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648 lines
22 KiB
648 lines
22 KiB
/* |
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* Westwood Studios VQA Video Decoder |
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* Copyright (C) 2003 the ffmpeg project |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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/** |
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* @file |
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* VQA Video Decoder |
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* @author Mike Melanson (melanson@pcisys.net) |
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* @see http://wiki.multimedia.cx/index.php?title=VQA |
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* |
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* The VQA video decoder outputs PAL8 or RGB555 colorspace data, depending |
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* on the type of data in the file. |
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* |
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* This decoder needs the 42-byte VQHD header from the beginning |
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* of the VQA file passed through the extradata field. The VQHD header |
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* is laid out as: |
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* |
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* bytes 0-3 chunk fourcc: 'VQHD' |
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* bytes 4-7 chunk size in big-endian format, should be 0x0000002A |
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* bytes 8-49 VQHD chunk data |
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* |
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* Bytes 8-49 are what this decoder expects to see. |
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* |
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* Briefly, VQA is a vector quantized animation format that operates in a |
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* VGA palettized colorspace. It operates on pixel vectors (blocks) |
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* of either 4x2 or 4x4 in size. Compressed VQA chunks can contain vector |
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* codebooks, palette information, and code maps for rendering vectors onto |
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* frames. Any of these components can also be compressed with a run-length |
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* encoding (RLE) algorithm commonly referred to as "format80". |
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* |
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* VQA takes a novel approach to rate control. Each group of n frames |
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* (usually, n = 8) relies on a different vector codebook. Rather than |
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* transporting an entire codebook every 8th frame, the new codebook is |
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* broken up into 8 pieces and sent along with the compressed video chunks |
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* for each of the 8 frames preceding the 8 frames which require the |
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* codebook. A full codebook is also sent on the very first frame of a |
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* file. This is an interesting technique, although it makes random file |
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* seeking difficult despite the fact that the frames are all intracoded. |
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* |
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* V1,2 VQA uses 12-bit codebook indexes. If the 12-bit indexes were |
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* packed into bytes and then RLE compressed, bytewise, the results would |
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* be poor. That is why the coding method divides each index into 2 parts, |
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* the top 4 bits and the bottom 8 bits, then RL encodes the 4-bit pieces |
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* together and the 8-bit pieces together. If most of the vectors are |
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* clustered into one group of 256 vectors, most of the 4-bit index pieces |
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* should be the same. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/imgutils.h" |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "internal.h" |
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#define PALETTE_COUNT 256 |
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#define VQA_HEADER_SIZE 0x2A |
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|
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/* allocate the maximum vector space, regardless of the file version: |
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* (0xFF00 codebook vectors + 0x100 solid pixel vectors) * (4x4 pixels/block) */ |
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#define MAX_CODEBOOK_VECTORS 0xFF00 |
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#define SOLID_PIXEL_VECTORS 0x100 |
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#define MAX_VECTORS (MAX_CODEBOOK_VECTORS + SOLID_PIXEL_VECTORS) |
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#define MAX_CODEBOOK_SIZE (MAX_VECTORS * 4 * 4) |
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#define CBF0_TAG MKBETAG('C', 'B', 'F', '0') |
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#define CBFZ_TAG MKBETAG('C', 'B', 'F', 'Z') |
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#define CBP0_TAG MKBETAG('C', 'B', 'P', '0') |
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#define CBPZ_TAG MKBETAG('C', 'B', 'P', 'Z') |
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#define CPL0_TAG MKBETAG('C', 'P', 'L', '0') |
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#define CPLZ_TAG MKBETAG('C', 'P', 'L', 'Z') |
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#define VPTZ_TAG MKBETAG('V', 'P', 'T', 'Z') |
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typedef struct VqaContext { |
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AVCodecContext *avctx; |
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GetByteContext gb; |
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uint32_t palette[PALETTE_COUNT]; |
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int width; /* width of a frame */ |
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int height; /* height of a frame */ |
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int vector_width; /* width of individual vector */ |
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int vector_height; /* height of individual vector */ |
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int vqa_version; /* this should be either 1, 2 or 3 */ |
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unsigned char *codebook; /* the current codebook */ |
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int codebook_size; |
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unsigned char *next_codebook_buffer; /* accumulator for next codebook */ |
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int next_codebook_buffer_index; |
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unsigned char *decode_buffer; |
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int decode_buffer_size; |
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/* number of frames to go before replacing codebook */ |
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int partial_countdown; |
