X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;f=alsa_write.c;h=679962e0e00f276700138bb83517e7fbd7ab8bb7;hb=870fcd0379ab096184f42481541d668694da7c83;hp=ae471679f076f17fbce5b3d8d27ed5458d1fb4cd;hpb=a00bb171f7ca390e3eb9edf8f7c83c32cbaf81ab;p=paraslash.git

diff --git a/alsa_write.c b/alsa_write.c
index ae471679..3935c8c6 100644
--- a/alsa_write.c
+++ b/alsa_write.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -12,242 +12,337 @@
  * based on the vplay program by Michael Beck.
  */
 
+#include <regex.h>
 #include <sys/types.h>
-#include <dirent.h>
 #include <alsa/asoundlib.h>
+#include <lopsub.h>
 
+#include "write_cmd.lsg.h"
 #include "para.h"
 #include "fd.h"
 #include "string.h"
 #include "list.h"
 #include "sched.h"
-#include "ggo.h"
+#include "buffer_tree.h"
 #include "write.h"
-#include "alsa_write.cmdline.h"
 #include "error.h"
 
-/** always use 16 bit little endian */
-#define FORMAT SND_PCM_FORMAT_S16_LE
-
-/** data specific to the alsa writer */
+/** Data specific to the alsa writer. */
 struct private_alsa_write_data {
-	/** the alsa handle */
+	/** The alsa handle */
 	snd_pcm_t *handle;
-	/** determined and set by alsa_open() */
-	size_t bytes_per_frame;
-	/** don't write anything until this time */
-	struct timeval next_chunk;
-	/** the return value of snd_pcm_hw_params_get_buffer_time_max() */
-	unsigned buffer_time;
-	/**
-	 * the samplerate given by command line option or the decoder
-	 * of the writer node group
+	/** Determined and set by alsa_init(). */
+	int bytes_per_frame;
+	/*
+	 * If the sample rate is not given at the command line and no wav
+	 * header was detected, the btr exec mechanism is employed to query the
+	 * ancestor buffer tree nodes for this information. In a typical setup
+	 * the decoder passes the sample rate back to the alsa writer.
+	 *
+	 *  \sa \ref btr_exec_up().
 	 */
-	unsigned samplerate;
-	/**
-	 * the number of channels, also given by command line option or the
-	 * decoder of the writer node group
+	unsigned sample_rate;
+	/*
+	 * The sample format (8/16 bit, signed/unsigned, little/big endian) is
+	 * determined in the same way as the \a sample_rate.
 	 */
+	snd_pcm_format_t sample_format;
+	/* The number of channels, again determined like \a sample_rate. */
 	unsigned channels;
+	/* time until buffer underrun occurs, in milliseconds */
+	unsigned buffer_time;
+	struct timeval drain_barrier;
+	/* File descriptor for select(). */
+	int poll_fd;
 };
 
