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vff_mjpeg2jpeg.c
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vff_mjpeg2jpeg.c
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/*
* This file is part of webcam.
*
* Copyright (c) 2013 Aleksander Mazur
*
* webcam 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.
*
* webcam 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 webcam. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include "vff.h"
#include "vff_mjpeg2jpeg.h"
/**
* @addtogroup vff_mjpeg2jpeg
* @{
*/
/**************************************/
/** Missing chunk to be added to a MJPEG frame. */
static const unsigned char video_frame_filter_mjpeg_missing_chunk[] = {
0xFF, 0xC4, 0x01, 0xA2, 0x00,
0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
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,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
0x10,
0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 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,
0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 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
};
/** MJPEG to JPEG filter instance. */
typedef struct {
video_frame_filter_t base; /**< Base structure. */
/**
* State of frame output - index of chunk provided by next call
* to @ref video_frame_filter_mjpeg_Read.
*/
enum {
CHUNK_HEADER, /**< Will provide header of given MJPEG frame. */
CHUNK_MISSING, /**< Will provide @ref video_frame_filter_mjpeg_missing_chunk. */
CHUNK_REMAINDER, /**< Will provide rest of MJPEG frame. */
CHUNK_FINISHED, /**< Will provide empty chunk to indicate end of frame. */
} chunk;
const unsigned char *frame; /**< Pointer to a frame passed to @ref video_frame_filter_mjpeg_PutFrame. */
size_t size; /**< Size of a frame passed to @ref video_frame_filter_mjpeg_PutFrame. */
unsigned header_length; /**< Offset inside @c frame where @ref CHUNK_MISSING jumps in. */
} video_frame_filter_mjpeg_t;
/**************************************/
/** @copydoc video_frame_filter_ops_t::PutFrame */
static void video_frame_filter_mjpeg_PutFrame(video_frame_filter_t *base, const unsigned char *frame, size_t size)
{
video_frame_filter_mjpeg_t *thiz = (video_frame_filter_mjpeg_t *) base;
/* check header */
do {
static const unsigned char hdr1[] = { 0xFF, 0xD8, 0xFF, 0xE0 };
static const unsigned char hdr2[] = "AVI1"; /* null-terminated */
unsigned hdr1_length;
if (size < 12)
break;
if (memcmp(frame, hdr1, sizeof(hdr1)))
break;
hdr1_length = (frame[4] << 8) | frame[5];
if (hdr1_length < 5)
break;
if (memcmp(frame + 6, hdr2, sizeof(hdr2)))
break;
thiz->chunk = CHUNK_HEADER;
thiz->header_length = 4 + hdr1_length;
thiz->frame = frame;
thiz->size = size;
return; /* success */
} while (0);
/*
fprintf(stderr, "Invalid MJPEG frame data (size=%tu)\n", size);
thiz->chunk = CHUNK_FINISHED;
thiz->frame = NULL;
thiz->size = 0;
*/
thiz->chunk = CHUNK_REMAINDER;
thiz->header_length = 0;
thiz->frame = frame;
thiz->size = size;
}
/** @copydoc video_frame_filter_ops_t::GetSize */
static size_t video_frame_filter_mjpeg_GetSize(video_frame_filter_t *base)
{
video_frame_filter_mjpeg_t *thiz = (video_frame_filter_mjpeg_t *) base;
return thiz->size ? thiz->size + sizeof(video_frame_filter_mjpeg_missing_chunk) : 0;
}
/** @copydoc video_frame_filter_ops_t::Read */
static void video_frame_filter_mjpeg_Read(video_frame_filter_t *base, const unsigned char **data, size_t *size)
{
video_frame_filter_mjpeg_t *thiz = (video_frame_filter_mjpeg_t *) base;
switch (thiz->chunk) {
case CHUNK_HEADER:
*data = thiz->frame;
*size = thiz->header_length;
thiz->chunk++;
break;
case CHUNK_MISSING:
*data = video_frame_filter_mjpeg_missing_chunk;
*size = sizeof(video_frame_filter_mjpeg_missing_chunk);
thiz->chunk++;
break;
case CHUNK_REMAINDER:
*data = thiz->frame + thiz->header_length;
*size = thiz->size - thiz->header_length;
thiz->chunk++;
break;
case CHUNK_FINISHED:
*data = NULL;
*size = 0;
break;
}
}
/** @copydoc video_frame_filter_ops_t::Destroy */
static void video_frame_filter_mjpeg_Destroy(video_frame_filter_t *base)
{
video_frame_filter_mjpeg_t *thiz = (video_frame_filter_mjpeg_t *) base;
free(thiz);
}
/** Operations of the MJPEG to JPEG filter. */
video_frame_filter_ops_t video_frame_filter_mjpeg_ops = {
.PutFrame = video_frame_filter_mjpeg_PutFrame,
.GetSize = video_frame_filter_mjpeg_GetSize,
.Read = video_frame_filter_mjpeg_Read,
.Destroy = video_frame_filter_mjpeg_Destroy,
};
/**************************************/
video_frame_filter_t *vff_mjpeg2jpeg_create(void)
{
video_frame_filter_mjpeg_t *rv = (video_frame_filter_mjpeg_t *) calloc(1, sizeof(video_frame_filter_mjpeg_t));
rv->base.op = &video_frame_filter_mjpeg_ops;
return &rv->base;
}
/**
* @}
*/