virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-21 10:55:51 +02:00
Code Issues Releases Activity
ce2749d2c4
FFmpeg/libavcodec/mjpeg.c
Alex Beregszaszi ce2749d2c4 simplified 
Originally committed as revision 1655 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-03-09 16:07:19 +00:00

1697 lines
47 KiB
C
Raw Blame History

/*
* MJPEG encoder and decoder
* Copyright (c) 2000, 2001 Fabrice Bellard.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Support for external huffman table, various fixes (AVID workaround),
* aspecting, new decode_frame mechanism and apple mjpeg-b support
* by Alex Beregszaszi <alex@naxine.org>
*/
/**
* @file mjpeg.c
* MJPEG encoder and decoder.
*/
//#define DEBUG
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
/* use two quantizer tables (one for luminance and one for chrominance) */
/* not yet working */
#undef TWOMATRIXES
typedef struct MJpegContext {
uint8_t huff_size_dc_luminance[12];
uint16_t huff_code_dc_luminance[12];
uint8_t huff_size_dc_chrominance[12];
uint16_t huff_code_dc_chrominance[12];
uint8_t huff_size_ac_luminance[256];
uint16_t huff_code_ac_luminance[256];
uint8_t huff_size_ac_chrominance[256];
uint16_t huff_code_ac_chrominance[256];
} MJpegContext;
/* JPEG marker codes */
typedef enum {
/* start of frame */
SOF0 = 0xc0, /* baseline */
SOF1 = 0xc1, /* extended sequential, huffman */
SOF2 = 0xc2, /* progressive, huffman */
SOF3 = 0xc3, /* lossless, huffman */
SOF5 = 0xc5, /* differential sequential, huffman */
SOF6 = 0xc6, /* differential progressive, huffman */
SOF7 = 0xc7, /* differential lossless, huffman */
JPG = 0xc8, /* reserved for JPEG extension */
SOF9 = 0xc9, /* extended sequential, arithmetic */
SOF10 = 0xca, /* progressive, arithmetic */
SOF11 = 0xcb, /* lossless, arithmetic */
SOF13 = 0xcd, /* differential sequential, arithmetic */
SOF14 = 0xce, /* differential progressive, arithmetic */
SOF15 = 0xcf, /* differential lossless, arithmetic */
DHT = 0xc4, /* define huffman tables */
DAC = 0xcc, /* define arithmetic-coding conditioning */
/* restart with modulo 8 count "m" */
RST0 = 0xd0,
RST1 = 0xd1,
RST2 = 0xd2,
RST3 = 0xd3,
RST4 = 0xd4,
RST5 = 0xd5,
RST6 = 0xd6,
RST7 = 0xd7,
SOI = 0xd8, /* start of image */
EOI = 0xd9, /* end of image */
SOS = 0xda, /* start of scan */
DQT = 0xdb, /* define quantization tables */
DNL = 0xdc, /* define number of lines */
DRI = 0xdd, /* define restart interval */
DHP = 0xde, /* define hierarchical progression */
EXP = 0xdf, /* expand reference components */
APP0 = 0xe0,
APP1 = 0xe1,
APP2 = 0xe2,
APP3 = 0xe3,
APP4 = 0xe4,
APP5 = 0xe5,
APP6 = 0xe6,
APP7 = 0xe7,
APP8 = 0xe8,
APP9 = 0xe9,
APP10 = 0xea,
APP11 = 0xeb,
APP12 = 0xec,
APP13 = 0xed,
APP14 = 0xee,
APP15 = 0xef,
JPG0 = 0xf0,
JPG1 = 0xf1,
JPG2 = 0xf2,
JPG3 = 0xf3,
JPG4 = 0xf4,
JPG5 = 0xf5,
JPG6 = 0xf6,
JPG7 = 0xf7,
JPG8 = 0xf8,
JPG9 = 0xf9,
JPG10 = 0xfa,
JPG11 = 0xfb,
JPG12 = 0xfc,
JPG13 = 0xfd,
COM = 0xfe, /* comment */
TEM = 0x01, /* temporary private use for arithmetic coding */
/* 0x02 -> 0xbf reserved */
} JPEG_MARKER;
#if 0
/* These are the sample quantization tables given in JPEG spec section K.1.
* The spec says that the values given produce "good" quality, and
* when divided by 2, "very good" quality.
