| 0,0 → 1,395 |
|---|
| /* |
| format:routines to deal with audio (output) format |
| |
| copyright 2008-9 by the mpg123 project - free software under the terms of the LGPL 2.1 |
| see COPYING and AUTHORS files in distribution or http://mpg123.org |
| initially written by Thomas Orgis, starting with parts of the old audio.c, with only faintly manage to show now |
| */ |
| |
| #include "mpg123lib_intern.h" |
| #include "debug.h" |
| |
| /* static int chans[NUM_CHANNELS] = { 1 , 2 }; */ |
| static const long my_rates[MPG123_RATES] = /* only the standard rates */ |
| { |
| 8000, 11025, 12000, |
| 16000, 22050, 24000, |
| 32000, 44100, 48000, |
| }; |
| |
| static const int my_encodings[MPG123_ENCODINGS] = |
| { |
| MPG123_ENC_SIGNED_16, |
| MPG123_ENC_UNSIGNED_16, |
| MPG123_ENC_SIGNED_32, |
| MPG123_ENC_UNSIGNED_32, |
| MPG123_ENC_FLOAT_32, |
| MPG123_ENC_FLOAT_64, |
| MPG123_ENC_SIGNED_8, |
| MPG123_ENC_UNSIGNED_8, |
| MPG123_ENC_ULAW_8, |
| MPG123_ENC_ALAW_8 |
| }; |
| |
| /* Only one type of float is supported. */ |
| # ifdef REAL_IS_FLOAT |
| # define MPG123_FLOAT_ENC MPG123_ENC_FLOAT_32 |
| # else |
| # define MPG123_FLOAT_ENC MPG123_ENC_FLOAT_64 |
| # endif |
| |
| /* The list of actually possible encodings. */ |
| static const int good_encodings[] = |
| { |
| #ifndef NO_16BIT |
| MPG123_ENC_SIGNED_16, |
| MPG123_ENC_UNSIGNED_16, |
| #endif |
| #ifndef NO_32BIT |
| MPG123_ENC_SIGNED_32, |
| MPG123_ENC_UNSIGNED_32, |
| #endif |
| #ifndef NO_REAL |
| MPG123_FLOAT_ENC, |
| #endif |
| #ifndef NO_8BIT |
| MPG123_ENC_SIGNED_8, |
| MPG123_ENC_UNSIGNED_8, |
| MPG123_ENC_ULAW_8, |
| MPG123_ENC_ALAW_8 |
| #endif |
| }; |
| |
| /* Check if encoding is a valid one in this build. |
| ...lazy programming: linear search. */ |
| static int good_enc(const int enc) |
| { |
| size_t i; |
| for(i=0; i<sizeof(good_encodings)/sizeof(int); ++i) |
| if(enc == good_encodings[i]) return TRUE; |
| |
| return FALSE; |
| } |
| |
| void attribute_align_arg mpg123_rates(const long **list, size_t *number) |
| { |
| if(list != NULL) *list = my_rates; |
| if(number != NULL) *number = sizeof(my_rates)/sizeof(long); |
| } |
| |
| /* Now that's a bit tricky... One build of the library knows only a subset of the encodings. */ |
| void attribute_align_arg mpg123_encodings(const int **list, size_t *number) |
| { |
| if(list != NULL) *list = good_encodings; |
| if(number != NULL) *number = sizeof(good_encodings)/sizeof(int); |
| } |
| |
| /* char audio_caps[NUM_CHANNELS][MPG123_RATES+1][MPG123_ENCODINGS]; */ |
| |
| static int rate2num(mpg123_pars *mp, long r) |
| { |
| int i; |
| for(i=0;i<MPG123_RATES;i++) if(my_rates[i] == r) return i; |
| #ifndef NO_NTOM |
| if(mp && mp->force_rate != 0 && mp->force_rate == r) return MPG123_RATES; |
| #endif |
| |
| return -1; |
| } |
| |
| static int enc2num(int encoding) |
| { |
| int i; |
| for(i=0;i<MPG123_ENCODINGS;++i) |
| if(my_encodings[i] == encoding) return i; |
| |
| return -1; |
| } |
| |
