326 lines
9.6 KiB
C
326 lines
9.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2010 Yoshihisa Uchida
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "codeclib.h"
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#include "codecs/libpcm/support_formats.h"
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CODEC_HEADER
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/* Sun Audio file (Au file format) codec
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*
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* References
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* [1] Sun Microsystems, Inc., Header file for Audio, .au, 1992
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* URL http://www.opengroup.org/public/pubs/external/auformat.html
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* [2] Wikipedia, Au file format, URL: http://en.wikipedia.org/wiki/Sun_Audio
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*/
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#define PCM_SAMPLE_SIZE (1024*2)
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static int32_t samples[PCM_SAMPLE_SIZE] IBSS_ATTR;
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enum
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{
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AU_FORMAT_UNSUPPORT = 0, /* unsupported format */
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AU_FORMAT_MULAW, /* G.711 MULAW */
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AU_FORMAT_PCM, /* Linear PCM */
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AU_FORMAT_IEEE_FLOAT, /* IEEE float */
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AU_FORMAT_ALAW, /* G.711 ALAW */
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};
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static const char support_formats[9][2] = {
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{ AU_FORMAT_UNSUPPORT, 0 }, /* encoding */
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{ AU_FORMAT_MULAW, 8 }, /* 1: G.711 MULAW */
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{ AU_FORMAT_PCM, 8 }, /* 2: Linear PCM 8bit (signed) */
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{ AU_FORMAT_PCM, 16 }, /* 3: Linear PCM 16bit (signed, big endian) */
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{ AU_FORMAT_PCM, 24 }, /* 4: Linear PCM 24bit (signed, big endian) */
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{ AU_FORMAT_PCM, 32 }, /* 5: Linear PCM 32bit (signed, big endian) */
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{ AU_FORMAT_IEEE_FLOAT, 32 }, /* 6: Linear PCM float 32bit (signed, big endian) */
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{ AU_FORMAT_IEEE_FLOAT, 64 }, /* 7: Linear PCM float 64bit (signed, big endian) */
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/* encoding 8 - 26 unsupported. */
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{ AU_FORMAT_ALAW, 8 }, /* 27: G.711 ALAW */
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};
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static const struct pcm_entry au_codecs[] = {
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{ AU_FORMAT_MULAW, get_itut_g711_mulaw_codec },
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{ AU_FORMAT_PCM, get_linear_pcm_codec },
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{ AU_FORMAT_IEEE_FLOAT, get_ieee_float_codec },
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{ AU_FORMAT_ALAW, get_itut_g711_alaw_codec },
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};
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#define NUM_FORMATS 4
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static const struct pcm_codec *get_au_codec(uint32_t formattag)
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{
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int i;
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for (i = 0; i < NUM_FORMATS; i++)
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{
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if (au_codecs[i].format_tag == formattag)
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{
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if (au_codecs[i].get_codec)
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return au_codecs[i].get_codec();
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return 0;
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}
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}
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return 0;
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}
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static unsigned int get_be32(uint8_t *buf)
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{
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return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
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}
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static int convert_au_format(unsigned int encoding, struct pcm_format *fmt)
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{
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fmt->formattag = AU_FORMAT_UNSUPPORT;
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if (encoding < 8)
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{
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fmt->formattag = support_formats[encoding][0];
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fmt->bitspersample = support_formats[encoding][1];
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}
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else if (encoding == 27)
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{
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fmt->formattag = support_formats[8][0];
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fmt->bitspersample = support_formats[8][1];
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}
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return fmt->formattag;
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}
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/* this is the codec entry point */
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enum codec_status codec_main(enum codec_entry_call_reason reason)
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{
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if (reason == CODEC_LOAD) {
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/* Generic codec initialisation */
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ci->configure(DSP_SET_SAMPLE_DEPTH, PCM_OUTPUT_DEPTH-1);
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}
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return CODEC_OK;
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}
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/* this is called for each file to process */
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enum codec_status codec_run(void)
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{
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struct pcm_format format;
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uint32_t bytesdone, decodedsamples;
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size_t n;
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int bufcount;
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int endofstream;
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unsigned char *buf;
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uint8_t *aubuf;
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off_t firstblockposn; /* position of the first block in file */
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const struct pcm_codec *codec;
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int offset = 0;
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intptr_t param;
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if (codec_init()) {
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DEBUGF("codec_init() error\n");
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return CODEC_ERROR;
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}
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codec_set_replaygain(ci->id3);
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/* Need to save offset for later use (cleared indirectly by advance_buffer) */
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param = ci->id3->elapsed;
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bytesdone = ci->id3->offset;
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ci->memset(&format, 0, sizeof(struct pcm_format));
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format.is_signed = true;
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format.is_little_endian = false;
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/* set format */
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ci->seek_buffer(0);
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buf = ci->request_buffer(&n, 24);
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if (n < 24 || (memcmp(buf, ".snd", 4) != 0))
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{
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/*
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* headerless sun audio file
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* It is decoded under conditions.