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int partial_count; |
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} VqaContext; |
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static av_cold int vqa_decode_init(AVCodecContext *avctx) |
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{ |
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VqaContext *s = avctx->priv_data; |
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int i, j, codebook_index, ret; |
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s->avctx = avctx; |
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avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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/* make sure the extradata made it */ |
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if (s->avctx->extradata_size != VQA_HEADER_SIZE) { |
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av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n", VQA_HEADER_SIZE); |
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return AVERROR(EINVAL); |
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} |
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/* load up the VQA parameters from the header */ |
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s->vqa_version = s->avctx->extradata[0]; |
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switch (s->vqa_version) { |
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case 1: |
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case 2: |
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break; |
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case 3: |
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avpriv_report_missing_feature(avctx, "VQA Version %d", s->vqa_version); |
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return AVERROR_PATCHWELCOME; |
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default: |
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avpriv_request_sample(avctx, "VQA Version %i", s->vqa_version); |
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return AVERROR_PATCHWELCOME; |
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} |
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s->width = AV_RL16(&s->avctx->extradata[6]); |
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s->height = AV_RL16(&s->avctx->extradata[8]); |
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if ((ret = av_image_check_size(s->width, s->height, 0, avctx)) < 0) { |
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s->width= s->height= 0; |
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return ret; |
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} |
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s->vector_width = s->avctx->extradata[10]; |
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s->vector_height = s->avctx->extradata[11]; |
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s->partial_count = s->partial_countdown = s->avctx->extradata[13]; |
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/* the vector dimensions have to meet very stringent requirements */ |
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if ((s->vector_width != 4) || |
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((s->vector_height != 2) && (s->vector_height != 4))) { |
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/* return without further initialization */ |
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return AVERROR_INVALIDDATA; |
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} |
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if (s->width % s->vector_width || s->height % s->vector_height) { |
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av_log(avctx, AV_LOG_ERROR, "Image size not multiple of block size\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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/* allocate codebooks */ |
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s->codebook_size = MAX_CODEBOOK_SIZE; |
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s->codebook = av_malloc(s->codebook_size); |
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if (!s->codebook) |
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goto fail; |
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s->next_codebook_buffer = av_malloc(s->codebook_size); |
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if (!s->next_codebook_buffer) |
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goto fail; |
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/* allocate decode buffer */ |
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s->decode_buffer_size = (s->width / s->vector_width) * |
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(s->height / s->vector_height) * 2; |
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s->decode_buffer = av_malloc(s->decode_buffer_size); |
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if (!s->decode_buffer) |
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goto fail; |
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/* initialize the solid-color vectors */ |
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if (s->vector_height == 4) { |
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codebook_index = 0xFF00 * 16; |
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for (i = 0; i < 256; i++) |
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for (j = 0; j < 16; j++) |
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s->codebook[codebook_index++] = i; |
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} else { |
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codebook_index = 0xF00 * 8; |
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for (i = 0; i < 256; i++) |
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for (j = 0; j < 8; j++) |
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s->codebook[codebook_index++] = i; |
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} |
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s->next_codebook_buffer_index = 0; |
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return 0; |
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fail: |
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av_freep(&s->codebook); |
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av_freep(&s->next_codebook_buffer); |
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av_freep(&s->decode_buffer); |
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return AVERROR(ENOMEM); |
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} |
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#define CHECK_COUNT() \ |
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if (dest_index + count > dest_size) { \ |
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av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \ |
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av_log(s->avctx, AV_LOG_ERROR, "current dest_index = %d, count = %d, dest_size = %d\n", \ |
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dest_index, count, dest_size); \ |
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return AVERROR_INVALIDDATA; \ |
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} |
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#define CHECK_COPY(idx) \ |
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if (idx < 0 || idx + count > dest_size) { \ |
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av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \ |
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av_log(s->avctx, AV_LOG_ERROR, "current src_pos = %d, count = %d, dest_size = %d\n", \ |
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src_pos, count, dest_size); \ |
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return AVERROR_INVALIDDATA; \ |
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} |
