New SoundSource/AudioSource API

…onBuild

Fix Windows build (SoundSourceMediaFoundation)

mp3: Workaround for different sample rates in on file

SoundSourceProxyTest.seekForward was failing on OSX due to
cover-test.mp3 not producing accurate samples on a seek. It seems this
is related to the MP3 decoder not being "primed" right after a seek. To
compensate for this, we seek backwards 29 MP3 frames (same as in
SoundSourceMp3) and read forward.

The test passes now but it would be ideal if we had a reliable way to
determine the right amount to read on a per-file basis from ExtAudioFile
directly (in case other formats need pre-fetching). I'm following up
with Apple support for help here.

Add "stabilization read" to MP3 seeks in SoundSourceCoreAudio.

The decoding functions do NOT return the actual error code!! Instead
the error code must be read from mad_stream if the decoding functions
returned != 0.

This caused some really ugly sounds at the beginning of some MP3 files,
because frames were not skipped as suppossed to be.

Slightly more code, but hopefully easier to understand.

MP3 channel and decoding fix

*** CID 61970:  Uninitialized members  (UNINIT_CTOR)
/src/sources/soundsourcesndfile.cpp: 17 in Mixxx::SoundSourceSndFile::SoundSourceSndFile(QUrl)()
11         return list;
12     }
13
14     SoundSourceSndFile::SoundSourceSndFile(QUrl url)
15             : SoundSource(url),
16               m_pSndFile(NULL) {
>>>     CID 61970:  Uninitialized members  (UNINIT_CTOR)
>>>     Non-static class member field "m_sfInfo.seekable" is not initialized in this constructor nor in any functions that it calls.
17     }
18
19     SoundSourceSndFile::~SoundSourceSndFile() {
20         close();
21     }

*** CID 61968:  Uninitialized members  (UNINIT_CTOR)
/src/sources/soundsourcemp3.cpp: 163 in Mixxx::SoundSourceMp3::SoundSourceMp3(QUrl)()
157               m_fileSize(0),
158               m_pFileData(NULL),
159               m_avgSeekFrameCount(0),
160               m_curFrameIndex(kFrameIndexMin),
161               m_madSynthCount(0) {
162         m_seekFrameList.reserve(kSeekFrameListCapacity);
>>>     CID 61968:  Uninitialized members  (UNINIT_CTOR)
>>>     Non-static class member field "m_madSynth.pcm" is not initialized in this constructor nor in any functions that it calls.
163     }
164
165     SoundSourceMp3::~SoundSourceMp3() {
166         close();
167     }

…undSources

Fix coverity warnings for new SoundSources

…ct_stereo

Observed for some .m4a files when TagLib failed to access (read/write) the
existing MP4 tag.

…to pan_effect_stereo

Writing Tags: Handle inaccessible tags correctly

fix Windows build

…ct_stereo

…ixes Bug #1450260

…ct_stereo

https://bugs.launchpad.net/mixxx/+bug/1452005

AudioSource API Code Cleanup

…ct_stereo

Conflicts:
	src/test/mixxxtest.cpp

A simple C++ API that reduces the chance of memory leaks that were
imminent in the previous C/C++ version. Error handling and logging
in SoundSourceProxy while loading plugins has been improved.

This might happen for corrupt/truncated files. Currently there is no
special case handling in CachingReader. Partially (= incomplete) read
chunks are simply treated like successfully (= complete) read chunks.

Without this fix the CachingReader tried to read the remaining samples
in the last chunk of a corrupt MP3 file over and over.

…ments

SoundSourceProvider is a generic interface that will implemented both by
plugin libraries as well as built-in sound sources. This will simplify
the selection of an appropriate SoundSource in SoundSourceProxy and is
useful for future extensions like selecting one out of multiple providers
for each file type.

…ct_stereo

pan delay per sample with linear stretching

….com/demos/mixxx into pan_effect_stereo