/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (c) 2005 Jvo Studer * * 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 CODEC_HEADER /* Macro that sign extends an unsigned byte */ #define SE(x) ((int32_t)((int8_t)(x))) /* This codec supports AIFF files with the following formats: * - PCM, 8, 16 and 24 bits, mono or stereo */ enum { AIFF_FORMAT_PCM = 0x0001, /* AIFF PCM Format (big endian) */ IEEE_FORMAT_FLOAT = 0x0003, /* IEEE Float */ AIFF_FORMAT_ALAW = 0x0004, /* AIFC ALaw compressed */ AIFF_FORMAT_ULAW = 0x0005 /* AIFC uLaw compressed */ }; /* Maximum number of bytes to process in one iteration */ /* for 44.1kHz stereo 16bits, this represents 0.023s ~= 1/50s */ #define AIF_CHUNK_SIZE (1024*2) static int32_t samples[AIF_CHUNK_SIZE] IBSS_ATTR; enum codec_status codec_main(void) { uint32_t numbytes, bytesdone; uint16_t num_channels = 0; uint32_t num_sample_frames = 0; uint16_t sample_size = 0; uint32_t sample_rate = 0; uint32_t i; size_t n; int bufcount; int endofstream; unsigned char *buf; uint8_t *aifbuf; long chunksize; uint32_t offset2snd = 0; uint16_t block_size = 0; uint32_t avgbytespersec = 0; off_t firstblockposn; /* position of the first block in file */ /* Generic codec initialisation */ ci->configure(DSP_SET_SAMPLE_DEPTH, 28); next_track: if (codec_init()) { i = CODEC_ERROR; goto exit; } while (!*ci->taginfo_ready && !ci->stop_codec) ci->sleep(1); codec_set_replaygain(ci->id3); /* assume the AIFF header is less than 1024 bytes */ buf = ci->request_buffer(&n, 1024); if (n < 54) { i = CODEC_ERROR; goto done; } if ((memcmp(buf, "FORM", 4) != 0) || (memcmp(&buf[8], "AIFF", 4) != 0)) { i = CODEC_ERROR; goto done; } buf += 12; n -= 12; numbytes = 0; /* read until 'SSND' chunk, which typically is last */ while (numbytes == 0 && n >= 8) { /* chunkSize */ i = ((buf[4]<<24)|(buf[5]<<16)|(buf[6]<<8)|buf[7]); if (memcmp(buf, "COMM", 4) == 0) { if (i < 18) { DEBUGF("CODEC_ERROR: 'COMM' chunk size=%lu < 18\n", (unsigned long)i); i = CODEC_ERROR; goto done; } /* num_channels */ num_channels = ((buf[8]<<8)|buf[9]); /* num_sample_frames */ num_sample_frames = ((buf[10]<<24)|(buf[11]<<16)|(buf[12]<<8) |buf[13]); /* sample_size */ sample_size = ((buf[14]<<8)|buf[15]); /* sample_rate (don't use last 4 bytes, only integer fs) */ if (buf[16] != 0x40) { DEBUGF("CODEC_ERROR: weird sampling rate (no @)\n"); i = CODEC_ERROR; goto done; } sample_rate = ((buf[18]<<24)|(buf[19]<<16)|(buf[20]<<8)|buf[21])+1; sample_rate = sample_rate >> (16 + 14 - buf[17]); /* calc average bytes per second */ avgbytespersec = sample_rate*num_channels*sample_size/8; } else if (memcmp(buf, "SSND", 4)==0) { if (sample_size == 0) { DEBUGF("CODEC_ERROR: unsupported chunk order\n"); i = CODEC_ERROR; goto done; } /* offset2snd */ offset2snd = (buf[8]<<24)|(buf[9]<<16)|(buf[10]<<8)|buf[11]; /* block_size */ block_size = (buf[12]<<24)|(buf[13]<<16)|(buf[14]<<8)|buf[15]; if (block_size == 0) block_size = num_channels*sample_size; numbytes = i - 8 - offset2snd; i = 8 + offset2snd; /* advance to the beginning of data */ } else { DEBUGF("unsupported AIFF chunk: '%c%c%c%c', size=%lu\n", buf[0], buf[1], buf[2], buf[3], (unsigned