X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=play.c;h=e1fdb2ef9fb44f3e68554a80b79508456cf2cc07;hp=713a1a69d6f9b2b4e46798fed64239bb2502ecbd;hb=773bdfd137b4d4bb350903a1cb6b25ef304b3e0a;hpb=e0e5a7c1a04c6a2ee4a475e823657e06e6df2f99

diff --git a/play.c b/play.c
index 713a1a69..e1fdb2ef 100644
--- a/play.c
+++ b/play.c
@@ -28,77 +28,107 @@
 #include "fd.h"
 #include "play.cmdline.h"
 #include <alsa/asoundlib.h>
+#include "string.h"
+#include "error.h"
 
-enum {	E_BROKEN_CONF,		/* Broken configuration for this PCM */
-	E_ACCESS_TYPE,		/* Access type not available */
-	E_SAMPLE_FORMAT,	/* Sample format not available */
-	E_CHANNEL_COUNT,	/* Channels count not available */
-	E_HW_PARAMS,		/* Unable to install hw params */
-	E_SW_PARAMS,		/* Unable to install sw params */
-	E_BAD_PERIOD,		/* Can't use period equal to buffer size */
-	E_GET_XFER,		/* Unable to obtain xfer align */
-	E_SET_XFER,		/* snd_pcm_sw_params_set_xfer_align failed */
-	E_MEM,			/* not enough memory */
-	E_READ,			/* read error */
-	E_WRITE,		/* write error */
-	E_PIPE,			/* write to pipe with other side closed */
-	E_PCM_OPEN,		/* unable to open pcm */
-	E_SND_PCM_INFO,		/* pcm info error */
-	E_GET_BUFFER_TIME,	/* snd_pcm_hw_params_get_buffer_time_max failed */
-	E_SET_BUFFER_TIME,	/* snd_pcm_hw_params_set_buffer_time_near failed */
-	E_SET_RATE,		/* snd_pcm_hw_params_set_rate_near failed */
-	E_START_THRESHOLD,	/* snd_pcm_sw_params_set_start_threshold failed */
-	E_STOP_THRESHOLD,	/* snd_pcm_sw_params_set_stop_threshold failed */
-	E_LOG,			/* snd_output_stdio_attach failed */
-	E_SYNTAX		/* could not parse start_time option */
+/*
+files:
+~~~~~~
+write.c
+write.h wr
+write_common.c
+write_common.h: decratation of the wng funcs
+alsa_writer.c
+*/
+
+/* write.h */
+enum writer_enum {WRITER_ENUM};
+
+/* write.h */
+struct writer_node {
+	struct writer *writer;
+	void *private_data;
+	int chunk_bytes;
 };
 
-#define FORMAT SND_PCM_FORMAT_S16_LE
+/* write.h */
+struct writer {
+	void (*init)(struct writer *w);
+	int (*open)(struct writer_node *);
+	int (*write)(char *data, size_t nbytes, struct writer_node *);
+	void (*close)(struct writer_node *);
+	void (*shutdown)(struct writer_node *);
+};
+
+/* write.h */
+struct writer_node_group {
+	unsigned num_writers;
+	struct writer_node *writer_nodes;
+	int *written;
+	size_t max_chunk_bytes;
+	int eof;
+};
+
+/* write.h */
+#define FOR_EACH_WRITER_NODE(i, wng) for (i = 0; i < (wng)->num_writers; i++)
+#define FOR_EACH_WRITER(i) for (i = 0; i < NUM_SUPPORTED_WRITERS; i++)
 
-#define EXIT(EXP) \
-do { if (EXP) \
-	fprintf (stderr, "error: " #EXP "\n"); exit(EXP);} \
-while (0)
+DECLARE_WRITER_INITS;
 
-static snd_pcm_t *handle;
+
+/* write.c */
 static unsigned char *audiobuf;
-static snd_pcm_uframes_t chunk_size;
-static size_t bytes_per_frame;
 static struct timeval *start_time;
 static struct gengetopt_args_info conf;
 
