/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2005 Dave Chapman * * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "codeclib.h" #include #include CODEC_HEADER #if (CONFIG_CPU == PP5024 || CONFIG_CPU == PP5022 || CONFIG_CPU == PP5020 \ || CONFIG_CPU == PP5002) && !defined(MPEGPLAYER) #define MPA_SYNTH_ON_COP #endif struct mad_stream stream IBSS_ATTR; struct mad_frame frame IBSS_ATTR; struct mad_synth synth IBSS_ATTR; #ifdef MPA_SYNTH_ON_COP volatile short synth_running IBSS_ATTR; /*synthesis is running*/ volatile short die IBSS_ATTR; /*thread should die*/ #if (CONFIG_CPU == PP5024) || (CONFIG_CPU == PP5022) mad_fixed_t sbsample_prev[2][36][32] IBSS_ATTR; #else mad_fixed_t sbsample_prev[2][36][32] SHAREDBSS_ATTR; #endif struct semaphore synth_done_sem IBSS_ATTR; struct semaphore synth_pending_sem IBSS_ATTR; #endif #define INPUT_CHUNK_SIZE 8192 mad_fixed_t mad_frame_overlap[2][32][18] IBSS_ATTR; mad_fixed_t sbsample[2][36][32] IBSS_ATTR; unsigned char mad_main_data[MAD_BUFFER_MDLEN] IBSS_ATTR; /* TODO: what latency does layer 1 have? */ int mpeg_latency[3] = { 0, 481, 529 }; int mpeg_framesize[3] = {384, 1152, 1152}; void init_mad(void) { ci->memset(&stream, 0, sizeof(struct mad_stream)); ci->memset(&frame, 0, sizeof(struct mad_frame)); ci->memset(&synth, 0, sizeof(struct mad_synth)); #ifdef MPA_SYNTH_ON_COP frame.sbsample_prev = &sbsample_prev; #else frame.sbsample_prev = &sbsample; #endif frame.sbsample=&sbsample; mad_stream_init(&stream); mad_frame_init(&frame); mad_synth_init(&synth); /* We do this so libmad doesn't try to call codec_calloc() */ ci->memset(mad_frame_overlap, 0, sizeof(mad_frame_overlap)); frame.overlap = &mad_frame_overlap; stream.main_data = &mad_main_data; } int get_file_pos(int newtime) { int pos = -1; struct mp3entry *id3 = ci->id3; if (id3->vbr) { if (id3->has_toc) { /* Use the TOC to find the new position */ unsigned int percent, remainder; int curtoc, nexttoc, plen; percent = (newtime*100) / id3->length; if (percent > 99) percent = 99; curtoc = id3->toc[percent]; if (percent < 99) { nexttoc = id3->toc[percent+1]; } else { nexttoc = 256; } pos = (id3->filesize/256)*curtoc; /* Use the remainder to get a more accurate position */ remainder = (newtime*100) % id3->length; remainder = (remainder*100) / id3->length; plen = (nexttoc - curtoc)*(id3->filesize/256); pos += (plen/100)*remainder; } else { /* No TOC exists, estimate the new position */ pos = (id3->filesize / (id3->length / 1000)) * (newtime / 1000); } } else if (id3->bitrate) { pos = newtime * (id3->bitrate / 8); } else { return -1; } pos += id3->first_frame_offset; /* Don't seek right to the end of the file so that we can transition properly to the next song */ if (pos >= (int)(id3->filesize - id3->id3v1len)) pos = id3->filesize - id3->id3v1len - 1; return pos; } static void set_elapsed(struct mp3entry* id3) { unsigned long offset = id3->offset > id3->first_frame_offset ? id3->offset - id3->first_frame_offset : 0; if ( id3->vbr ) { if ( id3->has_toc ) { /* calculate elapsed time using TOC */ int i; unsigned int remainder, plen, relpos, nextpos; /* find wich percent we're at */ for (i=0; i<100; i++ ) if ( offset < id3->toc[i] * (id3->filesize / 256) ) break; i--; if (i < 0) i = 0; relpos = id3->toc[i]; if (i < 99) nextpos = id3->toc[i+1]; else nextpos = 256; remainder = offset - (relpos * (id3->filesize / 256)); /* set time for this percent (divide before multiply to prevent overflow on long files. loss of precision is negligible on short files) */ id3->elapsed = i * (id3->length / 100); /* calculate remainder time */ plen = (nextpos - relpos) * (id3->filesize / 256); id3->elapsed += (((remainder * 100) / plen) * (id3->length / 10000)); } else { /* no TOC exists. set a rough estimate using average bitrate */ int tpk = id3->length / ((id3->filesize - id3->first_frame_offset - id3->id3v1len) / 1024); id3->elapsed = offset / 1024 * tpk; } } else { /* constant bitrate, use exact calculation */ if (id3->bitrate != 0) id3->elapsed = offset / (id3->bitrate / 8); } } #ifdef MPA_SYNTH_ON_COP /* * Run the synthesis filter on the COProcessor */ static int mad_synth_thread_stack[DEFAULT_STACK_SIZE/sizeof(int)/2] IBSS_ATTR; static const unsigned char * const mad_synth_thread_name = "mp3dec"; static struct thread_entry *mad_synth_thread_p; static void mad_synth_thread(void){ while(1){ ci->semaphore_wait(&synth_pending_sem); if(die){ die=0; invalidate_icache(); return ; } synth_running = 1; mad_synth_frame(&synth, &frame); synth_running = 0; ci->semaphore_release(&synth_done_sem); } } static int mad_synth_thread_wait_pcm(void){ ci->semaphore_wait(&synth_done_sem); return 0; } static void mad_synth_thread_ready(void){ mad_fixed_t (*temp)[2][36][32]; while(1){ /*check if synth is currently running before changing its inputs! */ if(!synth_running){ /*circular buffer that holds 2 frames' samples*/ temp=frame.sbsample; frame.sbsample = frame.sbsample_prev; frame.sbsample_prev=temp; ci->semaphore_release(&synth_pending_sem); return ; } ci->yield(); /*synth thread currently running, wait for it*/ } } static int mad_synth_thread_create(void){ synth_running=0; die=0; ci->semaphore_init(&synth_done_sem, 1, 0); ci->semaphore_init(&synth_pending_sem, 1, 0); mad_synth_thread_p = ci->create_thread(mad_synth_thread, mad_synth_thread_stack, sizeof(mad_synth_thread_stack), 0, mad_synth_thread_name IF_PRIO(, PRIORITY_PLAYBACK), COP); if (mad_synth_thread_p == NULL) return false; return true; } #else static void mad_synth_thread_ready(void){ mad_synth_frame(&synth, &frame); } static int mad_synth_thread_create(void){ return 0; } static int mad_synth_thread_wait_pcm(void){ return 0; } #endif /* this is the codec entry point */ enum codec_status codec_main(void) { int status; size_t size; int file_end; int samples_to_skip; /* samples to skip in total for this file (at start) */ char *inputbuffer; int64_t samplesdone; int stop_skip, start_skip; int current_stereo_mode = -1; unsigned long current_frequency = 0; int framelength; int padding = MAD_BUFFER_GUARD; /* to help mad decode the last frame */ if (codec_init()) return CODEC_ERROR; /* Create a decoder instance */ ci->configure(DSP_SET_SAMPLE_DEPTH, MAD_F_FRACBITS); next_track: /*does nothing on 1 processor systems*/ mad_synth_thread_create(); status = CODEC_OK; /* Reinitializing seems to be necessary to avoid playback quircks when seeking. */ init_mad(); file_end = 0; while (!*ci->taginfo_ready && !ci->stop_codec) ci->sleep(1); ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency); current_frequency = ci->id3->frequency; codec_set_replaygain(ci->id3); if (ci->id3->offset) { ci->seek_buffer(ci->id3->offset); set_elapsed(ci->id3); } else ci->seek_buffer(ci->id3->first_frame_offset); if (ci->id3->lead_trim >= 0 && ci->id3->tail_trim >= 0) { stop_skip = ci->id3->tail_trim - mpeg_latency[ci->id3->layer]; if (stop_skip < 0) stop_skip = 0; start_skip = ci->id3->lead_trim + mpeg_latency[ci->id3->layer]; } else { stop_skip = 0; /* We want to skip this amount anyway */ start_skip = mpeg_latency[ci->id3->layer]; } /* Libmad will not decode the last frame without 8 bytes of extra padding in the buffer. So, we can trick libmad into not decoding the last frame if we are to skip it entirely and then cut the appropriate samples from final frame that