freerdp/libfreerdp/codec/h264_mediacodec.c

648 lines
20 KiB
C
Raw Normal View History

2023-05-09 21:29:50 +00:00
/**
* FreeRDP: A Remote Desktop Protocol Implementation
* H.264 Bitmap Compression
*
* Copyright 2022 Ely Ronnen <elyronnen@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <winpr/wlog.h>
#include <winpr/assert.h>
#include <winpr/library.h>
#include <freerdp/log.h>
#include <freerdp/codec/h264.h>
#include <media/NdkMediaCodec.h>
#include <media/NdkMediaFormat.h>
#include "h264.h"
#define RESOLVE_MEDIANDK_FUNC(sys, name) \
({ \
BOOL rc = TRUE; \
sys->fn##name = GetProcAddress(sys->mediandkLibrary, #name); \
if (sys->fn##name == NULL) \
{ \
WLog_Print(h264->log, WLOG_ERROR, \
"Error resolving function " #name " from libmediandk.so"); \
rc = FALSE; \
} \
rc; \
})
#define RESOLVE_MEDIANDK_VARIABLE(sys, member, exported) \
({ \
BOOL rc = FALSE; \
const char** temp = GetProcAddress(sys->mediandkLibrary, exported); \
if (temp == NULL) \
{ \
WLog_Print(h264->log, WLOG_ERROR, \
"Error resolving variable " exported " from libmediandk.so"); \
} \
else \
{ \
sys->member = *temp; \
rc = TRUE; \
} \
rc; \
})
typedef AMediaFormat* (*AMediaFormat_new_t)(void);
typedef media_status_t (*AMediaFormat_delete_t)(AMediaFormat*);
typedef const char* (*AMediaFormat_toString_t)(AMediaFormat*);
typedef void (*AMediaFormat_setInt32_t)(AMediaFormat*, const char*, int32_t);
typedef void (*AMediaFormat_setString_t)(AMediaFormat*, const char*, const char*);
typedef AMediaCodec* (*AMediaCodec_createDecoderByType_t)(const char*);
typedef media_status_t (*AMediaCodec_delete_t)(AMediaCodec*);
typedef media_status_t (*AMediaCodec_configure_t)(AMediaCodec*, const AMediaFormat*, ANativeWindow*,
AMediaCrypto*, uint32_t);
typedef media_status_t (*AMediaCodec_start_t)(AMediaCodec*);
typedef media_status_t (*AMediaCodec_stop_t)(AMediaCodec*);
typedef uint8_t* (*AMediaCodec_getInputBuffer_t)(AMediaCodec*, size_t, size_t*);
typedef uint8_t* (*AMediaCodec_getOutputBuffer_t)(AMediaCodec*, size_t, size_t*);
typedef ssize_t (*AMediaCodec_dequeueInputBuffer_t)(AMediaCodec*, int64_t);
typedef media_status_t (*AMediaCodec_queueInputBuffer_t)(AMediaCodec*, size_t, ssize_t, size_t,
uint64_t, uint32_t);
typedef ssize_t (*AMediaCodec_dequeueOutputBuffer_t)(AMediaCodec*, AMediaCodecBufferInfo*, int64_t);
typedef AMediaFormat* (*AMediaCodec_getOutputFormat_t)(AMediaCodec*);
typedef media_status_t (*AMediaCodec_releaseOutputBuffer_t)(AMediaCodec*, size_t, bool);
typedef media_status_t (*AMediaCodec_setParameters_t)(AMediaCodec*, const AMediaFormat*); // 26
typedef media_status_t (*AMediaCodec_getName_t)(AMediaCodec*, char**); // 28
typedef void (*AMediaCodec_releaseName_t)(AMediaCodec*, char*); // 28
typedef AMediaFormat* (*AMediaCodec_getInputFormat_t)(AMediaCodec*); // 28
const int COLOR_FormatYUV420Planar = 19;
const int COLOR_FormatYUV420Flexible = 0x7f420888;
struct _H264_CONTEXT_MEDIACODEC
{
AMediaCodec* decoder;
AMediaFormat* inputFormat;
AMediaFormat* outputFormat;
int32_t width;
int32_t height;
ssize_t currentOutputBufferIndex;
// libmediandk.so imports
HMODULE mediandkLibrary;
AMediaFormat_new_t fnAMediaFormat_new;
AMediaFormat_delete_t fnAMediaFormat_delete;
AMediaFormat_toString_t fnAMediaFormat_toString;
AMediaFormat_setInt32_t fnAMediaFormat_setInt32;
AMediaFormat_setString_t fnAMediaFormat_setString;
AMediaCodec_createDecoderByType_t fnAMediaCodec_createDecoderByType;
