--- /dev/null
+/*********************************************************************
+ * add and modified some function to avoid crash
+ * Copyright (C) 2014-2015 saki@serenegiant All rights reserved.
+ *********************************************************************/
+/*********************************************************************
+ * Software License Agreement (BSD License)
+ *
+ * Copyright (C) 2014 Robert Xiao
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of the author nor other contributors may be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *********************************************************************/
+
+/**
+ * @defgroup frame Frame processing
+ */
+#include "libuvc/libuvc.h"
+#include "libuvc/libuvc_internal.h"
+#include <jpeglib.h>
+#include <setjmp.h>
+
+extern uvc_error_t uvc_ensure_frame_size(uvc_frame_t *frame, size_t need_bytes);
+
+struct error_mgr {
+ struct jpeg_error_mgr super;
+ jmp_buf jmp;
+};
+
+static void _error_exit(j_common_ptr dinfo) {
+ struct error_mgr *myerr = (struct error_mgr *) dinfo->err;
+#ifndef NDEBUG
+#if (defined(ANDROID) || defined(__ANDROID__))
+ char err_msg[1024];
+ (*dinfo->err->format_message)(dinfo, err_msg);
+ err_msg[1023] = 0;
+ LOGW("err=%s", err_msg);
+#else
+ (*dinfo->err->output_message)(dinfo);
+#endif
+#endif
+ longjmp(myerr->jmp, 1);
+}
+
+/* ISO/IEC 10918-1:1993(E) K.3.3. Default Huffman tables used by MJPEG UVC devices
+ which don't specify a Huffman table in the JPEG stream. */
+static const unsigned char dc_lumi_len[] = {
+ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
+static const unsigned char dc_lumi_val[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
+
+static const unsigned char dc_chromi_len[] = {
+ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
+static const unsigned char dc_chromi_val[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
+
+static const unsigned char ac_lumi_len[] = {
+ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
+static const unsigned char ac_lumi_val[] = {
+ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
+ 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
+ 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
+ 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
+ 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
+ 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
+ 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
+ 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
+ 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
+ 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
+ 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
+ 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
+ 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
+ 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
+ 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
+ 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
+ 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
+ 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
+ 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
+ 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa
+};
+static const unsigned char ac_chromi_len[] = {
+ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
+static const unsigned char ac_chromi_val[] = {
+ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
+ 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
+ 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
+ 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
+ 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
+ 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
+ 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
+ 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
+ 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
+ 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
+ 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
+ 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+ 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
+ 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
+ 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
+ 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
+ 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
+ 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
+ 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
+ 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa
+};
+
+#define COPY_HUFF_TABLE(dinfo,tbl,name) do { \
+ if (dinfo->tbl == NULL) dinfo->tbl = jpeg_alloc_huff_table((j_common_ptr)dinfo); \
+ memcpy(dinfo->tbl->bits, name##_len, sizeof(name##_len)); \
+ memset(dinfo->tbl->huffval, 0, sizeof(dinfo->tbl->huffval)); \
+ memcpy(dinfo->tbl->huffval, name##_val, sizeof(name##_val)); \
+ } while(0)
+
+static inline void insert_huff_tables(j_decompress_ptr dinfo) {
+ COPY_HUFF_TABLE(dinfo, dc_huff_tbl_ptrs[0], dc_lumi);
+ COPY_HUFF_TABLE(dinfo, dc_huff_tbl_ptrs[1], dc_chromi);
+ COPY_HUFF_TABLE(dinfo, ac_huff_tbl_ptrs[0], ac_lumi);
+ COPY_HUFF_TABLE(dinfo, ac_huff_tbl_ptrs[1], ac_chromi);
+}
+
+// XXX added to improve the performance of decoding
+// maximun reading lines for each call of jpeg_read_scanlines
+// when defined this macro, it's value should be common factor
+// of all available frame height.
