libmpcodecs/vd_lzo.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21
  22 #include "config.h"
  23 #include "mp_msg.h"
  24
  25 #include "vd_internal.h"
  26 #include "libavutil/lzo.h"
  27
  28 #define MOD_NAME "DecLZO"
  29
  30 static const vd_info_t info = {
  31         "LZO compressed Video",
  32         "lzo",
  33         "Tilmann Bitterberg",
  34         "Transcode development team <http://www.theorie.physik.uni-goettingen.de/~ostreich/transcode/>",
  35         "based on liblzo: http://www.oberhumer.com/opensource/lzo/"
  36 };
  37
  38 LIBVD_EXTERN(lzo)
  39
  40 typedef struct {
  41     uint8_t *buffer;
  42     int bufsz;
  43     int codec;
  44 } lzo_context_t;
  45
  46 // to set/get/query special features/parameters
  47 static int control (sh_video_t *sh, int cmd, void* arg, ...)
  48 {
  49     lzo_context_t *priv = sh->context;
  50     switch(cmd){
  51     case VDCTRL_QUERY_FORMAT:
  52         if (*(int *)arg == priv->codec) return CONTROL_TRUE;
  53         return CONTROL_FALSE;
  54     }
  55     return CONTROL_UNKNOWN;
  56 }
  57
  58
  59 // init driver
  60 static int init(sh_video_t *sh)
  61 {
  62     lzo_context_t *priv;
  63
  64     if (sh->bih->biSizeImage <= 0) {
  65         mp_msg (MSGT_DECVIDEO, MSGL_ERR, "[%s] Invalid frame size\n", MOD_NAME);
  66         return 0;
  67     }
  68
  69     priv = malloc(sizeof(lzo_context_t));
  70     if (!priv)
  71     {
  72         mp_msg (MSGT_DECVIDEO, MSGL_ERR, "[%s] memory allocation failed\n", MOD_NAME);
  73         return 0;
  74     }
  75     priv->bufsz = sh->bih->biSizeImage;
  76     priv->buffer = malloc(priv->bufsz + AV_LZO_OUTPUT_PADDING);
  77     priv->codec = -1;
  78     sh->context = priv;
  79
  80     return 1;
  81 }
  82
  83 // uninit driver
  84 static void uninit(sh_video_t *sh)
  85 {
  86     lzo_context_t *priv = sh->context;
  87
  88     if (priv)
  89     {
  90         free(priv->buffer);
  91         free(priv);
  92     }
  93
  94     sh->context = NULL;
  95 }
  96
  97 // decode a frame
  98 static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags)
  99 {
 100     int r;
 101     mp_image_t* mpi;
 102     lzo_context_t *priv = sh->context;
 103     int w = priv->bufsz;
 104
 105     if (len <= 0) {
 106             return NULL; // skipped frame
 107     }
 108
 109     r = av_lzo1x_decode(priv->buffer, &w, data, &len);
 110     if (r) {
 111         /* this should NEVER happen */
 112         mp_msg (MSGT_DECVIDEO, MSGL_ERR,
 113                 "[%s] internal error - decompression failed: %d\n", MOD_NAME, r);
 114       return NULL;
 115     }
 116
 117     if (priv->codec == -1) {
 118         // detect RGB24 vs. YV12 via decoded size
 119         mp_msg (MSGT_DECVIDEO, MSGL_V, "[%s] 2 depth %d, format %d data %p len (%d) (%d)\n",
 120             MOD_NAME, sh->bih->biBitCount, sh->format, data, len, sh->bih->biSizeImage
 121             );
 122
 123         if (w == 0) {
 124             priv->codec = IMGFMT_BGR24;
 125             mp_msg (MSGT_DECVIDEO, MSGL_V, "[%s] codec choosen is BGR24\n", MOD_NAME);
 126         } else if (w == (sh->bih->biSizeImage)/2) {
 127             priv->codec = IMGFMT_YV12;
 128             mp_msg (MSGT_DECVIDEO, MSGL_V, "[%s] codec choosen is YV12\n", MOD_NAME);
 129         } else {
 130             priv->codec = -1;
 131             mp_msg(MSGT_DECVIDEO,MSGL_ERR,"[%s] Unsupported out_fmt\n", MOD_NAME);
 132             return NULL;
 133         }
 134
 135         if(!mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,priv->codec)) {
 136             priv->codec = -1;
 137             return NULL;
 138         }
 139     }
 140
 141     mpi = mpcodecs_get_image(sh, MP_IMGTYPE_EXPORT, 0,
 142         sh->disp_w, sh->disp_h);
 143
 144
 145     if (!mpi) {
 146             mp_msg (MSGT_DECVIDEO, MSGL_ERR, "[%s] mpcodecs_get_image failed\n", MOD_NAME);
 147             return NULL;
 148     }
 149
 150     mpi->planes[0] = priv->buffer;
 151     if (priv->codec == IMGFMT_BGR24)
 152         mpi->stride[0] = 3 * sh->disp_w;
 153     else {
 154         mpi->stride[0] = sh->disp_w;
 155         mpi->planes[2] = priv->buffer + sh->disp_w*sh->disp_h;
 156         mpi->stride[2] = sh->disp_w / 2;
 157         mpi->planes[1] = priv->buffer + sh->disp_w*sh->disp_h*5/4;
 158         mpi->stride[1] = sh->disp_w / 2;
 159     }
 160
 161     mp_msg (MSGT_DECVIDEO, MSGL_DBG2,
 162                 "[%s] decompressed %lu bytes into %lu bytes\n", MOD_NAME,
 163                 (long) len, (long)w);
 164
 165     return mpi;
 166 }
 167
 168 /* vim: sw=4
 169    */