diff options
Diffstat (limited to 'src/lib/audio_buffers.cc')
| -rw-r--r-- | src/lib/audio_buffers.cc | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/lib/audio_buffers.cc b/src/lib/audio_buffers.cc index a1c9b81ac..56ca7a94b 100644 --- a/src/lib/audio_buffers.cc +++ b/src/lib/audio_buffers.cc @@ -73,6 +73,9 @@ AudioBuffers::~AudioBuffers () void AudioBuffers::allocate (int channels, int frames) { + assert (frames >= 0); + assert (channels >= 0); + _channels = channels; _frames = frames; _allocated_frames = frames; @@ -172,6 +175,11 @@ AudioBuffers::make_silent (int from, int frames) void AudioBuffers::copy_from (AudioBuffers const * from, int frames_to_copy, int read_offset, int write_offset) { + if (frames_to_copy == 0) { + /* Prevent the asserts from firing if there is nothing to do */ + return; + } + assert (from->channels() == channels()); assert (from); @@ -255,6 +263,8 @@ void AudioBuffers::accumulate_frames (AudioBuffers const * from, int read_offset, int write_offset, int frames) { assert (_channels == from->channels ()); + assert (read_offset >= 0); + assert (write_offset >= 0); for (int i = 0; i < _channels; ++i) { for (int j = 0; j < frames; ++j) { @@ -275,3 +285,29 @@ AudioBuffers::apply_gain (float dB) } } } + +/** @param c Channel index. + * @return AudioBuffers object containing only channel `c' from this AudioBuffers. + */ +shared_ptr<AudioBuffers> +AudioBuffers::channel (int c) const +{ + shared_ptr<AudioBuffers> o (new AudioBuffers (1, frames ())); + o->copy_channel_from (this, c, 0); + return o; +} + +void +AudioBuffers::copy_channel_from (AudioBuffers const * from, int from_channel, int to_channel) +{ + assert (from->frames() == frames()); + memcpy (data(to_channel), from->data(from_channel), frames() * sizeof (float)); +} + +shared_ptr<AudioBuffers> +AudioBuffers::clone () const +{ + shared_ptr<AudioBuffers> b (new AudioBuffers (channels (), frames ())); + b->copy_from (this, frames (), 0, 0); + return b; +} |