ref: 1ae06eab9162d40631fd415ac0742181b9ed47ef
dir: /module/gmp-openh264.cpp/
/*!
* \copy
* Copyright (c) 2009-2014, Cisco Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*
*************************************************************************************
*/
#include <stdint.h>
#include <time.h>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <memory>
#include <assert.h>
#include <limits.h>
#include "gmp-platform.h"
#include "gmp-video-host.h"
#include "gmp-video-encode.h"
#include "gmp-video-decode.h"
#include "gmp-video-frame-i420.h"
#include "gmp-video-frame-encoded.h"
#include "codec_def.h"
#include "codec_app_def.h"
#include "codec_api.h"
#include "task_utils.h"
#if defined(_MSC_VER)
#define PUBLIC_FUNC __declspec(dllexport)
#else
#define PUBLIC_FUNC
#endif
// This is for supporting older versions which do not have support for nullptr.
#if defined(nullptr)
# define GMP_HAVE_NULLPTR
#elif defined(__clang__)
# ifndef __has_extension
# define __has_extension __has_feature
# endif
# if __has_extension(cxx_nullptr)
# define GMP_HAVE_NULLPTR
# endif
#elif defined(__GNUC__)
# if defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L
# if (__GNU_C__ >=4)
# if (__GNU_C_MINOR__ >= 6)
# define GMP_HAVE_NULLPTR
# endif
# endif
# endif
#elif defined(_MSC_VER)
# define GMP_HAVE_NULLPTR
#endif
#if !defined (GMP_HAVE_NULLPTR)
# define nullptr __null
#endif
static int g_log_level = 0;
#define GMPLOG(l, x) do { \
if (l <= g_log_level) { \
const char *log_string = "unknown"; \
if ((l >= 0) && (l <= 3)) { \
log_string = kLogStrings[l]; \
} \
std::cerr << log_string << ": " << x << std::endl; \
} \
} while(0)
#define GL_CRIT 0
#define GL_ERROR 1
#define GL_INFO 2
#define GL_DEBUG 3
const char* kLogStrings[] = {
"Critical",
"Error",
"Info",
"Debug"
};
static GMPPlatformAPI* g_platform_api = nullptr;
class OpenH264VideoEncoder;
template <typename T> class SelfDestruct {
public:
SelfDestruct (T* t) : t_ (t) {}
~SelfDestruct() {
if (t_) {
t_->Destroy();
}
}
T* forget() {
T* t = t_;
t_ = nullptr;
return t;
}
private:
T* t_;
};
class FrameStats {
public:
FrameStats (const char* type) :
frames_in_ (0),
frames_out_ (0),
start_time_ (time (0)),
last_time_ (start_time_),
type_ (type) {}
void FrameIn() {
++frames_in_;
time_t now = time (0);
if (now == last_time_) {
return;
}
if (! (frames_in_ % 10)) {
GMPLOG (GL_INFO, type_ << ": " << now << " Frame count "
<< frames_in_
<< "(" << (frames_in_ / (now - start_time_)) << "/"
<< (30 / (now - last_time_)) << ")"
<< " -- " << frames_out_);
last_time_ = now;
}
}
void FrameOut() {
++frames_out_;
}
private:
uint64_t frames_in_;
uint64_t frames_out_;
time_t start_time_;
time_t last_time_;
const std::string type_;
};
class OpenH264VideoEncoder : public GMPVideoEncoder {
public:
OpenH264VideoEncoder (GMPVideoHost* hostAPI) :
host_ (hostAPI),
worker_thread_ (nullptr),
encoder_ (nullptr),
max_payload_size_ (0),
callback_ (nullptr),
stats_ ("Encoder") {}
virtual ~OpenH264VideoEncoder() {
worker_thread_->Join();
}
virtual void InitEncode (const GMPVideoCodec& codecSettings,
const uint8_t* aCodecSpecific,
uint32_t aCodecSpecificSize,
GMPVideoEncoderCallback* callback,
int32_t numberOfCores,
uint32_t maxPayloadSize) {
callback_ = callback;
GMPErr err = g_platform_api->createthread (&worker_thread_);
if (err != GMPNoErr) {
GMPLOG (GL_ERROR, "Couldn't create new thread");
Error (GMPGenericErr);
return;
}
int rv = WelsCreateSVCEncoder (&encoder_);
if (rv) {
Error (GMPGenericErr);
return;
}
SEncParamExt param;
memset (¶m, 0, sizeof (param));
encoder_->GetDefaultParams (¶m);
GMPLOG (GL_INFO, "Initializing encoder at "
<< codecSettings.mWidth
<< "x"
<< codecSettings.mHeight
<< "@"
<< static_cast<int> (codecSettings.mMaxFramerate));
// Translate parameters.
