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| 1 | +/* |
| 2 | + * Duck TrueMotion 2.0 Real Time Decoder |
| 3 | + * |
| 4 | + * This file is part of FFmpeg. |
| 5 | + * |
| 6 | + * FFmpeg is free software; you can redistribute it and/or |
| 7 | + * modify it under the terms of the GNU Lesser General Public |
| 8 | + * License as published by the Free Software Foundation; either |
| 9 | + * version 2.1 of the License, or (at your option) any later version. |
| 10 | + * |
| 11 | + * FFmpeg is distributed in the hope that it will be useful, |
| 12 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | + * Lesser General Public License for more details. |
| 15 | + * |
| 16 | + * You should have received a copy of the GNU Lesser General Public |
| 17 | + * License along with FFmpeg; if not, write to the Free Software |
| 18 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | + */ |
| 20 | + |
| 21 | +#include <stdio.h> |
| 22 | +#include <stdlib.h> |
| 23 | +#include <string.h> |
| 24 | + |
| 25 | +#include "avcodec.h" |
| 26 | +#define BITSTREAM_READER_LE |
| 27 | +#include "get_bits.h" |
| 28 | +#include "internal.h" |
| 29 | +#include "libavutil/imgutils.h" |
| 30 | +#include "libavutil/internal.h" |
| 31 | +#include "libavutil/intreadwrite.h" |
| 32 | +#include "libavutil/mem.h" |
| 33 | + |
| 34 | +typedef struct TrueMotion2RTContext { |
| 35 | + GetBitContext gb; |
| 36 | + const uint8_t *buf; |
| 37 | + int size; |
| 38 | + int delta_size; |
| 39 | + int hscale; |
| 40 | +} TrueMotion2RTContext; |
| 41 | + |
| 42 | +static av_cold int decode_init(AVCodecContext *avctx) |
| 43 | +{ |
| 44 | + avctx->pix_fmt = AV_PIX_FMT_YUV410P; |
| 45 | + return 0; |
| 46 | +} |
| 47 | + |
| 48 | +/* Returns the number of bytes consumed from the bytestream. Returns -1 if |
| 49 | + * there was an error while decoding the header */ |
| 50 | +static int truemotion2rt_decode_header(AVCodecContext *avctx) |
| 51 | +{ |
| 52 | + TrueMotion2RTContext *s = avctx->priv_data; |
| 53 | + uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */ |
| 54 | + int i, header_size; |
| 55 | + |
| 56 | + header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f; |
| 57 | + if (header_size < 10) { |
| 58 | + av_log(avctx, AV_LOG_ERROR, "invalid header size (%d)\n", header_size); |
| 59 | + return AVERROR_INVALIDDATA; |
| 60 | + } |
| 61 | + |
| 62 | + if (header_size + 1 > s->size) { |
| 63 | + av_log(avctx, AV_LOG_ERROR, "Input packet too small.\n"); |
| 64 | + return AVERROR_INVALIDDATA; |
| 65 | + } |
| 66 | + |
| 67 | + /* unscramble the header bytes with a XOR operation */ |
| 68 | + for (i = 1; i < header_size; i++) |
| 69 | + header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1]; |
| 70 | + |
| 71 | + s->delta_size = header_buffer[1]; |
| 72 | + s->hscale = 1 + !!header_buffer[3]; |
| 73 | + if (s->delta_size < 2 || s->delta_size > 4) |
| 74 | + return AVERROR_INVALIDDATA; |
| 75 | + |
| 76 | + avctx->height = AV_RL16(header_buffer + 5); |
| 77 | + avctx->width = AV_RL16(header_buffer + 7); |
| 78 | + |
| 79 | + return header_size; |
| 80 | +} |
| 81 | + |
| 82 | +static const int16_t delta_tab4[] = { |
| 83 | + 1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144 |
| 84 | +}; |
| 85 | + |
| 86 | +static const int16_t delta_tab3[] = { |
| 87 | + 2, -3, 8, -8, 18, -18, 36, -36 |
| 88 | +}; |
| 89 | + |
| 90 | +static const int16_t delta_tab2[] = { |
| 91 | + 5, -7, 36, -36 |
| 92 | +}; |
| 93 | + |
| 94 | +static const int16_t *const delta_tabs[] = { |
| 95 | + delta_tab2, delta_tab3, delta_tab4, |
| 96 | +}; |
| 97 | + |
| 98 | +static int decode_frame(AVCodecContext *avctx, |
| 99 | + void *data, int *got_frame, |
| 100 | + AVPacket *avpkt) |
| 101 | +{ |
| 102 | + TrueMotion2RTContext *s = avctx->priv_data; |
| 103 | + const uint8_t *buf = avpkt->data; |
| 104 | + int ret, buf_size = avpkt->size; |
| 105 | + AVFrame * const p = data; |
| 106 | + GetBitContext *gb = &s->gb; |
