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-rw-r--r--mpg123_artsplugin/mpg123PlayObject_impl.cpp675
1 files changed, 675 insertions, 0 deletions
diff --git a/mpg123_artsplugin/mpg123PlayObject_impl.cpp b/mpg123_artsplugin/mpg123PlayObject_impl.cpp
new file mode 100644
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--- /dev/null
+++ b/mpg123_artsplugin/mpg123PlayObject_impl.cpp
@@ -0,0 +1,675 @@
+/*
+ * $Id$
+ * Copyright (C) 2001 Kevin Puetz
+ *
+ *
+ * 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.
+ *
+ */
+
+#include <config.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/stat.h>
+#include <sys/shm.h>
+#include <sys/wait.h>
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <math.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/////////////////////////////////////////////////////////////
+// aRts interface
+
+#include <stdsynthmodule.h>
+#include "mpg123arts.h"
+#include <convert.h>
+#include <debug.h>
+
+
+#include "mpg123PlayObject_impl.h"
+
+using namespace Arts;
+
+int mpg123PlayObject_impl::decoder_init = 0;
+
+// This is to minimize the hackery in mpg123
+int audio_get_formats(struct audio_info_struct *)
+{
+ return AUDIO_FORMAT_SIGNED_16;
+}
+
+// This is purely convenience
+void mpg123PlayObject_impl::set_synth_functions(struct frame *fr)
+{
+ typedef int (*func)(real *,int,unsigned char *,int *);
+ typedef int (*func_mono)(real *,unsigned char *,int *);
+ typedef void (*func_dct36)(real *,real *,real *,real *,real *);
+
+ int ds = fr->down_sample;
+ int p8=0;
+ // it's as big as pcmdata (internal to mpg123 - where this size comes from I dunno
+ // but it'll be big enough, since all data comes as memcpy's from there.
+
+ static func funcs[][4] = {
+ { synth_1to1,
+ synth_2to1,
+ synth_4to1,
+ synth_ntom } ,
+ { synth_1to1_8bit,
+ synth_2to1_8bit,
+ synth_4to1_8bit,
+ synth_ntom_8bit }
+#ifdef USE_3DNOW
+ ,{synth_1to1_3dnow,
+ synth_2to1,
+ synth_4to1,
+ synth_ntom }
+#endif
+ };
+
+ static func_mono funcs_mono[2][2][4] = {
+ { { synth_1to1_mono2stereo ,
+ synth_2to1_mono2stereo ,
+ synth_4to1_mono2stereo ,
+ synth_ntom_mono2stereo } ,
+ { synth_1to1_8bit_mono2stereo ,
+ synth_2to1_8bit_mono2stereo ,
+ synth_4to1_8bit_mono2stereo ,
+ synth_ntom_8bit_mono2stereo } } ,
+ { { synth_1to1_mono ,
+ synth_2to1_mono ,
+ synth_4to1_mono ,
+ synth_ntom_mono } ,
+ { synth_1to1_8bit_mono ,
+ synth_2to1_8bit_mono ,
+ synth_4to1_8bit_mono ,
+ synth_ntom_8bit_mono } }
+ };
+
+#ifdef USE_3DNOW
+ static func_dct36 funcs_dct36[2] = {dct36 , dct36_3dnow};
+#endif
+
+ if (0) // ((ai.format & AUDIO_FORMAT_MASK) == AUDIO_FORMAT_8)
+ p8 = 1;
+ fr->synth = funcs[p8][ds];
+ fr->synth_mono = funcs_mono[param.force_stereo?0:1][p8][ds];
+
+#ifdef USE_3DNOW
+ arts_debug("set_synth_functions: 3dnow?");
+ /* check cpuflags bit 31 (3DNow!) and 23 (MMX) */
+ if((param.stat_3dnow < 2) &&
+ ((param.stat_3dnow == 1) ||
+ (getcpuflags() & 0x80800000) == 0x80800000))
+ {
+ fr->synth = funcs[2][ds]; /* 3DNow! optimized synth_1to1() */
+ fr->dct36 = funcs_dct36[1]; /* 3DNow! optimized dct36() */
+ } else {
+ fr->dct36 = funcs_dct36[0];
+ }
+#endif
+
+ if (p8)
+ {
+ make_conv16to8_table(-1); // FIX
+ }
+}
+
+void mpg123PlayObject_impl::initialise_decoder()
+{
+ arts_debug("initializing decoder");
+ set_synth_functions(&mp->fr);
+ make_decode_tables(param.outscale);
+ init_layer2(); // inits also shared tables with layer1
+ init_layer3(mp->fr.down_sample); // No down sample support (yet?)