param.iUsageType = CAMERA_VIDEO_REAL_TIME;
param.iPicWidth = codecSettings.mWidth;
param.iPicHeight = codecSettings.mHeight;
param.iRCMode = RC_BITRATE_MODE;
param.iTargetBitrate = codecSettings.mStartBitrate * 1000;
param.iMaxBitrate = codecSettings.mMaxBitrate * 1000;
GMPLOG (GL_INFO, "Initializing Bit Rate at: Start: "
<< codecSettings.mStartBitrate
<< "; Min: "
<< codecSettings.mMinBitrate
<< "; Max: "
<< codecSettings.mMaxBitrate
<< "; Max payload size:"
<< maxPayloadSize);
param.uiMaxNalSize = maxPayloadSize;
// TODO(ekr@rtfm.com). Scary conversion from unsigned char to float below.
param.fMaxFrameRate = static_cast<float> (codecSettings.mMaxFramerate);
// Set up layers. Currently we have one layer.
SSpatialLayerConfig* layer = ¶m.sSpatialLayers[0];
layer->iVideoWidth = codecSettings.mWidth;
layer->iVideoHeight = codecSettings.mHeight;
layer->fFrameRate = param.fMaxFrameRate;
layer->iSpatialBitrate = param.iTargetBitrate;
layer->iMaxSpatialBitrate = param.iMaxBitrate;
//for controlling the NAL size (normally for packetization-mode=0)
if (maxPayloadSize != 0) {
layer->sSliceCfg.uiSliceMode = SM_DYN_SLICE;
layer->sSliceCfg.sSliceArgument.uiSliceSizeConstraint = maxPayloadSize;
}
rv = encoder_->InitializeExt (¶m);
if (rv) {
GMPLOG (GL_ERROR, "Couldn't initialize encoder");
Error (GMPGenericErr);
return;
}
max_payload_size_ = maxPayloadSize;
GMPLOG (GL_INFO, "Initialized encoder");
}
virtual void Encode (GMPVideoi420Frame* inputImage,
const uint8_t* aCodecSpecificInfo,
uint32_t aCodecSpecificInfoLength,
const GMPVideoFrameType* aFrameTypes,
uint32_t aFrameTypesLength) {
GMPLOG (GL_DEBUG,
__FUNCTION__
<< " size="
<< inputImage->Width() << "x" << inputImage->Height());
stats_.FrameIn();
assert (aFrameTypesLength != 0);
worker_thread_->Post (WrapTask (
this, &OpenH264VideoEncoder::Encode_w,
inputImage,
(aFrameTypes)[0]));
}
virtual void SetChannelParameters (uint32_t aPacketLoss, uint32_t aRTT) {
}
virtual void SetRates (uint32_t aNewBitRate, uint32_t aFrameRate) {
GMPLOG (GL_INFO, "[SetRates] Begin with: "
<< aNewBitRate << " , " << aFrameRate);
//update bitrate if needed
const int32_t newBitRate = aNewBitRate * 1000; //kbps->bps
SBitrateInfo existEncoderBitRate;
existEncoderBitRate.iLayer = SPATIAL_LAYER_ALL;
int rv = encoder_->GetOption (ENCODER_OPTION_BITRATE, &existEncoderBitRate);
if (rv != cmResultSuccess) {
GMPLOG (GL_ERROR, "[SetRates] Error in Getting Bit Rate at Layer:"
<< rv
<< " ; Layer = "
<< existEncoderBitRate.iLayer
<< " ; BR = "
<< existEncoderBitRate.iBitrate);
Error (GMPGenericErr);
return;
}
if (rv == cmResultSuccess && existEncoderBitRate.iBitrate != newBitRate) {
SBitrateInfo newEncoderBitRate;
newEncoderBitRate.iLayer = SPATIAL_LAYER_ALL;
newEncoderBitRate.iBitrate = newBitRate;
rv = encoder_->SetOption (ENCODER_OPTION_BITRATE, &newEncoderBitRate);
if (rv == cmResultSuccess) {
GMPLOG (GL_INFO, "[SetRates] Update Encoder Bandwidth (AllLayers): ReturnValue: "
<< rv
<< "BitRate(kbps): "
<< aNewBitRate);
} else {
GMPLOG (GL_ERROR, "[SetRates] Error in Setting Bit Rate at Layer:"
