Mercurial > SDL_sound_CoreAudio
annotate COPYING @ 474:c66080364dff
Most decoders now report total sample play time, now. Technically, this
breaks binary compatibility with the 1.0 branch, since it extends the
Sound_Sample struct, but most (all?) programs are just passing pointers
allocated by SDL_sound around, and might be okay.
Source-level compatibility is not broken...yet! :)
--ryan.
-------- Original Message --------
Subject: SDL_sound patch: Finding total length of time of sound file.
Date: Sun, 26 Jan 2003 09:31:17 -0800 (PST)
Hi Ryan,
I am working with Eric Wing and helping him modify
SDL_sound. AS part of our efforts in improving and
enhancing SDL_sound, we like to submit this patch. We
modified the codecs to find the total time of a sound
file. Below is the explanation of the patch. The
patch is appended as an attachment to this email.
* MOTIVATION:
We needed the ability to get the total play time of a
sample (And we noticed that we're not the only ones).
Since SDL_sound blocks direct access to the specific
decoders, there is no way for a user to know this
information short of decoding the whole thing.
Because of this, we believe this will be a useful
addition, even though the accuracy may not be perfect
(subject to each decoder) or the information may not
always be available.
* CONTRIBUTORS:
Wesley Leong (modified the majority of the codecs and
verified the results)
Eric Wing (showed everyone how to do modify codec,
modified mikmod)
Wang Lam (modified a handful of codecs, researched
into specs and int overflow)
Ahilan Anantha (modified a few codecs and helped with
integer math)
* GENERAL ISSUES:
We chose the value to be milliseconds as an Sint32.
Milliseconds because that's what Sound_Seek takes as a
parameter and -1 to allow for instances/codecs where
the value could not be determined. We are
not sure if this is the final convention you want, so
we are willing to work with you on this.
We also expect the total_time field to be set on open
and never again modified by SDL_sound. Users may
access it directly much like the sample buffer and
buffer_size. We thought about recomputing the time
on DecodeAll, but since users may seek or decode small
chunks first, not all the data may be there. So this
is better done by the user. This may be good
information to document.
Currently, all the main codecs are implemented except
for QuickTime.
| author | Ryan C. Gordon <icculus@icculus.org> |
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| date | Sat, 08 May 2004 08:19:50 +0000 |
| parents | f369e345ae1e |
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1 Please note that the included source from Timidity, the MIDI decoder, is also |
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2 licensed under the following terms (GNU LGPL), but can also be used |
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3 separately under the GNU GPL, or the Perl Artistic License. Those licensing |
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4 terms are not reprinted here, but can be found on the web easily. |
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5 |
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6 Other external libraries (such as Ogg Vorbis, SMPEG, etc) have their own |
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7 licenses which you should be aware of before including the related code |
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8 in your configuration. Most (if not all) are also under the LGPL, but are |
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9 external projects and we've got no control over them. |
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10 |
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11 If you want to use SDL_sound under a closed-source license, please contact |
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12 Ryan (icculus@clutteredmind.org), and we can discuss an alternate license for |
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13 money to be distributed between the contributors to this work, but I'd |
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14 encourage you to abide by the LGPL, since the usual concern is whether you |
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15 can use this library without releasing your own source code (you can). |
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16 |
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17 |
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18 ------------------- |
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19 |
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20 |
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| 395 infringement or for any other reason (not limited to patent issues), | |
| 396 conditions are imposed on you (whether by court order, agreement or | |
| 397 otherwise) that contradict the conditions of this License, they do not | |
| 398 excuse you from the conditions of this License. If you cannot | |
| 399 distribute so as to satisfy simultaneously your obligations under this | |
| 400 License and any other pertinent obligations, then as a consequence you | |
| 401 may not distribute the Library at all. For example, if a patent | |
| 402 license would not permit royalty-free redistribution of the Library by | |
| 403 all those who receive copies directly or indirectly through you, then | |
| 404 the only way you could satisfy both it and this License would be to | |
| 405 refrain entirely from distribution of the Library. | |
| 406 | |
| 407 If any portion of this section is held invalid or unenforceable under any | |
| 408 particular circumstance, the balance of the section is intended to apply, | |
| 409 and the section as a whole is intended to apply in other circumstances. | |
| 410 | |
| 411 It is not the purpose of this section to induce you to infringe any | |
| 412 patents or other property right claims or to contest validity of any | |
| 413 such claims; this section has the sole purpose of protecting the | |
| 414 integrity of the free software distribution system which is | |
