN) {
            char profile_num[12];
            snprintf(profile_num, sizeof(profile_num), "%d", par->profile);
            print_str("profile", profile_num);
        } else
            print_str_opt("profile", "unknown");
    }

    s = av_get_media_type_string(par->codec_type);
    if (s) print_str    ("codec_type", s);
    else   print_str_opt("codec_type", "unknown");
#if FF_API_LAVF_AVCTX
    if (dec_ctx)
        print_q("codec_time_base", dec_ctx->time_base, '/');
#endif

    /* print AVI/FourCC tag */
    print_str("codec_tag_string",    av_fourcc2str(par->codec_tag));
    print_fmt("codec_tag", "0x%04"PRIx32, par->codec_tag);

    switch (par->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
        print_int("width",        par->width);
        print_int("height",       par->height);
        if (dec_ctx) {
            print_int("coded_width",  dec_ctx->coded_width);
            print_int("coded_height", dec_ctx->coded_height);
        }
        print_int("has_b_frames", par->video_delay);
        sar = av_guess_sample_aspect_ratio(fmt_ctx, stream, NULL);
        if (sar.den) {
            print_q("sample_aspect_ratio", sar, ':');
            av_reduce(&dar.num, &dar.den,
                      par->width  * sar.num,
                      par->height * sar.den,
                      1024*1024);
            print_q("display_aspect_ratio", dar, ':');
        } else {
            print_str_opt("sample_aspect_ratio", "N/A");
            print_str_opt("display_aspect_ratio", "N/A");
        }
        s = av_get_pix_fmt_name(par->format);
        if (s) print_str    ("pix_fmt", s);
        else   print_str_opt("pix_fmt", "unknown");
        print_int("level",   par->level);
        if (par->color_range != AVCOL_RANGE_UNSPECIFIED)
            print_str    ("color_range", av_color_range_name(par->color_range));
        else
            print_str_opt("color_range", "N/A");

        if (par->color_space != AVCOL_SPC_UNSPECIFIED)
            print_str("color_space", av_color_space_name(par->color_space));
        else
            print_str_opt("color_space", av_color_space_name(par->color_space));

        if (par->color_trc != AVCOL_TRC_UNSPECIFIED)
            print_str("color_transfer", av_color_transfer_name(par->color_trc));
        else
            print_str_opt("color_transfer", av_color_transfer_name(par->color_trc));

        print_primaries(w, par->color_primaries);

        if (par->chroma_location != AVCHROMA_LOC_UNSPECIFIED)
            print_str("chroma_location", av_chroma_location_name(par->chroma_location));
        else
            print_str_opt("chroma_location", av_chroma_location_name(par->chroma_location));

        if (par->field_order == AV_FIELD_PROGRESSIVE)
            print_str("field_order", "progressive");
        else if (par->field_order == AV_FIELD_TT)
            print_str("field_order", "tt");
        else if (par->field_order == AV_FIELD_BB)
            print_str("field_order", "bb");
        else if (par->field_order == AV_FIELD_TB)
            print_str("field_order", "tb");
        else if (par->field_order == AV_FIELD_BT)
            print_str("field_order", "bt");
        else
            print_str_opt("field_order", "unknown");

#if FF_API_PRIVATE_OPT
        if (dec_ctx && dec_ctx->timecode_frame_start >= 0) {
            char tcbuf[AV_TIMECODE_STR_SIZE];
            av_timecode_make_mpeg_tc_string(tcbuf, dec_ctx->timecode_frame_start);
            print_str("timecode", tcbuf);
        } else {
            print_str_opt("timecode", "N/A");
        }
#endif
        if (dec_ctx)
            print_int("refs", dec_ctx->refs);
        break;

    case AVMEDIA_TYPE_AUDIO:
        s = av_get_sample_fmt_name(par->format);
        if (s) print_str    ("sample_fmt", s);
        else   print_str_opt("sample_fmt", "unknown");
        print_val("sample_rate",     par->sample_rate, unit_hertz_str);
        print_int("channels",        par->channels);

        if (par->channel_layout) {
            av_bprint_clear(&pbuf);
            av_bprint_channel_layout(&pbuf, par->channels, par->channel_layout);
            print_str    ("channel_layout", pbuf.str);
        } else {
            print_str_opt("channel_layout", "unknown");
        }

        print_int("bits_per_sample", av_get_bits_per_sample(par->codec_id));
        break;

    case AVMEDIA_TYPE_SUBTITLE:
        if (par->width)
            print_int("width",       par->width);
        else
            print_str_opt("width",   "N/A");
        if (par->height)
            print_int("height",      par->height);
        else
            print_str_opt("height",  "N/A");
        break;
    }