+}
+
+int mpg123PlayObject_impl::play_frame(int init)
+{
+ struct frame *fr = &mp->fr;
+ int clip;
+ long newrate;
+ long old_rate,old_format,old_channels;
+
+ if(fr->header_change || init) {
+
+ if(fr->header_change > 1 || init) {
+ old_rate = ai.rate;
+ old_format = ai.format;
+ old_channels = ai.channels;
+
+ newrate = (long)param.pitch * (freqs[fr->sampling_frequency]>>(param.down_sample));
+ if(param.verbose && param.pitch != 1.0)
+ fprintf(stderr,"Pitching to %f => %ld Hz\n",param.pitch,newrate);
+
+ fr->down_sample = param.down_sample;
+
+ ai.format = AUDIO_FORMAT_SIGNED_16;
+ ai.rate = 44100;
+ ai.channels = 2;
+
+ /* check, whether the fitter setted our proposed rate */
+ if(ai.rate != newrate) {
+ arts_debug("resampling from %d to %d",newrate, ai.rate);
+ if(ai.rate == (newrate>>1) )
+ fr->down_sample++;
+ else if(ai.rate == (newrate>>2) )
+ fr->down_sample+=2;
+ else {
+ fr->down_sample = 3;
+ fprintf(stderr,"Warning, flexible rate not heavily tested!\n");
+ }
+ if(fr->down_sample > 3)
+ fr->down_sample = 3;
+ }
+
+ if(fr->down_sample > 3)
+ fr->down_sample = 3;
+
+ switch(fr->down_sample) {
+ case 0:
+ case 1:
+ case 2:
+ fr->down_sample_sblimit = SBLIMIT>>(fr->down_sample);
+ break;
+ case 3:
+ {
+ long n = (long)param.pitch * freqs[fr->sampling_frequency];
+ long m = ai.rate;
+
+ synth_ntom_set_step(n,m);
+
+ if(n>m) {
+ fr->down_sample_sblimit = SBLIMIT * m;
+ fr->down_sample_sblimit /= n;
+ }
+ else {
+ fr->down_sample_sblimit = SBLIMIT;
+ }
+ }
+ break;
+ }
+
+ set_synth_functions(fr);
+ //init_output(); XXX: eh?
+ if(ai.rate != old_rate || ai.channels != old_channels ||
+ ai.format != old_format || param.force_reopen) {
+ if(param.force_mono < 0) {
+ if(ai.channels == 1)
+ fr->single = 3;
+ else
+ fr->single = -1;
+ }
+ }
+ else
+ fr->single = param.force_mono;
+
+ param.force_stereo &= ~0x2;
+ if(fr->single >= 0 && ai.channels == 2) {
+ param.force_stereo |= 0x2;
+ }
+
+ set_synth_functions(fr);
+ init_layer3(fr->down_sample_sblimit);
+ // reset_audio(); XXX: wha?
