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pipewire/spa/plugins/alsa/alsa-utils.c
Wim Taymans 0b508db9fc ringbuffer: simplify the API 
Use absolute indexes that we let wrap around. We can then easily detect
how much we under of overflowed by using serial number arithmetic.
Remove the Areas, we can trivially compute this ourselves, move the
logic in read/write_data.
2017-04-20 11:25:24 +02:00

758 lines
24 KiB
C
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sched.h>
#include <errno.h>
#include <getopt.h>
#include <sys/time.h>
#include <math.h>
#include <limits.h>
#include <sys/timerfd.h>
#include <lib/debug.h>
#include "alsa-utils.h"
#define CHECK(s,msg) if ((err = (s)) < 0) { spa_log_error (state->log, msg ": %s", snd_strerror(err)); return err; }
static int
spa_alsa_open (SpaALSAState *state)
{
int err;
SpaALSAProps *props = &state->props;
if (state->opened)
return 0;
CHECK (snd_output_stdio_attach (&state->output, stderr, 0), "attach failed");
spa_log_info (state->log, "ALSA device open '%s'", props->device);
CHECK (snd_pcm_open (&state->hndl,
props->device,
state->stream,
SND_PCM_NONBLOCK |
SND_PCM_NO_AUTO_RESAMPLE |
SND_PCM_NO_AUTO_CHANNELS |
SND_PCM_NO_AUTO_FORMAT), "open failed");
state->timerfd = timerfd_create (CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK);
state->opened = true;
return 0;
}
int
spa_alsa_close (SpaALSAState *state)
{
int err = 0;
if (!state->opened)
return 0;
spa_log_info (state->log, "Device closing");
CHECK (snd_pcm_close (state->hndl), "close failed");
close (state->timerfd);
state->opened = false;
return err;
}
typedef struct {
off_t format_offset;
snd_pcm_format_t format;
} FormatInfo;
#if __BYTE_ORDER == __BIG_ENDIAN
#define _FORMAT_LE(fmt) offsetof(Type, audio_format. fmt ## _OE)
#define _FORMAT_BE(fmt) offsetof(Type, audio_format. fmt)
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define _FORMAT_LE(fmt) offsetof(Type, audio_format. fmt)
#define _FORMAT_BE(fmt) offsetof(Type, audio_format. fmt ## _OE)
#endif
static const FormatInfo format_info[] =
{
{ offsetof(Type, audio_format.UNKNOWN), SND_PCM_FORMAT_UNKNOWN },
{ offsetof(Type, audio_format.S8), SND_PCM_FORMAT_S8 },
{ offsetof(Type, audio_format.U8), SND_PCM_FORMAT_U8 },
{ _FORMAT_LE (S16), SND_PCM_FORMAT_S16_LE },
{ _FORMAT_BE (S16), SND_PCM_FORMAT_S16_BE },
{ _FORMAT_LE (U16), SND_PCM_FORMAT_U16_LE },
{ _FORMAT_BE (U16), SND_PCM_FORMAT_U16_BE },
{ _FORMAT_LE (S24_32), SND_PCM_FORMAT_S24_LE },
{ _FORMAT_BE (S24_32), SND_PCM_FORMAT_S24_BE },
{ _FORMAT_LE (U24_32), SND_PCM_FORMAT_U24_LE },
{ _FORMAT_BE (U24_32), SND_PCM_FORMAT_U24_BE },
{ _FORMAT_LE (S24), SND_PCM_FORMAT_S24_3LE },
{ _FORMAT_BE (S24), SND_PCM_FORMAT_S24_3BE },
{ _FORMAT_LE (U24), SND_PCM_FORMAT_U24_3LE },
{ _FORMAT_BE (U24), SND_PCM_FORMAT_U24_3BE },
{ _FORMAT_LE (S32), SND_PCM_FORMAT_S32_LE },
{ _FORMAT_BE (S32), SND_PCM_FORMAT_S32_BE },
{ _FORMAT_LE (U32), SND_PCM_FORMAT_U32_LE },
{ _FORMAT_BE (U32), SND_PCM_FORMAT_U32_BE },
{ _FORMAT_LE (F32), SND_PCM_FORMAT_FLOAT_LE },
{ _FORMAT_BE (F32), SND_PCM_FORMAT_FLOAT_BE },
