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ext/alsa/gstalsasink.c: add error checking to snd_pcm_delay and remove duplicate call to snd_pcm_delay that caused is...

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Original commit message from CVS:
* ext/alsa/gstalsasink.c: (gst_alsa_sink_loop):
add error checking to snd_pcm_delay and remove duplicate call to
snd_pcm_delay that caused issues (see inline code comments)
* ext/alsa/gstalsasink.c: (gst_alsa_sink_get_time):
make more readable and fix return value when snd_pcm_delay fails
This commit is contained in:
Benjamin Otte 2004-05-16 02:51:29 +00:00
parent 4fc66c9509
commit e4e511cc39
2 changed files with 42 additions and 17 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2004-05-16 Benjamin Otte <otte@gnome.org>
* ext/alsa/gstalsasink.c: (gst_alsa_sink_loop):
add error checking to snd_pcm_delay and remove duplicate call to
snd_pcm_delay that caused issues (see inline code comments)
* ext/alsa/gstalsasink.c: (gst_alsa_sink_get_time):
make more readable and fix return value when snd_pcm_delay fails
2004-05-15 Jan Schmidt <thaytan@mad.scientisti.com>
* ext/gdk_pixbuf/pixbufscale.c: (gst_pixbufscale_method_get_type),
(gst_pixbufscale_get_type), (gst_pixbufscale_base_init),

51
ext/alsa/gstalsasink.c
View file

@ -327,7 +327,7 @@ static void
gst_alsa_sink_loop (GstElement * element)
{
snd_pcm_sframes_t avail, avail2, copied, sample_diff, max_discont;
snd_pcm_uframes_t samplestamp, time_sample;
snd_pcm_uframes_t samplestamp, expected;
gint i;
guint bytes; /* per channel */
GstAlsa *this = GST_ALSA (element);
@ -371,12 +371,25 @@ sink_restart:
gst_alsa_timestamp_to_samples (this,
GST_BUFFER_TIMESTAMP (sink->buf[i]));
max_discont = gst_alsa_timestamp_to_samples (this, this->max_discont);
time_sample =
gst_alsa_timestamp_to_samples (this,
gst_element_get_time (GST_ELEMENT (this)));
snd_pcm_delay (this->handle, &sample_diff);
/* actual diff = buffer samplestamp - played - to_play */
sample_diff = samplestamp - time_sample - sample_diff;
if (snd_pcm_delay (this->handle, &sample_diff) != 0) {
sample_diff = 0;
}
/* optimization: check if we're using our own clock
* This optimization is important because if we're using our own clock
* gst_element_get_time calls snd_pcm_delay and the following code assumes
* that both calls return the same value. However they can be wildly
* different, since snd_pcm_delay goes deep into the kernel.
*/
if (gst_element_get_clock (GST_ELEMENT (this)) ==
GST_CLOCK (GST_ALSA (this)->clock)) {
expected = this->transmitted;
} else {
expected =
gst_alsa_timestamp_to_samples (this,
gst_element_get_time (GST_ELEMENT (this))) + sample_diff;
/* actual diff = buffer samplestamp - played - to_play */
}
sample_diff = samplestamp - expected;
if ((!GST_BUFFER_TIMESTAMP_IS_VALID (sink->buf[i])) ||
(-max_discont <= sample_diff && sample_diff <= max_discont)) {
@ -394,8 +407,8 @@ sink_restart:
samples * snd_pcm_format_physical_width (this->format->format) /
8;
GST_INFO_OBJECT (this,
"Allocating %d bytes (%ld samples) now to resync: sample %ld expected, but got %ld",
size, MIN (bytes, sample_diff), time_sample, samplestamp);
"Allocating %d bytes (%ld samples) now to resync: sample %lu expected, but got %ld",
size, MIN (bytes, sample_diff), expected, samplestamp);
sink->data[i] = g_try_malloc (size);
if (!sink->data[i]) {
GST_WARNING_OBJECT (this,
@ -412,8 +425,8 @@ sink_restart:
} else if (gst_alsa_samples_to_bytes (this,
-sample_diff) >= sink->buf[i]->size) {
GST_INFO_OBJECT (this,
"Skipping %lu samples to resync (complete buffer): sample %ld expected, but got %ld",
gst_alsa_bytes_to_samples (this, sink->buf[i]->size), time_sample,
"Skipping %lu samples to resync (complete buffer): sample %lu expected, but got %ld",
gst_alsa_bytes_to_samples (this, sink->buf[i]->size), expected,
samplestamp);
/* this buffer is way behind */
gst_buffer_unref (sink->buf[i]);
@ -423,8 +436,8 @@ sink_restart:
gint difference = gst_alsa_samples_to_bytes (this, -samplestamp);
GST_INFO_OBJECT (this,
"Skipping %lu samples to resync: sample %ld expected, but got %ld",
(gulong) - sample_diff, time_sample, samplestamp);
"Skipping %lu samples to resync: sample %lu expected, but got %ld",
(gulong) - sample_diff, expected, samplestamp);
/* this buffer is only a bit behind */
sink->size[i] = sink->buf[i]->size - difference;
sink->data[i] = sink->buf[i]->data + difference;
@ -514,10 +527,14 @@ gst_alsa_sink_get_time (GstAlsa * this)
{
snd_pcm_sframes_t delay;
if (snd_pcm_delay (this->handle, &delay) == 0 && this->format) {
return GST_SECOND * (GstClockTime) (this->transmitted >
delay ? this->transmitted - delay : 0) / this->format->rate;
} else {
if (!this->format)
return 0;
if (snd_pcm_delay (this->handle, &delay) != 0) {
return this->transmitted / this->format->rate;
}
if (this->transmitted <= delay) {
return 0;
}
return GST_SECOND * (this->transmitted - delay) / this->format->rate;
}