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PSX MDEC decoder, based upon some code from Sebastian Jedruszkiewicz <elf at frogger dot rules dot pl> 

note: completly untested, no demuxer yet

Originally committed as revision 2134 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-08-22 14:59:04 +00:00
parent a6aec9c94f
commit c3bf0288c9
5 changed files with 315 additions and 14 deletions
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1
libavcodec/allcodecs.c
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@ -116,6 +116,7 @@ void avcodec_register_all(void)
register_avcodec(&vcr1_decoder);
register_avcodec(&cljr_decoder);
register_avcodec(&fourxm_decoder);
register_avcodec(&mdec_decoder);
#ifdef CONFIG_AC3
register_avcodec(&ac3_decoder);
#endif

7
libavcodec/avcodec.h
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@ -15,8 +15,8 @@ extern "C" {
#define LIBAVCODEC_VERSION_INT 0x000406
#define LIBAVCODEC_VERSION "0.4.6"
#define LIBAVCODEC_BUILD 4673
#define LIBAVCODEC_BUILD_STR "4673"
#define LIBAVCODEC_BUILD 4674
#define LIBAVCODEC_BUILD_STR "4674"
#define LIBAVCODEC_IDENT "FFmpeg" LIBAVCODEC_VERSION "b" LIBAVCODEC_BUILD_STR
@ -63,6 +63,7 @@ enum CodecID {
CODEC_ID_4XM,
CODEC_ID_VCR1,
CODEC_ID_CLJR,
CODEC_ID_MDEC,
/* various pcm "codecs" */
CODEC_ID_PCM_S16LE,
@ -1283,6 +1284,7 @@ extern AVCodec h264_encoder;
extern AVCodec asv1_encoder;
extern AVCodec vcr1_encoder;
extern AVCodec ffv1_encoder;
extern AVCodec mdec_encoder;
extern AVCodec h263_decoder;
extern AVCodec mpeg4_decoder;
@ -1323,6 +1325,7 @@ extern AVCodec vcr1_decoder;
extern AVCodec cljr_decoder;
extern AVCodec ffv1_decoder;
extern AVCodec fourxm_decoder;
extern AVCodec mdec_decoder;
extern AVCodec ra_144_decoder;
extern AVCodec ra_288_decoder;

