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/*
* KMVC decoder
* Copyright (c) 2006 Konstantin Shishkov
* |
b78e7197 |
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/** |
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* @file |
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* Karl Morton's Video Codec decoder
*/
#include <stdio.h>
#include <stdlib.h>
#include "avcodec.h" |
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#include "bytestream.h" |
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#include "internal.h" |
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#include "libavutil/common.h" |
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#define KMVC_KEYFRAME 0x80
#define KMVC_PALETTE 0x40
#define KMVC_METHOD 0x0F |
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#define MAX_PALSIZE 256 |
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/*
* Decoder context
*/
typedef struct KmvcContext {
AVCodecContext *avctx;
int setpal;
int palsize; |
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uint32_t pal[MAX_PALSIZE]; |
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uint8_t *cur, *prev; |
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uint8_t frm0[320 * 200], frm1[320 * 200]; |
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GetByteContext g; |
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} KmvcContext;
typedef struct BitBuf {
int bits;
int bitbuf;
} BitBuf;
|
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#define BLK(data, x, y) data[av_clip((x) + (y) * 320, 0, 320 * 200 -1)] |
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|
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#define kmvc_init_getbits(bb, g) bb.bits = 7; bb.bitbuf = bytestream2_get_byte(g); |
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|
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#define kmvc_getbit(bb, g, res) {\ |
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res = 0; \
if (bb.bitbuf & (1 << bb.bits)) res = 1; \
bb.bits--; \
if(bb.bits == -1) { \ |
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bb.bitbuf = bytestream2_get_byte(g); \ |
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bb.bits = 7; \
} \
}
|
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static int kmvc_decode_intra_8x8(KmvcContext * ctx, int w, int h) |
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{
BitBuf bb;
int res, val;
int i, j;
int bx, by;
int l0x, l1x, l0y, l1y;
int mx, my;
|
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kmvc_init_getbits(bb, &ctx->g); |
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for (by = 0; by < h; by += 8)
for (bx = 0; bx < w; bx += 8) { |
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if (!bytestream2_get_bytes_left(&ctx->g)) {
av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
return AVERROR_INVALIDDATA;
}
kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { // fill whole 8x8 block |
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val = bytestream2_get_byte(&ctx->g); |
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for (i = 0; i < 64; i++)
BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = val;
} else { // handle four 4x4 subblocks
for (i = 0; i < 4; i++) {
l0x = bx + (i & 1) * 4;
l0y = by + (i & 2) * 2; |
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kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { |
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kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { // fill whole 4x4 block |
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val = bytestream2_get_byte(&ctx->g); |
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for (j = 0; j < 16; j++)
BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = val;
} else { // copy block from already decoded place |
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val = bytestream2_get_byte(&ctx->g); |
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mx = val & 0xF;
my = val >> 4; |
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if ((l0x-mx) + 320*(l0y-my) < 0 || (l0x-mx) + 320*(l0y-my) > 320*197 - 4) { |
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av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
return AVERROR_INVALIDDATA;
} |
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for (j = 0; j < 16; j++)
BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) =
