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/*
* Bitmap Brothers JV video decoder
* Copyright (c) 2011 Peter Ross <pross@xvid.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
*/
/**
* @file
* Bitmap Brothers JV video decoder
* @author Peter Ross <pross@xvid.org>
*/
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#include "libavutil/intreadwrite.h"
|
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#include "avcodec.h"
#include "dsputil.h"
#include "get_bits.h" |
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#include "internal.h" |
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typedef struct JvContext {
DSPContext dsp; |
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AVFrame *frame; |
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uint32_t palette[AVPALETTE_COUNT];
int palette_has_changed;
} JvContext;
static av_cold int decode_init(AVCodecContext *avctx)
{
JvContext *s = avctx->priv_data; |
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|
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s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM); |
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|
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avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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ff_dsputil_init(&s->dsp, avctx); |
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return 0;
}
/**
* Decode 2x2 block
*/
static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
{
int i, j, v[2];
switch (get_bits(gb, 2)) {
case 1:
v[0] = get_bits(gb, 8);
for (j = 0; j < 2; j++) |
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memset(dst + j * linesize, v[0], 2); |
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break;
case 2:
v[0] = get_bits(gb, 8);
v[1] = get_bits(gb, 8);
for (j = 0; j < 2; j++)
for (i = 0; i < 2; i++) |
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dst[j * linesize + i] = v[get_bits1(gb)]; |
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break;
case 3:
for (j = 0; j < 2; j++)
for (i = 0; i < 2; i++) |
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dst[j * linesize + i] = get_bits(gb, 8); |
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}
}
/**
* Decode 4x4 block
*/
static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
{
int i, j, v[2];
switch (get_bits(gb, 2)) {
case 1:
v[0] = get_bits(gb, 8);
for (j = 0; j < 4; j++) |
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memset(dst + j * linesize, v[0], 4); |
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break;
case 2:
v[0] = get_bits(gb, 8);
v[1] = get_bits(gb, 8);
for (j = 2; j >= 0; j -= 2) {
for (i = 0; i < 4; i++) |
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dst[j * linesize + i] = v[get_bits1(gb)]; |
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for (i = 0; i < 4; i++) |
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dst[(j + 1) * linesize + i] = v[get_bits1(gb)]; |
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}
break;
case 3:
for (j = 0; j < 4; j += 2)
for (i = 0; i < 4; i += 2) |
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decode2x2(gb, dst + j * linesize + i, linesize); |
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}
}
/**
* Decode 8x8 block
*/ |
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static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
DSPContext *dsp) |
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{
int i, j, v[2];
switch (get_bits(gb, 2)) {
case 1:
v[0] = get_bits(gb, 8);
dsp->fill_block_tab[1](dst, v[0], linesize, 8);
break;
case 2:
v[0] = get_bits(gb, 8);
v[1] = get_bits(gb, 8);
for (j = 7; j >= 0; j--) |
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for (i = 0; i < 8; i++)
dst[j * linesize + i] = v[get_bits1(gb)]; |
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break;
case 3:
for (j = 0; j < 8; j += 4)
for (i = 0; i < 8; i += 4) |
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decode4x4(gb, dst + j * linesize + i, linesize); |
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}
}
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
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AVPacket *avpkt)
{ |
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JvContext *s = avctx->priv_data;
const uint8_t *buf = avpkt->data; |
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const uint8_t *buf_end = buf + avpkt->size; |
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int video_size, video_type, i, j, ret; |
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|
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if (avpkt->size < 6)
return AVERROR_INVALIDDATA;
|
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video_size = AV_RL32(buf);
video_type = buf[4];
buf += 5;
if (video_size) { |
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if (video_size < 0 || video_size > avpkt->size - 5) { |
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av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
return AVERROR_INVALIDDATA;
} |
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if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
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return ret; |
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if (video_type == 0 || video_type == 1) {
GetBitContext gb; |
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init_get_bits(&gb, buf, 8 * video_size); |
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for (j = 0; j < avctx->height; j += 8)
for (i = 0; i < avctx->width; i += 8) |
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decode8x8(&gb,
s->frame->data[0] + j * s->frame->linesize[0] + i, |
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s->frame->linesize[0], &s->dsp); |
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buf += video_size;
} else if (video_type == 2) { |
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int v = *buf++;
for (j = 0; j < avctx->height; j++) |
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memset(s->frame->data[0] + j * s->frame->linesize[0],
v, avctx->width); |
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} else { |
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av_log(avctx, AV_LOG_WARNING,
"unsupported frame type %i\n", video_type); |
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return AVERROR_INVALIDDATA;
}
}
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if (buf_end - buf >= AVPALETTE_COUNT * 3) {
for (i = 0; i < AVPALETTE_COUNT; i++) { |
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uint32_t pal = AV_RB24(buf); |
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s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303); |
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buf += 3;
}
s->palette_has_changed = 1;
}
if (video_size) { |
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s->frame->key_frame = 1;
s->frame->pict_type = AV_PICTURE_TYPE_I;
s->frame->palette_has_changed = s->palette_has_changed; |
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s->palette_has_changed = 0; |
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memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE); |
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|
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if ((ret = av_frame_ref(data, s->frame)) < 0) |
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return ret; |
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*got_frame = 1; |
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}
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return avpkt->size; |
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}
static av_cold int decode_close(AVCodecContext *avctx)
{
JvContext *s = avctx->priv_data;
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av_frame_free(&s->frame); |
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return 0;
}
AVCodec ff_jv_decoder = {
.name = "jv",
.long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_JV, |
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.priv_data_size = sizeof(JvContext),
.init = decode_init,
.close = decode_close,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
}; |