{ _FORMAT_LE (F64), SND_PCM_FORMAT_FLOAT64_LE },
{ _FORMAT_BE (F64), SND_PCM_FORMAT_FLOAT64_BE },
};
static snd_pcm_format_t
spa_alsa_format_to_alsa (Type *map, uint32_t format)
{
int i;
for (i = 0; i < SPA_N_ELEMENTS (format_info); i++) {
uint32_t f = *SPA_MEMBER (map, format_info[i].format_offset, uint32_t);
if (f == format)
return format_info[i].format;
}
return SND_PCM_FORMAT_UNKNOWN;
}
SpaResult
spa_alsa_enum_format (SpaALSAState *state,
SpaFormat **format,
const SpaFormat *filter,
uint32_t index)
{
snd_pcm_t *hndl;
snd_pcm_hw_params_t *params;
snd_pcm_format_mask_t *fmask;
int err, i, j, dir;
unsigned int min, max;
uint8_t buffer[4096];
SpaPODBuilder b = SPA_POD_BUILDER_INIT (buffer, sizeof (buffer));
SpaPODFrame f[2];
SpaPODProp *prop;
SpaFormat *fmt;
SpaResult res;
bool opened;
if (index == 1)
return SPA_RESULT_ENUM_END;
opened = state->opened;
if ((err = spa_alsa_open (state)) < 0)
return SPA_RESULT_ERROR;
hndl = state->hndl;
snd_pcm_hw_params_alloca (&params);
CHECK (snd_pcm_hw_params_any (hndl, params), "Broken configuration: no configurations available");
spa_pod_builder_push_format (&b, &f[0], state->type.format,
state->type.media_type.audio,
state->type.media_subtype.raw);
snd_pcm_format_mask_alloca (&fmask);
snd_pcm_hw_params_get_format_mask (params, fmask);
spa_pod_builder_push_prop (&b, &f[1],
state->type.format_audio.format,
SPA_POD_PROP_RANGE_NONE);
prop = SPA_POD_BUILDER_DEREF (&b, f[1].ref, SpaPODProp);
for (i = 1, j = 0; i < SPA_N_ELEMENTS (format_info); i++) {
const FormatInfo *fi = &format_info[i];
if (snd_pcm_format_mask_test (fmask, fi->format)) {
uint32_t f = *SPA_MEMBER (&state->type, fi->format_offset, uint32_t);
if (j++ == 0)
spa_pod_builder_id (&b, f);
spa_pod_builder_id (&b, f);
}
}
if (j > 1)
prop->body.flags |= SPA_POD_PROP_RANGE_ENUM | SPA_POD_PROP_FLAG_UNSET;
spa_pod_builder_pop (&b, &f[1]);
CHECK (snd_pcm_hw_params_get_rate_min (params, &min, &dir), "get_rate_min");
CHECK (snd_pcm_hw_params_get_rate_max (params, &max, &dir), "get_rate_max");
spa_pod_builder_push_prop (&b, &f[1],
state->type.format_audio.rate,
SPA_POD_PROP_RANGE_NONE);
prop = SPA_POD_BUILDER_DEREF (&b, f[1].ref, SpaPODProp);
spa_pod_builder_int (&b, SPA_CLAMP (44100, min, max));
if (min != max) {
spa_pod_builder_int (&b, min);
spa_pod_builder_int (&b, max);
prop->body.flags |= SPA_POD_PROP_RANGE_MIN_MAX | SPA_POD_PROP_FLAG_UNSET;
}
spa_pod_builder_pop (&b, &f[1]);
CHECK (snd_pcm_hw_params_get_channels_min (params, &min), "get_channels_min");
CHECK (snd_pcm_hw_params_get_channels_max (params, &max), "get_channels_max");
spa_pod_builder_push_prop (&b, &f[1],
state->type.format_audio.channels,
SPA_POD_PROP_RANGE_NONE);
prop = SPA_POD_BUILDER_DEREF (&b, f[1].ref, SpaPODProp);
spa_pod_builder_int (&b, SPA_CLAMP (2, min, max));
if (min != max) {
spa_pod_builder_int (&b, min);
spa_pod_builder_int (&b, max);
prop->body.flags |= SPA_POD_PROP_RANGE_MIN_MAX | SPA_POD_PROP_FLAG_UNSET;
}
spa_pod_builder_pop (&b, &f[1]);
spa_pod_builder_pop (&b, &f[0]);
fmt = SPA_POD_BUILDER_DEREF (&b, f[0].ref, SpaFormat);
spa_pod_builder_init (&b, state->format_buffer, sizeof (state->format_buffer));
