diff options
Diffstat (limited to 'plugins/alac/stream.c')
| -rw-r--r-- | plugins/alac/stream.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/plugins/alac/stream.c b/plugins/alac/stream.c new file mode 100644 index 00000000..cb969dd0 --- /dev/null +++ b/plugins/alac/stream.c @@ -0,0 +1,186 @@ +/* + * ALAC (Apple Lossless Audio Codec) decoder + * Copyright (c) 2005 David Hammerton + * All rights reserved. + * + * Basic stream reading + * + * http://crazney.net/programs/itunes/alac.html + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + */ + + +#include <stdlib.h> +#include <errno.h> +#include <string.h> +#ifdef _WIN32 + #include "stdint_win.h" +#else + #include <stdint.h> +#endif + +#include "stream.h" + +extern DB_functions_t *deadbeef; + +#define _Swap32(v) do { \ + v = (((v) & 0x000000FF) << 0x18) | \ + (((v) & 0x0000FF00) << 0x08) | \ + (((v) & 0x00FF0000) >> 0x08) | \ + (((v) & 0xFF000000) >> 0x18); } while(0) + +#define _Swap16(v) do { \ + v = (((v) & 0x00FF) << 0x08) | \ + (((v) & 0xFF00) >> 0x08); } while (0) + +extern int host_bigendian; + +struct stream_tTAG { + DB_FILE *f; + int bigendian; + int eof; + int64_t junk_offset; +}; + +void stream_read(stream_t *stream, size_t size, void *buf) +{ + size_t ret; + + ret = deadbeef->fread(buf, 4, size >> 2, stream->f) * 4; + ret += deadbeef->fread((char*)buf + ret, 1, size - ret, stream->f); + + if (ret == 0 && size != 0) stream->eof = 1; +} + +int32_t stream_read_int32(stream_t *stream) +{ + int32_t v; + stream_read(stream, 4, &v); + if ((stream->bigendian && !host_bigendian) || + (!stream->bigendian && host_bigendian)) + { + _Swap32(v); + } + return v; +} + +uint32_t stream_read_uint32(stream_t *stream) +{ + uint32_t v; + stream_read(stream, 4, &v); + if ((stream->bigendian && !host_bigendian) || + (!stream->bigendian && host_bigendian)) + { + _Swap32(v); + } + return v; +} + +int16_t stream_read_int16(stream_t *stream) +{ + int16_t v; + stream_read(stream, 2, &v); + if ((stream->bigendian && !host_bigendian) || + (!stream->bigendian && host_bigendian)) + { + _Swap16(v); + } + return v; +} + +uint16_t stream_read_uint16(stream_t *stream) +{ + uint16_t v; + stream_read(stream, 2, &v); + if ((stream->bigendian && !host_bigendian) || + (!stream->bigendian && host_bigendian)) + { + _Swap16(v); + } + return v; +} + +int8_t stream_read_int8(stream_t *stream) +{ + int8_t v; + stream_read(stream, 1, &v); + return v; +} + +uint8_t stream_read_uint8(stream_t *stream) +{ + uint8_t v; + stream_read(stream, 1, &v); + return v; +} + + +void stream_skip(stream_t *stream, int64_t skip) +{ + if (deadbeef->fseek(stream->f, skip, SEEK_CUR) == 0) return; + if (errno == ESPIPE) + { + char *buffer = malloc(skip); + stream_read(stream, skip, buffer); + free(buffer); + } +} + +int stream_eof(stream_t *stream) +{ + return stream->eof; +} + +int64_t stream_tell(stream_t *stream) +{ + int64_t res = deadbeef->ftell(stream->f); /* returns -1 on error */ + if (res < 0) { + return res; + } + return res - stream->junk_offset; +} + +int64_t stream_setpos(stream_t *stream, int64_t pos) +{ + return deadbeef->fseek(stream->f, pos + stream->junk_offset, SEEK_SET); +} + +stream_t *stream_create_file(DB_FILE *file, int bigendian, int64_t junk_offset) +{ + stream_t *new_stream; + + new_stream = (stream_t*)malloc(sizeof(stream_t)); + memset (new_stream, 0, sizeof (new_stream)); + new_stream->f = file; + new_stream->bigendian = bigendian; + new_stream->eof = 0; + new_stream->junk_offset = 0;//junk_offset; + + return new_stream; +} + +void stream_destroy(stream_t *stream) +{ + free(stream); +} + |