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         "libmpeg2 MPEG 1/2 Video decoder",
  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     int imgfmt;
  36     int width;
  37     int height;
  38     double aspect;
  39 } vd_libmpeg2_ctx_t;
  40
  41 // to set/get/query special features/parameters
  42 static int control(sh_video_t *sh,int cmd,void* arg,...){
  43     vd_libmpeg2_ctx_t *context = sh->context;
  44     mpeg2dec_t * mpeg2dec = context->mpeg2dec;
  45     const mpeg2_info_t * info = mpeg2_info (mpeg2dec);
  46
  47     switch(cmd) {
  48     case VDCTRL_QUERY_FORMAT:
  49         if (info->sequence->width >> 1 == info->sequence->chroma_width &&
  50             info->sequence->height >> 1 == info->sequence->chroma_height &&
  51             (*((int*)arg)) == IMGFMT_YV12)
  52             return CONTROL_TRUE;
  53         if (info->sequence->width >> 1 == info->sequence->chroma_width &&
  54                 info->sequence->height == info->sequence->chroma_height &&
  55             (*((int*)arg)) == IMGFMT_422P)
  56             return CONTROL_TRUE;
  57         return CONTROL_FALSE;
  58     }
  59
  60     return CONTROL_UNKNOWN;
  61 }
  62
  63 // init driver
  64 static int init(sh_video_t *sh){
  65     vd_libmpeg2_ctx_t *context;
  66     mpeg2dec_t * mpeg2dec;
  67 //    const mpeg2_info_t * info;
  68     int accel;
  69
  70     accel = 0;
  71     if(gCpuCaps.hasMMX)
  72        accel |= MPEG2_ACCEL_X86_MMX;
  73     if(gCpuCaps.hasMMX2)
  74        accel |= MPEG2_ACCEL_X86_MMXEXT;
  75     if(gCpuCaps.has3DNow)
  76        accel |= MPEG2_ACCEL_X86_3DNOW;
  77     if(gCpuCaps.hasSSE2)
  78        accel |= MPEG2_ACCEL_X86_SSE2;
  79     if(gCpuCaps.hasAltiVec)
  80        accel |= MPEG2_ACCEL_PPC_ALTIVEC;
  81     #if ARCH_ALPHA
  82        accel |= MPEG2_ACCEL_ALPHA;
  83     #elif ARCH_ARM
  84        accel |= MPEG2_ACCEL_ARM;
  85     #endif
  86     #if HAVE_MVI
  87        accel |= MPEG2_ACCEL_ALPHA_MVI;
  88     #elif HAVE_VIS
  89        accel |= MPEG2_ACCEL_SPARC_VIS;
  90     #endif
  91     mpeg2_accel(accel);
  92
  93     mpeg2dec = mpeg2_init ();
  94
  95     if(!mpeg2dec) return 0;
  96
  97     mpeg2_custom_fbuf(mpeg2dec,1); // enable DR1
  98
  99     context = calloc(1, sizeof(vd_libmpeg2_ctx_t));
 100     context->mpeg2dec = mpeg2dec;
 101     sh->context = context;
 102
 103     mpeg2dec->pending_buffer = 0;
 104     mpeg2dec->pending_length = 0;
 105
 106     return 1;
 107 }
 108
 109 // uninit driver
 110 static void uninit(sh_video_t *sh){
 111     int i;
 112     vd_libmpeg2_ctx_t *context = sh->context;
 113     mpeg2dec_t * mpeg2dec = context->mpeg2dec;
 114     if (mpeg2dec->pending_buffer) free(mpeg2dec->pending_buffer);
 115     mpeg2dec->decoder.convert=NULL;
 116     mpeg2dec->decoder.convert_id=NULL;
 117     mpeg2_close (mpeg2dec);
 118     for (i=0; i < 3; i++)
 119         free(context->quant_store[i]);
 120     free(sh->context);
 121 }
 122
 123 static void draw_slice (void * _sh, uint8_t * const * src, unsigned int y){
 124     sh_video_t* sh = (sh_video_t*) _sh;
 125     vd_libmpeg2_ctx_t *context = sh->context;
 126     mpeg2dec_t* mpeg2dec = context->mpeg2dec;
 127     const mpeg2_info_t * info = mpeg2_info (mpeg2dec);
 128     int stride[MP_MAX_PLANES] = {mpeg2dec->decoder.stride, mpeg2dec->decoder.uv_stride, mpeg2dec->decoder.uv_stride};
 129     uint8_t *srcs[MP_MAX_PLANES] = {src[0], src[1], src[2]};
 130
 131 //  printf("draw_slice() y=%d  \n",y);
 132
 133     mpcodecs_draw_slice(sh, srcs,
 134                 stride, info->sequence->picture_width,
 135                 (y+16<=info->sequence->picture_height) ? 16 :
 136                     info->sequence->picture_height-y,
 137                 0, y);
 138 }
 139
 140 // decode a frame
 141 static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){
