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authorMax Kellermann <max@duempel.org>2009-08-24 18:57:06 +0200
committerMax Kellermann <max@duempel.org>2009-08-24 18:57:06 +0200
commit4a0d4a02a64774c61840496c8141b89ed31d1d94 (patch)
treeaeb8928d8d7653f4b0e81a53d71ff4d8edb0d6ca /src/output
parent4231ec51c319ee43e06e9ab291696d8f1a546564 (diff)
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output/recorder: new output plugin for recording radio streams
The recorder plugin writes audio played by MPD to a file. This may be useful for recording radio streams. This implementation is incomplete, because support for tags is missing, and MPD should be able to record each track to a different file.
Diffstat (limited to 'src/output')
-rw-r--r--src/output/recorder_output_plugin.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/src/output/recorder_output_plugin.c b/src/output/recorder_output_plugin.c
new file mode 100644
index 000000000..413e5d0d1
--- /dev/null
+++ b/src/output/recorder_output_plugin.c
@@ -0,0 +1,214 @@
+/*
+ * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "output_api.h"
+#include "encoder_plugin.h"
+#include "encoder_list.h"
+
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "recorder"
+
+struct recorder_output {
+ /**
+ * The configured encoder plugin.
+ */
+ struct encoder *encoder;
+
+ /**
+ * The destination file name.
+ */
+ const char *path;
+
+ /**
+ * The destination file descriptor.
+ */
+ int fd;
+
+ /**
+ * The buffer for encoder_read().
+ */
+ char buffer[32768];
+};
+
+/**
+ * The quark used for GError.domain.
+ */
+static inline GQuark
+recorder_output_quark(void)
+{
+ return g_quark_from_static_string("recorder_output");
+}
+
+static void *
+recorder_output_init(G_GNUC_UNUSED const struct audio_format *audio_format,
+ const struct config_param *param, GError **error_r)
+{
+ struct recorder_output *recorder = g_new(struct recorder_output, 1);
+ const char *encoder_name;
+ const struct encoder_plugin *encoder_plugin;
+
+ /* read configuration */
+
+ encoder_name = config_get_block_string(param, "encoder", "vorbis");
+ encoder_plugin = encoder_plugin_get(encoder_name);
+ if (encoder_plugin == NULL) {
+ g_set_error(error_r, recorder_output_quark(), 0,
+ "No such encoder: %s", encoder_name);
+ return NULL;
+ }
+
+ recorder->path = config_get_block_string(param, "path", NULL);
+ if (recorder->path == NULL) {
+ g_set_error(error_r, recorder_output_quark(), 0,
+ "'path' not configured");
+ return NULL;
+ }
+
+ /* initialize encoder */
+
+ recorder->encoder = encoder_init(encoder_plugin, param, error_r);
+ if (recorder->encoder == NULL)
+ return NULL;
+
+ return recorder;
+}
+
+static void
+recorder_output_finish(void *data)
+{
+ struct recorder_output *recorder = data;
+
+ encoder_finish(recorder->encoder);
+ g_free(recorder);
+}
+
+/**
+ * Writes pending data from the encoder to the output file.
+ */
+static bool
+recorder_output_encoder_to_file(struct recorder_output *recorder,
+ GError **error_r)
+{
+ size_t size = 0, position, nbytes;
+
+ assert(recorder->fd >= 0);
+
+ /* read from the encoder */
+
+ size = encoder_read(recorder->encoder, recorder->buffer,
+ sizeof(recorder->buffer));
+ if (size == 0)
+ return true;
+
+ /* write everything into the file */
+
+ position = 0;
+ while (true) {
+ nbytes = write(recorder->fd, recorder->buffer + position,
+ size - position);
+ if (nbytes > 0) {
+ position += (size_t)nbytes;
+ if (position >= size)
+ return true;
+ } else if (nbytes == 0) {
+ /* shouldn't happen for files */
+ g_set_error(error_r, recorder_output_quark(), 0,
+ "write() returned 0");
+ return false;
+ } else if (errno != EINTR) {
+ g_set_error(error_r, recorder_output_quark(), 0,
+ "Failed to write to '%s': %s",
+ recorder->path, g_strerror(errno));
+ return false;
+ }
+ }
+}
+
+static bool
+recorder_output_open(void *data, struct audio_format *audio_format,
+ GError **error_r)
+{
+ struct recorder_output *recorder = data;
+ bool success;
+
+ /* create the output file */
+
+ recorder->fd = creat(recorder->path, 0666);
+ if (recorder->fd < 0) {
+ g_set_error(error_r, recorder_output_quark(), 0,
+ "Failed to create '%s': %s",
+ recorder->path, g_strerror(errno));
+ return false;
+ }
+
+ /* open the encoder */
+
+ success = encoder_open(recorder->encoder, audio_format, error_r);
+ if (!success) {
+ close(recorder->fd);
+ unlink(recorder->path);
+ return false;
+ }
+
+ return true;
+}
+
+static void
+recorder_output_close(void *data)
+{
+ struct recorder_output *recorder = data;
+
+ /* flush the encoder and write the rest to the file */
+
+ if (encoder_flush(recorder->encoder, NULL))
+ recorder_output_encoder_to_file(recorder, NULL);
+
+ /* now really close everything */
+
+ encoder_close(recorder->encoder);
+
+ close(recorder->fd);
+}
+
+static size_t
+recorder_output_play(void *data, const void *chunk, size_t size,
+ GError **error_r)
+{
+ struct recorder_output *recorder = data;
+
+ return encoder_write(recorder->encoder, chunk, size, error_r) &&
+ recorder_output_encoder_to_file(recorder, error_r)
+ ? size : 0;
+}
+
+const struct audio_output_plugin recorder_output_plugin = {
+ .name = "recorder",
+ .init = recorder_output_init,
+ .finish = recorder_output_finish,
+ .open = recorder_output_open,
+ .close = recorder_output_close,
+ .play = recorder_output_play,
+};