292
libavcodec/mdec.c Normal file
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@ -0,0 +1,292 @@
/*
* PSX MDEC codec
* Copyright (c) 2003 Michael Niedermayer
*
* 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
*
* based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
*/
/**
* @file mdec.c
* PSX MDEC codec.
* This is very similar to intra only MPEG1.
*/
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
//#undef NDEBUG
//#include <assert.h>
typedef struct MDECContext{
AVCodecContext *avctx;
DSPContext dsp;
AVFrame picture;
PutBitContext pb;
GetBitContext gb;
ScanTable scantable;
int version;
int qscale;
int last_dc[3];
int mb_width;
int mb_height;
int mb_x, mb_y;
DCTELEM __align8 block[6][64];
uint16_t __align8 intra_matrix[64];
int __align8 q_intra_matrix[64];
uint8_t *bitstream_buffer;
int bitstream_buffer_size;
int block_last_index[6];
} MDECContext;
//very similar to mpeg1
static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n)
{
int level, diff, i, j, run;
int component;
RLTable *rl = &rl_mpeg1;
uint8_t * const scantable= a->scantable.permutated;
const uint16_t *quant_matrix= ff_mpeg1_default_intra_matrix;
const int qscale= a->qscale;
/* DC coef */
if(a->version==2){
block[0]= get_sbits(&a->gb, 11);
}else{
component = (n <= 3 ? 0 : n - 4 + 1);
diff = decode_dc(&a->gb, component);
if (diff >= 0xffff)
return -1;
a->last_dc[component]+= diff;
block[0] = a->last_dc[component]<<3;
}
i = 0;
{
OPEN_READER(re, &a->gb);
/* now quantify & encode AC coefs */
for(;;) {
UPDATE_CACHE(re, &a->gb);
GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
if(level == 127){
break;
} else if(level != 0) {
i += run;
j = scantable[i];
level= (level*qscale*quant_matrix[j])>>3;
level= (level-1)|1;
level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
LAST_SKIP_BITS(re, &a->gb, 1);
} else {
/* escape */
run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
UPDATE_CACHE(re, &a->gb);
level = SHOW_SBITS(re, &a->gb, 8); SKIP_BITS(re, &a->gb, 8);
if (level == -128) {
level = SHOW_UBITS(re, &a->gb, 8) - 256; LAST_SKIP_BITS(re, &a->gb, 8);
} else if (level == 0) {
level = SHOW_UBITS(re, &a->gb, 8) ; LAST_SKIP_BITS(re, &a->gb, 8);
}
i += run;
j = scantable[i];
/* if(level<0){
level= -level;
level= (level*qscale*quant_matrix[j])>>4;
level= (level-1)|1;
level= -level;
}else{*/
level= (level*qscale*quant_matrix[j])>>4;
/* level= (level-1)|1;
}*/
}
if (i > 63){
fprintf(stderr, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
return -1;
}
block[j] = level;
}
CLOSE_READER(re, &a->gb);
}
a->block_last_index[n] = i;
return 0;
}
static inline int decode_mb(MDECContext *a, DCTELEM block[6][64]){
int i;
a->dsp.clear_blocks(block[0]);
for(i=5; i>=0; i--){
if( mdec_decode_block_intra(a, block[i], i) < 0)
return -1;
}
return 0;
}
static inline void idct_put(MDECContext *a, int mb_x, int mb_y){
DCTELEM (*block)[64]= a->block;
int linesize= a->picture.linesize[0];
uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
a->dsp.idct_put(dest_y , linesize, block[0]);
a->dsp.idct_put(dest_y + 8, linesize, block[1]);
a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
}
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
MDECContext * const a = avctx->priv_data;
AVFrame *picture = data;
AVFrame * const p= (AVFrame*)&a->picture;
int i;
*data_size = 0;
/* special case for last picture */
if (buf_size == 0) {
return 0;
}
if(p->data[0])
avctx->release_buffer(avctx, p);
p->reference= 0;
if(avctx->get_buffer(avctx, p) < 0){
fprintf(stderr, "get_buffer() failed\n");
return -1;
}
p->pict_type= I_TYPE;
p->key_frame= 1;
a->last_dc[0]=
a->last_dc[1]=
a->last_dc[2]= 0;
a->bitstream_buffer= av_fast_realloc(a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
for(i=0; 2*i<buf_size; i+=2){
((uint16_t*)a->bitstream_buffer)[i] = ((uint16_t*)buf)[i+1];
((uint16_t*)a->bitstream_buffer)[i+1]= ((uint16_t*)buf)[i ];
}
// a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (uint32_t*)buf, buf_size/4);
init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
a->qscale= get_bits(&a->gb, 16);
a->version= get_bits(&a->gb, 16);
skip_bits(&a->gb, 8*8);
printf("qscale:%d, version:%d\n", a->qscale, a->version);
for(a->mb_y=0; a->mb_y<a->mb_height; a->mb_y++){
for(a->mb_x=0; a->mb_x<a->mb_width; a->mb_x++){
if( decode_mb(a, a->block) <0)
return -1;
idct_put(a, a->mb_x, a->mb_y);
}
}
#if 0
int i;
printf("%d %d\n", 8*buf_size, get_bits_count(&a->gb));
for(i=get_bits_count(&a->gb); i<8*buf_size; i++){
printf("%d", get_bits1(&a->gb));
}
for(i=0; i<s->avctx->extradata_size; i++){
printf("%c\n", ((uint8_t*)s->avctx->extradata)[i]);
}
#endif
// p->quality= (32 + a->inv_qscale/2)/a->inv_qscale;
// memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
*picture= *(AVFrame*)&a->picture;
*data_size = sizeof(AVPicture);
emms_c();
return (get_bits_count(&a->gb)+31)/32*4;
}
static void mdec_common_init(AVCodecContext *avctx){
MDECContext * const a = avctx->priv_data;
dsputil_init(&a->dsp, avctx);
a->mb_width = (avctx->width + 15) / 16;
a->mb_height = (avctx->height + 15) / 16;
avctx->coded_frame= (AVFrame*)&a->picture;
a->avctx= avctx;
}
static int decode_init(AVCodecContext *avctx){
MDECContext * const a = avctx->priv_data;
AVFrame *p= (AVFrame*)&a->picture;
int i;
mdec_common_init(avctx);
init_vlcs();
ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct);
/*
for(i=0; i<64; i++){
int index= ff_zigzag_direct[i];
a->intra_matrix[i]= 64*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
}
*/
p->qstride= a->mb_width;
p->qscale_table= av_mallocz( p->qstride * a->mb_height);
return 0;
}
static int decode_end(AVCodecContext *avctx){
MDECContext * const a = avctx->priv_data;
av_freep(&a->bitstream_buffer);
av_freep(&a->picture.qscale_table);
a->bitstream_buffer_size=0;
avcodec_default_free_buffers(avctx);
return 0;
}
AVCodec mdec_decoder = {
"mdec",
CODEC_TYPE_VIDEO,
CODEC_ID_MDEC,
sizeof(MDECContext),
decode_init,
NULL,
decode_end,
decode_frame,
CODEC_CAP_DR1,
};

