mirror of https://github.com/mpv-player/mpv
394 lines
11 KiB
C
394 lines
11 KiB
C
/*
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Microsoft Video 1 Decoder
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(C) 2001 Mike Melanson
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The description of the algorithm you can read here:
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http://www.pcisys.net/~melanson/codecs/
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32bpp support (c) alex
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*/
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#include "config.h"
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#include "bswap.h"
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#define LE_16(x) (le2me_16(*(unsigned short *)(x)))
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#define DECODE_BGR555_TO_BGR888(x) \
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x.c1_b = (x.c1 >> 7) & 0xF8; \
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x.c1_g = (x.c1 >> 2) & 0xF8; \
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x.c1_r = (x.c1 << 3) & 0xF8; \
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x.c2_b = (x.c2 >> 7) & 0xF8; \
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x.c2_g = (x.c2 >> 2) & 0xF8; \
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x.c2_r = (x.c2 << 3) & 0xF8;
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#define DECODE_PALETTE_TO_BGR888(x) \
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x.c1_b = palette_map[x.c1 * 4 + 2]; \
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x.c1_g = palette_map[x.c1 * 4 + 1]; \
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x.c1_r = palette_map[x.c1 * 4 + 0]; \
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x.c2_b = palette_map[x.c2 * 4 + 2]; \
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x.c2_g = palette_map[x.c2 * 4 + 1]; \
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x.c2_r = palette_map[x.c2 * 4 + 0];
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struct
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{
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unsigned short c1, c2;
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unsigned char c1_r, c1_g, c1_b;
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unsigned char c2_r, c2_g, c2_b;
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} quad[2][2];
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void AVI_Decode_Video1_16(
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char *encoded,
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int encoded_size,
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char *decoded,
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int width,
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int height,
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int bytes_per_pixel)
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{
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int block_ptr, pixel_ptr;
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int total_blocks;
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int pixel_x, pixel_y; // pixel width and height iterators
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int block_x, block_y; // block width and height iterators
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int blocks_wide, blocks_high; // width and height in 4x4 blocks
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int block_inc;
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int row_dec;
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// decoding parameters
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int stream_ptr;
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unsigned char byte_a, byte_b;
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unsigned short flags;
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int skip_blocks;
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stream_ptr = 0;
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skip_blocks = 0;
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blocks_wide = width / 4;
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blocks_high = height / 4;
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total_blocks = blocks_wide * blocks_high;
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block_inc = 4 * bytes_per_pixel;
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row_dec = (width + 4) * bytes_per_pixel;
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for (block_y = blocks_high; block_y > 0; block_y--)
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{
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block_ptr = ((block_y * 4) - 1) * (width * bytes_per_pixel);
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for (block_x = blocks_wide; block_x > 0; block_x--)
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{
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// check if this block should be skipped
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if (skip_blocks)
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{
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block_ptr += block_inc;
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skip_blocks--;
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total_blocks--;
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continue;
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}
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pixel_ptr = block_ptr;
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// get the next two bytes in the encoded data stream
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byte_a = encoded[stream_ptr++];
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byte_b = encoded[stream_ptr++];
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// check if the decode is finished
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if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0))
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return;
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// check if this is a skip code
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else if ((byte_b & 0xFC) == 0x84)
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{
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// but don't count the current block
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skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
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}
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// check if this is in the 2- or 8-color classes
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else if (byte_b < 0x80)
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{
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flags = (byte_b << 8) | byte_a;
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quad[0][0].c1 = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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quad[0][0].c2 = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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DECODE_BGR555_TO_BGR888(quad[0][0]);
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if (quad[0][0].c1 & 0x8000)
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{
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// 8-color encoding
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quad[1][0].c1 = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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quad[1][0].c2 = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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quad[0][1].c1 = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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quad[0][1].c2 = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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quad[1][1].c1 = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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quad[1][1].c2 = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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DECODE_BGR555_TO_BGR888(quad[0][1]);
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DECODE_BGR555_TO_BGR888(quad[1][0]);
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DECODE_BGR555_TO_BGR888(quad[1][1]);
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for (pixel_y = 0; pixel_y < 4; pixel_y++)
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{
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for (pixel_x = 0; pixel_x < 4; pixel_x++)
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{
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if (flags & 1)
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{
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c1_r;
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c1_g;
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c1_b;
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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else
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{
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c2_r;
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c2_g;
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c2_b;
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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// get the next flag ready to go
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flags >>= 1;
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}
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pixel_ptr -= row_dec;
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}
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}
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else
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{
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// 2-color encoding
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for (pixel_y = 0; pixel_y < 4; pixel_y++)
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{
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for (pixel_x = 0; pixel_x < 4; pixel_x++)
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{
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if (flags & 1)
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{
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decoded[pixel_ptr++] = quad[0][0].c1_r;
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decoded[pixel_ptr++] = quad[0][0].c1_g;
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decoded[pixel_ptr++] = quad[0][0].c1_b;
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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else
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{
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decoded[pixel_ptr++] = quad[0][0].c2_r;
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decoded[pixel_ptr++] = quad[0][0].c2_g;
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decoded[pixel_ptr++] = quad[0][0].c2_b;
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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// get the next flag ready to go
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flags >>= 1;
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}
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pixel_ptr -= row_dec;
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}
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}
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}
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// otherwise, it's a 1-color block
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else
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{
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quad[0][0].c1 = (byte_b << 8) | byte_a;
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DECODE_BGR555_TO_BGR888(quad[0][0]);