if ((res = spa_format_filter (fmt, filter, &b)) < 0)
return res;
*format = SPA_POD_BUILDER_DEREF (&b, 0, SpaFormat);
if (!opened)
spa_alsa_close (state);
return SPA_RESULT_OK;
}
int
spa_alsa_set_format (SpaALSAState *state, SpaAudioInfo *fmt, SpaPortFormatFlags flags)
{
unsigned int rrate, rchannels;
snd_pcm_uframes_t period_size;
int err, dir;
snd_pcm_hw_params_t *params;
snd_pcm_format_t format;
SpaAudioInfoRaw *info = &fmt->info.raw;
snd_pcm_t *hndl;
unsigned int periods;
if ((err = spa_alsa_open (state)) < 0)
return err;
hndl = state->hndl;
snd_pcm_hw_params_alloca (&params);
/* choose all parameters */
CHECK (snd_pcm_hw_params_any (hndl, params), "Broken configuration for playback: no configurations available");
/* set hardware resampling */
CHECK (snd_pcm_hw_params_set_rate_resample (hndl, params, 0), "set_rate_resample");
/* set the interleaved read/write format */
CHECK (snd_pcm_hw_params_set_access(hndl, params, SND_PCM_ACCESS_MMAP_INTERLEAVED), "set_access");
/* disable ALSA wakeups, we use a timer */
if (snd_pcm_hw_params_can_disable_period_wakeup (params))
CHECK (snd_pcm_hw_params_set_period_wakeup (hndl, params, 0), "set_period_wakeup");
/* set the sample format */
format = spa_alsa_format_to_alsa (&state->type, info->format);
if (format == SND_PCM_FORMAT_UNKNOWN)
return -EINVAL;
spa_log_info (state->log, "Stream parameters are %iHz, %s, %i channels", info->rate, snd_pcm_format_name(format), info->channels);
CHECK (snd_pcm_hw_params_set_format (hndl, params, format), "set_format");
/* set the count of channels */
rchannels = info->channels;
CHECK (snd_pcm_hw_params_set_channels_near (hndl, params, &rchannels), "set_channels");
if (rchannels != info->channels) {
spa_log_info (state->log, "Channels doesn't match (requested %u, get %u", info->channels, rchannels);
if (flags & SPA_PORT_FORMAT_FLAG_NEAREST)
info->channels = rchannels;
else
return -EINVAL;
}
/* set the stream rate */
rrate = info->rate;
CHECK (snd_pcm_hw_params_set_rate_near (hndl, params, &rrate, 0), "set_rate_near");
if (rrate != info->rate) {
spa_log_info (state->log, "Rate doesn't match (requested %iHz, get %iHz)", info->rate, rrate);
if (flags & SPA_PORT_FORMAT_FLAG_NEAREST)
info->rate = rrate;
else
return -EINVAL;
}
state->format = format;
state->channels = info->channels;
state->rate = info->rate;
state->frame_size = info->channels * (snd_pcm_format_physical_width (format) / 8);
CHECK (snd_pcm_hw_params_get_buffer_size_max (params, &state->buffer_frames), "get_buffer_size_max");
CHECK (snd_pcm_hw_params_set_buffer_size_near (hndl, params, &state->buffer_frames), "set_buffer_size_near");
dir = 0;
period_size = state->buffer_frames;
CHECK (snd_pcm_hw_params_set_period_size_near (hndl, params, &period_size, &dir), "set_period_size_near");
state->period_frames = period_size;
periods = state->buffer_frames / state->period_frames;
spa_log_info (state->log, "buffer frames %zd, period frames %zd, periods %u, frame_size %zd",
state->buffer_frames, state->period_frames, periods, state->frame_size);
/* write the parameters to device */
