public DecoderStream(MediaFile file, 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 int av_parser_change(ref AVCodecParserContext pAVCodecParserContext,
ref AVCodecContext pAVCodecContext,
ref byte[] poutbuf, ref int poutbuf_size,
byte[] buf, int buf_size, int keyframe);
public static extern int avcodec_thread_execute(ref AVCodecContext pAVCodecContext,
[MarshalAs(UnmanagedType.FunctionPtr)]FuncCallback func,
void** arg, ref int ret, int count);
public static extern int avcodec_thread_init(ref AVCodecContext pAVCodecContext, int thread_count);
public static extern int avcodec_open(ref AVCodecContext pAVCodecContext, AVCodec* pAVCodec);
public static extern void avcodec_set_dimensions(ref AVCodecContext pAVCodecContext, int width, int height);
public static extern int avcodec_decode_subtitle(ref AVCodecContext pAVCodecContext, ref AVSubtitle pAVSubtitle,
[MarshalAs(UnmanagedType.Bool)]out bool got_sub_ptr, byte[] buf, int buf_size);
public static extern void avcodec_flush_buffers(ref AVCodecContext pAVCodecContext);
public static extern int avcodec_decode_audio2(ref AVCodecContext avctx, [In, Out]short[] samples,
ref int frame_size_ptr, byte[] buf, int buf_size);
public static unsafe extern int avcodec_decode_audio2(ref AVCodecContext avctx, short* samples,
ref int frame_size_ptr, byte* buf, int buf_size);
public static extern int avcodec_close(ref AVCodecContext pAVCodecContext);
public static extern void avcodec_align_dimensions(ref AVCodecContext pAVCodecContext, ref int width, ref int height);
public static extern int avcodec_decode_video(ref AVCodecContext pAVCodecContext, AVFrame* pAVFrame,
[MarshalAs(UnmanagedType.Bool)]out bool got_picture_ptr,
byte* buf, int buf_size);
public static extern int avcodec_encode_subtitle(ref AVCodecContext pAVCodecContext, [In, Out]byte[] buf, int buf_size,
ref AVSubtitle pAVSubtitle);
public static extern int avcodec_decode_video2(ref AVCodecContext pAVCodecContext, AVFrame* pAVFrame,
[MarshalAs(UnmanagedType.Bool)]out bool got_picture_ptr,
ref AVPacket packet);
public static extern int avcodec_encode_video(ref AVCodecContext pAVCodecContext, [In, Out]byte[] buf, int buf_size,
ref AVFrame pAVFrame);
public static extern void avcodec_default_free_buffers(ref AVCodecContext pAVCodecContext);
public static extern void avcodec_get_context_defaults(ref AVCodecContext pAVCodecContext);
public static extern int avcodec_default_get_buffer(ref AVCodecContext pAVCodecContext, ref AVFrame pAVFrame);
public static extern int avcodec_parse_frame(ref AVCodecContext pAVCodecContext,
ref byte[] pdata,
ref int data_size_ptr, byte[] buf, int buf_size);
public static extern PixelFormat avcodec_default_get_format(ref AVCodecContext pAVCodecContext, ref PixelFormat fmt);
public static extern void avcodec_string(string name, int buf_size,
ref AVCodecContext pAVCodeContext, int encode);
public static extern void avcodec_default_release_buffer(ref AVCodecContext pAVCodecContext, ref AVFrame pAVFrame);
public static extern void avcodec_thread_free(ref AVCodecContext pAVCodecContext);
public static extern int avcodec_encode_audio(ref AVCodecContext pAVCodecContext, [In, Out]byte[] buf, int buf_size,
short[] samples);
public static extern int av_bitstream_filter_filter(ref AVBitStreamFilterContext pAVBitStreamFilterContext,
ref AVCodecContext pAVCodecContext,
string args,
ref byte[] poutbuf,
ref int poutbuf_size, byte[] buf, int buf_size, int keyframe);
public static extern int avcodec_encode_audio(ref AVCodecContext pAVCodecContext, byte* buf, int buf_size, short* samples);
public static extern int av_parser_parse(ref AVCodecParserContext pAVCodecParserContext,
ref AVCodecContext pAVCodecContext,
ref byte[] poutbuf, ref int poutbuf_size,
byte[] buf, int buf_size, long pts, long dts);
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);
}
