From 1290f7de0e2bdd493fd70b5715863e118383b4cb Mon Sep 17 00:00:00 2001
From: =?utf8?q?Tim-Philipp=20M=C3=BCller?= <tim.muller@collabora.co.uk>
Date: Wed, 30 Nov 2011 23:15:03 +0000
Subject: [PATCH] Revert "alsasrc: fail gracefully when ALSA does not give
 timestamps"

This reverts commit c7282a5718c7f31f84fb31b2c38fab0f9a38e2b0.
---
 ext/alsa/gstalsasrc.c | 40 +++++-----------------------------------
 ext/alsa/gstalsasrc.h |  1 -
 2 files changed, 5 insertions(+), 36 deletions(-)

diff --git a/ext/alsa/gstalsasrc.c b/ext/alsa/gstalsasrc.c
index f7dca6b..e275bf3 100644
--- a/ext/alsa/gstalsasrc.c
+++ b/ext/alsa/gstalsasrc.c
@@ -254,63 +254,37 @@ gst_alsasrc_get_timestamp (GstAlsaSrc * src)
   snd_htimestamp_t tstamp;
   GstClockTime timestamp;
   snd_pcm_uframes_t availmax;
-  gint64 offset;
 
   GST_DEBUG_OBJECT (src, "Getting alsa timestamp!");
 
   if (!src) {
     GST_ERROR_OBJECT (src, "No alsa handle created yet !");
-    return GST_CLOCK_TIME_NONE;
+    return 0;
   }
 
   if (snd_pcm_status_malloc (&status) != 0) {
     GST_ERROR_OBJECT (src, "snd_pcm_status_malloc failed");
-    return GST_CLOCK_TIME_NONE;
   }
 
   if (snd_pcm_status (src->handle, status) != 0) {
     GST_ERROR_OBJECT (src, "snd_pcm_status failed");
-    snd_pcm_status_free (status);
-    return GST_CLOCK_TIME_NONE;
   }
 
   /* get high resolution time stamp from driver */
   snd_pcm_status_get_htstamp (status, &tstamp);
   timestamp = GST_TIMESPEC_TO_TIME (tstamp);
-  GST_DEBUG_OBJECT (src, "Base ts: %" GST_TIME_FORMAT,
-      GST_TIME_ARGS (timestamp));
-  if (timestamp == 0) {
-    /* This timestamp is supposed to represent the last sample, so 0 (which
-       can be returned on some ALSA setups (such as mine)) must mean that it
-       is invalid, unless there's just one sample, but we'll ignore that. */
-    GST_WARNING_OBJECT (src,
-        "No timestamp returned from snd_pcm_status_get_htstamp");
-    return GST_CLOCK_TIME_NONE;
-  }
 
   /* Max available frames sets the depth of the buffer */
   availmax = snd_pcm_status_get_avail_max (status);
 
   /* Compensate the fact that the timestamp references the last sample */
-  offset = -gst_util_uint64_scale_int (availmax * 2, GST_SECOND, src->rate);
+  timestamp -= gst_util_uint64_scale_int (availmax * 2, GST_SECOND, src->rate);
   /* Compensate for the delay until the package is available */
-  offset += gst_util_uint64_scale_int (snd_pcm_status_get_delay (status),
+  timestamp += gst_util_uint64_scale_int (snd_pcm_status_get_delay (status),
       GST_SECOND, src->rate);
 
   snd_pcm_status_free (status);
 
-  /* just in case, should not happen */
-  if (-offset > timestamp)
-    timestamp = 0;
-  else
-    timestamp -= offset;
-
-  /* Take first ts into account */
-  if (src->first_alsa_ts == GST_CLOCK_TIME_NONE) {
-    src->first_alsa_ts = timestamp;
-  }
-  timestamp -= src->first_alsa_ts;
-
   GST_DEBUG_OBJECT (src, "ALSA timestamp : %" GST_TIME_FORMAT,
       GST_TIME_ARGS (timestamp));
   return timestamp;
@@ -410,10 +384,8 @@ gst_alsasrc_create (GstBaseSrc * bsrc, guint64 offset, guint length,
   ret =
       GST_BASE_SRC_CLASS (parent_class)->create (bsrc, offset, length, outbuf);
   if (asrc->driver_timestamps == TRUE && *outbuf) {
-    GstClockTime ts = gst_alsasrc_get_timestamp (asrc);
-    if (GST_CLOCK_TIME_IS_VALID (ts)) {
-      GST_BUFFER_TIMESTAMP (*outbuf) = ts;
-    }
+    GST_BUFFER_TIMESTAMP (*outbuf) =
+        gst_alsasrc_get_timestamp ((GstAlsaSrc *) bsrc);
   }
 
   return ret;
@@ -427,7 +399,6 @@ gst_alsasrc_init (GstAlsaSrc * alsasrc, GstAlsaSrcClass * g_class)
   alsasrc->device = g_strdup (DEFAULT_PROP_DEVICE);
   alsasrc->cached_caps = NULL;
   alsasrc->driver_timestamps = FALSE;
-  alsasrc->first_alsa_ts = GST_CLOCK_TIME_NONE;
 
   alsasrc->alsa_lock = g_mutex_new ();
 }
@@ -972,7 +943,6 @@ gst_alsasrc_reset (GstAudioSrc * asrc)
   GST_DEBUG_OBJECT (alsa, "prepare");
   CHECK (snd_pcm_prepare (alsa->handle), prepare_error);
   GST_DEBUG_OBJECT (alsa, "reset done");
-  alsa->first_alsa_ts = GST_CLOCK_TIME_NONE;
   GST_ALSA_SRC_UNLOCK (asrc);
 
   return;
diff --git a/ext/alsa/gstalsasrc.h b/ext/alsa/gstalsasrc.h
index ba192be..7072ab7 100644
--- a/ext/alsa/gstalsasrc.h
+++ b/ext/alsa/gstalsasrc.h
@@ -65,7 +65,6 @@ struct _GstAlsaSrc {
   guint                 channels;
   gint                  bytes_per_sample;
   gboolean              driver_timestamps;
-  GstClockTime          first_alsa_ts;
 
   guint                 buffer_time;
   guint                 period_time;
-- 
2.7.4