forked/ustreamer
1
0
Fork 0
mirror of https://github.com/pikvm/ustreamer.git synced 2026-03-12 18:43:42 +00:00
Code Issues Packages Projects Releases Wiki Activity

huffman

Browse Source
This commit is contained in:
Devaev Maxim
2019-03-06 01:33:20 +03:00
parent f439f37526
commit a5bca4cca3
2 changed files with 128 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

65
src/encoders/hw/encoder.c
View File

@@ -2,6 +2,11 @@
# #
# 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 #
@@ -20,6 +25,7 @@
*****************************************************************************/
#include <stdbool.h>
#include <string.h>
#include <assert.h>
@@ -30,6 +36,13 @@
#include "../../xioctl.h"
#include "../../device.h"
#include "huffman.h"
#include "encoder.h"
static bool _is_huffman(const unsigned char *data);
static size_t _memcpy_with_huffman(unsigned char *dest, const unsigned char *src, size_t size);
int hw_encoder_prepare_live(struct device_t *dev, unsigned quality) {
struct v4l2_jpegcompression comp;
@@ -52,7 +65,53 @@ void hw_encoder_compress_buffer(struct device_t *dev, unsigned index) {
if (dev->run->format != V4L2_PIX_FMT_MJPEG && dev->run->format != V4L2_PIX_FMT_JPEG) {
assert(0 && "Unsupported input format for HW JPEG encoder");
}
assert(dev->run->pictures[index].allocated >= dev->run->hw_buffers[index].length);
memcpy(dev->run->pictures[index].data, dev->run->hw_buffers[index].start, dev->run->hw_buffers[index].length);
dev->run->pictures[index].size = dev->run->hw_buffers[index].length;
# define PICTURE(_next) dev->run->pictures[index]._next
# define HW_BUFFER(_next) dev->run->hw_buffers[index]._next
assert(PICTURE(allocated) >= HW_BUFFER(length) + sizeof(HUFFMAN_TABLE));
PICTURE(size) = _memcpy_with_huffman(PICTURE(data), HW_BUFFER(start), HW_BUFFER(length));
# undef HW_BUFFER
# undef PICTURE
}
static bool _is_huffman(const unsigned char *data) {
unsigned count = 0;
while (((data[0] << 8) | data[1]) != 0xFFDA) {
if (count++ > 2048) {
return false;
}
if (((data[0] << 8) | data[1]) == 0xFFC4) {
return true;
}
data += 1;
}
return false;
}
static size_t _memcpy_with_huffman(unsigned char *dest, const unsigned char *src, size_t size) {
if (!_is_huffman(src)) {
const unsigned char *src_ptr = src;
const unsigned char *src_end = src + size;
size_t paste;
while ((((src_ptr[0] << 8) | src_ptr[1]) != 0xFFC0) && (src_ptr < src_end)) {
src_ptr += 1;
}
if (src_ptr >= src_end) {
return 0;
}
paste = src_ptr - src;
memcpy(dest, src, paste);
memcpy(dest + paste, HUFFMAN_TABLE, sizeof(HUFFMAN_TABLE));
memcpy(dest + paste + sizeof(HUFFMAN_TABLE), src_ptr, size - paste);
return (size + sizeof(HUFFMAN_TABLE));
} else {
memcpy(dest, src, size);
return size;
}
}

66
src/encoders/hw/huffman.h Normal file
View File

@@ -0,0 +1,66 @@
/*****************************************************************************
# #
# 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/>. #
# #
*****************************************************************************/
#pragma once
static const unsigned char HUFFMAN_TABLE[] = {
0xFF, 0xC4, 0x01, 0xA2, 0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02,
0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x01, 0x00, 0x03,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x0A, 0x0B, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03, 0x05,
0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D, 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, 0x11, 0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05,
0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 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,
};