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/*
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#define LOG_TAG "AmrInputStream"
#include "utils/Log.h"
#include "jni.h"
#include "JNIHelp.h"
#include "android_runtime/AndroidRuntime.h"
#include "gsmamr_enc.h"
// ----------------------------------------------------------------------------
using namespace android;
// Corresponds to max bit rate of 12.2 kbps.
static const int MAX_OUTPUT_BUFFER_SIZE = 32;
static const int FRAME_DURATION_MS = 20;
static const int SAMPLING_RATE_HZ = 8000;
static const int SAMPLES_PER_FRAME = ((SAMPLING_RATE_HZ * FRAME_DURATION_MS) / 1000);
static const int BYTES_PER_SAMPLE = 2; // Assume 16-bit PCM samples
static const int BYTES_PER_FRAME = (SAMPLES_PER_FRAME * BYTES_PER_SAMPLE);
struct GsmAmrEncoderState {
GsmAmrEncoderState()
: mEncState(NULL),
mSidState(NULL),
mLastModeUsed(0) {
}
~GsmAmrEncoderState() {}
void* mEncState;
void* mSidState;
int32_t mLastModeUsed;
};
static jint android_media_AmrInputStream_GsmAmrEncoderNew
(JNIEnv *env, jclass clazz) {
GsmAmrEncoderState* gae = new GsmAmrEncoderState();
if (gae == NULL) {
jniThrowRuntimeException(env, "Out of memory");
}
return (jint)gae;
}
static void android_media_AmrInputStream_GsmAmrEncoderInitialize
(JNIEnv *env, jclass clazz, jint gae) {
GsmAmrEncoderState *state = (GsmAmrEncoderState *) gae;
int32_t nResult = AMREncodeInit(&state->mEncState, &state->mSidState, false);
if (nResult != OK) {
jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",
"GsmAmrEncoder initialization failed %d", nResult);
}
}
static jint android_media_AmrInputStream_GsmAmrEncoderEncode
(JNIEnv *env, jclass clazz,
jint gae, jbyteArray pcm, jint pcmOffset, jbyteArray amr, jint amrOffset) {
jbyte inBuf[BYTES_PER_FRAME];
jbyte outBuf[MAX_OUTPUT_BUFFER_SIZE];
env->GetByteArrayRegion(pcm, pcmOffset, sizeof(inBuf), inBuf);
GsmAmrEncoderState *state = (GsmAmrEncoderState *) gae;
int32_t length = AMREncode(state->mEncState, state->mSidState,
(Mode) MR122,
(int16_t *) inBuf,
(unsigned char *) outBuf,
(Frame_Type_3GPP*) &state->mLastModeUsed,
AMR_TX_WMF);
if (length < 0) {
jniThrowExceptionFmt(env, "java/io/IOException",
"Failed to encode a frame with error code: %d", length);
return -1;
}
// The 1st byte of PV AMR frames are WMF (Wireless Multimedia Forum)
// bitpacked, i.e.;
// [P(4) + FT(4)]. Q=1 for good frame, P=padding bit, 0
// Here we are converting the header to be as specified in Section 5.3 of
// RFC 3267 (AMR storage format) i.e.
// [P(1) + FT(4) + Q(1) + P(2)].
if (length > 0) {
outBuf[0] = (outBuf[0] << 3) | 0x4;
}
env->SetByteArrayRegion(amr, amrOffset, length, outBuf);
return length;
}
static void android_media_AmrInputStream_GsmAmrEncoderCleanup
(JNIEnv *env, jclass clazz, jint gae) {
GsmAmrEncoderState *state = (GsmAmrEncoderState *)gae;
AMREncodeExit(&state->mEncState, &state->mSidState);
state->mEncState = NULL;
state->mSidState = NULL;
}
static void android_media_AmrInputStream_GsmAmrEncoderDelete
(JNIEnv *env, jclass clazz, jint gae) {
delete (GsmAmrEncoderState*)gae;
}
// ----------------------------------------------------------------------------
static JNINativeMethod gMethods[] = {
{"GsmAmrEncoderNew", "()I", (void*)android_media_AmrInputStream_GsmAmrEncoderNew},
{"GsmAmrEncoderInitialize", "(I)V", (void*)android_media_AmrInputStream_GsmAmrEncoderInitialize},
{"GsmAmrEncoderEncode", "(I[BI[BI)I", (void*)android_media_AmrInputStream_GsmAmrEncoderEncode},
{"GsmAmrEncoderCleanup", "(I)V", (void*)android_media_AmrInputStream_GsmAmrEncoderCleanup},
{"GsmAmrEncoderDelete", "(I)V", (void*)android_media_AmrInputStream_GsmAmrEncoderDelete},
};
int register_android_media_AmrInputStream(JNIEnv *env)
{
const char* const kClassPathName = "android/media/AmrInputStream";
return AndroidRuntime::registerNativeMethods(env,
kClassPathName, gMethods, NELEM(gMethods));
}
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