godot/thirdparty/minimp3/minimp3_ex.h

#ifndef MINIMP3_EXT_H
#define MINIMP3_EXT_H
/*
    https://github.com/lieff/minimp3
    To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public domain worldwide.
    This software is distributed without any warranty.
    See <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#include <stddef.h>
#include "minimp3.h"

/* flags for mp3dec_ex_open_* functions */
#define MP3D_SEEK_TO_BYTE …
#define MP3D_SEEK_TO_SAMPLE …
#define MP3D_DO_NOT_SCAN …
#ifdef MINIMP3_ALLOW_MONO_STEREO_TRANSITION
#define MP3D_ALLOW_MONO_STEREO_TRANSITION …
#define MP3D_FLAGS_MASK …
#else
#define MP3D_FLAGS_MASK …
#endif

/* compile-time config */
#define MINIMP3_PREDECODE_FRAMES …
/*#define MINIMP3_SEEK_IDX_LINEAR_SEARCH*/ /* define to use linear index search instead of binary search on seek */
#define MINIMP3_IO_SIZE …
#define MINIMP3_BUF_SIZE …
/*#define MINIMP3_SCAN_LIMIT (256*1024)*/ /* how many bytes will be scanned to search first valid mp3 frame, to prevent stall on large non-mp3 files */
#define MINIMP3_ENABLE_RING …

/* return error codes */
#define MP3D_E_PARAM …
#define MP3D_E_MEMORY …
#define MP3D_E_IOERROR …
#define MP3D_E_USER …
#define MP3D_E_DECODE …

mp3dec_file_info_t;

mp3dec_map_info_t;

mp3dec_frame_t;

mp3dec_index_t;

MP3D_READ_CB;
MP3D_SEEK_CB;

mp3dec_io_t;

mp3dec_ex_t;

MP3D_ITERATE_CB;
MP3D_PROGRESS_CB;

#ifdef __cplusplus
extern "C" {
#endif

/* detect mp3/mpa format */
int mp3dec_detect_buf(const uint8_t *buf, size_t buf_size);
int mp3dec_detect_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size);
/* decode whole buffer block */
int mp3dec_load_buf(mp3dec_t *dec, const uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
int mp3dec_load_cb(mp3dec_t *dec, mp3dec_io_t *io, uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
/* iterate through frames */
int mp3dec_iterate_buf(const uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data);
int mp3dec_iterate_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data);
/* streaming decoder with seeking capability */
int mp3dec_ex_open_buf(mp3dec_ex_t *dec, const uint8_t *buf, size_t buf_size, int flags);
int mp3dec_ex_open_cb(mp3dec_ex_t *dec, mp3dec_io_t *io, int flags);
void mp3dec_ex_close(mp3dec_ex_t *dec);
int mp3dec_ex_seek(mp3dec_ex_t *dec, uint64_t position);
size_t mp3dec_ex_read_frame(mp3dec_ex_t *dec, mp3d_sample_t **buf, mp3dec_frame_info_t *frame_info, size_t max_samples);
size_t mp3dec_ex_read(mp3dec_ex_t *dec, mp3d_sample_t *buf, size_t samples);
#ifndef MINIMP3_NO_STDIO
/* stdio versions of file detect, load, iterate and stream */
int mp3dec_detect(const char *file_name);
int mp3dec_load(mp3dec_t *dec, const char *file_name, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
int mp3dec_iterate(const char *file_name, MP3D_ITERATE_CB callback, void *user_data);
int mp3dec_ex_open(mp3dec_ex_t *dec, const char *file_name, int flags);
#ifdef _WIN32
int mp3dec_detect_w(const wchar_t *file_name);
int mp3dec_load_w(mp3dec_t *dec, const wchar_t *file_name, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
int mp3dec_iterate_w(const wchar_t *file_name, MP3D_ITERATE_CB callback, void *user_data);
int mp3dec_ex_open_w(mp3dec_ex_t *dec, const wchar_t *file_name, int flags);
#endif
#endif

