forked from KolibriOS/kolibrios
347 lines
11 KiB
C
347 lines
11 KiB
C
|
/*
|
||
|
|
* Microsoft Video-1 Decoder
|
||
|
|
* Copyright (C) 2003 the ffmpeg project
|
||
|
|
*
|
||
|
|
* This file is part of FFmpeg.
|
||
|
|
*
|
||
|
|
* FFmpeg is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with FFmpeg; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file
|
||
|
|
* Microsoft Video-1 Decoder by Mike Melanson (melanson@pcisys.net)
|
||
|
|
* For more information about the MS Video-1 format, visit:
|
||
|
|
* http://www.pcisys.net/~melanson/codecs/
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include "libavutil/internal.h"
|
||
|
|
#include "libavutil/intreadwrite.h"
|
||
|
|
#include "avcodec.h"
|
||
|
|
#include "internal.h"
|
||
|
|
|
||
|
|
#define PALETTE_COUNT 256
|
||
|
|
#define CHECK_STREAM_PTR(n) \
|
||
|
|
if ((stream_ptr + n) > s->size ) { \
|
||
|
|
av_log(s->avctx, AV_LOG_ERROR, " MS Video-1 warning: stream_ptr out of bounds (%d >= %d)\n", \
|
||
|
|
stream_ptr + n, s->size); \
|
||
|
|
return; \
|
||
|
|
}
|
||
|
|
|
||
|
|
typedef struct Msvideo1Context {
|
||
|
|
|
||
|
|
AVCodecContext *avctx;
|
||
|
|
AVFrame frame;
|
||
|
|
|
||
|
|
const unsigned char *buf;
|
||
|
|
int size;
|
||
|
|
|
||
|
|
int mode_8bit; /* if it's not 8-bit, it's 16-bit */
|
||
|
|
|
||
|
|
uint32_t pal[256];
|
||
|
|
} Msvideo1Context;
|
||
|
|
|
||
|
|
static av_cold int msvideo1_decode_init(AVCodecContext *avctx)
|
||
|
|
{
|
||
|
|
Msvideo1Context *s = avctx->priv_data;
|
||
|
|
|
||
|
|
s->avctx = avctx;
|
||
|
|
|
||
|
|
/* figure out the colorspace based on the presence of a palette */
|
||
|
|
if (s->avctx->bits_per_coded_sample == 8) {
|
||
|
|
s->mode_8bit = 1;
|
||
|
|
avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
||
|
|
} else {
|
||
|
|
s->mode_8bit = 0;
|
||
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB555;
|
||
|
|
}
|
||
|
|
|
||
|
|
avcodec_get_frame_defaults(&s->frame);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void msvideo1_decode_8bit(Msvideo1Context *s)
|
||
|
|
{
|
||
|
|
int block_ptr, pixel_ptr;
|
||
|
|
int total_blocks;
|
||
|
|
int pixel_x, pixel_y; /* pixel width and height iterators */
|
||
|
|
int block_x, block_y; /* block width and height iterators */
|
||
|
|
int blocks_wide, blocks_high; /* width and height in 4x4 blocks */
|
||
|
|
int block_inc;
|
||
|
|
int row_dec;
|
||
|
|
|
||
|
|
/* decoding parameters */
|
||
|
|
int stream_ptr;
|
||
|
|
unsigned char byte_a, byte_b;
|
||
|
|
unsigned short flags;
|
||
|
|
int skip_blocks;
|
||
|
|
unsigned char colors[8];
|
||
|
|
unsigned char *pixels = s->frame.data[0];
|
||
|
|
int stride = s->frame.linesize[0];
|
||
|
|
|
||
|
|
stream_ptr = 0;
|
||
|
|
skip_blocks = 0;
|
||
|
|
blocks_wide = s->avctx->width / 4;
|
||
|
|
blocks_high = s->avctx->height / 4;
|
||
|
|
total_blocks = blocks_wide * blocks_high;
|
||
|
|
block_inc = 4;
|
||
|
|
row_dec = stride + 4;
|
||
|
|
|
||
|
|
for (block_y = blocks_high; block_y > 0; block_y--) {
|
||
|
|
block_ptr = ((block_y * 4) - 1) * stride;
|
||
|
|
for (block_x = blocks_wide; block_x > 0; block_x--) {
|
||
|
|
/* check if this block should be skipped */
|
||
|
|
if (skip_blocks) {
|
||
|
|
block_ptr += block_inc;
|
||
|
|
skip_blocks--;
|
||
|
|
total_blocks--;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
pixel_ptr = block_ptr;
|
||
|
|
|
||
|
|
/* get the next two bytes in the encoded data stream */
|
||
|
|
CHECK_STREAM_PTR(2);
|
||
|
|
byte_a = s->buf[stream_ptr++];
|
||
|
|
byte_b = s->buf[stream_ptr++];
|
||
|
|
|
||
|
|
/* check if the decode is finished */
|
||
|
|
if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0))
|
||
|
|
return;
|
||
|
|
