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jpegutils.c
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jpegutils.c
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/*
* jpegutils.c: Some Utility programs for dealing with
* JPEG encoded images
*
* Copyright (C) 1999 Rainer Johanni <Rainer@Johanni.de>
* Copyright (C) 2001 pHilipp Zabel <pzabel@gmx.de>
* Copyright (C) 2008 Angel Carpintero <motiondevelop@gmail.com>
*
* based on jdatasrc.c and jdatadst.c from the Independent
* JPEG Group's software by Thomas G. Lane
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "motion.h"
#include "jpegutils.h"
#include <setjmp.h>
#include <jpeglib.h>
#include <jerror.h>
#include <assert.h>
/*
* jpeg_data: buffer with input / output jpeg
* len: Length of jpeg buffer
* itype: 0: Not interlaced
* 1: Interlaced, Top field first
* 2: Interlaced, Bottom field first
* ctype Chroma format for decompression.
* Currently only Y4M_CHROMA_{420JPEG,422} are available
* raw0 buffer with input / output raw Y channel
* raw1 buffer with input / output raw U/Cb channel
* raw2 buffer with input / output raw V/Cr channel
* width width of Y channel (width of U/V is width/2)
* height height of Y channel (height of U/V is height/2)
*/
static void jpeg_buffer_src(j_decompress_ptr cinfo, unsigned char *buffer,
long num);
static void jpeg_buffer_dest(j_compress_ptr cinfo, unsigned char *buffer,
long len);
static void jpeg_skip_ff(j_decompress_ptr cinfo);
/*******************************************************************
* *
* The following routines define a JPEG Source manager which *
* just reads from a given buffer (instead of a file as in *
* the jpeg library) *
* *
*******************************************************************/
/*
* Initialize source --- called by jpeg_read_header
* before any data is actually read.
*/
static void init_source(j_decompress_ptr cinfo ATTRIBUTE_UNUSED)
{
/* No work necessary here */
}
/*
* Fill the input buffer --- called whenever buffer is emptied.
*
* Should never be called since all data should be allready provided.
* Is nevertheless sometimes called - sets the input buffer to data
* which is the JPEG EOI marker;
*
*/
static uint8_t EOI_data[2] = { 0xFF, 0xD9 };
static boolean fill_input_buffer(j_decompress_ptr cinfo)
{
cinfo->src->next_input_byte = EOI_data;
cinfo->src->bytes_in_buffer = 2;
return TRUE;
}
/*
* Skip data --- used to skip over a potentially large amount of
* uninteresting data (such as an APPn marker).
*
*/
static void skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
if (num_bytes > 0) {
if (num_bytes > (long) cinfo->src->bytes_in_buffer)
num_bytes = (long) cinfo->src->bytes_in_buffer;
cinfo->src->next_input_byte += (size_t) num_bytes;
cinfo->src->bytes_in_buffer -= (size_t) num_bytes;
}
}
/*
* Terminate source --- called by jpeg_finish_decompress
* after all data has been read. Often a no-op.
*/
static void term_source(j_decompress_ptr cinfo ATTRIBUTE_UNUSED)
{
/* No work necessary here */
}
/*
* Prepare for input from a data buffer.
*/
static void jpeg_buffer_src(j_decompress_ptr cinfo, unsigned char *buffer, long num)
{
/* The source object and input buffer are made permanent so that a series
* of JPEG images can be read from the same buffer by calling jpeg_buffer_src
* only before the first one. (If we discarded the buffer at the end of
* one image, we'd likely lose the start of the next one.)
* This makes it unsafe to use this manager and a different source
* manager serially with the same JPEG object. Caveat programmer.
*/
if (cinfo->src == NULL) { /* First time for this JPEG object? */
cinfo->src = (struct jpeg_source_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
sizeof (struct jpeg_source_mgr));
}
cinfo->src->init_source = init_source;
cinfo->src->fill_input_buffer = fill_input_buffer;
cinfo->src->skip_input_data = skip_input_data;
cinfo->src->resync_to_restart = jpeg_resync_to_restart; /* Use default method */
cinfo->src->term_source = term_source;
cinfo->src->bytes_in_buffer = num;
cinfo->src->next_input_byte = (JOCTET *) buffer;
}
/*
* jpeg_skip_ff is not a part of the source manager but it is
* particularly useful when reading several images from the same buffer:
* It should be called to skip padding 0xff bytes beetween images.