#ifdef __cplusplus
}
#endif
#endif /*MINIMP3_EXT_H*/

#if defined(MINIMP3_IMPLEMENTATION) && !defined(_MINIMP3_EX_IMPLEMENTATION_GUARD)
#define _MINIMP3_EX_IMPLEMENTATION_GUARD
#include <limits.h>
#include "minimp3.h"

static void mp3dec_skip_id3v1(const uint8_t *buf, size_t *pbuf_size)
{ … }

static size_t mp3dec_skip_id3v2(const uint8_t *buf, size_t buf_size)
{ … }

static void mp3dec_skip_id3(const uint8_t **pbuf, size_t *pbuf_size)
{ … }

static int mp3dec_check_vbrtag(const uint8_t *frame, int frame_size, uint32_t *frames, int *delay, int *padding)
{ … }

int mp3dec_detect_buf(const uint8_t *buf, size_t buf_size)
{ … }

int mp3dec_detect_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size)
{ … }

int mp3dec_load_buf(mp3dec_t *dec, const uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data)
{ … }

int mp3dec_load_cb(mp3dec_t *dec, mp3dec_io_t *io, uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data)
{ … }

int mp3dec_iterate_buf(const uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data)
{ … }

int mp3dec_iterate_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data)
{ … }

static int mp3dec_load_index(void *user_data, const uint8_t *frame, int frame_size, int free_format_bytes, size_t buf_size, uint64_t offset, mp3dec_frame_info_t *info)
{ … }

int mp3dec_ex_open_buf(mp3dec_ex_t *dec, const uint8_t *buf, size_t buf_size, int flags)
{ … }

#ifndef MINIMP3_SEEK_IDX_LINEAR_SEARCH
static size_t mp3dec_idx_binary_search(mp3dec_index_t *idx, uint64_t position)
{ … }
#endif

int mp3dec_ex_seek(mp3dec_ex_t *dec, uint64_t position)
{ … }

size_t mp3dec_ex_read_frame(mp3dec_ex_t *dec, mp3d_sample_t **buf, mp3dec_frame_info_t *frame_info, size_t max_samples)
{ … }

size_t mp3dec_ex_read(mp3dec_ex_t *dec, mp3d_sample_t *buf, size_t samples)
{ … }

int mp3dec_ex_open_cb(mp3dec_ex_t *dec, mp3dec_io_t *io, int flags)
{ … }


#ifndef MINIMP3_NO_STDIO

#if defined(__linux__) || defined(__FreeBSD__)
#include <errno.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#if !defined(_GNU_SOURCE)
#include <sys/ipc.h>
#include <sys/shm.h>
#endif
#if !defined(MAP_POPULATE) && defined(__linux__)
#define MAP_POPULATE …
#elif !defined(MAP_POPULATE)
#define MAP_POPULATE …
#endif

static void mp3dec_close_file(mp3dec_map_info_t *map_info)
{
    if (map_info->buffer && MAP_FAILED != map_info->buffer)
        munmap((void *)map_info->buffer, map_info->size);
    map_info->buffer = 0;
    map_info->size   = 0;
}

static int mp3dec_open_file(const char *file_name, mp3dec_map_info_t *map_info)
{
    if (!file_name)
        return MP3D_E_PARAM;
    int file;
    struct stat st;
    memset(map_info, 0, sizeof(*map_info));
retry_open:
    file = open(file_name, O_RDONLY);
    if (file < 0 && (errno == EAGAIN || errno == EINTR))
        goto retry_open;
    if (file < 0 || fstat(file, &st) < 0)
    {
        close(file);
        return MP3D_E_IOERROR;
    }

    map_info->size = st.st_size;
retry_mmap:
    map_info->buffer = (const uint8_t *)mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE | MAP_POPULATE, file, 0);
    if (MAP_FAILED == map_info->buffer && (errno == EAGAIN || errno == EINTR))
        goto retry_mmap;
    close(file);
    if (MAP_FAILED == map_info->buffer)
        return MP3D_E_IOERROR;
    return 0;
}