AMediaCodec_delete_t fnAMediaCodec_delete;
AMediaCodec_configure_t fnAMediaCodec_configure;
AMediaCodec_start_t fnAMediaCodec_start;
AMediaCodec_stop_t fnAMediaCodec_stop;
AMediaCodec_getInputBuffer_t fnAMediaCodec_getInputBuffer;
AMediaCodec_getOutputBuffer_t fnAMediaCodec_getOutputBuffer;
AMediaCodec_dequeueInputBuffer_t fnAMediaCodec_dequeueInputBuffer;
AMediaCodec_queueInputBuffer_t fnAMediaCodec_queueInputBuffer;
AMediaCodec_dequeueOutputBuffer_t fnAMediaCodec_dequeueOutputBuffer;
AMediaCodec_getOutputFormat_t fnAMediaCodec_getOutputFormat;
AMediaCodec_releaseOutputBuffer_t fnAMediaCodec_releaseOutputBuffer;
AMediaCodec_setParameters_t fnAMediaCodec_setParameters;
AMediaCodec_getName_t fnAMediaCodec_getName;
AMediaCodec_releaseName_t fnAMediaCodec_releaseName;
AMediaCodec_getInputFormat_t fnAMediaCodec_getInputFormat;
const char* gAMediaFormatKeyMime;
const char* gAMediaFormatKeyWidth;
const char* gAMediaFormatKeyHeight;
const char* gAMediaFormatKeyColorFormat;
};
typedef struct _H264_CONTEXT_MEDIACODEC H264_CONTEXT_MEDIACODEC;
static int load_libmediandk(H264_CONTEXT* h264)
{
BOOL rc;
H264_CONTEXT_MEDIACODEC* sys;
WINPR_ASSERT(h264);
sys = (H264_CONTEXT_MEDIACODEC*)h264->pSystemData;
WINPR_ASSERT(sys);
WLog_Print(h264->log, WLOG_DEBUG, "MediaCodec Loading libmediandk.so");
sys->mediandkLibrary = LoadLibraryA("libmediandk.so");
if (sys->mediandkLibrary == NULL)
{
WLog_Print(h264->log, WLOG_WARN, "Error loading libmediandk.so");
return -1;
}
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaFormat_new);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaFormat_delete);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaFormat_toString);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaFormat_setInt32);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaFormat_setString);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_createDecoderByType);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_delete);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_configure);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_start);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_stop);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_getInputBuffer);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_getOutputBuffer);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_dequeueInputBuffer);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_queueInputBuffer);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_dequeueOutputBuffer);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_getOutputFormat);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_releaseOutputBuffer);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_setParameters);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_getName);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_releaseName);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_FUNC(sys, AMediaCodec_getInputFormat);
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_VARIABLE(sys, gAMediaFormatKeyMime, "AMEDIAFORMAT_KEY_MIME");
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_VARIABLE(sys, gAMediaFormatKeyWidth, "AMEDIAFORMAT_KEY_WIDTH");
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_VARIABLE(sys, gAMediaFormatKeyHeight, "AMEDIAFORMAT_KEY_HEIGHT");
if (!rc)
return -1;
