362 lines
12 KiB
C
Executable File
362 lines
12 KiB
C
Executable File
/*
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* Microsoft Video-1 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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* @file
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* Microsoft Video-1 Decoder by Mike Melanson (melanson@pcisys.net)
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* For more information about the MS Video-1 format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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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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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "internal.h"
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#define PALETTE_COUNT 256
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#define CHECK_STREAM_PTR(n) \
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if ((stream_ptr + n) > s->size ) { \
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av_log(s->avctx, AV_LOG_ERROR, " MS Video-1 warning: stream_ptr out of bounds (%d >= %d)\n", \
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stream_ptr + n, s->size); \
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return; \
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}
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typedef struct Msvideo1Context {
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AVCodecContext *avctx;
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AVFrame *frame;
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const unsigned char *buf;
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int size;
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int mode_8bit; /* if it's not 8-bit, it's 16-bit */
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uint32_t pal[256];
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} Msvideo1Context;
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static av_cold int msvideo1_decode_init(AVCodecContext *avctx)
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{
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Msvideo1Context *s = avctx->priv_data;
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s->avctx = avctx;
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if (avctx->width < 4 || avctx->height < 4)
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return AVERROR_INVALIDDATA;
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/* figure out the colorspace based on the presence of a palette */
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if (s->avctx->bits_per_coded_sample == 8) {
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s->mode_8bit = 1;
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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if (avctx->extradata_size >= AVPALETTE_SIZE)
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memcpy(s->pal, avctx->extradata, AVPALETTE_SIZE);
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} else {
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s->mode_8bit = 0;
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avctx->pix_fmt = AV_PIX_FMT_RGB555;
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}
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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static void msvideo1_decode_8bit(Msvideo1Context *s)
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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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unsigned char colors[8];
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unsigned char *pixels = s->frame->data[0];
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int stride = s->frame->linesize[0];
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stream_ptr = 0;
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skip_blocks = 0;
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blocks_wide = s->avctx->width / 4;
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blocks_high = s->avctx->height / 4;
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total_blocks = blocks_wide * blocks_high;
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block_inc = 4;
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row_dec = stride + 4;
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for (block_y = blocks_high; block_y > 0; block_y--) {
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block_ptr = ((block_y * 4) - 1) * stride;
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for (block_x = blocks_wide; block_x > 0; block_x--) {
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/* check if this block should be skipped */
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if (skip_blocks) {
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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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CHECK_STREAM_PTR(2);
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byte_a = s->buf[stream_ptr++];
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byte_b = s->buf[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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else if ((byte_b & 0xFC) == 0x84) {
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/* skip code, but don't count the current block */
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skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
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} else if (byte_b < 0x80) {
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/* 2-color encoding */
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flags = (byte_b << 8) | byte_a;
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CHECK_STREAM_PTR(2);
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colors[0] = s->buf[stream_ptr++];
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colors[1] = s->buf[stream_ptr++];
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
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pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1];
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pixel_ptr -= row_dec;
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}
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} else if (byte_b >= 0x90) {
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/* 8-color encoding */
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flags = (byte_b << 8) | byte_a;
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CHECK_STREAM_PTR(8);
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memcpy(colors, &s->buf[stream_ptr], 8);
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stream_ptr += 8;
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
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pixels[pixel_ptr++] =
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colors[((pixel_y & 0x2) << 1) +
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(pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
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pixel_ptr -= row_dec;
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}
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} else {
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/* 1-color encoding */
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colors[0] = byte_a;
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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for (pixel_x = 0; pixel_x < 4; pixel_x++)
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pixels[pixel_ptr++] = colors[0];
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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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/* make the palette available on the way out */
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if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
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memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
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}
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static void msvideo1_decode_16bit(Msvideo1Context *s)
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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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unsigned short colors[8];
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unsigned short *pixels = (unsigned short *)s->frame->data[0];
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int stride = s->frame->linesize[0] / 2;
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stream_ptr = 0;
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skip_blocks = 0;
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blocks_wide = s->avctx->width / 4;
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blocks_high = s->avctx->height / 4;
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total_blocks = blocks_wide * blocks_high;
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block_inc = 4;
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row_dec = stride + 4;
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for (block_y = blocks_high; block_y > 0; block_y--) {
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block_ptr = ((block_y * 4) - 1) * stride;
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for (block_x = blocks_wide; block_x > 0; block_x--) {
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/* check if this block should be skipped */
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if (skip_blocks) {
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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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CHECK_STREAM_PTR(2);
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byte_a = s->buf[stream_ptr++];
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byte_b = s->buf[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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} else if ((byte_b & 0xFC) == 0x84) {
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/* skip code, but don't count the current block */
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skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
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} else if (byte_b < 0x80) {
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/* 2- or 8-color encoding modes */
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flags = (byte_b << 8) | byte_a;
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CHECK_STREAM_PTR(4);
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colors[0] = AV_RL16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[1] = AV_RL16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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if (colors[0] & 0x8000) {
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/* 8-color encoding */
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CHECK_STREAM_PTR(12);
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colors[2] = AV_RL16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[3] = AV_RL16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[4] = AV_RL16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[5] = AV_RL16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[6] = AV_RL16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[7] = AV_RL16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
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pixels[pixel_ptr++] =
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colors[((pixel_y & 0x2) << 1) +
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(pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
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pixel_ptr -= row_dec;
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}
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} else {
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/* 2-color encoding */
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
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pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1];
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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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/* otherwise, it's a 1-color block */
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colors[0] = (byte_b << 8) | byte_a;
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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for (pixel_x = 0; pixel_x < 4; pixel_x++)
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pixels[pixel_ptr++] = colors[0];
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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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static int msvideo1_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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Msvideo1Context *s = avctx->priv_data;
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int ret;
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s->buf = buf;
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s->size = buf_size;
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// Discard frame if its smaller than the minimum frame size
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if (buf_size < (avctx->width/4) * (avctx->height/4) / 512) {
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av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
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return ret;
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if (s->mode_8bit) {
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int size;
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const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
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if (pal && size == AVPALETTE_SIZE) {
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memcpy(s->pal, pal, AVPALETTE_SIZE);
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s->frame->palette_has_changed = 1;
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} else if (pal) {
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av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
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}
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}
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if (s->mode_8bit)
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msvideo1_decode_8bit(s);
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else
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msvideo1_decode_16bit(s);
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if ((ret = av_frame_ref(data, s->frame)) < 0)
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return ret;
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*got_frame = 1;
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/* report that the buffer was completely consumed */
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return buf_size;
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}
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static av_cold int msvideo1_decode_end(AVCodecContext *avctx)
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{
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Msvideo1Context *s = avctx->priv_data;
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av_frame_free(&s->frame);
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return 0;
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}
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AVCodec ff_msvideo1_decoder = {
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.name = "msvideo1",
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.long_name = NULL_IF_CONFIG_SMALL("Microsoft Video 1"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MSVIDEO1,
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.priv_data_size = sizeof(Msvideo1Context),
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.init = msvideo1_decode_init,
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.close = msvideo1_decode_end,
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.decode = msvideo1_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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