From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001 From: Sean Bartell Date: Sat, 25 Jun 2011 21:32:25 -0400 Subject: Add codecs to librbcodec. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius Tested-by: Nils Wallménius --- lib/rbcodec/codecs/au.c | 314 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 314 insertions(+) create mode 100644 lib/rbcodec/codecs/au.c (limited to 'lib/rbcodec/codecs/au.c') diff --git a/lib/rbcodec/codecs/au.c b/lib/rbcodec/codecs/au.c new file mode 100644 index 0000000000..cb75c7423d --- /dev/null +++ b/lib/rbcodec/codecs/au.c @@ -0,0 +1,314 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2010 Yoshihisa Uchida + * + * 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 "codecs/libpcm/support_formats.h" + +CODEC_HEADER + +/* Sun Audio file (Au file format) codec + * + * References + * [1] Sun Microsystems, Inc., Header file for Audio, .au, 1992 + * URL http://www.opengroup.org/public/pubs/external/auformat.html + * [2] Wikipedia, Au file format, URL: http://en.wikipedia.org/wiki/Sun_Audio + */ + +#define PCM_SAMPLE_SIZE (1024*2) + +static int32_t samples[PCM_SAMPLE_SIZE] IBSS_ATTR; + +enum +{ + AU_FORMAT_UNSUPPORT = 0, /* unsupported format */ + AU_FORMAT_MULAW, /* G.711 MULAW */ + AU_FORMAT_PCM, /* Linear PCM */ + AU_FORMAT_IEEE_FLOAT, /* IEEE float */ + AU_FORMAT_ALAW, /* G.711 ALAW */ +}; + +static const char support_formats[9][2] = { + { AU_FORMAT_UNSUPPORT, 0 }, /* encoding */ + { AU_FORMAT_MULAW, 8 }, /* 1: G.711 MULAW */ + { AU_FORMAT_PCM, 8 }, /* 2: Linear PCM 8bit (signed) */ + { AU_FORMAT_PCM, 16 }, /* 3: Linear PCM 16bit (signed, big endian) */ + { AU_FORMAT_PCM, 24 }, /* 4: Linear PCM 24bit (signed, big endian) */ + { AU_FORMAT_PCM, 32 }, /* 5: Linear PCM 32bit (signed, big endian) */ + { AU_FORMAT_IEEE_FLOAT, 32 }, /* 6: Linear PCM float 32bit (signed, big endian) */ + { AU_FORMAT_IEEE_FLOAT, 64 }, /* 7: Linear PCM float 64bit (signed, big endian) */ + /* encoding 8 - 26 unsupported. */ + { AU_FORMAT_ALAW, 8 }, /* 27: G.711 ALAW */ +}; + +static const struct pcm_entry au_codecs[] = { + { AU_FORMAT_MULAW, get_itut_g711_mulaw_codec }, + { AU_FORMAT_PCM, get_linear_pcm_codec }, + { AU_FORMAT_IEEE_FLOAT, get_ieee_float_codec }, + { AU_FORMAT_ALAW, get_itut_g711_alaw_codec }, +}; + +#define NUM_FORMATS 4 + +static const struct pcm_codec *get_au_codec(uint32_t formattag) +{ + int i; + + for (i = 0; i < NUM_FORMATS; i++) + { + if (au_codecs[i].format_tag == formattag) + { + if (au_codecs[i].get_codec) + return au_codecs[i].get_codec(); + return 0; + } + } + return 0; +} + +static unsigned int get_be32(uint8_t *buf) +{ + return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]; +} + +static int convert_au_format(unsigned int encoding, struct pcm_format *fmt) +{ + fmt->formattag = AU_FORMAT_UNSUPPORT; + if (encoding < 8) + { + fmt->formattag = support_formats[encoding][0]; + fmt->bitspersample = support_formats[encoding][1]; + } + else if (encoding == 27) + { + fmt->formattag = support_formats[8][0]; + fmt->bitspersample = support_formats[8][1]; + } + + return fmt->formattag; +} + +/* this is the codec entry point */ +enum codec_status codec_main(enum codec_entry_call_reason reason) +{ + if (reason == CODEC_LOAD) { + /* Generic codec initialisation */ + ci->configure(DSP_SET_SAMPLE_DEPTH, PCM_OUTPUT_DEPTH-1); + } + + return CODEC_OK; +} + +/* this is called for each file to process */ +enum codec_status codec_run(void) +{ + struct pcm_format format; + uint32_t bytesdone, decodedsamples; + size_t n; + int bufcount; + int endofstream; + unsigned char *buf; + uint8_t *aubuf; + off_t firstblockposn; /* position of the first block in file */ + const struct pcm_codec *codec; + int offset = 0; + intptr_t param; + + if (codec_init()) { + DEBUGF("codec_init() error\n"); + return CODEC_ERROR; + } + + codec_set_replaygain(ci->id3); + + /* Need to save offset for later use (cleared indirectly by advance_buffer) */ + bytesdone = ci->id3->offset; + + ci->memset(&format, 0, sizeof(struct pcm_format)); + format.is_signed = true; + format.is_little_endian = false; + + /* set