mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-19 14:00:43 +00:00
e16f217ceb
Originally committed as revision 25058 to svn://svn.ffmpeg.org/ffmpeg/trunk
262 lines
7.3 KiB
C
262 lines
7.3 KiB
C
/**
|
|
* @file
|
|
* Psygnosis YOP decoder
|
|
*
|
|
* Copyright (C) 2010 Mohamed Naufal Basheer <naufal11@gmail.com>
|
|
* derived from the code by
|
|
* Copyright (C) 2009 Thomas P. Higdon <thomas.p.higdon@gmail.com>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavcore/imgutils.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
|
|
typedef struct YopDecContext {
|
|
AVFrame frame;
|
|
AVCodecContext *avctx;
|
|
|
|
int num_pal_colors;
|
|
int first_color[2];
|
|
int frame_data_length;
|
|
int row_pos;
|
|
|
|
uint8_t *low_nibble;
|
|
uint8_t *srcptr;
|
|
uint8_t *dstptr;
|
|
uint8_t *dstbuf;
|
|
} YopDecContext;
|
|
|
|
// These tables are taken directly from:
|
|
// http://wiki.multimedia.cx/index.php?title=Psygnosis_YOP
|
|
|
|
/**
|
|
* Lookup table for painting macroblocks. Bytes 0-2 of each entry contain
|
|
* the macroblock positions to be painted (taken as (0, B0, B1, B2)).
|
|
* Byte 3 contains the number of bytes consumed on the input,
|
|
* equal to max(bytes 0-2) + 1.
|
|
*/
|
|
static const uint8_t paint_lut[15][4] =
|
|
{{1, 2, 3, 4}, {1, 2, 0, 3},
|
|
{1, 2, 1, 3}, {1, 2, 2, 3},
|
|
{1, 0, 2, 3}, {1, 0, 0, 2},
|
|
{1, 0, 1, 2}, {1, 1, 2, 3},
|
|
{0, 1, 2, 3}, {0, 1, 0, 2},
|
|
{1, 1, 0, 2}, {0, 1, 1, 2},
|
|
{0, 0, 1, 2}, {0, 0, 0, 1},
|
|
{1, 1, 1, 2},
|
|
};
|
|
|
|
/**
|
|
* Lookup table for copying macroblocks. Each entry contains the respective
|
|
* x and y pixel offset for the copy source.
|
|
*/
|
|
static const int8_t motion_vector[16][2] =
|
|
{{-4, -4}, {-2, -4},
|
|
{ 0, -4}, { 2, -4},
|
|
{-4, -2}, {-4, 0},
|
|
{-3, -3}, {-1, -3},
|
|
{ 1, -3}, { 3, -3},
|
|
{-3, -1}, {-2, -2},
|
|
{ 0, -2}, { 2, -2},
|
|
{ 4, -2}, {-2, 0},
|
|
};
|
|
|
|
static av_cold int yop_decode_init(AVCodecContext *avctx)
|
|
{
|
|
YopDecContext *s = avctx->priv_data;
|
|
s->avctx = avctx;
|
|
|
|
if (avctx->width & 1 || avctx->height & 1 ||
|
|
av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "YOP has invalid dimensions\n");
|
|
return -1;
|
|
}
|
|
|
|
avctx->pix_fmt = PIX_FMT_PAL8;
|
|
|
|
s->num_pal_colors = avctx->extradata[0];
|
|
s->first_color[0] = avctx->extradata[1];
|
|
s->first_color[1] = avctx->extradata[2];
|
|
|
|
if (s->num_pal_colors + s->first_color[0] > 256 ||
|
|
s->num_pal_colors + s->first_color[1] > 256) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"YOP: palette parameters invalid, header probably corrupt\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int yop_decode_close(AVCodecContext *avctx)
|
|
{
|
|
YopDecContext *s = avctx->priv_data;
|
|
if (s->frame.data[0])
|
|
avctx->release_buffer(avctx, &s->frame);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Paint a macroblock using the pattern in paint_lut.
|
|
* @param s codec context
|
|
* @param tag the tag that was in the nibble
|
|
*/
|
|
static void yop_paint_block(YopDecContext *s, int tag)
|
|
{
|
|
s->dstptr[0] = s->srcptr[0];
|
|
s->dstptr[1] = s->srcptr[paint_lut[tag][0]];
|
|
s->dstptr[s->frame.linesize[0]] = s->srcptr[paint_lut[tag][1]];
|
|
s->dstptr[s->frame.linesize[0] + 1] = s->srcptr[paint_lut[tag][2]];
|
|
|
|
// The number of src bytes consumed is in the last part of the lut entry.
