core/jni/android/graphics/YuvToJpegEncoder.cpp

   1 #include "CreateJavaOutputStreamAdaptor.h"
   2 #include "SkJPEGWriteUtility.h"
   3 #include "YuvToJpegEncoder.h"
   4 #include <ui/PixelFormat.h>
   5 #include <hardware/hardware.h>
   6
   7 #include "core_jni_helpers.h"
   8
   9 #include <jni.h>
  10
  11 YuvToJpegEncoder* YuvToJpegEncoder::create(int format, int* strides) {
  12     // Only ImageFormat.NV21 and ImageFormat.YUY2 are supported
  13     // for now.
  14     if (format == HAL_PIXEL_FORMAT_YCrCb_420_SP) {
  15         return new Yuv420SpToJpegEncoder(strides);
  16     } else if (format == HAL_PIXEL_FORMAT_YCbCr_422_I) {
  17         return new Yuv422IToJpegEncoder(strides);
  18     } else {
  19       return NULL;
  20     }
  21 }
  22
  23 YuvToJpegEncoder::YuvToJpegEncoder(int* strides) : fStrides(strides) {
  24 }
  25
  26 bool YuvToJpegEncoder::encode(SkWStream* stream, void* inYuv, int width,
  27         int height, int* offsets, int jpegQuality) {
  28     jpeg_compress_struct    cinfo;
  29     skjpeg_error_mgr        sk_err;
  30     skjpeg_destination_mgr  sk_wstream(stream);
  31
  32     cinfo.err = jpeg_std_error(&sk_err);
  33     sk_err.error_exit = skjpeg_error_exit;
  34     if (setjmp(sk_err.fJmpBuf)) {
  35         return false;
  36     }
  37     jpeg_create_compress(&cinfo);
  38
  39     cinfo.dest = &sk_wstream;
  40
  41     setJpegCompressStruct(&cinfo, width, height, jpegQuality);
  42
  43     jpeg_start_compress(&cinfo, TRUE);
  44
  45     compress(&cinfo, (uint8_t*) inYuv, offsets);
  46
  47     jpeg_finish_compress(&cinfo);
  48
  49     return true;
  50 }
  51
  52 void YuvToJpegEncoder::setJpegCompressStruct(jpeg_compress_struct* cinfo,
  53         int width, int height, int quality) {
  54     cinfo->image_width = width;
  55     cinfo->image_height = height;
  56     cinfo->input_components = 3;
  57     cinfo->in_color_space = JCS_YCbCr;
  58     jpeg_set_defaults(cinfo);
  59
  60     jpeg_set_quality(cinfo, quality, TRUE);
  61     jpeg_set_colorspace(cinfo, JCS_YCbCr);
  62     cinfo->raw_data_in = TRUE;
  63     cinfo->dct_method = JDCT_IFAST;
  64     configSamplingFactors(cinfo);
  65 }
  66
  67 ///////////////////////////////////////////////////////////////////
  68 Yuv420SpToJpegEncoder::Yuv420SpToJpegEncoder(int* strides) :
  69         YuvToJpegEncoder(strides) {
  70     fNumPlanes = 2;
  71 }
  72
  73 void Yuv420SpToJpegEncoder::compress(jpeg_compress_struct* cinfo,
  74         uint8_t* yuv, int* offsets) {
  75     SkDebugf("onFlyCompress");
  76     JSAMPROW y[16];
  77     JSAMPROW cb[8];
  78     JSAMPROW cr[8];
  79     JSAMPARRAY planes[3];
  80     planes[0] = y;
  81     planes[1] = cb;
  82     planes[2] = cr;
  83
  84     int width = cinfo->image_width;
  85     int height = cinfo->image_height;
  86     uint8_t* yPlanar = yuv + offsets[0];
  87     uint8_t* vuPlanar = yuv + offsets[1]; //width * height;
  88     uint8_t* uRows = new uint8_t [8 * (width >> 1)];
  89     uint8_t* vRows = new uint8_t [8 * (width >> 1)];
  90
  91
  92     // process 16 lines of Y and 8 lines of U/V each time.
