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01f59fa85f
heavily customized version of DUMB (Dynamic Universal Music Bibliotheque).
It has been slightly modified by me:
* Added support for Ogg Vorbis-compressed samples in XM files ala FMOD.
* Removed excessive mallocs from the replay core.
* Rerolled the loops in resample.c. Unrolling them made the object file
~250k large while providing little benefit. Even at ~100k, I think it's
still larger than it ought to be, but I'll live with it for now.
Other than that, it's essentially the same thing you'd hear in foobar2000,
minus some subsong detection features. Release builds of the library look
like they might even be slightly faster than FMOD, which is a plus.
- Fixed: Timidity::font_add() did not release the file reader it created.
- Fixed: The SF2 loader did not free the sample headers in its destructor.
SVN r995 (trunk)
281 lines
12 KiB
Text
281 lines
12 KiB
Text
/* _______ ____ __ ___ ___
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* \ _ \ \ / \ / \ \ / / ' ' '
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* | | \ \ | | || | \/ | . .
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* | | | | | | || ||\ /| |
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* | | | | | | || || \/ | | ' ' '
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* | | | | | | || || | | . .
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* | |_/ / \ \__// || | |
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* /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
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* / \
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* / . \
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* deprec.txt - Deprecated functions, why they / / \ \
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* were deprecated, and what to do | < / \_
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* instead. | \/ /\ /
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* \_ / > /
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* | \ / /
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* | ' /
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* \__/
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*/
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**********************************************
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*** How the functions have been deprecated ***
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**********************************************
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GCC 3.1 and later provide a very useful attribute. The following:
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__attribute__((__deprecated__))
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when written alongside a function prototype, variable declaration or type
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definition, will result in a warning from GCC if any such part of the API
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is used. The warning will even tell you where the declaration is, and I
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have inserted comments by all the deprecated declarations, telling you
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what to do.
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Unfortunately, GCC 2.x and 3.0.x and MSVC do not have any means to
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deprecate things. The approach I have taken with these compilers is to
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avoid prototyping the deprecated parts of the API. This means you will get
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warnings and errors, and they won't be very helpful. If your program
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compiles, you may get strange crashes when you run it, since the compiler
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needs the declarations in order to make sure function calls are carried
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out correctly.
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If you would like the deprecated parts of the API to be declared, you can
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compile with the -DDUMB_DECLARE_DEPRECATED switch for GCC, or the
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-D"DUMB_DECLARE_DEPRECATED" switch for MSVC. This will be accepted by
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GCC 3.x but is unnecessary. Use this switch with other people's projects
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if necessary, but please make the effort to update your own projects to
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use the new API, as the deprecated parts may be removed in the future.
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The rest of this file explains why some parts of the API were deprecated,
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and how to adapt your code.
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**************************************
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*** What happened to DUH_RENDERER? ***
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**************************************
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The DUH_RENDERER struct was designed for rendering audio to an end-user
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format - 8-bit or 16-bit, signed or unsigned, with stereo samples
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interleaved. In order for it to do this, it was built on top of the
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hitherto undocumented DUH_SIGRENDERER struct, which rendered audio in
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DUMB's internal 32-bit signed format with channels (left/right) stored
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separately. The DUH_RENDERER struct contained a pointer to a
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DUH_SIGRENDERER struct, along with some other data like the position and
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number of channels.
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There were then some developments in the API. The DUH_SIGRENDERER struct
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also stored the position and the number of channels, so I decided to write
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functions for returning these. Suddenly there was no need to store them in
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the DUH_RENDERER struct. Before long, the DUH_RENDERER struct contained
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nothing but a pointer to a DUH_SIGRENDERER.
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I decided it would be a good idea to unify the structs. After all, there
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really is no difference between the data stored in each, and it would be
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easy to make duh_render(DUH_RENDERER *dr, ...) and
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duh_render_signal(DUH_SIGRENDERER *sr, ...) work on the same type of
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struct. (Note that duh_render_signal() is now deprecated too; see the next
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section.) It took some deliberation, but I decided I didn't want functions
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to be #defined (it prevents you from using these names for member
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functions in C++ classes), and that meant they had to be defined
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somewhere. Defining redundant functions is a source of bloat, inefficiency
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and general inelegance. After weighing things up, I decided it was better
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to deprecate the redundant functions and have people begin to use the more
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efficient versions, and eventually the redundant functions will be able to
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be removed.
