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synced 2025-10-29 05:40:27 -04:00
alsa: refactor read and write functions
Separate the sync logic from the read/write functions so that we can use it in the wakeup logic as well.
This commit is contained in:
Wim Taymans
parent
cc1d980f0a
commit
c6745ed0d0
2 changed files with 116 additions and 100 deletions
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@ -2251,32 +2251,33 @@ static inline int check_position_config(struct state *state)
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return 0;
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}
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int spa_alsa_write(struct state *state)
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static int alsa_write_sync(struct state *state, uint64_t current_time)
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{
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snd_pcm_t *hndl = state->hndl;
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const snd_pcm_channel_area_t *my_areas;
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snd_pcm_uframes_t written, frames, offset, off, to_write, total_written, max_write;
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snd_pcm_sframes_t commitres;
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int res, suppressed;
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size_t frame_size = state->frame_size;
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snd_pcm_uframes_t avail, delay, target;
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bool following = state->following;
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if (!state->alsa_started)
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return 0;
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if ((res = check_position_config(state)) < 0)
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return res;
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max_write = state->buffer_frames;
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if (SPA_UNLIKELY((res = get_status(state, current_time, &avail, &delay, &target)) < 0))
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return res;
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if (state->following && state->alsa_started) {
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uint64_t current_time;
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snd_pcm_uframes_t avail, delay, target;
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current_time = state->position->clock.nsec;
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if (SPA_UNLIKELY((res = get_status(state, current_time, &avail, &delay, &target)) < 0))
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return res;
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if (SPA_UNLIKELY((res = update_time(state, current_time, delay, target, true)) < 0))
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return res;
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if (SPA_UNLIKELY(!following && delay > target + state->max_error)) {
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spa_log_trace(state->log, "%p: early wakeup %ld %lu %lu", state,
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avail, delay, target);
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if (delay > target * 3)
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delay = target * 3;
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state->next_time = current_time + (delay - target) * SPA_NSEC_PER_SEC / state->rate;
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return -EAGAIN;
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}
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if (SPA_UNLIKELY((res = update_time(state, current_time, delay, target, following)) < 0))
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return res;
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if (following) {
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if (SPA_UNLIKELY(state->alsa_sync)) {
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enum spa_log_level lev;
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@ -2301,11 +2302,22 @@ int spa_alsa_write(struct state *state)
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} else
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state->alsa_sync_warning = true;
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}
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return 0;
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}
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static int alsa_write_frames(struct state *state)
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{
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snd_pcm_t *hndl = state->hndl;
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const snd_pcm_channel_area_t *my_areas;
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snd_pcm_uframes_t written, frames, offset, off, to_write, total_written;
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snd_pcm_sframes_t commitres;
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int res = 0;
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size_t frame_size = state->frame_size;
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total_written = 0;
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again:
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frames = max_write;
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frames = state->buffer_frames;
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if (state->use_mmap && frames > 0) {
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if (SPA_UNLIKELY((res = snd_pcm_mmap_begin(hndl, &my_areas, &offset, &frames)) < 0)) {
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spa_log_error(state->log, "%s: snd_pcm_mmap_begin error: %s",
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@ -2405,6 +2417,19 @@ again:
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return 0;
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}
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int spa_alsa_write(struct state *state)
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{
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int res = 0;
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if (state->following) {
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uint64_t current_time = state->position->clock.nsec;
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if ((res = alsa_write_sync(state, current_time)) < 0)
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return res;
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}
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if ((res = alsa_write_frames(state)) < 0)
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return res;
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return 0;
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}
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void spa_alsa_recycle_buffer(struct state *this, uint32_t buffer_id)
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{
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struct buffer *b = &this->buffers[buffer_id];
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@ -2488,32 +2513,34 @@ push_frames(struct state *state,
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}
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int spa_alsa_read(struct state *state)
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static int alsa_read_sync(struct state *state, uint64_t current_time)
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{
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snd_pcm_t *hndl = state->hndl;
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snd_pcm_uframes_t total_read = 0, to_read, max_read;
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const snd_pcm_channel_area_t *my_areas;
