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/* |
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* Canopus common routines |
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* Copyright (c) 2015 Vittorio Giovara <vittorio.giovara@gmail.com> |
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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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#include <stdint.h> |
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#include "libavutil/rational.h" |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "canopus.h" |
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int ff_canopus_parse_info_tag(AVCodecContext *avctx, |
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const uint8_t *src, size_t size) |
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{ |
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GetByteContext gbc; |
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int par_x, par_y, field_order; |
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bytestream2_init(&gbc, src, size); |
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/* Parse aspect ratio. */ |
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bytestream2_skip(&gbc, 8); // unknown, 16 bits 1 |
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par_x = bytestream2_get_le32(&gbc); |
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par_y = bytestream2_get_le32(&gbc); |
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✓✗✓✗
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if (par_x && par_y) |
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av_reduce(&avctx->sample_aspect_ratio.num, |
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&avctx->sample_aspect_ratio.den, |
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par_x, par_y, 255); |
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/* Short INFO tag (used in CLLC) has only AR data. */ |
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✓✓ |
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if (size == 0x18) |
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return 0; |
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bytestream2_skip(&gbc, 16); // unknown RDRT tag |
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/* Parse FIEL tag. */ |
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bytestream2_skip(&gbc, 8); // 'FIEL' and 4 bytes 0 |
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field_order = bytestream2_get_le32(&gbc); |
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✓✗✓✗
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switch (field_order) { |
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case 0: avctx->field_order = AV_FIELD_TT; break; |
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case 1: avctx->field_order = AV_FIELD_BB; break; |
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case 2: avctx->field_order = AV_FIELD_PROGRESSIVE; break; |
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} |
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return 0; |
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} |