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Changeset 1715

Timestamp:

Jan 19, 2008 9:39:52 AM (17 years ago)

Author:

bennylp

Message:

More work on ticket #438: Workaround for frame bursts from audio devices. See the ticket for more information

Location:

pjproject/trunk/pjmedia

Files:

-                      r1664
+                      r1715
  * for the sound device, and will try to limit the delay caused
  * by uneven callback calls to this delay.
+ *
+ * When this setting is enabled, the PJMEDIA_SOUND_BUFFER_COUNT
+ * macro will specify the maximum size of the delay buffer.
  */
 #ifndef PJMEDIA_SOUND_USE_DELAYBUF
 #   define PJMEDIA_SOUND_USE_DELAYBUF       0
-#endif
-/**
- * Whenever delay buffer is enabled for sound device,
- * PJMEDIA_SOUND_BUFFER_COUNT is better to be set to 1,
- * because sound callbacks will be called evenly thus
- * there's no need to have this buffer.
- */
-#if defined(PJMEDIA_SOUND_USE_DELAYBUF) && PJMEDIA_SOUND_USE_DELAYBUF!=0
-#   define PJMEDIA_SOUND_BUFFER_COUNT       1
 #endif
 …
  * combiner port, and dsound.c.
+ *
- * Note that when PJMEDIA_SOUND_USE_DELAYBUF is enabled, it's best to
- * set PJMEDIA_SOUND_BUFFER_COUNT to 1 to reduce voice latency.
+ *
  * Default: 6
  */

-                      r1692
+                      r1715
 #define THIS_FILE       "conference.c"
+#define RX_BUF_COUNT    PJMEDIA_SOUND_BUFFER_COUNT
+/* When delay buffer is used, we only need 1 frame buffering */
+#if defined(PJMEDIA_SOUND_USE_DELAYBUF) && PJMEDIA_SOUND_USE_DELAYBUF!=0
+#   define RX_BUF_COUNT     1
+#else
+#   define RX_BUF_COUNT     PJMEDIA_SOUND_BUFFER_COUNT
+#endif
 #define BYTES_PER_SAMPLE    2

-                      r1669
+                      r1715
 /* Since there are two operations performed (get & put), */
 /* these macros value must be minimum 2 and should be even number */
+#define WAITING_COUNT   8
+#define LEARN_COUNT     8
+#define WAITING_COUNT   4
+#define LEARN_COUNT     16
+/* Number of buffers to add to learnt level for additional stability */
+#define SAFE_MARGIN     2
+/*
+ * Some experimental data (with SAFE_MARGIN=1):
+ *
+ * System 1:
+ *  - XP, WMME, 10ms ptime,
+ *  - Sennheiser Headset+USB sound card
+ *  - Stable delaybuf level: 6, on WAITING_COUNT=4 and LEARNING_COUNT=48
+ *
+ * System 2:
+ *  - XP, WMME, 10ms ptime
+ *  - Onboard SoundMAX Digital Audio
+ *  - Stable delaybuf level: 6, on WAITING_COUNT=4 and LEARNING_COUNT=48
+ */
 struct pjmedia_delay_buf
 …
             b->state_count++;
             if (b->state_count == LEARN_COUNT) {
                 /* give ONE frame compensation */
                 b->max_level += 1;
+                /* give SAFE_MARGIN compensation for added stability */
+                b->max_level += SAFE_MARGIN;
                 PJ_LOG(5,(b->obj_name,"Delay buffer start running, level=%u",

r1417	r1715
32	32
33	33	#define THIS_FILE "echo_speex.c"
34		#define BUF_COUNT 16
	34	#define BUF_COUNT PJMEDIA_SOUND_BUFFER_COUNT
35	35	#define MIN_PREFETCH 2
36	36	#define MAX_PREFETCH (BUF_COUNT*2/3)

-                      r1665
+                      r1715
 #if PJMEDIA_SOUND_USE_DELAYBUF
     status = pjmedia_delay_buf_create(pool, "snd_buff", samples_per_frame,
+, -1, &snd_port->delay_buf);
+                                      PJMEDIA_SOUND_BUFFER_COUNT, -1,
+                                      &snd_port->delay_buf);
     PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
 #else

-                      r1417
+                      r1715
 #define THIS_FILE           "splitcomb.c"
 #define TMP_SAMP_TYPE       pj_int16_t
+#define MAX_BUF_CNT         PJMEDIA_SOUND_BUFFER_COUNT
+/* When delay buffer is used, we only need 1 frame buffering */
+#if defined(PJMEDIA_SOUND_USE_DELAYBUF) && PJMEDIA_SOUND_USE_DELAYBUF!=0
+#   define MAX_BUF_CNT      1
+#else
+#   define MAX_BUF_CNT      PJMEDIA_SOUND_BUFFER_COUNT
+#endif
 #if 0

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