*/
static const unsigned char std_luminance_quant_tbl[64] = {
16, 11, 10, 16, 24, 40, 51, 61,
12, 12, 14, 19, 26, 58, 60, 55,
14, 13, 16, 24, 40, 57, 69, 56,
14, 17, 22, 29, 51, 87, 80, 62,
18, 22, 37, 56, 68, 109, 103, 77,
24, 35, 55, 64, 81, 104, 113, 92,
49, 64, 78, 87, 103, 121, 120, 101,
72, 92, 95, 98, 112, 100, 103, 99
};
static const unsigned char std_chrominance_quant_tbl[64] = {
17, 18, 24, 47, 99, 99, 99, 99,
18, 21, 26, 66, 99, 99, 99, 99,
24, 26, 56, 99, 99, 99, 99, 99,
47, 66, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99
};
#endif
/* 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_t 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_t val_dc_luminance[] =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
static const uint8_t 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_t val_dc_chrominance[] =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
static const uint8_t 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_t 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_t 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_t 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
};
/* isn't this function nicer than the one in the libjpeg ? */
static void build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
const uint8_t *bits_table, const uint8_t *val_table)
{
int i, j, k,nb, code, sym;
code = 0;
k = 0;
for(i=1;i<=16;i++) {
nb = bits_table[i];
for(j=0;j<nb;j++) {
sym = val_table[k++];
huff_size[sym] = i;
huff_code[sym] = code;
code++;
}
code <<= 1;
}
}
int mjpeg_init(MpegEncContext *s)
{
MJpegContext *m;
m = av_malloc(sizeof(MJpegContext));
if (!m)
return -1;
s->min_qcoeff=-1023;
s->max_qcoeff= 1023;
s->intra_quant_bias= 1<<(QUANT_BIAS_SHIFT-1); //(a + x/2)/x
/* build all the huffman tables */
build_huffman_codes(m->huff_size_dc_luminance,
m->huff_code_dc_luminance,
bits_dc_luminance,
val_dc_luminance);
build_huffman_codes(m->huff_size_dc_chrominance,
m->huff_code_dc_chrominance,
bits_dc_chrominance,
val_dc_chrominance);
build_huffman_codes(m->huff_size_ac_luminance,
m->huff_code_ac_luminance,
bits_ac_luminance,
val_ac_luminance);
build_huffman_codes(m->huff_size_ac_chrominance,
m->huff_code_ac_chrominance,
bits_ac_chrominance,
val_ac_chrominance);
s->mjpeg_ctx = m;
return 0;
}
void mjpeg_close(MpegEncContext *s)
{
av_free(s->mjpeg_ctx);
}
static inline void put_marker(PutBitContext *p, int code)
{
put_bits(p, 8, 0xff);
put_bits(p, 8, code);
}
/* table_class: 0 = DC coef, 1 = AC coefs */
static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
const uint8_t *bits_table, const uint8_t *value_table)
{
PutBitContext *p = &s->pb;
int n, i;
put_bits(p, 4, table_class);
put_bits(p, 4, table_id);
n = 0;
for(i=1;i<=16;i++) {
n += bits_table[i];
put_bits(p, 8, bits_table[i]);
}
for(i=0;i<n;i++)
put_bits(p, 8, value_table[i]);
return n + 17;
}
static void jpeg_table_header(MpegEncContext *s)
{
PutBitContext *p = &s->pb;
int i, j, size;
uint8_t *ptr;
/* quant matrixes */
put_marker(p, DQT);
#ifdef TWOMATRIXES
put_bits(p, 16, 2 + 2 * (1 + 64));
#else
put_bits(p, 16, 2 + 1 * (1 + 64));
#endif
put_bits(p, 4, 0); /* 8 bit precision */
put_bits(p, 4, 0); /* table 0 */
for(i=0;i<64;i++) {
j = s->intra_scantable.permutated[i];
put_bits(p, 8, s->intra_matrix[j]);
}
#ifdef TWOMATRIXES
put_bits(p, 4, 0); /* 8 bit precision */
put_bits(p, 4, 1); /* table 1 */
for(i=0;i<64;i++) {
j = s->intra_scantable.permutated[i];
put_bits(p, 8, s->chroma_intra_matrix[j]);
}
#endif
/* huffman table */
put_marker(p, DHT);
flush_put_bits(p);
ptr = pbBufPtr(p);
put_bits(p, 16, 0); /* patched later */
size = 2;
size += put_huffman_table(s, 0, 0, bits_dc_luminance, val_dc_luminance);
size += put_huffman_table(s, 0, 1, bits_dc_chrominance, val_dc_chrominance);
size += put_huffman_table(s, 1, 0, bits_ac_luminance, val_ac_luminance);
size += put_huffman_table(s, 1, 1, bits_ac_chrominance, val_ac_chrominance);
ptr[0] = size >> 8;
ptr[1] = size;
}
static void jpeg_put_comments(MpegEncContext *s)
{
PutBitContext *p = &s->pb;
int size;
uint8_t *ptr;
if (s->aspect_ratio_info)
{
/* JFIF header */
put_marker(p, APP0);
put_bits(p, 16, 16);
put_string(p, "JFIF"); /* this puts the trailing zero-byte too */
put_bits(p, 16, 0x0201); /* v 1.02 */
put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
switch(s->aspect_ratio_info)
{
case FF_ASPECT_4_3_625:
case FF_ASPECT_4_3_525:
put_bits(p, 16, 4);
put_bits(p, 16, 3);
break;
case FF_ASPECT_16_9_625:
case FF_ASPECT_16_9_525:
put_bits(p, 16, 16);
put_bits(p, 16, 9);
break;
case FF_ASPECT_EXTENDED:
put_bits(p, 16, s->aspected_width);
put_bits(p, 16, s->aspected_height);
break;
case FF_ASPECT_SQUARE:
default:
put_bits(p, 16, 1); /* aspect: 1:1 */
put_bits(p, 16, 1);
break;
}