CHECK (snd_pcm_hw_params (hndl, params), "set_hw_params");
return 0;
}
static int
set_swparams (SpaALSAState *state)
{
snd_pcm_t *hndl = state->hndl;
int err = 0;
snd_pcm_sw_params_t *params;
snd_pcm_uframes_t boundary;
snd_pcm_sw_params_alloca (&params);
/* get the current params */
CHECK (snd_pcm_sw_params_current (hndl, params), "sw_params_current");
CHECK (snd_pcm_sw_params_set_tstamp_mode (hndl, params, SND_PCM_TSTAMP_ENABLE), "sw_params_set_tstamp_mode");
/* start the transfer */
CHECK (snd_pcm_sw_params_set_start_threshold (hndl, params, LONG_MAX), "set_start_threshold");
CHECK (snd_pcm_sw_params_get_boundary (params, &boundary), "get_boundary");
CHECK (snd_pcm_sw_params_set_stop_threshold (hndl, params, boundary), "set_stop_threshold");
CHECK (snd_pcm_sw_params_set_period_event (hndl, params, 0), "set_period_event");
/* write the parameters to the playback device */
CHECK (snd_pcm_sw_params (hndl, params), "sw_params");
return 0;
}
static snd_pcm_uframes_t
pull_frames_queue (SpaALSAState *state,
const snd_pcm_channel_area_t *my_areas,
snd_pcm_uframes_t offset,
snd_pcm_uframes_t frames)
{
snd_pcm_uframes_t total_frames = 0, to_write = frames;
SpaPortIO *io = state->io;
if (spa_list_is_empty (&state->ready)) {
SpaEvent event = SPA_EVENT_INIT (state->type.event_node.NeedInput);
io->status = SPA_RESULT_NEED_INPUT;
io->range.offset = state->sample_count * state->frame_size;
io->range.min_size = state->threshold * state->frame_size;
io->range.max_size = frames * state->frame_size;
state->event_cb (&state->node, &event, state->user_data);
}
while (!spa_list_is_empty (&state->ready) && to_write > 0) {
uint8_t *src, *dst;
size_t n_bytes, n_frames, size;
off_t offs;
SpaALSABuffer *b;
b = spa_list_first (&state->ready, SpaALSABuffer, link);
offs = SPA_MIN (b->outbuf->datas[0].chunk->offset, b->outbuf->datas[0].maxsize);
src = SPA_MEMBER (b->outbuf->datas[0].data, offs, uint8_t);
size = SPA_MIN (b->outbuf->datas[0].chunk->size, b->outbuf->datas[0].maxsize - offs);
src = SPA_MEMBER (src, state->ready_offset, uint8_t);
dst = SPA_MEMBER (my_areas[0].addr, offset * state->frame_size, uint8_t);
n_bytes = SPA_MIN (size - state->ready_offset, to_write * state->frame_size);
n_frames = SPA_MIN (to_write, n_bytes / state->frame_size);
memcpy (dst, src, n_bytes);
state->ready_offset += n_bytes;
if (state->ready_offset >= size) {
SpaEventNodeReuseBuffer rb = SPA_EVENT_NODE_REUSE_BUFFER_INIT (state->type.event_node.ReuseBuffer,
0, b->outbuf->id);
spa_list_remove (&b->link);
b->outstanding = true;
state->io->buffer_id = b->outbuf->id;
spa_log_trace (state->log, "alsa-util %p: reuse buffer %u", state, b->outbuf->id);
state->event_cb (&state->node, (SpaEvent *)&rb, state->user_data);
state->ready_offset = 0;
}
total_frames += n_frames;
to_write -= n_frames;
}
if (total_frames == 0) {
total_frames = state->threshold;
spa_log_warn (state->log, "underrun, want %zd frames", total_frames);
snd_pcm_areas_silence (my_areas, offset, state->channels, total_frames, state->format);
}
return total_frames;
}
static snd_pcm_uframes_t