| 107 | + uint8_t *dst; |
| 108 | + int x, y, delta_mode; |
| 109 | + |
| 110 | + s->buf = buf; |
| 111 | + s->size = buf_size; |
| 112 | + |
| 113 | + if ((ret = truemotion2rt_decode_header(avctx)) < 0) |
| 114 | + return ret; |
| 115 | + |
| 116 | + if ((ret = init_get_bits8(gb, buf + ret, buf_size - ret)) < 0) |
| 117 | + return ret; |
| 118 | + |
| 119 | + if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| 120 | + return ret; |
| 121 | + |
| 122 | + skip_bits(gb, 32); |
| 123 | + delta_mode = s->delta_size - 2; |
| 124 | + dst = p->data[0]; |
| 125 | + for (y = 0; y < avctx->height; y++) { |
| 126 | + int diff = 0; |
| 127 | + for (x = 0; x < avctx->width; x += s->hscale) { |
| 128 | + diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)]; |
| 129 | + dst[x] = av_clip_uint8((y ? dst[x - p->linesize[0]] : 0) + diff); |
| 130 | + } |
| 131 | + dst += p->linesize[0]; |
| 132 | + } |
| 133 | + |
| 134 | + if (s->hscale > 1) { |
| 135 | + dst = p->data[0]; |
| 136 | + for (y = 0; y < avctx->height; y++) { |
| 137 | + for (x = 1; x < avctx->width; x += s->hscale) { |
| 138 | + dst[x] = dst[x - 1]; |
| 139 | + } |
| 140 | + dst += p->linesize[0]; |
| 141 | + } |
| 142 | + } |
| 143 | + |
| 144 | + dst = p->data[0]; |
| 145 | + for (y = 0; y < avctx->height; y++) { |
| 146 | + for (x = 0; x < avctx->width; x++) |
| 147 | + dst[x] = av_clip_uint8(dst[x] + (dst[x] - 128) / 3); |
| 148 | + dst += p->linesize[0]; |
| 149 | + } |
| 150 | + |
| 151 | + dst = p->data[1]; |
| 152 | + for (y = 0; y < avctx->height >> 2; y++) { |
| 153 | + int diff = 0; |
| 154 | + for (x = 0; x < avctx->width >> 2; x += s->hscale) { |
| 155 | + diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)]; |
| 156 | + dst[x] = av_clip_uint8((y ? dst[x - p->linesize[1]] : 128) + diff); |
| 157 | + } |
| 158 | + dst += p->linesize[1]; |
| 159 | + } |
| 160 | + |
| 161 | + if (s->hscale > 1) { |
| 162 | + dst = p->data[1]; |
| 163 | + for (y = 0; y < avctx->height >> 2; y++) { |
| 164 | + for (x = 1; x < avctx->width >> 2; x += s->hscale) { |
| 165 | + dst[x] = dst[x - 1]; |
| 166 | + } |
| 167 | + dst += p->linesize[1]; |
| 168 | + } |
| 169 | + } |
| 170 | + |
| 171 | + dst = p->data[1]; |
| 172 | + for (y = 0; y < avctx->height >> 2; y++) { |
| 173 | + for (x = 0; x < avctx->width >> 2; x++) |
| 174 | + dst[x] += (dst[x] - 128) / 8; |
| 175 | + dst += p->linesize[1]; |
| 176 | + } |
| 177 | + |
| 178 | + dst = p->data[2]; |
| 179 | + for (y = 0; y < avctx->height >> 2; y++) { |
| 180 | + int diff = 0; |
| 181 | + for (x = 0; x < avctx->width >> 2; x += s->hscale) { |
| 182 | + diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)]; |
| 183 | + dst[x] = av_clip_uint8((y ? dst[x - p->linesize[2]] : 128) + diff); |
| 184 | + } |
| 185 | + dst += p->linesize[2]; |
| 186 | + } |
| 187 | + |
| 188 | + if (s->hscale > 1) { |
| 189 | + dst = p->data[2]; |
| 190 | + for (y = 0; y < avctx->height >> 2; y++) { |
| 191 | + for (x = 1; x < avctx->width >> 2; x += s->hscale) { |
| 192 | + dst[x] = dst[x - 1]; |
| 193 | + } |
| 194 | + dst += p->linesize[2]; |
| 195 | + } |
| 196 | + } |
| 197 | + |
| 198 | + dst = p->data[2]; |
| 199 | + for (y = 0; y < avctx->height >> 2; y++) { |
| 200 | + for (x = 0; x < avctx->width >> 2; x++) |
| 201 | + dst[x] += (dst[x] - 128) / 8; |
| 202 | + dst += p->linesize[2]; |
| 203 | + } |
| 204 | + |
| 205 | + p->pict_type = AV_PICTURE_TYPE_I; |
| 206 | + *got_frame = 1; |
| 207 | + |
| 208 | + return buf_size; |
| 209 | +} |
| 210 | + |
| 211 | +AVCodec ff_truemotion2rt_decoder = { |
| 212 | + .name = "truemotion2rt", |
| 213 | + .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0 Real Time"), |
| 214 | + .type = AVMEDIA_TYPE_VIDEO, |
| 215 | + .id = AV_CODEC_ID_TRUEMOTION2RT, |
| 216 | + .priv_data_size = sizeof(TrueMotion2RTContext), |
| 217 | + .init = decode_init, |
| 218 | + .decode = decode_frame, |
| 219 | + .capabilities = AV_CODEC_CAP_DR1, |
| 220 | +}; |