put_bits(p, 8, 0); /* thumbnail width */
put_bits(p, 8, 0); /* thumbnail height */
}
/* comment */
if(!(s->flags & CODEC_FLAG_BITEXACT)){
put_marker(p, COM);
flush_put_bits(p);
ptr = pbBufPtr(p);
put_bits(p, 16, 0); /* patched later */
put_string(p, LIBAVCODEC_IDENT);
size = strlen(LIBAVCODEC_IDENT)+3;
ptr[0] = size >> 8;
ptr[1] = size;
}
}
void mjpeg_picture_header(MpegEncContext *s)
{
put_marker(&s->pb, SOI);
if (!s->mjpeg_data_only_frames)
{
jpeg_put_comments(s);
if (s->mjpeg_write_tables) jpeg_table_header(s);
put_marker(&s->pb, SOF0);
put_bits(&s->pb, 16, 17);
put_bits(&s->pb, 8, 8); /* 8 bits/component */
put_bits(&s->pb, 16, s->height);
put_bits(&s->pb, 16, s->width);
put_bits(&s->pb, 8, 3); /* 3 components */
/* Y component */
put_bits(&s->pb, 8, 1); /* component number */
put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
put_bits(&s->pb, 8, 0); /* select matrix */
/* Cb component */
put_bits(&s->pb, 8, 2); /* component number */
put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
#ifdef TWOMATRIXES
put_bits(&s->pb, 8, 1); /* select matrix */
#else
put_bits(&s->pb, 8, 0); /* select matrix */
#endif
/* Cr component */
put_bits(&s->pb, 8, 3); /* component number */
put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
#ifdef TWOMATRIXES
put_bits(&s->pb, 8, 1); /* select matrix */
#else
put_bits(&s->pb, 8, 0); /* select matrix */
#endif
}
/* scan header */
put_marker(&s->pb, SOS);
put_bits(&s->pb, 16, 12); /* length */
put_bits(&s->pb, 8, 3); /* 3 components */
/* Y component */
put_bits(&s->pb, 8, 1); /* index */
put_bits(&s->pb, 4, 0); /* DC huffman table index */
put_bits(&s->pb, 4, 0); /* AC huffman table index */
/* Cb component */
put_bits(&s->pb, 8, 2); /* index */
put_bits(&s->pb, 4, 1); /* DC huffman table index */
put_bits(&s->pb, 4, 1); /* AC huffman table index */
/* Cr component */
put_bits(&s->pb, 8, 3); /* index */
put_bits(&s->pb, 4, 1); /* DC huffman table index */
put_bits(&s->pb, 4, 1); /* AC huffman table index */
put_bits(&s->pb, 8, 0); /* Ss (not used) */
put_bits(&s->pb, 8, 63); /* Se (not used) */
put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
}
static void escape_FF(MpegEncContext *s, int start)
{
int size= get_bit_count(&s->pb) - start*8;
int i, ff_count;
uint8_t *buf= s->pb.buf + start;
int align= (-(int)(buf))&3;
assert((size&7) == 0);
size >>= 3;
ff_count=0;
for(i=0; i<size && i<align; i++){
if(buf[i]==0xFF) ff_count++;
}
for(; i<size-15; i+=16){
int acc, v;
v= *(uint32_t*)(&buf[i]);
acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
v= *(uint32_t*)(&buf[i+4]);
acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
v= *(uint32_t*)(&buf[i+8]);
acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
v= *(uint32_t*)(&buf[i+12]);
acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
acc>>=4;
acc+= (acc>>16);
acc+= (acc>>8);
ff_count+= acc&0xFF;
}
for(; i<size; i++){
if(buf[i]==0xFF) ff_count++;
}
if(ff_count==0) return;
/* skip put bits */
for(i=0; i<ff_count-3; i+=4)
put_bits(&s->pb, 32, 0);
put_bits(&s->pb, (ff_count-i)*8, 0);
flush_put_bits(&s->pb);
for(i=size-1; ff_count; i--){
int v= buf[i];
if(v==0xFF){
//printf("%d %d\n", i, ff_count);
buf[i+ff_count]= 0;
ff_count--;
}
buf[i+ff_count]= v;
}
}
void mjpeg_picture_trailer(MpegEncContext *s)
{
int pad= (-get_bit_count(&s->pb))&7;
put_bits(&s->pb, pad,0xFF>>(8-pad));
flush_put_bits(&s->pb);
assert((s->header_bits&7)==0);
escape_FF(s, s->header_bits>>3);
put_marker(&s->pb, EOI);
}
static inline void mjpeg_encode_dc(MpegEncContext *s, int val,
uint8_t *huff_size, uint16_t *huff_code)
{
int mant, nbits;
if (val == 0) {
put_bits(&s->pb, huff_size[0], huff_code[0]);
} else {
mant = val;
if (val < 0) {
val = -val;
mant--;
}
/* compute the log (XXX: optimize) */
nbits = 0;
while (val != 0) {
val = val >> 1;
nbits++;
}
put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
}
}
static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
{
int mant, nbits, code, i, j;
int component, dc, run, last_index, val;
MJpegContext *m = s->mjpeg_ctx;
uint8_t *huff_size_ac;
uint16_t *huff_code_ac;
/* DC coef */
component = (n <= 3 ? 0 : n - 4 + 1);
dc = block[0]; /* overflow is impossible */
val = dc - s->last_dc[component];
if (n < 4) {
mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
huff_size_ac = m->huff_size_ac_luminance;
huff_code_ac = m->huff_code_ac_luminance;
} else {
mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
huff_size_ac = m->huff_size_ac_chrominance;
huff_code_ac = m->huff_code_ac_chrominance;
}
s->last_dc[component] = dc;
/* AC coefs */
run = 0;
last_index = s->block_last_index[n];
for(i=1;i<=last_index;i++) {
j = s->intra_scantable.permutated[i];
val = block[j];
if (val == 0) {
run++;
} else {
while (run >= 16) {
