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refactoring

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This commit is contained in:
Devaev Maxim
2018-09-24 08:01:25 +03:00
parent ad6667feed
commit 9c6852fdf7
5 changed files with 12 additions and 8 deletions
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263
src/jpeg/encoder.c Normal file
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/*****************************************************************************
# uStreamer - Lightweight and fast MJPG-HTTP streamer. #
# #
# This source file based on code of MJPG-Streamer. #
# #
# Copyright (C) 2005-2006 Laurent Pinchart & Michel Xhaard #
# Copyright (C) 2006 Gabriel A. Devenyi #
# Copyright (C) 2007 Tom Stöveken #
# Copyright (C) 2018 Maxim Devaev <mdevaev@gmail.com> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <jpeglib.h>
#include <linux/videodev2.h>
#include "../tools.h"
#include "../device.h"
#include "encoder.h"
#define JPEG_OUTPUT_BUFFER_SIZE 4096
struct mjpg_destination_mgr {
struct jpeg_destination_mgr mgr; // Default manager
JOCTET *buffer; // Start of buffer
unsigned char *outbuffer_cursor;
unsigned long *written;
};
static void _jpeg_set_dest_picture(j_compress_ptr jpeg, unsigned char *picture, unsigned long *written);
static void _jpeg_write_scanlines_yuyv(struct jpeg_compress_struct *jpeg,
unsigned char *line_buffer, const unsigned char *data,
const unsigned width, const unsigned height);
static void _jpeg_write_scanlines_uyvy(struct jpeg_compress_struct *jpeg,
unsigned char *line_buffer, const unsigned char *data,
const unsigned width, const unsigned height);
static void _jpeg_write_scanlines_rgb565(struct jpeg_compress_struct *jpeg,
unsigned char *line_buffer, const unsigned char *data,
const unsigned width, const unsigned height);
static void _jpeg_init_destination(j_compress_ptr jpeg);
static boolean _jpeg_empty_output_buffer(j_compress_ptr jpeg);
static void _jpeg_term_destination(j_compress_ptr jpeg);
int jpeg_compress_buffer(struct device_t *dev, int index) {
// This function based on compress_image_to_jpeg() from mjpg-streamer
struct jpeg_compress_struct jpeg;
struct jpeg_error_mgr jpeg_error;
unsigned char *line_buffer;
A_CALLOC(line_buffer, dev->run->width * 3);
jpeg.err = jpeg_std_error(&jpeg_error);
jpeg_create_compress(&jpeg);
dev->run->pictures[index].size = 0;
_jpeg_set_dest_picture(&jpeg, dev->run->pictures[index].data, &dev->run->pictures[index].size);
jpeg.image_width = dev->run->width;
jpeg.image_height = dev->run->height;
jpeg.input_components = 3;
jpeg.in_color_space = JCS_RGB;
jpeg_set_defaults(&jpeg);
jpeg_set_quality(&jpeg, dev->jpeg_quality, TRUE);
jpeg_start_compress(&jpeg, TRUE);
# define WRITE_SCANLINES(_func) \
_func(&jpeg, line_buffer, dev->run->hw_buffers[index].start, dev->run->width, dev->run->height)
switch (dev->run->format) {
// https://www.fourcc.org/yuv.php
case V4L2_PIX_FMT_YUYV: WRITE_SCANLINES(_jpeg_write_scanlines_yuyv); break;
case V4L2_PIX_FMT_UYVY: WRITE_SCANLINES(_jpeg_write_scanlines_uyvy); break;
case V4L2_PIX_FMT_RGB565: WRITE_SCANLINES(_jpeg_write_scanlines_rgb565); break;
default: assert(0 && "Unsupported input format for JPEG compressor");
}
# undef WRITE_SCANLINES
// TODO: process jpeg errors:
// https://stackoverflow.com/questions/19857766/error-handling-in-libjpeg
jpeg_finish_compress(&jpeg);
jpeg_destroy_compress(&jpeg);
free(line_buffer);
assert(dev->run->pictures[index].size > 0);
return 0;
}
static void _jpeg_set_dest_picture(j_compress_ptr jpeg, unsigned char *picture, unsigned long *written) {
struct mjpg_destination_mgr *dest;
if (jpeg->dest == NULL) {
assert((jpeg->dest = (struct jpeg_destination_mgr *)(*jpeg->mem->alloc_small)(
(j_common_ptr) jpeg, JPOOL_PERMANENT, sizeof(struct mjpg_destination_mgr)
)));
}
dest = (struct mjpg_destination_mgr *) jpeg->dest;
dest->mgr.init_destination = _jpeg_init_destination;
dest->mgr.empty_output_buffer = _jpeg_empty_output_buffer;
dest->mgr.term_destination = _jpeg_term_destination;
dest->outbuffer_cursor = picture;
