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#include "CreateJavaOutputStreamAdaptor.h"
#include "SkJPEGWriteUtility.h"
#include "YuvToJpegEncoder.h"
#include <ui/PixelFormat.h>
#include <hardware/hardware.h>
#include "core_jni_helpers.h"
#include <jni.h>
YuvToJpegEncoder* YuvToJpegEncoder::create(int format, int* strides) {
// Only ImageFormat.NV21 and ImageFormat.YUY2 are supported
// for now.
if (format == HAL_PIXEL_FORMAT_YCrCb_420_SP) {
return new Yuv420SpToJpegEncoder(strides);
} else if (format == HAL_PIXEL_FORMAT_YCbCr_422_I) {
return new Yuv422IToJpegEncoder(strides);
} else {
return NULL;
}
}
YuvToJpegEncoder::YuvToJpegEncoder(int* strides) : fStrides(strides) {
}
struct ErrorMgr {
struct jpeg_error_mgr pub;
jmp_buf jmp;
};
void error_exit(j_common_ptr cinfo) {
ErrorMgr* err = (ErrorMgr*) cinfo->err;
(*cinfo->err->output_message) (cinfo);
longjmp(err->jmp, 1);
}
bool YuvToJpegEncoder::encode(SkWStream* stream, void* inYuv, int width,
int height, int* offsets, int jpegQuality) {
jpeg_compress_struct cinfo;
ErrorMgr err;
skjpeg_destination_mgr sk_wstream(stream);
cinfo.err = jpeg_std_error(&err.pub);
err.pub.error_exit = error_exit;
if (setjmp(err.jmp)) {
jpeg_destroy_compress(&cinfo);
return false;
}
jpeg_create_compress(&cinfo);
cinfo.dest = &sk_wstream;
setJpegCompressStruct(&cinfo, width, height, jpegQuality);
jpeg_start_compress(&cinfo, TRUE);
compress(&cinfo, (uint8_t*) inYuv, offsets);
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
return true;
}
void YuvToJpegEncoder::setJpegCompressStruct(jpeg_compress_struct* cinfo,
int width, int height, int quality) {
cinfo->image_width = width;
cinfo->image_height = height;
cinfo->input_components = 3;
cinfo->in_color_space = JCS_YCbCr;
jpeg_set_defaults(cinfo);
jpeg_set_quality(cinfo, quality, TRUE);
jpeg_set_colorspace(cinfo, JCS_YCbCr);
cinfo->raw_data_in = TRUE;
cinfo->dct_method = JDCT_IFAST;
configSamplingFactors(cinfo);
}
///////////////////////////////////////////////////////////////////
Yuv420SpToJpegEncoder::Yuv420SpToJpegEncoder(int* strides) :
YuvToJpegEncoder(strides) {
fNumPlanes = 2;
}
void Yuv420SpToJpegEncoder::compress(jpeg_compress_struct* cinfo,
uint8_t* yuv, int* offsets) {
SkDebugf("onFlyCompress");
JSAMPROW y[16];
JSAMPROW cb[8];
JSAMPROW cr[8];
JSAMPARRAY planes[3];
planes[0] = y;
planes[1] = cb;
planes[2] = cr;
int width = cinfo->image_width;
int height = cinfo->image_height;
uint8_t* yPlanar = yuv + offsets[0];
uint8_t* vuPlanar = yuv + offsets[1]; //width * height;
uint8_t* uRows = new uint8_t [8 * (width >> 1)];
uint8_t* vRows = new uint8_t [8 * (width >> 1)];
// process 16 lines of Y and 8 lines of U/V each time.
while (cinfo->next_scanline < cinfo->image_height) {
//deitnerleave u and v
deinterleave(vuPlanar, uRows, vRows, cinfo->next_scanline, width, height);
// Jpeg library ignores the rows whose indices are greater than height.
for (int i = 0; i < 16; i++) {
// y row
y[i] = yPlanar + (cinfo->next_scanline + i) * fStrides[0];
// construct u row and v row
if ((i & 1) == 0) {
// height and width are both halved because of downsampling
int offset = (i >> 1) * (width >> 1);
cb[i/2] = uRows + offset;
cr[i/2] = vRows + offset;
}
}
jpeg_write_raw_data(cinfo, planes, 16);
}
delete [] uRows;
delete [] vRows;
}
void Yuv420SpToJpegEncoder::deinterleave(uint8_t* vuPlanar, uint8_t* uRows,
uint8_t* vRows, int rowIndex, int width, int height) {
int numRows = (height - rowIndex) / 2;
if (numRows > 8) numRows = 8;
for (int row = 0; row < numRows; ++row) {
int offset = ((rowIndex >> 1) + row) * fStrides[1];
uint8_t* vu = vuPlanar + offset;
for (int i = 0; i < (width >> 1); ++i) {
int index = row * (width >> 1) + i;
uRows[index] = vu[1];
vRows[index] = vu[0];
vu += 2;
}
}
}
void Yuv420SpToJpegEncoder::configSamplingFactors(jpeg_compress_struct* cinfo) {
// cb and cr are horizontally downsampled and vertically downsampled as well.