rc = RESOLVE_MEDIANDK_VARIABLE(sys, gAMediaFormatKeyColorFormat,
"AMEDIAFORMAT_KEY_COLOR_FORMAT");
if (!rc)
return -1;
return 0;
}
static void unload_libmediandk(H264_CONTEXT* h264)
{
H264_CONTEXT_MEDIACODEC* sys;
WINPR_ASSERT(h264);
sys = (H264_CONTEXT_MEDIACODEC*)h264->pSystemData;
WINPR_ASSERT(sys);
if (NULL == sys->mediandkLibrary)
{
return;
}
FreeLibrary(sys->mediandkLibrary);
}
static void set_mediacodec_format(H264_CONTEXT* h264, AMediaFormat** formatVariable,
AMediaFormat* newFormat)
{
media_status_t status = AMEDIA_OK;
H264_CONTEXT_MEDIACODEC* sys;
WINPR_ASSERT(h264);
WINPR_ASSERT(formatVariable);
sys = (H264_CONTEXT_MEDIACODEC*)h264->pSystemData;
WINPR_ASSERT(sys);
if (*formatVariable != NULL)
{
status = sys->fnAMediaFormat_delete(*formatVariable);
if (status != AMEDIA_OK)
{
WLog_Print(h264->log, WLOG_ERROR, "Error AMediaFormat_delete %d", status);
}
}
*formatVariable = newFormat;
}
static void release_current_outputbuffer(H264_CONTEXT* h264)
{
media_status_t status = AMEDIA_OK;
H264_CONTEXT_MEDIACODEC* sys;
WINPR_ASSERT(h264);
sys = (H264_CONTEXT_MEDIACODEC*)h264->pSystemData;
WINPR_ASSERT(sys);
if (sys->currentOutputBufferIndex < 0)
{
return;
}
status =
sys->fnAMediaCodec_releaseOutputBuffer(sys->decoder, sys->currentOutputBufferIndex, FALSE);
if (status != AMEDIA_OK)
{
WLog_Print(h264->log, WLOG_ERROR, "Error AMediaCodec_releaseOutputBuffer %d", status);
}
sys->currentOutputBufferIndex = -1;
}
static int mediacodec_compress(H264_CONTEXT* h264, const BYTE** pSrcYuv, const UINT32* pStride,
BYTE** ppDstData, UINT32* pDstSize)
{
WINPR_ASSERT(h264);
WINPR_ASSERT(pSrcYuv);
WINPR_ASSERT(pStride);
WINPR_ASSERT(ppDstData);
WINPR_ASSERT(pDstSize);
WLog_Print(h264->log, WLOG_ERROR, "MediaCodec is not supported as an encoder");
return -1;
}
static int mediacodec_decompress(H264_CONTEXT* h264, const BYTE* pSrcData, UINT32 SrcSize)
{
ssize_t inputBufferId = -1;
size_t inputBufferSize, outputBufferSize;
uint8_t* inputBuffer;
media_status_t status;
const char* media_format;
BYTE** pYUVData;
UINT32* iStride;
H264_CONTEXT_MEDIACODEC* sys;
WINPR_ASSERT(h264);
WINPR_ASSERT(pSrcData);
sys = (H264_CONTEXT_MEDIACODEC*)h264->pSystemData;
WINPR_ASSERT(sys);
pYUVData = h264->pYUVData;
WINPR_ASSERT(pYUVData);
iStride = h264->iStride;
WINPR_ASSERT(iStride);
release_current_outputbuffer(h264);
if (sys->width == 0)
{
int32_t width = h264->width;
int32_t height = h264->height;
if (width % 16 != 0)
width += 16 - width % 16;
if (height % 16 != 0)
height += 16 - height % 16;
WLog_Print(h264->log, WLOG_DEBUG, "MediaCodec setting width and height [%d,%d]", width,
height);
sys->fnAMediaFormat_setInt32(sys->inputFormat, sys->gAMediaFormatKeyWidth, width);
sys->fnAMediaFormat_setInt32(sys->inputFormat, sys->gAMediaFormatKeyHeight, height);
status = sys->fnAMediaCodec_setParameters(sys->decoder, sys->inputFormat);
if (status != AMEDIA_OK)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaCodec_setParameters failed: %d", status);
return -1;
}
sys->width = width;
sys->height = height;
}
while (true)
{
UINT32 inputBufferCurrnetOffset = 0;
while (inputBufferCurrnetOffset < SrcSize)
{
UINT32 numberOfBytesToCopy = SrcSize - inputBufferCurrnetOffset;
inputBufferId = sys->fnAMediaCodec_dequeueInputBuffer(sys->decoder, -1);
if (inputBufferId < 0)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaCodec_dequeueInputBuffer failed [%d]",
inputBufferId);
// TODO: sleep?
