/*
* MJPEG encoder and decoder
- * Copyright (c) 2000, 2001 Gerard Lantau.
+ * Copyright (c) 2000, 2001 Fabrice Bellard.
*
- * 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 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 program is distributed in the hope that it will be useful,
+ * 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 General Public License for more details.
+ * 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 General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 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>
*/
-#include <stdlib.h>
-#include <stdio.h>
+//#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 huff_size_dc_luminance[12];
UINT16 huff_code_dc_luminance[12];
UINT16 huff_code_ac_chrominance[256];
} MJpegContext;
-#define SOF0 0xc0
-#define SOI 0xd8
-#define EOI 0xd9
-#define DQT 0xdb
-#define DHT 0xc4
-#define SOS 0xda
+/* 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.
0xf9, 0xfa
};
-
/* isn't this function nicer than the one in the libjpeg ? */
static void build_huffman_codes(UINT8 *huff_size, UINT16 *huff_code,
const UINT8 *bits_table, const UINT8 *val_table)
{
MJpegContext *m;
- m = malloc(sizeof(MJpegContext));
+ 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,
void mjpeg_close(MpegEncContext *s)
{
- free(s->mjpeg_ctx);
+ av_free(s->mjpeg_ctx);
}
static inline void put_marker(PutBitContext *p, int code)
/* 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 = zigzag_direct[i];
+ j = s->intra_scantable.permutated[i];
put_bits(p, 8, s->intra_matrix[j]);
}
-#if 0
+#ifdef TWOMATRIXES
put_bits(p, 4, 0); /* 8 bit precision */
put_bits(p, 4, 1); /* table 1 */
for(i=0;i<64;i++) {
- j = zigzag_direct[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 = p->buf_ptr;
+ 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);
ptr[1] = size;
}
+static void jpeg_put_comments(MpegEncContext *s)
+{
+ PutBitContext *p = &s->pb;
+ int size;
+ UINT8 *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(!ff_bit_exact){
+ put_marker(p, COM);
+ flush_put_bits(p);
+ ptr = pbBufPtr(p);
+ put_bits(p, 16, 0); /* patched later */
+#define MJPEG_VERSION "FFmpeg" LIBAVCODEC_VERSION "b" LIBAVCODEC_BUILD_STR
+ put_string(p, MJPEG_VERSION);
+ size = strlen(MJPEG_VERSION)+3;
+#undef MJPEG_VERSION
+ ptr[0] = size >> 8;
+ ptr[1] = size;
+ }
+}
+
void mjpeg_picture_header(MpegEncContext *s)
{
put_marker(&s->pb, SOI);
- jpeg_table_header(s);
+ if (!s->mjpeg_data_only_frames)
+ {
+ jpeg_put_comments(s);
+
+ if (s->mjpeg_write_tables) jpeg_table_header(s);
put_marker(&s->pb, SOF0);
/* Y component */
put_bits(&s->pb, 8, 1); /* component number */
- put_bits(&s->pb, 4, 2); /* H factor */
- put_bits(&s->pb, 4, 2); /* V factor */
+ 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, 1); /* H factor */
- put_bits(&s->pb, 4, 1); /* V factor */
+ 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, 1); /* H factor */
- put_bits(&s->pb, 4, 1); /* V factor */
+ 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, 8, 0); /* Ss (not used) */
put_bits(&s->pb, 8, 63); /* Se (not used) */
- put_bits(&s->pb, 8, 0); /* (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)
{
- jflush_put_bits(&s->pb);
+ 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 encode_dc(MpegEncContext *s, int val,
- UINT8 *huff_size, UINT16 *huff_code)
+static inline void mjpeg_encode_dc(MpegEncContext *s, int val,
+ UINT8 *huff_size, UINT16 *huff_code)
{
int mant, nbits;
if (val == 0) {
- jput_bits(&s->pb, huff_size[0], huff_code[0]);
+ put_bits(&s->pb, huff_size[0], huff_code[0]);
} else {
mant = val;
if (val < 0) {
nbits++;
}
- jput_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
+ put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
- jput_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
+ put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
}
}
dc = block[0]; /* overflow is impossible */
val = dc - s->last_dc[component];
if (n < 4) {
- encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
+ 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 {
- encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
+ 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;
}
run = 0;
last_index = s->block_last_index[n];
for(i=1;i<=last_index;i++) {
- j = zigzag_direct[i];
+ j = s->intra_scantable.permutated[i];
val = block[j];
if (val == 0) {
run++;
} else {
while (run >= 16) {
- jput_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
+ put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
run -= 16;
}
mant = val;
}
code = (run << 4) | nbits;
- jput_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
+ put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
- jput_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
+ 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)
- jput_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
+ put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
}
void mjpeg_encode_mb(MpegEncContext *s,
/******************************************/
/* decoding */
-//#define DEBUG
-
-#ifdef DEBUG
-#define dprintf(fmt,args...) printf(fmt, ## args)
-#else
-#define dprintf(fmt,args...)