*/
static void jpeg_skip_ff(j_decompress_ptr cinfo)
{
while (cinfo->src->bytes_in_buffer > 1
&& cinfo->src->next_input_byte[0] == 0xff
&& cinfo->src->next_input_byte[1] == 0xff) {
cinfo->src->bytes_in_buffer--;
cinfo->src->next_input_byte++;
}
}
/*******************************************************************
* *
* The following routines define a JPEG Destination manager *
* which just reads from a given buffer (instead of a file *
* as in the jpeg library) *
* *
*******************************************************************/
/*
* Initialize destination --- called by jpeg_start_compress
* before any data is actually written.
*/
static void init_destination(j_compress_ptr cinfo ATTRIBUTE_UNUSED)
{
/* No work necessary here */
}
/*
* Empty the output buffer --- called whenever buffer fills up.
*
* Should never be called since all data should be written to the buffer.
* If it gets called, the given jpeg buffer was too small.
*
*/
static boolean empty_output_buffer(j_compress_ptr cinfo)
{
/*FIXME: */
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Given jpeg buffer was too small");
ERREXIT (cinfo, JERR_BUFFER_SIZE); /* Shouldn't be FILE_WRITE but BUFFER_OVERRUN! */
return TRUE;
}
/*
* Terminate destination --- called by jpeg_finish_compress
* after all data has been written. Usually needs to flush buffer.
*
* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
* application must deal with any cleanup that should happen even
* for error exit.
*/
static void term_destination(j_compress_ptr cinfo ATTRIBUTE_UNUSED)
{
/* No work necessary here */
}
/*
* Prepare for output to a stdio stream.
* The caller must have already opened the stream, and is responsible
* for closing it after finishing compression.
*/
static void jpeg_buffer_dest(j_compress_ptr cinfo, unsigned char *buf, long len)
{
/*
* The destination object is made permanent so that multiple JPEG images
* can be written to the same file without re-executing jpeg_stdio_dest.
* This makes it dangerous to use this manager and a different destination
* manager serially with the same JPEG object, because their private object
* sizes may be different. Caveat programmer.
*/
if (cinfo->dest == NULL) { /* First time for this JPEG object? */
cinfo->dest = (struct jpeg_destination_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
sizeof (struct jpeg_destination_mgr));
}
cinfo->dest->init_destination = init_destination;
cinfo->dest->empty_output_buffer = empty_output_buffer;
cinfo->dest->term_destination = term_destination;
cinfo->dest->free_in_buffer = len;
cinfo->dest->next_output_byte = (JOCTET *) buf;
}
/*******************************************************************
* *
* decode_jpeg_data: Decode a (possibly interlaced) JPEG frame *
* *
*******************************************************************/
/*
* ERROR HANDLING:
*
* We want in all cases to return to the user.
* The following kind of error handling is from the
* example.c file in the Independent JPEG Group's JPEG software
*/
struct my_error_mgr {
struct jpeg_error_mgr pub; /* "public" fields */
jmp_buf setjmp_buffer; /* For return to caller */
/* Original emit_message method. */
JMETHOD(void, original_emit_message, (j_common_ptr cinfo, int msg_level));
/* Was a corrupt-data warning seen. */
int warning_seen;
};
static void my_error_exit(j_common_ptr cinfo)
{
/* cinfo->err really points to a my_error_mgr struct, so coerce pointer. */
struct my_error_mgr *myerr = (struct my_error_mgr *) cinfo->err;
/*
* Always display the message.
* We could postpone this until after returning, if we chose.
*/
(*cinfo->err->output_message) (cinfo);
/* Return control to the setjmp point. */
longjmp (myerr->setjmp_buffer, 1);
}
static void my_emit_message(j_common_ptr cinfo, int msg_level)
{
/* cinfo->err really points to a my_error_mgr struct, so coerce pointer. */
struct my_error_mgr *myerr = (struct my_error_mgr *) cinfo->err;
if (msg_level < 0)
myerr->warning_seen = 1;
/* Call original emit_message() */
(myerr->original_emit_message)(cinfo, msg_level);
}
#define MAX_LUMA_WIDTH 4096
#define MAX_CHROMA_WIDTH 2048
static unsigned char buf0[16][MAX_LUMA_WIDTH];
static unsigned char buf1[8][MAX_CHROMA_WIDTH];
static unsigned char buf2[8][MAX_CHROMA_WIDTH];
static unsigned char chr1[8][MAX_CHROMA_WIDTH];
static unsigned char chr2[8][MAX_CHROMA_WIDTH];
#if 1 /* Generation of 'std' Huffman tables... */
static void add_huff_table(j_decompress_ptr dinfo, JHUFF_TBL **htblptr,
const UINT8 *bits, const UINT8 *val)
/* Define a Huffman table */
{
int nsymbols, len;
if (*htblptr == NULL)
*htblptr = jpeg_alloc_huff_table((j_common_ptr) dinfo);
/* Copy the number-of-symbols-of-each-code-length counts. */
memcpy((*htblptr)->bits, bits, sizeof((*htblptr)->bits));
/*
* Validate the counts. We do this here mainly so we can copy the right
* number of symbols from the val[] array, without risking marching off
* the end of memory. jchuff.c will do a more thorough test later.