    if (dec_ctx && dec_ctx->codec && dec_ctx->codec->priv_class && show_private_data) {
        const AVOption *opt = NULL;
        while (opt = av_opt_next(dec_ctx->priv_data,opt)) {
            uint8_t *str;
            if (opt->flags) continue;
            if (av_opt_get(dec_ctx->priv_data, opt->name, 0, &str) >= 0) {
                print_str(opt->name, str);
                av_free(str);
            }
        }
    }

    if (fmt_ctx->iformat->flags & AVFMT_SHOW_IDS) print_fmt    ("id", "0x%x", stream->id);
    else                                          print_str_opt("id", "N/A");
    print_q("r_frame_rate",   stream->r_frame_rate,   '/');
    print_q("avg_frame_rate", stream->avg_frame_rate, '/');
    print_q("time_base",      stream->time_base,      '/');
    print_ts  ("start_pts",   stream->start_time);
    print_time("start_time",  stream->start_time, &stream->time_base);
    print_ts  ("duration_ts", stream->duration);
    print_time("duration",    stream->duration, &stream->time_base);
    if (par->bit_rate > 0)     print_val    ("bit_rate", par->bit_rate, unit_bit_per_second_str);
    else                       print_str_opt("bit_rate", "N/A");
#if FF_API_LAVF_AVCTX
    if (stream->codec->rc_max_rate > 0) print_val ("max_bit_rate", stream->codec->rc_max_rate, unit_bit_per_second_str);
    else                                print_str_opt("max_bit_rate", "N/A");
#endif
    if (dec_ctx && dec_ctx->bits_per_raw_sample > 0) print_fmt("bits_per_raw_sample", "%d", dec_ctx->bits_per_raw_sample);
    else                                             print_str_opt("bits_per_raw_sample", "N/A");
    if (stream->nb_frames) print_fmt    ("nb_frames", "%"PRId64, stream->nb_frames);
    else                   print_str_opt("nb_frames", "N/A");
    if (nb_streams_frames[stream_idx])  print_fmt    ("nb_read_frames", "%"PRIu64, nb_streams_frames[stream_idx]);
    else                                print_str_opt("nb_read_frames", "N/A");
    if (nb_streams_packets[stream_idx]) print_fmt    ("nb_read_packets", "%"PRIu64, nb_streams_packets[stream_idx]);
    else                                print_str_opt("nb_read_packets", "N/A");
    if (do_show_data)
        writer_print_data(w, "extradata", par->extradata,
                                          par->extradata_size);
    writer_print_data_hash(w, "extradata_hash", par->extradata,
                                                par->extradata_size);

    /* Print disposition information */
#define PRINT_DISPOSITION(flagname, name) do {                                \
        print_int(name, !!(stream->disposition & AV_DISPOSITION_##flagname)); \
    } while (0)

    if (do_show_stream_disposition) {
    writer_print_section_header(w, in_program ? SECTION_ID_PROGRAM_STREAM_DISPOSITION : SECTION_ID_STREAM_DISPOSITION);
    PRINT_DISPOSITION(DEFAULT,          "default");
    PRINT_DISPOSITION(DUB,              "dub");
    PRINT_DISPOSITION(ORIGINAL,         "original");
    PRINT_DISPOSITION(COMMENT,          "comment");
    PRINT_DISPOSITION(LYRICS,           "lyrics");
    PRINT_DISPOSITION(KARAOKE,          "karaoke");
    PRINT_DISPOSITION(FORCED,           "forced");
    PRINT_DISPOSITION(HEARING_IMPAIRED, "hearing_impaired");
    PRINT_DISPOSITION(VISUAL_IMPAIRED,  "visual_impaired");
    PRINT_DISPOSITION(CLEAN_EFFECTS,    "clean_effects");
    PRINT_DISPOSITION(ATTACHED_PIC,     "attached_pic");
    PRINT_DISPOSITION(TIMED_THUMBNAILS, "timed_thumbnails");
    writer_print_section_footer(w);
    }

    if (do_show_stream_tags)
        ret = show_tags(w, stream->metadata, in_program ? SECTION_ID_PROGRAM_STREAM_TAGS : SECTION_ID_STREAM_TAGS);

    if (stream->nb_side_data) {
        print_pkt_side_data(w, stream->codecpar, stream->side_data, stream->nb_side_data,
                            SECTION_ID_STREAM_SIDE_DATA_LIST,
                            SECTION_ID_STREAM_SIDE_DATA);
    }

    writer_print_section_footer(w);
    av_bprint_finalize(&pbuf, NULL);
    fflush(stdout);

    return ret;
}