<< rv
<< " ; Layer = "
<< newEncoderBitRate.iLayer
<< " ; BR = "
<< newEncoderBitRate.iBitrate);
Error (GMPGenericErr);
return;
}
}
//update framerate if needed
float existFrameRate = 0;
rv = encoder_->GetOption (ENCODER_OPTION_FRAME_RATE, &existFrameRate);
if (rv != cmResultSuccess) {
GMPLOG (GL_ERROR, "[SetRates] Error in Getting Frame Rate:"
<< rv << " FrameRate: " << existFrameRate);
Error (GMPGenericErr);
return;
}
if (rv == cmResultSuccess &&
(aFrameRate - existFrameRate > 0.001f ||
existFrameRate - aFrameRate > 0.001f)) {
float newFrameRate = static_cast<float> (aFrameRate);
rv = encoder_->SetOption (ENCODER_OPTION_FRAME_RATE, &newFrameRate);
if (rv == cmResultSuccess) {
GMPLOG (GL_INFO, "[SetRates] Update Encoder Frame Rate: ReturnValue: "
<< rv << " FrameRate: " << aFrameRate);
} else {
GMPLOG (GL_ERROR, "[SetRates] Error in Setting Frame Rate: ReturnValue: "
<< rv << " FrameRate: " << aFrameRate);
Error (GMPGenericErr);
return;
}
}
}
virtual void SetPeriodicKeyFrames (bool aEnable) {
}
virtual void EncodingComplete() {
delete this;
}
private:
void Error (GMPErr error) {
if (callback_) {
callback_->Error (error);
}
}
void Encode_w (GMPVideoi420Frame* inputImage,
GMPVideoFrameType frame_type) {
SFrameBSInfo encoded;
if (frame_type == kGMPKeyFrame) {
encoder_->ForceIntraFrame (true);
if (!inputImage)
return;
}
if (!inputImage) {
GMPLOG (GL_ERROR, "no input image");
return;
}
SSourcePicture src;
src.iColorFormat = videoFormatI420;
src.iStride[0] = inputImage->Stride (kGMPYPlane);
src.pData[0] = reinterpret_cast<unsigned char*> (
const_cast<uint8_t*> (inputImage->Buffer (kGMPYPlane)));
src.iStride[1] = inputImage->Stride (kGMPUPlane);
src.pData[1] = reinterpret_cast<unsigned char*> (
const_cast<uint8_t*> (inputImage->Buffer (kGMPUPlane)));
src.iStride[2] = inputImage->Stride (kGMPVPlane);
src.pData[2] = reinterpret_cast<unsigned char*> (
const_cast<uint8_t*> (inputImage->Buffer (kGMPVPlane)));
src.iStride[3] = 0;
src.pData[3] = nullptr;
src.iPicWidth = inputImage->Width();
src.iPicHeight = inputImage->Height();
src.uiTimeStamp = inputImage->Timestamp() / 1000; //encoder needs millisecond
const SSourcePicture* pics = &src;
int result = encoder_->EncodeFrame (pics, &encoded);
if (result != cmResultSuccess) {
GMPLOG (GL_ERROR, "Couldn't encode frame. Error = " << result);
}
// Translate int to enum
GMPVideoFrameType encoded_type;
bool has_frame = false;
switch (encoded.eFrameType) {
case videoFrameTypeIDR:
encoded_type = kGMPKeyFrame;
has_frame = true;
break;
case videoFrameTypeI:
encoded_type = kGMPKeyFrame;
has_frame = true;
break;
case videoFrameTypeP:
encoded_type = kGMPDeltaFrame;
has_frame = true;
break;
case videoFrameTypeSkip:
// Can skip the call back since no actual bitstream will be generated
break;
case videoFrameTypeIPMixed://this type is currently not suppported
case videoFrameTypeInvalid:
GMPLOG (GL_ERROR, "Couldn't encode frame. Type = "
<< encoded.eFrameType);
break;
default:
// The API is defined as returning a type.