*/
nsymbols = 0;
for (len = 1; len <= 16; len++)
nsymbols += bits[len];
if (nsymbols < 1 || nsymbols > 256)
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Given jpeg buffer was too small");
memcpy((*htblptr)->huffval, val, nsymbols * sizeof(UINT8));
}
static void std_huff_tables (j_decompress_ptr dinfo)
/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
/* IMPORTANT: these are only valid for 8-bit data precision! */
{
static const UINT8 bits_dc_luminance[17] =
{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
static const UINT8 val_dc_luminance[] =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
static const UINT8 bits_dc_chrominance[17] =
{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
static const UINT8 val_dc_chrominance[] =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
static const UINT8 bits_ac_luminance[17] =
{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
static const UINT8 val_ac_luminance[] =
{ 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 UINT8 bits_ac_chrominance[17] =
{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
static const UINT8 val_ac_chrominance[] =
{ 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 };
add_huff_table(dinfo, &dinfo->dc_huff_tbl_ptrs[0],
bits_dc_luminance, val_dc_luminance);
add_huff_table(dinfo, &dinfo->ac_huff_tbl_ptrs[0],
bits_ac_luminance, val_ac_luminance);
add_huff_table(dinfo, &dinfo->dc_huff_tbl_ptrs[1],
bits_dc_chrominance, val_dc_chrominance);
add_huff_table(dinfo, &dinfo->ac_huff_tbl_ptrs[1],
bits_ac_chrominance, val_ac_chrominance);
}
static void guarantee_huff_tables(j_decompress_ptr dinfo)
{
if ((dinfo->dc_huff_tbl_ptrs[0] == NULL) &&
(dinfo->dc_huff_tbl_ptrs[1] == NULL) &&
(dinfo->ac_huff_tbl_ptrs[0] == NULL) &&
(dinfo->ac_huff_tbl_ptrs[1] == NULL)) {
std_huff_tables(dinfo);
}
}
#endif /* ...'std' Huffman table generation */
/*
* jpeg_data: Buffer with jpeg data to decode
* len: Length of buffer
* itype: 0: Not interlaced
* 1: Interlaced, Top field first
* 2: Interlaced, Bottom field first
* ctype Chroma format for decompression.
* Currently only Y4M_CHROMA_{420JPEG,422} are available
* returns:
* -1 on fatal error
* 0 on success
* 1 if jpeg lib threw a "corrupt jpeg data" warning.
* in this case, "a damaged output image is likely."
*
*/
int decode_jpeg_raw (unsigned char *jpeg_data, int len,
int itype, int ctype, unsigned int width,
unsigned int height, unsigned char *raw0,
unsigned char *raw1, unsigned char *raw2)
{
int numfields, hsf[3], field, yl, yc;
int i, xsl, xsc, xs, hdown;
unsigned int x, y = 0, vsf[3], xd;
JSAMPROW row0[16] = { buf0[0], buf0[1], buf0[2], buf0[3],
buf0[4], buf0[5], buf0[6], buf0[7],
buf0[8], buf0[9], buf0[10], buf0[11],
buf0[12], buf0[13], buf0[14], buf0[15]};
JSAMPROW row1[8] = { buf1[0], buf1[1], buf1[2], buf1[3],
buf1[4], buf1[5], buf1[6], buf1[7]};
JSAMPROW row2[16] = { buf2[0], buf2[1], buf2[2], buf2[3],
buf2[4], buf2[5], buf2[6], buf2[7]};
JSAMPROW row1_444[16], row2_444[16];
JSAMPARRAY scanarray[3] = { row0, row1, row2};
struct jpeg_decompress_struct dinfo;
struct my_error_mgr jerr;
/* We set up the normal JPEG error routines, then override error_exit. */
dinfo.err = jpeg_std_error (&jerr.pub);
jerr.pub.error_exit = my_error_exit;
/* Also hook the emit_message routine to note corrupt-data warnings. */
jerr.original_emit_message = jerr.pub.emit_message;
jerr.pub.emit_message = my_emit_message;
jerr.warning_seen = 0;
/* Establish the setjmp return context for my_error_exit to use. */
if (setjmp (jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error. */
jpeg_destroy_decompress (&dinfo);
return 1;
}
jpeg_create_decompress (&dinfo);
jpeg_buffer_src (&dinfo, jpeg_data, len);
/*
* Read header, make some checks and try to figure out what the
* user really wants.