-void para_log(__a_unused int ll, const char* fmt,...)
+/* write.c */
+INIT_PLAY_ERRLISTS;
+
+/* write.c */
+void para_log(int ll, const char* fmt,...)
 {
 	va_list argp;
 
+	if (ll < conf.loglevel_arg)
+		return;
 	va_start(argp, fmt);
 	vfprintf(stderr, fmt, argp);
 	va_end(argp);
 }
 
-/*
- * read_wav_header - read WAV_HEADER_LEN bytes from stdin to audio buffer
+/* write.c */
+/**
+ * read WAV_HEADER_LEN bytes from stdin to audio buffer
  *
- * Exit on errors and on eof before WAV_HEADER_LEN could be read.
+ * \return -E_READ_HDR on errors and on eof before WAV_HEADER_LEN could be
+ * read. A positive return value indicates success.
  */
-static void read_wav_header(void)
+static int read_wav_header(void)
 {
 	ssize_t ret, count = 0;
 
 	while (count < WAV_HEADER_LEN) {
 		ret = read(STDIN_FILENO, audiobuf + count, WAV_HEADER_LEN - count);
 		if (ret <= 0)
-			EXIT(E_READ);
+			return -E_READ_HDR;
 		count += ret;
 	}
+	return 1;
 }
 
+/* alsa_writer.c */
+#define FORMAT SND_PCM_FORMAT_S16_LE
+struct private_alsa_data {
+	snd_pcm_t *handle;
+	size_t bytes_per_frame;
+};
+
 /*
- * set_alsa_params - Prepare the PCM handle for writing
+ * open and prepare the PCM handle for writing
  *
  * Install PCM software and hardware configuration. Exit on errors.
  */
-static void set_alsa_params(void)
+static int alsa_open(struct writer_node *w)
 {
 	snd_pcm_hw_params_t *hwparams;
 	snd_pcm_sw_params_t *swparams;
@@ -106,91 +136,186 @@ static void set_alsa_params(void)
 		stop_threshold;
 	unsigned buffer_time = 0;
 	int err;
+	snd_pcm_info_t *info;
+	snd_output_t *log;
+	snd_pcm_uframes_t period_size;
+	struct private_alsa_data *pad = para_malloc(sizeof(struct private_alsa_data));
+	w->private_data = pad;
+
+	snd_pcm_info_alloca(&info);
+	if (snd_output_stdio_attach(&log, stderr, 0) < 0)
+		return -E_ALSA_LOG;
+	err = snd_pcm_open(&pad->handle, conf.device_arg,
+		SND_PCM_STREAM_PLAYBACK, 0);
+	if (err < 0)
+		return -E_PCM_OPEN;
+	if ((err = snd_pcm_info(pad->handle, info)) < 0)
+		return -E_SND_PCM_INFO;
 
