142 lines
4.5 KiB
C++
142 lines
4.5 KiB
C++
/* -*- c++ -*- */
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/*
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* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
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*
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* Copyright (C) 2017, Libre Space Foundation <http://librespacefoundation.org/>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gnuradio/io_signature.h>
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#include <vorbis/codec.h>
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#include <vorbis/vorbisfile.h>
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#include <volk/volk.h>
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#include <satnogs/log.h>
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#include "ogg_source_impl.h"
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#define PCM_BUF_SIZE 4096
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namespace gr {
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namespace satnogs {
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ogg_source::sptr
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ogg_source::make (const std::string& filename, size_t channels, bool repeat)
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{
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return gnuradio::get_initial_sptr (
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new ogg_source_impl (filename, channels, repeat));
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}
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/*
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* The private constructor
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*/
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ogg_source_impl::ogg_source_impl (const std::string& filename,
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size_t channels, bool repeat) :
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gr::sync_block (
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"ogg_source", gr::io_signature::make (0, 0, 0),
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gr::io_signature::make (channels, channels, sizeof(float))),
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d_channels (channels),
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d_repeat (repeat)
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{
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if (channels < 1) {
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throw std::invalid_argument ("At least one output channels should"
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" be specified");
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}
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if (ov_fopen (filename.c_str (), &d_ogvorb_f) < 0) {
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throw std::invalid_argument ("Invalid .ogg file");
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}
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vorbis_info *vi = ov_info (&d_ogvorb_f, -1);
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if (vi->channels != (int) channels) {
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throw std::invalid_argument (
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std::string ("Channels number specified (")
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+ std::to_string (channels)
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+ ") does not match the channels of "
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"the ogg stream (" + std::to_string (vi->channels) + ")");
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}
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const int alignment_multiple = volk_get_alignment () / sizeof(float);
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set_alignment (std::max (1, alignment_multiple));
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set_max_noutput_items (PCM_BUF_SIZE);
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d_in_buffer = (int16_t *) volk_malloc (PCM_BUF_SIZE * sizeof(int16_t),
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volk_get_alignment ());
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d_out_buffer = (float *) volk_malloc (PCM_BUF_SIZE * sizeof(float),
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volk_get_alignment ());
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if(!d_in_buffer || !d_out_buffer) {
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throw std::runtime_error("Could not allocate memory");
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}
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}
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/*
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* Our virtual destructor.
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*/
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ogg_source_impl::~ogg_source_impl()
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{
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ov_clear(&d_ogvorb_f);
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volk_free(d_in_buffer);
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volk_free(d_out_buffer);
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}
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int
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ogg_source_impl::work(int noutput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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{
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long int ret;
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int section = 0;
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int available = (noutput_items / d_channels);
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int produced = 0;
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ret = ov_read (&d_ogvorb_f, (char *)d_in_buffer,
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available * sizeof(int16_t),
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0, sizeof(int16_t), 1, §ion);
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if(ret < sizeof(int16_t)) {
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/*
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* If return value is EOF and the repeat mode is set seek back to the
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* start of the ogg stream
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*/
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if(ret == 0 && d_repeat) {
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if(ov_seekable(&d_ogvorb_f)){
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ov_time_seek(&d_ogvorb_f, 0);
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return 0;
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}
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LOG_WARN("File is not seakable.");
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}
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return WORK_DONE;
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}
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/* Convert to float the signed-short audio samples */
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volk_16i_s32f_convert_32f (d_out_buffer, d_in_buffer, 2 << 15,
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ret / sizeof(int16_t));
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/* De-interleave the available channels */
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for(int i = 0; i < ret / sizeof(int16_t); i += d_channels, produced++) {
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for(int chan = 0; chan < d_channels; chan++){
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((float *)output_items[chan])[produced] = d_out_buffer[i * d_channels + chan];
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}
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}
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return produced;
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}
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} /* namespace satnogs */
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} /* namespace gr */
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