233 lines
6.9 KiB
C
Executable file
233 lines
6.9 KiB
C
Executable file
/*
|
|
* Duck TrueMotion 2.0 Real Time decoder
|
|
*
|
|
* 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 <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "libavutil/imgutils.h"
|
|
#include "libavutil/internal.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/mem.h"
|
|
|
|
#define BITSTREAM_READER_LE
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
#include "internal.h"
|
|
|
|
typedef struct TrueMotion2RTContext {
|
|
GetBitContext gb;
|
|
int delta_size;
|
|
int hscale;
|
|
} TrueMotion2RTContext;
|
|
|
|
static const int16_t delta_tab2[] = {
|
|
5, -7, 36, -36,
|
|
};
|
|
|
|
static const int16_t delta_tab3[] = {
|
|
2, -3, 8, -8, 18, -18, 36, -36,
|
|
};
|
|
|
|
static const int16_t delta_tab4[] = {
|
|
1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144,
|
|
};
|
|
|
|
static const int16_t *const delta_tabs[] = {
|
|
delta_tab2, delta_tab3, delta_tab4,
|
|
};
|
|
|
|
/* Returns the number of bytes consumed from the bytestream, or
|
|
* AVERROR_INVALIDDATA if there was an error while decoding the header. */
|
|
static int truemotion2rt_decode_header(AVCodecContext *avctx, const AVPacket *avpkt)
|
|
{
|
|
TrueMotion2RTContext *s = avctx->priv_data;
|
|
int header_size;
|
|
uint8_t header_buffer[128] = { 0 }; /* logical maximum header size */
|
|
const uint8_t *buf = avpkt->data;
|
|
int size = avpkt->size;
|
|
int width, height;
|
|
int ret, i;
|
|
|
|
if (size < 1) {
|
|
av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
header_size = ((buf[0] >> 5) | (buf[0] << 3)) & 0x7f;
|
|
if (header_size < 10) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid header size (%d)\n", header_size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (header_size + 1 > size) {
|
|
av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* unscramble the header bytes with a XOR operation */
|
|
for (i = 1; i < header_size; i++)
|
|
header_buffer[i - 1] = buf[i] ^ buf[i + 1];
|
|
|
|
s->delta_size = header_buffer[1];
|
|
s->hscale = 1 + !!header_buffer[3];
|
|
if (s->delta_size < 2 || s->delta_size > 4)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
height = AV_RL16(header_buffer + 5);
|
|
width = AV_RL16(header_buffer + 7);
|
|
|
|
ret = ff_set_dimensions(avctx, width, height);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
av_log(avctx, AV_LOG_DEBUG, "Header size: %d\n", header_size);
|
|
return header_size;
|
|
}
|
|
|
|
static int truemotion2rt_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
TrueMotion2RTContext *s = avctx->priv_data;
|
|
AVFrame * const p = data;
|
|
GetBitContext *gb = &s->gb;
|
|
uint8_t *dst;
|
|
int x, y, delta_mode;
|
|
int ret;
|
|
|
|
ret = truemotion2rt_decode_header(avctx, avpkt);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if ((avctx->width + s->hscale - 1)/ s->hscale * avctx->height * s->delta_size > avpkt->size * 8LL * 4)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
ret = init_get_bits8(gb, avpkt->data + ret, avpkt->size - ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = ff_get_buffer(avctx, p, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
skip_bits(gb, 32);
|
|
delta_mode = s->delta_size - 2;
|
|
dst = p->data[0];
|
|
for (y = 0; y < avctx->height; y++) {
|
|
int diff = 0;
|
|
for (x = 0; x < avctx->width; x += s->hscale) {
|
|
diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
|
|
dst[x] = av_clip_uint8((y ? dst[x - p->linesize[0]] : 0) + diff);
|
|
}
|
|
dst += p->linesize[0];
|
|
}
|
|
|
|
if (s->hscale > 1) {
|
|
dst = p->data[0];
|
|
for (y = 0; y < avctx->height; y++) {
|
|
for (x = 1; x < avctx->width; x += s->hscale)
|
|
dst[x] = dst[x - 1];
|
|
dst += p->linesize[0];
|
|
}
|
|
}
|
|
|
|
dst = p->data[0];
|
|
for (y = 0; y < avctx->height; y++) {
|
|
for (x = 0; x < avctx->width; x++)
|
|
dst[x] = av_clip_uint8(dst[x] + (dst[x] - 128) / 3);
|
|
dst += p->linesize[0];
|
|
}
|
|
|
|
dst = p->data[1];
|
|
for (y = 0; y < avctx->height >> 2; y++) {
|
|
int diff = 0;
|
|
for (x = 0; x < avctx->width >> 2; x += s->hscale) {
|
|
diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
|
|
dst[x] = av_clip_uint8((y ? dst[x - p->linesize[1]] : 128) + diff);
|
|
}
|
|
dst += p->linesize[1];
|
|
}
|
|
|
|
if (s->hscale > 1) {
|
|
dst = p->data[1];
|
|
for (y = 0; y < avctx->height >> 2; y++) {
|
|
for (x = 1; x < avctx->width >> 2; x += s->hscale)
|
|
dst[x] = dst[x - 1];
|
|
dst += p->linesize[1];
|
|
}
|
|
}
|
|
|
|
dst = p->data[1];
|
|
for (y = 0; y < avctx->height >> 2; y++) {
|
|
for (x = 0; x < avctx->width >> 2; x++)
|
|
dst[x] += (dst[x] - 128) / 8;
|
|
dst += p->linesize[1];
|
|
}
|
|
|
|
dst = p->data[2];
|
|
for (y = 0; y < avctx->height >> 2; y++) {
|
|
int diff = 0;
|
|
for (x = 0; x < avctx->width >> 2; x += s->hscale) {
|
|
diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
|
|
dst[x] = av_clip_uint8((y ? dst[x - p->linesize[2]] : 128) + diff);
|
|
}
|
|
dst += p->linesize[2];
|
|
}
|
|
|
|
if (s->hscale > 1) {
|
|
dst = p->data[2];
|
|
for (y = 0; y < avctx->height >> 2; y++) {
|
|
for (x = 1; x < avctx->width >> 2; x += s->hscale)
|
|
dst[x] = dst[x - 1];
|
|
dst += p->linesize[2];
|
|
}
|
|
}
|
|
|
|
dst = p->data[2];
|
|
for (y = 0; y < avctx->height >> 2; y++) {
|
|
for (x = 0; x < avctx->width >> 2; x++)
|
|
dst[x] += (dst[x] - 128) / 8;
|
|
dst += p->linesize[2];
|
|
}
|
|
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
p->key_frame = 1;
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int truemotion2rt_decode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV410P;
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_truemotion2rt_decoder = {
|
|
.name = "truemotion2rt",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0 Real Time"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_TRUEMOTION2RT,
|
|
.priv_data_size = sizeof(TrueMotion2RTContext),
|
|
.init = truemotion2rt_decode_init,
|
|
.decode = truemotion2rt_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
|
|
};
|