*/
jpeg_read_header (&dinfo, TRUE);
dinfo.raw_data_out = TRUE;
#if JPEG_LIB_VERSION >= 70
dinfo.do_fancy_upsampling = FALSE;
#endif
dinfo.out_color_space = JCS_YCbCr;
dinfo.dct_method = JDCT_IFAST;
guarantee_huff_tables(&dinfo);
jpeg_start_decompress (&dinfo);
if (dinfo.output_components != 3) {
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Output components of JPEG image"
" = %d, must be 3", dinfo.output_components);
goto ERR_EXIT;
}
for (i = 0; i < 3; i++) {
hsf[i] = dinfo.comp_info[i].h_samp_factor;
vsf[i] = dinfo.comp_info[i].v_samp_factor;
}
if ((hsf[0] != 2 && hsf[0] != 1) || hsf[1] != 1 || hsf[2] != 1 ||
(vsf[0] != 1 && vsf[0] != 2) || vsf[1] != 1 || vsf[2] != 1) {
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Unsupported sampling factors,"
" hsf=(%d, %d, %d) vsf=(%d, %d, %d) !", hsf[0], hsf[1],
hsf[2], vsf[0], vsf[1], vsf[2]);
goto ERR_EXIT;
}
if (hsf[0] == 1) {
if (height % 8 != 0) {
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: YUV 4:4:4 sampling, but image"
" height %d not dividable by 8 !", height);
goto ERR_EXIT;
}
for (y = 0; y < 16; y++) { // Allocate a special buffer for the extra sampling depth.
row1_444[y] = (unsigned char *)malloc(dinfo.output_width * sizeof(char));
row2_444[y] = (unsigned char *)malloc(dinfo.output_width * sizeof(char));
}
scanarray[1] = row1_444;
scanarray[2] = row2_444;
}
/* Height match image height or be exact twice the image height. */
if (dinfo.output_height == height) {
numfields = 1;
} else if (2 * dinfo.output_height == height) {
numfields = 2;
} else {
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Read JPEG: requested height = %d, "
"height of image = %d", height, dinfo.output_height);
goto ERR_EXIT;
}
/* Width is more flexible */
if (dinfo.output_width > MAX_LUMA_WIDTH) {
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Image width of %d exceeds max",
dinfo.output_width);
goto ERR_EXIT;
}
if (width < 2 * dinfo.output_width / 3) {
/* Downsample 2:1 */
hdown = 1;
if (2 * width < dinfo.output_width)
xsl = (dinfo.output_width - 2 * width) / 2;
else
xsl = 0;
} else if (width == 2 * dinfo.output_width / 3) {
/* Special case of 3:2 downsampling */
hdown = 2;
xsl = 0;
} else {
/* No downsampling */
hdown = 0;
if (width < dinfo.output_width)
xsl = (dinfo.output_width - width) / 2;
else
xsl = 0;
}
/* Make xsl even, calculate xsc */
xsl = xsl & ~1;
xsc = xsl / 2;
yl = yc = 0;
for (field = 0; field < numfields; field++) {
if (field > 0) {
jpeg_read_header (&dinfo, TRUE);
dinfo.raw_data_out = TRUE;
#if JPEG_LIB_VERSION >= 70
dinfo.do_fancy_upsampling = FALSE;
#endif
dinfo.out_color_space = JCS_YCbCr;
dinfo.dct_method = JDCT_IFAST;
jpeg_start_decompress (&dinfo);
}
if (numfields == 2) {
switch (itype) {
case Y4M_ILACE_TOP_FIRST:
yl = yc = field;
break;
case Y4M_ILACE_BOTTOM_FIRST:
yl = yc = (1 - field);
break;
default:
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Input is interlaced but"
" no interlacing set");
goto ERR_EXIT;
}
} else {
yl = yc = 0;
