2007-04-07 22:51:58 +02:00
|
|
|
/*
|
|
|
|
* Bethesda VID video decoder
|
|
|
|
* Copyright (C) 2007 Nicholas Tung
|
|
|
|
*
|
|
|
|
* 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 bethsoftvideo.c
|
|
|
|
* @brief Bethesda Softworks VID Video Decoder
|
|
|
|
* @author Nicholas Tung [ntung (at. ntung com] (2007-03)
|
|
|
|
* @sa http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
|
|
|
|
* @sa http://www.svatopluk.com/andux/docs/dfvid.html
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include "common.h"
|
|
|
|
#include "dsputil.h"
|
|
|
|
#include "bethsoftvideo.h"
|
|
|
|
#include "bytestream.h"
|
|
|
|
|
|
|
|
typedef struct BethsoftvidContext {
|
|
|
|
AVFrame frame;
|
|
|
|
} BethsoftvidContext;
|
|
|
|
|
|
|
|
static int bethsoftvid_decode_init(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
BethsoftvidContext *vid = avctx->priv_data;
|
|
|
|
vid->frame.reference = 1;
|
|
|
|
vid->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
|
|
|
|
FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
|
|
|
|
avctx->pix_fmt = PIX_FMT_PAL8; // palette in vid->frame.data[1]
|
|
|
|
av_log(avctx, AV_LOG_DEBUG, "[bethsoftvid video decoder] init\n");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void set_palette(AVFrame * frame, uint8_t * palette_buffer)
|
|
|
|
{
|
|
|
|
uint32_t * palette = (uint32_t *)frame->data[1];
|
|
|
|
int a;
|
2007-04-08 01:10:22 +02:00
|
|
|
for(a = 0; a < 256; a++)
|
2007-04-07 22:51:58 +02:00
|
|
|
{
|
|
|
|
palette[a] = AV_RB24(&palette_buffer[a * 3]) * 4; // multiply all colors by 4
|
|
|
|
}
|
|
|
|
frame->palette_has_changed = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int bethsoftvid_decode_frame(AVCodecContext *avctx,
|
|
|
|
void *data, int *data_size,
|
|
|
|
uint8_t *buf, int buf_size)
|
|
|
|
{
|
|
|
|
BethsoftvidContext * vid = avctx->priv_data;
|
|
|
|
char block_type;
|
|
|
|
uint8_t * destination;
|
|
|
|
uint8_t * frame_end;
|
|
|
|
int line_remaining = avctx->width; // number of bytes remaining on a line
|
|
|
|
const int wrap_to_next_line = vid->frame.linesize[0] - avctx->width;
|
|
|
|
uint8_t rle_num_bytes;
|
|
|
|
int yoffset;
|
|
|
|
|
|
|
|
av_log(avctx, AV_LOG_DEBUG, "[bethsoftvid video decoder] decoding frame\n");
|
|
|
|
|
|
|
|
// reget buffer will copy old data, good for simple difference frames
|
|
|
|
if (avctx->reget_buffer(avctx, &vid->frame)) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
destination = vid->frame.data[0];
|
|
|
|
frame_end = vid->frame.data[0] + vid->frame.linesize[0] * avctx->height;
|
|
|
|
|
|
|
|
switch(block_type = *buf++)
|
|
|
|
{
|
|
|
|
case PALETTE_BLOCK: set_palette(&vid->frame, buf); return 0;
|
2007-04-08 01:10:22 +02:00
|
|
|
case VIDEO_YOFF_P_FRAME:
|
2007-04-07 22:51:58 +02:00
|
|
|
yoffset = bytestream_get_le16(&buf);
|
|
|
|
if(yoffset >= avctx->height) { return -1; }
|
|
|
|
destination += vid->frame.linesize[0] * yoffset;
|
|
|
|
}
|
|
|
|
|
|
|
|
// main code
|
|
|
|
while((rle_num_bytes = *buf++))
|
|
|
|
{
|
|
|
|
int length = rle_num_bytes & 0x7f;
|
|
|
|
|
|
|
|
// copy any bytes starting at the current position, and ending at the frame width
|
|
|
|
while(length > line_remaining)
|
|
|
|
{
|
|
|
|
if(rle_num_bytes < 0x80) { bytestream_get_buffer(&buf, destination, line_remaining); }
|
2007-04-08 01:10:22 +02:00
|
|
|
else if(block_type == VIDEO_I_FRAME) { memset(destination, buf[0], line_remaining); }
|
2007-04-07 22:51:58 +02:00
|
|
|
length -= line_remaining; // decrement the number of bytes to be copied
|
|
|
|
destination += line_remaining + wrap_to_next_line; // skip over extra bytes at end of frame
|
|
|
|
line_remaining = avctx->width;
|
|
|
|
if(destination == frame_end) { goto end; }
|
|
|
|
}
|
|
|
|
|
|
|
|
// copy any remaining bytes after / if line overflows
|
|
|
|
if(rle_num_bytes < 0x80) { bytestream_get_buffer(&buf, destination, length); }
|
2007-04-08 01:10:22 +02:00
|
|
|
else if(block_type == VIDEO_I_FRAME) { memset(destination, *buf++, length); }
|
2007-04-07 22:51:58 +02:00
|
|
|
line_remaining -= length;
|
|
|
|
destination += length;
|
|
|
|
}
|
|
|
|
end:
|
|
|
|
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
|
|
*(AVFrame*)data = vid->frame;
|
|
|
|
|
|
|
|
return buf_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int bethsoftvid_decode_end(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
BethsoftvidContext * vid = avctx->priv_data;
|
|
|
|
av_log(avctx, AV_LOG_DEBUG, "[bethsoftvid video decoder] closing\n");
|
|
|
|
if(vid->frame.data[0]) { avctx->release_buffer(avctx, &vid->frame); }
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
AVCodec bethsoftvid_decoder = {
|
|
|
|
.name = "bethsoftvid",
|
|
|
|
.type = CODEC_TYPE_VIDEO,
|
|
|
|
.id = CODEC_ID_BETHSOFTVID,
|
|
|
|
.priv_data_size = sizeof(BethsoftvidContext),
|
|
|
|
.init = bethsoftvid_decode_init,
|
|
|
|
.close = bethsoftvid_decode_end,
|
|
|
|
.decode = bethsoftvid_decode_frame,
|
|
|
|
};
|