public static extern AVError av_read_play(ref AVFormatContext pAVFormatContext);
public static extern AVError av_seek_frame(ref AVFormatContext pAVFormatContext, int stream_index, long timestamp, AVSEEK_FLAG flags);
private static extern AVError av_open_input_stream(out AVFormatContext* ic_ptr, ref ByteIOContext pb,
string filename, ref AVInputFormat fmt, ref AVFormatParameters ap);
public static extern AVError avformat_find_stream_info(ref AVFormatContext pAVFormatContext, AVDictionary** options);
public static extern AVError av_write_header(ref AVFormatContext pAVFormatContext);
public static extern void dump_format(ref AVFormatContext pAVFormatContext, int index, string url, int is_output);
public static extern AVError av_find_stream_info(ref AVFormatContext pAVFormatContext);
public static extern void av_update_cur_dts(ref AVFormatContext pAVFormatContext, ref AVStream pAVStream, long timestamp);
public static extern void av_close_input_file(ref AVFormatContext pAVFormatContext);
public static extern AVError av_find_default_stream_index(ref AVFormatContext pAVFormatContext);
public static extern AVError avf_sdp_create(AVFormatContext** ac, int n_files, [In,Out]StringBuilder buff, int size);
public static unsafe void avformat_close_input(ref AVFormatContext s)
{
fixed (AVFormatContext* avc = &s)
{
IntPtr ptr = (IntPtr)avc;
avformat_close_input(ref ptr);
}
}
public static extern AVError avformat_write_header(ref AVFormatContext pAVFormatContext, AVDictionary** options);
public static extern AVError av_seek_frame_binary(ref AVFormatContext pAVFormatContext, int stream_index, long target_ts, AVSEEK_FLAG flags);
public static extern int av_interleave_packet_per_dts(ref AVFormatContext pAVFormatContext, ref AVPacket p_out_AVPacket,
ref AVPacket pAVPacket, [MarshalAs(UnmanagedType.Bool)]bool flush);
public static extern AVError av_set_parameters(ref AVFormatContext pAVFormatContext, AVFormatParameters* pAVFormatParameters);
public static extern AVStream* av_new_stream(ref AVFormatContext pAVFormatContext, int id);
public static extern int av_write_frame(ref AVFormatContext pAVFormatContext, ref AVPacket pAVPacket);
/// <summary>
/// Opens a media file as input. The codecs are not opened. Only the file
/// header (if present) is read.
/// </summary>
/// <param name="pFormatContext">the opened media file handle is put here</param>
/// <param name="filename">filename to open</param>
/// <returns>AVError</returns>
public static AVError av_open_input_file(out AVFormatContext pFormatContext, string filename)
{
IntPtr ptr;
AVError err = av_open_input_file(out ptr, filename, null, 0, null);
if (ptr == IntPtr.Zero)
{
pFormatContext = new AVFormatContext();
return err;
}
pFormatContext = *(AVFormatContext*)ptr.ToPointer();
FFmpeg.av_freep(ref ptr);
return err;
}
public static extern int av_write_trailer(ref AVFormatContext pAVFormatContext);
/// <summary>
/// Opens a media file as input. The codecs are not opened. Only the file
/// header (if present) is read.
/// </summary>
/// <param name="pFormatContext">the opened media file handle is put here</param>
/// <param name="filename">filename to open</param>
/// <param name="pAVInputFormat">if non null, force the file format to use</param>
/// <param name="buf_size">optional buffer size (zero as default is OK)</param>
/// <param name="pAVFormatParameters">Additional parameters needed when open the file (Null if default)</param>
/// <returns>AVError</returns>
public static AVError av_open_input_file(out AVFormatContext pFormatContext, string filename,
ref AVInputFormat fmt, int buf_size, ref AVFormatParameters ap)
{
IntPtr ptr;
AVError err = av_open_input_file(out ptr, filename, ref fmt, 0, ref ap);
if (ptr == IntPtr.Zero)
{
pFormatContext = new AVFormatContext();
return err;
}
pFormatContext = *(AVFormatContext*)ptr.ToPointer();
FFmpeg.av_freep(ref ptr);
return err;
}
public static extern void ffm_set_write_index(ref AVFormatContext pAVFormatContext, long pos, long file_size);
public static extern AVError av_read_packet(ref AVFormatContext pAVFormatContext, ref AVPacket pAVPacket);
/// <summary>
/// Allocates all the structures needed to read an input stream.
/// This does not open the needed codecs for decoding the stream[s].
/// </summary>
private static AVError av_open_input_stream(out AVFormatContext ctx, ref ByteIOContext pb,
string filename, ref AVInputFormat fmt, ref AVFormatParameters ap)
{
AVFormatContext* ptr;
AVError err = av_open_input_stream(out ptr, ref pb, filename, ref fmt, ref ap);
ctx = *ptr;
FFmpeg.av_free(ptr);
return err;
}
public AudioEncoderStream(string Filename, EncoderInformation EncoderInfo)
{
// Initialize instance variables
m_filename = Filename;
m_disposed = m_fileOpen = false;
m_buffer = new FifoMemoryStream();
// Open FFmpeg
FFmpeg.av_register_all();
// Initialize the output format context
m_avFormatCtx = FFmpeg.av_alloc_format_context();
// Get output format
m_avFormatCtx.oformat = FFmpeg.guess_format(EncoderInfo.Codec.ShortName, null, null);
if (m_avFormatCtx.oformat != null)
throw new EncoderException("Could not find output format.");
FFmpeg.av_set_parameters(ref m_avFormatCtx, null);
// Initialize the new output stream
AVStream* stream = FFmpeg.av_new_stream(ref m_avFormatCtx, 1);
if (stream == null)
throw new EncoderException("Could not alloc output audio stream");
m_avStream = *stream;
// Initialize output codec context
m_avCodecCtx = *m_avStream.codec;
m_avCodecCtx.codec_id = EncoderInfo.Codec.CodecID;
m_avCodecCtx.codec_type = CodecType.CODEC_TYPE_AUDIO;
m_avCodecCtx.sample_rate = EncoderInfo.SampleRate;
m_avCodecCtx.channels = EncoderInfo.Channels;
m_avCodecCtx.bits_per_sample = EncoderInfo.SampleSize;
m_avCodecCtx.bit_rate = EncoderInfo.Bitrate;
if (EncoderInfo.VBR)
{
m_avCodecCtx.flags |= FFmpeg.CODEC_FLAG_QSCALE;
m_avCodecCtx.global_quality = EncoderInfo.FFmpegQualityScale;
}
// Open codec
AVCodec* outCodec = FFmpeg.avcodec_find_encoder(m_avCodecCtx.codec_id);
if (outCodec == null)
throw new EncoderException("Could not find encoder");
if (FFmpeg.avcodec_open(ref m_avCodecCtx, outCodec) < 0)
throw new EncoderException("Could not open codec.");
// Open and prep file
if (FFmpeg.url_fopen(ref m_avFormatCtx.pb, m_filename, FFmpeg.URL_WRONLY) < 0)
throw new EncoderException("Could not open output file.");
m_fileOpen = true;
FFmpeg.av_write_header(ref m_avFormatCtx);
}