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So why did I choose to keep the more complicated name, DUH_SIGRENDERER?
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The reason has to do with what DUMB will become in the future. Signals are
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an inherent part of the DUH struct and how .duh files will be constructed.
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It will be possible to have multiple signals in a single DUH struct, and
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you will be able to choose which one you want to play (this is the 'sig'
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parameter passed to duh_start_sigrenderer()). But don't hold your breath;
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we still have a long way to go before .duh files will start to appear...
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typedef DUH_SIGRENDERER DUH_RENDERER;
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Wherever you are using DUH_RENDERER in your program, simply replace it
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with DUH_SIGRENDERER. An automated (case-sensitive!) search and replace
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operation should get this done.
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DUH_RENDERER *duh_start_renderer(DUH *duh, int n_channels, long pos);
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Use duh_start_sigrenderer() instead. It takes an extra parameter, 'sig',
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which comes after 'duh' and before 'n_channels'; pass 0 for this. So an
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example would be, replace:
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sr = duh_start_renderer(duh, 2, 0);
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with:
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sr = duh_start_sigrenderer(duh, 0, 2, 0);
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int duh_renderer_get_n_channels(DUH_RENDERER *dr);
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long duh_renderer_get_position(DUH_RENDERER *dr);
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void duh_end_renderer(DUH_RENDERER *dr);
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These are easy enough to fix; all you have to do is replace 'renderer'
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with 'sigrenderer'. So the new functions are:
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int duh_sigrenderer_get_n_channels(DUH_SIGRENDERER *sigrenderer);
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long duh_sigrenderer_get_position(DUH_SIGRENDERER *sigrenderer);
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void duh_end_sigrenderer(DUH_SIGRENDERER *sigrenderer);
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Note that duh_render() has NOT been deprecated. It now uses DUH_SIGRENDERER
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instead of DUH_RENDERER, but its functionality is unchanged. You do not have
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to change calls to this function in any way.
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DUH_RENDERER *duh_renderer_encapsulate_sigrenderer(DUH_SIGRENDERER *sr);
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DUH_SIGRENDERER *duh_renderer_get_sigrenderer(DUH_RENDERER *dr);
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DUH_SIGRENDERER *duh_renderer_decompose_to_sigrenderer(DUH_RENDERER *dr);
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These functions did not exist in the last release of DUMB, so you are
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probably not using them, but they are included here for completeness. All
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you have to do here is unwrap the function, since the structs have been
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unified. So, for instance, replace:
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duh_renderer_encapsulate_sigrenderer(my_sigrenderer)
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with:
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my_sigrenderer
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Simple!
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AL_DUH_PLAYER *al_duh_encapsulate_renderer(DUH_RENDERER *dr,
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float volume, long bufsize, int freq);
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DUH_RENDERER *al_duh_get_renderer(AL_DUH_PLAYER *dp);
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DUH_RENDERER *al_duh_decompose_to_renderer(AL_DUH_PLAYER *dp);
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Again, these functions were not in the last release, so you probably
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aren't using them. Nevertheless, the fix is simple as always: simply
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replace 'renderer' with 'sigrenderer'. So the new functions are:
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AL_DUH_PLAYER *al_duh_encapsulate_sigrenderer(DUH_SIGRENDERER *sr,
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float volume, long bufsize, int freq);
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DUH_SIGRENDERER *al_duh_get_sigrenderer(AL_DUH_PLAYER *dp);
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DUH_SIGRENDERER *al_duh_decompose_to_sigrenderer(AL_DUH_PLAYER *dp);
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*********************
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*** Miscellaneous ***
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*********************
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long duh_render_signal(DUH_SIGRENDERER *sigrenderer,
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float volume, float delta,
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long size, sample_t **samples);
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This function used to return samples in DUMB's internal format. This
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format consisted of 32-bit integers whose 'normal range' was -0x8000 to
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0x7FFF (any samples outside this range would have to be clipped when sent
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to the sound card).
