mirror of
https://github.com/mpv-player/mpv
synced 2024-12-24 07:42:17 +00:00
1b667f61ba
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7181 b3059339-0415-0410-9bf9-f77b7e298cf2
435 lines
12 KiB
C
435 lines
12 KiB
C
#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 "vd_internal.h"
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static vd_info_t info = {
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"Microsoft RLE decoder",
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"msrle",
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"Mike Melanson",
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"Mike Melanson",
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"native codec"
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};
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LIBVD_EXTERN(msrle)
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// to set/get/query special features/parameters
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static int control(sh_video_t *sh,int cmd,void* arg,...){
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return CONTROL_UNKNOWN;
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}
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// init driver
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static int init(sh_video_t *sh){
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unsigned char *palette_map = NULL;
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unsigned char *orig_map = (unsigned char *)sh->bih+40;
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int i;
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unsigned short color;
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unsigned char r, g, b;
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int bits_per_pixel = sh->codec->outfmt[sh->outfmtidx] & 255;
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// convert the palette for the requested output format
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switch (bits_per_pixel)
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{
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case 15:
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case 16:
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if ((palette_map =
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(unsigned char *)malloc(sh->bih->biClrUsed * 2)) == NULL)
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return 0;
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for (i = 0; i < sh->bih->biClrUsed; i++)
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{
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r = orig_map[i * 4 + 2];
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g = orig_map[i * 4 + 1];
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b = orig_map[i * 4 + 0];
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if (bits_per_pixel == 15)
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color = ((r>>3)<<10) | ((g>>3)<<5) | ((b>>3));
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else
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color = ((r>>3)<<11) | ((g>>2)<<5) | ((b>>3));
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palette_map[i * 2 + 1] = color >> 8;
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palette_map[i * 2 + 0] = color & 0xFF;
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}
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break;
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case 24:
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case 32:
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if ((palette_map =
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(unsigned char *)malloc(sh->bih->biClrUsed * 4)) == NULL)
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return 0;
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memcpy(palette_map, orig_map, sh->bih->biClrUsed * 4);
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break;
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}
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sh->context = palette_map;
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return mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,IMGFMT_BGR24);
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}
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// uninit driver
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static void uninit(sh_video_t *sh){
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unsigned char *palette_map = (unsigned char *)sh->context;
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free(palette_map);
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}
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#define FETCH_NEXT_STREAM_BYTE() \
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if (stream_ptr >= encoded_size) \
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{ \
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mp_msg(MSGT_DECVIDEO, MSGL_WARN, \
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"MS RLE: stream ptr just went out of bounds (1)\n"); \
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return; \
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} \
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stream_byte = encoded[stream_ptr++];
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void decode_msrle4(
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unsigned char *encoded,
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int encoded_size,
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unsigned char *decoded,
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int width,
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int height,
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unsigned char *palette_map,
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int bits_per_pixel)
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{
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int bytes_per_pixel = (bits_per_pixel + 1) / 8;
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unsigned char r1, g1, b1; // for 24/32 bpp
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unsigned char r2, g2, b2;
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unsigned char color_hi1, color_lo1; // for 15/16 bpp
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unsigned char color_hi2, color_lo2;
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int stream_ptr = 0;
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unsigned char rle_code;
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unsigned char extra_byte;
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unsigned char stream_byte;
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int frame_size = width * height * bytes_per_pixel;
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int pixel_ptr = 0;
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int row_dec = width * bytes_per_pixel;
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int row_ptr = (height - 1) * row_dec;
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int i;
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r1 = r2 = g1 = g2 = b1 = b2 =
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color_hi1 = color_hi2 = color_lo1 = color_lo2 = 0;
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while (row_ptr >= 0)
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{
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FETCH_NEXT_STREAM_BYTE();
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rle_code = stream_byte;
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if (rle_code == 0)
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{
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// fetch the next byte to see how to handle escape code
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FETCH_NEXT_STREAM_BYTE();
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if (stream_byte == 0)
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{
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// line is done, goto the next one
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row_ptr -= row_dec;
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pixel_ptr = 0;
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}
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else if (stream_byte == 1)
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// decode is done
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return;
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else if (stream_byte == 2)
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{
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// reposition frame decode coordinates
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FETCH_NEXT_STREAM_BYTE();
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pixel_ptr += stream_byte * bytes_per_pixel;
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FETCH_NEXT_STREAM_BYTE();
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row_ptr -= stream_byte * row_dec;
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}
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else
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{
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// copy pixels from encoded stream
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rle_code = stream_byte;
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rle_code /= 2;
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extra_byte = rle_code & 0x01;
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if ((row_ptr + pixel_ptr + rle_code * bytes_per_pixel > frame_size) ||
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(row_ptr < 0))
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{
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mp_msg(MSGT_DECVIDEO, MSGL_WARN,
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"MS RLE: frame ptr just went out of bounds (1)\n");
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return;
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}
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for (i = 0; i < rle_code; i++)
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{
