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alsa: keep track of input and output latency

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track and report both input and output latency.
This commit is contained in:
Wim Taymans 2021-06-24 09:43:58 +02:00
parent ed9560fb03
commit 8cf5927e95
5 changed files with 49 additions and 13 deletions
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2
spa/include/spa/param/latency-utils.h
View file

@ -44,7 +44,7 @@ struct spa_latency_info {
uint64_t max_ns;
};
#define SPA_LATENCY_INFO(dir) (struct spa_latency_info) { .direction = (dir) }
#define SPA_LATENCY_INFO(dir,...) (struct spa_latency_info) { .direction = (dir), ## __VA_ARGS__ }
static inline int
spa_latency_info_compare(const struct spa_latency_info *a, struct spa_latency_info *b)

27
spa/plugins/alsa/alsa-pcm-sink.c
View file

@ -459,7 +459,10 @@ impl_node_port_enum_params(void *object, int seq,
case SPA_PARAM_Latency:
switch (result.index) {
case 0:
param = spa_latency_build(&b, id, &this->latency);
param = spa_latency_build(&b, id, &this->latency[SPA_DIRECTION_INPUT]);
break;
case 1:
param = spa_latency_build(&b, id, &this->latency[SPA_DIRECTION_OUTPUT]);
break;
default:
return 0;
@ -564,8 +567,19 @@ impl_node_port_set_param(void *object,
res = port_set_format(this, direction, port_id, flags, param);
break;
case SPA_PARAM_Latency:
res = 0;
{
struct spa_latency_info info;
if ((res = spa_latency_parse(param, &info)) < 0)
return res;
if (direction == info.direction)
return -EINVAL;
this->latency[info.direction] = info;
this->port_info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
this->port_params[IDX_Latency].flags ^= SPA_PARAM_INFO_SERIAL;
emit_port_info(this, false);
break;
}
default:
res = -ENOENT;
break;
@ -779,9 +793,12 @@ impl_init(const struct spa_handle_factory *factory,
spa_hook_list_init(&this->hooks);
this->stream = SND_PCM_STREAM_PLAYBACK;
this->latency = SPA_LATENCY_INFO(SPA_DIRECTION_INPUT);
this->latency.min_quantum = 1.0f;
this->latency.max_quantum = 1.0f;
this->port_direction = SPA_DIRECTION_INPUT;
this->latency[this->port_direction] = SPA_LATENCY_INFO(
this->port_direction,
.min_quantum = 1.0f,
.max_quantum = 1.0f);
this->latency[SPA_DIRECTION_OUTPUT] = SPA_LATENCY_INFO(SPA_DIRECTION_OUTPUT);
this->info_all = SPA_NODE_CHANGE_MASK_FLAGS |
SPA_NODE_CHANGE_MASK_PROPS |

27
spa/plugins/alsa/alsa-pcm-source.c
View file

@ -457,7 +457,10 @@ impl_node_port_enum_params(void *object, int seq,
case SPA_PARAM_Latency:
switch (result.index) {
case 0:
param = spa_latency_build(&b, id, &this->latency);
param = spa_latency_build(&b, id, &this->latency[SPA_DIRECTION_INPUT]);
break;
case 1:
param = spa_latency_build(&b, id, &this->latency[SPA_DIRECTION_OUTPUT]);
break;
default:
return 0;
@ -561,8 +564,19 @@ impl_node_port_set_param(void *object,
res = port_set_format(this, direction, port_id, flags, param);
break;
case SPA_PARAM_Latency:
res = 0;
{
struct spa_latency_info info;
if ((res = spa_latency_parse(param, &info)) < 0)
return res;
if (direction == info.direction)
return -EINVAL;
this->latency[info.direction] = info;
this->port_info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
this->port_params[IDX_Latency].flags ^= SPA_PARAM_INFO_SERIAL;
emit_port_info(this, false);
break;
}
default:
res = -ENOENT;
break;
@ -792,9 +806,12 @@ impl_init(const struct spa_handle_factory *factory,
spa_hook_list_init(&this->hooks);
this->stream = SND_PCM_STREAM_CAPTURE;
this->latency = SPA_LATENCY_INFO(SPA_DIRECTION_OUTPUT);
this->latency.min_quantum = 1.0f;
this->latency.max_quantum = 1.0f;
this->port_direction = SPA_DIRECTION_OUTPUT;
this->latency[this->port_direction] = SPA_LATENCY_INFO(
this->port_direction,
.min_quantum = 1.0f,
.max_quantum = 1.0f);
this->latency[SPA_DIRECTION_INPUT] = SPA_LATENCY_INFO(SPA_DIRECTION_INPUT);
this->info_all = SPA_NODE_CHANGE_MASK_FLAGS |
SPA_NODE_CHANGE_MASK_PROPS |

3
spa/plugins/alsa/alsa-pcm.c
View file

@ -682,7 +682,8 @@ int spa_alsa_set_format(struct state *state, struct spa_audio_info *fmt, uint32_
state->headroom = SPA_MIN(state->headroom, state->buffer_frames);
state->start_delay = state->default_start_delay;
state->latency.min_rate = state->latency.max_rate = state->headroom;
state->latency[state->port_direction].min_rate = state->headroom;
state->latency[state->port_direction].max_rate = state->headroom;
state->period_frames = period_size;
periods = state->buffer_frames / state->period_frames;

3
spa/plugins/alsa/alsa-pcm.h
View file

@ -149,6 +149,7 @@ struct state {
#define IDX_Latency 5
#define N_PORT_PARAMS 6
struct spa_param_info port_params[N_PORT_PARAMS];
enum spa_direction port_direction;
struct spa_io_buffers *io;
struct spa_io_clock *clock;
struct spa_io_position *position;
@ -196,7 +197,7 @@ struct state {
struct spa_dll dll;
double max_error;
struct spa_latency_info latency;
struct spa_latency_info latency[2];
snd_use_case_mgr_t *ucm;
};