dest->written = written;
}
static void _jpeg_write_scanlines_yuyv(struct jpeg_compress_struct *jpeg,
unsigned char *line_buffer, const unsigned char *data,
const unsigned width, const unsigned height) {
JSAMPROW scanlines[1];
unsigned z = 0;
while (jpeg->next_scanline < height) {
unsigned char *ptr = line_buffer;
for (unsigned x = 0; x < width; x++) {
int y = (!z ? data[0] << 8 : data[2] << 8);
int u = data[1] - 128;
int v = data[3] - 128;
int r = (y + (359 * v)) >> 8;
int g = (y - (88 * u) - (183 * v)) >> 8;
int b = (y + (454 * u)) >> 8;
*(ptr++) = (r > 255) ? 255 : ((r < 0) ? 0 : r);
*(ptr++) = (g > 255) ? 255 : ((g < 0) ? 0 : g);
*(ptr++) = (b > 255) ? 255 : ((b < 0) ? 0 : b);
if (z++) {
z = 0;
data += 4;
}
}
scanlines[0] = line_buffer;
jpeg_write_scanlines(jpeg, scanlines, 1);
}
}
static void _jpeg_write_scanlines_uyvy(struct jpeg_compress_struct *jpeg,
unsigned char *line_buffer, const unsigned char *data,
const unsigned width, const unsigned height) {
JSAMPROW scanlines[1];
unsigned z = 0;
while(jpeg->next_scanline < height) {
unsigned char *ptr = line_buffer;
for(unsigned x = 0; x < width; x++) {
int y = (!z ? data[1] << 8 : data[3] << 8);
int u = data[0] - 128;
int v = data[2] - 128;
int r = (y + (359 * v)) >> 8;
int g = (y - (88 * u) - (183 * v)) >> 8;
int b = (y + (454 * u)) >> 8;
*(ptr++) = (r > 255) ? 255 : ((r < 0) ? 0 : r);
*(ptr++) = (g > 255) ? 255 : ((g < 0) ? 0 : g);
*(ptr++) = (b > 255) ? 255 : ((b < 0) ? 0 : b);
if (z++) {
z = 0;
data += 4;
}
}
scanlines[0] = line_buffer;
jpeg_write_scanlines(jpeg, scanlines, 1);
}
}
static void _jpeg_write_scanlines_rgb565(struct jpeg_compress_struct *jpeg,
unsigned char *line_buffer, const unsigned char *data,
const unsigned width, const unsigned height) {
JSAMPROW scanlines[1];
while(jpeg->next_scanline < height) {
unsigned char *ptr = line_buffer;
for(unsigned x = 0; x < width; x++) {
unsigned int two_byte = (data[1] << 8) + data[0];
*(ptr++) = data[1] & 248;
*(ptr++) = (unsigned char)((two_byte & 2016) >> 3);
*(ptr++) = (data[0] & 31) * 8;
data += 2;
}
scanlines[0] = line_buffer;
jpeg_write_scanlines(jpeg, scanlines, 1);
}
}
static void _jpeg_init_destination(j_compress_ptr jpeg) {
struct mjpg_destination_mgr *dest = (struct mjpg_destination_mgr *) jpeg->dest;
// Allocate the output buffer - it will be released when done with image
assert((dest->buffer = (JOCTET *)(*jpeg->mem->alloc_small)(
(j_common_ptr) jpeg, JPOOL_IMAGE, JPEG_OUTPUT_BUFFER_SIZE * sizeof(JOCTET)
)));
dest->mgr.next_output_byte = dest->buffer;
dest->mgr.free_in_buffer = JPEG_OUTPUT_BUFFER_SIZE;
}
static boolean _jpeg_empty_output_buffer(j_compress_ptr jpeg) {
// Called whenever local jpeg buffer fills up
struct mjpg_destination_mgr *dest = (struct mjpg_destination_mgr *) jpeg->dest;
memcpy(dest->outbuffer_cursor, dest->buffer, JPEG_OUTPUT_BUFFER_SIZE);
dest->outbuffer_cursor += JPEG_OUTPUT_BUFFER_SIZE;
*dest->written += JPEG_OUTPUT_BUFFER_SIZE;
dest->mgr.next_output_byte = dest->buffer;
dest->mgr.free_in_buffer = JPEG_OUTPUT_BUFFER_SIZE;
return TRUE;
}
static void _jpeg_term_destination(j_compress_ptr jpeg) {
// Called by jpeg_finish_compress after all data has been written.
// Usually needs to flush buffer
struct mjpg_destination_mgr *dest = (struct mjpg_destination_mgr *) jpeg->dest;
size_t data_count = JPEG_OUTPUT_BUFFER_SIZE - dest->mgr.free_in_buffer;
// Write any data remaining in the buffer
memcpy(dest->outbuffer_cursor, dest->buffer, data_count);
dest->outbuffer_cursor += data_count;
*dest->written += data_count;
}

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/*****************************************************************************
# uStreamer - Lightweight and fast MJPG-HTTP streamer. #
# #
# Copyright (C) 2018 Maxim Devaev <mdevaev@gmail.com> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
*****************************************************************************/
#pragma once
#include <stdlib.h>
#include <stddef.h>
#include "../device.h"
int jpeg_compress_buffer(struct device_t *dev, int index);