Commit 68ebc894 authored by Committed by Timothy B. Terriberry
Fix reading maximum, nominal, minimum bitrate in _vorbis_unpack_info().
https://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-630004.2.2 specifies these fields as 32bit signed. oggpack_read(opb,32), which is used to read these fields, returns 32 bits stored in a long. On architectures where long is 64bit, this results in a positive value being returned. This value is then stored in struct vorbis_info in bitrate_upper, bitrate_nominal and bitrate_lower, also as long. ogginfo relies on these values in order to display the respective header fields and thus misrepresented the stored value -1 (which has the intended meaning of "bitrate not set") as 2**32-1 on architectures where long is 64bit. Explicitly cast the return value of oggpack_read() to a signed 32bit integer type. A nominal bitrate value of -1 is valid as per specification, and is written by libvorbis for VBR files with samplerate >= 50000Hz. Signed-off-by: Timothy B. Terriberry <email@example.com>
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