fix multiple simultaneous writers

[paraslash.git] / alsa_writer.c

diff --git a/alsa_writer.c b/alsa_writer.c
index 7dab4585d46d221d46692409173d8046e9ab392d..da02ac28a5f7e2e84b94d29900b793c611963b5c 100644 (file)
--- a/alsa_writer.c
+++ b/alsa_writer.c
@@ -170,24 +170,24 @@ static int alsa_write_post_select(struct sched *s, struct writer_node *wn)
 {
        struct private_alsa_data *pad = wn->private_data;
        struct writer_node_group *wng = wn->wng;
-       size_t frames = *wng->loaded / pad->bytes_per_frame;
+       size_t frames = (*wng->loaded - wn->written) / pad->bytes_per_frame;
        snd_pcm_sframes_t ret;
-       unsigned char *data = (unsigned char*)wng->buf;
+       unsigned char *data = (unsigned char*)wng->buf + wn->written;
        struct timeval tv;
 
 //     PARA_INFO_LOG("%zd frames\n", frames);
        if (!frames) {
                if (*wng->input_eof)
-                       ret = *wng->loaded;
-               return 0;
+                       wn->written = *wng->loaded;
+               return 1;
        }
        if (tv_diff(&s->now, &pad->next_chunk, NULL) < 0)
-               return 0;
+               return 1;
        ret = snd_pcm_writei(pad->handle, data, frames);
        if (ret == -EPIPE) {
                PARA_WARNING_LOG("%s", "EPIPE\n");
                snd_pcm_prepare(pad->handle);
-               return 0;
+               return 1;
        }
        if (ret < 0) {
                PARA_WARNING_LOG("%s", "ALSA ERROR\n");
@@ -196,7 +196,8 @@ static int alsa_write_post_select(struct sched *s, struct writer_node *wn)
        ms2tv(pad->buffer_time / 4000, &tv);
 //     ms2tv(1, &tv);
        tv_add(&s->now, &tv, &pad->next_chunk);
-       return ret * pad->bytes_per_frame;
+       wn->written += ret * pad->bytes_per_frame;
+       return 1;
 }
 
 static void alsa_close(struct writer_node *wn)