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ESP32-audioI2S
Commit 384ba4d5 authored by schreibfaul1's avatar schreibfaul1
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impl countCode 1 and 2

parent a48d33c8
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src/opus_decoder/opus_decoder.cpp
View file @ 384ba4d5
......@@ -3,7 +3,7 @@
* based on Xiph.Org Foundation celt decoder
*
* Created on: 26.01.2023
* Updated on: 08.02.2024
* Updated on: 10.02.2024
*/
//----------------------------------------------------------------------------------------------------------------------
// O G G / O P U S I M P L.
......@@ -100,11 +100,8 @@ void OPUSsetDefaults(){
int OPUSDecode(uint8_t *inbuf, int *bytesLeft, short *outbuf){
const uint32_t CELT_SET_END_BAND_REQUEST = 10012;
static uint16_t fs = 0;
static uint8_t M = 0;
static uint8_t configNr = 31; // FULLBAND
static uint16_t paddingBytes = 0;
uint8_t paddingLength = 0;
static uint8_t frameCount = 0;
static int8_t configNr = 0;
uint8_t endband = 21;
static uint16_t samplesPerFrame = 0;
int ret = ERR_OPUS_NONE;
......@@ -112,10 +109,9 @@ int OPUSDecode(uint8_t *inbuf, int *bytesLeft, short *outbuf){
if(s_f_opusParseOgg){
s_f_opusParseOgg = false;
fs = 0;
M = 0;
paddingBytes = 0;
frameCount = 0;
s_opusCountCode = 0;
samplesPerFrame = 0;
ret = OPUSparseOGG(inbuf, bytesLeft);
if(ret != ERR_OPUS_NONE) return ret; // error
inbuf += s_opusOggHeaderSize;
......@@ -157,6 +153,9 @@ processChunk: // we can't return more than 2* 4096 bytes at a time (max OPUS
s_f_nextChunk = false;
opusSegmentLength = s_opusSegmentLength;
}
else{
opusSegmentLength = 0;
}
// log_i("page(2) opusSegmentLength %i, s_opusRemainBlockPicLen %i", opusSegmentLength, s_opusRemainBlockPicLen);
if(s_opusRemainBlockPicLen <= 0 && opusSegmentLength <= 0){
......@@ -206,8 +205,6 @@ processChunk: // we can't return more than 2* 4096 bytes at a time (max OPUS
}
log_e("never reach this!");
}
if(s_opusCountCode > 0) goto FramePacking; // more than one frame in the packet
if(s_opusSegmentTableSize > 0){
......@@ -217,6 +214,7 @@ processChunk: // we can't return more than 2* 4096 bytes at a time (max OPUS
}
configNr = parseOpusTOC(inbuf[0]);
if(configNr < 0) return configNr; // SILK or Hybrid mode
samplesPerFrame = opus_packet_get_samples_per_frame(inbuf, s_opusSamplerate);
switch(configNr){
case 16 ... 19: endband = 13; // OPUS_BANDWIDTH_NARROWBAND
......@@ -227,48 +225,300 @@ processChunk: // we can't return more than 2* 4096 bytes at a time (max OPUS
break;
case 28 ... 31: endband = 21; // OPUS_BANDWIDTH_FULLBAND
break;
default: log_e("unknown bandwidth, configNr is: %i", configNr);
default: log_e("unknown bandwidth, configNr is: %d", configNr);
endband = 21; // assume OPUS_BANDWIDTH_FULLBAND
break;
}
celt_decoder_ctl(CELT_SET_END_BAND_REQUEST, endband);
FramePacking: // https://www.tech-invite.com/y65/tinv-ietf-rfc-6716-2.html 3.2. Frame Packing
switch(s_opusCountCode){
case 0: // Code 0: One Frame in the Packet
*bytesLeft -= len;
s_opusCurrentFilePos += len;
len--;
inbuf++;
ec_dec_init((uint8_t *)inbuf, len);
ret = celt_decode_with_ec(inbuf, len, (int16_t*)outbuf, samplesPerFrame);
if(ret < 0) goto exit; // celt error
s_opusValidSamples = ret;
ret = ERR_OPUS_NONE;
ret = opus_FramePacking_Code0(inbuf, bytesLeft, outbuf, len, samplesPerFrame);
break;
case 1: // Code 1: Two Frames in the Packet, Each with Equal Compressed Size
log_e("OPUS countCode 1 not supported yet"); vTaskDelay(1000); // todo
ret = opus_FramePacking_Code1(inbuf, bytesLeft, outbuf, len, samplesPerFrame, &frameCount);
if(ret == OPUS_CONTINUE) return ret;
break;
case 2: // Code 2: Two Frames in the Packet, with Different Compressed Sizes
log_e("OPUS countCode 2 not supported yet"); vTaskDelay(1000); // todo