+ if(param.verbose) {
+ if(fr->down_sample == 3) {
+ long n = (long)param.pitch * freqs[fr->sampling_frequency];
+ long m = ai.rate;
+ if(n > m) {
+ fprintf(stderr,"Audio: %2.4f:1 conversion,",(float)n/(float)m);
+ }
+ else {
+ fprintf(stderr,"Audio: 1:%2.4f conversion,",(float)m/(float)n);
+ }
+ }
+ else {
+ fprintf(stderr,"Audio: %ld:1 conversion,",(long)pow(2.0,fr->down_sample));
+ }
+ fprintf(stderr," rate: %ld, encoding: %s, channels: %d\n",ai.rate,audio_encoding_name(ai.format),ai.channels);
+ }
+ }
+ }
+
+ if (fr->error_protection) {
+ /* skip crc, we are byte aligned here */
+ getbyte(&bsi);
+ getbyte(&bsi);
+ }
+
+ /* do the decoding */
+ switch(fr->lay) {
+ case 1:
+ if( (clip=do_layer1(mp,fr,param.outmode,&ai)) < 0 )
+ return 0;
+ break;
+ case 2:
+ if( (clip=do_layer2(mp,fr,param.outmode,&ai)) < 0 )
+ return 0;
+ break;
+ case 3:
+ if( (clip=do_layer3(mp,fr,param.outmode,&ai)) < 0 )
+ return 0;
+ break;
+ default:
+ clip = 0;
+ }
+
+ if(clip > 0 && param.checkrange)
+ fprintf(stderr,"%d samples clipped\n", clip);
+
+ return pcm_point / 4;
+}
+
+mpg123PlayObject_impl::mpg123PlayObject_impl()
+{
+ pcm_buf = new unsigned char[16384*2+1024*2];
+ mp = (struct mpstr *)malloc(sizeof(struct mpstr));
+ memset(mp, 0, sizeof(struct mpstr));
+ //memset(&mp->fr, 0, sizeof(struct frame)); XXX: why would I need to do this?
+
+ prgName = strdup("arts/mpg123");
+ prgVersion = strdup("$Revision$");
+ pcm_point = 0;
+ pcm_sample=pcm_buf; // just point this to our internal buffer
+ memset(&param, 0, sizeof(struct parameter));
+ param.halfspeed = 0;
+ param.outmode = DECODE_BUFFER+999;
+ param.usebuffer = 0;
+ param.down_sample = 0;
+ param.force_stereo = 1; // XXX was 0
+ param.force_mono = -1;
+ param.pitch = 1.0;
+ param.checkrange = 0;
+ param.outscale = 32768;
+ param.tryresync = 2;
+
+ equalfile = NULL;
+ struct shmid_ds bleh;
+ shm_id = shmget(IPC_PRIVATE, sizeof(*shm_buf), 0600);
+ shm_buf = (struct buf_t *)shmat(shm_id, 0, 0);
+ // mark it to be destroyed after the last detach
+ shmctl(shm_id, IPC_RMID, &bleh);
+ // sem0 has base, sem1 remaining space,sem2 seekTo
+ buflen_sem = semget(IPC_PRIVATE, 3, 0600);
+ child_pid = 0;
+}
+
+mpg123PlayObject_impl::~mpg123PlayObject_impl()
+{
+ artsdebug("Destroying PlayObject");
+ halt();
+ union semun semdat;
+ arts_debug("removing IPC resources");
+ semctl(buflen_sem,0,IPC_RMID,semdat);
+ // WABA: Don't remove the cast, it is needed on some platforms.
