Move all sources to src/

1 files changed, 177 insertions, 0 deletions

diff --git a/src/faad_decoder.cpp b/src/faad_decoder.cpp
new file mode 100644
index 0000000..73ea374
--- /dev/null
+++ b/src/faad_decoder.cpp
@@ -0,0 +1,177 @@
+/*
+    Copyright (C) 2014 Matthias P. Braendli (http://www.opendigitalradio.org)
+
+    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 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+    faad_decoder.cpp
+        Use libfaad to decode the AAC content of the DAB+ subchannel
+
+    Authors:
+         Matthias P. Braendli <matthias@mpb.li>
+*/
+
+#include "faad_decoder.hpp"
+extern "C" {
+#include "wavfile.h"
+}
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <cassert>
+#include <string>
+#include <sstream>
+#include <vector>
+
+using namespace std;
+
+FaadDecoder::FaadDecoder() :
+    m_data_len(0),
+    m_fd(NULL),
+    m_initialised(false)
+{
+}
+
+void FaadDecoder::open(string filename, bool ps_flag, bool aac_channel_mode,
+        bool dac_rate, bool sbr_flag, int mpeg_surround_config)
+{
+    m_filename             = filename;
+    m_ps_flag              = ps_flag;
+    m_aac_channel_mode     = aac_channel_mode;
+    m_dac_rate             = dac_rate;
+    m_sbr_flag             = sbr_flag;
+    m_mpeg_surround_config = mpeg_surround_config;
+}
+
+bool FaadDecoder::decode(vector<vector<uint8_t> > aus)
+{
+    for (size_t au_ix = 0; au_ix < aus.size(); au_ix++) {
+
+        vector<uint8_t>& au = aus[au_ix];
+
+        NeAACDecFrameInfo hInfo;
+        int16_t* outBuffer;
+
+        if (!m_initialised) {
+            /* AudioSpecificConfig structure (the only way to select 960 transform here!)
+             *
+             *  00010 = AudioObjectType 2 (AAC LC)
+             *  xxxx  = (core) sample rate index
+             *  xxxx  = (core) channel config
+             *  100   = GASpecificConfig with 960 transform
+             *
+             * SBR: implicit signaling sufficient - libfaad2 automatically assumes SBR on sample rates <= 24 kHz
+             * => explicit signaling works, too, but is not necessary here
+             *
+             * PS:  implicit signaling sufficient - libfaad2 therefore always uses stereo output (if PS support was enabled)
+             * => explicit signaling not possible, as libfaad2 does not support AudioObjectType 29 (PS)
+             */
+
+            int core_sr_index = m_dac_rate ? (m_sbr_flag ? 6 : 3) : (m_sbr_flag ? 8 : 5);   // 24/48/16/32 kHz
+            int core_ch_config = get_aac_channel_configuration();
+            if(core_ch_config == -1) {
+                printf("Unrecognized mpeg surround config (ignored): %d\n", m_mpeg_surround_config);
+                return false;
+            }
+
+            uint8_t asc[2];
+            asc[0] = 0b00010 << 3 | core_sr_index >> 1;
+            asc[1] = (core_sr_index & 0x01) << 7 | core_ch_config << 3 | 0b100;
+
+
+            long unsigned samplerate;
+            unsigned char channels;
+
+            long int init_result = NeAACDecInit2(m_faad_handle.decoder, asc, sizeof(asc), &samplerate, &channels);
+            if(init_result != 0) {
+                /* If some error initializing occured, skip the file */
+                printf("Error initializing decoder library: %s\n", NeAACDecGetErrorMessage(-init_result));
+                NeAACDecClose(m_faad_handle.decoder);
+                return false;
+            }
+
+            m_initialised = true;
+        }
+
+        outBuffer = (int16_t *)NeAACDecDecode(m_faad_handle.decoder, &hInfo, &au[0], au.size());
+        assert(outBuffer != NULL);
+
+        m_sample_rate = hInfo.samplerate;
+        m_channels    = hInfo.channels;
+        size_t samples  = hInfo.samples;
+
+#if 0
+        printf("bytes consumed %d\n", (int)(hInfo.bytesconsumed));
+        printf("samplerate = %d, samples = %zu, channels = %d,"
+                " error = %d, sbr = %d\n", m_sample_rate, samples,
+                m_channels, hInfo.error, hInfo.sbr);
+        printf("header = %d\n", hInfo.header_type);
+#endif
+
+        if (hInfo.error != 0) {
+            printf("FAAD Warning: %s\n",
+                    faacDecGetErrorMessage(hInfo.error));
+            return false;
+        }
+
+        if (m_fd == NULL) {
+            stringstream ss;
+            ss << m_filename << ".wav";
+            m_fd = wavfile_open(ss.str().c_str(), m_sample_rate);
+        }
+
+        if (samples) {
+            if (m_channels == 1) {
+                int16_t *buffer = (int16_t *)alloca (2 * samples);
+                size_t i;
+                for (i = 0; i < samples; i ++) {
+                    buffer [2 * i]  = ((int16_t *)outBuffer) [i];
+                    buffer [2 * i + 1] = buffer [2 * i];
+                }
+                wavfile_write(m_fd, buffer, 2*samples);
+            }
+            else if (m_channels == 2) {
+                wavfile_write(m_fd, outBuffer, samples);
+            }
+            else {
+                printf("Cannot handle %d channels\n", m_channels);
+            }
+        }
+
+    }
+    return true;
+}
+
+void FaadDecoder::close()
+{
+    if (m_initialised) {
+        wavfile_close(m_fd);
+    }
+}
+
+int FaadDecoder::get_aac_channel_configuration()
+{
+    switch(m_mpeg_surround_config) {
+    case 0:     // no surround
+        return m_aac_channel_mode ? 2 : 1;
+    case 1:     // 5.1
+        return 6;
+    case 2:     // 7.1
+        return 7;
+    default:
+        return -1;
+    }
+}
+
+