git-svn-id: http://webrtc.googlecode.com/svn/trunk@4 4adac7df-926f-26a2-2b94-8c16560cd09d

2011-05-30 11:22:19 +00:00
parent 01813fe945
commit 77ae29bc81
1153 changed files with 404089 additions and 0 deletions
--- a/modules/audio_coding/NetEQ/main/source/rtcp.c
+++ b/modules/audio_coding/NetEQ/main/source/rtcp.c
@@ -0,0 +1,134 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * Implementation of RTCP statistics reporting.
+ */
+
+#include "rtcp.h"
+
+#include <string.h>
+
+#include "signal_processing_library.h"
+
+int WebRtcNetEQ_RTCPInit(WebRtcNetEQ_RTCP_t *RTCP_inst, WebRtc_UWord16 uw16_seqNo)
+{
+    /*
+     * Initialize everything to zero and then set the start values for the RTP packet stream.
+     */
+    WebRtcSpl_MemSetW16((WebRtc_Word16*) RTCP_inst, 0,
+        sizeof(WebRtcNetEQ_RTCP_t) / sizeof(WebRtc_Word16));
+    RTCP_inst->base_seq = uw16_seqNo;
+    RTCP_inst->max_seq = uw16_seqNo;
+    return 0;
+}
+
+int WebRtcNetEQ_RTCPUpdate(WebRtcNetEQ_RTCP_t *RTCP_inst, WebRtc_UWord16 uw16_seqNo,
+                           WebRtc_UWord32 uw32_timeStamp, WebRtc_UWord32 uw32_recTime)
+{
+    WebRtc_Word16 w16_SeqDiff;
+    WebRtc_Word32 w32_TimeDiff;
+    WebRtc_Word32 w32_JitterDiff;
+
+    /*
+     * Update number of received packets, and largest packet number received.
+     */
+    RTCP_inst->received++;
+    w16_SeqDiff = uw16_seqNo - RTCP_inst->max_seq;
+    if (w16_SeqDiff >= 0)
+    {
+        if (uw16_seqNo < RTCP_inst->max_seq)
+        {
+            /* Wrap around detected */
+            RTCP_inst->cycles++;
+        }
+        RTCP_inst->max_seq = uw16_seqNo;
+    }
+
+    /* Calculate Jitter, and update previous timestamps */
+    /* Note that the value in RTCP_inst->jitter is in Q4. */
+    if (RTCP_inst->received > 1)
+    {
+        w32_TimeDiff = (uw32_recTime - (uw32_timeStamp - RTCP_inst->transit));
+        w32_TimeDiff = WEBRTC_SPL_ABS_W32(w32_TimeDiff);
+        w32_JitterDiff = WEBRTC_SPL_LSHIFT_W16(w32_TimeDiff, 4) - RTCP_inst->jitter;
+        RTCP_inst->jitter = RTCP_inst->jitter + WEBRTC_SPL_RSHIFT_W32((w32_JitterDiff + 8), 4);
+    }
+    RTCP_inst->transit = (uw32_timeStamp - uw32_recTime);
+    return 0;
+}
+
+int WebRtcNetEQ_RTCPGetStats(WebRtcNetEQ_RTCP_t *RTCP_inst,
+                             WebRtc_UWord16 *puw16_fraction_lost,
+                             WebRtc_UWord32 *puw32_cum_lost, WebRtc_UWord32 *puw32_ext_max,
+                             WebRtc_UWord32 *puw32_jitter, WebRtc_Word16 doNotReset)
+{
+    WebRtc_UWord32 uw32_exp_nr, uw32_exp_interval, uw32_rec_interval;
+    WebRtc_Word32 w32_lost;
+
+    /* Extended highest sequence number received */
+    *puw32_ext_max
+        = (WebRtc_UWord32) WEBRTC_SPL_LSHIFT_W32((WebRtc_UWord32)RTCP_inst->cycles, 16)
+            + RTCP_inst->max_seq;
+
+    /*
+     * Calculate expected number of packets and compare it to the number of packets that
+     * were actually received => the cumulative number of packets lost can be extracted.
+     */
+    uw32_exp_nr = *puw32_ext_max - RTCP_inst->base_seq + 1;
+    if (RTCP_inst->received == 0)
+    {
+        /* no packets received, assume none lost */
+        *puw32_cum_lost = 0;
+    }
+    else if (uw32_exp_nr > RTCP_inst->received)
+    {
+        *puw32_cum_lost = uw32_exp_nr - RTCP_inst->received;
+        if (*puw32_cum_lost > (WebRtc_UWord32) 0xFFFFFF)
+        {
+            *puw32_cum_lost = 0xFFFFFF;
+        }
+    }
+    else
+    {
+        *puw32_cum_lost = 0;
+    }
+
+    /* Fraction lost (Since last report) */
+    uw32_exp_interval = uw32_exp_nr - RTCP_inst->exp_prior;
+    if (!doNotReset)
+    {
+        RTCP_inst->exp_prior = uw32_exp_nr;
+    }
+    uw32_rec_interval = RTCP_inst->received - RTCP_inst->rec_prior;
+    if (!doNotReset)
+    {
+        RTCP_inst->rec_prior = RTCP_inst->received;
+    }
+    w32_lost = (WebRtc_Word32) (uw32_exp_interval - uw32_rec_interval);
+    if (uw32_exp_interval == 0 || w32_lost <= 0 || RTCP_inst->received == 0)
+    {
+        *puw16_fraction_lost = 0;
+    }
+    else
+    {
+        *puw16_fraction_lost = (WebRtc_UWord16) (WEBRTC_SPL_LSHIFT_W32(w32_lost, 8)
+            / uw32_exp_interval);
+    }
+    if (*puw16_fraction_lost > 0xFF)
+    {
+        *puw16_fraction_lost = 0xFF;
+    }
+
+    /* Inter-arrival jitter */
+    *puw32_jitter = (RTCP_inst->jitter) >> 4; /* scaling from Q4 */
+    return 0;
+}
+