format */ + ci->seek_buffer(0); + buf = ci->request_buffer(&n, 24); + if (n < 24 || (memcmp(buf, ".snd", 4) != 0)) + { + /* + * headerless sun audio file + * It is decoded under conditions. + * format: G.711 mu-law + * channel: mono + * frequency: 8000 kHz + */ + offset = 0; + format.formattag = AU_FORMAT_MULAW; + format.channels = 1; + format.bitspersample = 8; + format.numbytes = ci->id3->filesize; + } + else + { + /* parse header */ + + /* data offset */ + offset = get_be32(buf + 4); + if (offset < 24) + { + DEBUGF("CODEC_ERROR: sun audio offset size is small: %d\n", offset); + return CODEC_ERROR; + } + /* data size */ + format.numbytes = get_be32(buf + 8); + if (format.numbytes == (uint32_t)0xffffffff) + format.numbytes = ci->id3->filesize - offset; + /* encoding */ + format.formattag = convert_au_format(get_be32(buf + 12), &format); + if (format.formattag == AU_FORMAT_UNSUPPORT) + { + DEBUGF("CODEC_ERROR: sun audio unsupport format: %d\n", get_be32(buf + 12)); + return CODEC_ERROR; + } + /* skip sample rate */ + format.channels = get_be32(buf + 20); + } + + /* advance to first WAVE chunk */ + ci->advance_buffer(offset); + + firstblockposn = offset; + + decodedsamples = 0; + codec = 0; + + /* get codec */ + codec = get_au_codec(format.formattag); + if (!codec) + { + DEBUGF("CODEC_ERROR: unsupport sun audio format: %x\n", (int)format.formattag); + return CODEC_ERROR; + } + + if (!codec->set_format(&format)) + { + return CODEC_ERROR; + } + + if (format.numbytes == 0) { + DEBUGF("CODEC_ERROR: data size is 0\n"); + return CODEC_ERROR; + } + + /* check chunksize */ + if ((format.chunksize / format.blockalign) * format.samplesperblock * format.channels + > PCM_SAMPLE_SIZE) + format.chunksize = (PCM_SAMPLE_SIZE / format.blockalign) * format.blockalign; + if (format.chunksize == 0) + { + DEBUGF("CODEC_ERROR: chunksize is 0\n"); + return CODEC_ERROR; + } + + ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency); + if (format.channels == 2) { + ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED); + } else if (format.channels == 1) { + ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO); + } else { + DEBUGF("CODEC_ERROR: more than 2 channels\n"); + return CODEC_ERROR; + } + + /* make sure we're at the correct offset */ + if (bytesdone > (uint32_t) firstblockposn) { + /* Round down to previous block */ + struct pcm_pos *newpos = codec->get_seek_pos(bytesdone - firstblockposn, + PCM_SEEK_POS, NULL); + + if (newpos->pos > format.numbytes) + goto done; + if (ci->seek_buffer(firstblockposn + newpos->pos)) + { + bytesdone = newpos->pos; + decodedsamples = newpos->samples; + } + } else { + /* already where we need to be */ + bytesdone = 0; + } + + ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency); + + /* The main decoder loop */ + endofstream = 0; + + while (!endofstream) { + enum codec_command_action action = ci->get_command(¶m); + + if (action == CODEC_ACTION_HALT) + break; + + if (action == CODEC_ACTION_SEEK_TIME) { + /* 3rd args(read_buffer) is unnecessary in the format which Sun Audio supports. */ + struct pcm_pos *newpos = codec->get_seek_pos(param, PCM_SEEK_TIME, NULL); + + if (newpos->pos > format.numbytes) + { + ci->set_elapsed(ci->id3->length); + ci->seek_complete(); + break; + } + + if (ci->seek_buffer(firstblockposn + newpos->pos)) + { + bytesdone = newpos->pos; + decodedsamples = newpos->samples; + } + + ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency); + ci->seek_complete(); + } + + aubuf = (uint8_t *)ci->request_buffer(&n, format.chunksize); + if (n == 0) + break; /* End of stream */ + if (bytesdone + n > format.numbytes) { + n = format.numbytes - bytesdone; + endofstream = 1; + } + + if (codec->decode(aubuf, n, samples, &bufcount) == CODEC_ERROR) + { + DEBUGF("codec error\n"); + return CODEC_ERROR; + } + + ci->pcmbuf_insert(samples, NULL, bufcount); + ci->advance_buffer(n); + bytesdone += n; + decodedsamples += bufcount; + + if (bytesdone >= format.numbytes) + endofstream = 1; + ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency); + } + +done: + return CODEC_OK; +} -- cgit v1.2.3