 	snd_pcm_hw_params_alloca(&hwparams);
 	snd_pcm_sw_params_alloca(&swparams);
-	if (snd_pcm_hw_params_any(handle, hwparams) < 0)
-		EXIT(E_BROKEN_CONF);
-	if (snd_pcm_hw_params_set_access(handle, hwparams,
+	if (snd_pcm_hw_params_any(pad->handle, hwparams) < 0)
+		return -E_BROKEN_CONF;
+	if (snd_pcm_hw_params_set_access(pad->handle, hwparams,
 			SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
-		EXIT(E_ACCESS_TYPE);
-	if (snd_pcm_hw_params_set_format(handle, hwparams, FORMAT) < 0)
-		EXIT(E_SAMPLE_FORMAT);
-	if (snd_pcm_hw_params_set_channels(handle, hwparams, conf.channels_arg) < 0)
-		EXIT(E_CHANNEL_COUNT);
-	if (snd_pcm_hw_params_set_rate_near(handle, hwparams,
+		return -E_ACCESS_TYPE;
+	if (snd_pcm_hw_params_set_format(pad->handle, hwparams, FORMAT) < 0)
+		return -E_SAMPLE_FORMAT;
+	if (snd_pcm_hw_params_set_channels(pad->handle, hwparams,
+			conf.channels_arg) < 0)
+		return -E_CHANNEL_COUNT;
+	if (snd_pcm_hw_params_set_rate_near(pad->handle, hwparams,
 			(unsigned int*) &conf.sample_rate_arg, 0) < 0)
-		EXIT(E_SET_RATE);
+		return -E_SET_RATE;
 	err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &buffer_time, 0);
 	if (err < 0 || !buffer_time)
-		EXIT(E_GET_BUFFER_TIME);
+		return -E_GET_BUFFER_TIME;
 	PARA_DEBUG_LOG("buffer time: %d\n", buffer_time);
-	if (snd_pcm_hw_params_set_buffer_time_near(handle, hwparams,
+	if (snd_pcm_hw_params_set_buffer_time_near(pad->handle, hwparams,
 			&buffer_time, 0) < 0)
-		EXIT(E_SET_BUFFER_TIME);
-	if (snd_pcm_hw_params(handle, hwparams) < 0)
-		EXIT(E_HW_PARAMS);
-	snd_pcm_hw_params_get_period_size(hwparams, &chunk_size, 0);
+		return -E_SET_BUFFER_TIME;
+	if (snd_pcm_hw_params(pad->handle, hwparams) < 0)
+		return -E_HW_PARAMS;
+	snd_pcm_hw_params_get_period_size(hwparams, &period_size, 0);
 	snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
-	PARA_DEBUG_LOG("buffer size: %lu, period_size: %lu\n", buffer_size, chunk_size);
-	if (chunk_size == buffer_size)
-		EXIT(E_BAD_PERIOD);
-	snd_pcm_sw_params_current(handle, swparams);
+	PARA_DEBUG_LOG("buffer size: %lu, period_size: %lu\n", buffer_size,
+		period_size);
+	if (period_size == buffer_size)
+		return -E_BAD_PERIOD;
+	snd_pcm_sw_params_current(pad->handle, swparams);
 	err = snd_pcm_sw_params_get_xfer_align(swparams, &xfer_align);
 	if (err < 0 || !xfer_align)
-		EXIT(E_GET_XFER);
-//	snd_pcm_sw_params_set_sleep_min(handle, swparams, 0);
-	snd_pcm_sw_params_set_avail_min(handle, swparams, chunk_size);
+		return -E_GET_XFER;
+	snd_pcm_sw_params_set_avail_min(pad->handle, swparams, period_size);
 	/* round to closest transfer boundary */
 	start_threshold = (buffer_size / xfer_align) * xfer_align;
 	if (start_threshold < 1)
 		start_threshold = 1;
-	if (snd_pcm_sw_params_set_start_threshold(handle, swparams,
+	if (snd_pcm_sw_params_set_start_threshold(pad->handle, swparams,
 			start_threshold) < 0)
-		EXIT(E_START_THRESHOLD);
+		return -E_START_THRESHOLD;
 	stop_threshold = buffer_size;
-	if (snd_pcm_sw_params_set_stop_threshold(handle, swparams,
+	if (snd_pcm_sw_params_set_stop_threshold(pad->handle, swparams,
 			stop_threshold) < 0)
-		EXIT(E_STOP_THRESHOLD);
-	if (snd_pcm_sw_params_set_xfer_align(handle, swparams, xfer_align) < 0)
-		EXIT(E_SET_XFER);
-	if (snd_pcm_sw_params(handle, swparams) < 0)
-		EXIT(E_SW_PARAMS);
-	bytes_per_frame = snd_pcm_format_physical_width(FORMAT) * conf.channels_arg / 8;
+		return -E_STOP_THRESHOLD;
+	if (snd_pcm_sw_params_set_xfer_align(pad->handle, swparams,
+			xfer_align) < 0)
+		return -E_SET_XFER;
+	if (snd_pcm_sw_params(pad->handle, swparams) < 0)
+		return -E_SW_PARAMS;
+	pad->bytes_per_frame = snd_pcm_format_physical_width(FORMAT)
+		* conf.channels_arg / 8;
+	return period_size * pad->bytes_per_frame;
 }
 