-/*
- * open and prepare the PCM handle for writing
- *
- * Install PCM software and hardware configuration. Exit on errors.
- */
-static int alsa_open(struct writer_node *w)
+static snd_pcm_format_t get_alsa_pcm_format(enum sample_format sf)
 {
-	snd_pcm_hw_params_t *hwparams;
-	snd_pcm_sw_params_t *swparams;
-	snd_pcm_uframes_t buffer_size, start_threshold, stop_threshold;
-	int err;
-	snd_pcm_info_t *info;
-	snd_pcm_uframes_t period_size;
-	struct private_alsa_write_data *pad = para_calloc(sizeof(struct
-		private_alsa_write_data));
-	struct alsa_write_args_info *conf = w->conf;
-	struct writer_node_group *wng = w->wng;
-
-	if (!conf->samplerate_given && wng->samplerate)
-		pad->samplerate = *wng->samplerate;
-	else
-		pad->samplerate = conf->samplerate_arg;
-	if (!conf->channels_given && wng->channels)
-		pad->channels = *wng->channels;
-	else
-		pad->channels = conf->channels_arg;
-	PARA_INFO_LOG("%d channel(s), %dHz\n", pad->channels, pad->samplerate);
-	w->private_data = pad;
-	snd_pcm_info_alloca(&info);
-	err = snd_pcm_open(&pad->handle, conf->device_arg,
-		SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
-	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(pad->handle, hwparams) < 0)
-		return -E_BROKEN_CONF;
-	if (snd_pcm_hw_params_set_access(pad->handle, hwparams,
-			SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
-		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,
-			pad->channels) < 0)
-		return -E_CHANNEL_COUNT;
-	if (snd_pcm_hw_params_set_rate_near(pad->handle, hwparams,
-			&pad->samplerate, 0) < 0)
-		return -E_SET_RATE;
-	err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &pad->buffer_time, 0);
-	if (err < 0 || !pad->buffer_time)
-		return -E_GET_BUFFER_TIME;
-	PARA_INFO_LOG("buffer time: %d\n", pad->buffer_time);
-	if (snd_pcm_hw_params_set_buffer_time_near(pad->handle, hwparams,
-			&pad->buffer_time, 0) < 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);
+	switch (sf) {
+	case SF_S8: return SND_PCM_FORMAT_S8;
+	case SF_U8: return SND_PCM_FORMAT_U8;
+	case SF_S16_LE: return SND_PCM_FORMAT_S16_LE;
+	case SF_S16_BE: return SND_PCM_FORMAT_S16_BE;
+	case SF_U16_LE: return SND_PCM_FORMAT_U16_LE;
+	case SF_U16_BE: return SND_PCM_FORMAT_U16_BE;
+	default: return SND_PCM_FORMAT_S16_LE;
+	}
+}
+
+/* Install PCM software and hardware configuration. */
+static int alsa_init(struct writer_node *wn)
+{
+	struct private_alsa_write_data *pad = wn->private_data;
+	snd_pcm_hw_params_t *hwparams = NULL;
+	snd_pcm_sw_params_t *swparams = NULL;
+	snd_pcm_uframes_t start_threshold, stop_threshold;
+	snd_pcm_uframes_t buffer_size, period_size;
+	snd_output_t *output_log;
+	int ret;
+	const char *msg, *dev = WRITE_CMD_OPT_STRING_VAL(ALSA, DEVICE, wn->lpr);
+	unsigned period_time;
+
+	PARA_INFO_LOG("opening %s\n", dev);
+	msg = "unable to open pcm";
+	ret = snd_pcm_open(&pad->handle, dev, SND_PCM_STREAM_PLAYBACK,
+		SND_PCM_NONBLOCK);
+	if (ret < 0)
+		goto fail;
+	ret = snd_pcm_hw_params_malloc(&hwparams);
+	assert(ret >= 0);
+	msg = "Broken alsa configuration";
+	ret = snd_pcm_hw_params_any(pad->handle, hwparams);
+	if (ret < 0)
+		goto fail;
+	msg = "access type not available";
+	ret = snd_pcm_hw_params_set_access(pad->handle, hwparams,
+		SND_PCM_ACCESS_RW_INTERLEAVED);
+	if (ret < 0)
+		goto fail;
+	msg = "sample format not available";
+	ret = snd_pcm_hw_params_set_format(pad->handle, hwparams,
+		pad->sample_format);
+	if (ret < 0)
+		goto fail;
+	msg = "channels count not available";
+	ret = snd_pcm_hw_params_set_channels(pad->handle, hwparams,
+		pad->channels);
+	if (ret < 0)
+		goto fail;
+	msg = "could not set sample rate";
+	ret = snd_pcm_hw_params_set_rate_near(pad->handle, hwparams,
+		&pad->sample_rate, NULL);
+	if (ret < 0)
+		goto fail;
+	/* alsa wants microseconds */
+	pad->buffer_time = 1000U * WRITE_CMD_OPT_UINT32_VAL(ALSA, BUFFER_TIME,
+		wn->lpr);
+	msg = "could not set buffer time";
