mirror of https://git.ffmpeg.org/ffmpeg.git
353 lines
11 KiB
C
353 lines
11 KiB
C
/*
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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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/**
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* @file msvideo1.c
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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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* This decoder outputs either PAL8 or RGB555 data, depending on the
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* whether a RGB palette was passed through palctrl;
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* if it's present, then the data is PAL8; RGB555 otherwise.
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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 <unistd.h>
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#include "common.h"
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#include "avcodec.h"
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#include "dsputil.h"
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#define PALETTE_COUNT 256
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#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
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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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DSPContext dsp;
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AVFrame frame;
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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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} Msvideo1Context;
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static int msvideo1_decode_init(AVCodecContext *avctx)
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{
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Msvideo1Context *s = (Msvideo1Context *)avctx->priv_data;
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s->avctx = avctx;
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/* figure out the colorspace based on the presence of a palette */
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if (s->avctx->palctrl) {
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s->mode_8bit = 1;
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avctx->pix_fmt = PIX_FMT_PAL8;
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} else {
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s->mode_8bit = 0;
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avctx->pix_fmt = PIX_FMT_RGB555;
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}
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avctx->has_b_frames = 0;
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dsputil_init(&s->dsp, avctx);
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s->frame.data[0] = NULL;
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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 == PIX_FMT_PAL8) {
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memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
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if (s->avctx->palctrl->palette_changed) {
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s->frame.palette_has_changed = 1;
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s->avctx->palctrl->palette_changed = 0;
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}
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}
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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] = LE_16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[1] = LE_16(&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] = LE_16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[3] = LE_16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[4] = LE_16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[5] = LE_16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[6] = LE_16(&s->buf[stream_ptr]);
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stream_ptr += 2;
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colors[7] = LE_16(&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 *data_size,
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uint8_t *buf, int buf_size)
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{
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Msvideo1Context *s = (Msvideo1Context *)avctx->priv_data;
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/* no supplementary picture */
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if (buf_size == 0)
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return 0;
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s->buf = buf;
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s->size = buf_size;
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s->frame.reference = 1;
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s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
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if (avctx->reget_buffer(avctx, &s->frame)) {
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av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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return -1;
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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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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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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 int msvideo1_decode_end(AVCodecContext *avctx)
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{
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Msvideo1Context *s = (Msvideo1Context *)avctx->priv_data;
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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return 0;
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}
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AVCodec msvideo1_decoder = {
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"msvideo1",
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CODEC_TYPE_VIDEO,
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CODEC_ID_MSVIDEO1,
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sizeof(Msvideo1Context),
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msvideo1_decode_init,
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NULL,
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msvideo1_decode_end,
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msvideo1_decode_frame,
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CODEC_CAP_DR1,
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};
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