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103 lines
3.3 KiB
103 lines
3.3 KiB
/* |
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* SAUCE header parser |
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* Copyright (c) 2010 Peter Ross <pross@xvid.org> |
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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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/** |
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* @file |
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* SAUCE header parser |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "sauce.h" |
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int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height) |
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{ |
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AVIOContext *pb = avctx->pb; |
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char buf[36]; |
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int datatype, filetype, t1, t2, nb_comments, flags; |
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uint64_t start_pos = url_fsize(pb) - 128; |
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avio_seek(pb, start_pos, SEEK_SET); |
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if (avio_read(pb, buf, 7) != 7) |
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return -1; |
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if (memcmp(buf, "SAUCE00", 7)) |
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return -1; |
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#define GET_SAUCE_META(name,size) \ |
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if (avio_read(pb, buf, size) == size && buf[0]) { \ |
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buf[size] = 0; \ |
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av_metadata_set2(&avctx->metadata, name, buf, 0); \ |
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} |
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GET_SAUCE_META("title", 35) |
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GET_SAUCE_META("artist", 20) |
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GET_SAUCE_META("publisher", 20) |
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GET_SAUCE_META("date", 8) |
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avio_seek(pb, 4, SEEK_CUR); |
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datatype = avio_r8(pb); |
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filetype = avio_r8(pb); |
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t1 = avio_rl16(pb); |
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t2 = avio_rl16(pb); |
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nb_comments = avio_r8(pb); |
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flags = avio_r8(pb); |
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avio_seek(pb, 4, SEEK_CUR); |
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GET_SAUCE_META("encoder", 22); |
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if (got_width && datatype && filetype) { |
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if ((datatype == 1 && filetype <=2) || (datatype == 5 && filetype == 255) || datatype == 6) { |
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if (t1) { |
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avctx->streams[0]->codec->width = t1<<3; |
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*got_width = 1; |
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} |
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if (get_height && t2) |
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avctx->streams[0]->codec->height = t2<<4; |
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} else if (datatype == 5) { |
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if (filetype > 1) { |
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avctx->streams[0]->codec->width = (filetype == 1 ? t1 : filetype) << 4; |
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*got_width = 1; |
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} |
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if (get_height && t2) |
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avctx->streams[0]->codec->height = t2<<4; |
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} |
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} |
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*fsize -= 128; |
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if (nb_comments > 0) { |
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avio_seek(pb, start_pos - 64*nb_comments - 5, SEEK_SET); |
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if (avio_read(pb, buf, 5) == 5 && !memcmp(buf, "COMNT", 5)) { |
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int i; |
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char *str = av_malloc(65*nb_comments + 1); |
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*fsize -= 64*nb_comments + 5; |
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if (!str) |
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return 0; |
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for (i = 0; i < nb_comments; i++) { |
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if (avio_read(pb, str + 65*i, 64) != 64) |
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break; |
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str[65*i + 64] = '\n'; |
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} |
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str[65*i] = 0; |
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av_metadata_set2(&avctx->metadata, "comment", str, AV_METADATA_DONT_STRDUP_VAL); |
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} |
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} |
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return 0; |
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}
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