diff options
Diffstat (limited to 'src/libmad/layer12.c')
| -rw-r--r-- | src/libmad/layer12.c | 50 |
1 files changed, 37 insertions, 13 deletions
diff --git a/src/libmad/layer12.c b/src/libmad/layer12.c index d14122a85..6981f9ce1 100644 --- a/src/libmad/layer12.c +++ b/src/libmad/layer12.c @@ -1,6 +1,6 @@ /* * libmad - MPEG audio decoder library - * Copyright (C) 2000-2003 Underbit Technologies, Inc. + * 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 @@ -16,7 +16,7 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * - * $Id: layer12.c,v 1.1 2003/08/14 03:57:13 shank Exp $ + * $Id: layer12.c,v 1.17 2004/02/05 09:02:39 rob Exp $ */ # ifdef HAVE_CONFIG_H @@ -341,20 +341,44 @@ int mad_layer_II(struct mad_stream *stream, struct mad_frame *frame) if (header->flags & MAD_FLAG_LSF_EXT) index = 4; + else if (header->flags & MAD_FLAG_FREEFORMAT) + goto freeformat; else { - switch (nch == 2 ? header->bitrate / 2 : header->bitrate) { - case 32000: - case 48000: - index = (header->samplerate == 32000) ? 3 : 2; - break; + unsigned long bitrate_per_channel; - case 56000: - case 64000: - case 80000: - index = 0; - break; + bitrate_per_channel = header->bitrate; + if (nch == 2) { + bitrate_per_channel /= 2; - default: +# if defined(OPT_STRICT) + /* + * ISO/IEC 11172-3 allows only single channel mode for 32, 48, 56, and + * 80 kbps bitrates in Layer II, but some encoders ignore this + * restriction. We enforce it if OPT_STRICT is defined. + */ + if (bitrate_per_channel <= 28000 || bitrate_per_channel == 40000) { + stream->error = MAD_ERROR_BADMODE; + return -1; + } +# endif + } + else { /* nch == 1 */ + if (bitrate_per_channel > 192000) { + /* + * ISO/IEC 11172-3 does not allow single channel mode for 224, 256, + * 320, or 384 kbps bitrates in Layer II. + */ + stream->error = MAD_ERROR_BADMODE; + return -1; + } + } + + if (bitrate_per_channel <= 48000) + index = (header->samplerate == 32000) ? 3 : 2; + else if (bitrate_per_channel <= 80000) + index = 0; + else { + freeformat: index = (header->samplerate == 48000) ? 0 : 1; } } |