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/* |
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* 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
*/
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#include <string.h>
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#include "libavutil/imgutils.h" |
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#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h" |
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#include "avcodec.h" |
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#include "internal.h" |
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typedef struct YopDecContext {
AVCodecContext *avctx; |
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AVFrame *frame; |
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int num_pal_colors;
int first_color[2];
int frame_data_length;
uint8_t *low_nibble;
uint8_t *srcptr; |
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uint8_t *src_end; |
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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},
};
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static av_cold int yop_decode_close(AVCodecContext *avctx) |
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{
YopDecContext *s = avctx->priv_data;
av_frame_free(&s->frame); |
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return 0; |
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}
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static av_cold int yop_decode_init(AVCodecContext *avctx)
{
YopDecContext *s = avctx->priv_data;
s->avctx = avctx;
if (avctx->width & 1 || avctx->height & 1 || |
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av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "YOP has invalid dimensions\n"); |
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return AVERROR_INVALIDDATA; |
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}
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if (avctx->extradata_size < 3) {
av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata.\n"); |
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return AVERROR_INVALIDDATA;
}
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avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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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, |
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"Palette parameters invalid, header probably corrupt\n"); |
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return AVERROR_INVALIDDATA;
}
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s->frame = av_frame_alloc(); |
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if (!s->frame)
return AVERROR(ENOMEM); |
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|
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return 0;
}
/** |
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* Paint a macroblock using the pattern in paint_lut. |
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* @param s codec context
* @param tag the tag that was in the nibble
*/ |
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static int yop_paint_block(YopDecContext *s, int linesize, int tag) |
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{ |
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if (s->src_end - s->srcptr < paint_lut[tag][3]) {
av_log(s->avctx, AV_LOG_ERROR, "Packet too small.\n");
return AVERROR_INVALIDDATA;
}
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s->dstptr[0] = s->srcptr[0];
s->dstptr[1] = s->srcptr[paint_lut[tag][0]];
s->dstptr[linesize] = s->srcptr[paint_lut[tag][1]];
s->dstptr[linesize + 1] = s->srcptr[paint_lut[tag][2]]; |
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// The number of src bytes consumed is in the last part of the lut entry.
s->srcptr += paint_lut[tag][3]; |
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return 0; |
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}
/** |
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* Copy a previously painted macroblock to the current_block. |
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* @param copy_tag the tag that was in the nibble
*/ |
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static int yop_copy_previous_block(YopDecContext *s, int linesize, int copy_tag) |
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{
uint8_t *bufptr;
// Calculate position for the copy source
bufptr = s->dstptr + motion_vector[copy_tag][0] + |
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linesize * motion_vector[copy_tag][1]; |
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if (bufptr < s->dstbuf) { |
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av_log(s->avctx, AV_LOG_ERROR, "File probably corrupt\n"); |
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return AVERROR_INVALIDDATA;
}
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s->dstptr[0] = bufptr[0];
s->dstptr[1] = bufptr[1];
s->dstptr[linesize] = bufptr[linesize];
s->dstptr[linesize + 1] = bufptr[linesize + 1]; |
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return 0;
}
/** |
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* Return the next nibble in sequence, consuming a new byte on the input |
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* 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;
}
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static int yop_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
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AVPacket *avpkt)
{
YopDecContext *s = avctx->priv_data; |
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AVFrame *frame = s->frame; |
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int tag, firstcolor, is_odd_frame; |
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int ret, i, x, y; |
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uint32_t *palette;
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if (avpkt->size < 4 + 3 * s->num_pal_colors) {
av_log(avctx, AV_LOG_ERROR, "Packet too small.\n"); |
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return AVERROR_INVALIDDATA;
}
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if ((ret = ff_reget_buffer(avctx, frame)) < 0) |
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return ret;
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if (!avctx->frame_number) |
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memset(frame->data[1], 0, AVPALETTE_SIZE); |
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s->dstbuf = frame->data[0];
s->dstptr = frame->data[0]; |
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s->srcptr = avpkt->data + 4; |
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s->src_end = avpkt->data + avpkt->size; |
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s->low_nibble = NULL;
is_odd_frame = avpkt->data[0]; |
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if(is_odd_frame>1){
av_log(avctx, AV_LOG_ERROR, "frame is too odd %d\n", is_odd_frame);
return AVERROR_INVALIDDATA;
} |
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firstcolor = s->first_color[is_odd_frame]; |
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palette = (uint32_t *)frame->data[1]; |
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for (i = 0; i < s->num_pal_colors; i++, s->srcptr += 3) { |
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palette[i + firstcolor] = (s->srcptr[0] << 18) |
(s->srcptr[1] << 10) |
(s->srcptr[2] << 2); |
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palette[i + firstcolor] |= 0xFFU << 24 | |
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(palette[i + firstcolor] >> 6) & 0x30303; |
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} |
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|
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frame->palette_has_changed = 1; |
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for (y = 0; y < avctx->height; y += 2) {
for (x = 0; x < avctx->width; x += 2) {
if (s->srcptr - avpkt->data >= avpkt->size) {
av_log(avctx, AV_LOG_ERROR, "Packet too small.\n");
return AVERROR_INVALIDDATA;
} |
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tag = yop_get_next_nibble(s); |
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if (tag != 0xf) { |
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ret = yop_paint_block(s, frame->linesize[0], tag); |
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if (ret < 0)
return ret; |
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} else {
tag = yop_get_next_nibble(s); |
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ret = yop_copy_previous_block(s, frame->linesize[0], tag);
if (ret < 0) |
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return ret; |
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} |
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s->dstptr += 2; |
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} |
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s->dstptr += 2*frame->linesize[0] - x; |
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}
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if ((ret = av_frame_ref(data, s->frame)) < 0)
return ret;
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*got_frame = 1; |
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return avpkt->size;
}
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AVCodec ff_yop_decoder = { |
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.name = "yop", |
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.long_name = NULL_IF_CONFIG_SMALL("Psygnosis YOP Video"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_YOP, |
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.priv_data_size = sizeof(YopDecContext),
.init = yop_decode_init, |
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.close = yop_decode_close, |
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.decode = yop_decode_frame, |
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}; |