+	ret = snd_pcm_hw_params_set_buffer_time_near(pad->handle, hwparams,
+		&pad->buffer_time, NULL);
+	if (ret < 0)
+		goto fail;
+	pad->buffer_time /= 1000; /* we prefer milliseconds */
+	period_time = pad->buffer_time * 250; /* buffer time / 4 */
+	msg = "could not set period time";
+	ret = snd_pcm_hw_params_set_period_time_near(pad->handle, hwparams,
+		&period_time, NULL);
+	if (ret < 0)
+		goto fail;
+
+	msg = "unable to install hw params";
+	ret = snd_pcm_hw_params(pad->handle, hwparams);
+	if (ret < 0)
+		goto fail;
+	snd_pcm_hw_params_get_period_size(hwparams, &period_size, NULL);
 	snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
-	PARA_INFO_LOG("buffer size: %lu, period_size: %lu\n", buffer_size,
-		period_size);
+	msg = "period size equals buffer size";
 	if (period_size == buffer_size)
-		return -E_BAD_PERIOD;
+		goto fail;
+
+	/* software parameter setup */
+	ret = snd_pcm_sw_params_malloc(&swparams);
+	assert(ret >= 0);
 	snd_pcm_sw_params_current(pad->handle, swparams);
 	snd_pcm_sw_params_set_avail_min(pad->handle, swparams, period_size);
 	if (buffer_size < 1)
 		start_threshold = 1;
 	else
-		start_threshold = buffer_size;
-	if (snd_pcm_sw_params_set_start_threshold(pad->handle, swparams,
-			start_threshold) < 0)
-		return -E_START_THRESHOLD;
+		start_threshold = PARA_MIN(buffer_size,
+			(snd_pcm_uframes_t)pad->sample_rate);
+	msg = "could not set start threshold";
+	ret = snd_pcm_sw_params_set_start_threshold(pad->handle, swparams,
+		start_threshold);
+	if (ret < 0)
+		goto fail;
 	stop_threshold = buffer_size;
-	if (snd_pcm_sw_params_set_stop_threshold(pad->handle, swparams,
-			stop_threshold) < 0)
-		return -E_STOP_THRESHOLD;
-	if (snd_pcm_sw_params(pad->handle, swparams) < 0)
-		return -E_SW_PARAMS;
-	pad->bytes_per_frame = snd_pcm_format_physical_width(FORMAT)
-		* pad->channels / 8;
-	PARA_INFO_LOG("bytes per frame: %zu\n", pad->bytes_per_frame);
-	if (snd_pcm_nonblock(pad->handle, 1))
-		PARA_ERROR_LOG("failed to set nonblock mode\n");
-	return period_size * pad->bytes_per_frame;
-}
-
-static int alsa_write_pre_select(struct sched *s, struct writer_node *wn)
-{
-	struct private_alsa_write_data *pad = wn->private_data;
-	struct writer_node_group *wng = wn->wng;
-	struct timeval diff;
-
-	if (*wng->loaded < pad->bytes_per_frame)
-		return 1;
-	if (tv_diff(now, &pad->next_chunk, &diff) < 0) {
-		if (tv_diff(&s->timeout, &diff, NULL) > 0)
-			s->timeout = diff;
-	} else {
-		s->timeout.tv_sec = 0;
-		s->timeout.tv_usec = 1;
+	msg = "could not set stop threshold";
+	ret = snd_pcm_sw_params_set_stop_threshold(pad->handle, swparams,
+		stop_threshold);
+	if (ret < 0)
+		goto fail;
+	msg = "unable to install sw params";
+	ret = snd_pcm_sw_params(pad->handle, swparams);
+	if (ret < 0)
+		goto fail;
+	msg = "unable to determine bytes per frame";
+	ret = snd_pcm_format_physical_width(pad->sample_format);
+	if (ret <= 0)
+		goto fail;
+	pad->bytes_per_frame = ret * pad->channels / 8;
+	msg = "failed to set alsa handle to nonblock mode";
+	ret = snd_pcm_nonblock(pad->handle, 1);
+	if (ret < 0)
+		goto fail;
+	ret = snd_output_buffer_open(&output_log);
+	if (ret == 0) {
+		char *buf, *p;
+		size_t sz;
+		PARA_DEBUG_LOG("dumping alsa configuration\n");
+		snd_pcm_dump(pad->handle, output_log);
+		snd_pcm_hw_params_dump(hwparams, output_log);
+		sz = snd_output_buffer_string(output_log, &buf);
+		for (p = buf; p < buf + sz;) {
+			char *q = memchr(p, '\n', buf + sz - p);
+			if (!q)
+				break;
+			*q = '\0';
+			PARA_DEBUG_LOG("%s\n", p);
+			p = q + 1;
+		}
+		snd_output_close(output_log);
 	}
-	return 1;
-//	PARA_INFO_LOG("timeout: %lu\n", tv2ms(&s->timeout));
+	ret = 1;
+	goto out;
+fail:
+	if (ret < 0)
+		PARA_ERROR_LOG("%s: %s\n", msg, snd_strerror(-ret));
+	else
+		PARA_ERROR_LOG("%s\n", msg);
+	ret = -E_ALSA;
+out:
+	snd_pcm_hw_params_free(hwparams);
+	snd_pcm_sw_params_free(swparams);
+	return ret;
 }
 
