spx.h

   1 /*
   2  * Copyright (C) 2010-2013 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /**
   8  *  \file spx.h Structures and prototypes common to the speex audio format
   9  *  handler and the speex decoder.
  10  */
  11
  12 /**
  13  * Information extracted from the first ogg packet.
  14  *
  15  * It contains tech data but not the content of the attached comment tags.
  16  */
  17 struct spx_header_info {
  18         /** Holds the state of the decoder. */
  19         void *state;
  20         /** Extracted from header. */
  21         int frame_size;
  22         /** Current sample rate in Hz. */
  23         spx_int32_t sample_rate;
  24         /** Current bitrate used by the decoder. */
  25         int bitrate;
  26         /** Number of frames per packet, extracted from header. */
  27         int nframes;
  28         /** The number of channels of the current stream. */
  29         int channels;
  30         /** Only needed for stereo streams. */
  31         SpeexStereoState stereo;
  32         /** Must be skipped during decode. */
  33         int extra_headers;
  34         /** Narrow/wide/ultrawide band, bitstream version. */
  35         const SpeexMode *mode;
  36 };
  37
  38 int spx_process_header(unsigned char *packet, long bytes,
  39                 struct spx_header_info *shi);