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static int decode_format80(VqaContext *s, int src_size, |
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unsigned char *dest, int dest_size, int check_size) { |
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int dest_index = 0; |
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int count, opcode, start; |
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int src_pos; |
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unsigned char color; |
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int i; |
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start = bytestream2_tell(&s->gb); |
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while (bytestream2_tell(&s->gb) - start < src_size) { |
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opcode = bytestream2_get_byte(&s->gb); |
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av_dlog(s->avctx, "opcode %02X: ", opcode); |
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/* 0x80 means that frame is finished */ |
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if (opcode == 0x80) |
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break; |
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if (dest_index >= dest_size) { |
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av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n", |
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dest_index, dest_size); |
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return AVERROR_INVALIDDATA; |
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} |
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if (opcode == 0xFF) { |
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count = bytestream2_get_le16(&s->gb); |
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src_pos = bytestream2_get_le16(&s->gb); |
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av_dlog(s->avctx, "(1) copy %X bytes from absolute pos %X\n", count, src_pos); |
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CHECK_COUNT(); |
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CHECK_COPY(src_pos); |
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for (i = 0; i < count; i++) |
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dest[dest_index + i] = dest[src_pos + i]; |
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dest_index += count; |
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} else if (opcode == 0xFE) { |
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count = bytestream2_get_le16(&s->gb); |
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color = bytestream2_get_byte(&s->gb); |
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av_dlog(s->avctx, "(2) set %X bytes to %02X\n", count, color); |
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CHECK_COUNT(); |
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memset(&dest[dest_index], color, count); |
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dest_index += count; |
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} else if ((opcode & 0xC0) == 0xC0) { |
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count = (opcode & 0x3F) + 3; |
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src_pos = bytestream2_get_le16(&s->gb); |
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av_dlog(s->avctx, "(3) copy %X bytes from absolute pos %X\n", count, src_pos); |
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CHECK_COUNT(); |
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CHECK_COPY(src_pos); |
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for (i = 0; i < count; i++) |
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dest[dest_index + i] = dest[src_pos + i]; |
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dest_index += count; |
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} else if (opcode > 0x80) { |
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count = opcode & 0x3F; |
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av_dlog(s->avctx, "(4) copy %X bytes from source to dest\n", count); |
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CHECK_COUNT(); |
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bytestream2_get_buffer(&s->gb, &dest[dest_index], count); |
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dest_index += count; |
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} else { |
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count = ((opcode & 0x70) >> 4) + 3; |
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src_pos = bytestream2_get_byte(&s->gb) | ((opcode & 0x0F) << 8); |
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av_dlog(s->avctx, "(5) copy %X bytes from relpos %X\n", count, src_pos); |
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CHECK_COUNT(); |
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CHECK_COPY(dest_index - src_pos); |
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for (i = 0; i < count; i++) |
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dest[dest_index + i] = dest[dest_index - src_pos + i]; |
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dest_index += count; |
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} |
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} |
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/* validate that the entire destination buffer was filled; this is |
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* important for decoding frame maps since each vector needs to have a |
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* codebook entry; it is not important for compressed codebooks because |
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* not every entry needs to be filled */ |
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if (check_size) |
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if (dest_index < dest_size) { |
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av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n", |
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dest_index, dest_size); |
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memset(dest + dest_index, 0, dest_size - dest_index); |
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} |
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return 0; // let's display what we decoded anyway |
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} |
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static int vqa_decode_chunk(VqaContext *s, AVFrame *frame) |
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{ |
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unsigned int chunk_type; |
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unsigned int chunk_size; |
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int byte_skip; |
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unsigned int index = 0; |
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int i; |
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unsigned char r, g, b; |
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int index_shift; |
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int res; |
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int cbf0_chunk = -1; |
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int cbfz_chunk = -1; |
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int cbp0_chunk = -1; |
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int cbpz_chunk = -1; |
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int cpl0_chunk = -1; |
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int cplz_chunk = -1; |
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int vptz_chunk = -1; |
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int x, y; |
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int lines = 0; |
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int pixel_ptr; |
