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/*
* 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 "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.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, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
TrueMotion2RTContext *s = avctx->priv_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];
}
*got_frame = 1;
return avpkt->size;
}
static av_cold int truemotion2rt_decode_init(AVCodecContext *avctx)
{
avctx->pix_fmt = AV_PIX_FMT_YUV410P;
return 0;
}
const FFCodec ff_truemotion2rt_decoder = {
.p.name = "truemotion2rt",
CODEC_LONG_NAME("Duck TrueMotion 2.0 Real Time"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_TRUEMOTION2RT,
.priv_data_size = sizeof(TrueMotion2RTContext),
.init = truemotion2rt_decode_init,
FF_CODEC_DECODE_CB(truemotion2rt_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
};
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