libmpcodecs/vd_libmpeg2.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 #include "config.h"
   5 #ifdef USE_LIBMPEG2
   6
   7 #include "mp_msg.h"
   8
   9 #include "vd_internal.h"
  10
  11 //#undef MPEG12_POSTPROC
  12
  13 static vd_info_t info =
  14 {
  15         "MPEG 1/2 Video decoder libmpeg2-v0.4.0b",
  16         "libmpeg2",
  17         "A'rpi & Fabian Franz",
  18         "Aaron & Walken",
  19         "native"
  20 };
  21
  22 LIBVD_EXTERN(libmpeg2)
  23
  24 //#include "libvo/video_out.h"  // FIXME!!!
  25
  26 #include "libmpeg2/mpeg2.h"
  27 #include "libmpeg2/attributes.h"
  28 #include "libmpeg2/mpeg2_internal.h"
  29
  30 #include "cpudetect.h"
  31
  32 typedef struct {
  33     mpeg2dec_t *mpeg2dec;
  34     int quant_store_idx;
  35     char *quant_store[3];
  36 } vd_libmpeg2_ctx_t;
  37
  38 // to set/get/query special features/parameters
  39 static int control(sh_video_t *sh,int cmd,void* arg,...){
  40     vd_libmpeg2_ctx_t *context = sh->context;
  41     mpeg2dec_t * mpeg2dec = context->mpeg2dec;
  42     const mpeg2_info_t * info = mpeg2_info (mpeg2dec);
  43
  44     switch(cmd) {
  45     case VDCTRL_QUERY_FORMAT:
  46         if (info->sequence->width >> 1 == info->sequence->chroma_width &&
  47             info->sequence->height >> 1 == info->sequence->chroma_height &&
  48             (*((int*)arg)) == IMGFMT_YV12)
  49             return CONTROL_TRUE;
  50         if (info->sequence->width >> 1 == info->sequence->chroma_width &&
  51                 info->sequence->height == info->sequence->chroma_height &&
  52             (*((int*)arg)) == IMGFMT_422P)
  53             return CONTROL_TRUE;
  54         return CONTROL_FALSE;
  55     }
  56
  57     return CONTROL_UNKNOWN;
  58 }
  59
  60 // init driver
  61 static int init(sh_video_t *sh){
  62     vd_libmpeg2_ctx_t *context;
  63     mpeg2dec_t * mpeg2dec;
  64 //    const mpeg2_info_t * info;
  65     int accel;
  66
  67     accel = 0;
  68     if(gCpuCaps.hasMMX)
  69        accel |= MPEG2_ACCEL_X86_MMX;
  70     if(gCpuCaps.hasMMX2)
  71        accel |= MPEG2_ACCEL_X86_MMXEXT;
  72     if(gCpuCaps.has3DNow)
  73        accel |= MPEG2_ACCEL_X86_3DNOW;
  74     if(gCpuCaps.hasAltiVec)
  75        accel |= MPEG2_ACCEL_PPC_ALTIVEC;
  76     #ifdef HAVE_VIS
  77        accel |= MPEG2_ACCEL_SPARC_VIS;
  78     #endif
  79     mpeg2_accel(accel);
  80
  81     mpeg2dec = mpeg2_init ();
  82
  83     if(!mpeg2dec) return 0;
  84
  85     mpeg2_custom_fbuf(mpeg2dec,1); // enable DR1
  86
  87     context = calloc(1, sizeof(vd_libmpeg2_ctx_t));
  88     context->mpeg2dec = mpeg2dec;
  89     sh->context = context;
  90
  91     mpeg2dec->pending_buffer = 0;
  92     mpeg2dec->pending_length = 0;
  93
  94     return 1;
  95 }
  96
  97 // uninit driver
  98 static void uninit(sh_video_t *sh){
  99     int i;
 100     vd_libmpeg2_ctx_t *context = sh->context;
 101     mpeg2dec_t * mpeg2dec = context->mpeg2dec;
 102     if (mpeg2dec->pending_buffer) free(mpeg2dec->pending_buffer);
 103     mpeg2dec->decoder.convert=NULL;
 104     mpeg2dec->decoder.convert_id=NULL;
 105     mpeg2_close (mpeg2dec);
 106     for (i=0; i < 3; i++)
 107         free(context->quant_store[i]);
 108     free(sh->context);
 109 }
 110
 111 static void draw_slice (void * _sh, uint8_t * const * src, unsigned int y){
 112     sh_video_t* sh = (sh_video_t*) _sh;
 113     vd_libmpeg2_ctx_t *context = sh->context;
 114     mpeg2dec_t* mpeg2dec = context->mpeg2dec;
 115     const mpeg2_info_t * info = mpeg2_info (mpeg2dec);
 116     int stride[3];
 117
 118 //  printf("draw_slice() y=%d  \n",y);
 119
 120     stride[0]=mpeg2dec->decoder.stride;
 121     stride[1]=stride[2]=mpeg2dec->decoder.uv_stride;
 122
 123     mpcodecs_draw_slice(sh, (uint8_t **)src,
