libmpcodecs/vd_libmpeg2.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 #include "config.h"
   5
   6 #include "mp_msg.h"
   7
   8 #include "vd_internal.h"
   9
  10 //#undef MPEG12_POSTPROC
  11
  12 static vd_info_t info =
  13 {
  14         "MPEG 1/2 Video decoder libmpeg2-v0.4.0b",
  15         "libmpeg2",
  16         "A'rpi & Fabian Franz",
  17         "Aaron & Walken",
  18         "native"
  19 };
  20
  21 LIBVD_EXTERN(libmpeg2)
  22
  23 //#include "libvo/video_out.h"  // FIXME!!!
  24
  25 #include "libmpeg2/mpeg2.h"
  26 #include "libmpeg2/attributes.h"
  27 #include "libmpeg2/mpeg2_internal.h"
  28
  29 #include "cpudetect.h"
  30
  31 typedef struct {
  32     mpeg2dec_t *mpeg2dec;
  33     int quant_store_idx;
  34     char *quant_store[3];
  35 } vd_libmpeg2_ctx_t;
  36
  37 // to set/get/query special features/parameters
  38 static int control(sh_video_t *sh,int cmd,void* arg,...){
  39     vd_libmpeg2_ctx_t *context = sh->context;
  40     mpeg2dec_t * mpeg2dec = context->mpeg2dec;
  41     const mpeg2_info_t * info = mpeg2_info (mpeg2dec);
  42
  43     switch(cmd) {
  44     case VDCTRL_QUERY_FORMAT:
  45         if (info->sequence->width >> 1 == info->sequence->chroma_width &&
  46             info->sequence->height >> 1 == info->sequence->chroma_height &&
  47             (*((int*)arg)) == IMGFMT_YV12)
  48             return CONTROL_TRUE;
  49         if (info->sequence->width >> 1 == info->sequence->chroma_width &&
  50                 info->sequence->height == info->sequence->chroma_height &&
  51             (*((int*)arg)) == IMGFMT_422P)
  52             return CONTROL_TRUE;
  53         return CONTROL_FALSE;
  54     }
  55
  56     return CONTROL_UNKNOWN;
  57 }
  58
  59 // init driver
  60 static int init(sh_video_t *sh){
  61     vd_libmpeg2_ctx_t *context;
  62     mpeg2dec_t * mpeg2dec;
  63 //    const mpeg2_info_t * info;
  64     int accel;
  65
  66     accel = 0;
  67     if(gCpuCaps.hasMMX)
  68        accel |= MPEG2_ACCEL_X86_MMX;
  69     if(gCpuCaps.hasMMX2)
  70        accel |= MPEG2_ACCEL_X86_MMXEXT;
  71     if(gCpuCaps.has3DNow)
  72        accel |= MPEG2_ACCEL_X86_3DNOW;
  73     if(gCpuCaps.hasAltiVec)
  74        accel |= MPEG2_ACCEL_PPC_ALTIVEC;
  75     #ifdef HAVE_VIS
  76        accel |= MPEG2_ACCEL_SPARC_VIS;
  77     #endif
  78     mpeg2_accel(accel);
  79
  80     mpeg2dec = mpeg2_init ();
  81
  82     if(!mpeg2dec) return 0;
  83
  84     mpeg2_custom_fbuf(mpeg2dec,1); // enable DR1
  85
  86     context = calloc(1, sizeof(vd_libmpeg2_ctx_t));
  87     context->mpeg2dec = mpeg2dec;
  88     sh->context = context;
  89
  90     mpeg2dec->pending_buffer = 0;
  91     mpeg2dec->pending_length = 0;
  92
  93     return 1;
  94 }
  95
  96 // uninit driver
  97 static void uninit(sh_video_t *sh){
  98     int i;
  99     vd_libmpeg2_ctx_t *context = sh->context;
 100     mpeg2dec_t * mpeg2dec = context->mpeg2dec;
 101     if (mpeg2dec->pending_buffer) free(mpeg2dec->pending_buffer);
 102     mpeg2dec->decoder.convert=NULL;
 103     mpeg2dec->decoder.convert_id=NULL;
 104     mpeg2_close (mpeg2dec);
 105     for (i=0; i < 3; i++)
 106         free(context->quant_store[i]);
 107     free(sh->context);
 108 }
 109
 110 static void draw_slice (void * _sh, uint8_t * const * src, unsigned int y){
 111     sh_video_t* sh = (sh_video_t*) _sh;
 112     vd_libmpeg2_ctx_t *context = sh->context;
 113     mpeg2dec_t* mpeg2dec = context->mpeg2dec;
 114     const mpeg2_info_t * info = mpeg2_info (mpeg2dec);
 115     int stride[3];
 116
 117 //  printf("draw_slice() y=%d  \n",y);
 118
 119     stride[0]=mpeg2dec->decoder.stride;
 120     stride[1]=stride[2]=mpeg2dec->decoder.uv_stride;
 121
 122     mpcodecs_draw_slice(sh, (uint8_t **)src,
 123                 stride, info->sequence->picture_width,
 124                 (y+16<=info->sequence->picture_height) ? 16 :
 125                     info->sequence->picture_height-y,
 126                 0, y);
 127 }
 128
 129 // decode a frame
 130 static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){
 131     vd_libmpeg2_ctx_t *context = sh->context;
 132     mpeg2dec_t * mpeg2dec = context->mpeg2dec;
 133     const mpeg2_info_t * info = mpeg2_info (mpeg2dec);
 134     int drop_frame, framedrop=flags&3;
 135
 136     // MPlayer registers its own draw_slice callback, prevent libmpeg2 from freeing the context
 137     mpeg2dec->decoder.convert=NULL;
 138     mpeg2dec->decoder.convert_id=NULL;
 139
 140     if(len<=0) return NULL; // skipped null frame
 141
 142     // append extra 'end of frame' code:
 143     ((char*)data+len)[0]=0;
 144     ((char*)data+len)[1]=0;
 145     ((char*)data+len)[2]=1;
 146     ((char*)data+len)[3]=0xff;
 147     len+=4;
 148
 149     if (mpeg2dec->pending_length) {
 150         mpeg2_buffer (mpeg2dec, mpeg2dec->pending_buffer, mpeg2dec->pending_buffer + mpeg2dec->pending_length);
 151     } else {
 152         mpeg2_buffer (mpeg2dec, data, (uint8_t *)data+len);
 153     }
 154
 155     while(1){
 156         int state=mpeg2_parse (mpeg2dec);
 157         int type, use_callback;
 158         mp_image_t* mpi_new;
 159         unsigned long pw, ph;
 160
 161         switch(state){
 162         case STATE_BUFFER:
 163             if (mpeg2dec->pending_length) {
 164                 // just finished the pending data, continue with processing of the passed buffer
 165                 mpeg2dec->pending_length = 0;
 166                 mpeg2_buffer (mpeg2dec, data, (uint8_t *)data+len);
 167             } else {
 168                 // parsing of the passed buffer finished, return.
 169                 return 0;
 170             }
 171             break;
 172         case STATE_SEQUENCE:
 173             pw = info->sequence->display_width * info->sequence->pixel_width;
 174             ph = info->sequence->display_height * info->sequence->pixel_height;
 175             if(ph) sh->aspect = (float) pw / (float) ph;
 176             // video parameters inited/changed, (re)init libvo:
 177             if (info->sequence->width >> 1 == info->sequence->chroma_width &&
 178                 info->sequence->height >> 1 == info->sequence->chroma_height) {
 179                 if(!mpcodecs_config_vo(sh,
 180                                        info->sequence->picture_width,
 181                                        info->sequence->picture_height, IMGFMT_YV12)) return 0;
 182             } else if (info->sequence->width >> 1 == info->sequence->chroma_width &&
 183                 info->sequence->height == info->sequence->chroma_height) {
 184                 if(!mpcodecs_config_vo(sh,
 185                                        info->sequence->picture_width,
 186                                        info->sequence->picture_height, IMGFMT_422P)) return 0;
 187             } else return 0;
 188             break;
 189         case STATE_PICTURE:
 190             type=info->current_picture->flags&PIC_MASK_CODING_TYPE;
 191
 192             drop_frame = framedrop && (mpeg2dec->decoder.coding_type == B_TYPE);
 193             drop_frame |= framedrop>=2; // hard drop
 194             if (drop_frame) {
 195                mpeg2_skip(mpeg2dec, 1);
 196                //printf("Dropping Frame ...\n");
 197                break;
 198             }
 199             mpeg2_skip(mpeg2dec, 0); //mpeg2skip skips frames until set again to 0
 200
 201             use_callback = (!framedrop && vd_use_slices &&
 202                             (info->current_picture->flags&PIC_FLAG_PROGRESSIVE_FRAME)) ?