put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
run -= 16;
}
mant = val;
if (val < 0) {
val = -val;
mant--;
}
/* compute the log (XXX: optimize) */
nbits = 0;
while (val != 0) {
val = val >> 1;
nbits++;
}
code = (run << 4) | nbits;
put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
run = 0;
}
}
/* output EOB only if not already 64 values */
if (last_index < 63 || run != 0)
put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
}
void mjpeg_encode_mb(MpegEncContext *s,
DCTELEM block[6][64])
{
int i;
for(i=0;i<6;i++) {
encode_block(s, block[i], i);
}
}
/******************************************/
/* decoding */
#define MAX_COMPONENTS 4
typedef struct MJpegDecodeContext {
AVCodecContext *avctx;
GetBitContext gb;
int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
int start_code; /* current start code */
int buffer_size;
uint8_t *buffer;
int16_t quant_matrixes[4][64];
VLC vlcs[2][4];
int org_width, org_height; /* size given at codec init */
int first_picture; /* true if decoding first picture */
int interlaced; /* true if interlaced */
int bottom_field; /* true if bottom field */
int width, height;
int nb_components;
int component_id[MAX_COMPONENTS];
int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
int v_count[MAX_COMPONENTS];
int h_max, v_max; /* maximum h and v counts */
int quant_index[4]; /* quant table index for each component */
int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
uint8_t *current_picture[MAX_COMPONENTS]; /* picture structure */
int linesize[MAX_COMPONENTS];
DCTELEM block[64] __align8;
ScanTable scantable;
void (*idct_put)(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/);
int restart_interval;
int restart_count;
int buggy_avid;
int interlace_polarity;
} MJpegDecodeContext;
static int mjpeg_decode_dht(MJpegDecodeContext *s);
static void build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table,
int nb_codes)
{
uint8_t huff_size[256];
uint16_t huff_code[256];
memset(huff_size, 0, sizeof(huff_size));
build_huffman_codes(huff_size, huff_code, bits_table, val_table);
init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2);
}
static int mjpeg_decode_init(AVCodecContext *avctx)
{
MJpegDecodeContext *s = avctx->priv_data;
MpegEncContext s2;
s->avctx = avctx;
/* ugly way to get the idct & scantable FIXME */
memset(&s2, 0, sizeof(MpegEncContext));
s2.flags= avctx->flags;
s2.avctx= avctx;
// s2->out_format = FMT_MJPEG;
s2.width = 8;
s2.height = 8;
if (MPV_common_init(&s2) < 0)
return -1;
s->scantable= s2.intra_scantable;
s->idct_put= s2.dsp.idct_put;
MPV_common_end(&s2);
s->mpeg_enc_ctx_allocated = 0;
s->buffer_size = 102400; /* smaller buffer should be enough,
but photojpg files could ahive bigger sizes */
s->buffer = av_malloc(s->buffer_size);
if (!s->buffer)
return -1;
s->start_code = -1;
s->first_picture = 1;
s->org_width = avctx->width;
s->org_height = avctx->height;
build_vlc(&s->vlcs[0][0], bits_dc_luminance, val_dc_luminance, 12);
build_vlc(&s->vlcs[0][1], bits_dc_chrominance, val_dc_chrominance, 12);
build_vlc(&s->vlcs[1][0], bits_ac_luminance, val_ac_luminance, 251);
build_vlc(&s->vlcs[1][1], bits_ac_chrominance, val_ac_chrominance, 251);
if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
{
printf("mjpeg: using external huffman table\n");
init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
mjpeg_decode_dht(s);
/* should check for error - but dunno */
}
return 0;
}
/* quantize tables */
static int mjpeg_decode_dqt(MJpegDecodeContext *s)
{
int len, index, i, j;
len = get_bits(&s->gb, 16) - 2;
while (len >= 65) {
/* only 8 bit precision handled */
if (get_bits(&s->gb, 4) != 0)
{
dprintf("dqt: 16bit precision\n");
return -1;
}
index = get_bits(&s->gb, 4);
if (index >= 4)
return -1;
dprintf("index=%d\n", index);
/* read quant table */
for(i=0;i<64;i++) {
j = s->scantable.permutated[i];
s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
}
len -= 65;
}
return 0;
}
/* decode huffman tables and build VLC decoders */
static int mjpeg_decode_dht(MJpegDecodeContext *s)
{
int len, index, i, class, n, v, code_max;
uint8_t bits_table[17];
uint8_t val_table[256];
len = get_bits(&s->gb, 16) - 2;
while (len > 0) {
if (len < 17)
return -1;
class = get_bits(&s->gb, 4);
if (class >= 2)
return -1;
index = get_bits(&s->gb, 4);
if (index >= 4)
return -1;
n = 0;
for(i=1;i<=16;i++) {
bits_table[i] = get_bits(&s->gb, 8);
n += bits_table[i];
}
len -= 17;
if (len < n || n > 256)
return -1;
code_max = 0;
for(i=0;i<n;i++) {
v = get_bits(&s->gb, 8);
if (v > code_max)
code_max = v;
val_table[i] = v;
}
len -= n;
/* build VLC and flush previous vlc if present */
free_vlc(&s->vlcs[class][index]);
dprintf("class=%d index=%d nb_codes=%d\n",
class, index, code_max + 1);
