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00023 #include "avcodec.h"
00024 #include "libavutil/intreadwrite.h"
00025 #include "bytestream.h"
00026
00027 #include "libavutil/imgutils.h"
00028 #include "libavutil/lzo.h"
00029
00030 typedef struct DfaContext {
00031 AVFrame pic;
00032
00033 uint32_t pal[256];
00034 uint8_t *frame_buf;
00035 } DfaContext;
00036
00037 static av_cold int dfa_decode_init(AVCodecContext *avctx)
00038 {
00039 DfaContext *s = avctx->priv_data;
00040 int ret;
00041
00042 avctx->pix_fmt = PIX_FMT_PAL8;
00043
00044 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
00045 return ret;
00046
00047 s->frame_buf = av_mallocz(avctx->width * avctx->height + AV_LZO_OUTPUT_PADDING);
00048 if (!s->frame_buf)
00049 return AVERROR(ENOMEM);
00050
00051 return 0;
00052 }
00053
00054 static int decode_copy(uint8_t *frame, int width, int height,
00055 const uint8_t *src, const uint8_t *src_end)
00056 {
00057 const int size = width * height;
00058
00059 if (src_end - src < size)
00060 return -1;
00061 bytestream_get_buffer(&src, frame, size);
00062 return 0;
00063 }
00064
00065 static int decode_tsw1(uint8_t *frame, int width, int height,
00066 const uint8_t *src, const uint8_t *src_end)
00067 {
00068 const uint8_t *frame_start = frame;
00069 const uint8_t *frame_end = frame + width * height;
00070 int mask = 0x10000, bitbuf = 0;
00071 int v, count, segments;
00072 unsigned offset;
00073
00074 segments = bytestream_get_le32(&src);
00075 offset = bytestream_get_le32(&src);
00076 if (frame_end - frame <= offset)
00077 return -1;
00078 frame += offset;
00079 while (segments--) {
00080 if (mask == 0x10000) {
00081 if (src >= src_end)
00082 return -1;
00083 bitbuf = bytestream_get_le16(&src);
00084 mask = 1;
00085 }
00086 if (src_end - src < 2 || frame_end - frame < 2)
00087 return -1;
00088 if (bitbuf & mask) {
00089 v = bytestream_get_le16(&src);
00090 offset = (v & 0x1FFF) << 1;
00091 count = ((v >> 13) + 2) << 1;
00092 if (frame - frame_start < offset || frame_end - frame < count)
00093 return -1;
00094 av_memcpy_backptr(frame, offset, count);
00095 frame += count;
00096 } else {
00097 *frame++ = *src++;
00098 *frame++ = *src++;
00099 }
00100 mask <<= 1;
00101 }
00102
00103 return 0;
00104 }
00105
00106 static int decode_dsw1(uint8_t *frame, int width, int height,
00107 const uint8_t *src, const uint8_t *src_end)
00108 {
00109 const uint8_t *frame_start = frame;
00110 const uint8_t *frame_end = frame + width * height;
00111 int mask = 0x10000, bitbuf = 0;
00112 int v, offset, count, segments;
00113
00114 segments = bytestream_get_le16(&src);
00115 while (segments--) {
00116 if (mask == 0x10000) {
00117 if (src >= src_end)
00118 return -1;
00119 bitbuf = bytestream_get_le16(&src);
00120 mask = 1;
00121 }
00122 if (src_end - src < 2 || frame_end - frame < 2)
00123 return -1;
00124 if (bitbuf & mask) {
00125 v = bytestream_get_le16(&src);
00126 offset = (v & 0x1FFF) << 1;
00127 count = ((v >> 13) + 2) << 1;
00128 if (frame - frame_start < offset || frame_end - frame < count)
00129 return -1;
00130
00131 for (v = 0; v < count; v++)
00132 frame[v] = frame[v - offset];
00133 frame += count;
00134 } else if (bitbuf & (mask << 1)) {
00135 frame += bytestream_get_le16(&src);
00136 } else {
00137 *frame++ = *src++;
00138 *frame++ = *src++;
00139 }
00140 mask <<= 2;
00141 }
00142
00143 return 0;
00144 }
00145
00146 static int decode_dds1(uint8_t *frame, int width, int height,
00147 const uint8_t *src, const uint8_t *src_end)
00148 {
00149 const uint8_t *frame_start = frame;
00150 const uint8_t *frame_end = frame + width * height;
