main part of the native protocol

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@31 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/pacat.c

@@ -0,0 +1,169 @@
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "polyp.h"
+#include "mainloop.h"
+
+static struct pa_context *context = NULL;
+static struct pa_stream *stream = NULL;
+static struct pa_mainloop_api *mainloop_api = NULL;
+
+static void *buffer = NULL;
+static size_t buffer_length = 0, buffer_index = 0;
+
+static void* stdin_source = NULL;
+
+static void context_die_callback(struct pa_context *c, void *userdata) {
+    assert(c);
+    fprintf(stderr, "Connection to server shut down, exiting.\n");
+    mainloop_api->quit(mainloop_api, 1);
+}
+
+static void stream_die_callback(struct pa_stream *s, void *userdata) {
+    assert(s);
+    fprintf(stderr, "Stream deleted, exiting.\n");
+    mainloop_api->quit(mainloop_api, 1);
+}
+
+static void stream_write_callback(struct pa_stream *s, size_t length, void *userdata) {
+    size_t l;
+    assert(s && length);
+    
+    mainloop_api->enable_io(mainloop_api, stdin_source, PA_STREAM_PLAYBACK);
+
+    if (!buffer)
+        return;
+    
+    assert(buffer_length);
+    
+    l = length;
+    if (l > buffer_length)
+        l = buffer_length;
+    
+    pa_stream_write(s, buffer+buffer_index, l);
+    buffer_length -= l;
+    buffer_index += l;
+    
+    if (!buffer_length) {
+        free(buffer);
+        buffer = NULL;
+        buffer_index = buffer_length = 0;
+    }
+}
+
+static void stream_complete_callback(struct pa_context*c, struct pa_stream *s, void *userdata) {
+    assert(c);
+
+    if (!s) {
+        fprintf(stderr, "Stream creation failed.\n");
+        mainloop_api->quit(mainloop_api, 1);
+    }
+
+    stream = s;
+    pa_stream_set_die_callback(stream, stream_die_callback, NULL);
+    pa_stream_set_write_callback(stream, stream_write_callback, NULL);
+}
+
+static void context_complete_callback(struct pa_context *c, int success, void *userdata) {
+    static const struct pa_sample_spec ss = {
+        .format = SAMPLE_S16NE,
+        .rate = 44100,
+        .channels = 2
+    };
+        
+    assert(c && !stream);
+
+    if (!success) {
+        fprintf(stderr, "Connection failed\n");
+        goto fail;
+    }
+    
+    if (pa_stream_new(c, PA_STREAM_PLAYBACK, NULL, "pacat", &ss, NULL, stream_complete_callback, NULL) < 0) {
+        fprintf(stderr, "pa_stream_new() failed.\n");
+        goto fail;
+    }
+
+    return;
+    
+fail:
+    mainloop_api->quit(mainloop_api, 1);
+}
+
+static void stdin_callback(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
+    size_t l;
+    ssize_t r;
+    assert(a == mainloop_api && id && fd == STDIN_FILENO && events == PA_MAINLOOP_API_IO_EVENT_INPUT);
+
+    if (buffer) {
+        mainloop_api->enable_io(mainloop_api, stdin_source, PA_MAINLOOP_API_IO_EVENT_NULL);
+        return;
+    }
+
+    if (!(l = pa_stream_writable_size(stream)))
+        l = 4096;
+    buffer = malloc(l);
+    assert(buffer);
+    if ((r = read(fd, buffer, l)) <= 0) {
+        if (r == 0)
+            mainloop_api->quit(mainloop_api, 0);
+        else {
+            fprintf(stderr, "read() failed: %s\n", strerror(errno));
+            mainloop_api->quit(mainloop_api, 1);
+        }
+
+        return;
+    }
+
+    buffer_length = r;
+    buffer_index = 0;
+}
+
+int main(int argc, char *argv[]) {
+    struct pa_mainloop* m;
+    int ret = 1;
+
+    if (!(m = pa_mainloop_new())) {
+        fprintf(stderr, "pa_mainloop_new() failed.\n");
+        goto quit;
+    }
+
+    mainloop_api = pa_mainloop_get_api(m);
+
+    if (!(stdin_source = mainloop_api->source_io(mainloop_api, STDIN_FILENO, PA_MAINLOOP_API_IO_EVENT_INPUT, stdin_callback, NULL))) {
+        fprintf(stderr, "source_io() failed.\n");
+        goto quit;
+    }
+    
+    if (!(context = pa_context_new(mainloop_api, argv[0]))) {
+        fprintf(stderr, "pa_context_new() failed.\n");
+        goto quit;
+    }
+
+    if (pa_context_connect(context, NULL, context_complete_callback, NULL) < 0) {
+        fprintf(stderr, "pa_context_connext() failed.\n");
+        goto quit;
+    }
+        
+    pa_context_set_die_callback(context, context_die_callback, NULL);
+
+    if (pa_mainloop_run(m, &ret) < 0) {
+        fprintf(stderr, "pa_mainloop_run() failed.\n");
+        goto quit;
+    }
+    
+quit:
+    if (stream)
+        pa_stream_free(stream);
+    if (context)
+        pa_context_free(context);
+    if (m)
+        pa_mainloop_free(m);
+    if (buffer)
+        free(buffer);
+    
+    return ret;
+}