+/* read file contents into a string */
+static uint8_t *read_file(const char *filename)
+{
+ AVIOContext *pb = NULL;
+ AVIOContext *dyn_buf = NULL;
+ int ret = avio_open(&pb, filename, AVIO_FLAG_READ);
+ uint8_t buf[1024], *str;
+
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Error opening file %s.\n", filename);
+ return NULL;
+ }
+
+ ret = avio_open_dyn_buf(&dyn_buf);
+ if (ret < 0) {
+ avio_closep(&pb);
+ return NULL;
+ }
+ while ((ret = avio_read(pb, buf, sizeof(buf))) > 0)
+ avio_write(dyn_buf, buf, ret);
+ avio_w8(dyn_buf, 0);
+ avio_closep(&pb);
+
+ ret = avio_close_dyn_buf(dyn_buf, &str);
+ if (ret < 0)
+ return NULL;
+ return str;
+}
+
+static char *get_ost_filters(OptionsContext *o, AVFormatContext *oc,
+ OutputStream *ost)
+{
+ AVStream *st = ost->st;
+ char *filter = NULL, *filter_script = NULL;
+
+ MATCH_PER_STREAM_OPT(filter_scripts, str, filter_script, oc, st);
+ MATCH_PER_STREAM_OPT(filters, str, filter, oc, st);
+
+ if (filter_script && filter) {
+ av_log(NULL, AV_LOG_ERROR, "Both -filter and -filter_script set for "
+ "output stream #%d:%d.\n", nb_output_files, st->index);
+ exit_program(1);
+ }
+
+ if (filter_script)
+ return read_file(filter_script);
+ else if (filter)
+ return av_strdup(filter);
+
+ return av_strdup(st->codec->codec_type == AVMEDIA_TYPE_VIDEO ?
+ "null" : "anull");
+}
+