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00038 #include <stdio.h>
00039 #include <stdlib.h>
00040
00041 #include "avcodec.h"
00042
00043 #ifdef CONFIG_ZLIB
00044 #include <zlib.h>
00045 #endif
00046
00047
00048
00049
00050
00051 typedef struct TsccContext {
00052
00053 AVCodecContext *avctx;
00054 AVFrame pic;
00055
00056
00057 int bpp;
00058
00059 unsigned int decomp_size;
00060
00061 unsigned char* decomp_buf;
00062 int height;
00063 #ifdef CONFIG_ZLIB
00064 z_stream zstream;
00065 #endif
00066 } CamtasiaContext;
00067
00068
00069
00070
00071
00072
00073
00074
00075 static int decode_rle(CamtasiaContext *c, unsigned int srcsize)
00076 {
00077 unsigned char *src = c->decomp_buf;
00078 unsigned char *output, *output_end;
00079 int p1, p2, line=c->height, pos=0, i;
00080 uint16_t pix16;
00081 uint32_t pix32;
00082
00083 output = c->pic.data[0] + (c->height - 1) * c->pic.linesize[0];
00084 output_end = c->pic.data[0] + (c->height) * c->pic.linesize[0];
00085 while(src < c->decomp_buf + srcsize) {
00086 p1 = *src++;
00087 if(p1 == 0) {
00088 p2 = *src++;
00089 if(p2 == 0) {
00090 output = c->pic.data[0] + (--line) * c->pic.linesize[0];
00091 if (line < 0)
00092 return -1;
00093 pos = 0;
00094 continue;
00095 } else if(p2 == 1) {
00096 return 0;
00097 } else if(p2 == 2) {
00098 p1 = *src++;
00099 p2 = *src++;
00100 line -= p2;
00101 if (line < 0)
00102 return -1;
00103 pos += p1;
00104 output = c->pic.data[0] + line * c->pic.linesize[0] + pos * (c->bpp / 8);
00105 continue;
00106 }
00107
00108 if (output + p2 * (c->bpp / 8) > output_end) {
00109 src += p2 * (c->bpp / 8);
00110 continue;
00111 }
00112 if ((c->bpp == 8) || (c->bpp == 24)) {
00113 for(i = 0; i < p2 * (c->bpp / 8); i++) {
00114 *output++ = *src++;
00115 }
00116
00117 if(c->bpp == 8 && (p2 & 1)) {
00118 src++;
00119 }
00120 } else if (c->bpp == 16) {
00121 for(i = 0; i < p2; i++) {
00122 pix16 = AV_RL16(src);
00123 src += 2;
00124 *(uint16_t*)output = pix16;
00125 output += 2;
00126 }
00127 } else if (c->bpp == 32) {
00128 for(i = 0; i < p2; i++) {
00129 pix32 = AV_RL32(src);
00130 src += 4;
00131 *(uint32_t*)output = pix32;
00132 output += 4;
00133 }
00134 }
00135 pos += p2;
00136 } else {
00137 int pix[4];
00138 switch(c->bpp){
00139 case 8: pix[0] = *src++;
00140 break;
00141 case 16: pix16 = AV_RL16(src);
00142 src += 2;
00143 *(uint16_t*)pix = pix16;
00144 break;
00145 case 24: pix[0] = *src++;
00146 pix[1] = *src++;
00147 pix[2] = *src++;
00148 break;
00149 case 32: pix32 = AV_RL32(src);
00150 src += 4;
00151 *(uint32_t*)pix = pix32;
00152 break;
00153 }
00154 if (output + p1 * (c->bpp / 8) > output_end)
00155 continue;
00156 for(i = 0; i < p1; i++) {
00157 switch(c->bpp){
00158 case 8: *output++ = pix[0];
00159 break;
00160 case 16: *(uint16_t*)output = pix16;
00161 output += 2;
00162 break;
00163 case 24: *output++ = pix[0];
00164 *output++ = pix[1];
00165 *output++ = pix[2];
00166 break;
00167 case 32: *(uint32_t*)output = pix32;
00168 output += 4;
00169 break;
00170 }
00171 }
00172 pos += p1;
00173 }
00174 }
00175
00176 av_log(c->avctx, AV_LOG_ERROR, "Camtasia warning: no End-of-picture code\n");
00177 return 1;
00178 }
00179
00180
00181
00182
00183
00184
00185 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
00186 {
00187 CamtasiaContext * const c = avctx->priv_data;
00188 const unsigned char *encoded = buf;
00189 unsigned char *outptr;
00190 #ifdef CONFIG_ZLIB
00191 int zret;
00192 #endif
00193 int len = buf_size;
00194
00195 if(c->pic.data[0])
00196 avctx->release_buffer(avctx, &c->pic);
00197
00198 c->pic.reference = 1;