else if ((byte_b & 0xFC) == 0x84) {
|
||
|
|
/* skip code, but don't count the current block */
|
||
|
|
skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
|
||
|
|
} else if (byte_b < 0x80) {
|
||
|
|
/* 2-color encoding */
|
||
|
|
flags = (byte_b << 8) | byte_a;
|
||
|
|
|
||
|
|
CHECK_STREAM_PTR(2);
|
||
|
|
colors[0] = s->buf[stream_ptr++];
|
||
|
|
colors[1] = s->buf[stream_ptr++];
|
||
|
|
|
||
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
||
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
|
||
|
|
pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1];
|
||
|
|
pixel_ptr -= row_dec;
|
||
|
|
}
|
||
|
|
} else if (byte_b >= 0x90) {
|
||
|
|
/* 8-color encoding */
|
||
|
|
flags = (byte_b << 8) | byte_a;
|
||
|
|
|
||
|
|
CHECK_STREAM_PTR(8);
|
||
|
|
memcpy(colors, &s->buf[stream_ptr], 8);
|
||
|
|
stream_ptr += 8;
|
||
|
|
|
||
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
||
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
|
||
|
|
pixels[pixel_ptr++] =
|
||
|
|
colors[((pixel_y & 0x2) << 1) +
|
||
|
|
(pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
|
||
|
|
pixel_ptr -= row_dec;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
/* 1-color encoding */
|
||
|
|
colors[0] = byte_a;
|
||
|
|
|
||
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
||
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++)
|
||
|
|
pixels[pixel_ptr++] = colors[0];
|
||
|
|
pixel_ptr -= row_dec;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
block_ptr += block_inc;
|
||
|
|
total_blocks--;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* make the palette available on the way out */
|
||
|
|
if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
|
||
|
|
memcpy(s->frame.data[1], s->pal, AVPALETTE_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void msvideo1_decode_16bit(Msvideo1Context *s)
|
||
|
|
{
|
||
|
|
int block_ptr, pixel_ptr;
|
||
|
|
int total_blocks;
|
||
|
|
int pixel_x, pixel_y; /* pixel width and height iterators */
|
||
|
|
int block_x, block_y; /* block width and height iterators */
|
||
|
|
int blocks_wide, blocks_high; /* width and height in 4x4 blocks */
|
||
|
|
int block_inc;
|
||
|
|
int row_dec;
|
||
|
|
|
||
|
|
/* decoding parameters */
|
||
|
|
int stream_ptr;
|
||
|
|
unsigned char byte_a, byte_b;
|
||
|
|
unsigned short flags;
|
||
|
|
int skip_blocks;
|
||
|
|
unsigned short colors[8];
|
||
|
|
unsigned short *pixels = (unsigned short *)s->frame.data[0];
|
||
|
|
int stride = s->frame.linesize[0] / 2;
|
||
|
|
|
||
|
|
stream_ptr = 0;
|
||
|
|
skip_blocks = 0;
|
||
|
|
blocks_wide = s->avctx->width / 4;
|
||
|
|
blocks_high = s->avctx->height / 4;
|
||
|
|
total_blocks = blocks_wide * blocks_high;
|
||
|
|
block_inc = 4;
|
||
|
|
row_dec = stride + 4;
|
||
|
|
|
||
|
|
for (block_y = blocks_high; block_y > 0; block_y--) {
|
||
|
|
block_ptr = ((block_y * 4) - 1) * stride;
|
||
|
|
for (block_x = blocks_wide; block_x > 0; block_x--) {
|
||
|
|
/* check if this block should be skipped */
|
||
|
|
if (skip_blocks) {
|
||
|
|
block_ptr += block_inc;
|
||
|
|
skip_blocks--;
|
||
|
|
total_blocks--;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
pixel_ptr = block_ptr;
|
||
|
|
|
||
|
|
/* get the next two bytes in the encoded data stream */
|
||
|
|
CHECK_STREAM_PTR(2);
|
||
|
|
byte_a = s->buf[stream_ptr++];
|
||
|
|
byte_b = s->buf[stream_ptr++];
|
||
|
|
|
||
|
|
/* check if the decode is finished */
|
||
|
|
if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0)) {
|
||
|
|
return;
|
||
|
|
} else if ((byte_b & 0xFC) == 0x84) {
|
||
|
|
/* skip code, but don't count the current block */
|
||
|
|
skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