}
while (dinfo.output_scanline < dinfo.output_height) {
/* Read raw data */
jpeg_read_raw_data (&dinfo, scanarray, 8 * vsf[0]);
for (y = 0; y < 8 * vsf[0]; yl += numfields, y++) {
xd = yl * width;
xs = xsl;
if (hdown == 0) {
for (x = 0; x < width; x++)
raw0[xd++] = row0[y][xs++];
} else if (hdown == 1) {
for (x = 0; x < width; x++, xs += 2)
raw0[xd++] = (row0[y][xs] + row0[y][xs + 1]) >> 1;
} else {
for (x = 0; x < width / 2; x++, xd += 2, xs += 3) {
raw0[xd] = (2 * row0[y][xs] + row0[y][xs + 1]) / 3;
raw0[xd + 1] = (2 * row0[y][xs + 2] + row0[y][xs + 1]) / 3;
}
}
}
/* Horizontal downsampling of chroma */
for (y = 0; y < 8; y++) {
xs = xsc;
if (hsf[0] == 1)
for (x = 0; x < width / 2; x++, xs++) {
row1[y][xs] = (row1_444[y][2*x] + row1_444[y][2*x + 1]) >> 1;
row2[y][xs] = (row2_444[y][2*x] + row2_444[y][2*x + 1]) >> 1;
}
xs = xsc;
if (hdown == 0) {
for (x = 0; x < width / 2; x++, xs++) {
chr1[y][x] = row1[y][xs];
chr2[y][x] = row2[y][xs];
}
} else if (hdown == 1) {
for (x = 0; x < width / 2; x++, xs += 2) {
chr1[y][x] = (row1[y][xs] + row1[y][xs + 1]) >> 1;
chr2[y][x] = (row2[y][xs] + row2[y][xs + 1]) >> 1;
}
} else {
for (x = 0; x < width / 2; x += 2, xs += 3) {
chr1[y][x] = (2 * row1[y][xs] + row1[y][xs + 1]) / 3;
chr1[y][x + 1] = (2 * row1[y][xs + 2] + row1[y][xs + 1]) / 3;
chr2[y][x] = (2 * row2[y][xs] + row2[y][xs + 1]) / 3;
chr2[y][x + 1] = (2 * row2[y][xs + 2] + row2[y][xs + 1]) / 3;
}
}
}
/* Vertical resampling of chroma */
switch (ctype) {
case Y4M_CHROMA_422:
if (vsf[0] == 1) {
/* Just copy */
for (y = 0; y < 8 /*&& yc < height */; y++, yc += numfields) {
xd = yc * width / 2;
for (x = 0; x < width / 2; x++, xd++) {
raw1[xd] = chr1[y][x];
raw2[xd] = chr2[y][x];
}
}
} else {
/* upsample */
for (y = 0; y < 8 /*&& yc < height */; y++) {
xd = yc * width / 2;
for (x = 0; x < width / 2; x++, xd++) {
raw1[xd] = chr1[y][x];
raw2[xd] = chr2[y][x];
}
yc += numfields;
xd = yc * width / 2;
for (x = 0; x < width / 2; x++, xd++) {
raw1[xd] = chr1[y][x];
raw2[xd] = chr2[y][x];
}
yc += numfields;
}
}
break;
default:
/*
* Should be case Y4M_CHROMA_420JPEG: but use default: for compatibility. Some
* pass things like '420' in with the expectation that anything other than
* Y4M_CHROMA_422 will default to 420JPEG.
*/
if (vsf[0] == 1) {
/* Really downsample */
for (y = 0; y < 8 /*&& yc < height/2*/; y += 2, yc += numfields) {
xd = yc * width / 2;
for (x = 0; x < width / 2; x++, xd++) {
assert(xd < (width * height / 4));
raw1[xd] = (chr1[y][x] + chr1[y + 1][x]) >> 1;
raw2[xd] = (chr2[y][x] + chr2[y + 1][x]) >> 1;
}
}
} else {
/* Just copy */
for (y = 0; y < 8 /* && yc < height / 2 */; y++, yc += numfields) {
xd = yc * width / 2;
for (x = 0; x < width / 2; x++, xd++) {
raw1[xd] = chr1[y][x];
raw2[xd] = chr2[y][x];
}
}
}
break;
}
}
(void) jpeg_finish_decompress (&dinfo);
if (field == 0 && numfields > 1)
jpeg_skip_ff (&dinfo);
}
if (hsf[0] == 1) {
for (y = 0; y < 16; y++) { // Allocate a special buffer for the extra sampling depth.
