audiod: Fix status item parsing for long status items.
[paraslash.git] / write_common.c
index 316c87e..1da78b5 100644 (file)
@@ -1,16 +1,20 @@
 /*
- * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2010 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
 /** \file write_common.c common functions of para_audiod and para_write */
 
+#include <regex.h>
+#include <stdbool.h>
+
 #include "para.h"
 #include "string.h"
 #include "list.h"
 #include "sched.h"
 #include "ggo.h"
+#include "buffer_tree.h"
 #include "write.h"
 #include "error.h"
 
@@ -20,131 +24,6 @@ const char *writer_names[] ={WRITER_NAMES};
 /** the array of supported writers */
 struct writer writers[NUM_SUPPORTED_WRITERS] = {WRITER_ARRAY};
 
-static void wng_pre_select(__a_unused struct sched *s, struct task *t)
-{
-       struct writer_node_group *g = container_of(t, struct writer_node_group, task);
-       int i;
-
-       FOR_EACH_WRITER_NODE(i, g) {
-               struct writer_node *wn = &g->writer_nodes[i];
-               if (!wn->writer->pre_select)
-                       continue;
-               t->error = wn->writer->pre_select(s, wn);
-               if (t->error < 0)
-                       return;
-       }
-}
-
-static void wng_post_select(struct sched *s, struct task *t)
-{
-       struct writer_node_group *g = container_of(t, struct writer_node_group, task);
-       int i;
-       size_t min_written = 0;
-
-       FOR_EACH_WRITER_NODE(i, g) {
-               struct writer_node *wn = &g->writer_nodes[i];
-               t->error = wn->writer->post_select(s, wn);
-               if (t->error < 0)
-                       return;
-               if (!i)
-                       min_written = wn->written;
-               else
-                       min_written = PARA_MIN(min_written, wn->written);
-       }
-       //PARA_INFO_LOG("loaded: %zd, min_written: %zd bytes\n", *g->loaded, min_written);
-       if (min_written) {
-               *g->loaded -= min_written;
-               FOR_EACH_WRITER_NODE(i, g)
-                       g->writer_nodes[i].written -= min_written;
-       }
-       if (!*g->loaded && *g->input_error) {
-               t->error = *g->input_error;
-               return;
-       }
-       if (*g->loaded && min_written) {
-//             PARA_INFO_LOG("moving %zd bytes\n", *g->loaded);
-               memmove(*g->bufp, *g->bufp + min_written, *g->loaded);
-       }
-}
-
-/**
- * call the open function of each writer in the group
- *
- * \param g the writer node group
- *
- * \return If at least one open function returned an error, all successful
- * writer notes get closed and this error value is returned. Upon success, a
- * task associated with \a g is registered to the scheduler and the function
- * returns a positive value.
- * */
-int wng_open(struct writer_node_group *g)
-{
-       int i, ret = 1;
-
-       PARA_NOTICE_LOG("opening wng %p with %d writer(s)\n", g, g->num_writers);
-       FOR_EACH_WRITER_NODE(i, g) {
-               struct writer_node *wn = &g->writer_nodes[i];
-               wn->wng = g;
-               ret = wn->writer->open(wn);
-               if (ret < 0)
-                       goto err_out;
-       }
-       sprintf(g->task.status, "%s", "writer node group");
-       register_task(&g->task);
-       g->open = 1;
-       return 1;
-err_out:
-       PARA_ERROR_LOG("%s\n", para_strerror(-ret));
-       while (i > 0) {
-               struct writer_node *wn = &g->writer_nodes[--i];
-               wn->writer->close(wn);
-       }
-       free(g->writer_nodes);
-       g->num_writers = 0;
-       g->task.error = -E_TASK_UNREGISTERED;
-       return ret;
-}
-
-/**
- * call the close function of each writer in the given group
- *
- * \param g the writer node group to close
- *
- * This function also frees all resources of the given group.
- */
-void wng_close(struct writer_node_group *g)
-{
-       int i;
-
-       if (!g || !g->open)
-               return;
-       PARA_NOTICE_LOG("closing wng with %d writer(s)\n", g->num_writers);
-       FOR_EACH_WRITER_NODE(i, g) {
-               struct writer_node *wn = &g->writer_nodes[i];
-               wn->writer->close(wn);
-       }
-       free(g->writer_nodes);
-       free(g);
-}
-
-/**
- * allocate and initialize a new writer_node_group struct
- *
- * \param num_writers the number of writer nodes for the new group
- *
- * \return Pointer to the new writer node group
- */
-struct writer_node_group *wng_new(unsigned num_writers)
-{
-       struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
-       g->num_writers = num_writers;
-       g->writer_nodes = para_calloc(num_writers
-               * sizeof(struct writer_node));
-       g->task.post_select = wng_post_select;
-       g->task.pre_select = wng_pre_select;
-       return g;
-}
-
 /**
  * Call the init function of each supported paraslash writer.
  */
@@ -196,23 +75,55 @@ void *check_writer_arg(const char *wa, int *writer_num)
        return NULL;
 }
 