  93     while (cinfo->next_scanline < cinfo->image_height) {
  94         //deitnerleave u and v
  95         deinterleave(vuPlanar, uRows, vRows, cinfo->next_scanline, width, height);
  96
  97         // Jpeg library ignores the rows whose indices are greater than height.
  98         for (int i = 0; i < 16; i++) {
  99             // y row
 100             y[i] = yPlanar + (cinfo->next_scanline + i) * fStrides[0];
 101
 102             // construct u row and v row
 103             if ((i & 1) == 0) {
 104                 // height and width are both halved because of downsampling
 105                 int offset = (i >> 1) * (width >> 1);
 106                 cb[i/2] = uRows + offset;
 107                 cr[i/2] = vRows + offset;
 108             }
 109           }
 110         jpeg_write_raw_data(cinfo, planes, 16);
 111     }
 112     delete [] uRows;
 113     delete [] vRows;
 114
 115 }
 116
 117 void Yuv420SpToJpegEncoder::deinterleave(uint8_t* vuPlanar, uint8_t* uRows,
 118         uint8_t* vRows, int rowIndex, int width, int height) {
 119     int numRows = (height - rowIndex) / 2;
 120     if (numRows > 8) numRows = 8;
 121     for (int row = 0; row < numRows; ++row) {
 122         int offset = ((rowIndex >> 1) + row) * fStrides[1];
 123         uint8_t* vu = vuPlanar + offset;
 124         for (int i = 0; i < (width >> 1); ++i) {
 125             int index = row * (width >> 1) + i;
 126             uRows[index] = vu[1];
 127             vRows[index] = vu[0];
 128             vu += 2;
 129         }
 130     }
 131 }
 132
 133 void Yuv420SpToJpegEncoder::configSamplingFactors(jpeg_compress_struct* cinfo) {
 134     // cb and cr are horizontally downsampled and vertically downsampled as well.
 135     cinfo->comp_info[0].h_samp_factor = 2;
 136     cinfo->comp_info[0].v_samp_factor = 2;
 137     cinfo->comp_info[1].h_samp_factor = 1;
 138     cinfo->comp_info[1].v_samp_factor = 1;
 139     cinfo->comp_info[2].h_samp_factor = 1;
 140     cinfo->comp_info[2].v_samp_factor = 1;
 141 }
 142
 143 ///////////////////////////////////////////////////////////////////////////////
 144 Yuv422IToJpegEncoder::Yuv422IToJpegEncoder(int* strides) :
 145         YuvToJpegEncoder(strides) {
 146     fNumPlanes = 1;
 147 }
 148
 149 void Yuv422IToJpegEncoder::compress(jpeg_compress_struct* cinfo,
 150         uint8_t* yuv, int* offsets) {
 151     SkDebugf("onFlyCompress_422");
 152     JSAMPROW y[16];
 153     JSAMPROW cb[16];
 154     JSAMPROW cr[16];
 155     JSAMPARRAY planes[3];
 156     planes[0] = y;
 157     planes[1] = cb;
 158     planes[2] = cr;
 159
 160     int width = cinfo->image_width;
 161     int height = cinfo->image_height;
 162     uint8_t* yRows = new uint8_t [16 * width];
 163     uint8_t* uRows = new uint8_t [16 * (width >> 1)];
 164     uint8_t* vRows = new uint8_t [16 * (width >> 1)];
 165
 166     uint8_t* yuvOffset = yuv + offsets[0];
 167
 168     // process 16 lines of Y and 16 lines of U/V each time.
 169     while (cinfo->next_scanline < cinfo->image_height) {
 170         deinterleave(yuvOffset, yRows, uRows, vRows, cinfo->next_scanline, width, height);
 171
 172         // Jpeg library ignores the rows whose indices are greater than height.