pull_frames_ringbuffer (SpaALSAState *state,
const snd_pcm_channel_area_t *my_areas,
snd_pcm_uframes_t offset,
snd_pcm_uframes_t frames)
{
int32_t avail;
uint32_t index;
size_t size;
SpaALSABuffer *b;
uint8_t *src, *dst;
b = state->ringbuffer;
src = b->outbuf->datas[0].data;
dst = SPA_MEMBER (my_areas[0].addr, offset * state->frame_size, uint8_t);
avail = spa_ringbuffer_get_read_index (&b->rb->ringbuffer, &index);
size = SPA_MIN (avail, frames * state->frame_size);
spa_log_trace (state->log, "%u %d %zd %zd", index, avail, offset, size);
if (size > 0) {
spa_ringbuffer_read_data (&b->rb->ringbuffer,
src,
index & b->rb->ringbuffer.mask,
dst,
size);
spa_ringbuffer_read_advance (&b->rb->ringbuffer, size);
frames = size / state->frame_size;
} else {
spa_log_warn (state->log, "underrun");
snd_pcm_areas_silence (my_areas, offset, state->channels, frames, state->format);
}
b->outstanding = true;
{
SpaEventNodeReuseBuffer rb = SPA_EVENT_NODE_REUSE_BUFFER_INIT (state->type.event_node.ReuseBuffer,
0, b->outbuf->id);
state->event_cb (&state->node, (SpaEvent*)&rb, state->user_data);
}
return frames;
}
static snd_pcm_uframes_t
push_frames_queue (SpaALSAState *state,
const snd_pcm_channel_area_t *my_areas,
snd_pcm_uframes_t offset,
snd_pcm_uframes_t frames)
{
snd_pcm_uframes_t total_frames = 0;
if (spa_list_is_empty (&state->free)) {
spa_log_warn (state->log, "no more buffers");
}
else {
uint8_t *src;
size_t n_bytes;
SpaALSABuffer *b;
SpaData *d;
SpaPortIO *io;
b = spa_list_first (&state->free, SpaALSABuffer, link);
spa_list_remove (&b->link);
if (b->h) {
b->h->seq = state->sample_count;
b->h->pts = state->last_monotonic;
b->h->dts_offset = 0;
}
d = b->outbuf->datas;
total_frames = SPA_MIN (frames, d[0].maxsize / state->frame_size);
src = SPA_MEMBER (my_areas[0].addr, offset * state->frame_size, uint8_t);
n_bytes = total_frames * state->frame_size;
memcpy (d[0].data, src, n_bytes);
d[0].chunk->offset = 0;
d[0].chunk->size = n_bytes;
d[0].chunk->stride = 0;
if ((io = state->io)) {
SpaEvent event = SPA_EVENT_INIT (state->type.event_node.HaveOutput);
b->outstanding = true;
io->buffer_id = b->outbuf->id;
io->status = SPA_RESULT_OK;
state->event_cb (&state->node, &event, state->user_data);
}
}
return total_frames;
}
static snd_pcm_uframes_t
push_frames_ringbuffer (SpaALSAState *state,
const snd_pcm_channel_area_t *my_areas,
snd_pcm_uframes_t offset,
snd_pcm_uframes_t frames)
{
return frames;
}
static int
alsa_try_resume (SpaALSAState *state)
{
int res;
while ((res = snd_pcm_resume (state->hndl)) == -EAGAIN)
usleep (250000);
if (res < 0) {
spa_log_error (state->log, "suspended, failed to resume %s", snd_strerror(res));
res = snd_pcm_prepare (state->hndl);
if (res < 0)
spa_log_error (state->log, "suspended, failed to prepare %s", snd_strerror(res));
}
return res;
}
static inline void
calc_timeout (size_t target,
size_t current,
size_t rate,
snd_htimestamp_t *now,
struct timespec *ts)
{
ts->tv_sec = now->tv_sec;
ts->tv_nsec = now->tv_nsec;
if (target > current)
ts->tv_nsec += (target - current) * SPA_NSEC_PER_SEC / rate;
while (ts->tv_nsec > SPA_NSEC_PER_SEC) {
