1 /* 2 * Argonaut Games ASF (de)muxer 3 * 4 * Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com) 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23 #ifndef AVFORMAT_ARGO_ASF_H 24 #define AVFORMAT_ARGO_ASF_H 25 26 #include <stdint.h> 27 #include "libavutil/common.h" 28 29 #include "avformat.h" 30 31 #define ASF_TAG MKTAG('A', 'S', 'F', '\0') 32 #define ASF_FILE_HEADER_SIZE 24 33 #define ASF_CHUNK_HEADER_SIZE 20 34 #define ASF_SAMPLE_COUNT 32 35 #define ASF_MIN_BUFFER_SIZE FFMAX(ASF_FILE_HEADER_SIZE, ASF_CHUNK_HEADER_SIZE) 36 37 typedef struct ArgoASFFileHeader { 38 uint32_t magic; /*< Magic Number, {'A', 'S', 'F', '\0'} */ 39 uint16_t version_major; /*< File Major Version. */ 40 uint16_t version_minor; /*< File Minor Version. */ 41 uint32_t num_chunks; /*< No. chunks in the file. */ 42 uint32_t chunk_offset; /*< Offset to the first chunk from the start of the file. */ 43 int8_t name[8]; /*< Name. */ 44 } ArgoASFFileHeader; 45 46 typedef struct ArgoASFChunkHeader { 47 uint32_t num_blocks; /*< No. blocks in the chunk. */ 48 uint32_t num_samples; /*< No. samples per channel in a block. Always 32. */ 49 uint32_t unk1; /*< Unknown */ 50 uint16_t sample_rate; /*< Sample rate. */ 51 uint16_t unk2; /*< Unknown. */ 52 uint32_t flags; /*< Stream flags. */ 53 } ArgoASFChunkHeader; 54 55 enum { 56 ASF_CF_BITS_PER_SAMPLE = (1 << 0), /*< 16-bit if set, 8 otherwise. */ 57 ASF_CF_STEREO = (1 << 1), /*< Stereo if set, mono otherwise. */ 58 ASF_CF_ALWAYS1_1 = (1 << 2), /*< Unknown, always seems to be set. */ 59 ASF_CF_ALWAYS1_2 = (1 << 3), /*< Unknown, always seems to be set. */ 60 61 ASF_CF_ALWAYS1 = ASF_CF_ALWAYS1_1 | ASF_CF_ALWAYS1_2, 62 ASF_CF_ALWAYS0 = ~(ASF_CF_BITS_PER_SAMPLE | ASF_CF_STEREO | ASF_CF_ALWAYS1) 63 }; 64 65 void ff_argo_asf_parse_file_header(ArgoASFFileHeader *hdr, const uint8_t *buf); 66 int ff_argo_asf_validate_file_header(AVFormatContext *s, const ArgoASFFileHeader *hdr); 67 void ff_argo_asf_parse_chunk_header(ArgoASFChunkHeader *hdr, const uint8_t *buf); 68 int ff_argo_asf_fill_stream(AVFormatContext *s, AVStream *st, const ArgoASFFileHeader *fhdr, 69 const ArgoASFChunkHeader *ckhdr); 70 71 #endif /* AVFORMAT_ARGO_ASF_H */ 72