-#endif
-
-/* compressed picture size */
-#define PICTURE_BUFFER_SIZE 100000
-
#define MAX_COMPONENTS 4
typedef struct MJpegDecodeContext {
+ AVCodecContext *avctx;
GetBitContext gb;
- UINT32 header_state;
+ int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
+
int start_code; /* current start code */
- UINT8 *buf_ptr;
int buffer_size;
- int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
+ UINT8 *buffer;
+
INT16 quant_matrixes[4][64];
VLC vlcs[2][4];
UINT8 *current_picture[MAX_COMPONENTS]; /* picture structure */
int linesize[MAX_COMPONENTS];
DCTELEM block[64] __align8;
- UINT8 buffer[PICTURE_BUFFER_SIZE];
+ ScanTable scantable;
+ void (*idct_put)(UINT8 *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 *bits_table, const UINT8 *val_table,
int nb_codes)
{
static int mjpeg_decode_init(AVCodecContext *avctx)
{
MJpegDecodeContext *s = avctx->priv_data;
+ MpegEncContext s2;
+
+ s->avctx = avctx;
+
+ /* ugly way to get the idct & scantable */
+ 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.idct_put;
+ MPV_common_end(&s2);
- s->header_state = 0;
s->mpeg_enc_ctx_allocated = 0;
- s->buffer_size = PICTURE_BUFFER_SIZE - 1; /* minus 1 to take into
- account FF 00 case */
+ s->buffer_size = 102400; /* smaller buffer should be enough,
+ but photojpg files could ahive bigger sizes */
+ s->buffer = av_malloc(s->buffer_size);
s->start_code = -1;
- s->buf_ptr = s->buffer;
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);
+ mjpeg_decode_dht(s);
+ /* should check for error - but dunno */
+ }
+
return 0;
}
/* quantize tables */
-static int mjpeg_decode_dqt(MJpegDecodeContext *s,
- UINT8 *buf, int buf_size)
+static int mjpeg_decode_dqt(MJpegDecodeContext *s)
{
int len, index, i, j;
- init_get_bits(&s->gb, buf, buf_size);
-
- len = get_bits(&s->gb, 16);
- len -= 2;
+
+ 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 = zigzag_direct[i];
- s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
+ 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,
- UINT8 *buf, int buf_size)
+static int mjpeg_decode_dht(MJpegDecodeContext *s)
{
int len, index, i, class, n, v, code_max;
UINT8 bits_table[17];
UINT8 val_table[256];
- init_get_bits(&s->gb, buf, buf_size);
-
- len = get_bits(&s->gb, 16);
- len -= 2;
+ len = get_bits(&s->gb, 16) - 2;
while (len > 0) {
if (len < 17)
return 0;
}
-static int mjpeg_decode_sof0(MJpegDecodeContext *s,
- UINT8 *buf, int buf_size)
+static int mjpeg_decode_sof0(MJpegDecodeContext *s)
{
int len, nb_components, i, width, height;
- init_get_bits(&s->gb, buf, buf_size);
-
/* XXX: verify len field validity */
len = get_bits(&s->gb, 16);
/* only 8 bits/component accepted */
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 ||
s->quant_index[i] = get_bits(&s->gb, 8);
if (s->quant_index[i] >= 4)
return -1;
- dprintf("component %d %d:%d\n", i, s->h_count[i], s->v_count[i]);
+ 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++) {
- free(s->current_picture[i]);
- s->current_picture[i] = NULL;
- }
+ for(i=0;i<MAX_COMPONENTS;i++)
+ av_freep(&s->current_picture[i]);
s->width = width;
s->height = height;
/* test interlaced mode */
s->org_height != 0 &&
s->height < ((s->org_height * 3) / 4)) {
s->interlaced = 1;
- s->bottom_field = 0;
+// s->bottom_field = (s->interlace_polarity) ? 1 : 0;
+ s->bottom_field = 0;
}
for(i=0;i<nb_components;i++) {