 203                             MP_IMGFLAG_DRAW_CALLBACK:0;
 204
 205             // get_buffer "callback":
 206             mpi_new=mpcodecs_get_image(sh,MP_IMGTYPE_IPB,
 207                                        (type==PIC_FLAG_CODING_TYPE_B) ?
 208                                         use_callback : (MP_IMGFLAG_PRESERVE|MP_IMGFLAG_READABLE),
 209                                        info->sequence->width,
 210                                        info->sequence->height);
 211
 212             if(!mpi_new) return 0; // VO ERROR!!!!!!!!
 213             mpeg2_set_buf(mpeg2dec, mpi_new->planes, mpi_new);
 214             mpi_new->stride[0] = info->sequence->width;
 215             mpi_new->stride[1] = info->sequence->chroma_width;
 216             mpi_new->stride[2] = info->sequence->chroma_width;
 217             if (info->current_picture->flags&PIC_FLAG_TOP_FIELD_FIRST)
 218                 mpi_new->fields |= MP_IMGFIELD_TOP_FIRST;
 219             else mpi_new->fields &= ~MP_IMGFIELD_TOP_FIRST;
 220             if (info->current_picture->flags&PIC_FLAG_REPEAT_FIRST_FIELD)
 221                 mpi_new->fields |= MP_IMGFIELD_REPEAT_FIRST;
 222             else mpi_new->fields &= ~MP_IMGFIELD_REPEAT_FIRST;
 223             mpi_new->fields |= MP_IMGFIELD_ORDERED;
 224             if (!(info->current_picture->flags&PIC_FLAG_PROGRESSIVE_FRAME))
 225                 mpi_new->fields |= MP_IMGFIELD_INTERLACED;
 226
 227 #ifdef MPEG12_POSTPROC
 228             mpi_new->qstride=info->sequence->width>>4;
 229             {
 230             char **p = &context->quant_store[type==PIC_FLAG_CODING_TYPE_B ?
 231                                         2 : (context->quant_store_idx ^= 1)];
 232             *p = realloc(*p, mpi_new->qstride*(info->sequence->height>>4));
 233             mpi_new->qscale = *p;
 234             }
 235             mpeg2dec->decoder.quant_store=mpi_new->qscale;
 236             mpeg2dec->decoder.quant_stride=mpi_new->qstride;
 237             mpi_new->pict_type=type; // 1->I, 2->P, 3->B
 238             mpi_new->qscale_type= 1;
 239 #endif
 240
 241             if (mpi_new->flags&MP_IMGFLAG_DRAW_CALLBACK
 242                 && !(mpi_new->flags&MP_IMGFLAG_DIRECT)) {
 243                 // nice, filter/vo likes draw_callback :)
 244                 mpeg2dec->decoder.convert=draw_slice;
 245                 mpeg2dec->decoder.convert_id=sh;
 246             } else {
 247                 mpeg2dec->decoder.convert=NULL;
 248                 mpeg2dec->decoder.convert_id=NULL;
 249             }
 250
 251             break;
 252         case STATE_SLICE:
 253         case STATE_END:
 254         case STATE_INVALID_END:
 255             // decoding done:
 256             if(info->display_fbuf) {
 257                 mp_image_t* mpi = info->display_fbuf->id;
 258                 if (mpeg2dec->pending_length == 0) {
 259                     mpeg2dec->pending_length = mpeg2dec->buf_end - mpeg2dec->buf_start;
 260                     mpeg2dec->pending_buffer = realloc(mpeg2dec->pending_buffer, mpeg2dec->pending_length);
 261                     memcpy(mpeg2dec->pending_buffer, mpeg2dec->buf_start, mpeg2dec->pending_length);
 262                 } else {
 263                     // still some data in the pending buffer, shouldn't happen
 264                     mpeg2dec->pending_length = mpeg2dec->buf_end - mpeg2dec->buf_start;
 265                     memmove(mpeg2dec->pending_buffer, mpeg2dec->buf_start, mpeg2dec->pending_length);
 266                     mpeg2dec->pending_buffer = realloc(mpeg2dec->pending_buffer, mpeg2dec->pending_length + len);
 267                     memcpy(mpeg2dec->pending_buffer+mpeg2dec->pending_length, data, len);
 268                     mpeg2dec->pending_length += len;
 269                 }
 270 //              fprintf(stderr, "pending = %d\n", mpeg2dec->pending_length);
 271                 return mpi;
 272             }
 273         }
 274     }
 275 }