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/*
AVIzlib decoder
http://www.pcisys.net/~melanson/codecs/lcl.txt
*/
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#ifdef HAVE_ZLIB
#include "mp_msg.h"
#include <zlib.h>
#include "vd_internal.h"
static vd_info_t info = {
"AVIzlib decoder",
"zlib",
"Alex",
"Alex",
"based on vd_ijpg.c, uses zlib, supports only BGR24 (as AVIzlib)"
};
LIBVD_EXTERN(zlib)
typedef struct {
int width;
int height;
int imgformat;
int decompsize;
z_stream zstrm;
} vd_zlib_ctx;
/* BITMAPINFOHEADER LCL Extension */
typedef struct {
unsigned char filler[sizeof(BITMAPINFOHEADER)];
unsigned char unknown[4];
unsigned char imgtype;
unsigned char compression;
unsigned char flags;
unsigned char codec;
} bih_lcl_ext;
// to set/get/query special features/parameters
static int control(sh_video_t *sh, int cmd, void *arg, ...)
{
vd_zlib_ctx *ctx = sh->context;
switch(cmd)
{
case VDCTRL_QUERY_FORMAT:
{
if (*((int*)arg) == (ctx->imgformat))
return(CONTROL_TRUE);
else
return(CONTROL_FALSE);
}
}
return(CONTROL_UNKNOWN);
}
// init driver
static int init(sh_video_t *sh)
{
int zret;
vd_zlib_ctx *ctx;
bih_lcl_ext *ext;
ctx = sh->context = malloc(sizeof(vd_zlib_ctx));
if (!ctx)
return(0);
memset(ctx, 0, sizeof(vd_zlib_ctx));
ctx->width = sh->bih->biWidth;
ctx->height = sh->bih->biHeight;
ctx->imgformat = IMGFMT_BGR24;
ctx->decompsize = ctx->width*ctx->height*((24+7)/8);
if (sh->bih->biSize > sizeof(BITMAPINFOHEADER))
{
ext = sh->bih;
if (ext->codec != 3) /* 1 == MSZH, 3 == ZLIB */
return(0);
switch(ext->imgtype)
{
case 2: /* RGB24 */
ctx->imgformat = IMGFMT_BGR24;
ctx->decompsize = ctx->width*ctx->height*((24+7)/8);
break;
case 0: /* YUV411 */
// ctx->imgformat = IMGFMT_YVU9;
// ctx->decompsize = ctx->width*(ctx->height+2)/8*9;
// break;
case 1: /* YUV422 */
// ctx->imgformat = IMGFMT_YUY2;
// ctx->decompsize = ctx->width*(ctx->height+2)/8*16;
// break;
case 5: /* YUV420 */
// ctx->imgformat = IMGFMT_YV12;
// ctx->decompsize = ctx->width*(ctx->height+2)/8*12;
// break;
case 3: /* YUV411 */
case 4: /* YUV211 */
default:
printf("Unknown imgtype\n");
return(0);
}
}
ctx->zstrm.zalloc = (alloc_func)NULL;
ctx->zstrm.zfree = (free_func)NULL;
ctx->zstrm.opaque = (voidpf)NULL;
zret = inflateInit(&ctx->zstrm);
if (zret != Z_OK)
{
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[vd_zlib] inflate init error: %d\n",
zret);
return(NULL);
}
if (!mpcodecs_config_vo(sh, ctx->width, ctx->height, ctx->imgformat))
return(NULL);
return(1);
}
// uninit driver
static void uninit(sh_video_t *sh)
{
vd_zlib_ctx *ctx = sh->context;
inflateEnd(&ctx->zstrm);
if (ctx)
free(ctx);
}
//mp_image_t* mpcodecs_get_image(sh_video_t *sh, int mp_imgtype, int mp_imgflag, int w, int h);
// decode a frame
static mp_image_t* decode(sh_video_t *sh, void* data, int len, int flags)
{
mp_image_t *mpi;
vd_zlib_ctx *ctx = sh->context;
int zret;
z_stream *zstrm = &ctx->zstrm;
if (len <= 0)
return(NULL); // skipped frame
mpi = mpcodecs_get_image(sh, MP_IMGTYPE_TEMP, 0, ctx->width, ctx->height);
if (!mpi) return(NULL);
zstrm->next_in = data;
zstrm->avail_in = len;
zstrm->next_out = mpi->planes[0];
zstrm->avail_out = ctx->decompsize;
mp_dbg(MSGT_DECVIDEO, MSGL_DBG2, "[vd_zlib] input: %p (%d bytes), output: %p (%d bytes)\n",
zstrm->next_in, zstrm->avail_in, zstrm->next_out, zstrm->avail_out);
zret = inflate(zstrm, Z_NO_FLUSH);
if ((zret != Z_OK) && (zret != Z_STREAM_END))
{
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[vd_zlib] inflate error: %d\n",
zret);
return(NULL);
}
if (ctx->decompsize != (int)zstrm->total_out)
{
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[vd_zlib] decoded size differs (%d != %d)\n",
ctx->decompsize, zstrm->total_out);
return(NULL);
}
return mpi;
}
#endif
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