Function parse_adaptation_sets

libavformat/webmdashenc.c:410–476

}

static int parse_adaptation_sets(AVFormatContext *s)
{
    WebMDashMuxContext *w = s->priv_data;
    char *p = w->adaptation_sets;
    char *q;
    enum { new_set, parsed_id, parsing_streams } state;
    if (!w->adaptation_sets) {
        av_log(s, AV_LOG_ERROR, "The 'adaptation_sets' option must be set.\n");
        return AVERROR(EINVAL);
    }
    // syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
    state = new_set;
    while (1) {
        if (*p == '\0') {
            if (state == new_set)
                break;
            else
                return AVERROR(EINVAL);
        } else if (state == new_set && *p == ' ') {
            p++;
            continue;
        } else if (state == new_set && !strncmp(p, "id=", 3)) {
            void *mem = av_realloc(w->as, sizeof(*w->as) * (w->nb_as + 1));
            const char *comma;
            if (mem == NULL)
                return AVERROR(ENOMEM);
            w->as = mem;
            ++w->nb_as;
            w->as[w->nb_as - 1].nb_streams = 0;
            w->as[w->nb_as - 1].streams = NULL;
            p += 3; // consume "id="
            q = w->as[w->nb_as - 1].id;
            comma = strchr(p, ',');
            if (!comma || comma - p >= sizeof(w->as[w->nb_as - 1].id)) {
                av_log(s, AV_LOG_ERROR, "'id' in 'adaptation_sets' is malformed.\n");
                return AVERROR(EINVAL);
            }
            while (*p != ',') *q++ = *p++;
            *q = 0;
            p++;
            state = parsed_id;
        } else if (state == parsed_id && !strncmp(p, "streams=", 8)) {
            p += 8; // consume "streams="
            state = parsing_streams;
        } else if (state == parsing_streams) {
            struct AdaptationSet *as = &w->as[w->nb_as - 1];
            int64_t num;
            int ret = av_reallocp_array(&as->streams, ++as->nb_streams,
                                        sizeof(*as->streams));
            if (ret < 0)
                return ret;
            num = strtoll(p, &q, 10);
            if (!av_isdigit(*p) || (*q != ' ' && *q != '\0' && *q != ',') ||
                num < 0 || num >= s->nb_streams) {
                av_log(s, AV_LOG_ERROR, "Invalid value for 'streams' in adapation_sets.\n");
                return AVERROR(EINVAL);
            }
            as->streams[as->nb_streams - 1] = num;