|
||
|
|
} else if (byte_b < 0x80) {
|
||
|
|
/* 2- or 8-color encoding modes */
|
||
|
|
flags = (byte_b << 8) | byte_a;
|
||
|
|
|
||
|
|
CHECK_STREAM_PTR(4);
|
||
|
|
colors[0] = AV_RL16(&s->buf[stream_ptr]);
|
||
|
|
stream_ptr += 2;
|
||
|
|
colors[1] = AV_RL16(&s->buf[stream_ptr]);
|
||
|
|
stream_ptr += 2;
|
||
|
|
|
||
|
|
if (colors[0] & 0x8000) {
|
||
|
|
/* 8-color encoding */
|
||
|
|
CHECK_STREAM_PTR(12);
|
||
|
|
colors[2] = AV_RL16(&s->buf[stream_ptr]);
|
||
|
|
stream_ptr += 2;
|
||
|
|
colors[3] = AV_RL16(&s->buf[stream_ptr]);
|
||
|
|
stream_ptr += 2;
|
||
|
|
colors[4] = AV_RL16(&s->buf[stream_ptr]);
|
||
|
|
stream_ptr += 2;
|
||
|
|
colors[5] = AV_RL16(&s->buf[stream_ptr]);
|
||
|
|
stream_ptr += 2;
|
||
|
|
colors[6] = AV_RL16(&s->buf[stream_ptr]);
|
||
|
|
stream_ptr += 2;
|
||
|
|
colors[7] = AV_RL16(&s->buf[stream_ptr]);
|
||
|
|
stream_ptr += 2;
|
||
|
|
|
||
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
||
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
|
||
|
|
pixels[pixel_ptr++] =
|
||
|
|
colors[((pixel_y & 0x2) << 1) +
|
||
|
|
(pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
|
||
|
|
pixel_ptr -= row_dec;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
/* 2-color encoding */
|
||
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
||
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
|
||
|
|
pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1];
|
||
|
|
pixel_ptr -= row_dec;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
/* otherwise, it's a 1-color block */
|
||
|
|
colors[0] = (byte_b << 8) | byte_a;
|
||
|
|
|
||
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
||
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++)
|
||
|
|
pixels[pixel_ptr++] = colors[0];
|
||
|
|
pixel_ptr -= row_dec;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
block_ptr += block_inc;
|
||
|
|
total_blocks--;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int msvideo1_decode_frame(AVCodecContext *avctx,
|
||
|
|
void *data, int *got_frame,
|
||
|
|
AVPacket *avpkt)
|
||
|
|
{
|
||
|
|
const uint8_t *buf = avpkt->data;
|
||
|
|
int buf_size = avpkt->size;
|
||
|
|
Msvideo1Context *s = avctx->priv_data;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
s->buf = buf;
|
||
|
|
s->size = buf_size;
|
||
|
|
|
||
|
|
if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (s->mode_8bit) {
|
||
|
|
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
|
||
|
|
|
||
|
|
if (pal) {
|
||
|
|
memcpy(s->pal, pal, AVPALETTE_SIZE);
|
||
|
|
s->frame.palette_has_changed = 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (s->mode_8bit)
|
||
|
|
msvideo1_decode_8bit(s);
|
||
|
|
else
|
||
|
|
msvideo1_decode_16bit(s);
|
||
|
|
|
||
|
|
if ((ret = av_frame_ref(data, &s->frame)) < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
*got_frame = 1;
|
||
|
|
|
||
|
|
/* report that the buffer was completely consumed */
|
||
|
|
return buf_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
static av_cold int msvideo1_decode_end(AVCodecContext *avctx)
|
||
|
|
{
|
||
|
|
Msvideo1Context *s = avctx->priv_data;
|
||
|
|
|
||
|
|
av_frame_unref(&s->frame);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVCodec ff_msvideo1_decoder = {
|
||
|
|
.name = "msvideo1",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("Microsoft Video 1"),
|
||
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
||
|
|
.id = AV_CODEC_ID_MSVIDEO1,
|
||
|
|
.priv_data_size = sizeof(Msvideo1Context),
|
||
|
|
.init = msvideo1_decode_init,
|
||
|
|
.close = msvideo1_decode_end,
|
||
|
|
.decode = msvideo1_decode_frame,
|
||
|
|
.capabilities = CODEC_CAP_DR1,
|
||
|
|
};
|