00151 int mask = 0x10000, bitbuf = 0;
00152 int i, v, offset, count, segments;
00153
00154 segments = bytestream_get_le16(&src);
00155 while (segments--) {
00156 if (mask == 0x10000) {
00157 if (src >= src_end)
00158 return -1;
00159 bitbuf = bytestream_get_le16(&src);
00160 mask = 1;
00161 }
00162
00163 if (bitbuf & mask) {
00164 v = bytestream_get_le16(&src);
00165 offset = (v & 0x1FFF) << 2;
00166 count = ((v >> 13) + 2) << 1;
00167 if (frame - frame_start < offset || frame_end - frame < count*2 + width)
00168 return -1;
00169 for (i = 0; i < count; i++) {
00170 frame[0] = frame[1] =
00171 frame[width] = frame[width + 1] = frame[-offset];
00172
00173 frame += 2;
00174 }
00175 } else if (bitbuf & (mask << 1)) {
00176 v = bytestream_get_le16(&src)*2;
00177 if (frame - frame_end < v)
00178 return AVERROR_INVALIDDATA;
00179 frame += v;
00180 } else {
00181 if (frame_end - frame < width + 3)
00182 return AVERROR_INVALIDDATA;
00183 frame[0] = frame[1] =
00184 frame[width] = frame[width + 1] = *src++;
00185 frame += 2;
00186 frame[0] = frame[1] =
00187 frame[width] = frame[width + 1] = *src++;
00188 frame += 2;
00189 }
00190 mask <<= 2;
00191 }
00192
00193 return 0;
00194 }
00195
00196 static int decode_bdlt(uint8_t *frame, int width, int height,
00197 const uint8_t *src, const uint8_t *src_end)
00198 {
00199 uint8_t *line_ptr;
00200 int count, lines, segments;
00201
00202 count = bytestream_get_le16(&src);
00203 if (count >= height)
00204 return -1;
00205 frame += width * count;
00206 lines = bytestream_get_le16(&src);
00207 if (count + lines > height || src >= src_end)
00208 return -1;
00209
00210 while (lines--) {
00211 line_ptr = frame;
00212 frame += width;
00213 segments = *src++;
00214 while (segments--) {
00215 if (src_end - src < 3)
00216 return -1;
00217 if (frame - line_ptr <= *src)
00218 return -1;
00219 line_ptr += *src++;
00220 count = (int8_t)*src++;
00221 if (count >= 0) {
00222 if (frame - line_ptr < count || src_end - src < count)
00223 return -1;
00224 bytestream_get_buffer(&src, line_ptr, count);
00225 } else {
00226 count = -count;
00227 if (frame - line_ptr < count || src >= src_end)
00228 return -1;
00229 memset(line_ptr, *src++, count);
00230 }
00231 line_ptr += count;
00232 }
00233 }
00234
00235 return 0;
00236 }
00237
00238 static int decode_wdlt(uint8_t *frame, int width, int height,
00239 const uint8_t *src, const uint8_t *src_end)
00240 {
00241 const uint8_t *frame_end = frame + width * height;
00242 uint8_t *line_ptr;
00243 int count, i, v, lines, segments;
00244 int y = 0;
00245
00246 lines = bytestream_get_le16(&src);
00247 if (lines > height || src >= src_end)
00248 return -1;
00249
00250 while (lines--) {
00251 segments = bytestream_get_le16(&src);
00252 while ((segments & 0xC000) == 0xC000) {
00253 unsigned skip_lines = -(int16_t)segments;
00254 unsigned delta = -((int16_t)segments * width);
00255 if (frame_end - frame <= delta || y + lines + skip_lines > height)
00256 return -1;
00257 frame += delta;
00258 y += skip_lines;
00259 segments = bytestream_get_le16(&src);
00260 }
00261 if (segments & 0x8000) {
00262 frame[width - 1] = segments & 0xFF;
00263 segments = bytestream_get_le16(&src);
00264 }
00265 line_ptr = frame;
00266 frame += width;
00267 y++;
00268 while (segments--) {
00269 if (src_end - src < 2)
00270 return -1;
00271 if (frame - line_ptr <= *src)
00272 return -1;
00273 line_ptr += *src++;
00274 count = (int8_t)*src++;
00275 if (count >= 0) {
00276 if (frame - line_ptr < count*2 || src_end - src < count*2)
00277 return -1;
00278 bytestream_get_buffer(&src, line_ptr, count*2);
00279 line_ptr += count * 2;
00280 } else {
