+ PARA_ERROR_LOG("failed to set nonblock mode\n");
+ pad->buffer_frames = 1000 * pad->buffer_time / pad->samplerate;
+ PARA_INFO_LOG("max buffered frames: %d\n", pad->buffer_frames);
+ return 1;
+}
+
+/* Open an instance of the alsa writer. */
+static int alsa_open_nobtr(struct writer_node *wn)
+{
+ struct alsa_write_args_info *conf = wn->conf;
+ struct writer_node_group *wng = wn->wng;
+ struct private_alsa_write_data *pad = para_calloc(sizeof(*pad));
+
+ wn->private_data = pad;
+ if (!conf->samplerate_given && wng->samplerate)
+ pad->samplerate = *wng->samplerate;
+ else
+ pad->samplerate = conf->samplerate_arg;
+ if (!conf->channels_given && wng->channels)
+ pad->channels = *wng->channels;
+ else
+ pad->channels = conf->channels_arg;
+ PARA_INFO_LOG("%d channel(s), %dHz\n", pad->channels, pad->samplerate);
+ return 1;
+}
+
+static int alsa_open_btr(struct writer_node *wn)
+{
+ struct alsa_write_args_info *conf = wn->conf;
+ struct private_alsa_write_data *pad = para_calloc(sizeof(*pad));
+ int ret;
+ char *buf = NULL;
+
+ sprintf(wn->task.status, "alsa writer");
+ wn->private_data = pad;
+
+ /* defaults */
+ pad->samplerate = conf->samplerate_arg;
+ pad->channels = conf->channels_arg;
+
+ if (!conf->samplerate_given) { /* config option trumps btr_exec */
+ /* ask parent btr nodes */
+ ret = btr_exec_up(wn->btrn, "samplerate", &buf);
+ if (ret >= 0) {
+ int32_t rate;
+ ret = para_atoi32(buf, &rate);
+ if (ret < 0) /* should not happen */
+ goto out;
+ pad->samplerate = rate;
+ }
+ freep(&buf);
+ }
+
+ if (!conf->channels_given) {
+ ret = btr_exec_up(wn->btrn, "channels", &buf);
+ if (ret >= 0) {
+ int32_t ch;
+ ret = para_atoi32(buf, &ch);
+ if (ret < 0)
+ goto out;
+ pad->channels = ch;
+ }
+ freep(&buf);
+ }
+ PARA_INFO_LOG("%d channel(s), %dHz\n", pad->channels, pad->samplerate);
+ ret = 1;
+out:
+ freep(&buf);
+ if (ret < 0)
+ free(pad);
+ return ret;
+}
+static int alsa_open(struct writer_node *wn)
+{
+ struct alsa_write_args_info *conf = wn->conf;
+
+ if (conf->buffer_tree_given)
+ return alsa_open_btr(wn);
+ else
+ return alsa_open_nobtr(wn);
+