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author | arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-04-13 18:03:02 +0000 |
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committer | arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-04-13 18:03:02 +0000 |
commit | 93c499d0432d3b67b50bb8a70a4cb0b76ff3fb33 (patch) | |
tree | d65a40d89e2519ba98a9f8fe7e84a37725525208 /libmpcodecs/native/qtrle.c | |
parent | b48576a528cb746bc9d77769e667684edc069899 (diff) | |
download | mpv-93c499d0432d3b67b50bb8a70a4cb0b76ff3fb33.tar.bz2 mpv-93c499d0432d3b67b50bb8a70a4cb0b76ff3fb33.tar.xz |
moved to libmpcodecs/native/
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@5603 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'libmpcodecs/native/qtrle.c')
-rw-r--r-- | libmpcodecs/native/qtrle.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/libmpcodecs/native/qtrle.c b/libmpcodecs/native/qtrle.c new file mode 100644 index 0000000000..6d46f9b32c --- /dev/null +++ b/libmpcodecs/native/qtrle.c @@ -0,0 +1,125 @@ +/* + Quicktime Animation (RLE) Decoder for MPlayer + + (C) 2001 Mike Melanson +*/ + +#include "config.h" +#include "bswap.h" + +#define BE_16(x) (be2me_16(*(unsigned short *)(x))) +#define BE_32(x) (be2me_32(*(unsigned int *)(x))) + +// 256 RGB entries; 25% of these bytes will be unused, but it's faster +// to index 4-byte entries +static unsigned char palette[256 * 4]; + +void qt_decode_rle24( + unsigned char *encoded, + int encoded_size, + unsigned char *decoded, + int width, + int height, + int bytes_per_pixel) +{ + int stream_ptr; + int header; + int start_line; + int lines_to_change; + signed char rle_code; + int row_ptr, pixel_ptr; + int row_inc = bytes_per_pixel * width; + unsigned char r, g, b; + + // check if this frame is even supposed to change + if (encoded_size < 8) + return; + + // start after the chunk size + stream_ptr = 4; + + // fetch the header + header = BE_16(&encoded[stream_ptr]); + stream_ptr += 2; + + // if a header is present, fetch additional decoding parameters + if (header & 0x0008) + { + start_line = BE_16(&encoded[stream_ptr]); + stream_ptr += 4; + lines_to_change = BE_16(&encoded[stream_ptr]); + stream_ptr += 4; + } + else + { + start_line = 0; + lines_to_change = height; + } + + row_ptr = row_inc * start_line; + while (lines_to_change--) + { + pixel_ptr = row_ptr + ((encoded[stream_ptr++] - 1) * bytes_per_pixel); + + while ((rle_code = (signed char)encoded[stream_ptr++]) != -1) + { + if (rle_code == 0) + // there's another skip code in the stream + pixel_ptr += ((encoded[stream_ptr++] - 1) * bytes_per_pixel); + else if (rle_code < 0) + { + // decode the run length code + rle_code = -rle_code; + r = encoded[stream_ptr++]; + g = encoded[stream_ptr++]; + b = encoded[stream_ptr++]; + while (rle_code--) + { + decoded[pixel_ptr++] = b; + decoded[pixel_ptr++] = g; + decoded[pixel_ptr++] = r; + if (bytes_per_pixel == 4) + pixel_ptr++; + } + } + else + { + // copy pixels directly to output + while (rle_code--) + { + decoded[pixel_ptr++] = encoded[stream_ptr + 2]; + decoded[pixel_ptr++] = encoded[stream_ptr + 1]; + decoded[pixel_ptr++] = encoded[stream_ptr + 0]; + stream_ptr += 3; + if (bytes_per_pixel == 4) + pixel_ptr++; + } + } + } + + row_ptr += row_inc; + } +} + +void qt_decode_rle( + unsigned char *encoded, + int encoded_size, + unsigned char *decoded, + int width, + int height, + int encoded_bpp, + int bytes_per_pixel) +{ + switch (encoded_bpp) + { + case 24: + qt_decode_rle24( + encoded, + encoded_size, + decoded, + width, + height, + bytes_per_pixel); + break; + } +} |