|
|
s->srcptr += paint_lut[tag][3];
|
|
}
|
|
|
|
/**
|
|
* Copy a previously painted macroblock to the current_block.
|
|
* @param copy_tag the tag that was in the nibble
|
|
*/
|
|
static int yop_copy_previous_block(YopDecContext *s, int copy_tag)
|
|
{
|
|
uint8_t *bufptr;
|
|
|
|
// Calculate position for the copy source
|
|
bufptr = s->dstptr + motion_vector[copy_tag][0] +
|
|
s->frame.linesize[0] * motion_vector[copy_tag][1];
|
|
if (bufptr < s->dstbuf) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"YOP: cannot decode, file probably corrupt\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
s->dstptr[0] = bufptr[0];
|
|
s->dstptr[1] = bufptr[1];
|
|
s->dstptr[s->frame.linesize[0]] = bufptr[s->frame.linesize[0]];
|
|
s->dstptr[s->frame.linesize[0] + 1] = bufptr[s->frame.linesize[0] + 1];
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Return the next nibble in sequence, consuming a new byte on the input
|
|
* only if necessary.
|
|
*/
|
|
static uint8_t yop_get_next_nibble(YopDecContext *s)
|
|
{
|
|
int ret;
|
|
|
|
if (s->low_nibble) {
|
|
ret = *s->low_nibble & 0xf;
|
|
s->low_nibble = NULL;
|
|
}else {
|
|
s->low_nibble = s->srcptr++;
|
|
ret = *s->low_nibble >> 4;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Take s->dstptr to the next macroblock in sequence.
|
|
*/
|
|
static void yop_next_macroblock(YopDecContext *s)
|
|
{
|
|
// If we are advancing to the next row of macroblocks
|
|
if (s->row_pos == s->frame.linesize[0] - 2) {
|
|
s->dstptr += s->frame.linesize[0];
|
|
s->row_pos = 0;
|
|
}else {
|
|
s->row_pos += 2;
|
|
}
|
|
s->dstptr += 2;
|
|
}
|
|
|
|
static int yop_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
YopDecContext *s = avctx->priv_data;
|
|
int tag, firstcolor, is_odd_frame;
|
|
int ret, i;
|
|
uint32_t *palette;
|
|
|
|
if (s->frame.data[0])
|
|
avctx->release_buffer(avctx, &s->frame);
|
|
|
|
ret = avctx->get_buffer(avctx, &s->frame);
|
|
if (ret < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return ret;
|
|
}
|
|
|
|
s->frame.linesize[0] = avctx->width;
|
|
|
|
s->dstbuf = s->frame.data[0];
|
|
s->dstptr = s->frame.data[0];
|
|
s->srcptr = avpkt->data + 4;
|
|
s->row_pos = 0;
|
|
s->low_nibble = NULL;
|
|
|
|
is_odd_frame = avpkt->data[0];
|
|
firstcolor = s->first_color[is_odd_frame];
|
|
palette = (uint32_t *)s->frame.data[1];
|
|
|
|
for (i = 0; i < s->num_pal_colors; i++, s->srcptr += 3)
|
|
palette[i + firstcolor] = (s->srcptr[0] << 18) |
|
|
(s->srcptr[1] << 10) |
|
|
(s->srcptr[2] << 2);
|
|
|
|
s->frame.palette_has_changed = 1;
|
|
|
|
while (s->dstptr - s->dstbuf <
|
|
avctx->width * avctx->height &&
|
|
s->srcptr - avpkt->data < avpkt->size) {
|
|
|
|
tag = yop_get_next_nibble(s);
|
|
|
|
if (tag != 0xf) {
|
|
yop_paint_block(s, tag);
|
|
}else {
|
|
tag = yop_get_next_nibble(s);
|
|
ret = yop_copy_previous_block(s, tag);
|
|
if (ret < 0) {
|
|
avctx->release_buffer(avctx, &s->frame);
|
|
return ret;
|
|
}
|
|
}
|
|
yop_next_macroblock(s);
|
|
}
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame *) data = s->frame;
|
|
return avpkt->size;
|
|
}
|
|
|
|
AVCodec yop_decoder = {
|
|
"yop",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_YOP,
|
|
sizeof(YopDecContext),
|
|
yop_decode_init,
|
|
NULL,
|
|
yop_decode_close,
|
|
yop_decode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Psygnosis YOP Video"),
|
|
};
|