| static int cap_fit(mpg123_handle *fr, struct audioformat *nf, int f0, int f2) |
| { |
| int i; |
| int c = nf->channels-1; |
| int rn = rate2num(&fr->p, nf->rate); |
| if(rn >= 0) for(i=f0;i<f2;i++) |
| { |
| if(fr->p.audio_caps[c][rn][i]) |
| { |
| nf->encoding = my_encodings[i]; |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| static int freq_fit(mpg123_handle *fr, struct audioformat *nf, int f0, int f2) |
| { |
| nf->rate = frame_freq(fr)>>fr->p.down_sample; |
| if(cap_fit(fr,nf,f0,f2)) return 1; |
| nf->rate>>=1; |
| if(cap_fit(fr,nf,f0,f2)) return 1; |
| nf->rate>>=1; |
| if(cap_fit(fr,nf,f0,f2)) return 1; |
| #ifndef NO_NTOM |
| /* If nothing worked, try the other rates, only without constrains from user. |
| In case you didn't guess: We enable flexible resampling if we find a working rate. */ |
| if(!fr->p.force_rate && fr->p.down_sample == 0) |
| { |
| int i; |
| int c = nf->channels-1; |
| int rn = rate2num(&fr->p, frame_freq(fr)); |
| int rrn; |
| if(rn < 0) return 0; |
| /* Try higher rates first. */ |
| for(i=f0;i<f2;i++) for(rrn=rn+1; rrn<MPG123_RATES; ++rrn) |
| if(fr->p.audio_caps[c][rrn][i]) |
| { |
| nf->rate = my_rates[rrn]; |
| nf->encoding = my_encodings[i]; |
| return 1; |
| } |
| /* Then lower rates. */ |
| for(i=f0;i<f2;i++) for(rrn=rn-1; rrn>=0; --rrn) |
| if(fr->p.audio_caps[c][rrn][i]) |
| { |
| nf->rate = my_rates[rrn]; |
| nf->encoding = my_encodings[i]; |
| return 1; |
| } |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| /* match constraints against supported audio formats, store possible setup in frame |
| return: -1: error; 0: no format change; 1: format change */ |
| int frame_output_format(mpg123_handle *fr) |
| { |
| struct audioformat nf; |
| int f0=0; |
| int f2=MPG123_ENCODINGS; /* Omit the 32bit and float encodings. */ |
| mpg123_pars *p = &fr->p; |
| /* initialize new format, encoding comes later */ |
| nf.channels = fr->stereo; |
| |
| /* All this forcing should be removed in favour of the capabilities table... */ |
| if(p->flags & MPG123_FORCE_8BIT) |
| { |
| f0 = 6; |
| f2 = 10; |
| } |
| if(p->flags & MPG123_FORCE_FLOAT) |
| { |
| f0 = 4; |
| f2 = 6; |
| } |
| |
| /* force stereo is stronger */ |
| if(p->flags & MPG123_FORCE_MONO) nf.channels = 1; |
| if(p->flags & MPG123_FORCE_STEREO) nf.channels = 2; |
| |
| #ifndef NO_NTOM |
| if(p->force_rate) |
| { |
| nf.rate = p->force_rate; |
| if(cap_fit(fr,&nf,f0,2)) goto end; /* 16bit encodings */ |
| if(cap_fit(fr,&nf,f0<=2 ? 2 : f0,f2)) goto end; /* 8bit encodings */ |
| |
| /* try again with different stereoness */ |
| if(nf.channels == 2 && !(p->flags & MPG123_FORCE_STEREO)) nf.channels = 1; |
| else if(nf.channels == 1 && !(p->flags & MPG123_FORCE_MONO)) nf.channels = 2; |
| |
| if(cap_fit(fr,&nf,f0,2)) goto end; /* 16bit encodings */ |
| if(cap_fit(fr,&nf,f0<=2 ? 2 : f0,f2)) goto end; /* 8bit encodings */ |
| |
| if(NOQUIET) |
| error3( "Unable to set up output format! Constraints: %s%s%liHz.", |
| ( p->flags & MPG123_FORCE_STEREO ? "stereo, " : |