cinfo->comp_info[0].h_samp_factor = 2;
cinfo->comp_info[0].v_samp_factor = 2;
cinfo->comp_info[1].h_samp_factor = 1;
cinfo->comp_info[1].v_samp_factor = 1;
cinfo->comp_info[2].h_samp_factor = 1;
cinfo->comp_info[2].v_samp_factor = 1;
}
///////////////////////////////////////////////////////////////////////////////
Yuv422IToJpegEncoder::Yuv422IToJpegEncoder(int* strides) :
YuvToJpegEncoder(strides) {
fNumPlanes = 1;
}
void Yuv422IToJpegEncoder::compress(jpeg_compress_struct* cinfo,
uint8_t* yuv, int* offsets) {
SkDebugf("onFlyCompress_422");
JSAMPROW y[16];
JSAMPROW cb[16];
JSAMPROW cr[16];
JSAMPARRAY planes[3];
planes[0] = y;
planes[1] = cb;
planes[2] = cr;
int width = cinfo->image_width;
int height = cinfo->image_height;
uint8_t* yRows = new uint8_t [16 * width];
uint8_t* uRows = new uint8_t [16 * (width >> 1)];
uint8_t* vRows = new uint8_t [16 * (width >> 1)];
uint8_t* yuvOffset = yuv + offsets[0];
// process 16 lines of Y and 16 lines of U/V each time.
while (cinfo->next_scanline < cinfo->image_height) {
deinterleave(yuvOffset, yRows, uRows, vRows, cinfo->next_scanline, width, height);
// Jpeg library ignores the rows whose indices are greater than height.
for (int i = 0; i < 16; i++) {
// y row
y[i] = yRows + i * width;
// construct u row and v row
// width is halved because of downsampling
int offset = i * (width >> 1);
cb[i] = uRows + offset;
cr[i] = vRows + offset;
}
jpeg_write_raw_data(cinfo, planes, 16);
}
delete [] yRows;
delete [] uRows;
delete [] vRows;
}
void Yuv422IToJpegEncoder::deinterleave(uint8_t* yuv, uint8_t* yRows, uint8_t* uRows,
uint8_t* vRows, int rowIndex, int width, int height) {
int numRows = height - rowIndex;
if (numRows > 16) numRows = 16;
for (int row = 0; row < numRows; ++row) {
uint8_t* yuvSeg = yuv + (rowIndex + row) * fStrides[0];
for (int i = 0; i < (width >> 1); ++i) {
int indexY = row * width + (i << 1);
int indexU = row * (width >> 1) + i;
yRows[indexY] = yuvSeg[0];
yRows[indexY + 1] = yuvSeg[2];
uRows[indexU] = yuvSeg[1];
vRows[indexU] = yuvSeg[3];
yuvSeg += 4;
}
}
}
void Yuv422IToJpegEncoder::configSamplingFactors(jpeg_compress_struct* cinfo) {
// cb and cr are horizontally downsampled and vertically downsampled as well.
cinfo->comp_info[0].h_samp_factor = 2;
cinfo->comp_info[0].v_samp_factor = 2;
cinfo->comp_info[1].h_samp_factor = 1;
cinfo->comp_info[1].v_samp_factor = 2;
cinfo->comp_info[2].h_samp_factor = 1;
cinfo->comp_info[2].v_samp_factor = 2;
}
///////////////////////////////////////////////////////////////////////////////
static jboolean YuvImage_compressToJpeg(JNIEnv* env, jobject, jbyteArray inYuv,
jint format, jint width, jint height, jintArray offsets,
jintArray strides, jint jpegQuality, jobject jstream,
jbyteArray jstorage) {
jbyte* yuv = env->GetByteArrayElements(inYuv, NULL);
SkWStream* strm = CreateJavaOutputStreamAdaptor(env, jstream, jstorage);
jint* imgOffsets = env->GetIntArrayElements(offsets, NULL);
jint* imgStrides = env->GetIntArrayElements(strides, NULL);
YuvToJpegEncoder* encoder = YuvToJpegEncoder::create(format, imgStrides);
jboolean result = JNI_FALSE;
if (encoder != NULL) {
encoder->encode(strm, yuv, width, height, imgOffsets, jpegQuality);
delete encoder;
result = JNI_TRUE;
}
env->ReleaseByteArrayElements(inYuv, yuv, 0);
env->ReleaseIntArrayElements(offsets, imgOffsets, 0);
env->ReleaseIntArrayElements(strides, imgStrides, 0);
delete strm;
return result;
}
///////////////////////////////////////////////////////////////////////////////
static const JNINativeMethod gYuvImageMethods[] = {
{ "nativeCompressToJpeg", "([BIII[I[IILjava/io/OutputStream;[B)Z",
(void*)YuvImage_compressToJpeg }
};
int register_android_graphics_YuvImage(JNIEnv* env)
{
return android::RegisterMethodsOrDie(env, "android/graphics/YuvImage", gYuvImageMethods,
NELEM(gYuvImageMethods));
}