+void register_writer_node(struct writer_node *wn, struct btr_node *parent)
+{
+       struct writer *w = writers + wn->writer_num;
+       char *name = make_message("%s writer", writer_names[wn->writer_num]);
+       int ret;
+
+       wn->btrn = btr_new_node(&(struct btr_node_description)
+               EMBRACE(.name = name, .parent = parent,
+               .handler = w->execute, .context = wn));
+       strcpy(wn->task.status, name);
+       free(name);
+       ret = w->open(wn);
+       wn->task.post_select = w->post_select;
+       wn->task.pre_select = w->pre_select;
+       register_task(&wn->task);
+}
+
 /**
- * setup a writer node group with only one writer, the default writer
+ * Setup a writer node with the default writer.
+ *
+ * If arg is \p NULL, the OS-dependent default writer is used with an empty
+ * configuration string.  It defaults to alsa for Linux, osx for OS X, oss for
+ * *BSD and the file writer if neither of these is supported.
  *
- * The writer which is set up depends on the OS. It defaults to alsa for Linux,
- * osx_write for OS X, file writer if neither of these is supported.
+ * Once the writer configuration has been retrieved, a writer node is created,
+ * its buffer tree node is added to the buffer tree as a child of the given
+ * parent.
  *
- * \return pointer to the allocated writer node group
+ * Finally, the new writer node's taks structure is initialized and registered
+ * to the paraslash scheduler.
+ *
+ * \return A pointer to the allocated writer node group.
  */
-struct writer_node_group *setup_default_wng(void)
+int setup_writer_node(const char *arg, struct btr_node *parent,
+               struct writer_node *wn)
 {
-       struct writer_node_group *wng = wng_new(1);
-       wng->writer_nodes[0].writer = &writers[DEFAULT_WRITER];
-       PARA_INFO_LOG("using default writer: %s %p\n",
-               writer_names[DEFAULT_WRITER], writers[DEFAULT_WRITER].parse_config);
-       wng->writer_nodes[0].conf = writers[DEFAULT_WRITER].parse_config("");
-       return wng;
+       if (arg)
+               wn->conf = check_writer_arg(arg, &wn->writer_num);
+       else {
+               wn->writer_num = DEFAULT_WRITER;
+               wn->conf = writers[DEFAULT_WRITER].parse_config("");
+       }
+       if (!wn->conf)
+               return -E_WRITE_COMMON_SYNTAX;
+       register_writer_node(wn, parent);
+       return 1;
 }
+
+
 /**
  * Print the help text of all writers to stdout.
  *
@@ -235,3 +146,31 @@ void print_writer_helps(int detailed)
                ggo_print_help(&w->help, detailed);
        }
 }
+
+static int get_btr_value(struct btr_node *btrn, const char *key, int32_t *result)
+{
+       char *buf = NULL;
+       int ret = btr_exec_up(btrn, key, &buf);
+
+       if (ret < 0)
+               return ret;
+       ret = para_atoi32(buf, result);
+       free(buf);
+       return ret;
+}
+
+/*
+ * Ask parent btr nodes for the samplerate of the current stream.
+ */
+int get_btr_samplerate(struct btr_node *btrn, int32_t *result)
+{
+       return get_btr_value(btrn, "samplerate", result);
+}
+
+/*
+ * Ask parent btr nodes for the channel count of the current stream.
+ */
+int get_btr_channels(struct btr_node *btrn, int32_t *result)
+{
+       return get_btr_value(btrn, "channels", result);
+}