0,0 → 1,186 |
/* |
* AVS video decoder. |
* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> |
* |
* 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 "avcodec.h" |
#include "get_bits.h" |
#include "internal.h" |
|
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typedef struct { |
AVFrame picture; |
} AvsContext; |
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typedef enum { |
AVS_VIDEO = 0x01, |
AVS_AUDIO = 0x02, |
AVS_PALETTE = 0x03, |
AVS_GAME_DATA = 0x04, |
} AvsBlockType; |
|
typedef enum { |
AVS_I_FRAME = 0x00, |
AVS_P_FRAME_3X3 = 0x01, |
AVS_P_FRAME_2X2 = 0x02, |
AVS_P_FRAME_2X3 = 0x03, |
} AvsVideoSubType; |
|
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static int |
avs_decode_frame(AVCodecContext * avctx, |
void *data, int *got_frame, AVPacket *avpkt) |
{ |
const uint8_t *buf = avpkt->data; |
const uint8_t *buf_end = avpkt->data + avpkt->size; |
int buf_size = avpkt->size; |
AvsContext *const avs = avctx->priv_data; |
AVFrame *picture = data; |
AVFrame *const p = &avs->picture; |
const uint8_t *table, *vect; |
uint8_t *out; |
int i, j, x, y, stride, ret, vect_w = 3, vect_h = 3; |
AvsVideoSubType sub_type; |
AvsBlockType type; |
GetBitContext change_map = {0}; //init to silence warning |
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if ((ret = ff_reget_buffer(avctx, p)) < 0) |
return ret; |
p->pict_type = AV_PICTURE_TYPE_P; |
p->key_frame = 0; |
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out = avs->picture.data[0]; |
stride = avs->picture.linesize[0]; |
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if (buf_end - buf < 4) |
return AVERROR_INVALIDDATA; |
sub_type = buf[0]; |
type = buf[1]; |
buf += 4; |
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if (type == AVS_PALETTE) { |
int first, last; |
uint32_t *pal = (uint32_t *) avs->picture.data[1]; |
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first = AV_RL16(buf); |
last = first + AV_RL16(buf + 2); |
if (first >= 256 || last > 256 || buf_end - buf < 4 + 4 + 3 * (last - first)) |
return AVERROR_INVALIDDATA; |
buf += 4; |
for (i=first; i<last; i++, buf+=3) { |
pal[i] = (buf[0] << 18) | (buf[1] << 10) | (buf[2] << 2); |
pal[i] |= 0xFFU << 24 | (pal[i] >> 6) & 0x30303; |
} |
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sub_type = buf[0]; |
type = buf[1]; |
buf += 4; |
} |
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if (type != AVS_VIDEO) |
return AVERROR_INVALIDDATA; |
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switch (sub_type) { |
case AVS_I_FRAME: |
p->pict_type = AV_PICTURE_TYPE_I; |
p->key_frame = 1; |
case AVS_P_FRAME_3X3: |
vect_w = 3; |
vect_h = 3; |
break; |
|
case AVS_P_FRAME_2X2: |
vect_w = 2; |
vect_h = 2; |
break; |
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case AVS_P_FRAME_2X3: |
vect_w = 2; |
vect_h = 3; |
break; |
|
default: |
return AVERROR_INVALIDDATA; |
} |
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if (buf_end - buf < 256 * vect_w * vect_h) |
return AVERROR_INVALIDDATA; |
table = buf + (256 * vect_w * vect_h); |
if (sub_type != AVS_I_FRAME) { |
int map_size = ((318 / vect_w + 7) / 8) * (198 / vect_h); |
if (buf_end - table < map_size) |
return AVERROR_INVALIDDATA; |
init_get_bits(&change_map, table, map_size * 8); |
table += map_size; |
} |
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for (y=0; y<198; y+=vect_h) { |
for (x=0; x<318; x+=vect_w) { |
if (sub_type == AVS_I_FRAME || get_bits1(&change_map)) { |
if (buf_end - table < 1) |
return AVERROR_INVALIDDATA; |
vect = &buf[*table++ * (vect_w * vect_h)]; |
for (j=0; j<vect_w; j++) { |
out[(y + 0) * stride + x + j] = vect[(0 * vect_w) + j]; |
out[(y + 1) * stride + x + j] = vect[(1 * vect_w) + j]; |
if (vect_h == 3) |
out[(y + 2) * stride + x + j] = |
vect[(2 * vect_w) + j]; |
} |
} |
} |
if (sub_type != AVS_I_FRAME) |
align_get_bits(&change_map); |
} |
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if ((ret = av_frame_ref(picture, &avs->picture)) < 0) |
return ret; |
*got_frame = 1; |
|
return buf_size; |
} |
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static av_cold int avs_decode_init(AVCodecContext * avctx) |
{ |
AvsContext *s = avctx->priv_data; |
avctx->pix_fmt = AV_PIX_FMT_PAL8; |
avcodec_set_dimensions(avctx, 318, 198); |
avcodec_get_frame_defaults(&s->picture); |
return 0; |
} |
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static av_cold int avs_decode_end(AVCodecContext *avctx) |
{ |
AvsContext *s = avctx->priv_data; |
av_frame_unref(&s->picture); |
return 0; |
} |
|
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AVCodec ff_avs_decoder = { |
.name = "avs", |
.long_name = NULL_IF_CONFIG_SMALL("AVS (Audio Video Standard) video"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_AVS, |
.priv_data_size = sizeof(AvsContext), |
.init = avs_decode_init, |
.decode = avs_decode_frame, |
.close = avs_decode_end, |
.capabilities = CODEC_CAP_DR1, |
}; |