assert (false);
break;
}
if (!has_frame) {
// This frame must be destroyed on the main thread.
g_platform_api->syncrunonmainthread (WrapTask (
this,
&OpenH264VideoEncoder::DestroyInputFrame_m,
inputImage));
return;
}
// Synchronously send this back to the main thread for delivery.
g_platform_api->syncrunonmainthread (WrapTask (
this,
&OpenH264VideoEncoder::Encode_m,
inputImage,
&encoded,
encoded_type));
}
void Encode_m (GMPVideoi420Frame* frame, SFrameBSInfo* encoded,
GMPVideoFrameType frame_type) {
// Now return the encoded data back to the parent.
GMPVideoFrame* ftmp;
GMPErr err = host_->CreateFrame (kGMPEncodedVideoFrame, &ftmp);
if (err != GMPNoErr) {
GMPLOG (GL_ERROR, "Error creating encoded frame");
frame->Destroy();
return;
}
GMPVideoEncodedFrame* f = static_cast<GMPVideoEncodedFrame*> (ftmp);
// Buffer up the data.
uint32_t length = 0;
std::vector<uint32_t> lengths;
for (int i = 0; i < encoded->iLayerNum; ++i) {
lengths.push_back (0);
uint8_t* tmp = encoded->sLayerInfo[i].pBsBuf;
for (int j = 0; j < encoded->sLayerInfo[i].iNalCount; ++j) {
lengths[i] += encoded->sLayerInfo[i].pNalLengthInByte[j];
// Convert from 4-byte start codes to GMP_BufferLength32 (NAL lengths)
assert (* (reinterpret_cast<uint32_t*> (tmp)) == 0x01000000);
// BufferType32 doesn't include the length of the length itself!
* (reinterpret_cast<uint32_t*> (tmp)) = encoded->sLayerInfo[i].pNalLengthInByte[j] - sizeof (uint32_t);
length += encoded->sLayerInfo[i].pNalLengthInByte[j];
tmp += encoded->sLayerInfo[i].pNalLengthInByte[j];
}
}
err = f->CreateEmptyFrame (length);
if (err != GMPNoErr) {
GMPLOG (GL_ERROR, "Error allocating frame data");
f->Destroy();
frame->Destroy();
return;
}
// Copy the data.
// Here we concatenate into one big buffer
uint8_t* tmp = f->Buffer();
for (int i = 0; i < encoded->iLayerNum; ++i) {
memcpy (tmp, encoded->sLayerInfo[i].pBsBuf, lengths[i]);
tmp += lengths[i];
}
f->SetEncodedWidth (frame->Width());
f->SetEncodedHeight (frame->Height());
f->SetTimeStamp (frame->Timestamp());
f->SetFrameType (frame_type);
f->SetCompleteFrame (true);
f->SetBufferType (GMP_BufferLength32);
GMPLOG (GL_DEBUG, "Encoding complete. type= "
<< f->FrameType()
<< " length="
<< f->Size()
<< " timestamp="
<< f->TimeStamp());
// Destroy the frame.
frame->Destroy();
// Return the encoded frame.