-/*
- * pcm_write - push out pcm frames
+/* alsa_writer.c */
+/**
+ * push out pcm frames
  * \param data pointer do data to be written
- * \param count number of frames
+ * \param nbytes number of bytes (not frames)
  *
- * \return Number of bytes written. Exit on errors.
+ * \return Number of bytes written, -E_ALSA_WRITE on errors.
  */
-static snd_pcm_sframes_t pcm_write(u_char *data, size_t count)
+static int alsa_write(char *data, size_t nbytes, struct writer_node *wn)
 {
+	struct private_alsa_data *pad = wn->private_data;
+	size_t frames = nbytes / pad->bytes_per_frame;
+	unsigned char *d = data;
 	snd_pcm_sframes_t r, result = 0;
-	while (count > 0) {
+
+	while (frames > 0) {
 		/* write interleaved frames */
-		r = snd_pcm_writei(handle, data, count);
+		r = snd_pcm_writei(pad->handle, d, frames);
 		if (r < 0)
 			PARA_ERROR_LOG("write error: %s\n", snd_strerror(r));
-		if (r == -EAGAIN || (r >= 0 && r < count))
-			snd_pcm_wait(handle, 1);
+		if (r == -EAGAIN || (r >= 0 && r < frames))
+			snd_pcm_wait(pad->handle, 1);
 		else if (r == -EPIPE)
-			snd_pcm_prepare(handle);
+			snd_pcm_prepare(pad->handle);
 		else if (r < 0)
-			EXIT(E_WRITE);
+			return -E_ALSA_WRITE;
 		if (r > 0) {
 			result += r;
-			count -= r;
-			data += r * bytes_per_frame;
+			frames -= r;
+			d += r * pad->bytes_per_frame;
 		}
 	}
-	return result;
+	return result * pad->bytes_per_frame;
 }
 
-/*
- * start_time_in_future - check if current time is later than start_time
+/* alsa_writer.c */
+static void alsa_close(struct writer_node *wn)
+{
+	struct private_alsa_data *pad = wn->private_data;
+	snd_pcm_drain(pad->handle);
+	snd_pcm_close(pad->handle);
+	snd_config_update_free_global();
+	free(pad);
+}
+
+/* alsa_writer.c */
+void alsa_writer_init(struct writer *w)
+{
+	w->open = alsa_open;
+	w->write = alsa_write;
+	w->close = alsa_close;
+	w->shutdown = NULL; /* nothing to do */
+}
+
+
+
+
+/* file_writer.c */
+
+struct private_file_writer_data {
+	int fd;
+};
+static int file_writer_open(struct writer_node *w)
+{
+	struct private_file_writer_data *pfwd = para_calloc(
+		sizeof(struct private_file_writer_data));
+	char *tmp = para_tmpname(), *home = para_homedir(),
+		*filename = make_message("%s/.paraslash/%s", home, tmp);
+
+	free(home);
+	free(tmp);
+	w->private_data = pfwd;
+	pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
+	free(filename);
+	if (pfwd->fd >= 0)
+		return 8192;
+	free(pfwd);
+	return -E_FW_OPEN;
+}
+
+static int file_writer_write(char *data, size_t nbytes, struct writer_node *wn)
+{
+	struct private_file_writer_data *pfwd = wn->private_data;
+	int ret = write(pfwd->fd, data, nbytes);
+	if (ret < 0)
+		ret = -E_FW_WRITE;
+	return ret;
+}
+
+static void file_writer_close(struct writer_node *wn)
+{
+	struct private_file_writer_data *pfwd = wn->private_data;
+	close(pfwd->fd);
+	free(pfwd);
+}
+
+void file_writer_init(struct writer *w)
+{
+	w->open = file_writer_open;
+	w->write = file_writer_write;
+	w->close = file_writer_close;
+	w->shutdown = NULL; /* nothing to do */
+}
+
+
+/* write.c */
+/**
+ * check if current time is later than start_time
  * \param diff pointer to write remaining time to
  *
  * If start_time was not given, or current time is later than given
@@ -209,8 +334,9 @@ static int start_time_in_future(struct timeval *diff)
 	return tv_diff(start_time, &now, diff) > 0? 1 : 0;
 }
 