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DUMB's internal format has changed. DUMB still uses 32-bit integers, but
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now the normal range is -0x800000 to 0x7FFFFF. The lowest eight bits are
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discarded at the final stage by duh_render() when you ask for 16-bit
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output. A new function, duh_sigrenderer_get_samples(), will return samples
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in DUMB's new internal format. It takes exactly the same parameters, so
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all you have to do to the call itself is change the name; however, you
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will most likely have to change your code to account for the new
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normalised range.
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duh_render_signal() will still be able to give you the samples in DUMB's
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old internal format, but it is inefficient. You should change your code as
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soon as possible.
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typedef void (*DUH_SIGRENDERER_CALLBACK)(void *data, sample_t **samples,
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int n_channels, long length);
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void duh_sigrenderer_set_callback(DUH_SIGRENDERER *sigrenderer,
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DUH_SIGRENDERER_CALLBACK callback, void *data);
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This callback was intended to allow you to analyse the output. It was by
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no means intended to let you modify the output. For this reason, the names
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have been changed to DUH_SIGRENDERER_ANALYSER_CALLBACK and
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duh_sigrenderer_set_analyser_callback, and the 'samples' parameter to your
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callback should now be specified as follows:
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const sample_t *const *samples
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The first 'const' indicates that you must not modify the samples. The
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second indicates that you must not modify the pointers to each channel.
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There is a second reason why this change was necessary, and it is the one
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described further up for duh_render_signal()'s entry: the format in which
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the samples themselves are stored has changed. They are 256 times as
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large, with a normal range from -0x800000 to 0x7FFFFF. You will most
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likely need to change your code to account for this.
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If you try to call the old function, it will print a message to stderr
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directing you to this file, and it will not install the callback. You
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shouldn't be able to get this far without a compiler warning (or, if you
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don't have GCC 3.1 or later, some compiler errors).
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If you wanted to use this callback to apply a DSP effect, don't worry;
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there is a better way of doing this. It is undocumented, so contact me
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and I shall try to help. Contact details are at the bottom of this file.
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For reference, here are the new definitions:
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typedef void (*DUH_SIGRENDERER_ANALYSER_CALLBACK)(void *data,
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const sample_t *const *samples, int n_channels, long length);
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void duh_sigrenderer_set_analyser_callback(DUH_SIGRENDERER *sigrenderer,
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DUH_SIGRENDERER_ANALYSER_CALLBACK callback, void *data);
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int dumb_resampling_quality;
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This variable has changed meaning. It used to hold a value from 0 to 4,
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whose meaning was as follows:
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0 - aliasing
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1,2 - linear interpolation
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3 - quadratic interpolation
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4 - cubic interpolation
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0,1 - always use a straightforward interpolation algorithm
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2,3,4 - when decimating (increasing the pitch), use a linear average
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algorithm designed to reduce frequencies that would otherwise
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reflect off the Nyquist
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Now the variable only holds values from 0 to 2, and these values have
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preprocessor constants associated with them. The somewhat inappropriate
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quadratic interpolation has been removed. The linear average algorithm has
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also been removed, and may or may not come back; there are probably more
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efficient ways of achieving the same effect, which I shall be
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investigating in the future.
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This change will have hardly any noticeable effect on existing programs.
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Levels 2, 3 and 4 used considerably more processor time because of the
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linear average algorithm. Likewise, Level 2 in the new scheme (cubic) uses
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considerably more processor time than Levels 1 and 0, and Levels 3 and 4
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will behave identically to Level 2.
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******************
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*** Conclusion ***
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******************
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"I conclude that... DUMB is the bestest music player in the world because...
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Complete this sentence in fifteen words or fewer... D'OH!"
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The preceding conclusion formerly appeared in dumb.txt, and is deprecated
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because it's lame.
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Ben Davis
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entheh@users.sf.net
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IRC EFnet #dumb
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See readme.txt for details on using IRC.
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