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for (pixel_y = 0; pixel_y < 4; pixel_y++)
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{
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for (pixel_x = 0; pixel_x < 4; pixel_x++)
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{
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decoded[pixel_ptr++] = quad[0][0].c1_r;
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decoded[pixel_ptr++] = quad[0][0].c1_g;
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decoded[pixel_ptr++] = quad[0][0].c1_b;
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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pixel_ptr -= row_dec;
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}
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}
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block_ptr += block_inc;
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total_blocks--;
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}
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}
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}
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void AVI_Decode_Video1_8(
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char *encoded,
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int encoded_size,
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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 bytes_per_pixel)
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{
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int block_ptr, pixel_ptr;
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int total_blocks;
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int pixel_x, pixel_y; // pixel width and height iterators
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int block_x, block_y; // block width and height iterators
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int blocks_wide, blocks_high; // width and height in 4x4 blocks
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int block_inc;
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int row_dec;
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// decoding parameters
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int stream_ptr;
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unsigned char byte_a, byte_b;
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unsigned short flags;
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int skip_blocks;
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stream_ptr = 0;
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skip_blocks = 0;
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blocks_wide = width / 4;
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blocks_high = height / 4;
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total_blocks = blocks_wide * blocks_high;
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block_inc = 4 * bytes_per_pixel;
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row_dec = (width + 4) * bytes_per_pixel;
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for (block_y = blocks_high; block_y > 0; block_y--)
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{
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block_ptr = ((block_y * 4) - 1) * (width * bytes_per_pixel);
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for (block_x = blocks_wide; block_x > 0; block_x--)
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{
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// check if this block should be skipped
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if (skip_blocks)
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{
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block_ptr += block_inc;
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skip_blocks--;
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total_blocks--;
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continue;
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}
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pixel_ptr = block_ptr;
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// get the next two bytes in the encoded data stream
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byte_a = encoded[stream_ptr++];
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byte_b = encoded[stream_ptr++];
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// check if the decode is finished
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if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0))
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return;
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// check if this is a skip code
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else if ((byte_b & 0xFC) == 0x84)
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{
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// but don't count the current block
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skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
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}
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// check if this is a 2-color block
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else if (byte_b < 0x80)
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{
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flags = (byte_b << 8) | byte_a;
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quad[0][0].c1 = (unsigned char)encoded[stream_ptr++];
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quad[0][0].c2 = (unsigned char)encoded[stream_ptr++];
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DECODE_PALETTE_TO_BGR888(quad[0][0]);
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// 2-color encoding
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for (pixel_y = 0; pixel_y < 4; pixel_y++)
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{
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for (pixel_x = 0; pixel_x < 4; pixel_x++)
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{
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if (flags & 1)
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{
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decoded[pixel_ptr++] = quad[0][0].c1_r;
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decoded[pixel_ptr++] = quad[0][0].c1_g;
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decoded[pixel_ptr++] = quad[0][0].c1_b;
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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else
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{
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decoded[pixel_ptr++] = quad[0][0].c2_r;
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decoded[pixel_ptr++] = quad[0][0].c2_g;
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decoded[pixel_ptr++] = quad[0][0].c2_b;
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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// get the next flag ready to go
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flags >>= 1;
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}
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pixel_ptr -= row_dec;
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}
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}
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// check if it's an 8-color block
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else if (byte_b >= 0x90)
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{
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flags = (byte_b << 8) | byte_a;
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quad[0][0].c1 = (unsigned char)encoded[stream_ptr++];
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quad[0][0].c2 = (unsigned char)encoded[stream_ptr++];
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quad[1][0].c1 = (unsigned char)encoded[stream_ptr++];
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quad[1][0].c2 = (unsigned char)encoded[stream_ptr++];
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quad[0][1].c1 = (unsigned char)encoded[stream_ptr++];
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quad[0][1].c2 = (unsigned char)encoded[stream_ptr++];
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quad[1][1].c1 = (unsigned char)encoded[stream_ptr++];
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quad[1][1].c2 = (unsigned char)encoded[stream_ptr++];
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DECODE_PALETTE_TO_BGR888(quad[0][0]);
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DECODE_PALETTE_TO_BGR888(quad[0][1]);
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DECODE_PALETTE_TO_BGR888(quad[1][0]);
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DECODE_PALETTE_TO_BGR888(quad[1][1]);
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for (pixel_y = 0; pixel_y < 4; pixel_y++)
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{
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for (pixel_x = 0; pixel_x < 4; pixel_x++)
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{
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if (flags & 1)
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{
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c1_r;
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c1_g;
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c1_b;
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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else
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{
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c2_r;
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c2_g;
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decoded[pixel_ptr++] = quad[pixel_x >> 1][pixel_y >> 1].c2_b;
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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// get the next flag ready to go
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flags >>= 1;
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}
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pixel_ptr -= row_dec;
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}
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}
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// otherwise, it's a 1-color block
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else
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{
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// init c2 along with c1 just so c2 is a known value for macro
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quad[0][0].c1 = quad[0][0].c2 = byte_a;
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DECODE_PALETTE_TO_BGR888(quad[0][0]);
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for (pixel_y = 0; pixel_y < 4; pixel_y++)
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{
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for (pixel_x = 0; pixel_x < 4; pixel_x++)
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{
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decoded[pixel_ptr++] = quad[0][0].c1_r;
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decoded[pixel_ptr++] = quad[0][0].c1_g;
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decoded[pixel_ptr++] = quad[0][0].c1_b;
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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pixel_ptr -= row_dec;
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}
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}
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block_ptr += block_inc;
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total_blocks--;
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}
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}
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}
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