free(row1_444[y]);
free(row2_444[y]);
}
}
jpeg_destroy_decompress (&dinfo);
if (jerr.warning_seen)
return 1;
else
return 0;
ERR_EXIT:
jpeg_destroy_decompress (&dinfo);
return -1;
}
/*
* jpeg_data: Buffer with jpeg data to decode, must be grayscale mode
* len: Length of buffer
* itype: 0: Not interlaced
* 1: Interlaced, Top field first
* 2: Interlaced, Bottom field first
* ctype Chroma format for decompression.
* Currently only Y4M_CHROMA_{420JPEG,422} are available
*/
int decode_jpeg_gray_raw(unsigned char *jpeg_data, int len,
int itype, int ctype, unsigned int width,
unsigned int height, unsigned char *raw0,
unsigned char *raw1, unsigned char *raw2)
{
int numfields, field, yl, yc, xsl, xsc, xs, xd, hdown;
unsigned int x, y, vsf[3];
JSAMPROW row0[16] = { buf0[0], buf0[1], buf0[2], buf0[3],
buf0[4], buf0[5], buf0[6], buf0[7],
buf0[8], buf0[9], buf0[10], buf0[11],
buf0[12], buf0[13], buf0[14], buf0[15]};
JSAMPARRAY scanarray[3] = { row0 };
struct jpeg_decompress_struct dinfo;
struct my_error_mgr jerr;
/* We set up the normal JPEG error routines, then override error_exit. */
dinfo.err = jpeg_std_error (&jerr.pub);
jerr.pub.error_exit = my_error_exit;
/* Establish the setjmp return context for my_error_exit to use. */
if (setjmp (jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error. */
jpeg_destroy_decompress (&dinfo);
return -1;
}
jpeg_create_decompress (&dinfo);
jpeg_buffer_src (&dinfo, jpeg_data, len);
/*
* Read header, make some checks and try to figure out what the
* user really wants.
*/
jpeg_read_header (&dinfo, TRUE);
dinfo.raw_data_out = TRUE;
#if JPEG_LIB_VERSION >= 70
dinfo.do_fancy_upsampling = FALSE;
#endif
dinfo.out_color_space = JCS_GRAYSCALE;
dinfo.dct_method = JDCT_IFAST;
if (dinfo.jpeg_color_space != JCS_GRAYSCALE) {
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Expected grayscale colorspace"
" for JPEG raw decoding");
goto ERR_EXIT;
}
guarantee_huff_tables(&dinfo);
jpeg_start_decompress (&dinfo);
vsf[0]= 1; vsf[1] = 1; vsf[2] = 1;
/* Height match image height or be exact twice the image height. */
if (dinfo.output_height == height) {
numfields = 1;
} else if (2 * dinfo.output_height == height) {
numfields = 2;
} else {
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Read JPEG: requested height = %d, "
"height of image = %d", height, dinfo.output_height);
goto ERR_EXIT;
}
/* Width is more flexible */
if (dinfo.output_width > MAX_LUMA_WIDTH) {
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Image width of %d exceeds max",
dinfo.output_width);
goto ERR_EXIT;
}
if (width < 2 * dinfo.output_width / 3) {
/* Downsample 2:1 */
hdown = 1;
if (2 * width < dinfo.output_width)
xsl = (dinfo.output_width - 2 * width) / 2;
else
xsl = 0;
} else if (width == 2 * dinfo.output_width / 3) {
/* special case of 3:2 downsampling */
hdown = 2;
xsl = 0;
} else {
/* No downsampling */
hdown = 0;
if (width < dinfo.output_width)
xsl = (dinfo.output_width - width) / 2;
else
xsl = 0;
}
/* Make xsl even, calculate xsc */
xsl = xsl & ~1;
xsc = xsl / 2;
yl = yc = 0;
