| Alexandre Lision | 7c6f4a6 | 2013-09-05 13:27:01 -0400 | [diff] [blame^] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> |
| 2 | <HTML> |
| 3 | |
| 4 | <HEAD> |
| 5 | <TITLE> |
| 6 | libsndfile : Embedded Sound Files. |
| 7 | </TITLE> |
| 8 | <META NAME="Author" CONTENT="Erik de Castro Lopo (erikd AT mega-nerd DOT com)"> |
| 9 | <META NAME="Description" CONTENT="The libsndfile API."> |
| 10 | <META NAME="Keywords" CONTENT="WAV AIFF AU libsndfile sound audio dsp Linux"> |
| 11 | <LINK REL="stylesheet" HREF="libsndfile.css" TYPE="text/css" MEDIA="all"> |
| 12 | <LINK REL="stylesheet" HREF="print.css" TYPE="text/css" MEDIA="print"> |
| 13 | </HEAD> |
| 14 | <!-- pepper --> |
| 15 | <BODY> |
| 16 | <!-- pepper --> |
| 17 | <H1><B>Embedded Sound Files.</B></H1> |
| 18 | |
| 19 | <P> |
| 20 | By using the open SNDFILE with a file descriptor function: |
| 21 | </P> |
| 22 | <!-- pepper --> |
| 23 | <PRE> |
| 24 | SNDFILE* sf_open_fd (int fd, int mode, SF_INFO *sfinfo, int close_desc) ; |
| 25 | </PRE> |
| 26 | <!-- pepper --> |
| 27 | <P> |
| 28 | it is possible to open sound files embedded within larger files. |
| 29 | There are however a couple of caveats: |
| 30 | <P> |
| 31 | <!-- pepper --> |
| 32 | <UL> |
| 33 | <LI> Read/Write mode (SFM_RDWR) is not supported. |
| 34 | <LI> Writing of embedded files is only supported at the end of the file. |
| 35 | <LI> Reading of embedded files is only supported at file offsets greater |
| 36 | than zero. |
| 37 | <LI> Not all file formats are supported (currently only WAV, AIFF and AU). |
| 38 | </UL> |
| 39 | <!-- pepper --> |
| 40 | <P> |
| 41 | The test program <B>multi_file_test.c</B> in the <B>tests/</B> directory of the |
| 42 | source code tarball shows how this functionality is used to read and write |
| 43 | embedded files. |
| 44 | </P> |
| 45 | <!-- pepper --> |
| 46 | </BODY> |
| 47 | </HTML> |