avformat/argo_asf: split functionality into a header

For future use by the argo_brp demuxer.

Adds:
  - void ff_argo_asf_parse_file_header(ArgoASFFileHeader *hdr, const uint8_t *buf);
  - int  ff_argo_asf_validate_file_header(AVFormatContext *s, const ArgoASFFileHeader *hdr);
  - void ff_argo_asf_parse_chunk_header(ArgoASFChunkHeader *hdr, const uint8_t *buf);
  - int  ff_argo_asf_fill_stream(AVStream *st, const ArgoASFChunkHeader *ckhdr);

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/libavformat/argo_asf.h b/libavformat/argo_asf.h
new file mode 100644
index 0000000000..905769dafe
--- /dev/null
+++ b/libavformat/argo_asf.h
@@ -0,0 +1,67 @@
+/*
+ * Argonaut Games ASF (de)muxer
+ *
+ * Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
+ *
+ * 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
+ */
+
+#ifndef AVFORMAT_ARGO_ASF_H
+#define AVFORMAT_ARGO_ASF_H
+
+#include <stdint.h>
+
+#define ASF_TAG                 MKTAG('A', 'S', 'F', '\0')
+#define ASF_FILE_HEADER_SIZE    24
+#define ASF_CHUNK_HEADER_SIZE   20
+#define ASF_SAMPLE_COUNT        32
+
+typedef struct ArgoASFFileHeader {
+    uint32_t    magic;          /*< Magic Number, {'A', 'S', 'F', '\0'} */
+    uint16_t    version_major;  /*< File Major Version. */
+    uint16_t    version_minor;  /*< File Minor Version. */
+    uint32_t    num_chunks;     /*< No. chunks in the file. */
+    uint32_t    chunk_offset;   /*< Offset to the first chunk from the start of the file. */
+    int8_t      name[8];        /*< Name. */
+} ArgoASFFileHeader;
+
+typedef struct ArgoASFChunkHeader {
+    uint32_t    num_blocks;     /*< No. blocks in the chunk. */
+    uint32_t    num_samples;    /*< No. samples per channel in a block. Always 32. */
+    uint32_t    unk1;           /*< Unknown */
+    uint16_t    sample_rate;    /*< Sample rate. */
+    uint16_t    unk2;           /*< Unknown. */
+    uint32_t    flags;          /*< Stream flags. */
+} ArgoASFChunkHeader;
+
+enum {
+    ASF_CF_BITS_PER_SAMPLE  = (1 << 0), /*< 16-bit if set, 8 otherwise.      */
+    ASF_CF_STEREO           = (1 << 1), /*< Stereo if set, mono otherwise.   */
+    ASF_CF_ALWAYS1_1        = (1 << 2), /*< Unknown, always seems to be set. */
+    ASF_CF_ALWAYS1_2        = (1 << 3), /*< Unknown, always seems to be set. */
+
+    ASF_CF_ALWAYS1          = ASF_CF_ALWAYS1_1 | ASF_CF_ALWAYS1_2,
+    ASF_CF_ALWAYS0          = ~(ASF_CF_BITS_PER_SAMPLE | ASF_CF_STEREO | ASF_CF_ALWAYS1)
+};
+
+void ff_argo_asf_parse_file_header(ArgoASFFileHeader *hdr, const uint8_t *buf);
+int  ff_argo_asf_validate_file_header(AVFormatContext *s, const ArgoASFFileHeader *hdr);
+void ff_argo_asf_parse_chunk_header(ArgoASFChunkHeader *hdr, const uint8_t *buf);
+int  ff_argo_asf_fill_stream(AVStream *st, const ArgoASFFileHeader *fhdr,
+                             const ArgoASFChunkHeader *ckhdr);
+
+#endif /* AVFORMAT_ARGO_ASF_H */