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

modules/audio_coding/main/source/acm_pcma.cc

@@ -0,0 +1,165 @@
+/*
+ *  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.
+ */
+
+#include "acm_common_defs.h"
+#include "acm_neteq.h"
+#include "acm_pcma.h"
+#include "trace.h"
+#include "webrtc_neteq.h"
+#include "webrtc_neteq_help_macros.h"
+
+// Codec interface
+#include "g711_interface.h"
+
+namespace webrtc
+{
+
+ACMPCMA::ACMPCMA(WebRtc_Word16 codecID)
+{
+    _codecID = codecID;
+}
+
+
+ACMPCMA::~ACMPCMA()
+{
+    return;
+}
+
+
+WebRtc_Word16 
+ACMPCMA::InternalEncode(
+    WebRtc_UWord8* bitStream,
+    WebRtc_Word16* bitStreamLenByte)
+{
+    *bitStreamLenByte = WebRtcG711_EncodeA(NULL, &_inAudio[_inAudioIxRead],
+        _frameLenSmpl*_noChannels, (WebRtc_Word16*)bitStream);
+    // increment the read index this tell the caller that how far 
+    // we have gone forward in reading the audio buffer
+    _inAudioIxRead += _frameLenSmpl*_noChannels;
+    return *bitStreamLenByte;
+}
+
+
+WebRtc_Word16 
+ACMPCMA::DecodeSafe(
+    WebRtc_UWord8* /* bitStream        */,
+    WebRtc_Word16  /* bitStreamLenByte */, 
+    WebRtc_Word16* /* audio            */, 
+    WebRtc_Word16* /* audioSamples     */, 
+    WebRtc_Word8*  /* speechType       */)
+{
+    return 0;
+}
+
+
+WebRtc_Word16 
+ACMPCMA::InternalInitEncoder(
+    WebRtcACMCodecParams* /* codecParams */)
+{
+    // This codec does not need initialization,
+    // PCM has no instance
+    return 0;    
+}
+
+
+WebRtc_Word16 
+ACMPCMA::InternalInitDecoder(
+    WebRtcACMCodecParams* /* codecParams */)
+{
+    // This codec does not need initialization,
+    // PCM has no instance
+    return 0;
+}
+
+
+WebRtc_Word32 ACMPCMA::CodecDef(
+    WebRtcNetEQ_CodecDef& codecDef,
+    const CodecInst&  codecInst)
+{
+    // Fill up the structure by calling 
+    // "SET_CODEC_PAR" & "SET_PCMA_FUNCTION."
+    // Then call NetEQ to add the codec to it's
+    // database.
+    SET_CODEC_PAR((codecDef), kDecoderPCMa, codecInst.pltype, NULL, 8000);
+    SET_PCMA_FUNCTIONS((codecDef));
+    return 0;
+}
+
+
+ACMGenericCodec*
+ACMPCMA::CreateInstance(void)
+{
+    return NULL;
+}
+
+
+WebRtc_Word16
+ACMPCMA::InternalCreateEncoder()
+{
+    // PCM has no instance
+    return 0;
+}
+
+
+WebRtc_Word16
+ACMPCMA::InternalCreateDecoder()
+{
+    // PCM has no instance
+    return 0;
+}
+
+
+void 
+ACMPCMA::InternalDestructEncoderInst(
+    void* /* ptrInst */)
+{
+    // PCM has no instance
+    return;
+}
+
+
+void 
+ACMPCMA::DestructEncoderSafe()
+{
+    // PCM has no instance
+    return;
+}
+
+
+void 
+ACMPCMA::DestructDecoderSafe()
+{
+    // PCM has no instance
+    _decoderInitialized = false;
+    _decoderExist = false;
+    return;
+}
+
+
+WebRtc_Word16 
+ACMPCMA::UnregisterFromNetEqSafe(
+    ACMNetEQ*     netEq,
+    WebRtc_Word16 payloadType)
+{
+    if(payloadType != _decoderParams.codecInstant.pltype)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID, 
+            "Cannot unregister codec %s given payload-type %d does not match \
+the stored payload type", 
+            _decoderParams.codecInstant.plname, 
+            payloadType, 
+            _decoderParams.codecInstant.pltype);
+        return -1;
+    }
+
+    return netEq->RemoveCodec(kDecoderPCMa);
+}
+
+} // namespace webrtc