/// <summary>
/// Constructs a new VideoDecoderStream over a specific filename.
/// </summary>
/// <param name="Filename">File to decode</param>
internal VideoDecoderStream(MediaFileReader file, ref AVStream stream)
: base(file, ref stream)
{
// allocate video frame
m_avFrame = FFmpeg.avcodec_alloc_frame();
if (FFmpeg.avpicture_alloc(out m_avPicture, m_avCodecCtx.pix_fmt, m_avCodecCtx.width, m_avCodecCtx.height) != 0)
throw new DecoderException("Error allocating AVPicture");
m_avPicture_allocated = true;
int buffersize = FFmpeg.avpicture_get_size(m_avCodecCtx.pix_fmt, m_avCodecCtx.width, m_avCodecCtx.height);
if (buffersize <= 0)
throw new DecoderException("Invalid size returned by avpicture_get_size");
m_buffer = new byte[buffersize];
}
public DecoderStream(MediaFile file, ref AVStream stream)
{
// Initialize instance variables
m_disposed = false;
m_position = m_bufferUsedSize = 0;
m_file = file;
m_avStream = stream;
m_avCodecCtx = *m_avStream.codec;
// Open the decoding codec
AVCodec* avCodec = FFmpeg.avcodec_find_decoder(m_avCodecCtx.codec_id);
if (avCodec == null)
throw new DecoderException("No decoder found");
if (FFmpeg.avcodec_open(ref m_avCodecCtx, avCodec) < 0)
throw new DecoderException("Error opening codec");
m_codecOpen = true;
}
public static extern void av_update_cur_dts(ref AVFormatContext pAVFormatContext, ref AVStream pAVStream, long timestamp);
public static extern void av_set_pts_info(ref AVStream pAVStream, int pts_wrap_bits, int pts_num, int pts_den);
public static extern AVError av_index_search_timestamp(ref AVStream pAVStream, long timestamp, AVSEEK_FLAG flags);
public static extern AVError av_add_index_entry(ref AVStream pAVStream, long pos, long timestamp, int size, int distance, AVSEEK_FLAG flags);
public static extern void av_pkt_dump2(IntPtr pFile, ref AVPacket pAVPacket, [MarshalAs(UnmanagedType.Bool)] bool dump_payload, ref AVStream stream);
internal AudioDecoderStream(MediaFile file, ref AVStream stream)
: base(file, ref stream)
{
m_buffer = new byte[FFmpeg.AVCODEC_MAX_AUDIO_FRAME_SIZE];
}
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);
}