build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1);
}
return 0;
}
static int mjpeg_decode_sof0(MJpegDecodeContext *s)
{
int len, nb_components, i, width, height;
/* XXX: verify len field validity */
len = get_bits(&s->gb, 16);
/* only 8 bits/component accepted */
if (get_bits(&s->gb, 8) != 8)
return -1;
height = get_bits(&s->gb, 16);
width = get_bits(&s->gb, 16);
dprintf("sof0: picture: %dx%d\n", width, height);
nb_components = get_bits(&s->gb, 8);
if (nb_components <= 0 ||
nb_components > MAX_COMPONENTS)
return -1;
s->nb_components = nb_components;
s->h_max = 1;
s->v_max = 1;
for(i=0;i<nb_components;i++) {
/* component id */
s->component_id[i] = get_bits(&s->gb, 8) - 1;
s->h_count[i] = get_bits(&s->gb, 4);
s->v_count[i] = get_bits(&s->gb, 4);
/* compute hmax and vmax (only used in interleaved case) */
if (s->h_count[i] > s->h_max)
s->h_max = s->h_count[i];
if (s->v_count[i] > s->v_max)
s->v_max = s->v_count[i];
s->quant_index[i] = get_bits(&s->gb, 8);
if (s->quant_index[i] >= 4)
return -1;
dprintf("component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
s->v_count[i], s->component_id[i], s->quant_index[i]);
}
/* if different size, realloc/alloc picture */
/* XXX: also check h_count and v_count */
if (width != s->width || height != s->height) {
for(i=0;i<MAX_COMPONENTS;i++)
av_freep(&s->current_picture[i]);
s->width = width;
s->height = height;
/* test interlaced mode */
if (s->first_picture &&
s->org_height != 0 &&
s->height < ((s->org_height * 3) / 4)) {
s->interlaced = 1;
// s->bottom_field = (s->interlace_polarity) ? 1 : 0;
s->bottom_field = 0;
}
for(i=0;i<nb_components;i++) {
int w, h;
w = (s->width + 8 * s->h_max - 1) / (8 * s->h_max);
h = (s->height + 8 * s->v_max - 1) / (8 * s->v_max);
w = w * 8 * s->h_count[i];
h = h * 8 * s->v_count[i];
if (s->interlaced)
w *= 2;
s->linesize[i] = w;
s->current_picture[i] = av_mallocz(w * h);
if (!s->current_picture[i])
{
dprintf("error: no picture buffers allocated\n");
return -1;
}
}
s->first_picture = 0;
}
if (len != (8+(3*nb_components)))
{
dprintf("decode_sof0: error, len(%d) mismatch\n", len);
}
return 0;
}
static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
{
int code, diff;
#if 1
code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
#else
code = get_vlc(&s->gb, &s->vlcs[0][dc_index]);
#endif
if (code < 0)
{
dprintf("mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
&s->vlcs[0][dc_index]);
return 0xffff;
}
if (code == 0) {
diff = 0;
} else {
diff = get_bits(&s->gb, code);
if ((diff & (1 << (code - 1))) == 0)
diff = (-1 << code) | (diff + 1);
}
return diff;
}
/* decode block and dequantize */
static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
int component, int dc_index, int ac_index, int quant_index)
{
int nbits, code, i, j, level;
int run, val;
VLC *ac_vlc;
int16_t *quant_matrix;
/* DC coef */
val = mjpeg_decode_dc(s, dc_index);
if (val == 0xffff) {
dprintf("error dc\n");
return -1;
}
quant_matrix = s->quant_matrixes[quant_index];
val = val * quant_matrix[0] + s->last_dc[component];
s->last_dc[component] = val;
block[0] = val;
/* AC coefs */
ac_vlc = &s->vlcs[1][ac_index];
i = 1;
for(;;) {
#if 1
code = get_vlc2(&s->gb, s->vlcs[1][ac_index].table, 9, 2);
#else
code = get_vlc(&s->gb, ac_vlc);
#endif
if (code < 0) {
dprintf("error ac\n");
return -1;
}
/* EOB */
if (code == 0)
break;
if (code == 0xf0) {
i += 16;
} else {
run = code >> 4;
nbits = code & 0xf;
level = get_bits(&s->gb, nbits);
if ((level & (1 << (nbits - 1))) == 0)
level = (-1 << nbits) | (level + 1);
i += run;
if (i >= 64) {
dprintf("error count: %d\n", i);
return -1;
}
j = s->scantable.permutated[i];
block[j] = level * quant_matrix[j];
i++;
if (i >= 64)
break;
}
}
return 0;
}
static int mjpeg_decode_sos(MJpegDecodeContext *s)
{
int len, nb_components, i, j, n, h, v, ret;
int mb_width, mb_height, mb_x, mb_y, vmax, hmax, index, id;
int comp_index[4];
int dc_index[4];
int ac_index[4];
int nb_blocks[4];
int h_count[4];
int v_count[4];
/* XXX: verify len field validity */
len = get_bits(&s->gb, 16);
nb_components = get_bits(&s->gb, 8);
if (len != 6+2*nb_components)
{
dprintf("decode_sos: invalid len (%d)\n", len);
return -1;
}
/* XXX: only interleaved scan accepted */
if (nb_components != 3)
{
dprintf("decode_sos: components(%d) mismatch\n", nb_components);
return -1;
}
vmax = 0;
hmax = 0;
for(i=0;i<nb_components;i++) {
id = get_bits(&s->gb, 8) - 1;
dprintf("component: %d\n", id);
/* find component index */
for(index=0;index<s->nb_components;index++)
if (id == s->component_id[index])
break;
if (index == s->nb_components)
{
dprintf("decode_sos: index(%d) out of components\n", index);
return -1;
}
comp_index[i] = index;
nb_blocks[i] = s->h_count[index] * s->v_count[index];
h_count[i] = s->h_count[index];