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* format: G.711 mu-law
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* channel: mono
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* frequency: 8000 kHz
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*/
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offset = 0;
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format.formattag = AU_FORMAT_MULAW;
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format.channels = 1;
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format.bitspersample = 8;
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format.numbytes = ci->id3->filesize;
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}
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else
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{
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/* parse header */
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/* data offset */
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offset = get_be32(buf + 4);
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if (offset < 24)
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{
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DEBUGF("CODEC_ERROR: sun audio offset size is small: %d\n", offset);
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return CODEC_ERROR;
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}
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/* data size */
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format.numbytes = get_be32(buf + 8);
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if (format.numbytes == (uint32_t)0xffffffff)
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format.numbytes = ci->id3->filesize - offset;
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/* encoding */
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format.formattag = convert_au_format(get_be32(buf + 12), &format);
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if (format.formattag == AU_FORMAT_UNSUPPORT)
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{
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DEBUGF("CODEC_ERROR: sun audio unsupport format: %d\n", get_be32(buf + 12));
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return CODEC_ERROR;
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}
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/* skip sample rate */
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format.channels = get_be32(buf + 20);
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}
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/* advance to first WAVE chunk */
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ci->advance_buffer(offset);
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firstblockposn = offset;
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decodedsamples = 0;
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codec = 0;
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/* get codec */
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codec = get_au_codec(format.formattag);
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if (!codec)
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{
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DEBUGF("CODEC_ERROR: unsupport sun audio format: %x\n", (int)format.formattag);
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return CODEC_ERROR;
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}
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if (!codec->set_format(&format))
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{
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return CODEC_ERROR;
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}
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if (format.numbytes == 0) {
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DEBUGF("CODEC_ERROR: data size is 0\n");
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return CODEC_ERROR;
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}
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/* check chunksize */
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if ((format.chunksize / format.blockalign) * format.samplesperblock * format.channels
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> PCM_SAMPLE_SIZE)
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format.chunksize = (PCM_SAMPLE_SIZE / format.blockalign) * format.blockalign;
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if (format.chunksize == 0)
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{
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DEBUGF("CODEC_ERROR: chunksize is 0\n");
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return CODEC_ERROR;
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}
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ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
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if (format.channels == 2) {
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ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
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} else if (format.channels == 1) {
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ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
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} else {
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DEBUGF("CODEC_ERROR: more than 2 channels\n");
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return CODEC_ERROR;
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}
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/* make sure we're at the correct offset */
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if (bytesdone > (uint32_t) firstblockposn || param) {
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uint32_t seek_val;
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int seek_mode;
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if (bytesdone) {
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seek_val = bytesdone - MIN((uint32_t) firstblockposn, bytesdone);
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seek_mode = PCM_SEEK_POS;
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} else {
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seek_val = param;
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seek_mode = PCM_SEEK_TIME;
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}
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/* Round down to previous block */
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struct pcm_pos *newpos = codec->get_seek_pos(seek_val, seek_mode, NULL);
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if (newpos->pos > format.numbytes)
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goto done;
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if (ci->seek_buffer(firstblockposn + newpos->pos))
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{
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bytesdone = newpos->pos;
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decodedsamples = newpos->samples;
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}
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} else {
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/* already where we need to be */
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bytesdone = 0;
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}
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ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency);
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/* The main decoder loop */
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endofstream = 0;
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while (!endofstream) {
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enum codec_command_action action = ci->get_command(¶m);
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if (action == CODEC_ACTION_HALT)
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break;
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if (action == CODEC_ACTION_SEEK_TIME) {
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/* 3rd args(read_buffer) is unnecessary in the format which Sun Audio supports. */
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struct pcm_pos *newpos = codec->get_seek_pos(param, PCM_SEEK_TIME, NULL);
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if (newpos->pos > format.numbytes)
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{
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ci->set_elapsed(ci->id3->length);
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ci->seek_complete();
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break;
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}
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if (ci->seek_buffer(firstblockposn + newpos->pos))
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{
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bytesdone = newpos->pos;
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decodedsamples = newpos->samples;
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}
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ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency);
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ci->seek_complete();
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}
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aubuf = (uint8_t *)ci->request_buffer(&n, format.chunksize);
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if (n == 0)
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break; /* End of stream */
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if (bytesdone + n > format.numbytes) {
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n = format.numbytes - bytesdone;
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endofstream = 1;
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}
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if (codec->decode(aubuf, n, samples, &bufcount) == CODEC_ERROR)
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{
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DEBUGF("codec error\n");
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return CODEC_ERROR;
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}
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ci->pcmbuf_insert(samples, NULL, bufcount);
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ci->advance_buffer(n);
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bytesdone += n;
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decodedsamples += bufcount;
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if (bytesdone >= format.numbytes)
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endofstream = 1;
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ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency);
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}
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done:
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return CODEC_OK;
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}
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