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some more seek helpers

This commit is contained in:
Adam D. Ruppe 2022-12-06 09:10:10 -05:00
parent 293f9ce2a8
commit e6eac2c2cf
1 changed files with 15 additions and 2 deletions
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17
mp3.d
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@ -53,7 +53,7 @@ class MP3Decoder {
alias ReadBufFn = int delegate (void[] buf); alias ReadBufFn = int delegate (void[] buf);
private int delegate (ubyte[] buf) reader; private int delegate (ubyte[] buf) reader;
private int delegate(size_t where) seeker; private int delegate(ulong where) seeker;
private mp3dec_io_t io; private mp3dec_io_t io;
@ -90,7 +90,7 @@ class MP3Decoder {
I realize these are all breaking changes, but the fix is easy and the new functionality, I realize these are all breaking changes, but the fix is easy and the new functionality,
the [seek] function among others, is worth it. To me anyway, and I hope for you too. the [seek] function among others, is worth it. To me anyway, and I hope for you too.
+/ +/
this (int delegate (ubyte[] buf) reader, int delegate(size_t where) seeker) { this (int delegate (ubyte[] buf) reader, int delegate(ulong where) seeker) {
if (reader is null) if (reader is null)
throw new Exception("reader is null"); throw new Exception("reader is null");
if (seeker is null) if (seeker is null)
@ -234,6 +234,17 @@ class MP3Decoder {
return (valid ? dec.info.bitrate_kbps : 0); return (valid ? dec.info.bitrate_kbps : 0);
} }
/++
Returns the duration of the mp3, in seconds, if available, or `float.nan` if it is unknown
(unknown may happen because it is an unseekable stream without metadata).
History:
Added November 26, 2022 (dub v10.10)
+/
@property float duration() const pure nothrow @safe @nogc {
return (valid ? (cast(float) dec.samples / sampleRate / channels) : float.nan);
}
/++ /++
Returns the number of samples in the current frame, as prepared by [decodeNextFrame]. Returns the number of samples in the current frame, as prepared by [decodeNextFrame].
@ -257,6 +268,8 @@ class MP3Decoder {
Is you want something that never allocates, see [frameSamplesFloat]. Is you want something that never allocates, see [frameSamplesFloat].
Please note that you MUST call [decodeNextFrame] first.
See_Also: See_Also:
[frameSamplesFloat], [decodeNextFrame] [frameSamplesFloat], [decodeNextFrame]