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if (pixel_ptr >= row_dec)
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break;
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if (bytes_per_pixel == 2)
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{
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color_hi1 = palette_map[(encoded[stream_ptr + i] >> 4) * 2 + 0];
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color_lo1 = palette_map[(encoded[stream_ptr + i] >> 4) * 2 + 1];
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decoded[row_ptr + pixel_ptr + 0] = color_hi1;
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decoded[row_ptr + pixel_ptr + 1] = color_lo1;
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}
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else
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{
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r1 = palette_map[(encoded[stream_ptr + i] >> 4) * 4 + 2];
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g1 = palette_map[(encoded[stream_ptr + i] >> 4) * 4 + 1];
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b1 = palette_map[(encoded[stream_ptr + i] >> 4) * 4 + 0];
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decoded[row_ptr + pixel_ptr + 0] = b1;
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decoded[row_ptr + pixel_ptr + 1] = g1;
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decoded[row_ptr + pixel_ptr + 2] = r1;
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}
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pixel_ptr += bytes_per_pixel;
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if (pixel_ptr >= row_dec)
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break;
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if (bytes_per_pixel == 2)
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{
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color_hi1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 2 + 0];
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color_lo1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 2 + 1];
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decoded[row_ptr + pixel_ptr + 0] = color_hi1;
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decoded[row_ptr + pixel_ptr + 1] = color_lo1;
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}
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else
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{
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r1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 4 + 2];
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g1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 4 + 1];
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b1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 4 + 0];
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decoded[row_ptr + pixel_ptr + 0] = b1;
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decoded[row_ptr + pixel_ptr + 1] = g1;
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decoded[row_ptr + pixel_ptr + 2] = r1;
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}
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pixel_ptr += bytes_per_pixel;
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}
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stream_ptr += rle_code;
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// if the RLE code is odd, skip a byte in the stream
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if (extra_byte)
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stream_ptr++;
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}
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}
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else
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{
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// decode a run of data
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FETCH_NEXT_STREAM_BYTE();
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if (bytes_per_pixel == 2)
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{
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color_hi1 = palette_map[(stream_byte >> 4) * 2 + 0];
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color_lo1 = palette_map[(stream_byte >> 4) * 2 + 1];
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color_hi2 = palette_map[(stream_byte & 0x0F) * 2 + 0];
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color_lo2 = palette_map[(stream_byte & 0x0F) * 2 + 1];
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}
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else
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{
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r1 = palette_map[(stream_byte >> 4) * 4 + 2];
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g1 = palette_map[(stream_byte >> 4) * 4 + 1];
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b1 = palette_map[(stream_byte >> 4) * 4 + 0];
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r2 = palette_map[(stream_byte & 0x0F) * 4 + 2];
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g2 = palette_map[(stream_byte & 0x0F) * 4 + 1];
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b2 = palette_map[(stream_byte & 0x0F) * 4 + 0];
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}
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for (i = 0; i < rle_code; i++)
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{
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if (pixel_ptr >= row_dec)
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break;
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if ((i & 1) == 0)
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{
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if (bytes_per_pixel == 2)
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{
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decoded[row_ptr + pixel_ptr + 0] = color_hi1;
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decoded[row_ptr + pixel_ptr + 1] = color_lo1;
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}
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else
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{
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decoded[row_ptr + pixel_ptr + 0] = b1;
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decoded[row_ptr + pixel_ptr + 1] = g1;
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decoded[row_ptr + pixel_ptr + 2] = r1;
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}
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}
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else
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{
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if (bytes_per_pixel == 2)
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{
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decoded[row_ptr + pixel_ptr + 0] = color_hi2;
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decoded[row_ptr + pixel_ptr + 1] = color_lo2;
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}
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else
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{
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decoded[row_ptr + pixel_ptr + 0] = b2;
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decoded[row_ptr + pixel_ptr + 1] = g2;
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decoded[row_ptr + pixel_ptr + 2] = r2;
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}
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}
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pixel_ptr += bytes_per_pixel;
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}
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}
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}
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// one last sanity check on the way out
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if (stream_ptr < encoded_size)
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mp_msg(MSGT_DECVIDEO, MSGL_WARN,
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"MS RLE: ended frame decode with bytes left over (%d < %d)\n",
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stream_ptr, encoded_size);
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}
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void decode_msrle8(
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unsigned char *encoded,
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int encoded_size,
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unsigned char *decoded,
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int width,
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int height,
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unsigned char *palette_map,
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int bits_per_pixel)
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{
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int bytes_per_pixel = (bits_per_pixel + 1) / 8;
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unsigned char r, g, b; // for 24/32 bpp
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unsigned char color_hi, color_lo; // for 15/16 bpp
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int stream_ptr = 0;
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unsigned char rle_code;
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unsigned char extra_byte;
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unsigned char stream_byte;
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int frame_size = width * height * bytes_per_pixel;
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int pixel_ptr = 0;
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int row_dec = width * bytes_per_pixel;
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int row_ptr = (height - 1) * row_dec;
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r = g = b = color_hi = color_lo = 0;
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while (row_ptr >= 0)
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{
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FETCH_NEXT_STREAM_BYTE();