23
libavcodec/mpeg12.c
View File

@ -819,7 +819,7 @@ static VLC mb_ptype_vlc;
static VLC mb_btype_vlc;
static VLC mb_pat_vlc;
static void init_vlcs(MpegEncContext *s)
static void init_vlcs()
{
static int done = 0;
@ -1227,23 +1227,23 @@ static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
return val;
}
static inline int decode_dc(MpegEncContext *s, int component)
static inline int decode_dc(GetBitContext *gb, int component)
{
int code, diff;
if (component == 0) {
code = get_vlc2(&s->gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
} else {
code = get_vlc2(&s->gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
}
if (code < 0){
fprintf(stderr, "invalid dc code at %d %d\n", s->mb_x, s->mb_y);
fprintf(stderr, "invalid dc code at\n");
return 0xffff;
}
if (code == 0) {
diff = 0;
} else {
diff = get_xbits(&s->gb, code);
diff = get_xbits(gb, code);
}
return diff;
}
@ -1261,7 +1261,7 @@ static inline int mpeg1_decode_block_intra(MpegEncContext *s,
/* DC coef */
component = (n <= 3 ? 0 : n - 4 + 1);
diff = decode_dc(s, component);
diff = decode_dc(&s->gb, component);
if (diff >= 0xffff)
return -1;
dc = s->last_dc[component];
@ -1498,7 +1498,7 @@ static inline int mpeg2_decode_block_intra(MpegEncContext *s,
quant_matrix = s->chroma_intra_matrix;
component = n - 3;
}
diff = decode_dc(s, component);
diff = decode_dc(&s->gb, component);
if (diff >= 0xffff)
return -1;
dc = s->last_dc[component];
@ -1570,7 +1570,7 @@ static int mpeg_decode_init(AVCodecContext *avctx)
s->mpeg_enc_ctx.flags= avctx->flags;
common_init(&s->mpeg_enc_ctx);
init_vlcs(&s->mpeg_enc_ctx);
init_vlcs();
s->mpeg_enc_ctx_allocated = 0;
s->mpeg_enc_ctx.picture_number = 0;
@ -2477,3 +2477,8 @@ AVCodec mpeg_xvmc_decoder = {
};
#endif
/* this is ugly i know, but the alternative is too make
hundreds of vars global and prefix them with ff_mpeg1_
which is far uglier. */
#include "mdec.c"

6
libavcodec/mpegvideo.h
View File

@ -648,7 +648,7 @@ typedef struct MpegEncContext {
int full_pel[2];
int interlaced_dct;
int first_slice;
int first_field;
int first_field; ///< is 1 for the first field of a field picture 0 otherwise
/* RTP specific */
/* These are explained on avcodec.h */
@ -662,8 +662,8 @@ typedef struct MpegEncContext {
int (*decode_mb)(struct MpegEncContext *s, DCTELEM block[6][64]); // used by some codecs to avoid a switch()
#define SLICE_OK 0
#define SLICE_ERROR -1
#define SLICE_END -2 //end marker found
#define SLICE_NOEND -3 //no end marker or error found but mb count exceeded
#define SLICE_END -2 ///<end marker found
#define SLICE_NOEND -3 ///<no end marker or error found but mb count exceeded
void (*dct_unquantize_mpeg1)(struct MpegEncContext *s,
DCTELEM *block/*align 16*/, int n, int qscale);