00199 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
00200 if(avctx->get_buffer(avctx, &c->pic) < 0){
00201 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00202 return -1;
00203 }
00204
00205 outptr = c->pic.data[0];
00206
00207 #ifdef CONFIG_ZLIB
00208 zret = inflateReset(&(c->zstream));
00209 if (zret != Z_OK) {
00210 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
00211 return -1;
00212 }
00213 c->zstream.next_in = encoded;
00214 c->zstream.avail_in = len;
00215 c->zstream.next_out = c->decomp_buf;
00216 c->zstream.avail_out = c->decomp_size;
00217 zret = inflate(&(c->zstream), Z_FINISH);
00218
00219 if ((zret != Z_OK) && (zret != Z_STREAM_END) && (zret != Z_DATA_ERROR)) {
00220 av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
00221 return -1;
00222 }
00223
00224
00225 if(zret != Z_DATA_ERROR)
00226 decode_rle(c, c->zstream.avail_out);
00227
00228
00229 if (c->avctx->pix_fmt == PIX_FMT_PAL8) {
00230 memcpy(c->pic.data[1], c->avctx->palctrl->palette, AVPALETTE_SIZE);
00231 if (c->avctx->palctrl->palette_changed) {
00232 c->pic.palette_has_changed = 1;
00233 c->avctx->palctrl->palette_changed = 0;
00234 }
00235 }
00236
00237 #else
00238 av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
00239 return -1;
00240 #endif
00241
00242 *data_size = sizeof(AVFrame);
00243 *(AVFrame*)data = c->pic;
00244
00245
00246 return buf_size;
00247 }
00248
00249
00250
00251
00252
00253
00254
00255
00256 static int decode_init(AVCodecContext *avctx)
00257 {
00258 CamtasiaContext * const c = avctx->priv_data;
00259 int zret;
00260
00261 c->avctx = avctx;
00262
00263 c->pic.data[0] = NULL;
00264 c->height = avctx->height;
00265
00266 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
00267 return 1;
00268 }
00269
00270 #ifdef CONFIG_ZLIB
00271
00272 memset(&(c->zstream), 0, sizeof(z_stream));
00273 #else
00274 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
00275 return 1;
00276 #endif
00277 switch(avctx->bits_per_sample){
00278 case 8: avctx->pix_fmt = PIX_FMT_PAL8; break;
00279 case 16: avctx->pix_fmt = PIX_FMT_RGB555; break;
00280 case 24:
00281 avctx->pix_fmt = PIX_FMT_BGR24;
00282 break;
00283 case 32: avctx->pix_fmt = PIX_FMT_RGB32; break;
00284 default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_sample);
00285 return -1;
00286 }
00287 c->bpp = avctx->bits_per_sample;
00288 c->decomp_size = (avctx->width * c->bpp + (avctx->width + 254) / 255 + 2) * avctx->height + 2;
00289
00290
00291 if (c->decomp_size) {
00292 if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
00293 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
00294 return 1;
00295 }
00296 }
00297
00298 #ifdef CONFIG_ZLIB
00299 c->zstream.zalloc = Z_NULL;
00300 c->zstream.zfree = Z_NULL;
00301 c->zstream.opaque = Z_NULL;
00302 zret = inflateInit(&(c->zstream));
00303 if (zret != Z_OK) {
00304 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
00305 return 1;
00306 }
00307 #endif
00308
00309 return 0;
00310 }
00311
00312
00313
00314
00315
00316
00317
00318
00319 static int decode_end(AVCodecContext *avctx)
00320 {
00321 CamtasiaContext * const c = avctx->priv_data;
00322
00323 av_freep(&c->decomp_buf);
00324
00325 if (c->pic.data[0])
00326 avctx->release_buffer(avctx, &c->pic);
00327 #ifdef CONFIG_ZLIB
00328 inflateEnd(&(c->zstream));
00329 #endif
00330
00331 return 0;
00332 }
00333
00334 AVCodec tscc_decoder = {
00335 "camtasia",
00336 CODEC_TYPE_VIDEO,
00337 CODEC_ID_TSCC,
00338 sizeof(CamtasiaContext),
00339 decode_init,
00340 NULL,
00341 decode_end,
00342 decode_frame,
00343 CODEC_CAP_DR1,
00344 };
00345