ts->tv_sec++;
ts->tv_nsec -= SPA_NSEC_PER_SEC;
}
}
static void
alsa_on_playback_timeout_event (SpaSource *source)
{
uint64_t exp;
int res;
SpaALSAState *state = source->data;
snd_pcm_t *hndl = state->hndl;
snd_pcm_sframes_t avail;
struct itimerspec ts;
snd_pcm_uframes_t total_written = 0, filled;
const snd_pcm_channel_area_t *my_areas;
snd_pcm_status_t *status;
snd_htimestamp_t htstamp;
read (state->timerfd, &exp, sizeof (uint64_t));
snd_pcm_status_alloca(&status);
if ((res = snd_pcm_status (hndl, status)) < 0) {
spa_log_error (state->log, "snd_pcm_status error: %s", snd_strerror (res));
return;
}
avail = snd_pcm_status_get_avail (status);
snd_pcm_status_get_htstamp (status, &htstamp);
if (avail > state->buffer_frames)
avail = state->buffer_frames;
filled = state->buffer_frames - avail;
state->last_ticks = state->sample_count - filled;
state->last_monotonic = (int64_t)htstamp.tv_sec * SPA_NSEC_PER_SEC + (int64_t)htstamp.tv_nsec;
if (filled > state->threshold) {
if (snd_pcm_state (hndl) == SND_PCM_STATE_SUSPENDED) {
spa_log_error (state->log, "suspended: try resume");
if ((res = alsa_try_resume (state)) < 0)
return;
}
}
else {
snd_pcm_uframes_t to_write = state->buffer_frames - filled;
while (total_written < to_write) {
snd_pcm_uframes_t written, frames, offset;
frames = to_write - total_written;
if ((res = snd_pcm_mmap_begin (hndl, &my_areas, &offset, &frames)) < 0) {
spa_log_error (state->log, "snd_pcm_mmap_begin error: %s", snd_strerror(res));
return;
}
if (state->ringbuffer)
written = pull_frames_ringbuffer (state, my_areas, offset, frames);
else
written = pull_frames_queue (state, my_areas, offset, frames);
if (written < frames)
to_write = 0;
if ((res = snd_pcm_mmap_commit (hndl, offset, written)) < 0) {
spa_log_error (state->log, "snd_pcm_mmap_commit error: %s", snd_strerror(res));
if (res != -EPIPE && res != -ESTRPIPE)
return;
}
total_written += written;
}
state->sample_count += total_written;
}
if (!state->alsa_started && total_written > 0) {
spa_log_debug (state->log, "snd_pcm_start");
if ((res = snd_pcm_start (state->hndl)) < 0) {
spa_log_error (state->log, "snd_pcm_start: %s", snd_strerror (res));
return;
}
state->alsa_started = true;
}
calc_timeout (total_written + filled, state->threshold, state->rate, &htstamp, &ts.it_value);
spa_log_trace (state->log, "timeout %ld %ld %ld %ld", total_written, filled,
ts.it_value.tv_sec, ts.it_value.tv_nsec);
ts.it_interval.tv_sec = 0;
ts.it_interval.tv_nsec = 0;
timerfd_settime (state->timerfd, TFD_TIMER_ABSTIME, &ts, NULL);
}
static void
alsa_on_capture_timeout_event (SpaSource *source)
{
uint64_t exp;
int res;
SpaALSAState *state = source->data;
snd_pcm_t *hndl = state->hndl;
snd_pcm_sframes_t avail;
snd_pcm_uframes_t total_read = 0;
struct itimerspec ts;
const snd_pcm_channel_area_t *my_areas;
snd_pcm_status_t *status;
snd_htimestamp_t htstamp;
read (state->timerfd, &exp, sizeof (uint64_t));
snd_pcm_status_alloca(&status);
if ((res = snd_pcm_status (hndl, status)) < 0) {
spa_log_error (state->log, "snd_pcm_status error: %s", snd_strerror (res));
return;
}