+ shmdt((char *)shm_buf);
+ delete pcm_buf;
+}
+
+bool mpg123PlayObject_impl::loadMedia(const string &filename)
+{
+// string filename = "http://131.174.33.2:9024/";
+ arts_debug("mpg123: loadMedia %s", filename.c_str());
+ halt(); // stop playing any previous stream
+ arts_debug("previous playback killed");
+ struct sembuf semoper;
+ union semun semdat;
+
+ semoper.sem_flg = 0; // normal blocking semaphores
+
+ semdat.val = 0;
+ if(semctl(buflen_sem,0,SETVAL,semdat)) // no data in the queue
+ arts_debug("couldn't clear queue");
+ semdat.val = 0;
+ if(semctl(buflen_sem,2,SETVAL,semdat)) // seekTo is -1 (ie, no seek)
+ arts_debug("couldn't clear seekTo");
+ semdat.val = BACKBUFSIZ;
+ if(semctl(buflen_sem,1,SETVAL,semdat)) // setup the starting free space
+ arts_debug("couldn't mark buffer empty");
+
+ buf_pos = 0;
+
+ //throw off a process to handle the decoding
+ if((child_pid = fork())) {
+ return true; // all further setup happens in the child
+ }
+ arts_debug("child process");
+ initialise_decoder();
+
+ snprintf(param.filename, 250, filename.c_str());
+ memset(&ai, 0, sizeof(struct audio_info_struct));
+ mp->fr.sampling_frequency = 0;
+ mp->fr.down_sample = 0;
+ mp->fr.single = -1;
+ mp->fr.down_sample_sblimit = SBLIMIT>>(mp->fr.down_sample);
+ sample_freq = freqs[mp->fr.sampling_frequency]>>(param.down_sample);
+
+ // audio_info_struct_init
+ ai.rate = 44100;
+ ai.gain = -1;
+ ai.output = AUDIO_OUT_LINE_OUT;
+ ai.device = 0;
+ ai.channels = 2;
+ ai.format = AUDIO_FORMAT_SIGNED_16;
+ audio_capabilities(&ai);
+
+ set_synth_functions(&mp->fr);
+
+ if (rd)
+ rd->close(rd);
+ if (!open_stream(filename.c_str(), -1)) {
+ printf("erorr opening stream\n");
+ return 0;
+ }
+
+ mpeg_name[0] = 0;
+ snprintf(mpeg_name, 1000, filename.c_str());
+ if (strstr(filename.c_str(), "http://") != NULL) {
+ sprintf(mpeg_name, "ShoutCast from %s\n", filename.c_str());
+ streaming = 1;
+ }
+
+ read_frame_init(&mp->fr);
+
+ XHEADDATA xingHeader;
+
+ shm_buf->pos = 0;
+
+ read_frame(rd,&mp->fr); // read in a frame for the xing code to play with
+ bool gotXing = false;
+ if(!streaming) {
+ gotXing = mpg123_stream_check_for_xing_header(&mp->fr,&xingHeader);
+ if(gotXing)
+ shm_buf->len = xingHeader.frames;
+ else // assume no VBR for non-Xing
+ shm_buf->len = static_cast<unsigned long>(rd->filelen / compute_bpf(&mp->fr));
+ } else {
+ shm_buf->len = 1;
+ }
+ // can't calculate tpf until we reach a non-header frame
+
+ int skipped = 0;
+ if (sync_stream(rd, &mp->fr, 0xffff, &skipped) <= 0) {
+ fprintf(stderr,"Can't find frame start");
+ rd->close(rd);
+ return 0;
+ }
+
+
+/*
+ if (!mpeg_get_frame_info(filename.c_str())) {
+ printf("mpeg_get_frame_info(%s) failed\n", filename.c_str());
+ return 0;
+ }
+*/
+ arts_debug("mpg123: loadMedia %s got %s", filename.c_str(), mpeg_name);
+
+ short *decode_buf = reinterpret_cast<short *>(pcm_sample);
+ bool init=true;
+ do {
+ // get more data
+
+ int seekTo = semctl(buflen_sem, 2, GETVAL, semdat);
+ if (seekTo) { // we need to seek, to sync back up
+ unsigned long offset;
+ arts_debug("seeking to %d\n", seekTo);
+ if(gotXing && (xingHeader.flags & TOC_FLAG) && xingHeader.toc) // do we have a table of contents?
+ offset = mpg123_seek_point(xingHeader.toc,rd->filelen,100 * (seekTo -1) / double(shm_buf->len)); // relative position in file
+ else
+ offset = static_cast<unsigned long>(rd->filelen * ((seekTo-1) / double(shm_buf->len))); // the crude ole' fashioned way
+ rd->rewind(rd);
+ lseek(rd->filept, offset, SEEK_SET);
+
+ // now we need to sync back up :-)
+ read_frame(rd,&mp->fr);
+ read_frame(rd,&mp->fr);
+ // if (sync_stream(rd, &mp->fr, 0xffff, &skipped) <= 0) {
+ // arts_debug("Can't find frame start");
+ // rd->close(rd);
+ // break;
+ // }
+ shm_buf->pos = seekTo; // assume we got the frame we were after? I don't have a better idea...
