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/*
* Copyright (C) 2003-2011 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 "config.h"
#include "recorder_output_plugin.h"
#include "output_api.h"
#include "encoder_plugin.h"
#include "encoder_list.h"
#include "fd_util.h"
#include "open.h"
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.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);
goto failure;
}
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");
goto failure;
}
/* initialize encoder */
recorder->encoder = encoder_init(encoder_plugin, param, error_r);
if (recorder->encoder == NULL)
goto failure;
return recorder;
failure:
g_free(recorder);
return NULL;
}
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 = open_cloexec(recorder->path,
O_CREAT|O_WRONLY|O_TRUNC|O_BINARY,
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,
};
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