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audio: Reset rate control when adding bytes

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Commit 90320051ea ("spiceaudio: add a pcm_ops buffer_get_free
function") caused to emit messages saying "Resetting rate control"
frequently when the guest generates no frames.

audio_rate_peek_bytes() resets the rate control when frames < 0 ||
frames > 65536 where frames is the rate-limited number of frames.
Resetting when frames < 0 is sensible as the number simply doesn't make
sense.

There is a problem when frames > 65536. It implies the guest stopped
generating frames for a while so it makes sense to reset the rate
control when the guest resumed generating frames. However, the
commit mentioned earlier broke this assumption by letting spiceaudio
call audio_rate_peek_bytes() whether the guest is generating frames or
not.

Reset the rate control in audio_rate_add_bytes(), which is called only
when actually adding frames, according to the previous call to
audio_rate_peek_bytes() to avoid frequent rate control resets even when
the guest generates no frame.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20250317-rate-v1-1-da9df062747c@daynix.com>
This commit is contained in:
Akihiko Odaki 2025-03-17 17:05:29 +09:00 • committed by Marc-André Lureau
parent f6ccfd5d16
commit 2bccabe6df
2 changed files with 9 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

14
audio/audio.c
View file

@ -2283,17 +2283,19 @@ size_t audio_rate_peek_bytes(RateCtl *rate, struct audio_pcm_info *info)
ticks = now - rate->start_ticks;
bytes = muldiv64(ticks, info->bytes_per_second, NANOSECONDS_PER_SECOND);
frames = (bytes - rate->bytes_sent) / info->bytes_per_frame;
if (frames < 0 || frames > 65536) {
AUD_log(NULL, "Resetting rate control (%" PRId64 " frames)\n", frames);
audio_rate_start(rate);
frames = 0;
}
rate->peeked_frames = frames;
return frames * info->bytes_per_frame;
return frames < 0 ? 0 : frames * info->bytes_per_frame;
}
void audio_rate_add_bytes(RateCtl *rate, size_t bytes_used)
{
if (rate->peeked_frames < 0 || rate->peeked_frames > 65536) {
AUD_log(NULL, "Resetting rate control (%" PRId64 " frames)\n",
rate->peeked_frames);
audio_rate_start(rate);
}
rate->bytes_sent += bytes_used;
}

1
audio/audio_int.h
View file

@ -255,6 +255,7 @@ const char *audio_application_name(void);
typedef struct RateCtl {
int64_t start_ticks;
int64_t bytes_sent;
int64_t peeked_frames;
} RateCtl;
void audio_rate_start(RateCtl *rate);