continue;
}
inputBuffer =
sys->fnAMediaCodec_getInputBuffer(sys->decoder, inputBufferId, &inputBufferSize);
if (inputBuffer == NULL)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaCodec_getInputBuffer failed");
return -1;
}
if (numberOfBytesToCopy > inputBufferSize)
{
WLog_Print(h264->log, WLOG_WARN,
"MediaCodec inputBufferSize: got [%d] but wanted [%d]", inputBufferSize,
numberOfBytesToCopy);
numberOfBytesToCopy = inputBufferSize;
}
memcpy(inputBuffer, pSrcData + inputBufferCurrnetOffset, numberOfBytesToCopy);
inputBufferCurrnetOffset += numberOfBytesToCopy;
status = sys->fnAMediaCodec_queueInputBuffer(sys->decoder, inputBufferId, 0,
numberOfBytesToCopy, 0, 0);
if (status != AMEDIA_OK)
{
WLog_Print(h264->log, WLOG_ERROR, "Error AMediaCodec_queueInputBuffer %d", status);
return -1;
}
}
while (true)
{
AMediaCodecBufferInfo bufferInfo;
ssize_t outputBufferId =
sys->fnAMediaCodec_dequeueOutputBuffer(sys->decoder, &bufferInfo, -1);
if (outputBufferId >= 0)
{
sys->currentOutputBufferIndex = outputBufferId;
uint8_t* outputBuffer;
outputBuffer = sys->fnAMediaCodec_getOutputBuffer(sys->decoder, outputBufferId,
&outputBufferSize);
sys->currentOutputBufferIndex = outputBufferId;
if (outputBufferSize != (sys->width * sys->height +
((sys->width + 1) / 2) * ((sys->height + 1) / 2) * 2))
{
WLog_Print(h264->log, WLOG_ERROR, "Error unexpected output buffer size %d",
outputBufferSize);
return -1;
}
// TODO: work with AImageReader and get AImage object instead of
// COLOR_FormatYUV420Planar buffer.
iStride[0] = sys->width;
iStride[1] = (sys->width + 1) / 2;
iStride[2] = (sys->width + 1) / 2;
pYUVData[0] = outputBuffer;
pYUVData[1] = outputBuffer + iStride[0] * sys->height;
pYUVData[2] =
outputBuffer + iStride[0] * sys->height + iStride[1] * ((sys->height + 1) / 2);
break;
}
else if (outputBufferId == AMEDIACODEC_INFO_OUTPUT_FORMAT_CHANGED)
{
AMediaFormat* outputFormat;
outputFormat = sys->fnAMediaCodec_getOutputFormat(sys->decoder);
if (outputFormat == NULL)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaCodec_getOutputFormat failed");
return -1;
}
set_mediacodec_format(h264, &sys->outputFormat, outputFormat);
media_format = sys->fnAMediaFormat_toString(sys->outputFormat);
if (media_format == NULL)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaFormat_toString failed");
return -1;
}
}
else if (outputBufferId == AMEDIACODEC_INFO_TRY_AGAIN_LATER)
{
WLog_Print(h264->log, WLOG_WARN,
"AMediaCodec_dequeueOutputBuffer need to try again later");
// TODO: sleep?
}
else if (outputBufferId == AMEDIACODEC_INFO_OUTPUT_BUFFERS_CHANGED)
{
WLog_Print(h264->log, WLOG_WARN,
"AMediaCodec_dequeueOutputBuffer returned deprecated value "
"AMEDIACODEC_INFO_OUTPUT_BUFFERS_CHANGED, ignoring");
}
else
{
WLog_Print(h264->log, WLOG_ERROR,
"AMediaCodec_dequeueOutputBuffer returned unknown value [%d]",
outputBufferId);
return -1;
}
}
break;
}
return 1;
}
static void mediacodec_uninit(H264_CONTEXT* h264)
{
media_status_t status = AMEDIA_OK;
H264_CONTEXT_MEDIACODEC* sys;
WINPR_ASSERT(h264);
sys = (H264_CONTEXT_MEDIACODEC*)h264->pSystemData;
WLog_Print(h264->log, WLOG_DEBUG, "Uninitializing MediaCodec");
if (!sys)
return;
if (sys->decoder != NULL)
{
release_current_outputbuffer(h264);
status = sys->fnAMediaCodec_stop(sys->decoder);
if (status != AMEDIA_OK)
{
WLog_Print(h264->log, WLOG_ERROR, "Error AMediaCodec_stop %d", status);
}
status = sys->fnAMediaCodec_delete(sys->decoder);
if (status != AMEDIA_OK)
{
WLog_Print(h264->log, WLOG_ERROR, "Error AMediaCodec_delete %d", status);
}
sys->decoder = NULL;
}
set_mediacodec_format(h264, &sys->inputFormat, NULL);
set_mediacodec_format(h264, &sys->outputFormat, NULL);
unload_libmediandk(h264);
free(sys);
h264->pSystemData = NULL;