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rle_code = stream_byte;
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if (rle_code == 0)
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{
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// fetch the next byte to see how to handle escape code
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FETCH_NEXT_STREAM_BYTE();
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if (stream_byte == 0)
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{
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// line is done, goto the next one
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row_ptr -= row_dec;
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pixel_ptr = 0;
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}
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else if (stream_byte == 1)
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// decode is done
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return;
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else if (stream_byte == 2)
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{
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// reposition frame decode coordinates
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FETCH_NEXT_STREAM_BYTE();
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pixel_ptr += stream_byte * bytes_per_pixel;
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FETCH_NEXT_STREAM_BYTE();
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row_ptr -= stream_byte * row_dec;
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}
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else
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{
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// copy pixels from encoded stream
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if ((row_ptr + pixel_ptr + stream_byte * bytes_per_pixel > frame_size) ||
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(row_ptr < 0))
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{
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mp_msg(MSGT_DECVIDEO, MSGL_WARN,
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"MS RLE: frame ptr just went out of bounds (1)\n");
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return;
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}
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rle_code = stream_byte;
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extra_byte = stream_byte & 0x01;
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if (stream_ptr + rle_code + extra_byte > encoded_size)
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{
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mp_msg(MSGT_DECVIDEO, MSGL_WARN,
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"MS RLE: stream ptr just went out of bounds (2)\n");
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return;
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}
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while (rle_code--)
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{
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FETCH_NEXT_STREAM_BYTE();
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if (bytes_per_pixel == 2)
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{
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color_hi = palette_map[stream_byte * 2 + 0];
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color_lo = palette_map[stream_byte * 2 + 1];
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decoded[row_ptr + pixel_ptr + 0] = color_hi;
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decoded[row_ptr + pixel_ptr + 1] = color_lo;
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}
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else
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{
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r = palette_map[stream_byte * 4 + 2];
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g = palette_map[stream_byte * 4 + 1];
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b = palette_map[stream_byte * 4 + 0];
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decoded[row_ptr + pixel_ptr + 0] = b;
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decoded[row_ptr + pixel_ptr + 1] = g;
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decoded[row_ptr + pixel_ptr + 2] = r;
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}
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pixel_ptr += bytes_per_pixel;
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}
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// if the RLE code is odd, skip a byte in the stream
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if (extra_byte)
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stream_ptr++;
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}
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}
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else
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{
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// decode a run of data
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if ((row_ptr + pixel_ptr + stream_byte * bytes_per_pixel > frame_size) ||
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(row_ptr < 0))
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{
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mp_msg(MSGT_DECVIDEO, MSGL_WARN,
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"MS RLE: frame ptr just went out of bounds (2)\n");
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return;
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}
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FETCH_NEXT_STREAM_BYTE();
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if (bytes_per_pixel == 2)
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{
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color_hi = palette_map[stream_byte * 2 + 0];
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color_lo = palette_map[stream_byte * 2 + 1];
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}
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else
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{
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r = palette_map[stream_byte * 4 + 2];
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g = palette_map[stream_byte * 4 + 1];
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b = palette_map[stream_byte * 4 + 0];
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}
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while(rle_code--)
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{
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if (bytes_per_pixel == 2)
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{
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decoded[row_ptr + pixel_ptr + 0] = color_hi;
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decoded[row_ptr + pixel_ptr + 1] = color_lo;
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}
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else
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{
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decoded[row_ptr + pixel_ptr + 0] = b;
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decoded[row_ptr + pixel_ptr + 1] = g;
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decoded[row_ptr + pixel_ptr + 2] = r;
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}
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pixel_ptr += bytes_per_pixel;
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}
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}
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}
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// one last sanity check on the way out
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if (stream_ptr < encoded_size)
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mp_msg(MSGT_DECVIDEO, MSGL_WARN,
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"MS RLE: ended frame decode with bytes left over (%d < %d)\n",
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stream_ptr, encoded_size);
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}
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// decode a frame
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static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){
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mp_image_t* mpi;
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if(len<=0) return NULL; // skipped frame
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mpi=mpcodecs_get_image(sh, MP_IMGTYPE_STATIC, MP_IMGFLAG_PRESERVE,
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sh->disp_w, sh->disp_h);
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if(!mpi) return NULL;
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if (sh->format == 1)
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decode_msrle8(
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data,len, mpi->planes[0],
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sh->disp_w, sh->disp_h,
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(unsigned char *)sh->context,
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mpi->imgfmt & 255);
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else if (sh->format == 2)
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decode_msrle4(
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data,len, mpi->planes[0],
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sh->disp_w, sh->disp_h,
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(unsigned char *)sh->context,
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mpi->imgfmt & 255);
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else
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mp_msg(MSGT_DECVIDEO, MSGL_WARN,
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"MS RLE: Don't know how to decode format %08X", sh->format);
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return mpi;
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}
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