BLK(ctx->cur, l0x + (j & 3) - mx, l0y + (j >> 2) - my);
}
} else { // descend to 2x2 sub-sub-blocks
for (j = 0; j < 4; j++) {
l1x = l0x + (j & 1) * 2;
l1y = l0y + (j & 2); |
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kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { |
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kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { // fill whole 2x2 block |
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val = bytestream2_get_byte(&ctx->g); |
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BLK(ctx->cur, l1x, l1y) = val;
BLK(ctx->cur, l1x + 1, l1y) = val;
BLK(ctx->cur, l1x, l1y + 1) = val;
BLK(ctx->cur, l1x + 1, l1y + 1) = val;
} else { // copy block from already decoded place |
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val = bytestream2_get_byte(&ctx->g); |
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mx = val & 0xF;
my = val >> 4; |
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if ((l1x-mx) + 320*(l1y-my) < 0 || (l1x-mx) + 320*(l1y-my) > 320*199 - 2) { |
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av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
return AVERROR_INVALIDDATA;
} |
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BLK(ctx->cur, l1x, l1y) = BLK(ctx->cur, l1x - mx, l1y - my);
BLK(ctx->cur, l1x + 1, l1y) =
BLK(ctx->cur, l1x + 1 - mx, l1y - my);
BLK(ctx->cur, l1x, l1y + 1) =
BLK(ctx->cur, l1x - mx, l1y + 1 - my);
BLK(ctx->cur, l1x + 1, l1y + 1) =
BLK(ctx->cur, l1x + 1 - mx, l1y + 1 - my);
}
} else { // read values for block |
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BLK(ctx->cur, l1x, l1y) = bytestream2_get_byte(&ctx->g);
BLK(ctx->cur, l1x + 1, l1y) = bytestream2_get_byte(&ctx->g);
BLK(ctx->cur, l1x, l1y + 1) = bytestream2_get_byte(&ctx->g);
BLK(ctx->cur, l1x + 1, l1y + 1) = bytestream2_get_byte(&ctx->g); |
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}
}
}
}
}
} |
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return 0; |
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}
|
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static int kmvc_decode_inter_8x8(KmvcContext * ctx, int w, int h) |
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{
BitBuf bb;
int res, val;
int i, j;
int bx, by;
int l0x, l1x, l0y, l1y;
int mx, my;
|
da2e774f |
kmvc_init_getbits(bb, &ctx->g); |
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for (by = 0; by < h; by += 8)
for (bx = 0; bx < w; bx += 8) { |
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kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { |
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kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { // fill whole 8x8 block |
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if (!bytestream2_get_bytes_left(&ctx->g)) { |
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av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
return AVERROR_INVALIDDATA;
} |
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val = bytestream2_get_byte(&ctx->g); |
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for (i = 0; i < 64; i++)
BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = val;
} else { // copy block from previous frame
for (i = 0; i < 64; i++)
BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) =
BLK(ctx->prev, bx + (i & 0x7), by + (i >> 3));
}
} else { // handle four 4x4 subblocks |
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if (!bytestream2_get_bytes_left(&ctx->g)) {
av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
return AVERROR_INVALIDDATA;
} |
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for (i = 0; i < 4; i++) {
l0x = bx + (i & 1) * 4;
l0y = by + (i & 2) * 2; |
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kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { |
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kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { // fill whole 4x4 block |
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val = bytestream2_get_byte(&ctx->g); |
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for (j = 0; j < 16; j++)
BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = val;
} else { // copy block |
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val = bytestream2_get_byte(&ctx->g); |
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mx = (val & 0xF) - 8;
