From 33a0dd378abd98647700a296e5869146de74ed1c Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Wed, 14 Mar 2007 14:49:49 +0000 Subject: DXA demuxer and decoder Originally committed as revision 8405 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/dxa.c | 333 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 333 insertions(+) create mode 100644 libavcodec/dxa.c (limited to 'libavcodec/dxa.c') diff --git a/libavcodec/dxa.c b/libavcodec/dxa.c new file mode 100644 index 0000000000..fc201ccb4a --- /dev/null +++ b/libavcodec/dxa.c @@ -0,0 +1,333 @@ +/* + * Feeble Files/ScummVM DXA decoder + * Copyright (c) 2007 Konstantin Shishkov + * + * This file is part of FFmpeg. + * + * FFmpeg 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 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +/** + * @file dxa.c + * DXA Video decoder + */ + +#include +#include + +#include "common.h" +#include "avcodec.h" + +#include + +/* + * Decoder context + */ +typedef struct DxaDecContext { + AVCodecContext *avctx; + AVFrame pic, prev; + + int dsize; + uint8_t *decomp_buf; + uint32_t pal[256]; +} DxaDecContext; + +static const int shift1[6] = { 0, 8, 8, 8, 4, 4 }; +static const int shift2[6] = { 0, 0, 8, 4, 0, 4 }; + +static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst, uint8_t *src, uint8_t *ref) +{ + uint8_t *code, *data, *mv, *msk, *tmp, *tmp2; + int i, j, k; + int type, x, y, d, d2; + int stride = c->pic.linesize[0]; + uint32_t mask; + + code = src + 12; + data = code + ((avctx->width * avctx->height) >> 4); + mv = data + AV_RB32(src + 0); + msk = mv + AV_RB32(src + 4); + + for(j = 0; j < avctx->height; j += 4){ + for(i = 0; i < avctx->width; i += 4){ + tmp = dst + i; + tmp2 = ref + i; + type = *code++; + switch(type){ + case 4: // motion compensation + x = (*mv) >> 4; if(x & 8) x = 8 - x; + y = (*mv++) & 0xF; if(y & 8) y = 8 - y; + tmp2 += x + y*stride; + case 0: // skip + case 5: // skip in method 12 + for(y = 0; y < 4; y++){ + memcpy(tmp, tmp2, 4); + tmp += stride; + tmp2 += stride; + } + break; + case 1: // masked change + case 10: // masked change with only half of pixels changed + case 11: // cases 10-15 are for method 12 only + case 12: + case 13: + case 14: + case 15: + if(type == 1){ + mask = AV_RB16(msk); + msk += 2; + }else{ + type -= 10; + mask = ((msk[0] & 0xF0) << shift1[type]) | ((msk[0] & 0xF) << shift2[type]); + msk++; + } + for(y = 0; y < 4; y++){ + for(x = 0; x < 4; x++){ + tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x]; + mask <<= 1; + } + tmp += stride; + tmp2 += stride; + } + break; + case 2: // fill block + for(y = 0; y < 4; y++){ + memset(tmp, data[0], 4); + tmp += stride; + } + data++; + break; + case 3: // raw block + for(y = 0; y < 4; y++){ + memcpy(tmp, data, 4); + data += 4; + tmp += stride; + } + break; + case 8: // subblocks - method 13 only + mask = *msk++; + for(k = 0; k < 4; k++){ + d = ((k & 1) << 1) + ((k & 2) * stride); + d2 = ((k & 1) << 1) + ((k & 2) * stride); + tmp2 = ref + i + d2; + switch(mask & 0xC0){ + case 0x80: // motion compensation + x = (*mv) >> 4; if(x & 8) x = 8 - x; + y = (*mv++) & 0xF; if(y & 8) y = 8 - y; + tmp2 += x + y*stride; + case 0x00: // skip + tmp[d + 0 ] = tmp2[0]; + tmp[d + 1 ] = tmp2[1]; + tmp[d + 0 + stride] = tmp2[0 + stride]; + tmp[d + 1 + stride] = tmp2[1 + stride]; + break; + case 0x40: // fill + tmp[d + 0 ] = data[0]; + tmp[d + 1 ] = data[0]; + tmp[d + 0 + stride] = data[0]; + tmp[d + 1 + stride] = data[0]; + data++; + break; + case 0xC0: // raw + tmp[d + 0 ] = *data++; + tmp[d + 1 ] = *data++; + tmp[d + 0 + stride] = *data++; + tmp[d + 1 + stride] = *data++; + break; + } + mask <<= 2; + } + break; + case 32: // vector quantization - 2 colors + mask = AV_RB16(msk); + msk += 2; + for(y = 0; y < 4; y++){ + for(x = 0; x < 4; x++){ + tmp[x] = data[mask & 1]; + mask >>= 1; + } + tmp += stride; + tmp2 += stride; + } + data += 2; + break; + case 33: // vector quantization - 3 or 4 colors + case 34: + mask = AV_RB32(msk); + msk += 4; + for(y = 0; y < 4; y++){ + for(x = 0; x < 4; x++){ + tmp[x] = data[mask & 3]; + mask >>= 2; + } + tmp += stride; + tmp2 += stride; + } + data += type - 30; + break; + default: + av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type); + return -1; + } + } + dst += stride * 4; + ref += stride * 4; + } + return 0; +} + +static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) +{ + DxaDecContext * const c = (DxaDecContext *)avctx->priv_data; + uint8_t *outptr, *srcptr, *tmpptr; + unsigned long dsize; + int i, j, compr; + int stride; + int orig_buf_size = buf_size; + int pc = 0; + + /* make the palette available on the way out */ + if(buf[0]=='C' && buf[1]=='M' && buf[2]=='A' && buf[3]=='P'){ + int r, g, b; + + buf += 4; + for(i = 0; i < 256; i++){ + r = *buf++; + g = *buf++; + b = *buf++; + c->pal[i] = (r << 16) | (g << 8) | b; + } + pc = 1; + buf_size -= 768+4; + } + + if(avctx->get_buffer(avctx, &c->pic) < 0){ + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return -1; + } + memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE); + c->pic.palette_has_changed = pc; + + outptr = c->pic.data[0]; + srcptr = c->decomp_buf; + tmpptr = c->prev.data[0]; + stride = c->pic.linesize[0]; + + if(buf[0]=='N' && buf[1]=='U' && buf[2]=='L' && buf[3]=='L') + compr = -1; + else + compr = buf[4]; + + dsize = c->dsize; + if((compr != 4 && compr != -1) && uncompress(c->decomp_buf, &dsize, buf + 9, buf_size - 9) != Z_OK){ + av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n"); + return -1; + } + switch(compr){ + case -1: + c->pic.key_frame = 0; + c->pic.pict_type = FF_P_TYPE; + if(c->prev.data[0]) + memcpy(c->pic.data[0], c->prev.data[0], c->pic.linesize[0] * avctx->height); + else{ // Should happen only when first frame is 'NULL' + memset(c->pic.data[0], 0, c->pic.linesize[0] * avctx->height); + c->pic.key_frame = 1; + c->pic.pict_type = FF_I_TYPE; + } + break; + case 2: + case 3: + case 4: + case 5: + c->pic.key_frame = !(compr & 1); + c->pic.pict_type = (compr & 1) ? FF_P_TYPE : FF_I_TYPE; + for(j = 0; j < avctx->height; j++){ + if(compr & 1){ + for(i = 0; i < avctx->width; i++) + outptr[i] = srcptr[i] ^ tmpptr[i]; + tmpptr += stride; + }else + memcpy(outptr, srcptr, avctx->width); + outptr += stride; + srcptr += avctx->width; + } + break; + case 12: // ScummVM coding + case 13: + c->pic.key_frame = 0; + c->pic.pict_type = FF_P_TYPE; + decode_13(avctx, c, c->pic.data[0], srcptr, c->prev.data[0]); + break; + default: + av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", buf[4]); + return -1; + } + + FFSWAP(AVFrame, c->pic, c->prev); + if(c->pic.data[0]) + avctx->release_buffer(avctx, &c->pic); + + *data_size = sizeof(AVFrame); + *(AVFrame*)data = c->prev; + + /* always report that the buffer was completely consumed */ + return orig_buf_size; +} + +static int decode_init(AVCodecContext *avctx) +{ + DxaDecContext * const c = (DxaDecContext *)avctx->priv_data; + + c->avctx = avctx; + avctx->pix_fmt = PIX_FMT_PAL8; + + if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) { + return -1; + } + + c->dsize = avctx->width * avctx->height * 2; + if((c->decomp_buf = av_malloc(c->dsize)) == NULL) { + av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); + return -1; + } + + return 0; +} + +static int decode_end(AVCodecContext *avctx) +{ + DxaDecContext * const c = (DxaDecContext *)avctx->priv_data; + + av_freep(&c->decomp_buf); + if(c->prev.data[0]) + avctx->release_buffer(avctx, &c->prev); + if(c->pic.data[0]) + avctx->release_buffer(avctx, &c->pic); + + return 0; +} + +AVCodec dxa_decoder = { + "dxa", + CODEC_TYPE_VIDEO, + CODEC_ID_DXA, + sizeof(DxaDecContext), + decode_init, + NULL, + decode_end, + decode_frame +}; + -- cgit v1.2.3