diff options
Diffstat (limited to 'libavcodec/hdr_parser.c')
-rw-r--r-- | libavcodec/hdr_parser.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/libavcodec/hdr_parser.c b/libavcodec/hdr_parser.c new file mode 100644 index 0000000000..915fd38225 --- /dev/null +++ b/libavcodec/hdr_parser.c @@ -0,0 +1,79 @@ +/* + * Radiance HDR parser + * Copyright (c) 2022 Paul B Mahol + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Radiance HDR parser + */ + +#include "libavutil/intreadwrite.h" +#include "parser.h" + +typedef struct HDRParseContext { + ParseContext pc; +} HDRParseContext; + +static int hdr_parse(AVCodecParserContext *s, AVCodecContext *avctx, + const uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + HDRParseContext *ipc = s->priv_data; + uint64_t state = ipc->pc.state64; + int next = END_NOT_FOUND, i = 0; + + *poutbuf_size = 0; + *poutbuf = NULL; + + if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { + next = buf_size; + } else { + for (; i < buf_size; i++) { + state = (state << 8) | buf[i]; + if (state == AV_RB64("ADIANCE\n") && (i > 10 || ipc->pc.index > 10)) { + next = i - 10; + break; + } + } + + ipc->pc.state64 = state; + if (ff_combine_frame(&ipc->pc, next, &buf, &buf_size) < 0) { + *poutbuf = NULL; + *poutbuf_size = 0; + return buf_size; + } + } + + *poutbuf = buf; + *poutbuf_size = buf_size; + + s->pict_type = AV_PICTURE_TYPE_I; + s->key_frame = 1; + s->duration = 1; + + return next; +} + +const AVCodecParser ff_hdr_parser = { + .codec_ids = { AV_CODEC_ID_RADIANCE_HDR }, + .priv_data_size = sizeof(HDRParseContext), + .parser_parse = hdr_parse, + .parser_close = ff_parse_close, +}; |