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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
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 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <iostream>
#include <sndfile.h>
#include "external_audio_decoder.h"
#include "film.h"
#include "exceptions.h"
#include "i18n.h"
using std::vector;
using std::string;
using std::stringstream;
using std::min;
using std::cout;
using boost::shared_ptr;
using boost::optional;
ExternalAudioDecoder::ExternalAudioDecoder (shared_ptr<Film> f, DecodeOptions o)
: Decoder (f, o)
, AudioDecoder (f, o)
{
sf_count_t frames;
vector<SNDFILE*> sf = open_files (frames);
close_files (sf);
}
vector<SNDFILE*>
ExternalAudioDecoder::open_files (sf_count_t & frames)
{
vector<string> const files = _film->external_audio ();
int N = 0;
for (size_t i = 0; i < files.size(); ++i) {
if (!files[i].empty()) {
N = i + 1;
}
}
if (N == 0) {
return vector<SNDFILE*> ();
}
bool first = true;
frames = 0;
vector<SNDFILE*> sndfiles;
for (size_t i = 0; i < (size_t) N; ++i) {
if (files[i].empty ()) {
sndfiles.push_back (0);
} else {
SF_INFO info;
SNDFILE* s = sf_open (files[i].c_str(), SFM_READ, &info);
if (!s) {
throw DecodeError (_("could not open external audio file for reading"));
}
if (info.channels != 1) {
throw DecodeError (_("external audio files must be mono"));
}
sndfiles.push_back (s);
if (first) {
shared_ptr<ExternalAudioStream> st (
new ExternalAudioStream (
info.samplerate, av_get_default_channel_layout (N)
)
);
_audio_streams.push_back (st);
_audio_stream = st;
frames = info.frames;
first = false;
} else {
if (info.frames != frames) {
throw DecodeError (_("external audio files have differing lengths"));
}
}
}
}
return sndfiles;
}
bool
ExternalAudioDecoder::pass ()
{
sf_count_t frames;
vector<SNDFILE*> sndfiles = open_files (frames);
if (sndfiles.empty()) {
return true;
}
/* Do things in half second blocks as I think there may be limits
to what FFmpeg (and in particular the resampler) can cope with.
*/
sf_count_t const block = _audio_stream->sample_rate() / 2;
shared_ptr<AudioBuffers> audio (new AudioBuffers (_audio_stream->channels(), block));
while (frames > 0) {
sf_count_t const this_time = min (block, frames);
for (size_t i = 0; i < sndfiles.size(); ++i) {
if (!sndfiles[i]) {
audio->make_silent (i);
} else {
sf_read_float (sndfiles[i], audio->data(i), block);
}
}
audio->set_frames (this_time);
Audio (audio);
frames -= this_time;
}
close_files (sndfiles);
return true;
}
void
ExternalAudioDecoder::close_files (vector<SNDFILE*> const & sndfiles)
{
for (size_t i = 0; i < sndfiles.size(); ++i) {
sf_close (sndfiles[i]);
}
}
shared_ptr<ExternalAudioStream>
ExternalAudioStream::create ()
{
return shared_ptr<ExternalAudioStream> (new ExternalAudioStream);
}
shared_ptr<ExternalAudioStream>
ExternalAudioStream::create (string t, optional<int> v)
{
if (!v) {
/* version < 1; no type in the string, and there's only FFmpeg streams anyway */
return shared_ptr<ExternalAudioStream> ();
}
stringstream s (t);
string type;
s >> type;
if (type != N_("external")) {
return shared_ptr<ExternalAudioStream> ();
}
return shared_ptr<ExternalAudioStream> (new ExternalAudioStream (t, v));
}
ExternalAudioStream::ExternalAudioStream (string t, optional<int> v)
{
assert (v);
stringstream s (t);
string type;
s >> type >> _sample_rate >> _channel_layout;
}
ExternalAudioStream::ExternalAudioStream ()
{
}
string
ExternalAudioStream::to_string () const
{
return String::compose (N_("external %1 %2"), _sample_rate, _channel_layout);
}
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