+static int alsa_write_post_select(__a_unused struct sched *s, void *context)
+{
+ struct writer_node *wn = context;
+ struct private_alsa_write_data *pad = wn->private_data;
+ struct btr_node *btrn = wn->btrn;
+ char *data;
+ size_t bytes;
+ snd_pcm_sframes_t frames;
+ int ret;
+
+ ret = task_get_notification(wn->task);
+ if (ret < 0)
+ goto err;
+again:
+ ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
+ if (ret == 0)
+ return 0;
+ btr_merge(btrn, wn->min_iqs);
+ bytes = btr_next_buffer(btrn, &data);
+ if (ret < 0 || bytes < wn->min_iqs) { /* eof */
+ assert(btr_no_parent(btrn));
+ ret = -E_WRITE_COMMON_EOF;
+ if (!pad)
+ goto err;
+ /* wait until pending frames are played */
+ if (pad->drain_barrier.tv_sec == 0) {
+ PARA_DEBUG_LOG("waiting for device to drain\n");
+ tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
+ &pad->drain_barrier);
+ return 0;
+ }
+ if (tv_diff(now, &pad->drain_barrier, NULL) > 0)
+ goto err;
+ return 0;
+ }
+ if (!pad) {
+ int32_t val;
+
+ if (bytes == 0) /* no data available */
+ return 0;
+ pad = para_calloc(sizeof(*pad));
+ get_btr_sample_rate(btrn, &val);
+ pad->sample_rate = val;
+ get_btr_channels(btrn, &val);
+ pad->channels = val;
+ get_btr_sample_format(btrn, &val);
+ pad->sample_format = get_alsa_pcm_format(val);
+
+ PARA_INFO_LOG("%d channel(s), %dHz\n", pad->channels,
+ pad->sample_rate);
+ ret = alsa_init(pad, wn->conf);
+ if (ret < 0) {
+ free(pad);
+ goto err;
+ }
+ wn->private_data = pad;
+ wn->min_iqs = pad->bytes_per_frame;
+ goto again;
+ }
+ frames = bytes / pad->bytes_per_frame;
+ frames = snd_pcm_writei(pad->handle, data, frames);
+ if (frames == 0 || frames == -EAGAIN) {
+ char buf[100];
+ if (pad->poll_fd >= 0 && FD_ISSET(pad->poll_fd, &s->rfds))
+ if (read(pad->poll_fd, buf, 100))
+ do_nothing;
+ return 0;
+ }
+ if (frames > 0) {
+ btr_consume(btrn, frames * pad->bytes_per_frame);
+ goto again;
+ }
+ if (frames == -EPIPE) {
+ PARA_WARNING_LOG("underrun (tried to write %zu bytes)\n", bytes);
+ snd_pcm_prepare(pad->handle);
+ return 0;
+ }
+ PARA_ERROR_LOG("alsa write error: %s\n", snd_strerror(-frames));
+ ret = -E_ALSA;
+err:
+ assert(ret < 0);
+ btr_remove_node(&wn->btrn);
+ return ret;
+}
+
+__malloc static void *alsa_parse_config_or_die(int argc, char **argv)