- int w, h, hh, vv;
- hh = s->h_max / s->h_count[i];
- vv = s->v_max / s->v_count[i];
- w = (s->width + 8 * hh - 1) / (8 * hh);
- h = (s->height + 8 * vv - 1) / (8 * vv);
- w = w * 8;
- h = h * 8;
+ 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;
- /* memory test is done in mjpeg_decode_sos() */
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 decode_dc(MJpegDecodeContext *s, int dc_index)
+static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
{
- VLC *dc_vlc;
int code, diff;
-
- dc_vlc = &s->vlcs[0][dc_index];
- code = get_vlc(&s->gb, dc_vlc);
+#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 {
VLC *ac_vlc;
INT16 *quant_matrix;
- quant_matrix = s->quant_matrixes[quant_index];
/* DC coef */
- val = decode_dc(s, dc_index);
+ 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_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;
dprintf("error count: %d\n", i);
return -1;
}
- j = zigzag_direct[i];
+ j = s->scantable.permutated[i];
block[j] = level * quant_matrix[j];
i++;
if (i >= 64)
return 0;
}
-static int mjpeg_decode_sos(MJpegDecodeContext *s,
- UINT8 *buf, int buf_size)
+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 h_count[4];
int v_count[4];
- init_get_bits(&s->gb, buf, buf_size);
/* 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];
v_count[i] = s->v_count[index];
dc_index[i] = get_bits(&s->gb, 4);
- if (dc_index[i] >= 4)
- return -1;
ac_index[i] = get_bits(&s->gb, 4);
- if (ac_index[i] >= 4)
- return -1;
+
+ 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;
+ }
}
- get_bits(&s->gb, 8); /* Ss */
- get_bits(&s->gb, 8); /* Se */
- get_bits(&s->gb, 8); /* not used */
+ 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;
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++) {
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 %d %d\n", mb_y, mb_x);
+ dprintf("error y=%d x=%d\n", mb_y, mb_x);
ret = -1;
goto the_end;
}
- ff_idct (s->block);
+// 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;
- put_pixels_clamped(s->block, ptr, s->linesize[c]);
+ 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 = get_bits(&s->gb, 16);
+ int y_density = get_bits(&s->gb, 16);
+
+ //MN: needs to be checked
+ if(x_density)
+ s->avctx->aspect_ratio= s->width*y_density/((float)s->height*x_density);
+ else
+ s->avctx->aspect_ratio= 0.0;
+ }
+ 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)
+{
+ int len, i;
+ UINT8 *cbuf;
+
+ /* XXX: verify len field validity */
+ len = get_bits(&s->gb, 16)-2;
+ cbuf = av_malloc(len+1);
+
+ for (i = 0; i < len; i++)
+ cbuf[i] = get_bits(&s->gb, 8);
+ if (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 **pbuf_ptr, UINT8 *buf_end,
- UINT32 *header_state)
+static int find_marker(UINT8 **pbuf_ptr, UINT8 *buf_end)
{
UINT8 *buf_ptr;
- unsigned int state, v;
+ unsigned int v, v2;
int val;
+#ifdef DEBUG
+ int skipped=0;
+#endif
- state = *header_state;
buf_ptr = *pbuf_ptr;
- if (state) {
- /* get marker */
- found:
- if (buf_ptr < buf_end) {
- val = *buf_ptr++;
- state = 0;
- } else {
- val = -1;
- }
- } else {
- while (buf_ptr < buf_end) {
- v = *buf_ptr++;
- if (v == 0xff) {
- state = 1;
- goto found;
- }
+ while (buf_ptr < buf_end) {
+ v = *buf_ptr++;
+ v2 = *buf_ptr;
+ if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe)) {
+ val = *buf_ptr++;
+ goto found;
}
