src/opus_private.h

/* Copyright (c) 2012 Xiph.Org Foundation
   Written by Jean-Marc Valin */
/*
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


#ifndef OPUS_PRIVATE_H
#define OPUS_PRIVATE_H

#include "arch.h"
#include "opus.h"
#include "celt.h"

#include <stdarg.h> /* va_list */
#include <stddef.h> /* offsetof */

struct OpusRepacketizer {
   unsigned char toc;
   int nb_frames;
   const unsigned char *frames[48];
   opus_int16 len[48];
   int framesize;
};

typedef struct ChannelLayout {
   int nb_channels;
   int nb_streams;
   int nb_coupled_streams;
   unsigned char mapping[256];
} ChannelLayout;

typedef enum {
  MAPPING_TYPE_NONE,
  MAPPING_TYPE_SURROUND,
  MAPPING_TYPE_AMBISONICS
} MappingType;

struct OpusMSEncoder {
   ChannelLayout layout;
   int arch;
   int lfe_stream;
   int application;
   int variable_duration;
   MappingType mapping_type;
   opus_int32 bitrate_bps;
   /* Encoder states go here */
   /* then opus_val32 window_mem[channels*120]; */
   /* then opus_val32 preemph_mem[channels]; */
};

struct OpusMSDecoder {
   ChannelLayout layout;
   /* Decoder states go here */
};

int opus_multistream_encoder_ctl_va_list(struct OpusMSEncoder *st, int request,
  va_list ap);
int opus_multistream_decoder_ctl_va_list(struct OpusMSDecoder *st, int request,
  va_list ap);

int validate_layout(const ChannelLayout *layout);
int get_left_channel(const ChannelLayout *layout, int stream_id, int prev);
int get_right_channel(const ChannelLayout *layout, int stream_id, int prev);
int get_mono_channel(const ChannelLayout *layout, int stream_id, int prev);

typedef void (*opus_copy_channel_in_func)(
  opus_val16 *dst,
  int dst_stride,
  const void *src,
  int src_stride,
  int src_channel,
  int frame_size,
  void *user_data
);

typedef void (*opus_copy_channel_out_func)(
  void *dst,
  int dst_stride,
  int dst_channel,
  const opus_val16 *src,
  int src_stride,
  int frame_size,
  void *user_data
);

#define MODE_SILK_ONLY          1000
#define MODE_HYBRID             1001
#define MODE_CELT_ONLY          1002

#define OPUS_SET_VOICE_RATIO_REQUEST         11018
#define OPUS_GET_VOICE_RATIO_REQUEST         11019

/** Configures the encoder's expected percentage of voice
  * opposed to music or other signals.
  *
  * @note This interface is currently more aspiration than actuality. It's
  * ultimately expected to bias an automatic signal classifier, but it currently
  * just shifts the static bitrate to mode mapping around a little bit.
  *
  * @param[in] x <tt>int</tt>:   Voice percentage in the range 0-100, inclusive.
  * @hideinitializer */
#define OPUS_SET_VOICE_RATIO(x) OPUS_SET_VOICE_RATIO_REQUEST, __opus_check_int(x)
/** Gets the encoder's configured voice ratio value, @see OPUS_SET_VOICE_RATIO
  *
  * @param[out] x <tt>int*</tt>:  Voice percentage in the range 0-100, inclusive.
  * @hideinitializer */
#define OPUS_GET_VOICE_RATIO(x) OPUS_GET_VOICE_RATIO_REQUEST, __opus_check_int_ptr(x)


#define OPUS_SET_FORCE_MODE_REQUEST    11002
#define OPUS_SET_FORCE_MODE(x) OPUS_SET_FORCE_MODE_REQUEST, __opus_check_int(x)

typedef void (*downmix_func)(const void *, opus_val32 *, int, int, int, int, int);
void downmix_float(const void *_x, opus_val32 *sub, int subframe, int offset, int c1, int c2, int C);
void downmix_int(const void *_x, opus_val32 *sub, int subframe, int offset, int c1, int c2, int C);

int encode_size(int size, unsigned char *data);

opus_int32 frame_size_select(opus_int32 frame_size, int variable_duration, opus_int32 Fs);

opus_int32 opus_encode_native(OpusEncoder *st, const opus_val16 *pcm, int frame_size,
      unsigned char *data, opus_int32 out_data_bytes, int lsb_depth,
      const void *analysis_pcm, opus_int32 analysis_size, int c1, int c2,
      int analysis_channels, downmix_func downmix, int float_api);

int opus_decode_native(OpusDecoder *st, const unsigned char *data, opus_int32 len,
      opus_val16 *pcm, int frame_size, int decode_fec, int self_delimited,
      opus_int32 *packet_offset, int soft_clip);

/* Make sure everything is properly aligned. */
static OPUS_INLINE int align(int i)
{
    struct foo {char c; union { void* p; opus_int32 i; opus_val32 v; } u;};

    unsigned int alignment = offsetof(struct foo, u);

    /* Optimizing compilers should optimize div and multiply into and
       for all sensible alignment values. */
    return ((i + alignment - 1) / alignment) * alignment;
}

int opus_packet_parse_impl(const unsigned char *data, opus_int32 len,
      int self_delimited, unsigned char *out_toc,
      const unsigned char *frames[48], opus_int16 size[48],
      int *payload_offset, opus_int32 *packet_offset);

opus_int32 opus_repacketizer_out_range_impl(OpusRepacketizer *rp, int begin, int end,
      unsigned char *data, opus_int32 maxlen, int self_delimited, int pad);

int pad_frame(unsigned char *data, opus_int32 len, opus_int32 new_len);

int opus_multistream_encode_native
(
  struct OpusMSEncoder *st,
  opus_copy_channel_in_func copy_channel_in,
  const void *pcm,
  int analysis_frame_size,
  unsigned char *data,
  opus_int32 max_data_bytes,
  int lsb_depth,
  downmix_func downmix,
  int float_api,
  void *user_data
);

int opus_multistream_decode_native(
  struct OpusMSDecoder *st,
  const unsigned char *data,
  opus_int32 len,
  void *pcm,
  opus_copy_channel_out_func copy_channel_out,
  int frame_size,
  int decode_fec,
  int soft_clip,
  void *user_data
);

#endif /* OPUS_PRIVATE_H */