void Inflator::ProcessInput(bool flush)
{
while (true)
{
switch (m_state)
{
case PRE_STREAM:
if (!flush && m_inQueue.CurrentSize() < MaxPrestreamHeaderSize())
return;
ProcessPrestreamHeader();
m_state = WAIT_HEADER;
m_wrappedAround = false;
m_current = 0;
m_lastFlush = 0;
m_window.New(1 << GetLog2WindowSize());
break;
case WAIT_HEADER:
{
// maximum number of bytes before actual compressed data starts
const size_t MAX_HEADER_SIZE = BitsToBytes(3+5+5+4+19*7+286*15+19*15);
if (m_inQueue.CurrentSize() < (flush ? 1 : MAX_HEADER_SIZE))
return;
DecodeHeader();
break;
}
case DECODING_BODY:
if (!DecodeBody())
return;
break;
case POST_STREAM:
if (!flush && m_inQueue.CurrentSize() < MaxPoststreamTailSize())
return;
ProcessPoststreamTail();
m_state = m_repeat ? PRE_STREAM : AFTER_END;
Output(0, NULL, 0, GetAutoSignalPropagation(), true); // TODO: non-blocking
if (m_inQueue.IsEmpty())
return;
break;
case AFTER_END:
m_inQueue.TransferTo(*AttachedTransformation());
return;
}
}
}
PRIVATE OI_STATUS internal_DecodeRaw(OI_CODEC_SBC_DECODER_CONTEXT *context,
OI_UINT8 bitpool,
const OI_BYTE **frameData,
OI_UINT32 *frameBytes,
OI_INT16 *pcmData,
OI_UINT32 *pcmBytes)
{
OI_STATUS status;
OI_UINT bodyLen;
TRACE(("+OI_CODEC_SBC_DecodeRaw"));
if (context->bufferedBlocks == 0) {
/*
* The bitallocator needs to know the bitpool value.
*/
context->common.frameInfo.bitpool = bitpool;
/*
* Compute the frame length and check we have enough frame data to proceed
*/
bodyLen = OI_CODEC_SBC_CalculateFramelen(&context->common.frameInfo) - SBC_HEADER_LEN;
if (*frameBytes < bodyLen) {
TRACE(("-OI_CODEC_SBC_Decode: OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA"));
return OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA;
}
} else {
bodyLen = 0;
}
/*
* Decode the SBC data. Pass TRUE to DecodeBody to allow partial decoding of
* tones.
*/
status = DecodeBody(context, *frameData, pcmData, pcmBytes, TRUE);
if (OI_SUCCESS(status) || status == OI_CODEC_SBC_PARTIAL_DECODE) {
*frameData += bodyLen;
*frameBytes -= bodyLen;
}
TRACE(("-OI_CODEC_SBC_DecodeRaw: %d", status));
return status;
}
OI_STATUS OI_CODEC_SBC_DecodeFrame(OI_CODEC_SBC_DECODER_CONTEXT *context,
const OI_BYTE **frameData,
OI_UINT32 *frameBytes,
OI_INT16 *pcmData,
OI_UINT32 *pcmBytes)
{
OI_STATUS status;
OI_UINT framelen;
OI_UINT8 crc;
TRACE(("+OI_CODEC_SBC_DecodeFrame"));
TRACE(("Finding syncword"));
status = FindSyncword(context, frameData, frameBytes);
if (!OI_SUCCESS(status)) {
return status;
}
/* Make sure enough data remains to read the header. */
if (*frameBytes < SBC_HEADER_LEN) {
TRACE(("-OI_CODEC_SBC_DecodeFrame: OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA"));
return OI_CODEC_SBC_NOT_ENOUGH_HEADER_DATA;
}
TRACE(("Reading Header"));
OI_SBC_ReadHeader(&context->common, *frameData);
/*
* Some implementations load the decoder into RAM and use overlays for 4 vs 8 subbands. We need
* to ensure that the SBC parameters for this frame are compatible with the restrictions imposed
* by the loaded overlays.
*/
if (context->limitFrameFormat && (context->common.frameInfo.subbands != context->restrictSubbands)) {
ERROR(("SBC parameters incompatible with loaded overlay"));
return OI_STATUS_INVALID_PARAMETERS;
}
if (context->common.frameInfo.nrof_channels > context->common.maxChannels) {
ERROR(("SBC parameters incompatible with number of channels specified during reset"));
return OI_STATUS_INVALID_PARAMETERS;
}
if (context->common.pcmStride < 1 || context->common.pcmStride > 2) {
ERROR(("PCM stride not set correctly during reset"));
return OI_STATUS_INVALID_PARAMETERS;
}
/*
* At this point a header has been read. However, it's possible that we found a false syncword,
* so the header data might be invalid. Make sure we have enough bytes to read in the
* CRC-protected header, but don't require we have the whole frame. That way, if it turns out
* that we're acting on bogus header data, we don't stall the decoding process by waiting for
* data that we don't actually need.
*/
framelen = OI_CODEC_SBC_CalculateFramelen(&context->common.frameInfo);
if (*frameBytes < framelen) {
TRACE(("-OI_CODEC_SBC_DecodeFrame: OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA"));
return OI_CODEC_SBC_NOT_ENOUGH_BODY_DATA;
}
TRACE(("Calculating checksum"));
crc = OI_SBC_CalculateChecksum(&context->common.frameInfo, *frameData);
if (crc != context->common.frameInfo.crc) {
TRACE(("CRC Mismatch: calc=%02x read=%02x\n", crc, context->common.frameInfo.crc));
TRACE(("-OI_CODEC_SBC_DecodeFrame: OI_CODEC_SBC_CHECKSUM_MISMATCH"));
return OI_CODEC_SBC_CHECKSUM_MISMATCH;
}
#ifdef OI_DEBUG
/*
* Make sure the bitpool values are sane.
*/
if ((context->common.frameInfo.bitpool < SBC_MIN_BITPOOL) && !context->common.frameInfo.enhanced) {
ERROR(("Bitpool too small: %d (must be >= 2)", context->common.frameInfo.bitpool));
return OI_STATUS_INVALID_PARAMETERS;
}
if (context->common.frameInfo.bitpool > OI_SBC_MaxBitpool(&context->common.frameInfo)) {
ERROR(("Bitpool too large: %d (must be <= %ld)", context->common.frameInfo.bitpool, OI_SBC_MaxBitpool(&context->common.frameInfo)));
return OI_STATUS_INVALID_PARAMETERS;
}
#endif
/*
* Now decode the SBC data. Partial decode is not yet implemented for an SBC
* stream, so pass FALSE to decode body to have it enforce the old rule that
* you have to decode a whole packet at a time.
*/
status = DecodeBody(context, *frameData + SBC_HEADER_LEN, pcmData, pcmBytes, FALSE);
if (OI_SUCCESS(status)) {
*frameData += framelen;
*frameBytes -= framelen;
}
TRACE(("-OI_CODEC_SBC_DecodeFrame: %d", status));
return status;
}
