mirror of https://github.com/mpv-player/mpv
328 lines
7.2 KiB
C
328 lines
7.2 KiB
C
/*
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* author: Todd Kirby <slapcat@pacbell.net>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "config.h"
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#include "mp_msg.h"
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#include "bswap.h"
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#include "vd_internal.h"
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#define SGI_HEADER_LEN 512
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#define SGI_MAGIC 474
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#define SGI_GRAYSCALE_IMAGE 1
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#define SGI_RGB_IMAGE 3
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#define SGI_RGBA_IMAGE 4
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#define OUT_PIXEL_STRIDE 3 /* RGB */
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static vd_info_t info =
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{
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"SGI Image decoder",
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"sgi",
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"Todd Kirby",
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"Todd Kirby",
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""
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};
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LIBVD_EXTERN(sgi)
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typedef struct {
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short magic;
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char rle;
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char bytes_per_channel;
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unsigned short dimension;
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unsigned short xsize;
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unsigned short ysize;
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unsigned short zsize;
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} SGIInfo;
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static unsigned int outfmt = IMGFMT_BGR24;
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static unsigned short last_x = -1;
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static unsigned short last_y = -1;
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/* to set/get/query special features/parameters */
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static int
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control(sh_video_t* sh, int cmd, void *arg, ...)
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{
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switch (cmd)
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{
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case VDCTRL_QUERY_FORMAT:
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if (*((unsigned int *) arg) == outfmt) {
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return CONTROL_TRUE;
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}
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return CONTROL_FALSE;
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}
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return CONTROL_UNKNOWN;
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}
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/* init driver */
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static int
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init(sh_video_t *sh)
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{
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sh->context = (SGIInfo *) calloc(1, sizeof(SGIInfo));
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last_x = -1;
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return 1;
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}
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/* uninit driver */
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static void
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uninit(sh_video_t *sh)
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{
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SGIInfo *info = sh->context;
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free(info);
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}
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/* expand an rle row into a channel */
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static void
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expandrow(unsigned char *optr, unsigned char *iptr, int chan_offset)
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{
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unsigned char pixel, count;
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optr += chan_offset;
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while (1) {
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pixel = *iptr++;
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if (!(count = (pixel & 0x7f))) {
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return;
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}
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if(pixel & 0x80) {
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while (count--) {
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*optr = *iptr;
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optr += OUT_PIXEL_STRIDE;
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iptr++;
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}
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} else {
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pixel = *iptr++;
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while (count--) {
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*optr = pixel;
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optr += OUT_PIXEL_STRIDE;
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}
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}
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}
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}
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/* expand an rle row into all 3 channels.
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a separate function for grayscale so we don't slow down the
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more common case rgb function with a bunch of ifs. */
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static void
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expandrow_gs(unsigned char *optr, unsigned char *iptr)
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{
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unsigned char pixel, count;
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while (1) {
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pixel = *iptr++;
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if (!(count = (pixel & 0x7f))) {
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return;
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}
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if(pixel & 0x80) {
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while (count--) {
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optr[0] = *iptr;
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optr[1] = *iptr;
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optr[2] = *iptr;
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optr += OUT_PIXEL_STRIDE;
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iptr++;
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}
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} else {
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pixel = *iptr++;
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while (count--) {
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optr[0] = pixel;
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optr[1] = pixel;
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optr[2] = pixel;
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optr += OUT_PIXEL_STRIDE;
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}
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}
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}
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}
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/* decode a run length encoded sgi image */
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static void
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decode_rle_sgi(SGIInfo *info, unsigned char *data, mp_image_t *mpi)
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{
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unsigned char *rle_data, *dest_row;
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unsigned long *starttab;
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int y, z, xsize, ysize, zsize, chan_offset;
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long start_offset;
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xsize = info->xsize;
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ysize = info->ysize;
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zsize = info->zsize;
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/* rle offset table is right after the header */
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starttab = (long*)(data + SGI_HEADER_LEN);
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for (z = 0; z < zsize; z++) {
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/* set chan_offset so RGB ends up BGR */
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chan_offset = (zsize - 1) - z;
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/* The origin for SGI images is the lower-left corner
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so read scan lines from bottom to top */
