/* * TwoLAME: an optimized MPEG Audio Layer Two encoder * * Copyright (C) 2001-2004 Michael Cheng * Copyright (C) 2004-2006 The TwoLAME Project * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * $Id$ * */ #include #include #include #include #include #include "twolame.h" #include "common.h" #include "util.h" // Return string containg version number // of this library const char *get_twolame_version(void) { const char *str = PACKAGE_VERSION; return str; } // Return string containg version number // of this library const char *get_twolame_url(void) { const char *str = "http://www.twolame.org"; return str; } /* 1: MPEG-1, 0: MPEG-2 LSF, 1995-07-11 shn */ static const int bitrate_table[2][15] = { {0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}, {0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384} }; // // Returns a name string for MPEG version enumeration // const char *twolame_mpeg_version_name(int version) { static const char *version_name[3] = { "MPEG-2 LSF", "MPEG-1", "Illegal Version" }; if (version == 0) return (version_name[0]); if (version == 1) return (version_name[1]); return (version_name[2]); } // Returns the index associated with a bitrate for // the specified version of MPEG. // // Returns -1 for invalid bitrates // int twolame_get_bitrate_index(int bitrate, TWOLAME_MPEG_version version) { int index = 0; int found = 0; // MFC sanity check. if (version != 0 && version != 1) { fprintf(stderr, "twolame_get_bitrate_index: invalid version index %i\n", version); return -1; } while (!found && index < 15) { if (bitrate_table[version][index] == bitrate) found = 1; else ++index; } if (found) return (index); else { fprintf(stderr, "twolame_get_bitrate_index: %d is not a legal bitrate for version '%s'\n", bitrate, twolame_mpeg_version_name(version)); return -1; } } // convert samp frq in Hz to index // legal rates 16000, 22050, 24000, 32000, 44100, 48000 // -1 is returned for invalid samplerates int twolame_get_samplerate_index(long sample_rate) { switch (sample_rate) { case 44100L: return 0; case 48000L: return 1; case 32000L: return 2; case 22050L: return 0; case 24000L: return 1; case 16000L: return 2; } // Invalid choice of samplerate fprintf(stderr, "twolame_get_samplerate_index: %ld is not a legal sample rate\n", sample_rate); return -1; } // Return the MPEG Version to use for the specified samplerate // -1 is returned for invalid samplerates int twolame_get_version_for_samplerate(long sample_rate) { switch (sample_rate) { case 48000L: return TWOLAME_MPEG1; case 44100L: return TWOLAME_MPEG1; case 32000L: return TWOLAME_MPEG1; case 24000L: return TWOLAME_MPEG2; case 22050L: return TWOLAME_MPEG2; case 16000L: return TWOLAME_MPEG2; } // Invalid choice of samplerate fprintf(stderr, "twolame_get_version_for_samplerate: %ld is not a legal sample rate\n", sample_rate); return -1; } // Get the number of bytes per frame, for current settings int twolame_get_framelength(twolame_options * glopts) { int bytes = 144 * (glopts->bitrate * 1000) / glopts->samplerate_out; if (glopts->padding) bytes++; return bytes; } // Print the library version and // encoder parameter settings to STDERR void twolame_print_config(twolame_options * glopts) { FILE *fd = stderr; // Are we being silent ? if (glopts->verbosity <= 0) return; // Are we being brief ? if (glopts->verbosity == 1) { fprintf(fd, "LibTwoLame version %s (%s)\n", get_twolame_version(), get_twolame_url()); fprintf(fd, "Encoding as %dHz, ", twolame_get_out_samplerate(glopts)); fprintf(fd, "%d kbps, ", twolame_get_bitrate(glopts)); if (twolame_get_VBR(glopts)) fprintf(fd, "VBR, "); else fprintf(fd, "CBR, "); fprintf(fd, "%s Layer II\n", twolame_get_version_name(glopts)); } else { fprintf(fd, "---------------------------------------------------------\n"); fprintf(fd, "LibTwoLame %s (%s)\n", get_twolame_version(), get_twolame_url()); fprintf(fd, "Input : %d Hz, %d channels\n", twolame_get_in_samplerate(glopts), twolame_get_num_channels(glopts)); fprintf(fd, "Output: %d Hz, %s\n", twolame_get_out_samplerate(glopts), twolame_get_mode_name(glopts)); fprintf(fd, "%d kbps ", twolame_get_bitrate(glopts)); if (twolame_get_VBR(glopts)) fprintf(fd, "VBR "); else fprintf(fd, "CBR "); fprintf(fd, "%s Layer II ", twolame_get_version_name(glopts)); fprintf(fd, "psycho model=%d \n", twolame_get_psymodel(glopts)); fprintf(fd, "[De-emph:%s Copyright:%s Original:%s]\n", ((twolame_get_emphasis(glopts)) ? "On " : "Off"), ((twolame_get_copyright(glopts)) ? "Yes" : "No "), ((twolame_get_original(glopts)) ? "Yes" : "No ")); fprintf(fd, "[Padding:%s CRC:%s Energy:%s ]\n", ((twolame_get_padding(glopts)) ? "Normal" : "Off "), ((twolame_get_error_protection(glopts)) ? "On " : "Off"), ((twolame_get_energy_levels(glopts)) ? "On " : "Off")); if (glopts->verbosity >= 3) { if (twolame_get_VBR(glopts)) { fprintf(fd, " - VBR Enabled. Using MNR boost of %f\n", twolame_get_VBR_level(glopts)); fprintf(fd, " - VBR bitrate index limits [%i -> %i]\n", glopts->lower_index, glopts->upper_index); } fprintf(fd, " - ATH adjustment %f\n", twolame_get_ATH_level(glopts)); if (twolame_get_num_ancillary_bits(glopts)) fprintf(fd, " - Reserving %i ancillary bits\n", twolame_get_num_ancillary_bits(glopts)); if (twolame_get_scale(glopts) != 1.0f) fprintf(fd, " - Scaling audio by %f\n", twolame_get_scale(glopts)); if (twolame_get_scale_left(glopts) != 1.0f) fprintf(fd, " - Scaling left channel by %f\n", twolame_get_scale_left(glopts)); if (twolame_get_scale_right(glopts) != 1.0f) fprintf(fd, " - Scaling right channel by %f\n", twolame_get_scale_right(glopts)); // if (glopts->num_channels_in == 2 && glopts->num_channels_out == 1 ) { // fprintf(fd, " - Downmixing from stereo to mono.\n"); // } else if (glopts->num_channels_in == 1 && glopts->num_channels_out == 2 ) { // fprintf(fd, " - Upmixing from mono to stereo.\n"); // } } fprintf(fd, "---------------------------------------------------------\n"); } } // vim:ts=4:sw=4:nowrap: