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On some platforms, libavcodec wants the output buffer aligned to 16
bytes (because it uses SSE/Altivec internally). It will segfault when
you don't obey this rule.
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Convert the metadata with the libavformat function av_metadata_conv().
This ensures that canonical tag names are provided by libavformat, and
we can remove the "artist" vs "author" workaround.
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Usually, we read our "artist" tag from ffmpeg's "author" tag. In some
cases however (e.g. APE), this tag is named "artist". This patch
implements a fallback: if no "author" is found, MPD tries to use
"artist".
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This warning is useless. I assume the author added it for debugging
purposes.
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This updates the copyright header to all be the same, which is
pretty much an update of where to mail request for a copy of the GPL
and the years of the MPD project. This also puts all committers under
'The Music Player Project' umbrella. These entries should go
individually in the AUTHORS file, for consistancy.
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implemetation
function was implemented in the version we are comparing to so there must be higher or equal
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After much research[1][2][3] this should be the majority of currently
supported file extensions and mime-types for the currently supported
ffmpeg formats. This list maybe incomplete, but it's more complete
than anything else out there that I've been able to find. This list
needs to be updated every now and again as the ffmpeg sources support
more formats.
1. Sources
2. wiki.multimedia.cx
3. filext.com
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Preparing for per-plugin configuration sections in mpd.conf.
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The ffmpeg library supports the "True Audio Codec". The entry in
ffmpeg_suffixes was missing.
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The "current" variable is used for calculating the seek destination,
and was declared as "int". With very long song files, the 32 bit
integer can overflow. ffmpeg expects an int64_t, which is very
unlikely to overflow. Switch to int64_t.
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When ffmpeg cannot estimate the elapsed time, it sets
AVPacket.pts=AV_NOPTS_VALUE. Our ffmpeg decoder plugin did not check
for that special value.
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If avcodec_decode_audio2() returns no output for an AVPacket,
libavcodec may buffer some data, and return a larger chunk of output
later. This patch disables a lot of bogus warnings.
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Output the name of the codec as a debug message. During my tests,
ffmpeg never filled this struct member, but it may do so in the past,
and this debug message might become helpful.
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ffmpeg_tag_internal() does not look for a few tags that mpd
supports. Most noteably:
comment -> TAG_ITEM_COMMENT -> Description
genre -> TAG_ITEM_GENRE -> WM/Genre (not WM/GenreID)
year -> TAG_ITEM_DATE -> WM/Year
I *think* that this is the last of the tags that AVFormatContext() in
ffmpeg supports that mpd also uses.
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Use GLib's G_GNUC_UNUSED instead of gcc.h's mpd_unused.
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The old code casted it to a 32 bit integer, which cut off bits.
AVFormatContext.duration is a int64_t, so use this type.
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Use NULL instead. Found by sparse.
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Refuse to play audio formats which are not supported by MPD.
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The ffmpeg library provides some of the song metadata in the
AVFormatContext struct. Pass it from there to MPD.
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With whence==AVSEEK_SIZE, the seek function should return the file
size, not the current offset. Check the return value of
input_stream_seek().
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The stream_decode() and file_decode() methods returned a boolean,
indicating whether they were able to decode the song. This is
redundant, since we already know that: if decoder_initialized() has
been called (and dc.state==DECODE), the plugin succeeded. Change both
methods to return void.
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Instead of having a seprate try_decode() method, let the
stream_decode() and file_decode() methods decide whether they are able
to decode the song.
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Instead of checking the stream_types bit set, we can simply check
whether the methods stream_decode() and file_decode() are implemented.
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The function decoder_read() already cares about the decoder command,
and loops until data is available. Reduced mpd_ffmpeg_read() to no
more than the decoder_read() call.
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That variable is never used except during initialization in
ffmpeg_helper().
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Renamed variables.
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ffmpeg_tag() deleted the tag when ffmpeg_helper() returned success.
The return value was interpreted incorrectly, it should return the tag
on success.
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Rewinding the stream here is not useful, but may consume valuable
resources (and time).
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decoder_read() checks the decoder command. Without this patch, the
ffmpeg plugin could become unresponsive.
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Ogg and ffmpeg detection was disabled when the stream was not
seekable, because the detection was too expensive. Since the curl
input stream can now rewind the stream cheaply, we can re-enable
detection on streams.
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Don't pass the "seekable" flag with every decoder_data() invocation.
Since that flag won't change within the file, it is enough to pass it
to decoder_initialized() once per file.
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The strings were constant, but the pointers weren't. C syntax is
somewhat tricky..
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All decoder_plugin structs are initialized at compile time, and must
never change.
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decoder_data() uses wait times to let the input stream continue its
transfer.
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decoder_data() always returns the current command. If we use this, we
can save a lot of decoder_get_command() calls.
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Converted the runtime check to an assertion.
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Remove one indent level.
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Move code from ffmpeg_decode_internal() to make it smaller and more
readable.
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The decoder API provides the function decoder_seek_error() to report
seek errors. Use this function instead of logging the error.
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