diff options
Diffstat (limited to 'src/demuxers/id3.h')
| -rw-r--r-- | src/demuxers/id3.h | 40 |
1 files changed, 34 insertions, 6 deletions
diff --git a/src/demuxers/id3.h b/src/demuxers/id3.h index 9d08f6817..b8f0984b1 100644 --- a/src/demuxers/id3.h +++ b/src/demuxers/id3.h @@ -170,6 +170,10 @@ int id3v2_parse_tag(input_plugin_t *input, xine_stream_t *stream, int8_t *mp3_frame_header); +/** + * @brief Checks if the given buffer is an ID3 tag preamble + * @param ptr Pointer to the first 10 bytes of the ID3 tag + */ static inline int id3v2_istag(uint8_t *ptr) { return (ptr[0] == 'I') && @@ -177,12 +181,36 @@ static inline int id3v2_istag(uint8_t *ptr) { (ptr[2] == '3'); } -static inline uint32_t id3v2_tagsize(uint8_t *ptr) { - return - ((uint32_t)ptr[0] << 21) + - ((uint32_t)ptr[1] << 14) + - ((uint32_t)ptr[2] << 7) + - (uint32_t)ptr[3]; +#if 0 +/* parse an unsynchronized 16bits integer */ +static inline uint16_t BE_16_synchsafe(uint8_t buf[2]) { + return ((uint16_t)(buf[0] & 0x7F) << 7) | + (uint16_t)(buf[1] & 0x7F); +} +#endif + +/* parse an unsynchronized 24bits integer */ +static inline uint32_t BE_24_synchsafe(uint8_t buf[3]) { + return ((uint32_t)(buf[0] & 0x7F) << 14) | + ((uint32_t)(buf[1] & 0x7F) << 7) | + (uint32_t)(buf[2] & 0x7F); +} + +/* parse an unsynchronized 32bits integer */ +static inline uint32_t BE_32_synchsafe(uint8_t buf[4]) { + return ((uint32_t)(buf[0] & 0x7F) << 21) | + ((uint32_t)(buf[1] & 0x7F) << 14) | + ((uint32_t)(buf[2] & 0x7F) << 7) | + (uint32_t)(buf[3] & 0x7F); +} + +/* parse an unsynchronized 35bits integer */ +static inline uint32_t BE_35_synchsafe(uint8_t buf[5]) { + return ((uint32_t)(buf[0] & 0x07) << 28) | + ((uint32_t)(buf[1] & 0x7F) << 21) | + ((uint32_t)(buf[2] & 0x7F) << 14) | + ((uint32_t)(buf[3] & 0x7F) << 7) | + (uint32_t)(buf[4] & 0x7F); } #endif /* ID3_H */ |