| 415 implemented by public license practices. Many people have made | |
| 416 generous contributions to the wide range of software distributed | |
| 417 through that system in reliance on consistent application of that | |
| 418 system; it is up to the author/donor to decide if he or she is willing | |
| 419 to distribute software through any other system and a licensee cannot | |
| 420 impose that choice. | |
| 421 | |
| 422 This section is intended to make thoroughly clear what is believed to | |
| 423 be a consequence of the rest of this License. | |
| 424 | |
| 425 12. If the distribution and/or use of the Library is restricted in | |
| 426 certain countries either by patents or by copyrighted interfaces, the | |
| 427 original copyright holder who places the Library under this License may add | |
| 428 an explicit geographical distribution limitation excluding those countries, | |
| 429 so that distribution is permitted only in or among countries not thus | |
| 430 excluded. In such case, this License incorporates the limitation as if | |
| 431 written in the body of this License. | |
| 432 | |
| 433 13. The Free Software Foundation may publish revised and/or new | |
| 434 versions of the Lesser General Public License from time to time. | |
| 435 Such new versions will be similar in spirit to the present version, | |
| 436 but may differ in detail to address new problems or concerns. | |
| 437 | |
| 438 Each version is given a distinguishing version number. If the Library | |
| 439 specifies a version number of this License which applies to it and | |
| 440 "any later version", you have the option of following the terms and | |
| 441 conditions either of that version or of any later version published by | |
| 442 the Free Software Foundation. If the Library does not specify a | |
| 443 license version number, you may choose any version ever published by | |
| 444 the Free Software Foundation. | |
| 445 | |
| 446 14. If you wish to incorporate parts of the Library into other free | |
| 447 programs whose distribution conditions are incompatible with these, | |
| 448 write to the author to ask for permission. For software which is | |
| 449 copyrighted by the Free Software Foundation, write to the Free | |
| 450 Software Foundation; we sometimes make exceptions for this. Our | |
| 451 decision will be guided by the two goals of preserving the free status | |
| 452 of all derivatives of our free software and of promoting the sharing | |
| 453 and reuse of software generally. | |
| 454 | |
| 455 NO WARRANTY | |
| 456 | |
| 457 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO | |
| 458 WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. | |
| 459 EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR | |
| 460 OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY | |
| 461 KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE | |
| 462 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 463 PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE | |
| 464 LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME | |
| 465 THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. | |
| 466 | |
| 467 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN | |
| 468 WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY | |
| 469 AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU | |
| 470 FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR | |
| 471 CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE | |
| 472 LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING | |
| 473 RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A | |
| 474 FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF | |
| 475 SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH | |
| 476 DAMAGES. | |
| 477 | |
| 478 END OF TERMS AND CONDITIONS | |
| 479 | |
| 480 How to Apply These Terms to Your New Libraries | |
| 481 | |
| 482 If you develop a new library, and you want it to be of the greatest | |
| 483 possible use to the public, we recommend making it free software that | |
| 484 everyone can redistribute and change. You can do so by permitting | |
| 485 redistribution under these terms (or, alternatively, under the terms of the | |
| 486 ordinary General Public License). | |
| 487 | |
| 488 To apply these terms, attach the following notices to the library. It is | |
| 489 safest to attach them to the start of each source file to most effectively | |
| 490 convey the exclusion of warranty; and each file should have at least the | |
| 491 "copyright" line and a pointer to where the full notice is found. | |
| 492 | |
| 493 <one line to give the library's name and a brief idea of what it does.> | |
| 494 Copyright (C) <year> <name of author> | |
| 495 | |
| 496 This library is free software; you can redistribute it and/or | |
| 497 modify it under the terms of the GNU Lesser General Public | |
| 498 License as published by the Free Software Foundation; either | |
| 499 version 2.1 of the License, or (at your option) any later version. | |
| 500 | |
| 501 This library is distributed in the hope that it will be useful, | |
| 502 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 503 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 504 Lesser General Public License for more details. | |
| 505 | |
| 506 You should have received a copy of the GNU Lesser General Public | |
| 507 License along with this library; if not, write to the Free Software | |
| 508 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 509 | |
| 510 Also add information on how to contact you by electronic and paper mail. | |
| 511 | |
| 512 You should also get your employer (if you work as a programmer) or your | |
| 513 school, if any, to sign a "copyright disclaimer" for the library, if | |
| 514 necessary. Here is a sample; alter the names: | |
| 515 | |
| 516 Yoyodyne, Inc., hereby disclaims all copyright interest in the | |
| 517 library `Frob' (a library for tweaking knobs) written by James Random Hacker. | |
| 518 | |
| 519 <signature of Ty Coon>, 1 April 1990 | |
| 520 Ty Coon, President of Vice | |
| 521 | |
| 522 That's all there is to it! | |
| 523 | |
| 524 |