GMPCodecSpecificInfo info;
memset (&info, 0, sizeof (info)); // shouldn't be needed, we init everything
info.mCodecType = kGMPVideoCodecH264;
info.mBufferType = GMP_BufferLength32;
info.mCodecSpecific.mH264.mSimulcastIdx = 0;
callback_->Encoded (f, reinterpret_cast<uint8_t*> (&info), sizeof (info));
stats_.FrameOut();
}
// These frames must be destroyed on the main thread.
void DestroyInputFrame_m (GMPVideoi420Frame* frame) {
frame->Destroy();
}
private:
GMPVideoHost* host_;
GMPThread* worker_thread_;
ISVCEncoder* encoder_;
uint32_t max_payload_size_;
GMPVideoEncoderCallback* callback_;
FrameStats stats_;
};
class OpenH264VideoDecoder : public GMPVideoDecoder {
public:
OpenH264VideoDecoder (GMPVideoHost* hostAPI) :
host_ (hostAPI),
worker_thread_ (nullptr),
callback_ (nullptr),
decoder_ (nullptr),
stats_ ("Decoder") {}
virtual ~OpenH264VideoDecoder() {
}
virtual void InitDecode (const GMPVideoCodec& codecSettings,
const uint8_t* aCodecSpecific,
uint32_t aCodecSpecificSize,
GMPVideoDecoderCallback* callback,
int32_t coreCount) {
callback_ = callback;
GMPLOG (GL_INFO, "InitDecode");
GMPErr err = g_platform_api->createthread (&worker_thread_);
if (err != GMPNoErr) {
GMPLOG (GL_ERROR, "Couldn't create new thread");
Error (GMPGenericErr);
return;
}
if (WelsCreateDecoder (&decoder_)) {
GMPLOG (GL_ERROR, "Couldn't create decoder");
Error (GMPGenericErr);
return;
}
if (!decoder_) {
GMPLOG (GL_ERROR, "Couldn't create decoder");
Error (GMPGenericErr);
return;
}
SDecodingParam param;
memset (¶m, 0, sizeof (param));
param.eOutputColorFormat = videoFormatI420;
param.uiTargetDqLayer = UCHAR_MAX; // Default value
param.eEcActiveIdc = ERROR_CON_SLICE_MV_COPY_CROSS_IDR_FREEZE_RES_CHANGE; // Error concealment on.
param.sVideoProperty.eVideoBsType = VIDEO_BITSTREAM_DEFAULT;
if (decoder_->Initialize (¶m)) {
GMPLOG (GL_ERROR, "Couldn't initialize decoder");
Error (GMPGenericErr);
return;
}
}
virtual void Decode (GMPVideoEncodedFrame* inputFrame,
bool missingFrames,
const uint8_t* aCodecSpecificInfo,
uint32_t aCodecSpecificInfoLength,
int64_t renderTimeMs = -1) {
GMPLOG (GL_DEBUG, __FUNCTION__
<< "Decoding frame size=" << inputFrame->Size()
<< " timestamp=" << inputFrame->TimeStamp());
stats_.FrameIn();
//const GMPCodecSpecificInfo *codecSpecificInfo = (GMPCodecSpecificInfo) aCodecSpecificInfo;
// Convert to H.264 start codes
switch (inputFrame->BufferType()) {
case GMP_BufferSingle:
case GMP_BufferLength8:
case GMP_BufferLength16:
case GMP_BufferLength24:
// We should look to support these, especially GMP_BufferSingle
assert (false);
break;
case GMP_BufferLength32: {
uint8_t* start_code = inputFrame->Buffer();
// start code should be at least four bytes from the end or we risk
// reading/writing outside the buffer.