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int vector_index = 0; |
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int lobyte = 0; |
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int hibyte = 0; |
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int lobytes = 0; |
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int hibytes = s->decode_buffer_size / 2; |
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/* first, traverse through the frame and find the subchunks */ |
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while (bytestream2_get_bytes_left(&s->gb) >= 8) { |
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chunk_type = bytestream2_get_be32u(&s->gb); |
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index = bytestream2_tell(&s->gb); |
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chunk_size = bytestream2_get_be32u(&s->gb); |
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switch (chunk_type) { |
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case CBF0_TAG: |
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cbf0_chunk = index; |
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break; |
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case CBFZ_TAG: |
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cbfz_chunk = index; |
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break; |
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case CBP0_TAG: |
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cbp0_chunk = index; |
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break; |
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case CBPZ_TAG: |
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cbpz_chunk = index; |
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break; |
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case CPL0_TAG: |
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cpl0_chunk = index; |
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break; |
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case CPLZ_TAG: |
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cplz_chunk = index; |
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break; |
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case VPTZ_TAG: |
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vptz_chunk = index; |
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break; |
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default: |
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av_log(s->avctx, AV_LOG_ERROR, "Found unknown chunk type: %c%c%c%c (%08X)\n", |
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(chunk_type >> 24) & 0xFF, |
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(chunk_type >> 16) & 0xFF, |
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(chunk_type >> 8) & 0xFF, |
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(chunk_type >> 0) & 0xFF, |
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chunk_type); |
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break; |
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} |
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byte_skip = chunk_size & 0x01; |
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bytestream2_skip(&s->gb, chunk_size + byte_skip); |
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} |
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/* next, deal with the palette */ |
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if ((cpl0_chunk != -1) && (cplz_chunk != -1)) { |
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/* a chunk should not have both chunk types */ |
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av_log(s->avctx, AV_LOG_ERROR, "problem: found both CPL0 and CPLZ chunks\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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/* decompress the palette chunk */ |
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if (cplz_chunk != -1) { |
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/* yet to be handled */ |
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} |
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/* convert the RGB palette into the machine's endian format */ |
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if (cpl0_chunk != -1) { |
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bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET); |
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chunk_size = bytestream2_get_be32(&s->gb); |
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/* sanity check the palette size */ |
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if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) { |
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av_log(s->avctx, AV_LOG_ERROR, "problem: found a palette chunk with %d colors\n", |
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chunk_size / 3); |
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return AVERROR_INVALIDDATA; |
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} |
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for (i = 0; i < chunk_size / 3; i++) { |
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/* scale by 4 to transform 6-bit palette -> 8-bit */ |
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r = bytestream2_get_byteu(&s->gb) * 4; |
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g = bytestream2_get_byteu(&s->gb) * 4; |
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b = bytestream2_get_byteu(&s->gb) * 4; |
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s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b; |
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s->palette[i] |= s->palette[i] >> 6 & 0x30303; |
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} |
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} |
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/* next, look for a full codebook */ |
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if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) { |
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/* a chunk should not have both chunk types */ |
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av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBF0 and CBFZ chunks\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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/* decompress the full codebook chunk */ |
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if (cbfz_chunk != -1) { |
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bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET); |
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chunk_size = bytestream2_get_be32(&s->gb); |
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if ((res = decode_format80(s, chunk_size, s->codebook, |
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s->codebook_size, 0)) < 0) |
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return res; |
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} |
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/* copy a full codebook */ |
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if (cbf0_chunk != -1) { |
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bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET); |
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chunk_size = bytestream2_get_be32(&s->gb); |
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/* sanity check the full codebook size */ |
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if (chunk_size > MAX_CODEBOOK_SIZE) { |
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av_log(s->avctx, AV_LOG_ERROR, "problem: CBF0 chunk too large (0x%X bytes)\n", |
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chunk_size); |
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return AVERROR_INVALIDDATA; |
