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#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include "mp_msg.h"
#include "vd_internal.h"
#include "libavutil/lzo.h"
#define MOD_NAME "DecLZO"
static const vd_info_t info = {
"LZO compressed Video",
"lzo",
"Tilmann Bitterberg",
"Transcode development team <http://www.theorie.physik.uni-goettingen.de/~ostreich/transcode/>",
"based on liblzo: http://www.oberhumer.com/opensource/lzo/"
};
LIBVD_EXTERN(lzo)
typedef struct {
uint8_t *buffer;
int bufsz;
int codec;
} lzo_context_t;
// to set/get/query special features/parameters
static int control (sh_video_t *sh, int cmd, void* arg, ...)
{
lzo_context_t *priv = sh->context;
switch(cmd){
case VDCTRL_QUERY_FORMAT:
if (*(int *)arg == priv->codec) return CONTROL_TRUE;
return CONTROL_FALSE;
}
return CONTROL_UNKNOWN;
}
// init driver
static int init(sh_video_t *sh)
{
lzo_context_t *priv;
if (sh->bih->biSizeImage <= 0) {
mp_msg (MSGT_DECVIDEO, MSGL_ERR, "[%s] Invalid frame size\n", MOD_NAME);
return 0;
}
priv = malloc(sizeof(lzo_context_t));
if (!priv)
{
mp_msg (MSGT_DECVIDEO, MSGL_ERR, "[%s] memory allocation failed\n", MOD_NAME);
return 0;
}
priv->bufsz = sh->bih->biSizeImage;
priv->buffer = malloc(priv->bufsz + LZO_OUTPUT_PADDING);
priv->codec = -1;
sh->context = priv;
return 1;
}
// uninit driver
static void uninit(sh_video_t *sh)
{
lzo_context_t *priv = sh->context;
if (priv)
{
free(priv->buffer);
free(priv);
}
sh->context = NULL;
}
// decode a frame
static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags)
{
int r;
mp_image_t* mpi;
lzo_context_t *priv = sh->context;
int w = priv->bufsz;
if (len <= 0) {
return NULL; // skipped frame
}
r = lzo1x_decode(priv->buffer, &w, data, &len);
if (r) {
/* this should NEVER happen */
mp_msg (MSGT_DECVIDEO, MSGL_ERR,
"[%s] internal error - decompression failed: %d\n", MOD_NAME, r);
return NULL;
}
if (priv->codec == -1) {
// detect RGB24 vs. YV12 via decoded size
mp_msg (MSGT_DECVIDEO, MSGL_V, "[%s] 2 depth %d, format %d data %p len (%d) (%d)\n",
MOD_NAME, sh->bih->biBitCount, sh->format, data, len, sh->bih->biSizeImage
);
if (w == 0) {
priv->codec = IMGFMT_BGR24;
mp_msg (MSGT_DECVIDEO, MSGL_V, "[%s] codec choosen is BGR24\n", MOD_NAME);
} else if (w == (sh->bih->biSizeImage)/2) {
priv->codec = IMGFMT_YV12;
mp_msg (MSGT_DECVIDEO, MSGL_V, "[%s] codec choosen is YV12\n", MOD_NAME);
} else {
priv->codec = -1;
mp_msg(MSGT_DECVIDEO,MSGL_ERR,"[%s] Unsupported out_fmt\n", MOD_NAME);
return NULL;
}
if(!mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,priv->codec)) {
priv->codec = -1;
return NULL;
}
}
mpi = mpcodecs_get_image(sh, MP_IMGTYPE_EXPORT, 0,
sh->disp_w, sh->disp_h);
if (!mpi) {
mp_msg (MSGT_DECVIDEO, MSGL_ERR, "[%s] mpcodecs_get_image failed\n", MOD_NAME);
return NULL;
}
mpi->planes[0] = priv->buffer;
if (priv->codec == IMGFMT_BGR24)
mpi->stride[0] = 3 * sh->disp_w;
else {
mpi->stride[0] = sh->disp_w;
mpi->planes[2] = priv->buffer + sh->disp_w*sh->disp_h;
mpi->stride[2] = sh->disp_w / 2;
mpi->planes[1] = priv->buffer + sh->disp_w*sh->disp_h*5/4;
mpi->stride[1] = sh->disp_w / 2;
}
mp_msg (MSGT_DECVIDEO, MSGL_DBG2,
"[%s] decompressed %lu bytes into %lu bytes\n", MOD_NAME,
(long) len, (long)w);
return mpi;
}
/* vim: sw=4
*/
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