00281 count = -count;
00282 if (frame - line_ptr < count*2 || src_end - src < 2)
00283 return -1;
00284 v = bytestream_get_le16(&src);
00285 for (i = 0; i < count; i++)
00286 bytestream_put_le16(&line_ptr, v);
00287 }
00288 }
00289 }
00290
00291 return 0;
00292 }
00293
00294 static int decode_unk6(uint8_t *frame, int width, int height,
00295 const uint8_t *src, const uint8_t *src_end)
00296 {
00297 return -1;
00298 }
00299
00300 static int decode_blck(uint8_t *frame, int width, int height,
00301 const uint8_t *src, const uint8_t *src_end)
00302 {
00303 memset(frame, 0, width * height);
00304 return 0;
00305 }
00306
00307
00308 typedef int (*chunk_decoder)(uint8_t *frame, int width, int height,
00309 const uint8_t *src, const uint8_t *src_end);
00310
00311 static const chunk_decoder decoder[8] = {
00312 decode_copy, decode_tsw1, decode_bdlt, decode_wdlt,
00313 decode_unk6, decode_dsw1, decode_blck, decode_dds1,
00314 };
00315
00316 static const char* chunk_name[8] = {
00317 "COPY", "TSW1", "BDLT", "WDLT", "????", "DSW1", "BLCK", "DDS1"
00318 };
00319
00320 static int dfa_decode_frame(AVCodecContext *avctx,
00321 void *data, int *data_size,
00322 AVPacket *avpkt)
00323 {
00324 DfaContext *s = avctx->priv_data;
00325 const uint8_t *buf = avpkt->data;
00326 const uint8_t *buf_end = avpkt->data + avpkt->size;
00327 const uint8_t *tmp_buf;
00328 uint32_t chunk_type, chunk_size;
00329 uint8_t *dst;
00330 int ret;
00331 int i, pal_elems;
00332
00333 if (s->pic.data[0])
00334 avctx->release_buffer(avctx, &s->pic);
00335
00336 if ((ret = avctx->get_buffer(avctx, &s->pic))) {
00337 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00338 return ret;
00339 }
00340
00341 while (buf < buf_end) {
00342 chunk_size = AV_RL32(buf + 4);
00343 chunk_type = AV_RL32(buf + 8);
00344 buf += 12;
00345 if (buf_end - buf < chunk_size) {
00346 av_log(avctx, AV_LOG_ERROR, "Chunk size is too big (%d bytes)\n", chunk_size);
00347 return -1;
00348 }
00349 if (!chunk_type)
00350 break;
00351 if (chunk_type == 1) {
00352 pal_elems = FFMIN(chunk_size / 3, 256);
00353 tmp_buf = buf;
00354 for (i = 0; i < pal_elems; i++) {
00355 s->pal[i] = bytestream_get_be24(&tmp_buf) << 2;
00356 s->pal[i] |= (s->pal[i] >> 6) & 0x333;
00357 }
00358 s->pic.palette_has_changed = 1;
00359 } else if (chunk_type <= 9) {
00360 if (decoder[chunk_type - 2](s->frame_buf, avctx->width, avctx->height,
00361 buf, buf + chunk_size)) {
00362 av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n",
00363 chunk_name[chunk_type - 2]);
00364 return -1;
00365 }
00366 } else {
00367 av_log(avctx, AV_LOG_WARNING, "Ignoring unknown chunk type %d\n",
00368 chunk_type);
00369 }
00370 buf += chunk_size;
00371 }
00372
00373 buf = s->frame_buf;
00374 dst = s->pic.data[0];
00375 for (i = 0; i < avctx->height; i++) {
00376 memcpy(dst, buf, avctx->width);
00377 dst += s->pic.linesize[0];
00378 buf += avctx->width;
00379 }
00380 memcpy(s->pic.data[1], s->pal, sizeof(s->pal));
00381
00382 *data_size = sizeof(AVFrame);
00383 *(AVFrame*)data = s->pic;
00384
00385 return avpkt->size;
00386 }
00387
00388 static av_cold int dfa_decode_end(AVCodecContext *avctx)
00389 {
00390 DfaContext *s = avctx->priv_data;
00391
00392 if (s->pic.data[0])
00393 avctx->release_buffer(avctx, &s->pic);
00394
00395 av_freep(&s->frame_buf);
00396
00397 return 0;
00398 }
00399
00400 AVCodec ff_dfa_decoder = {
00401 "dfa",
00402 AVMEDIA_TYPE_VIDEO,
00403 CODEC_ID_DFA,
00404 sizeof(DfaContext),
00405 dfa_decode_init,
00406 NULL,
00407 dfa_decode_end,
00408 dfa_decode_frame,
00409 CODEC_CAP_DR1,
00410 .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
00411 };