/*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2010 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
#include <sys/types.h>
#include <dirent.h>
#include <alsa/asoundlib.h>
+#include <sys/time.h>
+#include <stdbool.h>
#include "para.h"
#include "fd.h"
#include "list.h"
#include "sched.h"
#include "ggo.h"
+#include "buffer_tree.h"
#include "write.h"
+#include "write_common.h"
#include "alsa_write.cmdline.h"
#include "error.h"
/** The approximate maximum buffer duration in us. */
unsigned buffer_time;
/* Number of frames that fit into the buffer. */
- unsigned buffer_frames;
+ snd_pcm_uframes_t buffer_frames;
/**
* The samplerate given by command line option or the decoder
* of the writer node group.
* decoder of the writer node group.
*/
unsigned channels;
+ struct timeval drain_barrier;
};
/* Install PCM software and hardware configuration. */
{
snd_pcm_hw_params_t *hwparams;
snd_pcm_sw_params_t *swparams;
- snd_pcm_uframes_t buffer_size, start_threshold, stop_threshold;
+ snd_pcm_uframes_t start_threshold, stop_threshold;
snd_pcm_uframes_t period_size;
int err;
+ PARA_INFO_LOG("opening %s\n", conf->device_arg);
err = snd_pcm_open(&pad->handle, conf->device_arg,
SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
if (err < 0)
if (snd_pcm_hw_params(pad->handle, hwparams) < 0)
return -E_HW_PARAMS;
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,
+ snd_pcm_hw_params_get_buffer_size(hwparams, &pad->buffer_frames);
+ PARA_INFO_LOG("buffer size: %lu, period_size: %lu\n", pad->buffer_frames,
period_size);
- if (period_size == buffer_size)
+ if (period_size == pad->buffer_frames)
return -E_BAD_PERIOD;
snd_pcm_sw_params_current(pad->handle, swparams);
snd_pcm_sw_params_set_avail_min(pad->handle, swparams, period_size);
- if (buffer_size < 1)
+ if (pad->buffer_frames < 1)
start_threshold = 1;
else
- start_threshold = PARA_MIN(buffer_size,
+ start_threshold = PARA_MIN(pad->buffer_frames,
(snd_pcm_uframes_t)pad->samplerate);
if (snd_pcm_sw_params_set_start_threshold(pad->handle, swparams,
start_threshold) < 0)
return -E_START_THRESHOLD;
- stop_threshold = buffer_size;
+ stop_threshold = pad->buffer_frames;
if (snd_pcm_sw_params_set_stop_threshold(pad->handle, swparams,
stop_threshold) < 0)
return -E_STOP_THRESHOLD;
PARA_INFO_LOG("bytes per frame: %d\n", pad->bytes_per_frame);
if (snd_pcm_nonblock(pad->handle, 1))
PARA_ERROR_LOG("failed to set nonblock mode\n");
- pad->buffer_frames = 1000 * pad->buffer_time / pad->samplerate;
- PARA_INFO_LOG("max buffered frames: %d\n", pad->buffer_frames);
return 1;
}
/* Open an instance of the alsa writer. */
static int alsa_open(struct writer_node *wn)
{
- struct alsa_write_args_info *conf = wn->conf;
- struct writer_node_group *wng = wn->wng;
- struct private_alsa_write_data *pad = para_calloc(sizeof(*pad));
-
- wn->private_data = pad;
- 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);
+ wn->private_data = para_calloc(sizeof(struct private_alsa_write_data));
return 1;
}
-static int alsa_write_pre_select(struct sched *s, struct writer_node *wn)
+static void alsa_write_pre_select(struct sched *s, struct task *t)
{
+ struct writer_node *wn = container_of(t, struct writer_node, task);
struct private_alsa_write_data *pad = wn->private_data;
- struct writer_node_group *wng = wn->wng;
struct timeval tv;
snd_pcm_sframes_t avail, underrun;
+ int ret;
if (!pad->handle)
- return 1;
- if (*wng->loaded - wn->written < pad->bytes_per_frame)
- return 1;
+ return;
+ ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
+ if (ret < 0)
+ sched_request_timeout_ms(20, s);
+ if (ret <= 0)
+ return;
/*
* Data is available to be written to the alsa handle. Compute number
* of milliseconds until next buffer underrun would occur.
