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