 124                 stride, info->sequence->picture_width,
 125                 (y+16<=info->sequence->picture_height) ? 16 :
 126                     info->sequence->picture_height-y,
 127                 0, y);
 128 }
 129
 130 // decode a frame
 131 static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){
 132     vd_libmpeg2_ctx_t *context = sh->context;
 133     mpeg2dec_t * mpeg2dec = context->mpeg2dec;
 134     const mpeg2_info_t * info = mpeg2_info (mpeg2dec);
 135     int drop_frame, framedrop=flags&3;
 136
 137     // MPlayer registers its own draw_slice callback, prevent libmpeg2 from freeing the context
 138     mpeg2dec->decoder.convert=NULL;
 139     mpeg2dec->decoder.convert_id=NULL;
 140
 141     if(len<=0) return NULL; // skipped null frame
 142
 143     // append extra 'end of frame' code:
 144     ((char*)data+len)[0]=0;
 145     ((char*)data+len)[1]=0;
 146     ((char*)data+len)[2]=1;
 147     ((char*)data+len)[3]=0xff;
 148     len+=4;
 149
 150     if (mpeg2dec->pending_length) {
 151         mpeg2_buffer (mpeg2dec, mpeg2dec->pending_buffer, mpeg2dec->pending_buffer + mpeg2dec->pending_length);
 152     } else {
 153         mpeg2_buffer (mpeg2dec, data, data+len);
 154     }
 155
 156     while(1){
 157         int state=mpeg2_parse (mpeg2dec);
 158         int type, use_callback;
 159         mp_image_t* mpi_new;
 160         unsigned long pw, ph;
 161
 162         switch(state){
 163         case STATE_BUFFER:
 164             if (mpeg2dec->pending_length) {
 165                 // just finished the pending data, continue with processing of the passed buffer
 166                 mpeg2dec->pending_length = 0;
 167                 mpeg2_buffer (mpeg2dec, data, data+len);
 168             } else {
 169                 // parsing of the passed buffer finished, return.
 170                 return 0;
 171             }
 172             break;
 173         case STATE_SEQUENCE:
 174             pw = info->sequence->display_width * info->sequence->pixel_width;
 175             ph = info->sequence->display_height * info->sequence->pixel_height;
 176             if(ph) sh->aspect = (float) pw / (float) ph;
 177             // video parameters inited/changed, (re)init libvo:
 178             if (info->sequence->width >> 1 == info->sequence->chroma_width &&
 179                 info->sequence->height >> 1 == info->sequence->chroma_height) {
 180                 if(!mpcodecs_config_vo(sh,
 181                                        info->sequence->picture_width,
 182                                        info->sequence->picture_height, IMGFMT_YV12)) return 0;
 183             } else if (info->sequence->width >> 1 == info->sequence->chroma_width &&
 184                 info->sequence->height == info->sequence->chroma_height) {
 185                 if(!mpcodecs_config_vo(sh,
 186                                        info->sequence->picture_width,
 187                                        info->sequence->picture_height, IMGFMT_422P)) return 0;
 188             } else return 0;
 189             break;
 190         case STATE_PICTURE:
 191             type=info->current_picture->flags&PIC_MASK_CODING_TYPE;
 192
 193             drop_frame = framedrop && (mpeg2dec->decoder.coding_type == B_TYPE);
 194             drop_frame |= framedrop>=2; // hard drop
 195             if (drop_frame) {
 196                mpeg2_skip(mpeg2dec, 1);
 197                //printf("Dropping Frame ...\n");
 198                break;
 199             }
 200             mpeg2_skip(mpeg2dec, 0); //mpeg2skip skips frames until set again to 0
 201
 202             use_callback = (!framedrop && vd_use_slices &&
 203                             (info->current_picture->flags&PIC_FLAG_PROGRESSIVE_FRAME)) ?
