YuvToJpegEncoder.cpp revision 8f2423e8f394ae0666f1b61f83df4c0c7a4782d9 
1#include "CreateJavaOutputStreamAdaptor.h"
2#include "SkJpegUtility.h"
3#include "YuvToJpegEncoder.h"
4#include <ui/PixelFormat.h>
5#include <hardware/hardware.h>
6
7#include <jni.h>
8
9YuvToJpegEncoder* YuvToJpegEncoder::create(int format, int* strides) {
10    // Only PIXEL_FORMAT_YCbCr_420_SP and PIXEl_FOMAT_YCbCr_422_I are supported
11    // for now.
12    if (format == HAL_PIXEL_FORMAT_YCbCr_420_SP) {
13        return new Yuv420SpToJpegEncoder(strides);
14    } else if (format == HAL_PIXEL_FORMAT_YCbCr_422_I) {
15        return new Yuv422IToJpegEncoder(strides);
16    } else {
17      return NULL;
18    }
19}
20
21YuvToJpegEncoder::YuvToJpegEncoder(int* strides) : fStrides(strides) {
22}
23
24bool YuvToJpegEncoder::encode(SkWStream* stream, void* inYuv, int width,
25        int height, int* offsets, int jpegQuality) {
26    jpeg_compress_struct    cinfo;
27    skjpeg_error_mgr        sk_err;
28    skjpeg_destination_mgr  sk_wstream(stream);
29
30    cinfo.err = jpeg_std_error(&sk_err);
31    sk_err.error_exit = skjpeg_error_exit;
32    if (setjmp(sk_err.fJmpBuf)) {
33        return false;
34    }
35    jpeg_create_compress(&cinfo);
36
37    cinfo.dest = &sk_wstream;
38
39    setJpegCompressStruct(&cinfo, width, height, jpegQuality);
40
41    jpeg_start_compress(&cinfo, TRUE);
42
43    compress(&cinfo, (uint8_t*) inYuv, offsets);
44
45    jpeg_finish_compress(&cinfo);
46
47    return true;
48}
49
50void YuvToJpegEncoder::setJpegCompressStruct(jpeg_compress_struct* cinfo,
51        int width, int height, int quality) {
52    jpeg_set_quality(cinfo, quality, TRUE);
53
54    cinfo->image_width = width;
55    cinfo->image_height = height;
56
57    cinfo->input_components = 3;
58    cinfo->in_color_space = JCS_YCbCr;
59    jpeg_set_defaults(cinfo);
60    jpeg_set_colorspace(cinfo, JCS_YCbCr);
61    cinfo->raw_data_in = TRUE;
62
63    cinfo->dct_method = JDCT_IFAST;
64
65    configSamplingFactors(cinfo);
66}
67
68///////////////////////////////////////////////////////////////////
69Yuv420SpToJpegEncoder::Yuv420SpToJpegEncoder(int* strides) :
70        YuvToJpegEncoder(strides) {
71    fNumPlanes = 2;
72}
73
74void Yuv420SpToJpegEncoder::compress(jpeg_compress_struct* cinfo,
75        uint8_t* yuv, int* offsets) {
76    SkDebugf("onFlyCompress");
77    JSAMPROW y[16];
78    JSAMPROW cb[8];
79    JSAMPROW cr[8];
80    JSAMPARRAY planes[3];
81    planes[0] = y;
82    planes[1] = cb;
83    planes[2] = cr;
84
85    int width = cinfo->image_width;
86    int height = cinfo->image_height;
87    uint8_t* yPlanar = yuv + offsets[0];
88    uint8_t* vuPlanar = yuv + offsets[1]; //width * height;
89    uint8_t* uRows = new uint8_t [8 * (width >> 1)];
90    uint8_t* vRows = new uint8_t [8 * (width >> 1)];
91
92
93    // process 16 lines of Y and 8 lines of U/V each time.
94    while (cinfo->next_scanline < cinfo->image_height) {
95        //deitnerleave u and v
96        deinterleave(vuPlanar, uRows, vRows, cinfo->next_scanline, width);
97
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
117void Yuv420SpToJpegEncoder::deinterleave(uint8_t* vuPlanar, uint8_t* uRows,
118        uint8_t* vRows, int rowIndex, int width) {
119    for (int row = 0; row < 8; ++row) {
120        int offset = ((rowIndex >> 1) + row) * fStrides[1];
121        uint8_t* vu = vuPlanar + offset;
122        for (int i = 0; i < (width >> 1); ++i) {
123            int index = row * (width >> 1) + i;
124            uRows[index] = vu[1];
125            vRows[index] = vu[0];
126            vu += 2;
127        }
128    }
129}
130
131void Yuv420SpToJpegEncoder::configSamplingFactors(jpeg_compress_struct* cinfo) {
132    // cb and cr are horizontally downsampled and vertically downsampled as well.