| (p->flags & MPG123_FORCE_MONO ? "mono, " : "") ), |
| (p->flags & MPG123_FORCE_8BIT ? "8bit, " : ""), |
| p->force_rate ); |
| /* if(NOQUIET && p->verbose <= 1) print_capabilities(fr); */ |
| |
| fr->err = MPG123_BAD_OUTFORMAT; |
| return -1; |
| } |
| #endif |
| |
| if(freq_fit(fr, &nf, f0, 2)) goto end; /* try rates with 16bit */ |
| if(freq_fit(fr, &nf, f0<=2 ? 2 : f0, f2)) goto end; /* ... 8bit */ |
| |
| /* try again with different stereoness */ |
| if(nf.channels == 2 && !(p->flags & MPG123_FORCE_STEREO)) nf.channels = 1; |
| else if(nf.channels == 1 && !(p->flags & MPG123_FORCE_MONO)) nf.channels = 2; |
| |
| if(freq_fit(fr, &nf, f0, 2)) goto end; /* try rates with 16bit */ |
| if(freq_fit(fr, &nf, f0<=2 ? 2 : f0, f2)) goto end; /* ... 8bit */ |
| |
| /* Here is the _bad_ end. */ |
| if(NOQUIET) |
| { |
| error5( "Unable to set up output format! Constraints: %s%s%li, %li or %liHz.", |
| ( p->flags & MPG123_FORCE_STEREO ? "stereo, " : |
| (p->flags & MPG123_FORCE_MONO ? "mono, " : "") ), |
| (p->flags & MPG123_FORCE_8BIT ? "8bit, " : ""), |
| frame_freq(fr), frame_freq(fr)>>1, frame_freq(fr)>>2 ); |
| } |
| /* if(NOQUIET && p->verbose <= 1) print_capabilities(fr); */ |
| |
| fr->err = MPG123_BAD_OUTFORMAT; |
| return -1; |
| |
| end: /* Here is the _good_ end. */ |
| /* we had a successful match, now see if there's a change */ |
| if(nf.rate == fr->af.rate && nf.channels == fr->af.channels && nf.encoding == fr->af.encoding) |
| { |
| debug2("Old format with %i channels, and FORCE_MONO=%li", nf.channels, p->flags & MPG123_FORCE_MONO); |
| return 0; /* the same format as before */ |
| } |
| else /* a new format */ |
| { |
| debug1("New format with %i channels!", nf.channels); |
| fr->af.rate = nf.rate; |
| fr->af.channels = nf.channels; |
| fr->af.encoding = nf.encoding; |
| /* Cache the size of one sample in bytes, for ease of use. */ |
| if(fr->af.encoding & MPG123_ENC_8) |
| fr->af.encsize = 1; |
| else if(fr->af.encoding & MPG123_ENC_16) |
| fr->af.encsize = 2; |
| else if(fr->af.encoding & MPG123_ENC_32 || fr->af.encoding == MPG123_ENC_FLOAT_32) |
| fr->af.encsize = 4; |
| else if(fr->af.encoding == MPG123_ENC_FLOAT_64) |
| fr->af.encsize = 8; |
| else |
| { |
| if(NOQUIET) error1("Some unknown encoding??? (%i)", fr->af.encoding); |
| |
| fr->err = MPG123_BAD_OUTFORMAT; |
| return -1; |
| } |
| return 1; |
| } |
| } |
| |
| int attribute_align_arg mpg123_format_none(mpg123_handle *mh) |
| { |
| int r; |
| if(mh == NULL) return MPG123_ERR; |
| |
| r = mpg123_fmt_none(&mh->p); |
| if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; } |
| |
| return r; |
| } |
| |
| int attribute_align_arg mpg123_fmt_none(mpg123_pars *mp) |
| { |
| if(mp == NULL) return MPG123_BAD_PARS; |
| |
| if(PVERB(mp,3)) fprintf(stderr, "Note: Disabling all formats.\n"); |
| |
| memset(mp->audio_caps,0,sizeof(mp->audio_caps)); |
| return MPG123_OK; |
| } |
| |
| int attribute_align_arg mpg123_format_all(mpg123_handle *mh) |
| { |
| int r; |