for (field = 0; field < numfields; field++) {
if (field > 0) {
jpeg_read_header (&dinfo, TRUE);
dinfo.raw_data_out = TRUE;
#if JPEG_LIB_VERSION >= 70
dinfo.do_fancy_upsampling = FALSE;
#endif
dinfo.out_color_space = JCS_GRAYSCALE;
dinfo.dct_method = JDCT_IFAST;
jpeg_start_decompress (&dinfo);
}
if (numfields == 2) {
switch (itype) {
case Y4M_ILACE_TOP_FIRST:
yl = yc = field;
break;
case Y4M_ILACE_BOTTOM_FIRST:
yl = yc = (1 - field);
break;
default:
MOTION_LOG(ERR, TYPE_ALL, NO_ERRNO, "%s: Input is interlaced"
" but no interlacing set");
goto ERR_EXIT;
}
} else {
yl = yc = 0;
}
while (dinfo.output_scanline < dinfo.output_height) {
jpeg_read_raw_data (&dinfo, scanarray, 16);
for (y = 0; y < 8 * vsf[0]; yl += numfields, y++) {
xd = yl * width;
xs = xsl;
if (hdown == 0) { // No horiz downsampling
for (x = 0; x < width; x++)
raw0[xd++] = row0[y][xs++];
} else if (hdown == 1) { // Half the res
for (x = 0; x < width; x++, xs += 2)
raw0[xd++] = (row0[y][xs] + row0[y][xs + 1]) >> 1;
} else { // 2:3 downsampling
for (x = 0; x < width / 2; x++, xd += 2, xs += 3) {
raw0[xd] = (2 * row0[y][xs] + row0[y][xs + 1]) / 3;
raw0[xd + 1] = (2 * row0[y][xs + 2] + row0[y][xs + 1]) / 3;
}
}
}
for (y = 0; y < 8; y++) {
xs = xsc;
if (hdown == 0) {
for (x = 0; x < width / 2; x++, xs++) {
chr1[y][x] = 0; //row1[y][xs];
chr2[y][x] = 0; //row2[y][xs];
}
} else if (hdown == 1) {
for (x = 0; x < width / 2; x++, xs += 2) {
chr1[y][x] = 0; //(row1[y][xs] + row1[y][xs + 1]) >> 1;
chr2[y][x] = 0; //(row2[y][xs] + row2[y][xs + 1]) >> 1;
}
} else {
for (x = 0; x < width / 2; x += 2, xs += 3) {
chr1[y][x] = 0; //(2 * row1[y][xs] + row1[y][xs + 1]) / 3;
chr1[y][x + 1] = 0;
//(2 * row1[y][xs + 2] + row1[y][xs + 1]) / 3;
chr2[y][x] = 0; // (2 * row2[y][xs] + row2[y][xs + 1]) / 3;
chr2[y][x + 1] = 0;
//(2 * row2[y][xs + 2] + row2[y][xs + 1]) / 3;
}
}
}
switch (ctype) {
case Y4M_CHROMA_422:
if (vsf[0] == 1) {
/* Just copy */
for (y = 0; y < 8 /* && yc < height */; y++, yc += numfields) {
xd = yc * width / 2;
for (x = 0; x < width / 2; x++, xd++) {
raw1[xd] = 127; //chr1[y][x];
raw2[xd] = 127; //chr2[y][x];
}
}
} else {
/* upsample */
for (y = 0; y < 8 /* && yc < height */; y++) {
xd = yc * width / 2;
for (x = 0; x < width / 2; x++, xd++) {
raw1[xd] = 127; //chr1[y][x];
raw2[xd] = 127; //chr2[y][x];
}
yc += numfields;
xd = yc * width / 2;
for (x = 0; x < width / 2; x++, xd++) {
raw1[xd] = 127; //chr1[y][x];
raw2[xd] = 127; //chr2[y][x];
}
yc += numfields;
}
}
break;
/*
* Should be case Y4M_CHROMA_420JPEG: but use default: for compatibility. Some
* pass things like '420' in with the expectation that anything other than
* Y4M_CHROMA_422 will default to 420JPEG.
*/
default:
if (vsf[0] == 1) {
/* Really downsample */
for (y = 0; y < 8; y += 2, yc += numfields) {
xd = yc * width / 2;
for (x = 0; x < width / 2; x++, xd++) {
raw1[xd] = 127; //(chr1[y][x] + chr1[y + 1][x]) >> 1;
raw2[xd] = 127; //(chr2[y][x] + chr2[y + 1][x]) >> 1;
}
}
} else {
/* Just copy */
for (y = 0; y < 8; y++, yc += numfields) {
xd = yc * width / 2;