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for (y = ysize - 1; y >= 0; y--) {
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dest_row = mpi->planes[0] + mpi->stride[0] * (ysize - 1 - y);
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/* set start of next run (offsets are from start of header) */
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start_offset = be2me_32(*(unsigned long*) &starttab[y + z * ysize]);
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rle_data = &data[start_offset];
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if(info->zsize == SGI_GRAYSCALE_IMAGE) {
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expandrow_gs(dest_row, rle_data);
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} else {
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expandrow(dest_row, rle_data, chan_offset);
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}
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}
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}
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}
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/* decode an sgi image */
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static void
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decode_uncompressed_sgi(SGIInfo *info, unsigned char *data, mp_image_t *mpi)
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{
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unsigned char *src_row, *dest_row;
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int x, y, z, xsize, ysize, zsize, chan_offset;
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xsize = info->xsize;
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ysize = info->ysize;
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zsize = info->zsize;
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/* skip header */
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data += SGI_HEADER_LEN;
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for (z = 0; z < zsize; z++) {
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/* set row ptr to start of current plane */
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src_row = data + (xsize * ysize * z);
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/* set chan_offset for RGB -> BGR */
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chan_offset = (zsize - 1) - z;
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/* the origin for SGI images is the lower-left corner
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so read scan lines from bottom to top. */
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for (y = ysize - 1; y >= 0; y--) {
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dest_row = mpi->planes[0] + mpi->stride[0] * y;
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for (x = 0; x < xsize; x++) {
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/* we only do 24 bit output so promote 8 bit pixels to 24 */
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if (zsize == SGI_GRAYSCALE_IMAGE) {
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/* write greyscale value into all channels */
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dest_row[0] = src_row[x];
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dest_row[1] = src_row[x];
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dest_row[2] = src_row[x];
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} else {
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dest_row[chan_offset] = src_row[x];
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}
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dest_row += OUT_PIXEL_STRIDE;
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}
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/* move to next row of the current source plane */
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src_row += xsize;
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}
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}
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}
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/* read sgi header fields */
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static void
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read_sgi_header(unsigned char *buf, SGIInfo *info)
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{
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/* sgi data is always stored in big endian byte order */
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info->magic = be2me_16(*(unsigned short *) &buf[0]);
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info->rle = buf[2];
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info->bytes_per_channel = buf[3];
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info->dimension = be2me_16(*(unsigned short *) &buf[4]);
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info->xsize = be2me_16(*(unsigned short *) &buf[6]);
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info->ysize = be2me_16(*(unsigned short *) &buf[8]);
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info->zsize = be2me_16(*(unsigned short *) &buf[10]);
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}
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/* decode a frame */
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static
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mp_image_t *decode(sh_video_t *sh, void *raw, int len, int flags)
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{
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SGIInfo *info = sh->context;
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unsigned char *data = raw;
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mp_image_t *mpi;
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if (len <= 0) {
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return NULL; /* skip frame */
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}
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read_sgi_header(data, info);
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/* make sure this is an SGI image file */
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if (info->magic != SGI_MAGIC) {
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mp_msg(MSGT_DECVIDEO, MSGL_INFO, "Bad magic number in image.\n");
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return NULL;
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}
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/* check image depth */
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if (info->bytes_per_channel != 1) {
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mp_msg(MSGT_DECVIDEO, MSGL_INFO,
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"Unsupported bytes per channel value %i.\n", info->bytes_per_channel);
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return NULL;
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}
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/* check image dimension */
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if (info->dimension != 2 && info->dimension != 3) {
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mp_msg(MSGT_DECVIDEO, MSGL_INFO, "Unsupported image dimension %i.\n",
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info->dimension);
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return NULL;
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}
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/* change rgba images to rgb so alpha channel will be ignored */
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if (info->zsize == SGI_RGBA_IMAGE) {
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info->zsize = SGI_RGB_IMAGE;
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}
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/* check image depth */
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if (info->zsize != SGI_RGB_IMAGE && info->zsize != SGI_GRAYSCALE_IMAGE) {
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mp_msg(MSGT_DECVIDEO, MSGL_INFO, "Unsupported image depth.\n");
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return NULL;
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}
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/* (re)init libvo if image size is changed */
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if (last_x != info->xsize || last_y != info->ysize)
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{
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last_x = info->xsize;
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last_y = info->ysize;
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if (!mpcodecs_config_vo(sh, info->xsize, info->ysize, outfmt)) {
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mp_msg(MSGT_DECVIDEO, MSGL_INFO, "Config vo failed:\n");
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return NULL;
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}
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}
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if (!(mpi = mpcodecs_get_image(sh, MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
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info->xsize, info->ysize))) {
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return NULL;
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}
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if (info->rle) {
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decode_rle_sgi(info, data, mpi);
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} else {
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decode_uncompressed_sgi(info, data, mpi);
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}
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return mpi;
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}
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