-/*
- * do_initial_delay - sleep until time given at command line
+/* write.c */
+/**
+ * sleep until time given at command line
  *
  * This is called if the initial buffer is filled. It returns
  * immediately if no start_time was given at the command line
@@ -224,61 +350,274 @@ static void do_initial_delay(struct timeval *delay)
 	while (start_time_in_future(delay));
 }
 
-/*
- * play_pcm - play raw pcm data
+/* write.c */
+static int read_stdin(char *buf, size_t bytes_to_load, size_t *loaded)
+{
+	ssize_t ret;
+
+	while (*loaded < bytes_to_load) {
+		ret = read(STDIN_FILENO, buf + *loaded, bytes_to_load - *loaded);
+		if (ret <= 0) {
+			if (ret < 0)
+				ret = -E_READ_STDIN;
+			return ret;
+		}
+		*loaded += ret;
+	}
+	return 1;
+}
+
+/* write_common.c */
+
+const char *writer_names[] ={WRITER_NAMES};
+static struct writer writers[NUM_SUPPORTED_WRITERS] = {WRITER_ARRAY};
+
+int wng_write(struct writer_node_group *g, char *buf, size_t *loaded)
+{
+	int ret, i, need_more_writes = 1;
+	size_t min_written = 0;
+
+	while (need_more_writes) {
+		need_more_writes = 0;
+		FOR_EACH_WRITER_NODE(i, g) {
+			size_t w = g->written[i];
+			unsigned char *p = buf + w;
+			int bytes_to_write;
+			struct writer_node *wn = &g->writer_nodes[i];
+			if (!i)
+				min_written = w;
+			else
+				min_written = PARA_MIN(min_written, w);
+			if (w == *loaded)
+				continue;
+			if (!g->eof && (*loaded < wn->chunk_bytes + w))
+				continue;
+			bytes_to_write = PARA_MIN(wn->chunk_bytes,
+				*loaded - w);
+			ret = wn->writer->write(p, bytes_to_write, wn);
+			if (ret < 0)
+				goto out;
+			if (ret != bytes_to_write)
+				PARA_WARNING_LOG("short write: %d/%d\n", ret,
+					bytes_to_write);
+			g->written[i] += ret;
+			need_more_writes = 1;
+		}
+	}
+	*loaded -= min_written;
+	ret = 0;
+	if (g->eof)
+		goto out;
+	if (*loaded)
+		memmove(buf, buf + min_written, *loaded);
+	FOR_EACH_WRITER_NODE(i, g)
+		g->written[i] -= min_written;
+	ret = 1;
+out:
+	return ret;
+}
+
+/* write_common.c */
+int wng_open(struct writer_node_group *g)
+{
+	int i, ret = 1;
+
+	FOR_EACH_WRITER_NODE(i, g) {
+		struct writer_node *wn = &g->writer_nodes[i];
+		ret = wn->writer->open(wn);
+		if (ret < 0)
+			goto out;
+		wn->chunk_bytes = ret;
+		g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
+	}
+out:
+	return ret;
+}
+
+/* write_common.c */
+void wng_close(struct writer_node_group *g)
+{
+	int i;
+
+	FOR_EACH_WRITER_NODE(i, g) {
+		struct writer_node *wn = &g->writer_nodes[i];
+		wn->writer->close(wn);
+	}
+}
+
+/* write.c */
+/**
+ * play raw pcm data
  * \param loaded number of bytes already loaded
  *
  * If start_time was given, prebuffer data until buffer is full or
  * start_time is reached. In any case, do not start playing before
  * start_time.
+ *
+ * \return positive on success, negative on errors.
  */
-static void play_pcm(size_t loaded)
+static int pcm_write(struct writer_node_group *wng, size_t loaded)
 {
-	size_t chunk_bytes, bufsize, written = 0, prebuf_size;
-	ssize_t ret;
-	unsigned char *p;
+	size_t bufsize, prebuf_size, bytes_to_load;
 	struct timeval delay;
+	int ret, not_yet_started = 1;
 
