From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001 From: Sean Bartell Date: Sat, 25 Jun 2011 21:32:25 -0400 Subject: Add codecs to librbcodec. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius Tested-by: Nils Wallménius --- lib/rbcodec/codecs/libmad/frame.h | 124 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 124 insertions(+) create mode 100644 lib/rbcodec/codecs/libmad/frame.h (limited to 'lib/rbcodec/codecs/libmad/frame.h') diff --git a/lib/rbcodec/codecs/libmad/frame.h b/lib/rbcodec/codecs/libmad/frame.h new file mode 100644 index 0000000000..b1c6e0289d --- /dev/null +++ b/lib/rbcodec/codecs/libmad/frame.h @@ -0,0 +1,124 @@ +/* + * libmad - MPEG audio decoder library + * Copyright (C) 2000-2004 Underbit Technologies, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * $Id$ + */ + +# ifndef LIBMAD_FRAME_H +# define LIBMAD_FRAME_H + +# include "fixed.h" +# include "timer.h" +# include "stream.h" + +enum mad_layer { + MAD_LAYER_I = 1, /* Layer I */ + MAD_LAYER_II = 2, /* Layer II */ + MAD_LAYER_III = 3 /* Layer III */ +}; + +enum mad_mode { + MAD_MODE_SINGLE_CHANNEL = 0, /* single channel */ + MAD_MODE_DUAL_CHANNEL = 1, /* dual channel */ + MAD_MODE_JOINT_STEREO = 2, /* joint (MS/intensity) stereo */ + MAD_MODE_STEREO = 3 /* normal LR stereo */ +}; + +enum mad_emphasis { + MAD_EMPHASIS_NONE = 0, /* no emphasis */ + MAD_EMPHASIS_50_15_US = 1, /* 50/15 microseconds emphasis */ + MAD_EMPHASIS_CCITT_J_17 = 3, /* CCITT J.17 emphasis */ + MAD_EMPHASIS_RESERVED = 2 /* unknown emphasis */ +}; + +struct mad_header { + enum mad_layer layer; /* audio layer (1, 2, or 3) */ + enum mad_mode mode; /* channel mode (see above) */ + int mode_extension; /* additional mode info */ + enum mad_emphasis emphasis; /* de-emphasis to use (see above) */ + + unsigned long bitrate; /* stream bitrate (bps) */ + unsigned int samplerate; /* sampling frequency (Hz) */ + + unsigned short crc_check; /* frame CRC accumulator */ + unsigned short crc_target; /* final target CRC checksum */ + + int flags; /* flags (see below) */ + int private_bits; /* private bits (see below) */ + +#if 0 /* rockbox: not used */ + mad_timer_t duration; /* audio playing time of frame */ +#endif +}; + +struct mad_frame { + struct mad_header header; /* MPEG audio header */ + int options; /* decoding options (from stream) */ + + mad_fixed_t (*sbsample)[2][36][32] MEM_ALIGN_ATTR; /* synthesis subband filter samples */ + mad_fixed_t (*sbsample_prev)[2][36][32] MEM_ALIGN_ATTR; /* synthesis subband filter samples + from previous frame only needed + when synthesis is on cop */ + + mad_fixed_t (*overlap)[2][32][18] MEM_ALIGN_ATTR; /* Layer III block overlap data */ +}; + +# define MAD_NCHANNELS(header) ((header)->mode ? 2 : 1) +# define MAD_NSBSAMPLES(header) \ + ((header)->layer == MAD_LAYER_I ? 12 : \ + (((header)->layer == MAD_LAYER_III && \ + ((header)->flags & MAD_FLAG_LSF_EXT)) ? 18 : 36)) + +enum { + MAD_FLAG_NPRIVATE_III = 0x0007, /* number of Layer III private bits */ + MAD_FLAG_INCOMPLETE = 0x0008, /* header but not data is decoded */ + + MAD_FLAG_PROTECTION = 0x0010, /* frame has CRC protection */ + MAD_FLAG_COPYRIGHT = 0x0020, /* frame is copyright */ + MAD_FLAG_ORIGINAL = 0x0040, /* frame is original (else copy) */ + MAD_FLAG_PADDING = 0x0080, /* frame has additional slot */ + + MAD_FLAG_I_STEREO = 0x0100, /* uses intensity joint stereo */ + MAD_FLAG_MS_STEREO = 0x0200, /* uses middle/side joint stereo */ + MAD_FLAG_FREEFORMAT = 0x0400, /* uses free format bitrate */ + + MAD_FLAG_LSF_EXT = 0x1000, /* lower sampling freq. extension */ + MAD_FLAG_MC_EXT = 0x2000, /* multichannel audio extension */ + MAD_FLAG_MPEG_2_5_EXT = 0x4000 /* MPEG 2.5 (unofficial) extension */ +}; + +enum { + MAD_PRIVATE_HEADER = 0x0100, /* header private bit */ + MAD_PRIVATE_III = 0x001f /* Layer III private bits (up to 5) */ +}; + +void mad_header_init(struct mad_header *); + +# define mad_header_finish(header) /* nothing */ + +int mad_header_decode(struct mad_header *, struct mad_stream *); + +void mad_frame_init(struct mad_frame *); +/* rockbox: not used +void mad_frame_finish(struct mad_frame *);*/ + +int mad_frame_decode(struct mad_frame *, struct mad_stream *); + +void mad_frame_mute(struct mad_frame *); + +# endif -- cgit v1.2.3