 204                             MP_IMGFLAG_DRAW_CALLBACK:0;
 205
 206             // get_buffer "callback":
 207             mpi_new=mpcodecs_get_image(sh,MP_IMGTYPE_IPB,
 208                                        (type==PIC_FLAG_CODING_TYPE_B) ?
 209                                         use_callback : (MP_IMGFLAG_PRESERVE|MP_IMGFLAG_READABLE),
 210                                        info->sequence->width,
 211                                        info->sequence->height);
 212
 213             if(!mpi_new) return 0; // VO ERROR!!!!!!!!
 214             mpeg2_set_buf(mpeg2dec, mpi_new->planes, mpi_new);
 215             if (info->current_picture->flags&PIC_FLAG_TOP_FIELD_FIRST)
 216                 mpi_new->fields |= MP_IMGFIELD_TOP_FIRST;
 217             else mpi_new->fields &= ~MP_IMGFIELD_TOP_FIRST;
 218             if (info->current_picture->flags&PIC_FLAG_REPEAT_FIRST_FIELD)
 219                 mpi_new->fields |= MP_IMGFIELD_REPEAT_FIRST;
 220             else mpi_new->fields &= ~MP_IMGFIELD_REPEAT_FIRST;
 221             mpi_new->fields |= MP_IMGFIELD_ORDERED;
 222
 223 #ifdef MPEG12_POSTPROC
 224             mpi_new->qstride=info->sequence->width>>4;
 225             {
 226             char **p = &context->quant_store[type==PIC_FLAG_CODING_TYPE_B ?
 227                                         2 : (context->quant_store_idx ^= 1)];
 228             *p = realloc(*p, mpi_new->qstride*(info->sequence->height>>4));
 229             mpi_new->qscale = *p;
 230             }
 231             mpeg2dec->decoder.quant_store=mpi_new->qscale;
 232             mpeg2dec->decoder.quant_stride=mpi_new->qstride;
 233             mpi_new->pict_type=type; // 1->I, 2->P, 3->B
 234             mpi_new->qscale_type= 1;
 235 #endif
 236
 237             if (mpi_new->flags&MP_IMGFLAG_DRAW_CALLBACK
 238                 && !(mpi_new->flags&MP_IMGFLAG_DIRECT)) {
 239                 // nice, filter/vo likes draw_callback :)
 240                 mpeg2dec->decoder.convert=draw_slice;
 241                 mpeg2dec->decoder.convert_id=sh;
 242             } else {
 243                 mpeg2dec->decoder.convert=NULL;
 244                 mpeg2dec->decoder.convert_id=NULL;
 245             }
 246
 247             break;
 248         case STATE_SLICE:
 249         case STATE_END:
 250         case STATE_INVALID_END:
 251             // decoding done:
 252             if(info->display_fbuf) {
 253                 mp_image_t* mpi = info->display_fbuf->id;
 254                 if (mpeg2dec->pending_length == 0) {
 255                     mpeg2dec->pending_length = mpeg2dec->buf_end - mpeg2dec->buf_start;
 256                     mpeg2dec->pending_buffer = realloc(mpeg2dec->pending_buffer, mpeg2dec->pending_length);
 257                     memcpy(mpeg2dec->pending_buffer, mpeg2dec->buf_start, mpeg2dec->pending_length);
 258                 } else {
 259                     // still some data in the pending buffer, shouldn't happen
 260                     mpeg2dec->pending_length = mpeg2dec->buf_end - mpeg2dec->buf_start;
 261                     memmove(mpeg2dec->pending_buffer, mpeg2dec->buf_start, mpeg2dec->pending_length);
 262                     mpeg2dec->pending_buffer = realloc(mpeg2dec->pending_buffer, mpeg2dec->pending_length + len);
 263                     memcpy(mpeg2dec->pending_buffer+mpeg2dec->pending_length, data, len);
 264                     mpeg2dec->pending_length += len;
 265                 }
 266 //              fprintf(stderr, "pending = %d\n", mpeg2dec->pending_length);
 267                 return mpi;
 268             }
 269         }
 270     }
 271 }
 272 #endif