diff options
| -rw-r--r-- | libavcodec/amr.c | 79 |
1 files changed, 45 insertions, 34 deletions
diff --git a/libavcodec/amr.c b/libavcodec/amr.c index ed4fdcec64..3c089aaf0f 100644 --- a/libavcodec/amr.c +++ b/libavcodec/amr.c @@ -18,41 +18,52 @@ * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ - /* - This code implements amr-nb and amr-wb audio encoder/decoder through external reference - code from www.3gpp.org. The license of the code from 3gpp is unclear so you - have to download the code separately. Two versions exists: One fixed-point - and one with floats. For some reason the float-encoder is significant faster - at least on a P4 1.5GHz (0.9s instead of 9.9s on a 30s audio clip at MR102). - Both float and fixed point are supported for amr-nb, but only float for - amr-wb. - - --AMR-NB-- - The fixed-point (TS26.073) can be downloaded from: - http://www.3gpp.org/ftp/Specs/archive/26_series/26.073/26073-510.zip - Extract the source into ffmpeg/libavcodec/amr - To use the fixed version run "./configure" with "--enable-amr_nb-fixed" - - The float version (default) can be downloaded from: - http://www.3gpp.org/ftp/Specs/archive/26_series/26.104/26104-510.zip - Extract the source into ffmpeg/libavcodec/amr_float - - The specification for amr-nb can be found in TS 26.071 - (http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other - info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm - - --AMR-WB-- - The reference code can be downloaded from: - http://www.3gpp.org/ftp/Specs/archive/26_series/26.204/26204-510.zip - It should be extracted to "libavcodec/amrwb_float". Enable it with - "--enable-amr_wb". - - The specification for amr-wb can be downloaded from: - http://www.3gpp.org/ftp/Specs/archive/26_series/26.171/26171-500.zip - - If someone wants to use the fixed point version it can be downloaded - from: http://www.3gpp.org/ftp/Specs/archive/26_series/26.173/26173-571.zip + /** @file + * Adaptive Multi-Rate (AMR) Audio decoder stub. + * + * This code implements both an AMR-NarrowBand (AMR-NB) and an AMR-WideBand + * (AMR-WB) audio encoder/decoder through external reference code from + * http://www.3gpp.org/. The license of the code from 3gpp is unclear so you + * have to download the code separately. Two versions exists: One fixed-point + * and one with floats. For some reason the float-encoder is significant faster + * at least on a P4 1.5GHz (0.9s instead of 9.9s on a 30s audio clip at MR102). + * Both float and fixed point are supported for AMR-NB, but only float for + * AMR-WB. + * + * \section AMR-NB + * + * \subsection Float + * The float version (default) can be downloaded from: + * http://www.3gpp.org/ftp/Specs/archive/26_series/26.104/26104-510.zip + * Extract the source into \c "ffmpeg/libavcodec/amr_float". + * + * \subsection Fixed-point + * The fixed-point (TS26.073) can be downloaded from: + * http://www.3gpp.org/ftp/Specs/archive/26_series/26.073/26073-510.zip. + * Extract the source into \c "ffmpeg/libavcodec/amr". + * To use the fixed version run \c "./configure" with \c "--enable-amr_nb-fixed". + * + * \subsection Specification + * The specification for AMR-NB can be found in TS 26.071 + * (http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other + * info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm. + * + * \section AMR-WB + * \subsection Float + * The reference code can be downloaded from: + * http://www.3gpp.org/ftp/Specs/archive/26_series/26.204/26204-510.zip + * It should be extracted to \c "ffmpeg/libavcodec/amrwb_float". Enable it with + * \c "--enable-amr_wb". + * + * \subsection Fixed-point + * If someone wants to use the fixed point version it can be downloaded from: + * http://www.3gpp.org/ftp/Specs/archive/26_series/26.173/26173-571.zip. + * + * \subsection Specification + * The specification for AMR-WB can be downloaded from: + * http://www.3gpp.org/ftp/Specs/archive/26_series/26.171/26171-500.zip. + * */ #include "avcodec.h" |