ret = opus_FramePacking_Code2(inbuf, bytesLeft, outbuf, len, samplesPerFrame, &frameCount);
if(ret == OPUS_CONTINUE) return ret;
break;
case 3: // Code 3: A Signaled Number of Frames in the Packet
if(M == 0){
ret = opus_FramePacking_Code3(inbuf, bytesLeft, outbuf, len, samplesPerFrame, &frameCount);
if(ret == OPUS_CONTINUE) return ret;
break;
default:
log_e("unknown countCode %i", s_opusCountCode);
break;
}
if(s_opusSegmentTableSize == 0){
s_opusSegmentTableRdPtr = -1; // back to the parking position
s_f_opusParseOgg = true;
}
return ret;
}
//----------------------------------------------------------------------------------------------------------------------------------------------------
int8_t opus_FramePacking_Code0(uint8_t *inbuf, int *bytesLeft, short *outbuf, int packetLen, uint16_t samplesPerFrame){
/* Code 0: One Frame in the Packet
For code 0 packets, the TOC byte is immediately followed by N-1 bytes
of compressed data for a single frame (where N is the size of the
packet), as illustrated
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| config |s|0|0| |
+-+-+-+-+-+-+-+-+ |
| Compressed frame 1 (N-1 bytes)... :
: |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
int ret = 0;
*bytesLeft -= packetLen;
s_opusCurrentFilePos += packetLen;
packetLen--;
inbuf++;
ec_dec_init((uint8_t *)inbuf, packetLen);
ret = celt_decode_with_ec(inbuf, packetLen, (int16_t*)outbuf, samplesPerFrame);
if(ret < 0) return ret;
s_opusValidSamples = ret;
return ERR_OPUS_NONE;
}
//----------------------------------------------------------------------------------------------------------------------------------------------------
int8_t opus_FramePacking_Code1(uint8_t *inbuf, int *bytesLeft, short *outbuf, int packetLen, uint16_t samplesPerFrame, uint8_t* frameCount){
/* Code 1: Two Frames in the Packet, Each with Equal Compressed Size
For code 1 packets, the TOC byte is immediately followed by the (N-1)/2 bytes [where N is the size of the packet] of compressed
data for the first frame, followed by (N-1)/2 bytes of compressed data for the second frame, as illustrated. The number of payload bytes
available for compressed data, N-1, MUST be even for all code 1 packets.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| config |s|0|1| |
+-+-+-+-+-+-+-+-+ :
| Compressed frame 1 ((N-1)/2 bytes)... |
: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ :
| Compressed frame 2 ((N-1)/2 bytes)... |
: +-+-+-+-+-+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
int ret = 0;
static uint16_t c1fs = 0;
if(*frameCount == 0){
packetLen--;
inbuf++;
*bytesLeft -= 1;
s_opusCurrentFilePos += 1;
c1fs = packetLen / 2;
// log_w("OPUS countCode 1 len %i, c1fs %i", len, c1fs);
*frameCount = 2;
}
if(*frameCount > 0){
ec_dec_init((uint8_t *)inbuf, c1fs);
ret = celt_decode_with_ec(inbuf, c1fs, (int16_t*)outbuf, samplesPerFrame);
if(ret < 0) return ret;
s_opusValidSamples = ret;
*bytesLeft -= c1fs;
s_opusCurrentFilePos += c1fs;
}
*frameCount -= 1;
if(*frameCount > 0) return OPUS_CONTINUE;
s_opusCountCode = 0;
c1fs = 0;
return ERR_OPUS_NONE;
}
//----------------------------------------------------------------------------------------------------------------------------------------------------
int8_t opus_FramePacking_Code2(uint8_t *inbuf, int *bytesLeft, short *outbuf, int packetLen, uint16_t samplesPerFrame, uint8_t* frameCount){
/* Code 2: Two Frames in the Packet, with Different Compressed Sizes
For code 2 packets, the TOC byte is followed by a one- or two-byte sequence indicating the length of the first frame (marked N1 in the Figure),
followed by N1 bytes of compressed data for the first frame. The remaining N-N1-2 or N-N1-3 bytes are the compressed data for the second frame.
