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/*
* 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
*/
/** |
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* @file |
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* @brief Bethesda Softworks VID Video Decoder
* @author Nicholas Tung [ntung (at. ntung com] (2007-03) |
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* @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
* @see http://www.svatopluk.com/andux/docs/dfvid.html |
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*/
|
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#include "libavutil/common.h" |
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#include "dsputil.h"
#include "bethsoftvideo.h"
#include "bytestream.h"
typedef struct BethsoftvidContext {
AVFrame frame; |
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GetByteContext g; |
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} BethsoftvidContext;
|
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static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx) |
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{
BethsoftvidContext *vid = avctx->priv_data; |
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avcodec_get_frame_defaults(&vid->frame); |
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vid->frame.reference = 3; |
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vid->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; |
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avctx->pix_fmt = PIX_FMT_PAL8; |
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return 0;
}
|
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static int set_palette(BethsoftvidContext *ctx) |
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{ |
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uint32_t *palette = (uint32_t *)ctx->frame.data[1]; |
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int a; |
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|
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if (bytestream2_get_bytes_left(&ctx->g) < 256*3) |
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return AVERROR_INVALIDDATA;
|
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for(a = 0; a < 256; a++){ |
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palette[a] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->g) * 4; |
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palette[a] |= palette[a] >> 6 & 0x30303; |
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} |
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ctx->frame.palette_has_changed = 1; |
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return 0; |
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}
static int bethsoftvid_decode_frame(AVCodecContext *avctx,
void *data, int *data_size, |
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AVPacket *avpkt) |
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{
BethsoftvidContext * vid = avctx->priv_data;
char block_type; |
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uint8_t * dst; |
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uint8_t * frame_end; |
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int remaining = avctx->width; // number of bytes remaining on a line |
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int wrap_to_next_line;
int code, ret; |
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int yoffset;
if (avctx->reget_buffer(avctx, &vid->frame)) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return -1;
} |
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wrap_to_next_line = vid->frame.linesize[0] - avctx->width;
if (avpkt->side_data_elems > 0 &&
avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) {
bytestream2_init(&vid->g, avpkt->side_data[0].data,
avpkt->side_data[0].size);
if ((ret = set_palette(vid)) < 0)
return ret;
} |
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bytestream2_init(&vid->g, avpkt->data, avpkt->size); |
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dst = vid->frame.data[0]; |
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frame_end = vid->frame.data[0] + vid->frame.linesize[0] * avctx->height;
|
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switch(block_type = bytestream2_get_byte(&vid->g)){
case PALETTE_BLOCK: { |
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*data_size = 0;
if ((ret = set_palette(vid)) < 0) {
av_log(avctx, AV_LOG_ERROR, "error reading palette\n");
return ret;
}
return bytestream2_tell(&vid->g); |
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} |
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case VIDEO_YOFF_P_FRAME: |
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yoffset = bytestream2_get_le16(&vid->g); |
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if(yoffset >= avctx->height)
return -1; |
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dst += vid->frame.linesize[0] * yoffset; |
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}
// main code |
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while((code = bytestream2_get_byte(&vid->g))){ |
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int length = code & 0x7f; |
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// copy any bytes starting at the current position, and ending at the frame width |
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while(length > remaining){
if(code < 0x80) |
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bytestream2_get_buffer(&vid->g, dst, remaining); |
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else if(block_type == VIDEO_I_FRAME) |
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memset(dst, bytestream2_peek_byte(&vid->g), remaining); |
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length -= remaining; // decrement the number of bytes to be copied
dst += remaining + wrap_to_next_line; // skip over extra bytes at end of frame
remaining = avctx->width;
if(dst == frame_end) |
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goto end; |
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}
// copy any remaining bytes after / if line overflows |
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if(code < 0x80) |
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bytestream2_get_buffer(&vid->g, dst, length); |
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else if(block_type == VIDEO_I_FRAME) |
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memset(dst, bytestream2_get_byte(&vid->g), length); |
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remaining -= length;
dst += length; |
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}
end:
*data_size = sizeof(AVFrame);
*(AVFrame*)data = vid->frame;
|
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return avpkt->size; |
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}
|
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static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx) |
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{
BethsoftvidContext * vid = avctx->priv_data; |
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if(vid->frame.data[0])
avctx->release_buffer(avctx, &vid->frame); |
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return 0;
}
|
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AVCodec ff_bethsoftvid_decoder = { |
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.name = "bethsoftvid",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_BETHSOFTVID, |
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.priv_data_size = sizeof(BethsoftvidContext), |
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.init = bethsoftvid_decode_init,
.close = bethsoftvid_decode_end,
.decode = bethsoftvid_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Bethesda VID video"), |
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}; |