- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{
//_readagainTime = [self getTimeNow];
//[h264Decoder decodeNalu:(uint8_t *)[data bytes] withSize:(uint32_t)data.length];
int nRef = 0;
uint8_t *puf = nil;
if(tag == Data){
int type = [self typeOfNalu:data];
if (type == 7 || type == 8 || type == 6 || type == 5) { //SPS PPS SEI IDR
if (type == 7 || type == 8) {
if (h264Decoder) {
nRef = (int)data.length;
puf = (uint8_t *)malloc(data.length);
memcpy(puf,[data bytes],data.length);
const char bytes[] = "\x00\x00\x00\x01";
size_t length = (sizeof bytes) - 1;
NSData *ByteHeader = [NSData dataWithBytes:bytes length:length];
NSMutableData *h264Data = [[NSMutableData alloc] init];
[h264Data appendData:ByteHeader];
[h264Data appendData:[NSData dataWithBytes:puf length:nRef]];
h264Decoder.nalu_type = type;
[h264Decoder decodeNalu:(uint8_t *)[h264Data bytes] withSize:(uint32_t)h264Data.length];
free(puf);
puf = nil;
}
}else{
[keyFrame appendData:lastStartCode];
[keyFrame appendBytes:[data bytes] length:[data length] - [self startCodeLenth:data]];
}
}
if (type == 5 || type == 1 || type == 6) {//IDR P frame
if (type == 5 || type == 6) {
h264Decoder.nalu_type = type;
[h264Decoder decodeNalu:(uint8_t *)[keyFrame bytes] withSize:(uint32_t)keyFrame.length];
keyFrame = [[NSMutableData alloc] init];//reset keyframe
}else{
NSMutableData *nalu = [[NSMutableData alloc]initWithData:lastStartCode];
[nalu appendBytes:[data bytes] length:[data length]-[self startCodeLenth:data]];
char *chBuf = (char*)[nalu bytes];
// NSLog(@"chbuf ======== %x %x %x %x %x %x %x",chBuf[0],chBuf[1],chBuf[2],chBuf[3],chBuf[4],chBuf[5],chBuf[6]);
if (chBuf[0] == 0x00 && chBuf[1]==0x00 && chBuf[2]==0x01) {
nRef = (int)nalu.length-3;
puf = (uint8_t *)malloc(nalu.length-3);
memcpy(puf,[nalu bytes]+3,nalu.length-3);
const char bytes[] = "\x00\x00\x00\x01";
size_t length = (sizeof bytes) - 1;
NSData *ByteHeader = [NSData dataWithBytes:bytes length:length];
NSMutableData *h264Data = [[NSMutableData alloc] init];
[h264Data appendData:ByteHeader];
[h264Data appendData:[NSData dataWithBytes:puf length:nRef]];
h264Decoder.nalu_type = type;
[h264Decoder decodeNalu:(uint8_t *)[h264Data bytes] withSize:(uint32_t)h264Data.length];
}else if (chBuf[0] == 0x00 && chBuf[1]==0x00 && chBuf[2]==0x00 && chBuf[3]==0x01) {
nRef = (int)nalu.length-4;
puf = (uint8_t *)malloc(nalu.length-4);
memcpy(puf,[nalu bytes]+4,nalu.length-4);
const char bytes[] = "\x00\x00\x00\x01";
size_t length = (sizeof bytes) - 1;
NSData *ByteHeader = [NSData dataWithBytes:bytes length:length];
NSMutableData *h264Data = [[NSMutableData alloc] init];
[h264Data appendData:ByteHeader];
[h264Data appendData:[NSData dataWithBytes:puf length:nRef]];
h264Decoder.nalu_type = type;
[h264Decoder decodeNalu:(uint8_t *)[h264Data bytes] withSize:(uint32_t)h264Data.length];
} else{
const char bytes[] = "\x00\x00\x00\x01";
size_t length = (sizeof bytes) - 1;
NSData *ByteHeader = [NSData dataWithBytes:bytes length:length];
NSMutableData *h264Data = [[NSMutableData alloc] init];
[h264Data appendData:ByteHeader];
[h264Data appendData:nalu];
h264Decoder.nalu_type = type;
[h264Decoder decodeNalu:(uint8_t *)[h264Data bytes] withSize:(uint32_t)h264Data.length];
}
//NSLog(@"chBuf %x %x %x %x %x %x %x %x %x %x",chBuf[0],chBuf[1],chBuf[2],chBuf[3],chBuf[4],chBuf[5],chBuf[6],chBuf[7],chBuf[8],chBuf[9]);
}
}else{
// isGetData = NO;
[socket readDataToData:startcodeData withTimeout:-1 tag:Data];
}
}
if (data.length > [self startCodeLenth:data]) {
[self saveStartCode:data];
}
}
- (int)typeOfNalu:(NSData *)data{
char first = *(char *)[data bytes];
return first & 0x1f;
}
- (int)startCodeLenth:(NSData *)data
{
char temp = *((char *)[data bytes] + [data length] - 4);
return temp == 0x00 ? 4 : 3;
}
- (void)saveStartCode:(NSData *)data
{
int startCodeLen = [self startCodeLenth:data];
NSRange startCodeRange = {[data length] - startCodeLen, startCodeLen};
lastStartCode = [data subdataWithRange:startCodeRange];
}
最主要的是通过socket得到裸码流以后进行转换，在这里卡了好久