[PATCH] aplay: Support setting timestamp

[Pavel Hofman <pavel.hofman@ivitera.com>]

To allow enabling timestamp and specify its type, a new option
--tstamp-type=TYPE is added. Recognized values are none (default),
gettimeofday, monotonic, monotonic-raw.

Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
---
 aplay/aplay.1 |  4 ++++
 aplay/aplay.c | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/aplay/aplay.1 b/aplay/aplay.1
index 3bba59d..d3b7dce 100644
--- a/aplay/aplay.1
+++ b/aplay/aplay.1
@@ -207,6 +207,10 @@ sampling rates, numbers of channels, period and buffer bytes/sizes/times.
 For raw device hw:X this option basically lists hardware capabilities of
 the soundcard.
 .TP
+\fI\-\-tstamp\-type=TYPE\fP
+Specifies timestamp type inside the software configuration container.
+Types are: none (default), gettimeofday, monotonic, monotonic\-raw.
+.TP
 \fI\-\-fatal\-errors\fP
 Disables recovery attempts when errors (e.g. xrun) are encountered; the
 aplay process instead aborts immediately.
diff --git a/aplay/aplay.c b/aplay/aplay.c
index 63a4e34..5d15a32 100644
--- a/aplay/aplay.c
+++ b/aplay/aplay.c
@@ -139,6 +139,8 @@ static int use_strftime = 0;
 volatile static int recycle_capture_file = 0;
 static long term_c_lflag = -1;
 static int dump_hw_params = 0;
+static int enable_tstamp = 0;
+static snd_pcm_tstamp_type_t tstamp_type = SND_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
 
 static int fd = -1;
 static off64_t pbrec_count = LLONG_MAX, fdcount;
@@ -244,6 +246,8 @@ _("Usage: %s [OPTION]... [FILE]...\n"
 "    --process-id-file   write the process ID here\n"
 "    --use-strftime      apply the strftime facility to the output file name\n"
 "    --dump-hw-params    dump hw_params of the device\n"
+"    --tstamp-type=TYPE  set timestamp (TYPE: none (default), gettimeofday,\n"
+"                        monotonic, monotonic-raw)\n"
 "    --fatal-errors      treat all errors as fatal\n"
   )
 		, command);
@@ -430,6 +434,7 @@ enum {
 	OPT_PROCESS_ID_FILE,
 	OPT_USE_STRFTIME,
 	OPT_DUMP_HWPARAMS,
+	OPT_TSTAMP_TYPE,
 	OPT_FATAL_ERRORS,
 };
 
@@ -517,6 +522,7 @@ int main(int argc, char *argv[])
 		{"use-strftime", 0, 0, OPT_USE_STRFTIME},
 		{"interactive", 0, 0, 'i'},
 		{"dump-hw-params", 0, 0, OPT_DUMP_HWPARAMS},
+		{"tstamp-type", 1, 0, OPT_TSTAMP_TYPE},
 		{"fatal-errors", 0, 0, OPT_FATAL_ERRORS},
 #ifdef CONFIG_SUPPORT_CHMAP
 		{"chmap", 1, 0, 'm'},
@@ -799,6 +805,23 @@ int main(int argc, char *argv[])
 		case OPT_DUMP_HWPARAMS:
 			dump_hw_params = 1;
 			break;
+		case OPT_TSTAMP_TYPE:
+			if (strcasecmp(optarg, "gettimeofday") == 0) {
+				enable_tstamp = 1;
+				tstamp_type = SND_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
+			} else if (strcasecmp(optarg, "monotonic") == 0) {
+				enable_tstamp = 1;
+				tstamp_type = SND_PCM_TSTAMP_TYPE_MONOTONIC;
+			} else if (strcasecmp(optarg, "monotonic-raw") == 0) {
+				enable_tstamp = 1;
+				tstamp_type = SND_PCM_TSTAMP_TYPE_MONOTONIC_RAW;
+			} else if (strcasecmp(optarg, "none") == 0)
+				enable_tstamp = 0;
+			else {
+				error(_("unrecognized timestamp type %s"), optarg);
+				return 1;
+			}
+			break;
 		case OPT_FATAL_ERRORS:
 			fatal_errors = 1;
 			break;
@@ -1453,6 +1476,15 @@ static void set_params(void)
 		stop_threshold = (double) rate * stop_delay / 1000000;
 	err = snd_pcm_sw_params_set_stop_threshold(handle, swparams, stop_threshold);
 	assert(err >= 0);
+	if (enable_tstamp) {
+		err = snd_pcm_sw_params_set_tstamp_mode(handle, swparams, SND_PCM_TSTAMP_ENABLE);
+		assert(err >= 0);
+		err = snd_pcm_sw_params_set_tstamp_type(handle, swparams, tstamp_type);
+		if (err < 0) {
+			error(_("Unable to set the requested timestamp type."));
+			prg_exit(EXIT_FAILURE);
+		}
+	}
 
 	if (snd_pcm_sw_params(handle, swparams) < 0) {
 		error(_("unable to install sw params:"));
-- 
2.25.1