Function avformat_alloc_output_context2

libavformat/mux.c:95–151

}

int avformat_alloc_output_context2(AVFormatContext **avctx, const AVOutputFormat *oformat,
                                   const char *format, const char *filename)
{
    AVFormatContext *s = avformat_alloc_context();
    int ret = 0;

    *avctx = NULL;
    if (!s)
        goto nomem;

    if (!oformat) {
        if (format) {
            oformat = av_guess_format(format, NULL, NULL);
            if (!oformat) {
                av_log(s, AV_LOG_ERROR, "Requested output format '%s' is not known.\n", format);
                ret = AVERROR(EINVAL);
                goto error;
            }
        } else {
            oformat = av_guess_format(NULL, filename, NULL);
            if (!oformat) {
                ret = AVERROR(EINVAL);
                av_log(s, AV_LOG_ERROR,
                       "Unable to choose an output format for '%s'; "
                       "use a standard extension for the filename or specify "
                       "the format manually.\n", filename);
                goto error;
            }
        }
    }

    s->oformat = oformat;
    if (ffofmt(s->oformat)->priv_data_size > 0) {
        s->priv_data = av_mallocz(ffofmt(s->oformat)->priv_data_size);
        if (!s->priv_data)
            goto nomem;
        if (s->oformat->priv_class) {
            *(const AVClass**)s->priv_data= s->oformat->priv_class;
            av_opt_set_defaults(s->priv_data);
        }
    } else
        s->priv_data = NULL;

    if (filename) {
        if (!(s->url = av_strdup(filename)))
            goto nomem;

    }
    *avctx = s;
    return 0;
nomem:
    av_log(s, AV_LOG_ERROR, "Out of memory\n");
    ret = AVERROR(ENOMEM);
error:
    avformat_free_context(s);
    return ret;
}