From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: alsa-devel@alsa-project.org
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Subject: [PATCH v6 4/7] ALSA: core: add .get_time_info
Date: Fri, 13 Feb 2015 15:14:06 -0600 [thread overview]
Message-ID: <1423862049-4073-5-git-send-email-pierre-louis.bossart@linux.intel.com> (raw)
In-Reply-To: <1423862049-4073-1-git-send-email-pierre-louis.bossart@linux.intel.com>
Introduce more generic .get_time_info to retrieve
system timestamp and audio timestamp in single routine.
Backwards compatibility is preserved with same functionality
as with .wall_clock method (to be removed in following commits
to avoid breaking git bisect)
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
include/sound/pcm.h | 4 +++
sound/core/pcm_lib.c | 88 +++++++++++++++++++++++++++++++++----------------
sound/core/pcm_native.c | 24 ++++++++++++++
3 files changed, 87 insertions(+), 29 deletions(-)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 60f0e48..04f2d49 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -76,6 +76,10 @@ struct snd_pcm_ops {
snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
int (*wall_clock)(struct snd_pcm_substream *substream,
struct timespec *audio_ts);
+ int (*get_time_info)(struct snd_pcm_substream *substream,
+ struct timespec *system_ts, struct timespec *audio_ts,
+ struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
+ struct snd_pcm_audio_tstamp_report *audio_tstamp_report);
int (*copy)(struct snd_pcm_substream *substream, int channel,
snd_pcm_uframes_t pos,
void __user *buf, snd_pcm_uframes_t count);
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index ffd6560..ac6b33f 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -232,6 +232,49 @@ int snd_pcm_update_state(struct snd_pcm_substream *substream,
return 0;
}
+static void update_audio_tstamp(struct snd_pcm_substream *substream,
+ struct timespec *curr_tstamp,
+ struct timespec *audio_tstamp)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ u64 audio_frames, audio_nsecs;
+ struct timespec driver_tstamp;
+
+ if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
+ return;
+
+ if (!(substream->ops->get_time_info) ||
+ (runtime->audio_tstamp_report.actual_type ==
+ SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
+
+ /*
+ * provide audio timestamp derived from pointer position
+ * add delay only if requested
+ */
+
+ audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
+
+ if (runtime->audio_tstamp_config.report_delay) {
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ audio_frames -= runtime->delay;
+ else
+ audio_frames += runtime->delay;
+ }
+ audio_nsecs = div_u64(audio_frames * 1000000000LL,
+ runtime->rate);
+ *audio_tstamp = ns_to_timespec(audio_nsecs);
+ }
+ runtime->status->audio_tstamp = *audio_tstamp;
+ runtime->status->tstamp = *curr_tstamp;
+
+ /*
+ * re-take a driver timestamp to let apps detect if the reference tstamp
+ * read by low-level hardware was provided with a delay
+ */
+ snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);
+ runtime->driver_tstamp = driver_tstamp;
+}
+
static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
unsigned int in_interrupt)
{
@@ -256,11 +299,18 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
pos = substream->ops->pointer(substream);
curr_jiffies = jiffies;
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
- snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
-
- if ((runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) &&
- (substream->ops->wall_clock))
- substream->ops->wall_clock(substream, &audio_tstamp);
+ if ((substream->ops->get_time_info) &&
+ (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
+ substream->ops->get_time_info(substream, &curr_tstamp,
+ &audio_tstamp,
+ &runtime->audio_tstamp_config,
+ &runtime->audio_tstamp_report);
+
+ /* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */
+ if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
+ snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
+ } else
+ snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
}
if (pos == SNDRV_PCM_POS_XRUN) {