-	set_alsa_params();
-	chunk_bytes = chunk_size * bytes_per_frame;
-	bufsize = (conf.bufsize_arg * 1024 / chunk_bytes) * chunk_bytes;
-	audiobuf = realloc(audiobuf, bufsize);
-	if (!audiobuf)
-		EXIT(E_MEM);
+	ret = wng_open(wng);
+	if (ret < 0)
+		goto out;
+	PARA_INFO_LOG("max chunk_bytes: %d\n", wng->max_chunk_bytes);
+	bufsize = (conf.bufsize_arg * 1024 / wng->max_chunk_bytes)
+		* wng->max_chunk_bytes;
+	audiobuf = para_realloc(audiobuf, bufsize);
 	prebuf_size = conf.prebuffer_arg * bufsize / 100;
+	bytes_to_load =  PARA_MAX(prebuf_size, wng->max_chunk_bytes);
+	ret = read_stdin(audiobuf, bytes_to_load, &loaded);
+	if (ret <= 0 || loaded < bytes_to_load) {
+		if (ret >= 0)
+			ret = -E_PREMATURE_END;
+		goto out;
+	}
+	if (not_yet_started && start_time && start_time_in_future(&delay))
+		do_initial_delay(&delay);
+	not_yet_started = 0;
 again:
-	if (!written) {
-		if (loaded < prebuf_size)
-			goto read;
-		if (start_time && start_time_in_future(&delay)) {
-			do_initial_delay(&delay);
-			start_time = NULL;
+	ret = wng_write(wng, audiobuf, &loaded);
+	if (ret <= 0)
+		goto out;
+	ret = -E_PLAY_OVERRUN;
+	if (loaded >= bufsize)
+		goto out;
+	bytes_to_load = PARA_MIN(wng->max_chunk_bytes, bufsize);
+	ret = read_stdin(audiobuf, bytes_to_load, &loaded);
+	if (ret < 0)
+		goto out;
+	if (!ret)
+		wng->eof = 1;
+	goto again;
+out:
+	wng_close(wng);
+	return ret;
+}
+
+/* writer_node.c */
+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->written = para_calloc(num_writers * sizeof(size_t));
+	return g;
+}
+
+/* writer_node.c */
+void wng_destroy(struct writer_node_group *g)
+{
+	if (!g)
+		return;
+	free(g->written);
+	free(g->writer_nodes);
+	free(g);
+}
+
+void init_supported_writers(void)
+{
+	int i;
+
+	FOR_EACH_WRITER(i)
+		writers[i].init(&writers[i]);
+}
+
+int check_writer_arg(const char *arg)
+{
+	int i, ret = -E_PLAY_SYNTAX;
+	char *a = para_strdup(arg), *p = strchr(a, ':');
+	if (p)
+		*p = '\0';
+	p++;
+	FOR_EACH_WRITER(i) {
+		if (strcmp(writer_names[i], a))
+			continue;
+		ret = i;
+		goto out;
+	}
+out:
+	free(a);
+	return ret;
+}
+
+struct writer_node_group *setup_default_wng(void)
+{
+	struct writer_node_group *wng = wng_new(1);
+	enum writer_enum default_writer;
+
+	if (NUM_SUPPORTED_WRITERS == 1)
+		default_writer = FILE_WRITE;
+	else
+		default_writer = 1;
+	wng->writer_nodes[0].writer = &writers[default_writer];
+	PARA_INFO_LOG("using default writer: %s\n",
+		writer_names[default_writer]);
+	return wng;
+}
+
+/* write.c */
+
+struct writer_node_group *check_args(void)
+{
+	int i, ret = -E_PLAY_SYNTAX;
+	static struct timeval tv;
+	struct writer_node_group *wng = NULL;
+
+	if (conf.list_writers_given) {
+		char *msg = NULL;
+		FOR_EACH_WRITER(i) {
+			char *tmp = make_message("%s%s%s",
+				i? msg : "",
+				i? " " : "",
+				writer_names[i]);
+			free(msg);
+			msg = tmp;
 		}
+		fprintf(stderr, "%s\n", msg);
+		free(msg);
+		exit(EXIT_SUCCESS);
+	}
+	if (conf.prebuffer_arg < 0 || conf.prebuffer_arg > 100)
+		goto out;
+	if (conf.start_time_given) {
+		long unsigned sec, usec;
+		if (sscanf(conf.start_time_arg, "%lu:%lu",
+				&sec, &usec) != 2)
+			goto out;
+		tv.tv_sec = sec;
+		tv.tv_usec = usec;
+		start_time = &tv;
 	}
-	p = audiobuf;
-	while (loaded >= chunk_bytes) {
-		ret = pcm_write(p, chunk_size) * bytes_per_frame;
-		p += ret;
-		written += ret;
-		loaded -= ret;
+	if (!conf.writer_given) {
+		wng = setup_default_wng();
+		ret = 1;
+		goto out;
 	}
-	if (loaded && p != audiobuf)
-		memcpy(audiobuf, p, loaded);
-read:
-	ret = read(STDIN_FILENO, audiobuf + loaded, bufsize - loaded);
-	if (ret < 0)
-		EXIT(E_READ);
-	if (ret) {
-		loaded += ret;
-		goto again;
+	wng = wng_new(conf.writer_given);
+	for (i = 0; i < conf.writer_given; i++) {
+		ret = check_writer_arg(conf.writer_arg[i]);
+		if (ret < 0)
+			goto out;
+		wng->writer_nodes[i].writer = &writers[ret];
 	}
-	snd_pcm_drain(handle);
+	ret = 1;
+out:
+	if (ret > 0)
+		return wng;
+	free(wng);
+	return NULL;
 }
 