+// (1, 2, 4, 5, 6, 8, 10, 12, 20, 40...for 720p&1080p)
+#define MAX_READLINE 8
+
+#ifndef MAX_READLINE
+#define MAX_READLINE 1
+#endif
+#if MAX_READLINE < 1
+#undef MAX_READLINE
+#define MAX_READLINE 1
+#endif
+
+/** @brief Convert an MJPEG frame to RGB
+ * @ingroup frame
+ *
+ * @param in MJPEG frame
+ * @param out RGB frame
+ */
+uvc_error_t uvc_mjpeg2rgb(uvc_frame_t *in, uvc_frame_t *out) {
+ struct jpeg_decompress_struct dinfo;
+ struct error_mgr jerr;
+ size_t lines_read;
+ // local copy
+ uint8_t *data = out->data;
+ const int out_step = out->step;
+
+ int num_scanlines, i;
+ lines_read = 0;
+ unsigned char *buffer[MAX_READLINE];
+
+ out->actual_bytes = 0; // XXX
+ if (UNLIKELY(in->frame_format != UVC_FRAME_FORMAT_MJPEG))
+ return UVC_ERROR_INVALID_PARAM;
+
+ if (uvc_ensure_frame_size(out, in->width * in->height * 3) < 0)
+ return UVC_ERROR_NO_MEM;
+
+ out->width = in->width;
+ out->height = in->height;
+ out->frame_format = UVC_FRAME_FORMAT_RGB;
+ out->step = in->width * 3;
+ out->sequence = in->sequence;
+ out->capture_time = in->capture_time;
+ out->source = in->source;
+
+ dinfo.err = jpeg_std_error(&jerr.super);
+ jerr.super.error_exit = _error_exit;
+
+ if (setjmp(jerr.jmp)) {
+ goto fail;
+ }
+
+ jpeg_create_decompress(&dinfo);
+ jpeg_mem_src(&dinfo, in->data, in->actual_bytes/*in->data_bytes*/);
+ jpeg_read_header(&dinfo, TRUE);
+
+ if (dinfo.dc_huff_tbl_ptrs[0] == NULL) {
+ /* This frame is missing the Huffman tables: fill in the standard ones */
+ insert_huff_tables(&dinfo);
+ }
+
+ dinfo.out_color_space = JCS_RGB;
+ dinfo.dct_method = JDCT_IFAST;
+
+ jpeg_start_decompress(&dinfo);
+
+ if (LIKELY(dinfo.output_height == out->height)) {
+ for (; dinfo.output_scanline < dinfo.output_height ;) {
+ buffer[0] = data + (lines_read) * out_step;
+ for (i = 1; i < MAX_READLINE; i++)
+ buffer[i] = buffer[i-1] + out_step;
+ num_scanlines = jpeg_read_scanlines(&dinfo, buffer, MAX_READLINE);
+ lines_read += num_scanlines;
+ }
+ out->actual_bytes = in->width * in->height * 3; // XXX
+ }
+ jpeg_finish_decompress(&dinfo);
+ jpeg_destroy_decompress(&dinfo);
+ return lines_read == out->height ? UVC_SUCCESS : UVC_ERROR_OTHER; // XXX
+
+fail:
+ jpeg_destroy_decompress(&dinfo);
+ return UVC_ERROR_OTHER+1;
+}
+
+/** @brief Convert an MJPEG frame to BGR
+ * @ingroup frame
+ *
+ * @param in MJPEG frame
+ * @param out BGR frame
+ */
+uvc_error_t uvc_mjpeg2bgr(uvc_frame_t *in, uvc_frame_t *out) {
+ struct jpeg_decompress_struct dinfo;
+ struct error_mgr jerr;
+ size_t lines_read;
+
+ int num_scanlines, i;
+ lines_read = 0;
+ unsigned char *buffer[MAX_READLINE];
+
+ out->actual_bytes = 0; // XXX
+ if (UNLIKELY(in->frame_format != UVC_FRAME_FORMAT_MJPEG))
+ return UVC_ERROR_INVALID_PARAM;
+
+ if (uvc_ensure_frame_size(out, in->width * in->height * 3) < 0)
+ return UVC_ERROR_NO_MEM;
+