 142     vd_libmpeg2_ctx_t *context = sh->context;
 143     mpeg2dec_t * mpeg2dec = context->mpeg2dec;
 144     const mpeg2_info_t * info = mpeg2_info (mpeg2dec);
 145     int drop_frame, framedrop=flags&3;
 146
 147     // MPlayer registers its own draw_slice callback, prevent libmpeg2 from freeing the context
 148     mpeg2dec->decoder.convert=NULL;
 149     mpeg2dec->decoder.convert_id=NULL;
 150
 151     if(len<=0) return NULL; // skipped null frame
 152
 153     // append extra 'end of frame' code:
 154     ((char*)data+len)[0]=0;
 155     ((char*)data+len)[1]=0;
 156     ((char*)data+len)[2]=1;
 157     ((char*)data+len)[3]=0xff;
 158     len+=4;
 159
 160     if (mpeg2dec->pending_length) {
 161         mpeg2_buffer (mpeg2dec, mpeg2dec->pending_buffer, mpeg2dec->pending_buffer + mpeg2dec->pending_length);
 162     } else {
 163         mpeg2_buffer (mpeg2dec, data, (uint8_t *)data+len);
 164     }
 165
 166     while(1){
 167         int state=mpeg2_parse (mpeg2dec);
 168         int type, use_callback;
 169         mp_image_t* mpi_new;
 170         unsigned long pw, ph;
 171         int imgfmt;
 172
 173         switch(state){
 174         case STATE_BUFFER:
 175             if (mpeg2dec->pending_length) {
 176                 // just finished the pending data, continue with processing of the passed buffer
 177                 mpeg2dec->pending_length = 0;
 178                 mpeg2_buffer (mpeg2dec, data, (uint8_t *)data+len);
 179             } else {
 180                 // parsing of the passed buffer finished, return.
 181                 return 0;
 182             }
 183             break;
 184         case STATE_SEQUENCE:
 185             pw = info->sequence->display_width * info->sequence->pixel_width;
 186             ph = info->sequence->display_height * info->sequence->pixel_height;
 187             if(ph) sh->aspect = (float) pw / (float) ph;
 188             // video parameters initialized/changed, (re)init libvo:
 189             if (info->sequence->width >> 1 == info->sequence->chroma_width &&
 190                 info->sequence->height >> 1 == info->sequence->chroma_height) {
 191                 imgfmt = IMGFMT_YV12;
 192             } else if (info->sequence->width >> 1 == info->sequence->chroma_width &&
 193                 info->sequence->height == info->sequence->chroma_height) {
 194                 imgfmt = IMGFMT_422P;
 195             } else return 0;
 196             if (imgfmt == context->imgfmt &&
 197                 info->sequence->picture_width == context->width &&
 198                 info->sequence->picture_height == context->height &&
 199                 sh->aspect == context->aspect)
 200                 break;
 201             if(!mpcodecs_config_vo(sh,
 202                   info->sequence->picture_width,
 203                   info->sequence->picture_height, imgfmt))
 204                 return 0;
 205             context->imgfmt = imgfmt;
 206             context->width = info->sequence->picture_width;
 207             context->height = info->sequence->picture_height;
 208             context->aspect = sh->aspect;
 209             break;
 210         case STATE_PICTURE:
 211             type=info->current_picture->flags&PIC_MASK_CODING_TYPE;
 212
 213             drop_frame = framedrop && (mpeg2dec->decoder.coding_type == B_TYPE);
 214             drop_frame |= framedrop>=2; // hard drop
 215             if (drop_frame) {
 216                mpeg2_skip(mpeg2dec, 1);
 217                //printf("Dropping Frame ...\n");
 218                break;
 219             }
 220             mpeg2_skip(mpeg2dec, 0); //mpeg2skip skips frames until set again to 0
 221
 222             use_callback = (!framedrop && vd_use_slices &&
 223                             (info->current_picture->flags&PIC_FLAG_PROGRESSIVE_FRAME)) ?
