* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*/
-/** \file alsa_writer.c Data specific to the alsa writer */
+/** \file alsa_writer.c paraslash's alsa output plugin */
/*
* Based in parts on aplay.c from the alsa-utils-1.0.8 package,
#include "para.h"
#include "fd.h"
#include "string.h"
+#include "list.h"
+#include "sched.h"
#include "write.h"
#include <alsa/asoundlib.h>
-#include "write.cmdline.h"
+#include "alsa_write.cmdline.h"
#include "error.h"
-extern struct gengetopt_args_info conf;
#define FORMAT SND_PCM_FORMAT_S16_LE
+
+/** data specific to the alsa writer */
struct private_alsa_data {
+ /** 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;
+ unsigned samplerate;
+ unsigned channels;
};
/*
snd_pcm_sw_params_t *swparams;
snd_pcm_uframes_t buffer_size, xfer_align, start_threshold,
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;
+ struct private_alsa_data *pad = para_calloc(sizeof(struct private_alsa_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);
- 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);
+ 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)
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)
+ pad->channels) < 0)
return -E_CHANNEL_COUNT;
if (snd_pcm_hw_params_set_rate_near(pad->handle, hwparams,
- (unsigned int*) &conf.sample_rate_arg, 0) < 0)
+ &pad->samplerate, 0) < 0)
return -E_SET_RATE;
- err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &buffer_time, 0);
- if (err < 0 || !buffer_time)
+ 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_DEBUG_LOG("buffer time: %d\n", buffer_time);
+ PARA_INFO_LOG("buffer time: %d\n", pad->buffer_time);
if (snd_pcm_hw_params_set_buffer_time_near(pad->handle, hwparams,
- &buffer_time, 0) < 0)
+ &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);
snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
- PARA_DEBUG_LOG("buffer size: %lu, period_size: %lu\n", buffer_size,
+ PARA_INFO_LOG("buffer size: %lu, period_size: %lu\n", buffer_size,
period_size);
if (period_size == buffer_size)
return -E_BAD_PERIOD;
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;
+ * pad->channels / 8;
+ if (snd_pcm_nonblock(pad->handle, 1))
+ PARA_ERROR_LOG("%s\n", "failed to set nonblock mode");
return period_size * pad->bytes_per_frame;
}
-/**
- * push out pcm frames
- * \param data pointer do data to be written
- * \param nbytes number of bytes (not frames)
- *
- * \return Number of bytes written, -E_ALSA_WRITE on errors.
- */
-static int alsa_write(char *data, size_t nbytes, struct writer_node *wn)
+static int alsa_write_pre_select(struct sched *s, 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 (frames > 0) {
- /* write interleaved frames */
- 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 < frames))
- snd_pcm_wait(pad->handle, 1);
- else if (r == -EPIPE)
- snd_pcm_prepare(pad->handle);
- else if (r < 0)
- return -E_ALSA_WRITE;
- if (r > 0) {
- result += r;
- frames -= r;
- d += r * pad->bytes_per_frame;
- }
+ 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;
}
- return result * pad->bytes_per_frame;
+ return 1;
+// PARA_INFO_LOG("timeout: %lu\n", tv2ms(&s->timeout));
+}
+
+static int alsa_write_post_select(__a_unused struct sched *s,
+ struct writer_node *wn)
+{
+ struct private_alsa_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_eof)
+ 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("%s", "EPIPE\n");
+ snd_pcm_prepare(pad->handle);
+ return 1;
+ }
+ if (ret < 0) {
+ PARA_WARNING_LOG("%s", "ALSA ERROR\n");
+ return -E_ALSA_WRITE;
+ }
+ ms2tv(pad->buffer_time / 4000, &tv);
+// ms2tv(1, &tv);
+ tv_add(now, &tv, &pad->next_chunk);
+ wn->written += ret * pad->bytes_per_frame;
+ return 1;
}
static void alsa_close(struct writer_node *wn)
{
struct private_alsa_data *pad = wn->private_data;
+ PARA_INFO_LOG("closing writer node %p\n", wn);
snd_pcm_drain(pad->handle);
snd_pcm_close(pad->handle);
snd_config_update_free_global();
free(pad);
}
+__malloc void *alsa_parse_config(char *options)
+{
+ struct alsa_write_args_info *conf
+ = para_calloc(sizeof(struct alsa_write_args_info));
+ PARA_INFO_LOG("options: %s, %d\n", options, strcspn(options, " \t"));
+ int 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 */
void alsa_writer_init(struct writer *w)
{
w->open = alsa_open;
- w->write = alsa_write;
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 */
}
projects / paraslash.git / blobdiff