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author | Kostya Shishkov <kostya.shishkov@gmail.com> | 2006-04-07 20:59:57 +0400 |
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committer | Kostya Shishkov <kostya.shishkov@gmail.com> | 2006-04-07 20:59:57 +0400 |
commit | fd7b1991999d0dca96ee8fbd2f6a5f218accc6ae (patch) | |
tree | 308799f65af772c14962d2955283bc62ba917f05 /libavcodec/kmvc.c | |
parent | a01e08ee5c1bff665133885fb680472ab0702a12 (diff) |
KMVC (used in Worms games) decoder. Works fine with samples from MPHQ
Originally committed as revision 5273 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/kmvc.c')
-rw-r--r-- | libavcodec/kmvc.c | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/libavcodec/kmvc.c b/libavcodec/kmvc.c new file mode 100644 index 0000000000..333c909aa8 --- /dev/null +++ b/libavcodec/kmvc.c @@ -0,0 +1,394 @@ +/* + * KMVC decoder + * Copyright (c) 2006 Konstantin Shishkov + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +/** + * @file kmvc.c + * Karl Morton's Video Codec decoder + */ + +#include <stdio.h> +#include <stdlib.h> + +#include "common.h" +#include "avcodec.h" + +#define KMVC_KEYFRAME 0x80 +#define KMVC_PALETTE 0x40 +#define KMVC_METHOD 0x0F + +/* + * Decoder context + */ +typedef struct KmvcContext { + AVCodecContext *avctx; + AVFrame pic; + + int setpal; + int palsize; + uint32_t pal[256]; + uint8_t *cur, *prev; + uint8_t *frm0, *frm1; +} KmvcContext; + +typedef struct BitBuf { + int bits; + int bitbuf; +} BitBuf; + +#define BLK(data, x, y) data[(x) + (y) * 320] + +#define kmvc_init_getbits(bb, src) bb.bits = 7; bb.bitbuf = *src++; + +#define kmvc_getbit(bb, src, res) {\ + res = 0; \ + if (bb.bitbuf & (1 << bb.bits)) res = 1; \ + bb.bits--; \ + if(bb.bits == -1) { \ + bb.bitbuf = *src++; \ + bb.bits = 7; \ + } \ +} + +static void kmvc_decode_intra_8x8(KmvcContext * ctx, uint8_t * src, int w, int h) +{ + BitBuf bb; + int res, val; + int i, j; + int bx, by; + int l0x, l1x, l0y, l1y; + int mx, my; + + kmvc_init_getbits(bb, src); + + for (by = 0; by < h; by += 8) + for (bx = 0; bx < w; bx += 8) { + kmvc_getbit(bb, src, res); + if (!res) { // fill whole 8x8 block + val = *src++; + for (i = 0; i < 64; i++) + BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = val; + } else { // handle four 4x4 subblocks + for (i = 0; i < 4; i++) { + l0x = bx + (i & 1) * 4; + l0y = by + (i & 2) * 2; + kmvc_getbit(bb, src, res); + if (!res) { + kmvc_getbit(bb, src, res); + if (!res) { // fill whole 4x4 block + val = *src++; + for (j = 0; j < 16; j++) + BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = val; + } else { // copy block from already decoded place + val = *src++; + mx = val & 0xF; + my = val >> 4; + for (j = 0; j < 16; j++) + BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = + BLK(ctx->cur, l0x + (j & 3) - mx, l0y + (j >> 2) - my); + } + } else { // descend to 2x2 sub-sub-blocks + for (j = 0; j < 4; j++) { + l1x = l0x + (j & 1) * 2; + l1y = l0y + (j & 2); + kmvc_getbit(bb, src, res); + if (!res) { + kmvc_getbit(bb, src, res); + if (!res) { // fill whole 2x2 block + val = *src++; + BLK(ctx->cur, l1x, l1y) = val; + BLK(ctx->cur, l1x + 1, l1y) = val; + BLK(ctx->cur, l1x, l1y + 1) = val; + BLK(ctx->cur, l1x + 1, l1y + 1) = val; + } else { // copy block from already decoded place + val = *src++; + mx = val & 0xF; + my = val >> 4; + BLK(ctx->cur, l1x, l1y) = BLK(ctx->cur, l1x - mx, l1y - my); + BLK(ctx->cur, l1x + 1, l1y) = + BLK(ctx->cur, l1x + 1 - mx, l1y - my); + BLK(ctx->cur, l1x, l1y + 1) = + BLK(ctx->cur, l1x - mx, l1y + 1 - my); + BLK(ctx->cur, l1x + 1, l1y + 1) = + BLK(ctx->cur, l1x + 1 - mx, l1y + 1 - my); + } + } else { // read values for block + BLK(ctx->cur, l1x, l1y) = *src++; + BLK(ctx->cur, l1x + 1, l1y) = *src++; + BLK(ctx->cur, l1x, l1y + 1) = *src++; + BLK(ctx->cur, l1x + 1, l1y + 1) = *src++; + } + } + } + } + } + } +} + +static void kmvc_decode_inter_8x8(KmvcContext * ctx, uint8_t * src, int w, int h) +{ + BitBuf bb; + int res, val; + int i, j; + int bx, by; + int l0x, l1x, l0y, l1y; + int mx, my; + + kmvc_init_getbits(bb, src); + + for (by = 0; by < h; by += 8) + for (bx = 0; bx < w; bx += 8) { + kmvc_getbit(bb, src, res); + if (!res) { + kmvc_getbit(bb, src, res); + if (!res) { // fill whole 8x8 block + val = *src++; + for (i = 0; i < 64; i++) + BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = val; + } else { // copy block from previous frame + for (i = 0; i < 64; i++) + BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = + BLK(ctx->prev, bx + (i & 0x7), by + (i >> 3)); + } + } else { // handle four 4x4 subblocks + for (i = 0; i < 4; i++) { + l0x = bx + (i & 1) * 4; + l0y = by + (i & 2) * 2; + kmvc_getbit(bb, src, res); + if (!res) { + kmvc_getbit(bb, src, res); + if (!res) { // fill whole 4x4 block + val = *src++; + for (j = 0; j < 16; j++) + BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = val; + } else { // copy block + val = *src++; + mx = (val & 0xF) - 8; + my = (val >> 4) - 8; + for (j = 0; j < 16; j++) + BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = + BLK(ctx->prev, l0x + (j & 3) + mx, l0y + (j >> 2) + my); + } + } else { // descend to 2x2 sub-sub-blocks + for (j = 0; j < 4; j++) { + l1x = l0x + (j & 1) * 2; + l1y = l0y + (j & 2); + kmvc_getbit(bb, src, res); + if (!res) { + kmvc_getbit(bb, src, res); + if (!res) { // fill whole 2x2 block + val = *src++; + BLK(ctx->cur, l1x, l1y) = val; + BLK(ctx->cur, l1x + 1, l1y) = val; + BLK(ctx->cur, l1x, l1y + 1) = val; + BLK(ctx->cur, l1x + 1, l1y + 1) = val; + } else { // copy block + val = *src++; + mx = (val & 0xF) - 8; + my = (val >> 4) - 8; + BLK(ctx->cur, l1x, l1y) = BLK(ctx->prev, l1x + mx, l1y + my); + BLK(ctx->cur, l1x + 1, l1y) = + BLK(ctx->prev, l1x + 1 + mx, l1y + my); + BLK(ctx->cur, l1x, l1y + 1) = + BLK(ctx->prev, l1x + mx, l1y + 1 + my); + BLK(ctx->cur, l1x + 1, l1y + 1) = + BLK(ctx->prev, l1x + 1 + mx, l1y + 1 + my); + } + } else { // read values for block + BLK(ctx->cur, l1x, l1y) = *src++; + BLK(ctx->cur, l1x + 1, l1y) = *src++; + BLK(ctx->cur, l1x, l1y + 1) = *src++; + BLK(ctx->cur, l1x + 1, l1y + 1) = *src++; + } + } + } + } + } + } +} + +static int decode_frame(AVCodecContext * avctx, void *data, int *data_size, uint8_t * buf, + int buf_size) +{ + KmvcContext *const ctx = (KmvcContext *) avctx->priv_data; + uint8_t *out, *src; + int i; + int header; + int blocksize; + + if (ctx->pic.data[0]) + avctx->release_buffer(avctx, &ctx->pic); + + ctx->pic.reference = 1; + ctx->pic.buffer_hints = FF_BUFFER_HINTS_VALID; + if (avctx->get_buffer(avctx, &ctx->pic) < 0) { + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return -1; + } + + header = buf[0]; + buf++; + + if (header & KMVC_KEYFRAME) { + ctx->pic.key_frame = 1; + ctx->pic.pict_type = FF_I_TYPE; + } else { + ctx->pic.key_frame = 0; + ctx->pic.pict_type = FF_P_TYPE; + } + + if (header & KMVC_PALETTE) { + ctx->pic.palette_has_changed = 1; + // palette starts from index 1 and has 127 entries + for (i = 1; i <= ctx->palsize; i++) { + ctx->pal[i] = (buf[0] << 16) | (buf[1] << 8) | buf[2]; + buf += 3; + } + } + + if (ctx->setpal) { + ctx->setpal = 0; + ctx->pic.palette_has_changed = 1; + } + + /* make the palette available on the way out */ + memcpy(ctx->pic.data[1], ctx->pal, 1024); + + blocksize = *buf++; + + if (blocksize != 8) { + av_log(avctx, AV_LOG_ERROR, "Block size = %i\n", blocksize); + return -1; + } + memset(ctx->cur, 0, 320 * 200); + switch (header & KMVC_METHOD) { + case 3: + kmvc_decode_intra_8x8(ctx, buf, avctx->width, avctx->height); + break; + case 4: + kmvc_decode_inter_8x8(ctx, buf, avctx->width, avctx->height); + break; + default: + av_log(avctx, AV_LOG_ERROR, "Unknown compression method %i\n", header & KMVC_METHOD); + return -1; + } + + out = ctx->pic.data[0]; + src = ctx->cur; + for (i = 0; i < avctx->height; i++) { + memcpy(out, src, avctx->width); + src += 320; + out += ctx->pic.linesize[0]; + } + + /* flip buffers */ + if (ctx->cur == ctx->frm0) { + ctx->cur = ctx->frm1; + ctx->prev = ctx->frm0; + } else { + ctx->cur = ctx->frm0; + ctx->prev = ctx->frm1; + } + + *data_size = sizeof(AVFrame); + *(AVFrame *) data = ctx->pic; + + /* always report that the buffer was completely consumed */ + return buf_size; +} + + + +/* + * Init kmvc decoder + */ +static int decode_init(AVCodecContext * avctx) +{ + KmvcContext *const c = (KmvcContext *) avctx->priv_data; + int i; + + c->avctx = avctx; + avctx->has_b_frames = 0; + + c->pic.data[0] = NULL; + + if (avctx->width > 320 || avctx->height > 200) { + av_log(avctx, AV_LOG_ERROR, "KMVC supports frames <= 320x200\n"); + return -1; + } + + c->frm0 = av_mallocz(320 * 200); + c->frm1 = av_mallocz(320 * 200); + c->cur = c->frm0; + c->prev = c->frm1; + + for (i = 0; i < 256; i++) { + c->pal[i] = i * 0x10101; + } + + if (avctx->extradata_size < 12) { + av_log(NULL, 0, "Extradata missing, decoding may not work properly...\n"); + c->palsize = 127; + } else { + c->palsize = LE_16(avctx->extradata + 10); + } + + if (avctx->extradata_size == 1036) { // palette in extradata + uint8_t *src = avctx->extradata + 12; + for (i = 0; i < c->palsize; i++) { + c->pal[i] = LE_32(src); + src += 4; + } + c->setpal = 1; + } + + avctx->pix_fmt = PIX_FMT_PAL8; + + return 0; +} + + + +/* + * Uninit kmvc decoder + */ +static int decode_end(AVCodecContext * avctx) +{ + KmvcContext *const c = (KmvcContext *) avctx->priv_data; + + if (c->frm0) + av_free(c->frm0); + if (c->frm1) + av_free(c->frm1); + if (c->pic.data[0]) + avctx->release_buffer(avctx, &c->pic); + + return 0; +} + +AVCodec kmvc_decoder = { + "kmvc", + CODEC_TYPE_VIDEO, + CODEC_ID_KMVC, + sizeof(KmvcContext), + decode_init, + NULL, + decode_end, + decode_frame +}; |