avail = snd_pcm_status_get_avail (status);
snd_pcm_status_get_htstamp (status, &htstamp);
state->last_ticks = state->sample_count + avail;
state->last_monotonic = (int64_t)htstamp.tv_sec * SPA_NSEC_PER_SEC + (int64_t)htstamp.tv_nsec;
if (avail < state->threshold) {
if (snd_pcm_state (hndl) == SND_PCM_STATE_SUSPENDED) {
spa_log_error (state->log, "suspended: try resume");
if ((res = alsa_try_resume (state)) < 0)
return;
}
} else {
snd_pcm_uframes_t to_read = avail;
while (total_read < to_read) {
snd_pcm_uframes_t read, frames, offset;
frames = to_read - total_read;
if ((res = snd_pcm_mmap_begin (hndl, &my_areas, &offset, &frames)) < 0) {
spa_log_error (state->log, "snd_pcm_mmap_begin error: %s", snd_strerror(res));
return;
}
if (state->ringbuffer)
read = push_frames_ringbuffer (state, my_areas, offset, frames);
else
read = push_frames_queue (state, my_areas, offset, frames);
if (read < to_read)
to_read = 0;
if ((res = snd_pcm_mmap_commit (hndl, offset, read)) < 0) {
spa_log_error (state->log, "snd_pcm_mmap_commit error: %s", snd_strerror(res));
if (res != -EPIPE && res != -ESTRPIPE)
return;
}
total_read += read;
}
state->sample_count += total_read;
}
calc_timeout (state->threshold, avail - total_read, state->rate, &htstamp, &ts.it_value);
spa_log_trace (state->log, "timeout %ld %ld %ld %ld", total_read, avail,
ts.it_value.tv_sec, ts.it_value.tv_nsec);
ts.it_interval.tv_sec = 0;
ts.it_interval.tv_nsec = 0;
timerfd_settime (state->timerfd, TFD_TIMER_ABSTIME, &ts, NULL);
}
SpaResult
spa_alsa_start (SpaALSAState *state, bool xrun_recover)
{
int err;
if (state->started)
return SPA_RESULT_OK;
spa_log_trace (state->log, "alsa %p: start", state);
CHECK (set_swparams (state), "swparams");
if (!xrun_recover)
snd_pcm_dump (state->hndl, state->output);
if ((err = snd_pcm_prepare (state->hndl)) < 0) {
spa_log_error (state->log, "snd_pcm_prepare error: %s", snd_strerror (err));
return SPA_RESULT_ERROR;
}
if (state->stream == SND_PCM_STREAM_PLAYBACK) {
state->source.func = alsa_on_playback_timeout_event;
} else {
state->source.func = alsa_on_capture_timeout_event;
}
state->source.data = state;
state->source.fd = state->timerfd;
state->source.mask = SPA_IO_IN;
state->source.rmask = 0;
spa_loop_add_source (state->data_loop, &state->source);
state->threshold = state->props.min_latency;
if (state->stream == SND_PCM_STREAM_PLAYBACK) {
state->alsa_started = false;
} else {
if ((err = snd_pcm_start (state->hndl)) < 0) {
spa_log_error (state->log, "snd_pcm_start: %s", snd_strerror (err));
return SPA_RESULT_ERROR;
}
state->alsa_started = true;
}
state->source.func (&state->source);
state->started = true;
return SPA_RESULT_OK;
}
SpaResult
spa_alsa_pause (SpaALSAState *state, bool xrun_recover)
{
int err;
if (!state->started)
return SPA_RESULT_OK;
spa_log_trace (state->log, "alsa %p: pause", state);
spa_loop_remove_source (state->data_loop, &state->source);
if ((err = snd_pcm_drop (state->hndl)) < 0)
spa_log_error (state->log, "snd_pcm_drop %s", snd_strerror (err));
state->started = false;
return SPA_RESULT_OK;
}
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