my = (val >> 4) - 8; |
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if ((l0x+mx) + 320*(l0y+my) < 0 || (l0x+mx) + 320*(l0y+my) > 320*197 - 4) { |
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av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
return AVERROR_INVALIDDATA;
} |
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for (j = 0; j < 16; j++)
BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) =
BLK(ctx->prev, l0x + (j & 3) + mx, l0y + (j >> 2) + my);
}
} else { // descend to 2x2 sub-sub-blocks
for (j = 0; j < 4; j++) {
l1x = l0x + (j & 1) * 2;
l1y = l0y + (j & 2); |
da2e774f |
kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { |
da2e774f |
kmvc_getbit(bb, &ctx->g, res); |
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if (!res) { // fill whole 2x2 block |
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val = bytestream2_get_byte(&ctx->g); |
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BLK(ctx->cur, l1x, l1y) = val;
BLK(ctx->cur, l1x + 1, l1y) = val;
BLK(ctx->cur, l1x, l1y + 1) = val;
BLK(ctx->cur, l1x + 1, l1y + 1) = val;
} else { // copy block |
da2e774f |
val = bytestream2_get_byte(&ctx->g); |
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mx = (val & 0xF) - 8;
my = (val >> 4) - 8; |
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if ((l1x+mx) + 320*(l1y+my) < 0 || (l1x+mx) + 320*(l1y+my) > 320*199 - 2) { |
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av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
return AVERROR_INVALIDDATA;
} |
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BLK(ctx->cur, l1x, l1y) = BLK(ctx->prev, l1x + mx, l1y + my);
BLK(ctx->cur, l1x + 1, l1y) =
BLK(ctx->prev, l1x + 1 + mx, l1y + my);
BLK(ctx->cur, l1x, l1y + 1) =
BLK(ctx->prev, l1x + mx, l1y + 1 + my);
BLK(ctx->cur, l1x + 1, l1y + 1) =
BLK(ctx->prev, l1x + 1 + mx, l1y + 1 + my);
}
} else { // read values for block |
da2e774f |
BLK(ctx->cur, l1x, l1y) = bytestream2_get_byte(&ctx->g);
BLK(ctx->cur, l1x + 1, l1y) = bytestream2_get_byte(&ctx->g);
BLK(ctx->cur, l1x, l1y + 1) = bytestream2_get_byte(&ctx->g);
BLK(ctx->cur, l1x + 1, l1y + 1) = bytestream2_get_byte(&ctx->g); |
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}
}
}
}
}
} |
ad3161ec |
return 0; |
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}
|
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static int decode_frame(AVCodecContext * avctx, void *data, int *got_frame,
AVPacket *avpkt) |
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{ |
e4141433 |
KmvcContext *const ctx = avctx->priv_data; |
759001c5 |
AVFrame *frame = data; |
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uint8_t *out, *src; |
e1a7061d |
int i, ret; |
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int header;
int blocksize; |
2d99101d |
int pal_size;
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size); |
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|
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bytestream2_init(&ctx->g, avpkt->data, avpkt->size); |
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|
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
445f36d7 |
return ret; |
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|
da2e774f |
header = bytestream2_get_byte(&ctx->g); |
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/* blocksize 127 is really palette change event */ |
da2e774f |
if (bytestream2_peek_byte(&ctx->g) == 127) {
bytestream2_skip(&ctx->g, 3); |
2d2b86c2 |
for (i = 0; i < 127; i++) { |
0e7fc3ca |
ctx->pal[i + (header & 0x81)] = 0xFFU << 24 | bytestream2_get_be24(&ctx->g); |
da2e774f |
bytestream2_skip(&ctx->g, 1); |
2d2b86c2 |
} |
da2e774f |
bytestream2_seek(&ctx->g, -127 * 4 - 3, SEEK_CUR); |
2d2b86c2 |
} |
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if (header & KMVC_KEYFRAME) { |
759001c5 |
frame->key_frame = 1;
frame->pict_type = AV_PICTURE_TYPE_I; |
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} else { |
759001c5 |
frame->key_frame = 0;
frame->pict_type = AV_PICTURE_TYPE_P; |
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}
if (header & KMVC_PALETTE) { |
759001c5 |
frame->palette_has_changed = 1; |
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// palette starts from index 1 and has 127 entries
for (i = 1; i <= ctx->palsize; i++) { |
0e7fc3ca |
ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&ctx->g); |
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}