+ semdat.val = 0;
+ semctl(buflen_sem, 2, SETVAL, semdat); // we've done it
+ }
+
+ if (!read_frame(rd,&mp->fr)) {
+ // mpg123 says we're done, or we errored (in which case we're done)
+ arts_debug("out of frames, exiting");
+ break;
+ }
+
+ if(init) // need to figure this one out with a real audio frame...
+ {
+ arts_debug("samplerate: %d (%d)",mp->fr.sampling_frequency,freqs[mp->fr.sampling_frequency]>>(param.down_sample));
+ shm_buf->tpf = compute_tpf(&mp->fr);
+ }
+ int thisPass = play_frame(init);
+ if(init) // need to figure this one out with a real audio frame...
+ arts_debug("samplerate: %d",mp->fr.sampling_frequency);
+ init=false; // no longer init :-)
+
+ semoper.sem_num = 1;
+ semoper.sem_op = -thisPass;
+ semop(buflen_sem, &semoper, 1);
+
+ // block until there's enough space to stick in this frame
+ int roomFor = semctl(buflen_sem, 1, GETVAL, semdat);
+ if (roomFor > BACKBUFSIZ) {
+ arts_debug("exit requested (%d slots available), bye!",roomFor);
+ // this can never go above BACKBUFSIZ in normal operation,
+ // the consumer wants us to exit
+ break;
+ }
+
+ //arts_debug("decoded %d frames (%d avail)",thisPass,roomFor);
+
+ for(int i=0 ; i <thisPass ;
+ ++i, buf_pos = ((buf_pos + 1) % BACKBUFSIZ)) {
+ shm_buf->left[buf_pos] = conv_16le_float(decode_buf[2*i]);
+ shm_buf->right[buf_pos] = conv_16le_float(decode_buf[2*i+1]);
+ }
+ shm_buf->pos++; // ran another frame through the mill
+ pcm_point=0;
+ //arts_debug("enqueued them");
+ semoper.sem_num = 0;
+ semoper.sem_op = thisPass;
+ semop(buflen_sem,&semoper,1); // mark the additional data now available
+
+ //arts_debug("calculated %d more samples",shm_buf->backbuflen );
+ } while(1);
+
+ //signal completion
+ semdat.val = 0;
+ // no more data available
+ semctl(buflen_sem, 0, SETVAL, semdat);
+ // and no room either (ie, none coming)
+ semctl(buflen_sem, 1, SETVAL, semdat);
+
+ arts_debug("decoder process exiting");
+ exit(0);
+ return true;
+}
+
+string mpg123PlayObject_impl::description()
+{
+ return "mpg123 artsplug - w00t!";
+}
+
+//XXX
+poTime mpg123PlayObject_impl::currentTime()
+{
+ return poTime(shm_buf->pos * shm_buf->tpf, 0, 0, "none");
+}
+
+//XXX
+poTime mpg123PlayObject_impl::overallTime()
+{
+ return poTime(shm_buf->len * shm_buf->tpf, 0, 0, "none");
+}
+
+poCapabilities mpg123PlayObject_impl::capabilities()
+{
+ return static_cast<poCapabilities>(capPause | capSeek);
+}
+
+//YYY
+string mpg123PlayObject_impl::mediaName()
+{
+ return param.filename;
+}
+
+poState mpg123PlayObject_impl::state()
+{
+ return mState;
+}
+
+void mpg123PlayObject_impl::play()
+{
+ arts_debug("mpg123: play");
+ mState = posPlaying;
+}
+
+void mpg123PlayObject_impl::halt()
+{
+ mState = posIdle;
+ union semun semdat;
+
+ if (child_pid) {
+ arts_debug("killing decoder process");
+ semdat.val = 2*BACKBUFSIZ;
+ semctl(buflen_sem, 1, SETVAL, semdat);
+ waitpid(child_pid, NULL, 0);
+ child_pid = 0;
+ }
+ // tell the producer to exit (would also result in us halting, if we weren't already)
+
+ // mainly this is to ensure that the decoder wakes up to notice
+}
+
+//XXX disabled for now
+void mpg123PlayObject_impl::seek(const class poTime &t)
+{
+ union semun foo;
+
+ // this index is one-based so 0 can represent no seek
+ foo.val = static_cast<int>(t.seconds / shm_buf->tpf + 1);
+ arts_debug("requesting seek to %d", foo.val);
+ semctl(buflen_sem, 2, SETVAL, foo); // we've done it
+}
+
+/* Pause implemented on the streaming-side - decoding will simply block on it's own */
+void mpg123PlayObject_impl::pause()
+{
+ mState = posPaused;
+}
+
+/*
+ * SynthModule interface
+ * - where is stop? initialize?