-/*
- * check_wave - test if audio buffer contains a valid wave header
+/**
+ * test if audio buffer contains a valid wave header
  *
- * If not, return 0, otherwise, store number of channels and sample rate
+ * \return If not, return 0, otherwise, store number of channels and sample rate
  * in struct conf and return WAV_HEADER_LEN.
  */
 static size_t check_wave(void)
@@ -291,35 +630,26 @@ static size_t check_wave(void)
 	return 0;
 }
 
+/* write.c */
 int main(int argc, char *argv[])
 {
-	snd_pcm_info_t *info;
-	snd_output_t *log;
-	struct timeval tv;
-	int err;
+	int ret = -E_PLAY_SYNTAX;
+	struct writer_node_group *wng = NULL;
 
 	cmdline_parser(argc, argv, &conf);
-	if (conf.start_time_given) {
-		if (sscanf(conf.start_time_arg, "%lu:%lu",
-				&tv.tv_sec, &tv.tv_usec) != 2)
-			EXIT(E_SYNTAX);
-		start_time = &tv;
-	}
-	snd_pcm_info_alloca(&info);
-	if (snd_output_stdio_attach(&log, stderr, 0) < 0)
-		EXIT(E_LOG);
-	err = snd_pcm_open(&handle, conf.device_arg,
-		SND_PCM_STREAM_PLAYBACK, 0);
-	if (err < 0)
-		EXIT(E_PCM_OPEN);
-	if ((err = snd_pcm_info(handle, info)) < 0)
-		EXIT(E_SND_PCM_INFO);
-	audiobuf = malloc(WAV_HEADER_LEN);
-	read_wav_header();
-	play_pcm(check_wave());
-	snd_pcm_close(handle);
+	wng = check_args();
+	if (!wng)
+		goto out;
+	init_supported_writers();
+	audiobuf = para_malloc(WAV_HEADER_LEN);
+	ret = read_wav_header();
+	if (ret < 0)
+		goto out;
+	ret = pcm_write(wng, check_wave());
+out:
+	wng_destroy(wng);
 	free(audiobuf);
-//	snd_output_close(log);
-	snd_config_update_free_global();
-	return EXIT_SUCCESS;
+	if (ret < 0)
+		PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
+	return ret;
 }