133    cinfo->comp_info[0].h_samp_factor = 2;
134    cinfo->comp_info[0].v_samp_factor = 2;
135    cinfo->comp_info[1].h_samp_factor = 1;
136    cinfo->comp_info[1].v_samp_factor = 1;
137    cinfo->comp_info[2].h_samp_factor = 1;
138    cinfo->comp_info[2].v_samp_factor = 1;
139}
140
141///////////////////////////////////////////////////////////////////////////////
142Yuv422IToJpegEncoder::Yuv422IToJpegEncoder(int* strides) :
143        YuvToJpegEncoder(strides) {
144    fNumPlanes = 1;
145}
146
147void Yuv422IToJpegEncoder::compress(jpeg_compress_struct* cinfo,
148        uint8_t* yuv, int* offsets) {
149    SkDebugf("onFlyCompress_422");
150    JSAMPROW y[16];
151    JSAMPROW cb[16];
152    JSAMPROW cr[16];
153    JSAMPARRAY planes[3];
154    planes[0] = y;
155    planes[1] = cb;
156    planes[2] = cr;
157
158    int width = cinfo->image_width;
159    int height = cinfo->image_height;
160    uint8_t* yRows = new uint8_t [16 * width];
161    uint8_t* uRows = new uint8_t [16 * (width >> 1)];
162    uint8_t* vRows = new uint8_t [16 * (width >> 1)];
163
164    uint8_t* yuvOffset = yuv + offsets[0];
165
166    // process 16 lines of Y and 16 lines of U/V each time.
167    while (cinfo->next_scanline < cinfo->image_height) {
168        deinterleave(yuvOffset, yRows, uRows, vRows, cinfo->next_scanline, width, height);
169
170        for (int i = 0; i < 16; i++) {
171            // y row
172            y[i] = yRows + i * width;
173
174            // construct u row and v row
175            // width is halved because of downsampling
176            int offset = i * (width >> 1);
177            cb[i] = uRows + offset;
178            cr[i] = vRows + offset;
179        }
180
181        jpeg_write_raw_data(cinfo, planes, 16);
182    }
183    delete [] yRows;
184    delete [] uRows;
185    delete [] vRows;
186}
187
188
189void Yuv422IToJpegEncoder::deinterleave(uint8_t* yuv, uint8_t* yRows, uint8_t* uRows,
190        uint8_t* vRows, int rowIndex, int width, int height) {
191    for (int row = 0; row < 16; ++row) {
192        uint8_t* yuvSeg = yuv + (rowIndex + row) * fStrides[0];
193        for (int i = 0; i < (width >> 1); ++i) {
194            int indexY = row * width + (i << 1);
195            int indexU = row * (width >> 1) + i;
196            yRows[indexY] = yuvSeg[0];
197            yRows[indexY + 1] = yuvSeg[2];
198            uRows[indexU] = yuvSeg[1];
199            vRows[indexU] = yuvSeg[3];
200            yuvSeg += 4;
201        }
202    }
203}
204
205void Yuv422IToJpegEncoder::configSamplingFactors(jpeg_compress_struct* cinfo) {
206    // cb and cr are horizontally downsampled and vertically downsampled as well.
207    cinfo->comp_info[0].h_samp_factor = 2;
208    cinfo->comp_info[0].v_samp_factor = 2;
209    cinfo->comp_info[1].h_samp_factor = 1;
210    cinfo->comp_info[1].v_samp_factor = 2;
211    cinfo->comp_info[2].h_samp_factor = 1;
212    cinfo->comp_info[2].v_samp_factor = 2;
213}
214///////////////////////////////////////////////////////////////////////////////
215
216static jboolean YuvImage_compressToJpeg(JNIEnv* env, jobject, jbyteArray inYuv,
217        int format, int width, int height, jintArray offsets,
218        jintArray strides, int jpegQuality, jobject jstream,
219        jbyteArray jstorage) {
220    jbyte* yuv = env->GetByteArrayElements(inYuv, NULL);
221    SkWStream* strm = CreateJavaOutputStreamAdaptor(env, jstream, jstorage);
222
223    jint* imgOffsets = env->GetIntArrayElements(offsets, NULL);
224    jint* imgStrides = env->GetIntArrayElements(strides, NULL);
225    YuvToJpegEncoder* encoder = YuvToJpegEncoder::create(format, imgStrides);
226    if (encoder == NULL) {
227        return false;
228    }
229    encoder->encode(strm, yuv, width, height, imgOffsets, jpegQuality);
230
231    delete encoder;
232    env->ReleaseByteArrayElements(inYuv, yuv, 0);
233    env->ReleaseIntArrayElements(offsets, imgOffsets, 0);
234    env->ReleaseIntArrayElements(strides, imgStrides, 0);
235    return true;
236}
237///////////////////////////////////////////////////////////////////////////////
238
239#include <android_runtime/AndroidRuntime.h>
240
241static JNINativeMethod gYuvImageMethods[] = {
242    {   "nativeCompressToJpeg",  "([BIII[I[IILjava/io/OutputStream;[B)Z",
243        (void*)YuvImage_compressToJpeg }
244};
245
246#define kClassPathName  "android/graphics/YuvImage"
247
248int register_android_graphics_YuvImage(JNIEnv* env);
249int register_android_graphics_YuvImage(JNIEnv* env)
250{
251    return android::AndroidRuntime::registerNativeMethods(env, kClassPathName,
252            gYuvImageMethods, SK_ARRAY_COUNT(gYuvImageMethods));
253}
254