+ out->width = in->width;
+ out->height = in->height;
+ out->frame_format = UVC_FRAME_FORMAT_BGR;
+ out->step = in->width * 3;
+ out->sequence = in->sequence;
+ out->capture_time = in->capture_time;
+ out->source = in->source;
+
+ dinfo.err = jpeg_std_error(&jerr.super);
+ jerr.super.error_exit = _error_exit;
+
+ if (setjmp(jerr.jmp)) {
+ goto fail;
+ }
+
+ jpeg_create_decompress(&dinfo);
+ jpeg_mem_src(&dinfo, in->data, in->actual_bytes/*in->data_bytes*/);
+ jpeg_read_header(&dinfo, TRUE);
+
+ if (dinfo.dc_huff_tbl_ptrs[0] == NULL) {
+ /* This frame is missing the Huffman tables: fill in the standard ones */
+ insert_huff_tables(&dinfo);
+ }
+
+ dinfo.out_color_space = JCS_EXT_BGR;
+ dinfo.dct_method = JDCT_IFAST;
+
+ jpeg_start_decompress(&dinfo);
+
+ // local copy
+ uint8_t *data = out->data;
+ const int out_step = out->step;
+
+ if (LIKELY(dinfo.output_height == out->height)) {
+ for (; dinfo.output_scanline < dinfo.output_height ;) {
+ buffer[0] = data + (lines_read) * out_step;
+ for (i = 1; i < MAX_READLINE; i++)
+ buffer[i] = buffer[i-1] + out_step;
+ num_scanlines = jpeg_read_scanlines(&dinfo, buffer, MAX_READLINE);
+ lines_read += num_scanlines;
+ }
+ out->actual_bytes = in->width * in->height * 3; // XXX
+ }
+ jpeg_finish_decompress(&dinfo);
+ jpeg_destroy_decompress(&dinfo);
+ return lines_read == out->height ? UVC_SUCCESS : UVC_ERROR_OTHER; // XXX
+
+fail:
+ jpeg_destroy_decompress(&dinfo);
+ return UVC_ERROR_OTHER+1;
+}
+
+/** @brief Convert an MJPEG frame to RGB565
+ * @ingroup frame
+ *
+ * @param in MJPEG frame
+ * @param out RGB frame
+ */
+uvc_error_t uvc_mjpeg2rgb565(uvc_frame_t *in, uvc_frame_t *out) {
+ struct jpeg_decompress_struct dinfo;
+ struct error_mgr jerr;
+ size_t lines_read;
+
+ int num_scanlines, i;
+ lines_read = 0;
+ unsigned char *buffer[MAX_READLINE];
+
+ out->actual_bytes = 0; // XXX
+ if (UNLIKELY(in->frame_format != UVC_FRAME_FORMAT_MJPEG))
+ return UVC_ERROR_INVALID_PARAM;
+
+ if (uvc_ensure_frame_size(out, in->width * in->height * 2) < 0)
+ return UVC_ERROR_NO_MEM;
+
+ out->width = in->width;
+ out->height = in->height;
+ out->frame_format = UVC_FRAME_FORMAT_RGB565;
+ out->step = in->width * 2;
+ out->sequence = in->sequence;
+ out->capture_time = in->capture_time;
+ out->source = in->source;
+
+ dinfo.err = jpeg_std_error(&jerr.super);
+ jerr.super.error_exit = _error_exit;
+
+ if (setjmp(jerr.jmp)) {
+ goto fail;
+ }
+
+ jpeg_create_decompress(&dinfo);
+ jpeg_mem_src(&dinfo, in->data, in->actual_bytes/*in->data_bytes*/);
+ jpeg_read_header(&dinfo, TRUE);
+
+ if (dinfo.dc_huff_tbl_ptrs[0] == NULL) {
+ /* This frame is missing the Huffman tables: fill in the standard ones */
+ insert_huff_tables(&dinfo);
+ }
+
+ dinfo.out_color_space = JCS_RGB565;
+ dinfo.dct_method = JDCT_IFAST;
+
+ jpeg_start_decompress(&dinfo);
+
+ // local copy