#if MINIMP3_ENABLE_RING && defined(__linux__) && defined(_GNU_SOURCE)
#define MINIMP3_HAVE_RING
static void mp3dec_close_ring(mp3dec_map_info_t *map_info)
{
#if defined(__linux__) && defined(_GNU_SOURCE)
    if (map_info->buffer && MAP_FAILED != map_info->buffer)
        munmap((void *)map_info->buffer, map_info->size*2);
#else
    if (map_info->buffer)
    {
        shmdt(map_info->buffer);
        shmdt(map_info->buffer + map_info->size);
    }
#endif
    map_info->buffer = 0;
    map_info->size   = 0;
}

static int mp3dec_open_ring(mp3dec_map_info_t *map_info, size_t size)
{
    int memfd, page_size;
#if defined(__linux__) && defined(_GNU_SOURCE)
    void *buffer;
    int res;
#endif
    memset(map_info, 0, sizeof(*map_info));

#ifdef _SC_PAGESIZE
    page_size = sysconf(_SC_PAGESIZE);
#else
    page_size = getpagesize();
#endif
    map_info->size = (size + page_size - 1)/page_size*page_size;

#if defined(__linux__) && defined(_GNU_SOURCE)
    memfd = memfd_create("mp3_ring", 0);
    if (memfd < 0)
        return MP3D_E_MEMORY;

retry_ftruncate:
    res = ftruncate(memfd, map_info->size);
    if (res && (errno == EAGAIN || errno == EINTR))
        goto retry_ftruncate;
    if (res)
        goto error;

retry_mmap:
    map_info->buffer = (const uint8_t *)mmap(NULL, map_info->size*2, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
    if (MAP_FAILED == map_info->buffer && (errno == EAGAIN || errno == EINTR))
        goto retry_mmap;
    if (MAP_FAILED == map_info->buffer || !map_info->buffer)
        goto error;
retry_mmap2:
    buffer = mmap((void *)map_info->buffer, map_info->size, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, memfd, 0);
    if (MAP_FAILED == map_info->buffer && (errno == EAGAIN || errno == EINTR))
        goto retry_mmap2;
    if (MAP_FAILED == map_info->buffer || buffer != (void *)map_info->buffer)
        goto error;
retry_mmap3:
    buffer = mmap((void *)map_info->buffer + map_info->size, map_info->size, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, memfd, 0);
    if (MAP_FAILED == map_info->buffer && (errno == EAGAIN || errno == EINTR))
        goto retry_mmap3;
    if (MAP_FAILED == map_info->buffer || buffer != (void *)(map_info->buffer + map_info->size))
        goto error;

    close(memfd);
    return 0;
error:
    close(memfd);
    mp3dec_close_ring(map_info);
    return MP3D_E_MEMORY;
#else
    memfd = shmget(IPC_PRIVATE, map_info->size, IPC_CREAT | 0700);
    if (memfd < 0)
        return MP3D_E_MEMORY;
retry_mmap:
    map_info->buffer = (const uint8_t *)mmap(NULL, map_info->size*2, PROT_NONE, MAP_PRIVATE, -1, 0);
    if (MAP_FAILED == map_info->buffer && (errno == EAGAIN || errno == EINTR))
        goto retry_mmap;
    if (MAP_FAILED == map_info->buffer)
        goto error;
    if (map_info->buffer != shmat(memfd, map_info->buffer, 0))
        goto error;
    if ((map_info->buffer + map_info->size) != shmat(memfd, map_info->buffer + map_info->size, 0))
        goto error;
    if (shmctl(memfd, IPC_RMID, NULL) < 0)
        return MP3D_E_MEMORY;
    return 0;
error:
    shmctl(memfd, IPC_RMID, NULL);
    mp3dec_close_ring(map_info);
    return MP3D_E_MEMORY;
#endif
}
#endif /*MINIMP3_ENABLE_RING*/
#elif defined(_WIN32)
#include <windows.h>

static void mp3dec_close_file(mp3dec_map_info_t *map_info)
{
    if (map_info->buffer)
        UnmapViewOfFile(map_info->buffer);
    map_info->buffer = 0;
    map_info->size   = 0;
}

static int mp3dec_open_file_h(HANDLE file, mp3dec_map_info_t *map_info)
{
    memset(map_info, 0, sizeof(*map_info));