while (start_code < inputFrame->Buffer() + inputFrame->Size() - 4) {
static const uint8_t code[] = { 0x00, 0x00, 0x00, 0x01 };
uint8_t* lenp = start_code;
start_code += * (reinterpret_cast<int32_t*> (lenp));
memcpy (lenp, code, 4);
}
}
break;
default:
assert (false);
break;
}
DECODING_STATE dState = dsErrorFree;
worker_thread_->Post (WrapTask (
this, &OpenH264VideoDecoder::Decode_w,
inputFrame,
missingFrames,
dState,
renderTimeMs));
if (dState) {
Error (GMPGenericErr);
}
}
virtual void Reset() {
}
virtual void Drain() {
}
virtual void DecodingComplete() {
delete this;
}
private:
void Error (GMPErr error) {
if (callback_) {
callback_->Error (error);
}
}
void Decode_w (GMPVideoEncodedFrame* inputFrame,
bool missingFrames,
DECODING_STATE& dState,
int64_t renderTimeMs = -1) {
GMPLOG (GL_DEBUG, "Frame decode on worker thread length = "
<< inputFrame->Size());
SBufferInfo decoded;
bool valid = false;
memset (&decoded, 0, sizeof (decoded));
unsigned char* data[3] = {nullptr, nullptr, nullptr};
dState = decoder_->DecodeFrameNoDelay (inputFrame->Buffer(),
inputFrame->Size(),
data,
&decoded);
if (dState) {
GMPLOG (GL_ERROR, "Decoding error dState=" << dState);
} else {
valid = true;
}
g_platform_api->syncrunonmainthread (WrapTask (
this,
&OpenH264VideoDecoder::Decode_m,
inputFrame,
&decoded,
data,
renderTimeMs,
valid));
}
// Return the decoded data back to the parent.
void Decode_m (GMPVideoEncodedFrame* inputFrame,
SBufferInfo* decoded,
unsigned char* data[3],
int64_t renderTimeMs,
bool valid) {
// Attach a self-destructor so that this dies on return.
SelfDestruct<GMPVideoEncodedFrame> ifd (inputFrame);
// If we don't actually have data, just abort.
if (!valid) {
Error (GMPDecodeErr);
return;
}
if (decoded->iBufferStatus != 1) {
return;
}
int width = decoded->UsrData.sSystemBuffer.iWidth;
int height = decoded->UsrData.sSystemBuffer.iHeight;
int ystride = decoded->UsrData.sSystemBuffer.iStride[0];
int uvstride = decoded->UsrData.sSystemBuffer.iStride[1];
GMPLOG (GL_DEBUG, "Video frame ready for display "
<< width
<< "x"
<< height
<< " timestamp="
<< inputFrame->TimeStamp());
GMPVideoFrame* ftmp = nullptr;
// Translate the image.
GMPErr err = host_->CreateFrame (kGMPI420VideoFrame, &ftmp);
if (err != GMPNoErr) {
GMPLOG (GL_ERROR, "Couldn't allocate empty I420 frame");
return;
}
GMPVideoi420Frame* frame = static_cast<GMPVideoi420Frame*> (ftmp);
err = frame->CreateFrame (
ystride * height, static_cast<uint8_t*> (data[0]),
uvstride * height / 2, static_cast<uint8_t*> (data[1]),
uvstride * height / 2, static_cast<uint8_t*> (data[2]),
width, height,
ystride, uvstride, uvstride);
if (err != GMPNoErr) {
GMPLOG (GL_ERROR, "Couldn't make decoded frame");
return;
}
GMPLOG (GL_DEBUG, "Allocated size = "
<< frame->AllocatedSize (kGMPYPlane));
frame->SetTimestamp (inputFrame->TimeStamp());
frame->SetDuration (inputFrame->Duration());
callback_->Decoded (frame);
stats_.FrameOut();
}
GMPVideoHost* host_;
GMPThread* worker_thread_;
GMPVideoDecoderCallback* callback_;
ISVCDecoder* decoder_;
FrameStats stats_;
};
extern "C" {
PUBLIC_FUNC GMPErr
GMPInit (GMPPlatformAPI* aPlatformAPI) {
g_platform_api = aPlatformAPI;
return GMPNoErr;
}
PUBLIC_FUNC GMPErr
GMPGetAPI (const char* aApiName, void* aHostAPI, void** aPluginApi) {
if (!strcmp (aApiName, "decode-video")) {
*aPluginApi = new OpenH264VideoDecoder (static_cast<GMPVideoHost*> (aHostAPI));
return GMPNoErr;
} else if (!strcmp (aApiName, "encode-video")) {
*aPluginApi = new OpenH264VideoEncoder (static_cast<GMPVideoHost*> (aHostAPI));
return GMPNoErr;
}
return GMPGenericErr;
}
PUBLIC_FUNC void
GMPShutdown (void) {
g_platform_api = nullptr;
}
} // extern "C"