+ uint8_t *data = out->data;
+ const int out_step = out->step;
+
+ if (LIKELY(dinfo.output_height == out->height)) {
+ for (; dinfo.output_scanline < dinfo.output_height ;) {
+ buffer[0] = data + (lines_read) * out_step;
+ for (i = 1; i < MAX_READLINE; i++)
+ buffer[i] = buffer[i-1] + out_step;
+ num_scanlines = jpeg_read_scanlines(&dinfo, buffer, MAX_READLINE);
+ lines_read += num_scanlines;
+ }
+ out->actual_bytes = in->width * in->height * 2; // XXX
+ }
+ jpeg_finish_decompress(&dinfo);
+ jpeg_destroy_decompress(&dinfo);
+ return lines_read == out->height ? UVC_SUCCESS : UVC_ERROR_OTHER; // XXX
+
+fail:
+ jpeg_destroy_decompress(&dinfo);
+ return UVC_ERROR_OTHER+1;
+}
+
+/** @brief Convert an MJPEG frame to RGBX
+ * @ingroup frame
+ *
+ * @param in MJPEG frame
+ * @param out RGBX frame
+ */
+uvc_error_t uvc_mjpeg2rgbx(uvc_frame_t *in, uvc_frame_t *out) {
+ struct jpeg_decompress_struct dinfo;
+ struct error_mgr jerr;
+ size_t lines_read;
+ // local copy
+ uint8_t *data = out->data;
+ const int out_step = out->step;
+
+ int num_scanlines, i;
+ lines_read = 0;
+ unsigned char *buffer[MAX_READLINE];
+
+ out->actual_bytes = 0; // XXX
+ if (UNLIKELY(in->frame_format != UVC_FRAME_FORMAT_MJPEG))
+ return UVC_ERROR_INVALID_PARAM;
+
+ if (uvc_ensure_frame_size(out, in->width * in->height * 4) < 0)
+ return UVC_ERROR_NO_MEM;
+
+ out->width = in->width;
+ out->height = in->height;
+ out->frame_format = UVC_FRAME_FORMAT_RGBX; // XXX
+ out->step = in->width * 4;
+ out->sequence = in->sequence;
+ out->capture_time = in->capture_time;
+ out->source = in->source;
+
+ dinfo.err = jpeg_std_error(&jerr.super);
+ jerr.super.error_exit = _error_exit;
+
+ if (setjmp(jerr.jmp)) {
+ goto fail;
+ }
+
+ jpeg_create_decompress(&dinfo);
+ jpeg_mem_src(&dinfo, in->data, in->actual_bytes/*in->data_bytes*/); // XXX
+ jpeg_read_header(&dinfo, TRUE);
+
+ if (dinfo.dc_huff_tbl_ptrs[0] == NULL) {
+ /* This frame is missing the Huffman tables: fill in the standard ones */
+ insert_huff_tables(&dinfo);
+ }
+
+ dinfo.out_color_space = JCS_EXT_RGBA;
+ dinfo.dct_method = JDCT_IFAST;
+
+ jpeg_start_decompress(&dinfo);
+
+ if (LIKELY(dinfo.output_height == out->height)) {
+ for (; dinfo.output_scanline < dinfo.output_height ;) {
+ buffer[0] = data + (lines_read) * out_step;
+ for (i = 1; i < MAX_READLINE; i++)
+ buffer[i] = buffer[i-1] + out_step;
+ num_scanlines = jpeg_read_scanlines(&dinfo, buffer, MAX_READLINE);
+ lines_read += num_scanlines;
+ }
+ out->actual_bytes = in->width * in->height * 4; // XXX
+ }
+ jpeg_finish_decompress(&dinfo);
+ jpeg_destroy_decompress(&dinfo);
+ return lines_read == out->height ? UVC_SUCCESS : UVC_ERROR_OTHER; // XXX
+
+fail:
+ jpeg_destroy_decompress(&dinfo);
+ return UVC_ERROR_OTHER+1;
+}
+
+static inline unsigned char sat(int i) {
+ return (unsigned char) (i >= 255 ? 255 : (i < 0 ? 0 : i));