}
static BOOL mediacodec_init(H264_CONTEXT* h264)
{
H264_CONTEXT_MEDIACODEC* sys;
media_status_t status;
const char* media_format;
char* codec_name;
AMediaFormat *inputFormat, *outputFormat;
WINPR_ASSERT(h264);
if (h264->Compressor)
{
WLog_Print(h264->log, WLOG_ERROR, "MediaCodec is not supported as an encoder");
goto EXCEPTION;
}
WLog_Print(h264->log, WLOG_DEBUG, "Initializing MediaCodec");
sys = (H264_CONTEXT_MEDIACODEC*)calloc(1, sizeof(H264_CONTEXT_MEDIACODEC));
if (!sys)
{
goto EXCEPTION;
}
h264->pSystemData = (void*)sys;
if (load_libmediandk(h264) < 0)
{
goto EXCEPTION;
}
sys->currentOutputBufferIndex = -1;
sys->width = sys->height = 0; // update when we're given the height and width
sys->decoder = sys->fnAMediaCodec_createDecoderByType("video/avc");
if (sys->decoder == NULL)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaCodec_createCodecByName failed");
goto EXCEPTION;
}
status = sys->fnAMediaCodec_getName(sys->decoder, &codec_name);
if (status != AMEDIA_OK)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaCodec_getName failed: %d", status);
goto EXCEPTION;
}
WLog_Print(h264->log, WLOG_DEBUG, "MediaCodec using video/avc codec [%s]", codec_name);
sys->fnAMediaCodec_releaseName(sys->decoder, codec_name);
sys->inputFormat = sys->fnAMediaFormat_new();
if (sys->inputFormat == NULL)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaFormat_new failed");
goto EXCEPTION;
}
sys->fnAMediaFormat_setString(sys->inputFormat, sys->gAMediaFormatKeyMime, "video/avc");
sys->fnAMediaFormat_setInt32(sys->inputFormat, sys->gAMediaFormatKeyWidth, sys->width);
sys->fnAMediaFormat_setInt32(sys->inputFormat, sys->gAMediaFormatKeyHeight, sys->height);
sys->fnAMediaFormat_setInt32(sys->inputFormat, sys->gAMediaFormatKeyColorFormat,
COLOR_FormatYUV420Planar);
media_format = sys->fnAMediaFormat_toString(sys->inputFormat);
if (media_format == NULL)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaFormat_toString failed");
goto EXCEPTION;
}
status = sys->fnAMediaCodec_configure(sys->decoder, sys->inputFormat, NULL, NULL, 0);
if (status != AMEDIA_OK)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaCodec_configure failed: %d", status);
goto EXCEPTION;
}
inputFormat = sys->fnAMediaCodec_getInputFormat(sys->decoder);
if (inputFormat == NULL)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaCodec_getInputFormat failed");
goto EXCEPTION;
}
set_mediacodec_format(h264, &sys->inputFormat, inputFormat);
media_format = sys->fnAMediaFormat_toString(sys->inputFormat);
if (media_format == NULL)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaFormat_toString failed");
goto EXCEPTION;
}
WLog_Print(h264->log, WLOG_DEBUG, "Using MediaCodec with input MediaFormat [%s]", media_format);
outputFormat = sys->fnAMediaCodec_getOutputFormat(sys->decoder);
if (outputFormat == NULL)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaCodec_getOutputFormat failed");
goto EXCEPTION;
}
set_mediacodec_format(h264, &sys->outputFormat, outputFormat);
media_format = sys->fnAMediaFormat_toString(sys->outputFormat);
if (media_format == NULL)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaFormat_toString failed");
goto EXCEPTION;
}
WLog_Print(h264->log, WLOG_DEBUG, "Using MediaCodec with output MediaFormat [%s]",
media_format);
WLog_Print(h264->log, WLOG_DEBUG, "Starting MediaCodec");
status = sys->fnAMediaCodec_start(sys->decoder);
if (status != AMEDIA_OK)
{
WLog_Print(h264->log, WLOG_ERROR, "AMediaCodec_start failed %d", status);
goto EXCEPTION;
}
return TRUE;
EXCEPTION:
mediacodec_uninit(h264);
return FALSE;
}
H264_CONTEXT_SUBSYSTEM g_Subsystem_mediacodec = { "MediaCodec", mediacodec_init, mediacodec_uninit,
mediacodec_decompress, mediacodec_compress };