long)i); } if (i & 0x01) /* odd chunk sizes must be padded */ i++; buf += i + 8; if (n < (i + 8)) { DEBUGF("CODEC_ERROR: AIFF header size > 1024\n"); i = CODEC_ERROR; goto done; } n -= i + 8; } /* while 'SSND' */ if (num_channels == 0) { DEBUGF("CODEC_ERROR: 'COMM' chunk not found or 0-channels file\n"); i = CODEC_ERROR; goto done; } if (numbytes == 0) { DEBUGF("CODEC_ERROR: 'SSND' chunk not found or has zero length\n"); i = CODEC_ERROR; goto done; } if (sample_size > 24) { DEBUGF("CODEC_ERROR: PCM with more than 24 bits per sample " "is unsupported\n"); i = CODEC_ERROR; goto done; } ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency); if (num_channels == 2) { ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED); } else if (num_channels == 1) { ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO); } else { DEBUGF("CODEC_ERROR: more than 2 channels unsupported\n"); i = CODEC_ERROR; goto done; } firstblockposn = 1024 - n; ci->advance_buffer(firstblockposn); /* The main decoder loop */ bytesdone = 0; ci->set_elapsed(0); endofstream = 0; /* chunksize is computed so that one chunk is about 1/50s. * this make 4096 for 44.1kHz 16bits stereo. * It also has to be a multiple of blockalign */ chunksize = (1 + avgbytespersec/(50*block_size))*block_size; /* check that the output buffer is big enough (convert to samplespersec, then round to the block_size multiple below) */ if (((uint64_t)chunksize*ci->id3->frequency*num_channels*2) /(uint64_t)avgbytespersec >= AIF_CHUNK_SIZE) { chunksize = ((uint64_t)AIF_CHUNK_SIZE*avgbytespersec /((uint64_t)ci->id3->frequency*num_channels*2 *block_size))*block_size; } while (!endofstream) { ci->yield(); if (ci->stop_codec || ci->new_track) break; if (ci->seek_time) { uint32_t newpos; /* use avgbytespersec to round to the closest blockalign multiple, add firstblockposn. 64-bit casts to avoid overflows. */ newpos = (((uint64_t)avgbytespersec*(ci->seek_time - 1)) /(1000LL*block_size))*block_size; if (newpos > numbytes) break; if (ci->seek_buffer(firstblockposn + newpos)) bytesdone = newpos; ci->seek_complete(); } aifbuf = (uint8_t *)ci->request_buffer(&n, chunksize); if (n == 0) break; /* End of stream */ if (bytesdone + n > numbytes) { n = numbytes - bytesdone; endofstream = 1; } if (sample_size > 24) { for (i = 0; i < n; i += 4) { samples[i/4] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13) |(aifbuf[i + 2]<<5)|(aifbuf[i + 3]>>3); } bufcount = n >> 2; } else if (sample_size > 16) { for (i = 0; i < n; i += 3) { samples[i/3] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13) |(aifbuf[i + 2]<<5); } bufcount = n/3; } else if (sample_size > 8) { for (i = 0; i < n; i += 2) samples[i/2] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13); bufcount = n >> 1; } else { for (i = 0; i < n; i++) samples[i] = SE(aifbuf[i]) << 21; bufcount = n; } if (num_channels == 2) bufcount >>= 1; ci->pcmbuf_insert(samples, NULL, bufcount); ci->advance_buffer(n); bytesdone += n; if (bytesdone >= numbytes) endofstream = 1; ci->set_elapsed(bytesdone*1000LL/avgbytespersec); } i = CODEC_OK; done: if (ci->request_next_track()) goto next_track; exit: return i; }