+}
+
+#define YCbCr_YUYV_2(YCbCr, yuyv) \
+ { \
+ *(yuyv++) = *(YCbCr+0); \
+ *(yuyv++) = (*(YCbCr+1) + *(YCbCr+4)) >> 1; \
+ *(yuyv++) = *(YCbCr+3); \
+ *(yuyv++) = (*(YCbCr+2) + *(YCbCr+5)) >> 1; \
+ }
+
+uvc_error_t uvc_mjpeg2yuyv(uvc_frame_t *in, uvc_frame_t *out) {
+
+ out->actual_bytes = 0; // XXX
+ if (UNLIKELY(in->frame_format != UVC_FRAME_FORMAT_MJPEG))
+ return UVC_ERROR_INVALID_PARAM;
+
+ if (uvc_ensure_frame_size(out, in->width * in->height * 2) < 0)
+ return UVC_ERROR_NO_MEM;
+
+ size_t lines_read = 0;
+ int i, j;
+ int num_scanlines;
+ register uint8_t *yuyv, *ycbcr;
+
+ out->width = in->width;
+ out->height = in->height;
+ out->frame_format = UVC_FRAME_FORMAT_YUYV;
+ out->step = in->width * 2;
+ out->sequence = in->sequence;
+ out->capture_time = in->capture_time;
+ out->source = in->source;
+
+ struct jpeg_decompress_struct dinfo;
+ struct error_mgr jerr;
+ dinfo.err = jpeg_std_error(&jerr.super);
+ jerr.super.error_exit = _error_exit;
+
+ if (setjmp(jerr.jmp)) {
+ goto fail;
+ }
+
+ jpeg_create_decompress(&dinfo);
+ jpeg_mem_src(&dinfo, in->data, in->actual_bytes/*in->data_bytes*/); // XXX
+ jpeg_read_header(&dinfo, TRUE);
+
+ if (dinfo.dc_huff_tbl_ptrs[0] == NULL) {
+ /* This frame is missing the Huffman tables: fill in the standard ones */
+ insert_huff_tables(&dinfo);
+ }
+
+ dinfo.out_color_space = JCS_YCbCr;
+ dinfo.dct_method = JDCT_IFAST;
+
+ // start decompressor
+ jpeg_start_decompress(&dinfo);
+
+ // these dinfo.xxx valiables are only valid after jpeg_start_decompress
+ const int row_stride = dinfo.output_width * dinfo.output_components;
+
+ // allocate buffer
+ register JSAMPARRAY buffer = (*dinfo.mem->alloc_sarray)
+ ((j_common_ptr) &dinfo, JPOOL_IMAGE, row_stride, MAX_READLINE);
+
+ // local copy
+ uint8_t *data = out->data;
+ const int out_step = out->step;
+
+ if (LIKELY(dinfo.output_height == out->height)) {
+ for (; dinfo.output_scanline < dinfo.output_height ;) {
+ // convert lines of mjpeg data to YCbCr
+ num_scanlines = jpeg_read_scanlines(&dinfo, buffer, MAX_READLINE);
+ // convert YCbCr to yuyv(YUV422)
+ for (j = 0; j < num_scanlines; j++) {
+ yuyv = data + (lines_read + j) * out_step;
+ ycbcr = buffer[j];
+ for (i = 0; i < row_stride; i += 24) { // step by YCbCr x 8 pixels = 3 x 8 bytes
+ YCbCr_YUYV_2(ycbcr + i, yuyv);
+ YCbCr_YUYV_2(ycbcr + i + 6, yuyv);
+ YCbCr_YUYV_2(ycbcr + i + 12, yuyv);
+ YCbCr_YUYV_2(ycbcr + i + 18, yuyv);
+ }
+ }
+ lines_read += num_scanlines;
+ }
+ out->actual_bytes = in->width * in->height * 2; // XXX
+ }
+
+ jpeg_finish_decompress(&dinfo);
+ jpeg_destroy_decompress(&dinfo);
+ return lines_read == out->height ? UVC_SUCCESS : UVC_ERROR_OTHER;
+
+fail:
+ jpeg_destroy_decompress(&dinfo);
+ return lines_read == out->height ? UVC_SUCCESS : UVC_ERROR_OTHER+1;
+}
+
projects / rtmpclient.git / blobdiff