Function parse_variant_stream_mapstring

libavformat/hlsenc.c:1983–2127

}

static int parse_variant_stream_mapstring(AVFormatContext *s)
{
    HLSContext *hls = s->priv_data;
    VariantStream *vs;
    int stream_index, i, j;
    enum AVMediaType codec_type;
    int nb_varstreams = 0, nb_streams;
    char *p, *q, *saveptr1, *saveptr2, *varstr, *keyval;
    const char *val;

    /**
     * Expected format for var_stream_map string is as below:
     * "a:0,v:0 a:1,v:1"
     * "a:0,agroup:a0,default:1,language:ENG a:1,agroup:a1,default:0 v:0,agroup:a0  v:1,agroup:a1"
     * This string specifies how to group the audio, video and subtitle streams
     * into different variant streams. The variant stream groups are separated
     * by space.
     *
     * a:, v:, s: are keys to specify audio, video and subtitle streams
     * respectively. Allowed values are 0 to 9 digits (limited just based on
     * practical usage)
     *
     * agroup: is key to specify audio group. A string can be given as value.
     * sgroup: is key to specify subtitle group. A string can be given as value.
     */
    p = av_strdup(hls->var_stream_map);
    if (!p)
        return AVERROR(ENOMEM);

    q = p;
    while (av_strtok(q, " \t", &saveptr1)) {
        q = NULL;
        nb_varstreams++;
    }
    av_freep(&p);

    hls->var_streams = av_mallocz(sizeof(*hls->var_streams) * nb_varstreams);
    if (!hls->var_streams)
        return AVERROR(ENOMEM);
    hls->nb_varstreams = nb_varstreams;

    p = hls->var_stream_map;
    nb_varstreams = 0;
    while (varstr = av_strtok(p, " \t", &saveptr1)) {
        p = NULL;

        if (nb_varstreams < hls->nb_varstreams) {
            vs = &(hls->var_streams[nb_varstreams]);
            vs->var_stream_idx = nb_varstreams;
            vs->is_default = 0;
            nb_varstreams++;
        } else
            return AVERROR(EINVAL);

        q = varstr;
        while (1) {
            if (!av_strncasecmp(q, "a:", 2) || !av_strncasecmp(q, "v:", 2) ||
                !av_strncasecmp(q, "s:", 2))