* alsa.c: compute next_date with snd_pcm_delay() if snd_pcm_status_get_tstamp

   doesn't work. Better than nothing but the sound is still poor with DVDs :(

modules/audio_output/alsa.c

@@ -758,14 +758,27 @@ static void ALSAFill( aout_instance_t * p_aout )
 
             snd_pcm_status_get_tstamp( p_status, &ts_next );
             next_date = (mtime_t)ts_next.tv_sec * 1000000 + ts_next.tv_usec;
-            /* With screwed drivers the timestamp is always zero; then we
-             * pass a null next_date to aout_OutputNextBuffer to ignore
-             * resampling */
             if( next_date )
             {
                 next_date += (mtime_t)snd_pcm_status_get_delay(p_status)
                         * 1000000 / p_aout->output.output.i_rate;
             }
+            else
+            {
+                /* With screwed ALSA drivers the timestamp is always zero;
+                 * use another method then */
+                snd_pcm_sframes_t delay;
+                ssize_t i_bytes = 0;
+
+                if( !snd_pcm_delay( p_sys->p_snd_pcm, &delay ) )
+                {
+                    i_bytes = snd_pcm_frames_to_bytes(p_sys->p_snd_pcm, delay);
+                }
+                next_date = mdate() + (mtime_t)i_bytes * 1000000
+                        / p_aout->output.output.i_bytes_per_frame
+                        / p_aout->output.output.i_rate
+                        * p_aout->output.output.i_frame_length;
+            }
         }
 
         p_buffer = aout_OutputNextBuffer( p_aout, next_date,

src/audio_output/output.c

@@ -307,10 +307,8 @@ aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
 
     /* Here we suppose that all buffers have the same duration - this is
      * generally true, and anyway if it's wrong it won't be a disaster.
-     * start_date may be null with some screwed ALSA driver; then do not
-     * try to play silences or resample.
      */
-    if ( start_date && p_buffer->start_date > start_date
+    if ( p_buffer->start_date > start_date
                          + (p_buffer->end_date - p_buffer->start_date) )
     /*
      *                   + AOUT_PTS_TOLERANCE )
@@ -329,7 +327,7 @@ aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
 
     p_aout->output.b_starving = 0;
 
-    if ( !b_can_sleek && start_date &&
+    if ( !b_can_sleek &&
           ( (p_buffer->start_date - start_date > AOUT_PTS_TOLERANCE)
              || (start_date - p_buffer->start_date > AOUT_PTS_TOLERANCE) ) )
     {