| if(mh == NULL) return MPG123_ERR; |
| |
| r = mpg123_fmt_all(&mh->p); |
| if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; } |
| |
| return r; |
| } |
| |
| int attribute_align_arg mpg123_fmt_all(mpg123_pars *mp) |
| { |
| size_t rate, ch, enc; |
| if(mp == NULL) return MPG123_BAD_PARS; |
| |
| if(PVERB(mp,3)) fprintf(stderr, "Note: Enabling all formats.\n"); |
| |
| for(ch=0; ch < NUM_CHANNELS; ++ch) |
| for(rate=0; rate < MPG123_RATES+1; ++rate) |
| for(enc=0; enc < MPG123_ENCODINGS; ++enc) |
| mp->audio_caps[ch][rate][enc] = good_enc(my_encodings[enc]) ? 1 : 0; |
| |
| return MPG123_OK; |
| } |
| |
| int attribute_align_arg mpg123_format(mpg123_handle *mh, long rate, int channels, int encodings) |
| { |
| int r; |
| if(mh == NULL) return MPG123_ERR; |
| r = mpg123_fmt(&mh->p, rate, channels, encodings); |
| if(r != MPG123_OK){ mh->err = r; r = MPG123_ERR; } |
| |
| return r; |
| } |
| |
| int attribute_align_arg mpg123_fmt(mpg123_pars *mp, long rate, int channels, int encodings) |
| { |
| int ie, ic, ratei; |
| int ch[2] = {0, 1}; |
| if(mp == NULL) return MPG123_BAD_PARS; |
| if(!(channels & (MPG123_MONO|MPG123_STEREO))) return MPG123_BAD_CHANNEL; |
| |
| if(PVERB(mp,3)) fprintf(stderr, "Note: Want to enable format %li/%i for encodings 0x%x.\n", rate, channels, encodings); |
| |
| if(!(channels & MPG123_STEREO)) ch[1] = 0; /* {0,0} */ |
| else if(!(channels & MPG123_MONO)) ch[0] = 1; /* {1,1} */ |
| ratei = rate2num(mp, rate); |
| if(ratei < 0) return MPG123_BAD_RATE; |
| |
| /* now match the encodings */ |
| for(ic = 0; ic < 2; ++ic) |
| { |
| for(ie = 0; ie < MPG123_ENCODINGS; ++ie) |
| if(good_enc(my_encodings[ie]) && ((my_encodings[ie] & encodings) == my_encodings[ie])) |
| mp->audio_caps[ch[ic]][ratei][ie] = 1; |
| |
| if(ch[0] == ch[1]) break; /* no need to do it again */ |
| } |
| |
| return MPG123_OK; |
| } |
| |
| int attribute_align_arg mpg123_format_support(mpg123_handle *mh, long rate, int encoding) |
| { |
| if(mh == NULL) return 0; |
| else return mpg123_fmt_support(&mh->p, rate, encoding); |
| } |
| |
| int attribute_align_arg mpg123_fmt_support(mpg123_pars *mp, long rate, int encoding) |
| { |
| int ch = 0; |
| int ratei, enci; |
| ratei = rate2num(mp, rate); |
| enci = enc2num(encoding); |
| if(mp == NULL || ratei < 0 || enci < 0) return 0; |
| if(mp->audio_caps[0][ratei][enci]) ch |= MPG123_MONO; |
| if(mp->audio_caps[1][ratei][enci]) ch |= MPG123_STEREO; |
| return ch; |
| } |
| |
| /* Call this one to ensure that any valid format will be something different than this. */ |
| void invalidate_format(struct audioformat *af) |
| { |
| af->encoding = 0; |
| af->rate = 0; |
| af->channels = 0; |
| } |
| |
| /* take into account: channels, bytes per sample -- NOT resampling!*/ |
| off_t samples_to_bytes(mpg123_handle *fr , off_t s) |
| { |
| return s * fr->af.encsize * fr->af.channels; |
| } |
| |
| off_t bytes_to_samples(mpg123_handle *fr , off_t b) |
| { |
| return b / fr->af.encsize / fr->af.channels; |
| } |