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snd_pcm_uframes_t read, frames, offset;
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snd_pcm_sframes_t commitres;
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int res, suppressed;
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snd_pcm_uframes_t avail, delay, target, max_read;
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bool following = state->following;
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if (!state->alsa_started)
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return 0;
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if ((res = check_position_config(state)) < 0)
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return res;
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if ((res = get_status(state, current_time, &avail, &delay, &target)) < 0)
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return res;
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if (SPA_UNLIKELY(!following && avail < state->read_size)) {
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spa_log_trace(state->log, "%p: early wakeup %ld %ld %ld %d", state,
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delay, avail, target, state->read_size);
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state->next_time = current_time + (state->read_size - avail) * SPA_NSEC_PER_SEC /
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state->rate;
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return -EAGAIN;
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}
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if (SPA_UNLIKELY((res = update_time(state, current_time, delay, target, following)) < 0))
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return res;
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max_read = state->buffer_frames;
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if (state->following && state->alsa_started) {
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uint64_t current_time;
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snd_pcm_uframes_t avail, delay, target;
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current_time = state->position->clock.nsec;
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if ((res = get_status(state, current_time, &avail, &delay, &target)) < 0)
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return res;
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if (SPA_UNLIKELY((res = update_time(state, current_time, delay, target, true)) < 0))
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return res;
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if (following) {
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if (state->alsa_sync) {
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enum spa_log_level lev;
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@ -2541,8 +2568,20 @@ int spa_alsa_read(struct state *state)
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if (avail < state->read_size)
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max_read = 0;
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}
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state->max_read = SPA_MIN(max_read, state->read_size);
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return 0;
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}
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frames = SPA_MIN(max_read, state->read_size);
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static int alsa_read_frames(struct state *state)
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{
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snd_pcm_t *hndl = state->hndl;
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snd_pcm_uframes_t total_read = 0, to_read;
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const snd_pcm_channel_area_t *my_areas;
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snd_pcm_uframes_t read, frames, offset;
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snd_pcm_sframes_t commitres;
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int res = 0;
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frames = state->max_read;
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if (state->use_mmap) {
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to_read = state->buffer_frames;
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@ -2588,6 +2627,19 @@ int spa_alsa_read(struct state *state)
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return 0;
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}
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int spa_alsa_read(struct state *state)
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{
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int res;
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if (state->following) {
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uint64_t current_time = state->position->clock.nsec;
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if ((res = alsa_read_sync(state, current_time)) < 0)
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return res;
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}
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if ((res = alsa_read_frames(state)) < 0)
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return res;
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return 0;
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}
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int spa_alsa_skip(struct state *state)
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{
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struct buffer *b;
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@ -2622,23 +2674,9 @@ int spa_alsa_skip(struct state *state)
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}
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static int handle_play(struct state *state, uint64_t current_time, snd_pcm_uframes_t avail,
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snd_pcm_uframes_t delay, snd_pcm_uframes_t target)
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static int playback_ready(struct state *state)
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{
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struct spa_io_buffers *io = state->io;
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int res;
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if (state->alsa_started && SPA_UNLIKELY(delay > target + state->max_error)) {
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spa_log_trace(state->log, "%p: early wakeup %ld %lu %lu", state,
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avail, delay, target);
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if (delay > target * 3)
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delay = target * 3;
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state->next_time = current_time + (delay - target) * SPA_NSEC_PER_SEC / state->rate;
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return -EAGAIN;
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}
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if (SPA_UNLIKELY((res = update_time(state, current_time, delay, target, false)) < 0))
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return res;
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spa_log_trace_fp(state->log, "%p: %d", state, io->status);
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@ -2648,26 +2686,10 @@ static int handle_play(struct state *state, uint64_t current_time, snd_pcm_ufram
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return spa_node_call_ready(&state->callbacks, SPA_STATUS_NEED_DATA);
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}
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static int handle_capture(struct state *state, uint64_t current_time, snd_pcm_uframes_t avail,
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snd_pcm_uframes_t delay, snd_pcm_uframes_t target)
