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d14e40d378
Add license headers to `h`, `c` and `sql` files as this files haven't been checked previously, script now to automatically updates current year in existing licenses.
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
// Copyright (c) 2017-2020, Mudita Sp. z.o.o. All rights reserved.
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// For licensing, see https://github.com/mudita/MuditaOS/LICENSE.md
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#include "xing_header.h"
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#include <string.h>
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/* XING VBR-Header
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size description
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4 'Xing' or 'Info'
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4 flags (indicates which fields are used)
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4 frames (optional)
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4 bytes (optional)
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100 toc (optional)
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4 a VBR quality indicator: 0=best 100=worst (optional)
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*/
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typedef struct
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{
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char desc[4];
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uint32_t flags;
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} xing_header_t;
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// for XING VBR Header flags
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#define FRAMES_FLAG 0x0001
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#define BYTES_FLAG 0x0002
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#define TOC_FLAG 0x0004
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#define VBR_SCALE_FLAG 0x0008
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//! Byte swap unsigned int
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static inline uint32_t swap32(uint32_t ui)
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{
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return (ui >> 24) | ((ui << 8) & 0x00FF0000) | ((ui >> 8) & 0x0000FF00) | (ui << 24);
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}
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uint8_t parseXingHeader(uint8_t *data, size_t datasize, xing_info_t *info)
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{
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char *p1 = memmem(data, datasize, "Xing", 4);
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char *p2 = memmem(data, datasize, "Info", 4);
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if (p1 != NULL || p2 != NULL) {
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xing_header_t *head = (xing_header_t *)(p1 != NULL ? p1 : p2);
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uint8_t *raw_data = (uint8_t *)head + sizeof(xing_header_t);
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head->flags = swap32(head->flags);
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uint8_t offset = 0;
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// get flags (mandatory in XING header)
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// extract total number of frames in file
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if (head->flags & FRAMES_FLAG) {
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uint32_t *tmp = (uint32_t *)&raw_data[offset];
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info->TotalFrames = swap32(*tmp);
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offset += 4;
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}
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else {
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return 0;
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}
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// extract total number of bytes in file
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if (head->flags & BYTES_FLAG) {
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uint32_t *tmp = (uint32_t *)&raw_data[offset];
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info->TotalBytes = swap32(*tmp);
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offset += 4;
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}
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// extract TOC
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if (head->flags & TOC_FLAG) {
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memcpy(info->TOC, &raw_data[offset], sizeof(info->TOC));
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offset += sizeof(info->TOC);
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}
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// extract quality status
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if (head->flags & VBR_SCALE_FLAG) {
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info->Quality = raw_data[offset + 3];
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}
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return 1;
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}
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else {
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return 0;
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}
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}
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