    HANDLE mapping = NULL;
    LARGE_INTEGER s;
    s.LowPart = GetFileSize(file, (DWORD*)&s.HighPart);
    if (s.LowPart == INVALID_FILE_SIZE && GetLastError() != NO_ERROR)
        goto error;
    map_info->size = s.QuadPart;

    mapping = CreateFileMapping(file, NULL, PAGE_READONLY, 0, 0, NULL);
    if (!mapping)
        goto error;
    map_info->buffer = (const uint8_t*)MapViewOfFile(mapping, FILE_MAP_READ, 0, 0, s.QuadPart);
    CloseHandle(mapping);
    if (!map_info->buffer)
        goto error;

    CloseHandle(file);
    return 0;
error:
    mp3dec_close_file(map_info);
    CloseHandle(file);
    return MP3D_E_IOERROR;
}

static int mp3dec_open_file(const char *file_name, mp3dec_map_info_t *map_info)
{
    if (!file_name)
        return MP3D_E_PARAM;
    HANDLE file = CreateFileA(file_name, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0);
    if (INVALID_HANDLE_VALUE == file)
        return MP3D_E_IOERROR;
    return mp3dec_open_file_h(file, map_info);
}

static int mp3dec_open_file_w(const wchar_t *file_name, mp3dec_map_info_t *map_info)
{
    if (!file_name)
        return MP3D_E_PARAM;
    HANDLE file = CreateFileW(file_name, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0);
    if (INVALID_HANDLE_VALUE == file)
        return MP3D_E_IOERROR;
    return mp3dec_open_file_h(file, map_info);
}
#else
#include <stdio.h>

static void mp3dec_close_file(mp3dec_map_info_t *map_info)
{
    if (map_info->buffer)
        free((void *)map_info->buffer);
    map_info->buffer = 0;
    map_info->size = 0;
}

static int mp3dec_open_file(const char *file_name, mp3dec_map_info_t *map_info)
{
    if (!file_name)
        return MP3D_E_PARAM;
    memset(map_info, 0, sizeof(*map_info));
    FILE *file = fopen(file_name, "rb");
    if (!file)
        return MP3D_E_IOERROR;
    int res = MP3D_E_IOERROR;
    long size = -1;
    if (fseek(file, 0, SEEK_END))
        goto error;
    size = ftell(file);
    if (size < 0)
        goto error;
    map_info->size = (size_t)size;
    if (fseek(file, 0, SEEK_SET))
        goto error;
    map_info->buffer = (uint8_t *)malloc(map_info->size);
    if (!map_info->buffer)
    {
        res = MP3D_E_MEMORY;
        goto error;
    }
    if (fread((void *)map_info->buffer, 1, map_info->size, file) != map_info->size)
        goto error;
    fclose(file);
    return 0;
error:
    mp3dec_close_file(map_info);
    fclose(file);
    return res;
}
#endif

static int mp3dec_detect_mapinfo(mp3dec_map_info_t *map_info)
{
    int ret = mp3dec_detect_buf(map_info->buffer, map_info->size);
    mp3dec_close_file(map_info);
    return ret;
}

static int mp3dec_load_mapinfo(mp3dec_t *dec, mp3dec_map_info_t *map_info, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data)
{
    int ret = mp3dec_load_buf(dec, map_info->buffer, map_info->size, info, progress_cb, user_data);
    mp3dec_close_file(map_info);
    return ret;
}