This is illustrated in the Figure. A code 2 packet MUST contain enough bytes to represent a valid length. For example, a 1-byte code 2 packet
is always invalid, and a 2-byte code 2 packet whose second byte is in the range 252...255 is also invalid. The length of the first frame, N1,
MUST also be no larger than the size of the payload remaining after decoding that length for all code 2 packets. This makes, for example,
a 2-byte code 2 packet with a second byte in the range 1...251 invalid as well (the only valid 2-byte code 2 packet is one where the length of
both frames is zero).
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| config |s|1|0| N1 (1-2 bytes): |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ :
| Compressed frame 1 (N1 bytes)... |
: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| Compressed frame 2... :
: |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
// log_w("OPUS countCode 2 packetLen %i", packetLen); // todo
int ret = 0;
static uint16_t firstFrameLength = 0;
static uint16_t secondFrameLength = 0;
if(*frameCount == 0){
uint8_t b1 = inbuf[1];
uint8_t b2 = inbuf[2];
if(b1 < 255){
packetLen -= 2;
*bytesLeft -= 2;
s_opusCurrentFilePos += 2;
inbuf += 2;
firstFrameLength = b1;
}
else{
packetLen -= 3;
*bytesLeft -= 3;
s_opusCurrentFilePos += 3;
inbuf += 3;
firstFrameLength = b1 + b2;
}
secondFrameLength = packetLen - firstFrameLength;
*frameCount = 2;
}
if(*frameCount == 2){
ec_dec_init((uint8_t *)inbuf, firstFrameLength);
ret = celt_decode_with_ec(inbuf, firstFrameLength, (int16_t*)outbuf, samplesPerFrame);
if(ret < 0) return ret;
s_opusValidSamples = ret;
*bytesLeft -= firstFrameLength;
s_opusCurrentFilePos += firstFrameLength;
}
if(*frameCount == 1){
ec_dec_init((uint8_t *)inbuf, secondFrameLength);
ret = celt_decode_with_ec(inbuf, secondFrameLength, (int16_t*)outbuf, samplesPerFrame);
if(ret < 0) return ret;
s_opusValidSamples = ret;
*bytesLeft -= secondFrameLength;
s_opusCurrentFilePos += secondFrameLength;
}
*frameCount -= 1;
if(*frameCount > 0) return OPUS_CONTINUE;
s_opusCountCode = 0;
firstFrameLength = 0;
secondFrameLength = 0;
return ERR_OPUS_NONE;
}
//----------------------------------------------------------------------------------------------------------------------------------------------------
int8_t opus_FramePacking_Code3(uint8_t *inbuf, int *bytesLeft, short *outbuf, int packetLen, uint16_t samplesPerFrame, uint8_t* frameCount){
/* Code 3: A Signaled Number of Frames in the Packet
Code 3 packets signal the number of frames, as well as additional padding, called "Opus padding" to indicate that this padding is added
at the Opus layer rather than at the transport layer. Code 3 packets MUST have at least 2 bytes [R6,R7]. The TOC byte is followed by a
byte encoding the number of frames in the packet in bits 2 to 7 (marked "M" in the Figure ) 0
0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
|v|p| M |
+-+-+-+-+-+-+-+-+
with bit 1 indicating whether or not Opus
padding is inserted (marked "p" in Figure 5), and bit 0 indicating VBR (marked "v" in Figure). M MUST NOT be zero, and the audio
duration contained within a packet MUST NOT exceed 120 ms. This limits the maximum frame count for any frame size to 48 (for 2.5 ms
frames), with lower limits for longer frame sizes. The Figure below illustrates the layout of the frame count byte.