- val = -1;
+#ifdef DEBUG
+ skipped++;
+#endif
}
+ val = -1;
+found:
+#ifdef DEBUG
+ dprintf("find_marker skipped %d bytes\n", skipped);
+#endif
*pbuf_ptr = buf_ptr;
- *header_state = state;
return val;
}
UINT8 *buf, int buf_size)
{
MJpegDecodeContext *s = avctx->priv_data;
- UINT8 *buf_end, *buf_ptr, *buf_start;
- int len, code, start_code, input_size, i;
+ UINT8 *buf_end, *buf_ptr;
+ int i, start_code;
AVPicture *picture = data;
+ *data_size = 0;
+
/* no supplementary picture */
- if (buf_size == 0) {
- *data_size = 0;
+ if (buf_size == 0)
return 0;
- }
buf_ptr = buf;
buf_end = buf + buf_size;
while (buf_ptr < buf_end) {
- buf_start = buf_ptr;
/* find start next marker */
- code = find_marker(&buf_ptr, buf_end, &s->header_state);
- /* copy to buffer */
- len = buf_ptr - buf_start;
- if (len + (s->buf_ptr - s->buffer) > s->buffer_size) {
- /* data too big : flush */
- s->buf_ptr = s->buffer;
- if (code > 0)
- s->start_code = code;
- } else {
- memcpy(s->buf_ptr, buf_start, len);
- s->buf_ptr += len;
- /* if we got FF 00, we copy FF to the stream to unescape FF 00 */
- if (code == 0) {
- s->buf_ptr--;
- } else if (code > 0) {
- /* prepare data for next start code */
- input_size = s->buf_ptr - s->buffer;
- start_code = s->start_code;
- s->buf_ptr = s->buffer;
- s->start_code = code;
- dprintf("marker=%x\n", start_code);
+ 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 *src = buf_ptr;
+ UINT8 *dst = s->buffer;
+
+ while (src<buf_end)
+ {
+ UINT8 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);
+
+ 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);
+
+ 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, s->buffer, input_size);
+ mjpeg_decode_dqt(s);
break;
case DHT:
- mjpeg_decode_dht(s, s->buffer, input_size);
+ mjpeg_decode_dht(s);
break;
case SOF0:
- mjpeg_decode_sof0(s, s->buffer, input_size);
+ if (mjpeg_decode_sof0(s) < 0)
+ return -1;
break;
- case SOS:
- mjpeg_decode_sos(s, s->buffer, input_size);
- if (s->start_code == EOI) {
+ case EOI:
+eoi_parser:
+ {
int l;
if (s->interlaced) {
s->bottom_field ^= 1;
/* if not bottom field, do not output image yet */
if (s->bottom_field)
- goto the_end;
+ goto not_the_end;
}
for(i=0;i<3;i++) {
picture->data[i] = s->current_picture[i];
+#if 1
l = s->linesize[i];
if (s->interlaced)
l >>= 1;
picture->linesize[i] = l;
+#else
+ picture->linesize[i] = (s->interlaced) ?
+ s->linesize[i] >> 1 : s->linesize[i];
+#endif
}
*data_size = sizeof(AVPicture);
avctx->height = s->height;
}
/* dummy quality */
/* XXX: infer it with matrix */
- avctx->quality = 3;
+// 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:
+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 *buf, int buf_size)
+{
+ MJpegDecodeContext *s = avctx->priv_data;
+ UINT8 *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);
+
+ 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));
+ 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));
+ 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));
+ 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));
+ init_get_bits(&s->gb, buf+sos_offs, field_size);
+ 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++)
- free(s->current_picture[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]);
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
};
projects / ffmpeg / blobdiff