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} |
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bytestream2_get_buffer(&s->gb, s->codebook, chunk_size); |
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} |
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/* decode the frame */ |
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if (vptz_chunk == -1) { |
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/* something is wrong if there is no VPTZ chunk */ |
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av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET); |
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chunk_size = bytestream2_get_be32(&s->gb); |
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if ((res = decode_format80(s, chunk_size, |
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s->decode_buffer, s->decode_buffer_size, 1)) < 0) |
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return res; |
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|
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/* render the final PAL8 frame */ |
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if (s->vector_height == 4) |
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index_shift = 4; |
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else |
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index_shift = 3; |
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for (y = 0; y < s->height; y += s->vector_height) { |
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for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) { |
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pixel_ptr = y * frame->linesize[0] + x; |
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|
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/* get the vector index, the method for which varies according to |
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* VQA file version */ |
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switch (s->vqa_version) { |
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|
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case 1: |
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lobyte = s->decode_buffer[lobytes * 2]; |
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hibyte = s->decode_buffer[(lobytes * 2) + 1]; |
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vector_index = ((hibyte << 8) | lobyte) >> 3; |
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vector_index <<= index_shift; |
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lines = s->vector_height; |
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/* uniform color fill - a quick hack */ |
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if (hibyte == 0xFF) { |
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while (lines--) { |
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frame->data[0][pixel_ptr + 0] = 255 - lobyte; |
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frame->data[0][pixel_ptr + 1] = 255 - lobyte; |
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frame->data[0][pixel_ptr + 2] = 255 - lobyte; |
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frame->data[0][pixel_ptr + 3] = 255 - lobyte; |
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pixel_ptr += frame->linesize[0]; |
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} |
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lines=0; |
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} |
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break; |
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case 2: |
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lobyte = s->decode_buffer[lobytes]; |
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hibyte = s->decode_buffer[hibytes]; |
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vector_index = (hibyte << 8) | lobyte; |
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vector_index <<= index_shift; |
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lines = s->vector_height; |
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break; |
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|
|
case 3: |
|
/* not implemented yet */ |
|
lines = 0; |
|
break; |
|
} |
|
|
|
while (lines--) { |
|
frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++]; |
|
frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++]; |
|
frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++]; |
|
frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++]; |
|
pixel_ptr += frame->linesize[0]; |
|
} |
|
} |
|
} |
|
|
|
/* handle partial codebook */ |
|
if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) { |
|
/* a chunk should not have both chunk types */ |
|
av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBP0 and CBPZ chunks\n"); |
|
return AVERROR_INVALIDDATA; |
|
} |
|
|
|
if (cbp0_chunk != -1) { |
|
|
|
bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET); |
|
chunk_size = bytestream2_get_be32(&s->gb); |
|
|
|
if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) { |
|
av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (%u bytes)\n", |
|
chunk_size); |
|
return AVERROR_INVALIDDATA; |
|
} |
|
|
|
/* accumulate partial codebook */ |
|
bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index], |
|
chunk_size); |
|
s->next_codebook_buffer_index += chunk_size; |
|
|
|
s->partial_countdown--; |
|
if (s->partial_countdown <= 0) { |
|
|
|
/* time to replace codebook */ |
|
memcpy(s->codebook, s->next_codebook_buffer, |
|
s->next_codebook_buffer_index); |
|
|
|
/* reset accounting */ |
|
s->next_codebook_buffer_index = 0; |
|
s->partial_countdown = s->partial_count; |
|
} |
|
} |
|
|
|
if (cbpz_chunk != -1) { |
|
|
|
bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET); |
|
chunk_size = bytestream2_get_be32(&s->gb); |
|
|
|
if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) { |
|
av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (%u bytes)\n", |
|
chunk_size); |
|
return AVERROR_INVALIDDATA; |
|
} |
|
|
|
/* accumulate partial codebook */ |
|
bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index], |
|
chunk_size); |
|
s->next_codebook_buffer_index += chunk_size; |
|
|
|
s->partial_countdown--; |
|
if (s->partial_countdown <= 0) { |
|
bytestream2_init(&s->gb, s->next_codebook_buffer, s->next_codebook_buffer_index); |
|
/* decompress codebook */ |
|
if ((res = decode_format80(s, s->next_codebook_buffer_index, |
|
s->codebook, s->codebook_size, 0)) < 0) |
|
return res; |
|
|
|
/* reset accounting */ |
|
s->next_codebook_buffer_index = 0; |
|
s->partial_countdown = s->partial_count; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int vqa_decode_frame(AVCodecContext *avctx, |
|
void *data, int *got_frame, |
|
AVPacket *avpkt) |
|
{ |
|
VqaContext *s = avctx->priv_data; |
|
AVFrame *frame = data; |
|
int res; |
|
|
|
if ((res = ff_get_buffer(avctx, frame, 0)) < 0) |
|
return res; |
|
|
|
bytestream2_init(&s->gb, avpkt->data, avpkt->size); |
|
if ((res = vqa_decode_chunk(s, frame)) < 0) |
|
return res; |
|
|
|
/* make the palette available on the way out */ |
|
memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4); |
|
frame->palette_has_changed = 1; |
|
|
|
*got_frame = 1; |
|
|
|
/* report that the buffer was completely consumed */ |
|
return avpkt->size; |
|
} |
|
|
|
static av_cold int vqa_decode_end(AVCodecContext *avctx) |
|
{ |
|
VqaContext *s = avctx->priv_data; |
|
|
|
av_freep(&s->codebook); |
|
av_freep(&s->next_codebook_buffer); |
|
av_freep(&s->decode_buffer); |
|
|
|
return 0; |
|
} |
|
|
|
AVCodec ff_vqa_decoder = { |
|
.name = "vqavideo", |
|
.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"), |
|
.type = AVMEDIA_TYPE_VIDEO, |
|
.id = AV_CODEC_ID_WS_VQA, |
|
.priv_data_size = sizeof(VqaContext), |
|
.init = vqa_decode_init, |
|
.close = vqa_decode_end, |
|
.decode = vqa_decode_frame, |
|
.capabilities = CODEC_CAP_DR1, |
|
};
|
|
|