v_count[i] = s->v_count[index];
dc_index[i] = get_bits(&s->gb, 4);
ac_index[i] = get_bits(&s->gb, 4);
if (dc_index[i] < 0 || ac_index[i] < 0 ||
dc_index[i] >= 4 || ac_index[i] >= 4)
goto out_of_range;
switch(s->start_code)
{
case SOF0:
if (dc_index[i] > 1 || ac_index[i] > 1)
goto out_of_range;
break;
case SOF1:
case SOF2:
if (dc_index[i] > 3 || ac_index[i] > 3)
goto out_of_range;
break;
case SOF3:
if (dc_index[i] > 3 || ac_index[i] != 0)
goto out_of_range;
break;
}
}
skip_bits(&s->gb, 8); /* Ss */
skip_bits(&s->gb, 8); /* Se */
skip_bits(&s->gb, 8); /* Ah and Al (each are 4 bits) */
for(i=0;i<nb_components;i++)
s->last_dc[i] = 1024;
if (nb_components > 1) {
/* interleaved stream */
mb_width = (s->width + s->h_max * 8 - 1) / (s->h_max * 8);
mb_height = (s->height + s->v_max * 8 - 1) / (s->v_max * 8);
} else {
h = s->h_max / s->h_count[comp_index[0]];
v = s->v_max / s->v_count[comp_index[0]];
mb_width = (s->width + h * 8 - 1) / (h * 8);
mb_height = (s->height + v * 8 - 1) / (v * 8);
nb_blocks[0] = 1;
h_count[0] = 1;
v_count[0] = 1;
}
for(mb_y = 0; mb_y < mb_height; mb_y++) {
for(mb_x = 0; mb_x < mb_width; mb_x++) {
for(i=0;i<nb_components;i++) {
uint8_t *ptr;
int x, y, c;
n = nb_blocks[i];
c = comp_index[i];
h = h_count[i];
v = v_count[i];
x = 0;
y = 0;
if (s->restart_interval && !s->restart_count)
s->restart_count = s->restart_interval;
for(j=0;j<n;j++) {
memset(s->block, 0, sizeof(s->block));
if (decode_block(s, s->block, i,
dc_index[i], ac_index[i],
s->quant_index[c]) < 0) {
dprintf("error y=%d x=%d\n", mb_y, mb_x);
ret = -1;
goto the_end;
}
// dprintf("mb: %d %d processed\n", mb_y, mb_x);
ptr = s->current_picture[c] +
(s->linesize[c] * (v * mb_y + y) * 8) +
(h * mb_x + x) * 8;
if (s->interlaced && s->bottom_field)
ptr += s->linesize[c] >> 1;
s->idct_put(ptr, s->linesize[c], s->block);
if (++x == h) {
x = 0;
y++;
}
}
}
/* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */
if (s->restart_interval && (s->restart_interval < 1350) &&
!--s->restart_count) {
align_get_bits(&s->gb);
skip_bits(&s->gb, 16); /* skip RSTn */
for (j=0; j<nb_components; j++) /* reset dc */
s->last_dc[j] = 1024;
}
}
}
ret = 0;
the_end:
emms_c();
return ret;
out_of_range:
dprintf("decode_sos: ac/dc index out of range\n");
return -1;
}
static int mjpeg_decode_dri(MJpegDecodeContext *s)
{
if (get_bits(&s->gb, 16) != 4)
return -1;
s->restart_interval = get_bits(&s->gb, 16);
dprintf("restart interval: %d\n", s->restart_interval);
return 0;
}
static int mjpeg_decode_app(MJpegDecodeContext *s)
{
int len, id;
/* XXX: verify len field validity */
len = get_bits(&s->gb, 16);
if (len < 5)
return -1;
id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
id = be2me_32(id);
len -= 6;
/* buggy AVID, it puts EOI only at every 10th frame */
/* also this fourcc is used by non-avid files too, it holds some
informations, but it's always present in AVID creates files */
if (id == ff_get_fourcc("AVI1"))
{
/* structure:
4bytes AVI1
1bytes polarity
1bytes always zero
4bytes field_size
4bytes field_size_less_padding
*/
s->buggy_avid = 1;
// if (s->first_picture)
// printf("mjpeg: workarounding buggy AVID\n");
s->interlace_polarity = get_bits(&s->gb, 8);
#if 0
skip_bits(&s->gb, 8);
skip_bits(&s->gb, 32);
skip_bits(&s->gb, 32);
len -= 10;
#endif
// if (s->interlace_polarity)
// printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
goto out;
}
// len -= 2;
if (id == ff_get_fourcc("JFIF"))
{
int t_w, t_h;
skip_bits(&s->gb, 8); /* the trailing zero-byte */
printf("mjpeg: JFIF header found (version: %x.%x)\n",
get_bits(&s->gb, 8), get_bits(&s->gb, 8));
if (get_bits(&s->gb, 8) == 0)
{
int x_density, y_density;
x_density = get_bits(&s->gb, 16);
y_density = get_bits(&s->gb, 16);
dprintf("x/y density: %d (%f), %d (%f)\n", x_density,
(float)x_density, y_density, (float)y_density);
#if 0
//MN: needs to be checked
if(x_density)
// s->avctx->aspect_ratio= s->width*y_density/((float)s->height*x_density);
s->avctx->aspect_ratio = (float)x_density/y_density;
/* it's better, but every JFIF I have seen stores 1:1 */
else
s->avctx->aspect_ratio= 0.0;
#endif
}
else
{
skip_bits(&s->gb, 16);
skip_bits(&s->gb, 16);
}
t_w = get_bits(&s->gb, 8);
t_h = get_bits(&s->gb, 8);
if (t_w && t_h)
{
/* skip thumbnail */
if (len-10-(t_w*t_h*3) > 0)
len -= t_w*t_h*3;
}
len -= 10;
goto out;
}
if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))
{
printf("mjpeg: Adobe header found\n");
skip_bits(&s->gb, 16); /* version */
skip_bits(&s->gb, 16); /* flags0 */
skip_bits(&s->gb, 16); /* flags1 */
skip_bits(&s->gb, 8); /* transform */
len -= 7;
goto out;
}
/* Apple MJPEG-A */
if ((s->start_code == APP1) && (len > (0x28 - 8)))
{
id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
id = be2me_32(id);
len -= 4;