When Opus padding is used, the number of bytes of padding is encoded in the bytes following the frame count byte. Values from 0...254
indicate that 0...254 bytes of padding are included, in addition to the byte(s) used to indicate the size of the padding. If the value
is 255, then the size of the additional padding is 254 bytes, plus the padding value encoded in the next byte. There MUST be at least
one more byte in the packet in this case [R6,R7]. The additional padding bytes appear at the end of the packet and MUST be set to zero
by the encoder to avoid creating a covert channel. The decoder MUST accept any value for the padding bytes, however.
Although this encoding provides multiple ways to indicate a given number of padding bytes, each uses a different number of bytes to
indicate the padding size and thus will increase the total packet size by a different amount. For example, to add 255 bytes to a
packet, set the padding bit, p, to 1, insert a single byte after the frame count byte with a value of 254, and append 254 padding bytes
with the value zero to the end of the packet. To add 256 bytes to a packet, set the padding bit to 1, insert two bytes after the frame
count byte with the values 255 and 0, respectively, and append 254 padding bytes with the value zero to the end of the packet. By using
the value 255 multiple times, it is possible to create a packet of any specific, desired size. Let P be the number of header bytes used
to indicate the padding size plus the number of padding bytes themselves (i.e., P is the total number of bytes added to the
packet). Then, P MUST be no more than N-2. In the CBR case, let R=N-2-P be the number of bytes remaining in the packet after subtracting the
(optional) padding. Then, the compressed length of each frame in bytes is equal to R/M. The value R MUST be a non-negative integer multiple
of M. The compressed data for all M frames follows, each of size R/M bytes, as illustrated in the Figure below.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| config |s|1|1|0|p| M | Padding length (Optional) :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
: Compressed frame 1 (R/M bytes)... :
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
: Compressed frame 2 (R/M bytes)... :
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
: ... :
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
: Compressed frame M (R/M bytes)... :
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: Opus Padding (Optional)... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
In the VBR case, the (optional) padding length is followed by M-1 frame lengths (indicated by "N1" to "N[M-1]" in Figure 7), each encoded in a
one- or two-byte sequence as described above. The packet MUST contain enough data for the M-1 lengths after removing the (optional) padding,
and the sum of these lengths MUST be no larger than the number of bytes remaining in the packet after decoding them. The compressed data for
all M frames follows, each frame consisting of the indicated number of bytes, with the final frame consuming any remaining bytes before the final
padding, as illustrated in the Figure below. The number of header bytes (TOC byte, frame count byte, padding length bytes, and frame length bytes),
plus the signaled length of the first M-1 frames themselves, plus the signaled length of the padding MUST be no larger than N, the total
size of the packet.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| config |s|1|1|1|p| M | Padding length (Optional) :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: N1 (1-2 bytes): N2 (1-2 bytes): ... : N[M-1] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
: Compressed frame 1 (N1 bytes)... :
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
: Compressed frame 2 (N2 bytes)... :
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
: ... :
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
: Compressed frame M... :
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: Opus Padding (Optional)... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
