| /* |
| * 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 Video decoder |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include "libavutil/common.h" |
| #include "libavutil/intreadwrite.h" |
| #include "bytestream.h" |
| #include "avcodec.h" |
| #include "internal.h" |
| |
| #include <zlib.h> |
| |
| /* |
| * Decoder context |
| */ |
| typedef struct DxaDecContext { |
| AVFrame *prev; |
| |
| int dsize; |
| #define DECOMP_BUF_PADDING 16 |
| 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, |
| int stride, uint8_t *src, int srcsize, uint8_t *ref) |
| { |
| uint8_t *code, *data, *mv, *msk, *tmp, *tmp2; |
| uint8_t *src_end = src + srcsize; |
| int i, j, k; |
| int type, x, y, d, d2; |
| uint32_t mask; |
| |
| if (12ULL + ((avctx->width * avctx->height) >> 4) + AV_RB32(src + 0) + AV_RB32(src + 4) > srcsize) |
| return AVERROR_INVALIDDATA; |
| |
| 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){ |
| if (data > src_end || mv > src_end || msk > src_end) |
| return AVERROR_INVALIDDATA; |
| 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; |
| if (i < -x || avctx->width - i - 4 < x || |
| j < -y || avctx->height - j - 4 < y) { |
| av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y); |
| return AVERROR_INVALIDDATA; |
| } |
| 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; |
| if (i + 2*(k & 1) < -x || avctx->width - i - 2*(k & 1) - 2 < x || |
| j + (k & 2) < -y || avctx->height - j - (k & 2) - 2 < y) { |
| av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y); |
| return AVERROR_INVALIDDATA; |
| } |
| 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 AVERROR_INVALIDDATA; |
| } |
| } |
| dst += stride * 4; |
| ref += stride * 4; |
| } |
| return 0; |
| } |
| |
| static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) |
| { |
| AVFrame *frame = data; |
| DxaDecContext * const c = avctx->priv_data; |
| uint8_t *outptr, *srcptr, *tmpptr; |
| unsigned long dsize; |
| int i, j, compr, ret; |
| int stride; |
| int pc = 0; |
| GetByteContext gb; |
| |
| bytestream2_init(&gb, avpkt->data, avpkt->size); |
| |
| /* make the palette available on the way out */ |
| if (bytestream2_peek_le32(&gb) == MKTAG('C','M','A','P')) { |
| bytestream2_skip(&gb, 4); |
| for(i = 0; i < 256; i++){ |
| c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&gb); |
| } |
| pc = 1; |
| } |
| |
| if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
| return ret; |
| memcpy(frame->data[1], c->pal, AVPALETTE_SIZE); |
| frame->palette_has_changed = pc; |
| |
| outptr = frame->data[0]; |
| srcptr = c->decomp_buf; |
| tmpptr = c->prev->data[0]; |
| stride = frame->linesize[0]; |
| |
| if (bytestream2_get_le32(&gb) == MKTAG('N','U','L','L')) |
| compr = -1; |
| else |
| compr = bytestream2_get_byte(&gb); |
| |
| dsize = c->dsize; |
| if (compr != 4 && compr != -1) { |
| bytestream2_skip(&gb, 4); |
| if (uncompress(c->decomp_buf, &dsize, avpkt->data + bytestream2_tell(&gb), |
| bytestream2_get_bytes_left(&gb)) != Z_OK) { |
| av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n"); |
| return AVERROR_UNKNOWN; |
| } |
| memset(c->decomp_buf + dsize, 0, DECOMP_BUF_PADDING); |
| } |
| |
| if (avctx->debug & FF_DEBUG_PICT_INFO) |
| av_log(avctx, AV_LOG_DEBUG, "compr:%2d, dsize:%d\n", compr, (int)dsize); |
| |
| switch(compr){ |
| case -1: |
| frame->key_frame = 0; |
| frame->pict_type = AV_PICTURE_TYPE_P; |
| if (c->prev->data[0]) |
| memcpy(frame->data[0], c->prev->data[0], frame->linesize[0] * avctx->height); |
| else{ // Should happen only when first frame is 'NULL' |
| memset(frame->data[0], 0, frame->linesize[0] * avctx->height); |
| frame->key_frame = 1; |
| frame->pict_type = AV_PICTURE_TYPE_I; |
| } |
| break; |
| case 2: |
| case 4: |
| frame->key_frame = 1; |
| frame->pict_type = AV_PICTURE_TYPE_I; |
| for (j = 0; j < avctx->height; j++) { |
| memcpy(outptr, srcptr, avctx->width); |
| outptr += stride; |
| srcptr += avctx->width; |
| } |
| break; |
| case 3: |
| case 5: |
| if (!tmpptr) { |
| av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n"); |
| if (!(avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL)) |
| return AVERROR_INVALIDDATA; |
| } |
| frame->key_frame = 0; |
| frame->pict_type = AV_PICTURE_TYPE_P; |
| for (j = 0; j < avctx->height; j++) { |
| if(tmpptr){ |
| 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: |
| frame->key_frame = 0; |
| frame->pict_type = AV_PICTURE_TYPE_P; |
| if (!c->prev->data[0]) { |
| av_log(avctx, AV_LOG_ERROR, "Missing reference frame\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| decode_13(avctx, c, frame->data[0], frame->linesize[0], srcptr, dsize, c->prev->data[0]); |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", compr); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| av_frame_unref(c->prev); |
| if ((ret = av_frame_ref(c->prev, frame)) < 0) |
| return ret; |
| |
| *got_frame = 1; |
| |
| /* always report that the buffer was completely consumed */ |
| return avpkt->size; |
| } |
| |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| DxaDecContext * const c = avctx->priv_data; |
| |
| if (avctx->width%4 || avctx->height%4) { |
| avpriv_request_sample(avctx, "dimensions are not a multiple of 4"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| c->prev = av_frame_alloc(); |
| if (!c->prev) |
| return AVERROR(ENOMEM); |
| |
| avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| |
| c->dsize = avctx->width * avctx->height * 2; |
| c->decomp_buf = av_malloc(c->dsize + DECOMP_BUF_PADDING); |
| if (!c->decomp_buf) { |
| av_frame_free(&c->prev); |
| av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); |
| return AVERROR(ENOMEM); |
| } |
| |
| return 0; |
| } |
| |
| static av_cold int decode_end(AVCodecContext *avctx) |
| { |
| DxaDecContext * const c = avctx->priv_data; |
| |
| av_freep(&c->decomp_buf); |
| av_frame_free(&c->prev); |
| |
| return 0; |
| } |
| |
| AVCodec ff_dxa_decoder = { |
| .name = "dxa", |
| .long_name = NULL_IF_CONFIG_SMALL("Feeble Files/ScummVM DXA"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_DXA, |
| .priv_data_size = sizeof(DxaDecContext), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
