Function dump_stream_meta

tests/api/api-dump-stream-meta-test.c:31–173

#include "libavutil/timestamp.h"

static int dump_stream_meta(const char *input_filename) {
    const AVCodec *codec = NULL;
    AVPacket *pkt = NULL;
    AVFrame *fr = NULL;
    AVFormatContext *fmt_ctx = NULL;
    AVCodecContext *ctx = NULL;
    AVCodecParameters *origin_par = NULL;
    AVStream *st;
    int stream_idx = 0;
    int result;
    char *metadata;

    result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
    if (result < 0) {
        av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
        return result;
    }

    result = avformat_find_stream_info(fmt_ctx, NULL);
    if (result < 0) {
        av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
        goto end;
    }

    if (fmt_ctx->nb_streams > 1) {
        av_log(NULL, AV_LOG_ERROR, "More than one stream found in input!\n");
        goto end;
    }

    origin_par = fmt_ctx->streams[stream_idx]->codecpar;
    st = fmt_ctx->streams[stream_idx];

    result = av_dict_get_string(st->metadata, &metadata, '=', ':');
    if (result < 0)
        goto end;

    printf("Stream ID: %d, codec name: %s, metadata: %s\n", stream_idx,
           avcodec_get_name(origin_par->codec_id),
           strlen(metadata) ? metadata : "N/A");
    av_free(metadata);

    codec = avcodec_find_decoder(origin_par->codec_id);
    if (!codec) {
        av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
        result = AVERROR_DECODER_NOT_FOUND;
        goto end;
    }

    ctx = avcodec_alloc_context3(codec);
    if (!ctx) {
        av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
        result = AVERROR(ENOMEM);
        goto end;
    }

    result = avcodec_parameters_to_context(ctx, origin_par);
    if (result) {
        av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");