/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2005 Dave Chapman * * All files in this archive are subject to the GNU General Public License. * See the file COPYING in the source tree root for full license agreement. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "codec.h" #include #include "playback.h" #include "dsp.h" #include "mp3data.h" #include "lib/codeclib.h" struct mad_stream Stream IDATA_ATTR; struct mad_frame Frame IDATA_ATTR; struct mad_synth Synth IDATA_ATTR; mad_timer_t Timer; /* The following function is used inside libmad - let's hope it's never called. */ void abort(void) { } #define INPUT_CHUNK_SIZE 8192 #define OUTPUT_BUFFER_SIZE 65536 /* Must be an integer multiple of 4. */ unsigned char OutputBuffer[OUTPUT_BUFFER_SIZE]; unsigned char *OutputPtr; unsigned char *GuardPtr = NULL; const unsigned char *OutputBufferEnd = OutputBuffer + OUTPUT_BUFFER_SIZE; mad_fixed_t mad_frame_overlap[2][32][18] IDATA_ATTR; unsigned char mad_main_data[MAD_BUFFER_MDLEN] IDATA_ATTR; /* TODO: what latency does layer 1 have? */ int mpeg_latency[3] = { 0, 481, 529 }; #ifdef USE_IRAM extern char iramcopy[]; extern char iramstart[]; extern char iramend[]; #endif /* this is the codec entry point */ enum codec_status codec_start(struct codec_api* api) { struct codec_api *ci = api; struct mp3info *info; int Status = 0; size_t size; int file_end; char *InputBuffer; unsigned int samplecount; unsigned int samplesdone; bool first_frame; int stop_skip, start_skip; int current_stereo_mode = -1; int frequency_divider; /* Generic codec inititialisation */ TEST_CODEC_API(api); #ifdef USE_IRAM ci->memcpy(iramstart, iramcopy, iramend - iramstart); #endif /* This function sets up the buffers and reads the file into RAM */ if (codec_init(api)) { return CODEC_ERROR; } /* Create a decoder instance */ ci->configure(CODEC_SET_FILEBUF_LIMIT, (int *)(1024*1024*2)); ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*16)); ci->configure(DSP_SET_CLIP_MIN, (int *)-MAD_F_ONE); ci->configure(DSP_SET_CLIP_MAX, (int *)(MAD_F_ONE - 1)); ci->configure(DSP_SET_SAMPLE_DEPTH, (int *)(MAD_F_FRACBITS)); ci->configure(DSP_DITHER, (bool *)false); ci->configure(CODEC_DSP_ENABLE, (bool *)true); ci->memset(&Stream, 0, sizeof(struct mad_stream)); ci->memset(&Frame, 0, sizeof(struct mad_frame)); ci->memset(&Synth, 0, sizeof(struct mad_synth)); ci->memset(&Timer, 0, sizeof(mad_timer_t)); mad_stream_init(&Stream); mad_frame_init(&Frame); mad_synth_init(&Synth); mad_timer_reset(&Timer); /* We do this so libmad doesn't try to call codec_calloc() */ memset(mad_frame_overlap, 0, sizeof(mad_frame_overlap)); Frame.overlap = &mad_frame_overlap; Stream.main_data = &mad_main_data; /* This label might need to be moved above all the init code, but I don't think reiniting the codec is necessary for MPEG. It might even be unwanted for gapless playback */ next_track: info = ci->mp3data; first_frame = false; file_end = 0; OutputPtr = OutputBuffer; frequency_divider = ci->id3->frequency / 100; while (!*ci->taginfo_ready) ci->yield(); ci->configure(DSP_SET_FREQUENCY, (int *)ci->id3->frequency); ci->request_buffer(&size, ci->id3->first_frame_offset); ci->advance_buffer(size); if (info->enc_delay >= 0 && info->enc_padding >= 0) { stop_skip = info->enc_padding - mpeg_latency[info->layer]; if (stop_skip < 0) stop_skip = 0; start_skip = info->enc_delay + mpeg_latency[info->layer]; } else { stop_skip = 0; /* We want to skip this amount anyway */ start_skip = mpeg_latency[info->layer]; } /* NOTE: currently this doesn't work, the below calculated samples_count seems to be right, but sometimes libmad just can't supply us with all the data we need... */ if (info->frame_count) { /* TODO: 1152 is the frame size in samples for MPEG1 layer 2 and layer 3, it's probably not correct at all for MPEG2 and layer 1 */ samplecount = info->frame_count*1152 - (start_skip + stop_skip); samplesdone = ci->id3->elapsed * frequency_divider / 10; } else { samplecount = ci->id3->length * frequency_divider / 10; samplesdone = ci->id3->elapsed * frequency_divider / 10; } /* This is the decoding loop. */ while (1) { ci->yield(); if (ci->stop_codec || ci->reload_codec) { break ; } if (ci->seek_time) { unsigned int sample_loc; int newpos; sample_loc = ci->seek_time * frequency_divider / 10; newpos = ci->mp3_get_filepos(ci->seek_time-1); if (sample_loc >= samplecount + samplesdone) break ; if (ci->seek_buffer(newpos)) { samplecount += samplesdone - sample_loc; samplesdone = sample_loc; } ci->seek_time = 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, InputBuffer, size); } if(mad_frame_decode(&Frame,&Stream)) { if (Stream.error == MAD_FLAG_INCOMPLETE || Stream.error == MAD_ERROR_BUFLEN) { // ci->splash(HZ*1, true, "Incomplete"); /* This makes the codec to support partially corrupted files too. */ if (file_end == 30) break ; /* Fill the buffer */ Stream.error = 0; file_end++; continue ; } else if(MAD_RECOVERABLE(Stream.error)) { if(Stream.error!=MAD_ERROR_LOSTSYNC || Stream.this_frame!=GuardPtr) { // rb->splash(HZ*1, true, "Recoverable...!"); } continue; } else if(Stream.error==MAD_ERROR_BUFLEN) { //rb->splash(HZ*1, true, "Buflen error"); break ; } else { //rb->splash(HZ*1, true, "Unrecoverable error"); Status=1; break; } } if (Stream.next_frame) ci->advance_buffer_loc((void *)Stream.next_frame); file_end = false; /* ?? Do we need the timer module? */ // mad_timer_add(&Timer,Frame.header.duration); mad_synth_frame(&Synth,&Frame); /* Convert MAD's numbers to an array of 16-bit LE signed integers */ /* We skip start_skip number of samples here, this should only happen for very first frame in the stream. */ /* TODO: possible for start_skip to exceed one frames worth of samples? */ if (MAD_NCHANNELS(&Frame.header) == 2) { if (current_stereo_mode != STEREO_NONINTERLEAVED) { ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_NONINTERLEAVED); current_stereo_mode = STEREO_NONINTERLEAVED; } ci->audiobuffer_insert_split(&Synth.pcm.samples[0][start_skip], &Synth.pcm.samples[1][start_skip], (Synth.pcm.length - start_skip) * 4); } else { if (current_stereo_mode != STEREO_MONO) { ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_MONO); current_stereo_mode = STEREO_MONO; } ci->audiobuffer_insert((char *)&Synth.pcm.samples[0][start_skip], (Synth.pcm.length - start_skip) * 4); } start_skip = 0; /* not very elegant, and might want to keep this value */ samplesdone += Synth.pcm.length; samplecount -= Synth.pcm.length; ci->set_elapsed(samplesdone / (frequency_divider / 10)); } Stream.error = 0; if (ci->request_next_track()) goto next_track; return CODEC_OK; }