4 * Copyright (C) 2014 Adam Williams <broadcast at earthling dot net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program 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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include "bcsignals.h"
27 #include "mainerror.h"
37 int GifQuantizeBuffer(unsigned int Width, unsigned int Height,
38 int *ColorMapSize, GifByteType * RedInput,
39 GifByteType * GreenInput, GifByteType * BlueInput,
40 GifByteType * OutputBuffer,
41 GifColorType * OutputColorMap);
43 FileGIF::FileGIF(Asset *asset, File *file)
44 : FileBase(asset, file)
66 int FileGIF::check_sig(Asset *asset)
68 FILE *stream = fopen(asset->path, "rb");
71 int ret = fread(test, 1, 6, stream);
74 test[0] == 'G' && test[1] == 'I' && test[2] == 'F' &&
75 test[3] == '8' && (test[4] == '7' || test[4] == '9') &&
76 test[5] == 'a' ) return 1;
81 int FileGIF::colormodel_supported(int colormodel)
86 int FileGIF::get_best_colormodel(Asset *asset, int driver)
92 int FileGIF::read_frame_header(char *path)
94 FILE *stream = fopen(path, "rb");
96 unsigned char test[16];
97 int ret = fread(test, 16, 1, stream);
99 if( ret < 1 ) return 1;
100 asset->format = FILE_GIF;
101 asset->width = test[6] | (test[7] << 8);
102 asset->height = test[8] | (test[9] << 8);
110 static int input_file(GifFileType *gif_file, GifByteType *buffer, int bytes)
112 FileGIF *file = (FileGIF*)gif_file->UserData;
113 fseek(file->fp, file->offset, SEEK_SET);
114 bytes = fread(buffer, 1, bytes, file->fp);
115 file->offset += bytes;
119 int FileGIF::open_file(int rd, int wr)
121 return rd ? ropen_path(asset->path) :
122 wr ? wopen_path(asset->path) :
126 int FileGIF::ropen_path(const char *path)
128 fp = fopen(path, "r");
129 int result = !fp ? 1 : 0;
132 gif_file = DGifOpen(this, input_file, &err);
134 eprintf("FileGIF::ropen_path %d: %s\n", __LINE__, GifErrorString(err));
143 int FileGIF::wopen_path(const char *path)
145 fd = open(path, O_CREAT+O_TRUNC+O_WRONLY, 0777);
146 int result = fd < 0 ? 1 : 0;
148 gif_file = EGifOpenFileHandle(fd, &err);
150 eprintf("FileGIF::wopen_path %d: %s\n", __LINE__, GifErrorString(err));
160 int FileGIF::write_frames(VFrame ***frames, int len)
162 int result = !gif_file ? 1 : 0;
163 for( int i=0; i<len && !result; ++i )
164 result = write_frame(frames[0][i]);
168 int FileGIF::open_gif()
170 file_pos.remove_all();
171 int width = asset->width;
172 int height = asset->height;
173 int result = read_frame_header(asset->path);
175 asset->actual_width = asset->width;
176 if( width ) asset->width = width;
177 asset->actual_height = asset->height;
178 if( height ) asset->height = height;
180 if( !asset->frame_rate )
181 asset->frame_rate = 10;
182 asset->video_data = 1;
183 row_size = gif_file->SWidth * sizeof(GifPixelType);
184 bg = (GifRowType)malloc(row_size);
185 for( int i=0; i<gif_file->SWidth; ++i )
186 bg[i] = gif_file->SBackGroundColor;
187 rows = gif_file->SHeight;
188 buffer = (GifRowType*)malloc(sizeof(GifRowType) * rows);
189 for( int i=0; i<gif_file->SHeight; ++i ) {
190 buffer[i] = (GifRowType)malloc(row_size);
191 memcpy(buffer[i], bg, row_size);
194 asset->video_length = file_pos.size();
199 int FileGIF::close_file()
202 EGifCloseFile(gif_file, &err);
211 if( bg ) { free(bg); bg = 0; }
213 for( int k=0; k<rows; ++k )