static uint16_t paddingBytes = 0;
static uint16_t fs = 0;
int ret = 0;
uint8_t paddingLength = 0;
if(*frameCount == 0){
// log_i("code3 v %i", inbuf[1] & 0x80);
bool v = ((inbuf[1] & 0x80) == 0x80); // VBR indicator
if(v != 0) {log_e("OPUS countCode 3 with VBR not supported yet"); vTaskDelay(1000);} // todo
bool p = ((inbuf[1] & 0x40) == 0x40); // padding bit
M = inbuf[1] & 0x3F; // max framecount
// log_i("v %i, p %i, M %i", v, p, M);
*frameCount = inbuf[1] & 0x3F; // max framecount
*bytesLeft -= 2;
s_opusCurrentFilePos += 2;
len -= 2;
packetLen -= 2;
inbuf += 2;
if(p){
paddingBytes = 0;
paddingLength = 1;
int i = 0;
while(inbuf[i] == 255){
paddingBytes += inbuf[i];
......@@ -276,38 +526,30 @@ FramePacking: // https://www.tech-invite.com/y65/tinv-ietf-rfc-6716-2
}
paddingBytes += inbuf[i];
paddingLength += i;
*bytesLeft -= paddingLength;
s_opusCurrentFilePos += paddingLength;
len -= paddingLength;
packetLen -= paddingLength;
inbuf += paddingLength;
}
fs = (len - paddingBytes) / M;
else{
paddingBytes = 0;
}
fs = (packetLen - paddingBytes) / *frameCount;
}
*bytesLeft -= fs;
s_opusCurrentFilePos += fs;
ec_dec_init((uint8_t *)inbuf, fs);
ret = celt_decode_with_ec(inbuf, fs, (int16_t*)outbuf, samplesPerFrame);
if(ret < 0) goto exit; // celt error
if(ret < 0) return ret; // celt error
s_opusValidSamples = ret;
M--;
// log_i("M %i fs %i spf %i", M, fs, samplesPerFrame);
ret = ERR_OPUS_NONE;
if(M == 0) {s_opusCountCode = 0; *bytesLeft -= paddingBytes; paddingBytes = 0; goto exit;}
return ret;
break;
default:
log_e("unknown countCode %i", s_opusCountCode);
break;
}
exit:
if(s_opusSegmentTableSize == 0){
s_opusSegmentTableRdPtr = -1; // back to the parking position
s_f_opusParseOgg = true;
}
return ret;
*frameCount -= 1;
if(*frameCount > 0) return OPUS_CONTINUE;
s_opusCountCode = 0;
*bytesLeft -= paddingBytes;
s_opusCurrentFilePos += paddingBytes;
paddingBytes = 0;
fs = 0;
return ERR_OPUS_NONE;
}
//----------------------------------------------------------------------------------------------------------------------
......@@ -368,7 +610,7 @@ vector<uint32_t> OPUSgetMetadataBlockPicture(){
}
//----------------------------------------------------------------------------------------------------------------------
int parseOpusTOC(uint8_t TOC_Byte){ // https://www.rfc-editor.org/rfc/rfc6716 page 16 ff
int8_t parseOpusTOC(uint8_t TOC_Byte){ // https://www.rfc-editor.org/rfc/rfc6716 page 16 ff
uint8_t configNr = 0;
uint8_t s = 0; // stereo flag
......
src/opus_decoder/opus_decoder.h
View file @ 384ba4d5
......@@ -8,7 +8,8 @@
#include <vector>
using namespace std;
enum : int8_t {OPUS_PARSE_OGG_DONE = 100,
enum : int8_t {OPUS_CONTINUE = 110,
OPUS_PARSE_OGG_DONE = 100,
ERR_OPUS_NONE = 0,
ERR_OPUS_CHANNELS_OUT_OF_RANGE = -1,
ERR_OPUS_INVALID_SAMPLERATE = -2,
......@@ -36,6 +37,10 @@ void OPUSDecoder_FreeBuffers();
void OPUSDecoder_ClearBuffers();
void OPUSsetDefaults();
int OPUSDecode(uint8_t* inbuf, int* bytesLeft, short* outbuf);
int8_t opus_FramePacking_Code0(uint8_t *inbuf, int *bytesLeft, short *outbuf, int packetLen, uint16_t samplesPerFrame);
int8_t opus_FramePacking_Code1(uint8_t *inbuf, int *bytesLeft, short *outbuf, int packetLen, uint16_t samplesPerFrame, uint8_t* frameCount);
int8_t opus_FramePacking_Code2(uint8_t *inbuf, int *bytesLeft, short *outbuf, int packetLen, uint16_t samplesPerFrame, uint8_t* frameCount);
int8_t opus_FramePacking_Code3(uint8_t *inbuf, int *bytesLeft, short *outbuf, int packetLen, uint16_t samplesPerFrame, uint8_t* frameCount);
uint8_t OPUSGetChannels();
uint32_t OPUSGetSampRate();
uint8_t OPUSGetBitsPerSample();
......@@ -47,7 +52,7 @@ int OPUSFindSyncWord(unsigned char* buf, int nBytes);
int OPUSparseOGG(uint8_t* inbuf, int* bytesLeft);
int parseOpusHead(uint8_t* inbuf, int nBytes);
int parseOpusComment(uint8_t* inbuf, int nBytes);
int parseOpusTOC(uint8_t TOC_Byte);
int8_t parseOpusTOC(uint8_t TOC_Byte);
int32_t opus_packet_get_samples_per_frame(const uint8_t* data, int32_t Fs);
// some helper functions
......
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