 173         for (int i = 0; i < 16; i++) {
 174             // y row
 175             y[i] = yRows + i * width;
 176
 177             // construct u row and v row
 178             // width is halved because of downsampling
 179             int offset = i * (width >> 1);
 180             cb[i] = uRows + offset;
 181             cr[i] = vRows + offset;
 182         }
 183
 184         jpeg_write_raw_data(cinfo, planes, 16);
 185     }
 186     delete [] yRows;
 187     delete [] uRows;
 188     delete [] vRows;
 189 }
 190
 191
 192 void Yuv422IToJpegEncoder::deinterleave(uint8_t* yuv, uint8_t* yRows, uint8_t* uRows,
 193         uint8_t* vRows, int rowIndex, int width, int height) {
 194     int numRows = height - rowIndex;
 195     if (numRows > 16) numRows = 16;
 196     for (int row = 0; row < numRows; ++row) {
 197         uint8_t* yuvSeg = yuv + (rowIndex + row) * fStrides[0];
 198         for (int i = 0; i < (width >> 1); ++i) {
 199             int indexY = row * width + (i << 1);
 200             int indexU = row * (width >> 1) + i;
 201             yRows[indexY] = yuvSeg[0];
 202             yRows[indexY + 1] = yuvSeg[2];
 203             uRows[indexU] = yuvSeg[1];
 204             vRows[indexU] = yuvSeg[3];
 205             yuvSeg += 4;
 206         }
 207     }
 208 }
 209
 210 void Yuv422IToJpegEncoder::configSamplingFactors(jpeg_compress_struct* cinfo) {
 211     // cb and cr are horizontally downsampled and vertically downsampled as well.
 212     cinfo->comp_info[0].h_samp_factor = 2;
 213     cinfo->comp_info[0].v_samp_factor = 2;
 214     cinfo->comp_info[1].h_samp_factor = 1;
 215     cinfo->comp_info[1].v_samp_factor = 2;
 216     cinfo->comp_info[2].h_samp_factor = 1;
 217     cinfo->comp_info[2].v_samp_factor = 2;
 218 }
 219 ///////////////////////////////////////////////////////////////////////////////
 220
 221 static jboolean YuvImage_compressToJpeg(JNIEnv* env, jobject, jbyteArray inYuv,
 222         jint format, jint width, jint height, jintArray offsets,
 223         jintArray strides, jint jpegQuality, jobject jstream,
 224         jbyteArray jstorage) {
 225     jbyte* yuv = env->GetByteArrayElements(inYuv, NULL);
 226     SkWStream* strm = CreateJavaOutputStreamAdaptor(env, jstream, jstorage);
 227
 228     jint* imgOffsets = env->GetIntArrayElements(offsets, NULL);
 229     jint* imgStrides = env->GetIntArrayElements(strides, NULL);
 230     YuvToJpegEncoder* encoder = YuvToJpegEncoder::create(format, imgStrides);
 231     jboolean result = JNI_FALSE;
 232     if (encoder != NULL) {
 233         encoder->encode(strm, yuv, width, height, imgOffsets, jpegQuality);
 234         delete encoder;
 235         result = JNI_TRUE;
 236     }
 237
 238     env->ReleaseByteArrayElements(inYuv, yuv, 0);
 239     env->ReleaseIntArrayElements(offsets, imgOffsets, 0);
 240     env->ReleaseIntArrayElements(strides, imgStrides, 0);
 241     delete strm;
 242     return result;
 243 }
 244 ///////////////////////////////////////////////////////////////////////////////
 245
 246 static const JNINativeMethod gYuvImageMethods[] = {
 247     {   "nativeCompressToJpeg",  "([BIII[I[IILjava/io/OutputStream;[B)Z",
 248         (void*)YuvImage_compressToJpeg }
 249 };
 250
 251 int register_android_graphics_YuvImage(JNIEnv* env)
 252 {
 253     return android::RegisterMethodsOrDie(env, "android/graphics/YuvImage", gYuvImageMethods,
 254                                          NELEM(gYuvImageMethods));
 255 }