215 free(buffer); buffer = 0;
224 FileBase::close_file();
228 int FileGIF::scan_gif()
231 int64_t file_offset = offset;
232 file_pos.remove_all();
233 int image_pos = offset, ret;
234 // read all imgs, build file_pos index
235 while( (ret=read_next_image(0)) > 0 ) {
236 file_pos.append(image_pos);
240 offset = file_offset;
244 int FileGIF::set_video_position(int64_t pos)
246 if( !gif_file || !asset->video_length ) return 1;
247 int64_t sz = file_pos.size();
248 eof = pos < 0 || pos >= sz ? 1 : 0;
249 offset = !eof ? file_pos[pos] : 0;
253 int FileGIF::read_frame(VFrame *output)
255 if( !gif_file ) return 1;
256 for( int i=0; i<gif_file->SHeight; ++i )
257 memcpy(buffer[i], bg, row_size);
258 int ret = read_next_image(output) > 0 ? 0 : 1;
262 // ret = -1:err, 0:eof, 1:frame
263 int FileGIF::read_next_image(VFrame *output)
266 GifRecordType record_type;
268 while( !ret && !eof ) {
269 if( DGifGetRecordType(gif_file, &record_type) == GIF_ERROR ) {
270 err = gif_file->Error;
271 eprintf("FileGIF::read_frame %d: %s\n", __LINE__, GifErrorString(err));
276 switch( record_type ) {
277 case IMAGE_DESC_RECORD_TYPE: {
278 if( DGifGetImageDesc(gif_file) == GIF_ERROR ) {
279 err = gif_file->Error;
280 eprintf("FileGIF::read_frame %d: %s\n", __LINE__, GifErrorString(err));
283 int row = gif_file->Image.Top;
284 int col = gif_file->Image.Left;
285 int width = gif_file->Image.Width;
286 int height = gif_file->Image.Height;
287 if( gif_file->Image.Left + gif_file->Image.Width > gif_file->SWidth ||
288 gif_file->Image.Top + gif_file->Image.Height > gif_file->SHeight )
290 if( !ret && gif_file->Image.Interlace ) {
291 static int InterlacedOffset[] = { 0, 4, 2, 1 };
292 static int InterlacedJumps[] = { 8, 8, 4, 2 };
293 /* Need to perform 4 passes on the images: */
294 for( int i=0; i<4; ++i ) {
295 int j = row + InterlacedOffset[i];
296 for( ; !ret && j<row + height; j+=InterlacedJumps[i] ) {
297 if( DGifGetLine(gif_file, &buffer[j][col], width) == GIF_ERROR )
303 for( int i=0; !ret && i<height; ++i ) {
304 if (DGifGetLine(gif_file, &buffer[row++][col], width) == GIF_ERROR)
310 case EXTENSION_RECORD_TYPE: {
312 GifByteType *ExtData = 0;
313 if( DGifGetExtension(gif_file, &ExtFunction, &ExtData) == GIF_ERROR )
315 while( !ret && ExtData ) {
316 if( DGifGetExtensionNext(gif_file, &ExtData) == GIF_ERROR )
320 case TERMINATE_RECORD_TYPE:
329 ColorMapObject *color_map = 0;
331 color_map = gif_file->Image.ColorMap;
332 if( !color_map ) color_map = gif_file->SColorMap;
333 if( !color_map ) ret = -1;
335 if( ret > 0 && output ) {
336 int screen_width = gif_file->SWidth;
337 int screen_height = gif_file->SHeight;
338 for( int i=0; i<screen_height; ++i ) {
339 GifRowType row = buffer[i];
340 unsigned char *out_ptr = output->get_rows()[i];
341 for( int j=0; j<screen_width; ++j ) {
342 GifColorType *color_map_entry = &color_map->Colors[row[j]];
343 *out_ptr++ = color_map_entry->Red;
344 *out_ptr++ = color_map_entry->Green;
345 *out_ptr++ = color_map_entry->Blue;
352 int FileGIF::write_frame(VFrame *frame)
354 int w = frame->get_w(), h = frame->get_h();
355 ColorMapObject *cmap = 0;
356 int cmap_sz = depth >= 0 ? 1 << depth : 0;
357 int64_t len = w * h * sizeof(GifByteType);
358 GifByteType *bfr = (GifByteType *) malloc(len);
359 int result = !bfr ? 1 : 0;