ms2tv(underrun, &tv);
if (tv_diff(&s->timeout, &tv, NULL) > 0)
s->timeout = tv;
- return 1;
-}
-
-static int alsa_write_post_select(__a_unused struct sched *s,
- struct writer_node *wn)
-{
- struct private_alsa_write_data *pad = wn->private_data;
- struct writer_node_group *wng = wn->wng;
- size_t bytes = *wng->loaded - wn->written;
- unsigned char *data = (unsigned char*)*wng->bufp + wn->written;
- snd_pcm_sframes_t ret, frames, avail;
-
- if (*wng->input_error < 0 && (!pad->handle || bytes < pad->bytes_per_frame)) {
- wn->written = *wng->loaded;
- return *wng->input_error;
- }
- if (!bytes) /* no data available */
- return 0;
- if (!pad->handle) {
- int err = alsa_init(pad, wn->conf);
- if (err < 0)
- return err;
- }
- frames = bytes / pad->bytes_per_frame;
- if (!frames) /* less than a single frame available */
- return 0;
- avail = snd_pcm_avail_update(pad->handle);
- if (avail <= 0)
- return 0;
- frames = PARA_MIN(frames, avail);
- ret = snd_pcm_writei(pad->handle, data, frames);
- if (ret >= 0) {
- wn->written += ret * pad->bytes_per_frame;
- return 1;
- }
- PARA_WARNING_LOG("%s\n", snd_strerror(-ret));
- if (ret == -EPIPE) {
- snd_pcm_prepare(pad->handle);
- return 0;
- }
- if (ret == -EAGAIN)
- return 0;
- return -E_ALSA_WRITE;
}
static void alsa_close(struct writer_node *wn)
PARA_INFO_LOG("closing writer node %p\n", wn);
if (pad->handle) {
+ /*
+ * 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);
}
+static void alsa_write_post_select(__a_unused struct sched *s,
+ struct task *t)
+{
+ struct writer_node *wn = container_of(t, struct writer_node, task);
+ 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;
+
+again:
+ t->error = 0;
+ ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
+ if (ret == 0)
+ return;
+ btr_merge(btrn, wn->min_iqs);
+ bytes = btr_next_buffer(btrn, &data);
+ if (ret < 0 || bytes < pad->bytes_per_frame) { /* eof */
+ assert(btr_no_parent(btrn));
+ ret = -E_ALSA_EOF;
+ if (!pad->handle)
+ 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;
+ }
+ if (tv_diff(now, &pad->drain_barrier, NULL) > 0)
+ goto err;
+ return;
+ }
+ if (!pad->handle) {
+ struct alsa_write_args_info *conf = wn->conf;
+ if (bytes == 0) /* no data available */
+ return;
+ /* defaults */
+ pad->samplerate = conf->samplerate_arg;
+ pad->channels = conf->channels_arg;
+ if (!conf->samplerate_given) { /* config option trumps btr_exec */
+ int32_t rate;
+ if (get_btr_samplerate(btrn, &rate) >= 0)
+ pad->samplerate = rate;
+ }
+ if (!conf->channels_given) {
+ int32_t ch;
+ if (get_btr_channels(btrn, &ch) >= 0)
+ pad->channels = ch;
+ }
+ PARA_INFO_LOG("%d channel(s), %dHz\n", pad->channels, pad->samplerate);
+ ret = alsa_init(pad, wn->conf);
+ if (ret < 0)
+ goto err;
+ wn->min_iqs = pad->bytes_per_frame;
+ }
+ frames = bytes / pad->bytes_per_frame;
+ frames = snd_pcm_writei(pad->handle, data, frames);
+ 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;
+ }
+ if (frames == -EAGAIN)
+ return;
+ PARA_WARNING_LOG("%s\n", snd_strerror(-frames));
+ ret = -E_ALSA_WRITE;
+err:
+ assert(ret < 0);
+ btr_remove_node(btrn);
+ t->error = ret;
+}
+
__malloc static void *alsa_parse_config(const char *options)
{
int ret;
return NULL;
}
+static void alsa_free_config(void *conf)
+{
+ alsa_cmdline_parser_free(conf);
+}
+
/**
- * the init function of the alsa writer
+ * The init function of the alsa writer.
*
- * \param w pointer to the writer to initialize
+ * \param w Pointer to the writer to initialize.
*
- * \sa struct writer
+ * \sa struct \ref writer.
*/
void alsa_write_init(struct writer *w)
{
w->post_select = alsa_write_post_select;
w->parse_config = alsa_parse_config;
w->shutdown = NULL; /* nothing to do */
+ w->free_config = alsa_free_config;
w->help = (struct ggo_help) {
.short_help = alsa_write_args_info_help,
.detailed_help = alsa_write_args_info_detailed_help
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