we did decode. Note, if all tags (ID3, APE) are not properly stripped from the end of the file, this trick will not work. */ if (stop_skip >= mpeg_framesize[ci->id3->layer]) { padding = 0; stop_skip -= mpeg_framesize[ci->id3->layer]; } else { padding = MAD_BUFFER_GUARD; } samplesdone = ((int64_t)ci->id3->elapsed) * current_frequency / 1000; /* Don't skip any samples unless we start at the beginning. */ if (samplesdone > 0) samples_to_skip = 0; else samples_to_skip = start_skip; framelength = 0; /* This is the decoding loop. */ while (1) { ci->yield(); if (ci->stop_codec || ci->new_track) break; if (ci->seek_time) { int newpos; samplesdone = ((int64_t)(ci->seek_time-1))*current_frequency/1000; if (ci->seek_time-1 == 0) { newpos = ci->id3->first_frame_offset; samples_to_skip = start_skip; } else { newpos = get_file_pos(ci->seek_time-1); samples_to_skip = 0; } if (!ci->seek_buffer(newpos)) break; ci->seek_complete(); init_mad(); framelength = 0; } /* Lock buffers */ if (stream.error == 0) { inputbuffer = ci->request_buffer(&size, INPUT_CHUNK_SIZE); if (size == 0 || inputbuffer == NULL) break; mad_stream_buffer(&stream, (unsigned char *)inputbuffer, size + padding); } if (mad_frame_decode(&frame, &stream)) { if (stream.error == MAD_FLAG_INCOMPLETE || stream.error == MAD_ERROR_BUFLEN) { /* This makes the codec support partially corrupted files */ if (file_end == 30) break; /* Fill the buffer */ if (stream.next_frame) ci->advance_buffer_loc((void *)stream.next_frame); else ci->advance_buffer(size); stream.error = 0; file_end++; continue; } else if (MAD_RECOVERABLE(stream.error)) { continue; } else { /* Some other unrecoverable error */ status = CODEC_ERROR; break; } break; } file_end = 0; /* Do the pcmbuf insert here. Note, this is the PREVIOUS frame's pcm data (not the one just decoded above). When we exit the decoding loop we will need to process the final frame that was decoded. */ if (framelength > 0) { mad_synth_thread_wait_pcm(); /* In case of a mono file, the second array will be ignored. */ ci->pcmbuf_insert(&synth.pcm.samples[0][samples_to_skip], &synth.pcm.samples[1][samples_to_skip], framelength); /* Only skip samples for the first frame added. */ samples_to_skip = 0; } mad_synth_thread_ready(); //mad_synth_frame(&synth, &frame); /* Check if sample rate and stereo settings changed in this frame. */ if (frame.header.samplerate != current_frequency) { current_frequency = frame.header.samplerate; ci->configure(DSP_SWITCH_FREQUENCY, current_frequency); } if (MAD_NCHANNELS(&frame.header) == 2) { if (current_stereo_mode != STEREO_NONINTERLEAVED) { ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED); current_stereo_mode = STEREO_NONINTERLEAVED; } } else { if (current_stereo_mode != STEREO_MONO) { ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO); current_stereo_mode = STEREO_MONO; } } if (stream.next_frame) ci->advance_buffer_loc((void *)stream.next_frame); else ci->advance_buffer(size); framelength = synth.pcm.length - samples_to_skip; if (framelength < 0) { framelength = 0; samples_to_skip -= synth.pcm.length; } samplesdone += framelength; ci->set_elapsed(samplesdone / (current_frequency / 1000)); } /* Finish the remaining decoded frame. Cut the required samples from the end. */ if (framelength > stop_skip){ mad_synth_thread_wait_pcm(); ci->pcmbuf_insert(synth.pcm.samples[0], synth.pcm.samples[1], framelength - stop_skip); } #ifdef MPA_SYNTH_ON_COP /*mop up COP thread*/ die=1; ci->semaphore_release(&synth_pending_sem); ci->thread_wait(mad_synth_thread_p); invalidate_icache(); stream.error = 0; #endif if (ci->request_next_track()) goto next_track; return status; }