-static int alsa_write_post_select(__a_unused struct sched *s,
-		struct writer_node *wn)
+static void alsa_write_pre_select(struct sched *s, void *context)
 {
+	struct pollfd pfd;
+	struct writer_node *wn = context;
 	struct private_alsa_write_data *pad = wn->private_data;
-	struct writer_node_group *wng = wn->wng;
-	size_t frames = (*wng->loaded - wn->written) / pad->bytes_per_frame;
-	snd_pcm_sframes_t ret;
-	unsigned char *data = (unsigned char*)wng->buf + wn->written;
-	struct timeval tv;
-
-//	PARA_INFO_LOG("%zd frames\n", frames);
-	if (!frames) {
-		if (*wng->input_error)
-			wn->written = *wng->loaded;
-		return 1;
-	}
-	if (tv_diff(now, &pad->next_chunk, NULL) < 0)
-		return 1;
-	ret = snd_pcm_writei(pad->handle, data, frames);
-	if (ret == -EPIPE) {
-		PARA_WARNING_LOG("EPIPE\n");
-		snd_pcm_prepare(pad->handle);
-		return 1;
+	int ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
+
+	if (pad)
+		pad->poll_fd = -1;
+	if (ret == 0)
+		return;
+	if (!pad) {
+		sched_min_delay(s);
+		return;
 	}
-	if (ret < 0 && ret != -EAGAIN) {
-		PARA_WARNING_LOG("alsa error (%zu frames, ret = %d\n",
-			frames, (int)ret);
-		return -E_ALSA_WRITE;
+	if (ret < 0) {
+		sched_request_barrier_or_min_delay(&pad->drain_barrier, s);
+		return;
 	}
-	if (ret == -EAGAIN)
-		PARA_DEBUG_LOG("EAGAIN\n");
-	else
-		wn->written += ret * pad->bytes_per_frame;
-	if (ret == frames) /* we wrote everything, try again immediately */
-		pad->next_chunk	= *now;
-	else {
-		ms2tv(pad->buffer_time / pad->bytes_per_frame / 1000, &tv);
-		tv_add(now, &tv, &pad->next_chunk);
+	/* wait at most 50% of the buffer time */
+	sched_request_timeout_ms(pad->buffer_time / 2, s);
+	ret = snd_pcm_poll_descriptors(pad->handle, &pfd, 1);
+	if (ret < 0) {
+		PARA_ERROR_LOG("could not get alsa poll fd: %s\n",
+			snd_strerror(-ret));
+		return;
 	}
-	return 1;
+	pad->poll_fd = pfd.fd;
+	para_fd_set(pfd.fd, &s->rfds, &s->max_fileno);
 }
 
