基于Android-Framework视频H264/H265解码
主要解码部分代码
void VideoPlayChannel::Decode()
{
int ret =-1;
int dec_out;
int err_cnt =0;
int dec_cnt =0;
uint32_t length =0;
uint64_t cur_time =0,last_time =0;
uint32_t sleep_time = 0;
if(mDecodeType == DECODE_H265)
{
sleep_time = 40000; // 根据实际情况来
}else
{
sleep_time = mFps==0?33000:1000000/mFps;
}
uint32_t decode_time =1;
uint32_t count = 0;
int n = 0;
ALOGD("%d doDecode start!!!",mIndex);
while(mIsStarted) {
usleep(1000);
decode_time =0;
if(mResetflag) {
if(mDecoder !=NULL) {
mDecoder->close();
mDecoder.clear();
mDecoder =NULL;
}
if(mCodecSurface ==NULL) {
pause();
continue;
}
mDecoder = new MyAvcDecoder(mWidth, mHeight, mCodecSurface, true);
if(mDecoder ==NULL) {
ALOGD("%d decode creat failed",mIndex);
pause();
continue;
}
// init decode engine type;0 is 264 mode, 1 is 265mode
mDecoder->init(mDecodeType);
ALOGD("reset myavcDecoder decode type %d,index %d\n",mDecodeType,mIndex);
ums_pipe_reset(mDecode_pipe);
mNeedIDR =true;
mResetflag =false;
mState =START;
continue;
}
if((ums_pipe_get_used_len(mDecode_pipe) >= 16) && (mState ==START) && !mResetflag)
{
length =ums_pipe_read( mDecode_pipe, &mf[0].size, sizeof(mf[0].size) );
count = 0;
if(length = 2000) || (100 == current_meet_type))
{
for (n = 0; n < 30; n++)
{
if (mDecodeType == 0) {
decode(mLogoBuffer,mLogoBufferSize, 1920,1080,10);
} else if (mDecodeType == 1) {
decode(mLogoBuffer265,mLogoBufferSize265, 1920,1080,25);
}
}
}
}
count = 0;
}
#endif
continue;
}
if(mDecodeType == DECODE_H265)
{
sleep_time = 40000;
}else
{
sleep_time = mFps==0?33000:1000000/mFps;
}
if(decode_time >sleep_time ) {//&& (mIndex ==1004 || mIndex ==2002)
decode_time -=sleep_time;
uint8_t nalType =mf[0].data[4] & 0x1f;
if(nalType == NAL_TYPE_SLICE)
{
continue;
}
}
cur_time =systemTime();
if(mDecoder!=NULL && mYv12Buffer !=NULL && (mIsStarted) && (1==stop_ok)){
ret=mDecoder->prepare(mf[0].data,0,mf[0].size,dec_cnt*sleep_time);
if(ret !=OK ){
char buf[50];
display_timestamp(buf, sizeof(buf));
ALOGE("%s:%d decode fail %s(0x%x) %d",buf,mIndex,strerror(ret),ret,dec_cnt);
if(ret == -38 || ret == -11 || ret == -19) {
if(!mResetflag && mState ==START) {
mResetflag =true;
pause();
continue;
}
}
else if (ret == -13)
{
system("busybox killall v2vserver");
}
else if(err_cnt ++ > 2 || mFlushflag) {
ALOGD(" %d decode flush",mIndex);
mDecoder->flush(mDecodeType);
err_cnt =1;
mFlushflag =false;
continue;
}
} else{
if(dec_cnt %2500 ==1) {
char buf[50];
display_timestamp(buf, sizeof(buf));
int buf_size = ums_pipe_get_used_len(mDecode_pipe);
int delay_ms = buf_size / 2048;
ALOGD("%s:%d decode counter %d,delay:%d ms,buf_size:%d",buf,mIndex,dec_cnt,delay_ms,buf_size);
}
err_cnt =1;
}
if(mIsStarted) {
mDecoder->onDoMoreStuff();
}
dec_cnt ++;
}
#if 1
last_time =systemTime();
decode_time =DELTA_AUDIO_TIMESTAMP(last_time,cur_time)/1000;
if(decode_time >sleep_time) {
if(decode_time >(sleep_time <<0)) {
char buf[50];
display_timestamp(buf, sizeof(buf));
}
if(mIndex !=1004) {
decode_time -=sleep_time/2;
}
else {
//decode_time -=sleep_time/2;
}
}
else {
uint32_t delay_time =sleep_time -decode_time;
if(mIndex <2000 || ((mIndex==2004)&& current_meet_type==100)) {
delay_time /=4;
} else {
int len =ums_pipe_get_used_len(mDecode_pipe);
if(mBitrate >100 ) {
if(len >(mBitrate <<3)) //*1014/8/16
{
delay_time /=4;
}
} else {
if(len >= 80000) //*1014/8/4
{
delay_time /=4;
}
}
}
if(delay_time >2000)
{
usleep(delay_time);
}
//
}
#endif
}
mErrorState =false;
mDecoder->close();
mDecoder.clear(); //FIXME!
mDecoder =NULL;
ALOGD("%d doDecode end!!!",mIndex);
} 卡顿和延时需要调整sleep_time和decode_time每帧的实际花费时间和解码实际时间。