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static int capture_ready(struct state *state)
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{
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int res;
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struct spa_io_buffers *io;
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if (SPA_UNLIKELY(avail < state->read_size)) {
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spa_log_trace(state->log, "%p: early wakeup %ld %ld %ld %d", state,
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delay, avail, target, state->read_size);
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state->next_time = current_time + (state->read_size - avail) * SPA_NSEC_PER_SEC /
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state->rate;
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return -EAGAIN;
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}
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if (SPA_UNLIKELY((res = update_time(state, current_time, delay, target, false)) < 0))
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return res;
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if ((res = spa_alsa_read(state)) < 0)
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return res;
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if (spa_list_is_empty(&state->ready))
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return 0;
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@ -2702,7 +2724,6 @@ static uint64_t get_time_ns(struct state *state)
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static void alsa_wakeup_event(struct spa_source *source)
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{
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struct state *state = source->data;
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snd_pcm_uframes_t avail, delay, target;
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uint64_t expire, current_time;
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int res, suppressed;
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@ -2746,42 +2767,36 @@ static void alsa_wakeup_event(struct spa_source *source)
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current_time = state->next_time;
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}
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if (SPA_UNLIKELY((res = check_position_config(state)) < 0)) {
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spa_log_warn(state->log, "%p: error invalid position: %s",
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state, spa_strerror(res));
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return;
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}
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if (SPA_UNLIKELY(get_status(state, current_time, &avail, &delay, &target) < 0)) {
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spa_log_error(state->log, "get_status error");
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state->next_time += state->threshold * 1e9 / state->rate;
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goto done;
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}
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#ifndef FASTPATH
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if (SPA_UNLIKELY(spa_log_level_topic_enabled(state->log, SPA_LOG_TOPIC_DEFAULT, SPA_LOG_LEVEL_TRACE))) {
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uint64_t nsec = get_time_ns(state);
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spa_log_trace_fp(state->log, "%p: wakeup %lu %lu %lu %"PRIu64" %"PRIu64" %"PRIi64
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" %d %"PRIi64, state, avail, delay, target, nsec, nsec,
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nsec - current_time, state->threshold, state->sample_count);
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}
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#endif
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if (state->stream == SND_PCM_STREAM_PLAYBACK)
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handle_play(state, current_time, avail, delay, target);
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/* first do all the sync */
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if (state->stream == SND_PCM_STREAM_CAPTURE)
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res = alsa_read_sync(state, current_time);
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else
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handle_capture(state, current_time, avail, delay, target);
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res = alsa_write_sync(state, current_time);
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/* we can get -EAGAIN when we need to wait some more */
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if (res == -EAGAIN)
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goto done;
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/* then read all sources, the sinks will be written to when the
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* graph completes. */
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if (state->stream == SND_PCM_STREAM_CAPTURE)
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alsa_read_frames(state);
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/* and then trigger the graph */
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if (state->stream == SND_PCM_STREAM_PLAYBACK)
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playback_ready(state);
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else
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capture_ready(state);
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done:
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if (!state->disable_tsched) {
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if (state->next_time > current_time + SPA_NSEC_PER_SEC ||
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current_time > state->next_time + SPA_NSEC_PER_SEC) {
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if ((suppressed = spa_ratelimit_test(&state->rate_limit, current_time)) >= 0) {
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spa_log_error(state->log, "%s: impossible timeout %lu %lu %lu %"
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spa_log_error(state->log, "%s: impossible timeout %"
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PRIu64" %"PRIu64" %"PRIi64" %d %"PRIi64" (%d suppressed)",
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state->name, avail, delay, target,
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current_time, state->next_time, state->next_time - current_time,
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state->threshold, state->sample_count, suppressed);
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state->name, current_time, state->next_time,
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state->next_time - current_time, state->threshold,
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state->sample_count, suppressed);
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}
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state->next_time = current_time + state->threshold * 1e9 / state->rate;
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}
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@ -147,6 +147,7 @@ struct state {
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uint32_t rate_denom;
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uint32_t delay;
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uint32_t read_size;
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uint32_t max_read;
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uint64_t port_info_all;
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struct spa_port_info port_info;
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