361 VFrame gbrp(w, h, BC_GBRP);
362 gbrp.transfer_from(frame);
363 if( !(cmap = GifMakeMapObject(cmap_sz, 0)) )
366 GifByteType *gp = (GifByteType *)gbrp.get_r();
367 GifByteType *bp = (GifByteType *)gbrp.get_g();
368 GifByteType *rp = (GifByteType *)gbrp.get_b();
369 if( GifQuantizeBuffer(w, h, &cmap_sz, rp, gp, bp,
370 bfr, cmap->Colors) == GIF_ERROR )
374 if( !result && !writes &&
375 EGifPutScreenDesc(gif_file, w, h, depth, 0, 0) == GIF_ERROR )
378 EGifPutImageDesc(gif_file, 0, 0, w, h, 0, cmap) == GIF_ERROR )
381 GifByteType *bp = bfr;
382 for( int y=0; !result && y<h; ++y ) {
383 if( EGifPutLine(gif_file, bp, w) == GIF_ERROR )
387 GifFreeMapObject(cmap);
393 static int write_data(GifFileType *gif_file, const GifByteType *bfr, int bytes)
395 FileGIF *file = (FileGIF*)gif_file->UserData;
396 VFrame *output = file->output;
397 long size = output->get_compressed_size();
398 long alloc = output->get_compressed_allocated();
399 long len = size + bytes;
401 output->allocate_compressed_data(2*size + bytes);
402 unsigned char *data = output->get_data() + size;
403 memcpy(data, bfr, bytes);
404 output->set_compressed_size(len);
408 int FileGIF::wopen_data(VFrame *output)
411 gif_file = EGifOpen(this, write_data, &err);
413 eprintf("FileGIF::wopen_data %d: %s\n", __LINE__, GifErrorString(err));
417 output->set_compressed_size(0);
418 this->output = output;
425 FileGIFList::FileGIFList(Asset *asset, File *file)
426 : FileList(asset, file, "GIFLIST", ".gif", FILE_UNKNOWN, FILE_GIF_LIST)
430 FileGIFList::~FileGIFList()
434 int FileGIFList::check_sig(Asset *asset)
436 FILE *stream = fopen(asset->path, "rb");
438 unsigned char test[16];
439 int ret = fread(test, 16, 1, stream);
441 if( ret < 1 ) return 1;
442 if( test[0] == 'G' && test[1] == 'I' && test[2] == 'F' &&
443 test[3] == 'L' && test[4] == 'I' && test[5] == 'S' && test[6] == 'T')
449 int FileGIFList::colormodel_supported(int colormodel) { return BC_RGB888; }
450 int FileGIFList::get_best_colormodel(Asset *asset, int driver) { return BC_RGB888; }
452 int FileGIFList::read_frame_header(char *path)
454 FILE *stream = fopen(path, "rb");
456 unsigned char test[16];
457 int ret = fread(test, 16, 1, stream);
459 if( ret < 1 ) return 1;
460 asset->format = FILE_GIF_LIST;
461 asset->width = test[6] | (test[7] << 8);
462 asset->height = test[8] | (test[9] << 8);
469 int FileGIFList::read_frame(VFrame *output, char *path)
471 Asset *asset = new Asset(path);
472 FileGIF gif(asset, file);
473 int ret = gif.ropen_path(path);
475 ret = gif.read_frame(output);
476 asset->remove_user();
480 int FileGIFList::write_frame(VFrame *frame, VFrame *data, FrameWriterUnit *unit)
482 int native_cmodel = BC_RGB888;
483 if( frame->get_color_model() != native_cmodel ) {
484 GIFUnit *gif_unit = (GIFUnit *)unit;
485 if( !gif_unit->temp_frame ) gif_unit->temp_frame =
486 new VFrame(frame->get_w(), frame->get_h(), native_cmodel);
487 gif_unit->temp_frame->transfer_from(frame);
488 frame = gif_unit->temp_frame;
491 FileGIF gif(asset, file);
492 int ret = gif.wopen_data(data);
494 ret = gif.write_frame(frame);
498 FrameWriterUnit* FileGIFList::new_writer_unit(FrameWriter *writer)
500 return new GIFUnit(this, writer);
503 GIFUnit::GIFUnit(FileGIFList *file, FrameWriter *writer)
504 : FrameWriterUnit(writer)