// Detect type of input file and open it if recognized. Routine
// based on the av_open_input_file() libavformat function.
int ufile_fopen_input(AVFormatContext **ic_ptr, const wxString &name)
{
wxFileName f(name);
AVIOContext *pb = NULL;
int err;
// Open the file to prepare for probing
if ((err = ufile_fopen(&pb, name, AVIO_FLAG_READ)) < 0) {
goto fail;
}
*ic_ptr = avformat_alloc_context();
(*ic_ptr)->pb = pb;
// And finally, attempt to associate an input stream with the file
err = avformat_open_input(ic_ptr, OSINPUT(name), NULL, NULL);
if (err) {
goto fail;
}
return 0;
fail:
if (pb) {
ufile_close(pb);
}
*ic_ptr = NULL;
return err;
}
JSValueRef function_file_writer_close(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
size_t argc, const JSValueRef args[], JSValueRef *exception) {
if (argc == 1
&& JSValueGetType(ctx, args[0]) == kJSTypeString) {
char *descriptor = value_to_c_string(ctx, args[0]);
ufile_close(descriptor_str_to_int(descriptor));
free(descriptor);
}
return JSValueMakeNull(ctx);
}
FFmpegContext::~FFmpegContext()
{
if (FFmpegLibsInst()->ValidLibsLoaded())
{
if (ic_ptr)
avformat_close_input(&ic_ptr);
av_log_set_callback(av_log_default_callback);
}
if (pb) {
ufile_close(pb);
if (FFmpegLibsInst()->ValidLibsLoaded())
{
av_free(pb->buffer);
av_free(pb);
}
}
}
bool ExportFFmpeg::Finalize()
{
int i, nEncodedBytes;
// Flush the audio FIFO and encoder.
for (;;)
{
AVPacket pkt;
int nFifoBytes = av_fifo_size(mEncAudioFifo); // any bytes left in audio FIFO?
av_init_packet(&pkt);
nEncodedBytes = 0;
int nAudioFrameSizeOut = default_frame_size * mEncAudioCodecCtx->channels * sizeof(int16_t);
if (nAudioFrameSizeOut > mEncAudioFifoOutBufSiz || nFifoBytes > mEncAudioFifoOutBufSiz) {
wxMessageBox(wxString::Format(_("FFmpeg : ERROR - Too much remaining data.")),
_("FFmpeg Error"), wxOK|wxCENTER|wxICON_EXCLAMATION);
return false;
}
// Flush the audio FIFO first if necessary. It won't contain a _full_ audio frame because
// if it did we'd have pulled it from the FIFO during the last encodeAudioFrame() call -
// the encoder must support short/incomplete frames for this to work.
if (nFifoBytes > 0)
{
// Fill audio buffer with zeroes. If codec tries to read the whole buffer,
// it will just read silence. If not - who cares?
memset(mEncAudioFifoOutBuf,0,mEncAudioFifoOutBufSiz);
const AVCodec *codec = mEncAudioCodecCtx->codec;
// We have an incomplete buffer of samples left. Is it OK to encode it?
// If codec supports CODEC_CAP_SMALL_LAST_FRAME, we can feed it with smaller frame
// Or if codec is FLAC, feed it anyway (it doesn't have CODEC_CAP_SMALL_LAST_FRAME, but it works)
// Or if frame_size is 1, then it's some kind of PCM codec, they don't have frames and will be fine with the samples
// Or if user configured the exporter to pad with silence, then we'll send audio + silence as a frame.
if ((codec->capabilities & (CODEC_CAP_SMALL_LAST_FRAME|CODEC_CAP_VARIABLE_FRAME_SIZE))
|| mEncAudioCodecCtx->frame_size <= 1
|| gPrefs->Read(wxT("/FileFormats/OverrideSmallLastFrame"), true)
)
{
int frame_size = default_frame_size;
// The last frame is going to contain a smaller than usual number of samples.
// For codecs without CODEC_CAP_SMALL_LAST_FRAME use normal frame size
if (codec->capabilities & (CODEC_CAP_SMALL_LAST_FRAME|CODEC_CAP_VARIABLE_FRAME_SIZE))
frame_size = nFifoBytes / (mEncAudioCodecCtx->channels * sizeof(int16_t));
wxLogDebug(wxT("FFmpeg : Audio FIFO still contains %d bytes, writing %d sample frame ..."),
nFifoBytes, frame_size);
// Pull the bytes out from the FIFO and feed them to the encoder.
if (av_fifo_generic_read(mEncAudioFifo, mEncAudioFifoOutBuf, nFifoBytes, NULL) == 0)
{
nEncodedBytes = encode_audio(mEncAudioCodecCtx, &pkt, (int16_t*)mEncAudioFifoOutBuf, frame_size);
}
}
}
// Now flush the encoder.
if (nEncodedBytes <= 0)
nEncodedBytes = encode_audio(mEncAudioCodecCtx, &pkt, NULL, 0);
if (nEncodedBytes <= 0)
break;
pkt.stream_index = mEncAudioStream->index;
// Set presentation time of frame (currently in the codec's timebase) in the stream timebase.
if(pkt.pts != int64_t(AV_NOPTS_VALUE))
pkt.pts = av_rescale_q(pkt.pts, mEncAudioCodecCtx->time_base, mEncAudioStream->time_base);
if(pkt.dts != int64_t(AV_NOPTS_VALUE))
pkt.dts = av_rescale_q(pkt.dts, mEncAudioCodecCtx->time_base, mEncAudioStream->time_base);
if (av_interleaved_write_frame(mEncFormatCtx, &pkt) != 0)
{
wxMessageBox(wxString::Format(_("FFmpeg : ERROR - Couldn't write last audio frame to output file.")),
_("FFmpeg Error"), wxOK|wxCENTER|wxICON_EXCLAMATION);
break;
}
av_free_packet(&pkt);
}
// Write any file trailers.
av_write_trailer(mEncFormatCtx);
// Close the codecs.
if (mEncAudioStream != NULL)
avcodec_close(mEncAudioStream->codec);
for (i = 0; i < (int)mEncFormatCtx->nb_streams; i++)
{
av_freep(&mEncFormatCtx->streams[i]->codec);
av_freep(&mEncFormatCtx->streams[i]);
}
// Close the output file if we created it.
if (!(mEncFormatDesc->flags & AVFMT_NOFILE))
ufile_close(mEncFormatCtx->pb);
// Free any buffers or structures we allocated.
av_free(mEncFormatCtx);
av_freep(&mEncAudioFifoOutBuf);
mEncAudioFifoOutBufSiz = 0;
av_fifo_free(mEncAudioFifo);
mEncAudioFifo = NULL;
return true;
}