if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */
{
#if 0
skip_bits(&s->gb, 32); /* field size */
skip_bits(&s->gb, 32); /* pad field size */
skip_bits(&s->gb, 32); /* next off */
skip_bits(&s->gb, 32); /* quant off */
skip_bits(&s->gb, 32); /* huff off */
skip_bits(&s->gb, 32); /* image off */
skip_bits(&s->gb, 32); /* scan off */
skip_bits(&s->gb, 32); /* data off */
#endif
if (s->first_picture)
printf("mjpeg: Apple MJPEG-A header found\n");
}
}
out:
/* slow but needed for extreme adobe jpegs */
if (len < 0)
printf("mjpeg: error, decode_app parser read over the end\n");
while(--len > 0)
skip_bits(&s->gb, 8);
return 0;
}
static int mjpeg_decode_com(MJpegDecodeContext *s)
{
/* XXX: verify len field validity */
unsigned int len = get_bits(&s->gb, 16);
if (len >= 2 && len < 32768) {
/* XXX: any better upper bound */
uint8_t *cbuf = av_malloc(len - 1);
if (cbuf) {
int i;
for (i = 0; i < len - 2; i++)
cbuf[i] = get_bits(&s->gb, 8);
if (i > 0 && cbuf[i-1] == '\n')
cbuf[i-1] = 0;
else
cbuf[i] = 0;
printf("mjpeg comment: '%s'\n", cbuf);
/* buggy avid, it puts EOI only at every 10th frame */
if (!strcmp(cbuf, "AVID"))
{
s->buggy_avid = 1;
// if (s->first_picture)
// printf("mjpeg: workarounding buggy AVID\n");
}
av_free(cbuf);
}
}
return 0;
}
#if 0
static int valid_marker_list[] =
{
/* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
/* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 2 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 3 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 4 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 5 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 6 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 7 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* a */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* b */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* c */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/* d */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/* e */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/* f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
}
#endif
/* return the 8 bit start code value and update the search
state. Return -1 if no start code found */
static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)
{
uint8_t *buf_ptr;
unsigned int v, v2;
int val;
#ifdef DEBUG
int skipped=0;
#endif
buf_ptr = *pbuf_ptr;
while (buf_ptr < buf_end) {
v = *buf_ptr++;
v2 = *buf_ptr;
if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe)) {
val = *buf_ptr++;
goto found;
}
#ifdef DEBUG
skipped++;
#endif
}
val = -1;
found:
#ifdef DEBUG
dprintf("find_marker skipped %d bytes\n", skipped);
#endif
*pbuf_ptr = buf_ptr;
return val;
}
static int mjpeg_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
MJpegDecodeContext *s = avctx->priv_data;
uint8_t *buf_end, *buf_ptr;
int i, start_code;
AVPicture *picture = data;
*data_size = 0;
/* no supplementary picture */
if (buf_size == 0)
return 0;
buf_ptr = buf;
buf_end = buf + buf_size;
while (buf_ptr < buf_end) {
/* find start next marker */
start_code = find_marker(&buf_ptr, buf_end);
{
/* EOF */
if (start_code < 0) {
goto the_end;
} else {
dprintf("marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);
if ((buf_end - buf_ptr) > s->buffer_size)
{
av_free(s->buffer);
s->buffer_size = buf_end-buf_ptr;
s->buffer = av_malloc(s->buffer_size);
dprintf("buffer too small, expanding to %d bytes\n",
s->buffer_size);
}
/* unescape buffer of SOS */
if (start_code == SOS)
{
uint8_t *src = buf_ptr;
uint8_t *dst = s->buffer;
while (src<buf_end)
{
uint8_t x = *(src++);
*(dst++) = x;
if (x == 0xff)
{
while(*src == 0xff) src++;
x = *(src++);
if (x >= 0xd0 && x <= 0xd7)
*(dst++) = x;
else if (x)
break;
}
}
init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
dprintf("escaping removed %d bytes\n",
(buf_end - buf_ptr) - (dst - s->buffer));
}
else
init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
s->start_code = start_code;
/* process markers */
if (start_code >= 0xd0 && start_code <= 0xd7) {
dprintf("restart marker: %d\n", start_code&0x0f);
} else if (s->first_picture) {
/* APP fields */
if (start_code >= 0xe0 && start_code <= 0xef)
mjpeg_decode_app(s);
/* Comment */
else if (start_code == COM)
mjpeg_decode_com(s);
}
switch(start_code) {
case SOI:
s->restart_interval = 0;
/* nothing to do on SOI */
break;
case DQT:
mjpeg_decode_dqt(s);
break;
case DHT:
mjpeg_decode_dht(s);
break;
case SOF0:
if (mjpeg_decode_sof0(s) < 0)
return -1;
break;
case EOI:
eoi_parser:
{
if (s->interlaced) {
s->bottom_field ^= 1;
/* if not bottom field, do not output image yet */
if (s->bottom_field)
goto not_the_end;
}
for(i=0;i<3;i++) {
picture->data[i] = s->current_picture[i];
picture->linesize[i] = (s->interlaced) ?