@@ -403,8 +453,10 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
}
no_delta_check:
- if (runtime->status->hw_ptr == new_hw_ptr)
+ if (runtime->status->hw_ptr == new_hw_ptr) {
+ update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
return 0;
+ }
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
runtime->silence_size > 0)
@@ -426,30 +478,8 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
snd_BUG_ON(crossed_boundary != 1);
runtime->hw_ptr_wrap += runtime->boundary;
}
- if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
- runtime->status->tstamp = curr_tstamp;
- if (!(runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)) {
- /*
- * no wall clock available, provide audio timestamp
- * derived from pointer position+delay
- */
- u64 audio_frames, audio_nsecs;
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- audio_frames = runtime->hw_ptr_wrap
- + runtime->status->hw_ptr
- - runtime->delay;
- else
- audio_frames = runtime->hw_ptr_wrap
- + runtime->status->hw_ptr
- + runtime->delay;
- audio_nsecs = div_u64(audio_frames * 1000000000LL,
- runtime->rate);
- audio_tstamp = ns_to_timespec(audio_nsecs);
- }
- runtime->status->audio_tstamp = audio_tstamp;
- }
+ update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
return snd_pcm_update_state(substream, runtime);
}
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 72323a8..9c2c6f8 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -707,6 +707,23 @@ int snd_pcm_status(struct snd_pcm_substream *substream,
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_stream_lock_irq(substream);
+
+ snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
+ &runtime->audio_tstamp_config);
+
+ /* backwards compatible behavior */
+ if (runtime->audio_tstamp_config.type_requested ==
+ SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
+ if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
+ runtime->audio_tstamp_config.type_requested =
+ SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
+ else
+ runtime->audio_tstamp_config.type_requested =
+ SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
+ runtime->audio_tstamp_report.valid = 0;
+ } else
+ runtime->audio_tstamp_report.valid = 1;
+
status->state = runtime->status->state;
status->suspended_state = runtime->status->suspended_state;
if (status->state == SNDRV_PCM_STATE_OPEN)
@@ -716,8 +733,15 @@ int snd_pcm_status(struct snd_pcm_substream *substream,
snd_pcm_update_hw_ptr(substream);
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
status->tstamp = runtime->status->tstamp;
+ status->driver_tstamp = runtime->driver_tstamp;
status->audio_tstamp =
runtime->status->audio_tstamp;
+ if (runtime->audio_tstamp_report.valid == 1)
+ /* backwards compatibility, no report provided in COMPAT mode */
+ snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
+ &status->audio_tstamp_accuracy,
+ &runtime->audio_tstamp_report);
+
goto _tstamp_end;
}
} else {
--
1.9.1
next prev parent reply other threads:[~2015-02-13 21:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-13 21:14 [PATCH v6 0/7] audio timestamping evolutions Pierre-Louis Bossart
2015-02-13 21:14 ` [PATCH v6 1/7] ALSA: core: selection of audio_tstamp type and accuracy reports Pierre-Louis Bossart
2015-02-13 21:14 ` [PATCH v6 2/7] ALSA: core: pass audio tstamp config from userspace Pierre-Louis Bossart
2015-02-13 21:14 ` [PATCH v6 3/7] ALSA: core: pass audio tstamp config from userspace in compat mode Pierre-Louis Bossart
2015-02-13 21:14 ` Pierre-Louis Bossart [this message]
2015-02-13 21:14 ` [PATCH v6 5/7] ALSA: hda: replace .wallclock by .get_time_info Pierre-Louis Bossart
2015-02-13 21:14 ` [PATCH v6 6/7] ALSA: core: remove .wall_clock Pierre-Louis Bossart
2015-02-13 21:14 ` [PATCH v6 7/7] ALSA: bump PCM protocol to 2.0.13 Pierre-Louis Bossart
2015-02-20 16:39 ` [PATCH v6 0/7] audio timestamping evolutions Takashi Iwai
2015-02-21 0:18 ` Pierre-Louis Bossart
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1423862049-4073-5-git-send-email-pierre-louis.bossart@linux.intel.com \
--to=pierre-louis.bossart@linux.intel.com \
--cc=alsa-devel@alsa-project.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.