 224                             MP_IMGFLAG_DRAW_CALLBACK:0;
 225
 226             // get_buffer "callback":
 227             mpi_new=mpcodecs_get_image(sh,MP_IMGTYPE_IPB,
 228                                        (type==PIC_FLAG_CODING_TYPE_B) ?
 229                                         use_callback : (MP_IMGFLAG_PRESERVE|MP_IMGFLAG_READABLE),
 230                                        info->sequence->width,
 231                                        info->sequence->height);
 232
 233             if(!mpi_new) return 0; // VO ERROR!!!!!!!!
 234             mpeg2_set_buf(mpeg2dec, mpi_new->planes, mpi_new);
 235             mpi_new->stride[0] = info->sequence->width;
 236             mpi_new->stride[1] = info->sequence->chroma_width;
 237             mpi_new->stride[2] = info->sequence->chroma_width;
 238             if (info->current_picture->flags&PIC_FLAG_TOP_FIELD_FIRST)
 239                 mpi_new->fields |= MP_IMGFIELD_TOP_FIRST;
 240             else mpi_new->fields &= ~MP_IMGFIELD_TOP_FIRST;
 241             if (info->current_picture->flags&PIC_FLAG_REPEAT_FIRST_FIELD)
 242                 mpi_new->fields |= MP_IMGFIELD_REPEAT_FIRST;
 243             else mpi_new->fields &= ~MP_IMGFIELD_REPEAT_FIRST;
 244             mpi_new->fields |= MP_IMGFIELD_ORDERED;
 245             if (!(info->current_picture->flags&PIC_FLAG_PROGRESSIVE_FRAME))
 246                 mpi_new->fields |= MP_IMGFIELD_INTERLACED;
 247
 248 #ifdef MPEG12_POSTPROC
 249             mpi_new->qstride=info->sequence->width>>4;
 250             {
 251             char **p = &context->quant_store[type==PIC_FLAG_CODING_TYPE_B ?
 252                                         2 : (context->quant_store_idx ^= 1)];
 253             *p = realloc(*p, mpi_new->qstride*(info->sequence->height>>4));
 254             mpi_new->qscale = *p;
 255             }
 256             mpeg2dec->decoder.quant_store=mpi_new->qscale;
 257             mpeg2dec->decoder.quant_stride=mpi_new->qstride;
 258             mpi_new->pict_type=type; // 1->I, 2->P, 3->B
 259             mpi_new->qscale_type= 1;
 260 #endif
 261
 262             if (mpi_new->flags&MP_IMGFLAG_DRAW_CALLBACK
 263                 && !(mpi_new->flags&MP_IMGFLAG_DIRECT)) {
 264                 // nice, filter/vo likes draw_callback :)
 265                 mpeg2dec->decoder.convert=draw_slice;
 266                 mpeg2dec->decoder.convert_id=sh;
 267             } else {
 268                 mpeg2dec->decoder.convert=NULL;
 269                 mpeg2dec->decoder.convert_id=NULL;
 270             }
 271
 272             break;
 273         case STATE_SLICE:
 274         case STATE_END:
 275         case STATE_INVALID_END:
 276             // decoding done:
 277             if(info->display_fbuf) {
 278                 mp_image_t* mpi = info->display_fbuf->id;
 279                 if (mpeg2dec->pending_length == 0) {
 280                     mpeg2dec->pending_length = mpeg2dec->buf_end - mpeg2dec->buf_start;
 281                     mpeg2dec->pending_buffer = realloc(mpeg2dec->pending_buffer, mpeg2dec->pending_length);
 282                     memcpy(mpeg2dec->pending_buffer, mpeg2dec->buf_start, mpeg2dec->pending_length);
 283                 } else {
 284                     // still some data in the pending buffer, shouldn't happen
 285                     mpeg2dec->pending_length = mpeg2dec->buf_end - mpeg2dec->buf_start;
 286                     memmove(mpeg2dec->pending_buffer, mpeg2dec->buf_start, mpeg2dec->pending_length);
 287                     mpeg2dec->pending_buffer = realloc(mpeg2dec->pending_buffer, mpeg2dec->pending_length + len);
 288                     memcpy(mpeg2dec->pending_buffer+mpeg2dec->pending_length, data, len);
 289                     mpeg2dec->pending_length += len;
 290                 }
 291 //              fprintf(stderr, "pending = %d\n", mpeg2dec->pending_length);
 292                 return mpi;
 293             }
 294         }
 295     }
 296 }