+ */
+
+void mpg123PlayObject_impl::streamInit()
+{
+ arts_debug("streamInit");
+}
+
+void mpg123PlayObject_impl::streamStart()
+{
+ arts_debug("streamStart");
+}
+
+void mpg123PlayObject_impl::calculateBlock(unsigned long samples)
+{
+ int samplesAvailable = 0;
+
+ //arts_debug("calculateBlock");
+
+ if (mState==posPlaying) {
+ //arts_debug("calculateBlock, %d(%d) of %d samples in buffer",
+ //shm_buf->buflen - bufpos, shm_buf->backbuflen,samples);
+
+ struct sembuf bleh;
+
+ bleh.sem_num = 0;
+ bleh.sem_flg = IPC_NOWAIT;
+
+ //arts_debug("%d samples wanted", samplesAvailable);
+ bleh.sem_op = -samples; // does the buffer have sufficient samples?
+ if (semop(buflen_sem, &bleh, 1) == -1) {
+ if (errno == EAGAIN) {
+ union semun semdat;
+ arts_debug("buffer underrun");
+// samplesAvailable = semctl(buflen_sem,0,GETVAL,semdat);
+// if (semctl(buflen_sem, 1, GETVAL, semdat) == 0) {
+// samplesAvailable = semctl(buflen_sem,0,GETVAL,semdat);
+ if ((semctl(buflen_sem, 1, GETVAL, semdat) == 0) && (semctl(buflen_sem,0,GETVAL,semdat) == 0))
+ {
+ arts_debug("decoder requested exit");
+ // no samples AND no room is the decoder's way of signalling completion
+ halt();
+ // samplesAvailable = 0;
+ }
+ samplesAvailable = 0; //
+ } else {
+ arts_debug("something awful happened to our semaphores...");
+ // something awful has happened
+ halt();
+ samplesAvailable = 0;
+ }
+ } else {
+ samplesAvailable = samples; // number of samples we pushed from buffers
+ // used to calculate the number we should zero out for an underrun
+ }
+ bleh.sem_flg = 0; // back to normal now
+
+ if(samplesAvailable) {
+ //arts_debug("%d samples available",samplesAvailable);
+ for (int i = 0; i < samplesAvailable;
+ ++i, buf_pos = ((buf_pos + 1) % BACKBUFSIZ)) {
+
+ left[i] = shm_buf->left[buf_pos];
+ right[i] = shm_buf->right[buf_pos];
+ }
+
+ bleh.sem_num = 1;
+ bleh.sem_op = samplesAvailable;
+ // 0 here CAN block, which is why this is in an if(samplesAvailable)
+ semop(buflen_sem, &bleh, 1); // mark the now-free space
+ }
+ }
+ // zero out any samples we didn't have enough to complete - no buzz of death!
+ while(static_cast<unsigned long>(samplesAvailable) < samples) {
+ left[samplesAvailable] = 0.0;
+ right[samplesAvailable] = 0.0;
+ samplesAvailable++;
+ }
+}
+
+void mpg123PlayObject_impl::streamEnd()
+{
+ arts_debug("streamEnd");
+}
+
+REGISTER_IMPLEMENTATION(mpg123PlayObject_impl);
+
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