static int mp3dec_iterate_mapinfo(mp3dec_map_info_t *map_info, MP3D_ITERATE_CB callback, void *user_data)
{
    int ret = mp3dec_iterate_buf(map_info->buffer, map_info->size, callback, user_data);
    mp3dec_close_file(map_info);
    return ret;
}

static int mp3dec_ex_open_mapinfo(mp3dec_ex_t *dec, int flags)
{
    int ret = mp3dec_ex_open_buf(dec, dec->file.buffer, dec->file.size, flags);
    dec->is_file = 1;
    if (ret)
        mp3dec_ex_close(dec);
    return ret;
}

int mp3dec_detect(const char *file_name)
{
    int ret;
    mp3dec_map_info_t map_info;
    if ((ret = mp3dec_open_file(file_name, &map_info)))
        return ret;
    return mp3dec_detect_mapinfo(&map_info);
}

int mp3dec_load(mp3dec_t *dec, const char *file_name, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data)
{
    int ret;
    mp3dec_map_info_t map_info;
    if ((ret = mp3dec_open_file(file_name, &map_info)))
        return ret;
    return mp3dec_load_mapinfo(dec, &map_info, info, progress_cb, user_data);
}

int mp3dec_iterate(const char *file_name, MP3D_ITERATE_CB callback, void *user_data)
{
    int ret;
    mp3dec_map_info_t map_info;
    if ((ret = mp3dec_open_file(file_name, &map_info)))
        return ret;
    return mp3dec_iterate_mapinfo(&map_info, callback, user_data);
}

int mp3dec_ex_open(mp3dec_ex_t *dec, const char *file_name, int flags)
{
    int ret;
    if (!dec)
        return MP3D_E_PARAM;
    if ((ret = mp3dec_open_file(file_name, &dec->file)))
        return ret;
    return mp3dec_ex_open_mapinfo(dec, flags);
}

void mp3dec_ex_close(mp3dec_ex_t *dec)
{
#ifdef MINIMP3_HAVE_RING
    if (dec->io)
        mp3dec_close_ring(&dec->file);
#else
    if (dec->io && dec->file.buffer)
        free((void*)dec->file.buffer);
#endif
    if (dec->is_file)
        mp3dec_close_file(&dec->file);
    if (dec->index.frames)
        free(dec->index.frames);
    memset(dec, 0, sizeof(*dec));
}

#ifdef _WIN32
int mp3dec_detect_w(const wchar_t *file_name)
{
    int ret;
    mp3dec_map_info_t map_info;
    if ((ret = mp3dec_open_file_w(file_name, &map_info)))
        return ret;
    return mp3dec_detect_mapinfo(&map_info);
}

int mp3dec_load_w(mp3dec_t *dec, const wchar_t *file_name, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data)
{
    int ret;
    mp3dec_map_info_t map_info;
    if ((ret = mp3dec_open_file_w(file_name, &map_info)))
        return ret;
    return mp3dec_load_mapinfo(dec, &map_info, info, progress_cb, user_data);
}

int mp3dec_iterate_w(const wchar_t *file_name, MP3D_ITERATE_CB callback, void *user_data)
{
    int ret;
    mp3dec_map_info_t map_info;
    if ((ret = mp3dec_open_file_w(file_name, &map_info)))
        return ret;
    return mp3dec_iterate_mapinfo(&map_info, callback, user_data);
}

int mp3dec_ex_open_w(mp3dec_ex_t *dec, const wchar_t *file_name, int flags)
{
    int ret;
    if ((ret = mp3dec_open_file_w(file_name, &dec->file)))
        return ret;
    return mp3dec_ex_open_mapinfo(dec, flags);
}
#endif
#else /* MINIMP3_NO_STDIO */
void mp3dec_ex_close(mp3dec_ex_t *dec)
{ … }
#endif

#endif /* MINIMP3_IMPLEMENTATION && !_MINIMP3_EX_IMPLEMENTATION_GUARD */