1 files changed, 91 insertions, 0 deletions
diff --git a/cmds/stagefright/jpeg.cpp b/cmds/stagefright/jpeg.cpp
new file mode 100644
index 0000000..7e859c3
--- /dev/null
+++ b/cmds/stagefright/jpeg.cpp
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * 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 <errno.h>
+#include <setjmp.h>
+#include <stdio.h>
+
+extern "C" {
+#include "jpeglib.h"
+}
+
+static inline uint8_t from565to8(uint16_t p, int start, int bits) {
+    uint8_t c = (p >> start) & ((1 << bits) - 1);
+    return (c << (8 - bits)) | (c >> (bits - (8 - bits)));
+}
+
+struct sf_jpeg_error_mgr {
+    struct jpeg_error_mgr jerr;
+    jmp_buf longjmp_buffer;
+};
+
+void sf_jpeg_error_exit(j_common_ptr cinfo) {
+    struct sf_jpeg_error_mgr *sf_err = (struct sf_jpeg_error_mgr *)cinfo->err;
+    longjmp(sf_err->longjmp_buffer, 0);
+}
+
+int writeJpegFile(const char *filename, uint8_t *frame, int width, int height) {
+    struct sf_jpeg_error_mgr sf_err;
+    struct jpeg_compress_struct cinfo;
+    uint8_t row_data[width * 3];
+    JSAMPROW row_pointer = row_data;
+    FILE *f;
+
+    f = fopen(filename, "w");
+    if (!f) {
+        return -errno;
+    }
+
+    cinfo.err = jpeg_std_error(&sf_err.jerr);
+    sf_err.jerr.error_exit = sf_jpeg_error_exit;
+    if (setjmp(sf_err.longjmp_buffer)) {
+        jpeg_destroy_compress(&cinfo);
+        fclose(f);
+        return -1;
+    }
+
+    jpeg_create_compress(&cinfo);
+    jpeg_stdio_dest(&cinfo, f);
+
+    cinfo.image_width = width;
+    cinfo.image_height = height;
+    cinfo.input_components = 3;
+    cinfo.in_color_space = JCS_RGB;
+
+    jpeg_set_defaults(&cinfo);
+    jpeg_set_quality(&cinfo, 80, TRUE);
+
+    jpeg_start_compress(&cinfo, TRUE);
+
+    for (int row = 0; row < height; row++) {
+        uint16_t *src = (uint16_t *)(frame + row * width * 2);
+        uint8_t *dst = row_data;
+        for (int col = 0; col < width; col++) {
+            dst[0] = from565to8(*src, 11, 5);
+            dst[1] = from565to8(*src, 5, 6);
+            dst[2] = from565to8(*src, 0, 5);
+            dst += 3;
+            src++;
+        }
+        jpeg_write_scanlines(&cinfo, &row_pointer, 1);
+    }
+
+    jpeg_finish_compress(&cinfo);
+    jpeg_destroy_compress(&cinfo);
+
+    fclose(f);
+    return 0;
+}