mirror of
https://github.com/FFmpeg/FFmpeg.git
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c85d04251d
Signed-off-by: Paul B Mahol <onemda@gmail.com>
221 lines
6.4 KiB
C
221 lines
6.4 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "avcodec.h"
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#define BITSTREAM_READER_LE
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#include "get_bits.h"
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#include "internal.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mem.h"
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typedef struct TrueMotion2RTContext {
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GetBitContext gb;
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const uint8_t *buf;
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int size;
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int delta_size;
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int hscale;
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} TrueMotion2RTContext;
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static av_cold int 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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/* Returns the number of bytes consumed from the bytestream. Returns -1 if
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* there was an error while decoding the header */
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static int truemotion2rt_decode_header(AVCodecContext *avctx)
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{
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TrueMotion2RTContext *s = avctx->priv_data;
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uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */
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int i, header_size;
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header_size = ((s->buf[0] >> 5) | (s->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 > s->size) {
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av_log(avctx, AV_LOG_ERROR, "Input packet too small.\n");
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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] = s->buf[i] ^ s->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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avctx->height = AV_RL16(header_buffer + 5);
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avctx->width = AV_RL16(header_buffer + 7);
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return header_size;
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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 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_tab2[] = {
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5, -7, 36, -36
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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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static int decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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TrueMotion2RTContext *s = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int ret, buf_size = avpkt->size;
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AVFrame * const p = 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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s->buf = buf;
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s->size = buf_size;
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if ((ret = truemotion2rt_decode_header(avctx)) < 0)
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return ret;
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if ((ret = init_get_bits8(gb, buf + ret, buf_size - ret)) < 0)
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return ret;
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if ((ret = ff_get_buffer(avctx, p, 0)) < 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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}
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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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}
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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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}
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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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*got_frame = 1;
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return buf_size;
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}
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AVCodec ff_truemotion2rt_decoder = {
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.name = "truemotion2rt",
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.long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0 Real Time"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_TRUEMOTION2RT,
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.priv_data_size = sizeof(TrueMotion2RTContext),
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.init = decode_init,
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.decode = decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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