238 lines
6.6 KiB
C
238 lines
6.6 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) 2002 Björn Stenberg
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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 "Tremor/ivorbisfile.h"
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#include "Tremor/ogg.h"
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CODEC_HEADER
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/* Some standard functions and variables needed by Tremor */
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size_t read_handler(void *ptr, size_t size, size_t nmemb, void *datasource)
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{
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(void)datasource;
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return ci->read_filebuf(ptr, nmemb*size);
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}
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int initial_seek_handler(void *datasource, ogg_int64_t offset, int whence)
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{
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(void)datasource;
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(void)offset;
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(void)whence;
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return -1;
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}
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int seek_handler(void *datasource, ogg_int64_t offset, int whence)
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{
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(void)datasource;
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if (whence == SEEK_CUR) {
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offset += ci->curpos;
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} else if (whence == SEEK_END) {
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offset += ci->filesize;
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}
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if (ci->seek_buffer(offset)) {
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return 0;
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}
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return -1;
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}
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int close_handler(void *datasource)
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{
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(void)datasource;
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return 0;
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}
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long tell_handler(void *datasource)
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{
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(void)datasource;
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return ci->curpos;
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}
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/* This sets the DSP parameters based on the current logical bitstream
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* (sampling rate, number of channels, etc). It also tries to guess
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* reasonable buffer parameters based on the current quality setting.
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*/
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bool vorbis_set_codec_parameters(OggVorbis_File *vf)
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{
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vorbis_info *vi;
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vi = ov_info(vf, -1);
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if (vi == NULL) {
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//ci->splash(HZ*2, "Vorbis Error");
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return false;
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}
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ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
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codec_set_replaygain(ci->id3);
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if (vi->channels == 2) {
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ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
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} else if (vi->channels == 1) {
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ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
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}
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return true;
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}
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/* this is the codec entry point */
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enum codec_status codec_main(void)
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{
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ov_callbacks callbacks;
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OggVorbis_File vf;
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ogg_int32_t **pcm;
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int error;
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long n;
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int current_section;
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int previous_section = -1;
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int eof;
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ogg_int64_t vf_offsets[2];
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ogg_int64_t vf_dataoffsets;
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ogg_uint32_t vf_serialnos;
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ogg_int64_t vf_pcmlengths[2];
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ci->configure(DSP_SET_SAMPLE_DEPTH, 24);
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/* Note: These are sane defaults for these values. Perhaps
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* they should be set differently based on quality setting
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*/
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/* We need to flush reserver memory every track load. */
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next_track:
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if (codec_init()) {
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error = CODEC_ERROR;
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goto exit;
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}
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ogg_malloc_init();
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while (!*ci->taginfo_ready && !ci->stop_codec)
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ci->sleep(1);
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/* Create a decoder instance */
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callbacks.read_func = read_handler;
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callbacks.seek_func = initial_seek_handler;
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callbacks.tell_func = tell_handler;
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callbacks.close_func = close_handler;
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/* Open a non-seekable stream */
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error = ov_open_callbacks(ci, &vf, NULL, 0, callbacks);
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/* If the non-seekable open was successful, we need to supply the missing
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* data to make it seekable. This is a hack, but it's reasonable since we
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* don't want to run the whole file through the buffer before we start
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* playing. Using Tremor's seekable open routine would cause us to do
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* this, so we pretend not to be seekable at first. Then we fill in the
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* missing fields of vf with 1) information in ci->id3, and 2) info
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* obtained by Tremor in the above ov_open call.
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*
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* Note that this assumes there is only ONE logical Vorbis bitstream in our
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* physical Ogg bitstream. This is verified in metadata.c, well before we
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* get here.
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*/
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if (!error) {
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vf.offsets = vf_offsets;
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vf.dataoffsets = &vf_dataoffsets;
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vf.serialnos = &vf_serialnos;
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vf.pcmlengths = vf_pcmlengths;
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vf.offsets[0] = 0;
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vf.offsets[1] = ci->id3->filesize;
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vf.dataoffsets[0] = vf.offset;
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vf.pcmlengths[0] = 0;
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vf.pcmlengths[1] = ci->id3->samples;
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vf.serialnos[0] = vf.current_serialno;
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vf.callbacks.seek_func = seek_handler;
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vf.seekable = 1;
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vf.end = ci->id3->filesize;
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vf.ready_state = OPENED;
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vf.links = 1;
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} else {
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//ci->logf("ov_open: %d", error);
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error = CODEC_ERROR;
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goto done;
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}
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if (ci->id3->offset) {
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ci->advance_buffer(ci->id3->offset);
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ov_raw_seek(&vf, ci->id3->offset);
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ci->set_elapsed(ov_time_tell(&vf));
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ci->set_offset(ov_raw_tell(&vf));
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}
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eof = 0;
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while (!eof) {
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ci->yield();
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if (ci->stop_codec || ci->new_track)
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break;
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if (ci->seek_time) {
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if (ov_time_seek(&vf, ci->seek_time - 1)) {
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//ci->logf("ov_time_seek failed");
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}
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ci->seek_complete();
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}
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/* Read host-endian signed 24-bit PCM samples */
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n = ov_read_fixed(&vf, &pcm, 1024, ¤t_section);
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/* Change DSP and buffer settings for this bitstream */
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if (current_section != previous_section) {
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if (!vorbis_set_codec_parameters(&vf)) {
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error = CODEC_ERROR;
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goto done;
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} else {
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previous_section = current_section;
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}
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}
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if (n == 0) {
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eof = 1;
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} else if (n < 0) {
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DEBUGF("Error decoding frame\n");
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} else {
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ci->pcmbuf_insert(pcm[0], pcm[1], n);
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ci->set_offset(ov_raw_tell(&vf));
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ci->set_elapsed(ov_time_tell(&vf));
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}
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}
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error = CODEC_OK;
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done:
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if (ci->request_next_track()) {
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/* Clean things up for the next track */
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vf.dataoffsets = NULL;
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vf.offsets = NULL;
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vf.serialnos = NULL;
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vf.pcmlengths = NULL;
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ov_clear(&vf);
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previous_section = -1;
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goto next_track;
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}
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exit:
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return error;
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}
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