 static void alsa_close(struct writer_node *wn)
 {
 	struct private_alsa_write_data *pad = wn->private_data;
 	PARA_INFO_LOG("closing writer node %p\n", wn);
+
+	if (!pad)
+		return;
+	/*
+	 * It's OK to have a blocking operation here because we already made
+	 * sure that the PCM output buffer is (nearly) empty.
+	 */
+	snd_pcm_nonblock(pad->handle, 0);
 	snd_pcm_drain(pad->handle);
 	snd_pcm_close(pad->handle);
 	snd_config_update_free_global();
 	free(pad);
 }
 
-__malloc static void *alsa_parse_config(const char *options)
+static int alsa_write_post_select(__a_unused struct sched *s, void *context)
 {
+	struct writer_node *wn = context;
+	struct private_alsa_write_data *pad = wn->private_data;
+	struct btr_node *btrn = wn->btrn;
+	char *data;
+	size_t bytes;
+	snd_pcm_sframes_t frames;
 	int ret;
-	struct alsa_write_args_info *conf
-		= para_calloc(sizeof(struct alsa_write_args_info));
-
-	PARA_INFO_LOG("options: %s, %zd\n", options, strcspn(options, " \t"));
-	ret = alsa_cmdline_parser_string(options, conf, "alsa_write");
-	if (ret)
-		goto err_out;
-	PARA_INFO_LOG("help given: %d\n", conf->help_given);
-	return conf;
-err_out:
-	free(conf);
-	return NULL;
-}
 
-/**
- * the init function of the alsa writer
- *
- * \param w pointer to the writer to initialize
- *
- * \sa struct writer
- */
-void alsa_write_init(struct writer *w)
-{
-	struct alsa_write_args_info dummy;
-
-	alsa_cmdline_parser_init(&dummy);
-	w->open = alsa_open;
-	w->close = alsa_close;
-	w->pre_select = alsa_write_pre_select;
-	w->post_select = alsa_write_post_select;
-	w->parse_config = alsa_parse_config;
-	w->shutdown = NULL; /* nothing to do */
-	w->help = (struct ggo_help) {
-		.short_help = alsa_write_args_info_help,
-		.detailed_help = alsa_write_args_info_detailed_help
-	};
+	ret = task_get_notification(wn->task);
+	if (ret < 0)
+		goto err;
+again:
+	ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
+	if (ret == 0)
+		return 0;
+	btr_merge(btrn, wn->min_iqs);
+	bytes = btr_next_buffer(btrn, &data);
+	if (ret < 0 || bytes < wn->min_iqs) { /* eof */
+		assert(btr_no_parent(btrn));
+		ret = -E_WRITE_COMMON_EOF;
+		if (!pad)
+			goto err;
+		/* wait until pending frames are played */
+		if (pad->drain_barrier.tv_sec == 0) {
+			PARA_DEBUG_LOG("waiting for device to drain\n");
+			tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
+				&pad->drain_barrier);
+			return 0;
+		}
+		if (tv_diff(now, &pad->drain_barrier, NULL) > 0)
+			goto err;
+		return 0;
+	}
+	if (!pad) {
+		int32_t val;
+
+		if (bytes == 0) /* no data available */
+			return 0;
+		pad = wn->private_data = para_calloc(sizeof(*pad));
+		get_btr_sample_rate(btrn, &val);
+		pad->sample_rate = val;
+		get_btr_channels(btrn, &val);
+		pad->channels = val;
+		get_btr_sample_format(btrn, &val);
+		pad->sample_format = get_alsa_pcm_format(val);
+
+		PARA_INFO_LOG("%u channel(s), %uHz\n", pad->channels,
+			pad->sample_rate);
+		ret = alsa_init(wn);
+		if (ret < 0) {
+			free(wn->private_data);
+			wn->private_data = NULL;
+			goto err;
+		}
+		wn->min_iqs = pad->bytes_per_frame;
+		goto again;
+	}
+	frames = bytes / pad->bytes_per_frame;
+	frames = snd_pcm_writei(pad->handle, data, frames);
+	if (frames == 0 || frames == -EAGAIN) {
+		char buf[100];
+		if (pad->poll_fd >= 0 && FD_ISSET(pad->poll_fd, &s->rfds))
+			if (read(pad->poll_fd, buf, 100))
+				do_nothing;
+		return 0;
+	}
+	if (frames > 0) {
+		btr_consume(btrn, frames * pad->bytes_per_frame);
+		goto again;
+	}
+	if (frames == -EPIPE) {
+		PARA_WARNING_LOG("underrun (tried to write %zu bytes)\n", bytes);
+		snd_pcm_prepare(pad->handle);
+		return 0;
+	}
+	PARA_ERROR_LOG("alsa write error: %s\n", snd_strerror(-frames));
+	ret = -E_ALSA;
+err:
+	assert(ret < 0);
+	btr_remove_node(&wn->btrn);
+	return ret;
 }
+
+struct writer lsg_write_cmd_com_alsa_user_data = {
+
+	.pre_select = alsa_write_pre_select,
+	.post_select = alsa_write_post_select,
+	.close = alsa_close,
+};