s->linesize[i] >> 1 : s->linesize[i];
}
*data_size = sizeof(AVPicture);
avctx->height = s->height;
if (s->interlaced)
avctx->height *= 2;
avctx->width = s->width;
/* XXX: not complete test ! */
switch((s->h_count[0] << 4) | s->v_count[0]) {
case 0x11:
avctx->pix_fmt = PIX_FMT_YUV444P;
break;
case 0x21:
avctx->pix_fmt = PIX_FMT_YUV422P;
break;
default:
case 0x22:
avctx->pix_fmt = PIX_FMT_YUV420P;
break;
}
/* dummy quality */
/* XXX: infer it with matrix */
// avctx->quality = 3;
goto the_end;
}
break;
case SOS:
mjpeg_decode_sos(s);
/* buggy avid puts EOI every 10-20th frame */
/* if restart period is over process EOI */
if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
goto eoi_parser;
break;
case DRI:
mjpeg_decode_dri(s);
break;
case SOF1:
case SOF2:
case SOF3:
case SOF5:
case SOF6:
case SOF7:
case SOF9:
case SOF10:
case SOF11:
case SOF13:
case SOF14:
case SOF15:
case JPG:
printf("mjpeg: unsupported coding type (%x)\n", start_code);
break;
// default:
// printf("mjpeg: unsupported marker (%x)\n", start_code);
// break;
}
not_the_end:
/* eof process start code */
buf_ptr += (get_bits_count(&s->gb)+7)/8;
dprintf("marker parser used %d bytes (%d bits)\n",
(get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
}
}
}
the_end:
dprintf("mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);
// return buf_end - buf_ptr;
return buf_ptr - buf;
}
static int mjpegb_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
MJpegDecodeContext *s = avctx->priv_data;
uint8_t *buf_end, *buf_ptr;
int i;
AVPicture *picture = data;
GetBitContext hgb; /* for the header */
uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;
uint32_t field_size;
*data_size = 0;
/* no supplementary picture */
if (buf_size == 0)
return 0;
buf_ptr = buf;
buf_end = buf + buf_size;
read_header:
/* reset on every SOI */
s->restart_interval = 0;
init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);
skip_bits(&hgb, 32); /* reserved zeros */
if (get_bits(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))
{
dprintf("not mjpeg-b (bad fourcc)\n");
return 0;
}
field_size = get_bits(&hgb, 32); /* field size */
dprintf("field size: 0x%x\n", field_size);
skip_bits(&hgb, 32); /* padded field size */
second_field_offs = get_bits(&hgb, 32);
dprintf("second field offs: 0x%x\n", second_field_offs);
if (second_field_offs)
s->interlaced = 1;
dqt_offs = get_bits(&hgb, 32);
dprintf("dqt offs: 0x%x\n", dqt_offs);
if (dqt_offs)
{
init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);
s->start_code = DQT;
mjpeg_decode_dqt(s);
}
dht_offs = get_bits(&hgb, 32);
dprintf("dht offs: 0x%x\n", dht_offs);
if (dht_offs)
{
init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);
s->start_code = DHT;
mjpeg_decode_dht(s);
}
sof_offs = get_bits(&hgb, 32);
dprintf("sof offs: 0x%x\n", sof_offs);
if (sof_offs)
{
init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);
s->start_code = SOF0;
if (mjpeg_decode_sof0(s) < 0)
return -1;
}
sos_offs = get_bits(&hgb, 32);
dprintf("sos offs: 0x%x\n", sos_offs);
if (sos_offs)
{
// init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);
init_get_bits(&s->gb, buf+sos_offs, field_size*8);
s->start_code = SOS;
mjpeg_decode_sos(s);
}
skip_bits(&hgb, 32); /* start of data offset */
if (s->interlaced) {
s->bottom_field ^= 1;
/* if not bottom field, do not output image yet */
if (s->bottom_field && second_field_offs)
{
buf_ptr = buf + second_field_offs;
second_field_offs = 0;
goto read_header;
}
}
for(i=0;i<3;i++) {
picture->data[i] = s->current_picture[i];
picture->linesize[i] = (s->interlaced) ?
s->linesize[i] >> 1 : s->linesize[i];
}
*data_size = sizeof(AVPicture);
avctx->height = s->height;
if (s->interlaced)
avctx->height *= 2;
avctx->width = s->width;
/* XXX: not complete test ! */
switch((s->h_count[0] << 4) | s->v_count[0]) {
case 0x11:
avctx->pix_fmt = PIX_FMT_YUV444P;
break;
case 0x21:
avctx->pix_fmt = PIX_FMT_YUV422P;
break;
default:
case 0x22:
avctx->pix_fmt = PIX_FMT_YUV420P;
break;
}
/* dummy quality */
/* XXX: infer it with matrix */
// avctx->quality = 3;
return buf_ptr - buf;
}
static int mjpeg_decode_end(AVCodecContext *avctx)
{
MJpegDecodeContext *s = avctx->priv_data;
int i, j;
av_free(s->buffer);
for(i=0;i<MAX_COMPONENTS;i++)
av_free(s->current_picture[i]);
for(i=0;i<2;i++) {
for(j=0;j<4;j++)
free_vlc(&s->vlcs[i][j]);
}
return 0;
}
AVCodec mjpeg_decoder = {
"mjpeg",
CODEC_TYPE_VIDEO,
CODEC_ID_MJPEG,
sizeof(MJpegDecodeContext),
mjpeg_decode_init,
NULL,
mjpeg_decode_end,
mjpeg_decode_frame,
0,
NULL
};
AVCodec mjpegb_decoder = {
"mjpegb",
CODEC_TYPE_VIDEO,
CODEC_ID_MJPEGB,
sizeof(MJpegDecodeContext),
mjpeg_decode_init,
NULL,
mjpeg_decode_end,
mjpegb_decode_frame,
0,
NULL
};
Reference in New Issue View Git Blame Copy Permalink