static int sgi_read(ByteIOContext *f,
int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
{
SGIInfo sgi_info, *s = &sgi_info;
AVImageInfo info1, *info = &info1;
int ret;
read_sgi_header(f, s);
if (s->bytes_per_channel != 1) {
return AVERROR_INVALIDDATA;
}
/* check for supported image dimensions */
if (s->dimension != 2 && s->dimension != 3) {
return AVERROR_INVALIDDATA;
}
if (s->zsize == SGI_GRAYSCALE) {
info->pix_fmt = PIX_FMT_GRAY8;
} else if (s->zsize == SGI_RGB) {
info->pix_fmt = PIX_FMT_RGB24;
} else if (s->zsize == SGI_RGBA) {
info->pix_fmt = PIX_FMT_RGBA32;
} else {
return AVERROR_INVALIDDATA;
}
info->width = s->xsize;
info->height = s->ysize;
ret = alloc_cb(opaque, info);
if (ret)
return ret;
if (s->rle) {
return read_rle_sgi(s, &info->pict, f);
} else {
return read_uncompressed_sgi(s, &info->pict, f);
}
return 0; /* not reached */
}
/* decode a frame */
static
mp_image_t *decode(sh_video_t *sh, void *raw, int len, int flags)
{
SGIInfo *info = sh->context;
unsigned char *data = raw;
mp_image_t *mpi;
if (len <= 0) {
return NULL; /* skip frame */
}
read_sgi_header(data, info);
/* make sure this is an SGI image file */
if (info->magic != SGI_MAGIC) {
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "Bad magic number in image.\n");
return NULL;
}
/* check image depth */
if (info->bytes_per_channel != 1) {
mp_msg(MSGT_DECVIDEO, MSGL_INFO,
"Unsupported bytes per channel value %i.\n", info->bytes_per_channel);
return NULL;
}
/* check image dimension */
if (info->dimension != 2 && info->dimension != 3) {
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "Unsupported image dimension %i.\n",
info->dimension);
return NULL;
}
/* change rgba images to rgb so alpha channel will be ignored */
if (info->zsize == SGI_RGBA_IMAGE) {
info->zsize = SGI_RGB_IMAGE;
}
/* check image depth */
if (info->zsize != SGI_RGB_IMAGE && info->zsize != SGI_GRAYSCALE_IMAGE) {
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "Unsupported image depth.\n");
return NULL;
}
/* (re)init libvo if image size is changed */
if (last_x != info->xsize || last_y != info->ysize)
{
last_x = info->xsize;
last_y = info->ysize;
if (!mpcodecs_config_vo(sh, info->xsize, info->ysize, outfmt)) {
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "Config vo failed:\n");
return NULL;
}
}
if (!(mpi = mpcodecs_get_image(sh, MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
info->xsize, info->ysize))) {
return NULL;
}
if (info->rle) {
decode_rle_sgi(info, data, mpi);
} else {
decode_uncompressed_sgi(info, data, mpi);
}
return mpi;
}