}
|
2d99101d |
if (pal && pal_size == AVPALETTE_SIZE) { |
759001c5 |
frame->palette_has_changed = 1; |
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memcpy(ctx->pal, pal, AVPALETTE_SIZE); |
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} else if (pal) {
av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", pal_size); |
2d8591c2 |
}
|
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if (ctx->setpal) {
ctx->setpal = 0; |
759001c5 |
frame->palette_has_changed = 1; |
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}
/* make the palette available on the way out */ |
759001c5 |
memcpy(frame->data[1], ctx->pal, 1024); |
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|
da2e774f |
blocksize = bytestream2_get_byte(&ctx->g); |
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|
2d2b86c2 |
if (blocksize != 8 && blocksize != 127) { |
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av_log(avctx, AV_LOG_ERROR, "Block size = %i\n", blocksize); |
445f36d7 |
return AVERROR_INVALIDDATA; |
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}
memset(ctx->cur, 0, 320 * 200);
switch (header & KMVC_METHOD) { |
2d2b86c2 |
case 0:
case 1: // used in palette changed event
memcpy(ctx->cur, ctx->prev, 320 * 200);
break; |
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case 3: |
da2e774f |
kmvc_decode_intra_8x8(ctx, avctx->width, avctx->height); |
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break;
case 4: |
da2e774f |
kmvc_decode_inter_8x8(ctx, avctx->width, avctx->height); |
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break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown compression method %i\n", header & KMVC_METHOD); |
445f36d7 |
return AVERROR_INVALIDDATA; |
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}
|
759001c5 |
out = frame->data[0]; |
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src = ctx->cur;
for (i = 0; i < avctx->height; i++) {
memcpy(out, src, avctx->width);
src += 320; |
759001c5 |
out += frame->linesize[0]; |
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}
/* flip buffers */
if (ctx->cur == ctx->frm0) {
ctx->cur = ctx->frm1;
ctx->prev = ctx->frm0;
} else {
ctx->cur = ctx->frm0;
ctx->prev = ctx->frm1;
}
|
df9b9567 |
*got_frame = 1; |
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/* always report that the buffer was completely consumed */ |
da2e774f |
return avpkt->size; |
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}
/*
* Init kmvc decoder
*/ |
98a6fff9 |
static av_cold int decode_init(AVCodecContext * avctx) |
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{ |
e4141433 |
KmvcContext *const c = avctx->priv_data; |
fd7b1991 |
int i;
c->avctx = avctx;
if (avctx->width > 320 || avctx->height > 200) {
av_log(avctx, AV_LOG_ERROR, "KMVC supports frames <= 320x200\n"); |
e1a7061d |
return AVERROR(EINVAL); |
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}
c->cur = c->frm0;
c->prev = c->frm1;
for (i = 0; i < 256; i++) { |
b12d92ef |
c->pal[i] = 0xFFU << 24 | i * 0x10101; |
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}
if (avctx->extradata_size < 12) { |
ae35210a |
av_log(avctx, AV_LOG_WARNING,
"Extradata missing, decoding may not work properly...\n"); |
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c->palsize = 127;
} else { |
fead30d4 |
c->palsize = AV_RL16(avctx->extradata + 10); |
151ecc2a |
if (c->palsize >= (unsigned)MAX_PALSIZE) { |
70dba1e3 |
c->palsize = 127; |
386741f8 |
av_log(avctx, AV_LOG_ERROR, "KMVC palette too large\n");
return AVERROR_INVALIDDATA; |
70dba1e3 |
} |
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}
if (avctx->extradata_size == 1036) { // palette in extradata
uint8_t *src = avctx->extradata + 12; |
2d2b86c2 |
for (i = 0; i < 256; i++) { |
fead30d4 |
c->pal[i] = AV_RL32(src); |
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src += 4;
}
c->setpal = 1;
}
|
716d413c |
avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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return 0;
}
|
e7e2df27 |
AVCodec ff_kmvc_decoder = { |
ec6402b7 |
.name = "kmvc", |
b2bed932 |
.long_name = NULL_IF_CONFIG_SMALL("Karl Morton's video codec"), |
ec6402b7 |
.type = AVMEDIA_TYPE_VIDEO, |
36ef5369 |
.id = AV_CODEC_ID_KMVC, |
ec6402b7 |
.priv_data_size = sizeof(KmvcContext),
.init = decode_init,
.decode = decode_frame, |
def97856 |
.capabilities = AV_CODEC_CAP_DR1, |
fd7b1991 |
}; |