1 files changed, 468 insertions, 0 deletions

diff --git a/media/libopus/src/opus_projection_encoder.c b/media/libopus/src/opus_projection_encoder.c
new file mode 100644
index 0000000000..06fb2d2526
--- /dev/null
+++ b/media/libopus/src/opus_projection_encoder.c
@@ -0,0 +1,468 @@
+/* Copyright (c) 2017 Google Inc.
+   Written by Andrew Allen */
+/*
+   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.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "mathops.h"
+#include "os_support.h"
+#include "opus_private.h"
+#include "opus_defines.h"
+#include "opus_projection.h"
+#include "opus_multistream.h"
+#include "stack_alloc.h"
+#include "mapping_matrix.h"
+
+struct OpusProjectionEncoder
+{
+  opus_int32 mixing_matrix_size_in_bytes;
+  opus_int32 demixing_matrix_size_in_bytes;
+  /* Encoder states go here */
+};
+
+#if !defined(DISABLE_FLOAT_API)
+static void opus_projection_copy_channel_in_float(
+  opus_val16 *dst,
+  int dst_stride,
+  const void *src,
+  int src_stride,
+  int src_channel,
+  int frame_size,
+  void *user_data
+)
+{
+  mapping_matrix_multiply_channel_in_float((const MappingMatrix*)user_data,
+    (const float*)src, src_stride, dst, src_channel, dst_stride, frame_size);
+}
+#endif
+
+static void opus_projection_copy_channel_in_short(
+  opus_val16 *dst,
+  int dst_stride,
+  const void *src,
+  int src_stride,
+  int src_channel,
+  int frame_size,
+  void *user_data
+)
+{
+  mapping_matrix_multiply_channel_in_short((const MappingMatrix*)user_data,
+    (const opus_int16*)src, src_stride, dst, src_channel, dst_stride, frame_size);
+}
+
+static int get_order_plus_one_from_channels(int channels, int *order_plus_one)
+{
+  int order_plus_one_;
+  int acn_channels;
+  int nondiegetic_channels;
+
+  /* Allowed numbers of channels:
+   * (1 + n)^2 + 2j, for n = 0...14 and j = 0 or 1.
+   */
+  if (channels < 1 || channels > 227)
+    return OPUS_BAD_ARG;
+
+  order_plus_one_ = isqrt32(channels);
+  acn_channels = order_plus_one_ * order_plus_one_;
+  nondiegetic_channels = channels - acn_channels;
+  if (nondiegetic_channels != 0 && nondiegetic_channels != 2)
+    return OPUS_BAD_ARG;
+
+  if (order_plus_one)
+    *order_plus_one = order_plus_one_;
+  return OPUS_OK;
+}
+
+static int get_streams_from_channels(int channels, int mapping_family,
+                                     int *streams, int *coupled_streams,
+                                     int *order_plus_one)
+{
+  if (mapping_family == 3)
+  {
+    if (get_order_plus_one_from_channels(channels, order_plus_one) != OPUS_OK)
+      return OPUS_BAD_ARG;
+    if (streams)
+      *streams = (channels + 1) / 2;
+    if (coupled_streams)
+      *coupled_streams = channels / 2;
+    return OPUS_OK;
+  }
+  return OPUS_BAD_ARG;
+}
+
+static MappingMatrix *get_mixing_matrix(OpusProjectionEncoder *st)
+{
+  /* void* cast avoids clang -Wcast-align warning */
+  return (MappingMatrix *)(void*)((char*)st +
+    align(sizeof(OpusProjectionEncoder)));
+}
+
+static MappingMatrix *get_enc_demixing_matrix(OpusProjectionEncoder *st)
+{
+  /* void* cast avoids clang -Wcast-align warning */
+  return (MappingMatrix *)(void*)((char*)st +
+    align(sizeof(OpusProjectionEncoder) +
+    st->mixing_matrix_size_in_bytes));
+}
+
+static OpusMSEncoder *get_multistream_encoder(OpusProjectionEncoder *st)
+{
+  /* void* cast avoids clang -Wcast-align warning */
+  return (OpusMSEncoder *)(void*)((char*)st +
+    align(sizeof(OpusProjectionEncoder) +
+    st->mixing_matrix_size_in_bytes +
+    st->demixing_matrix_size_in_bytes));
+}
+
+opus_int32 opus_projection_ambisonics_encoder_get_size(int channels,
+                                                       int mapping_family)
+{
+  int nb_streams;
+  int nb_coupled_streams;
+  int order_plus_one;
+  int mixing_matrix_rows, mixing_matrix_cols;
+  int demixing_matrix_rows, demixing_matrix_cols;
+  opus_int32 mixing_matrix_size, demixing_matrix_size;
+  opus_int32 encoder_size;
+  int ret;
+
+  ret = get_streams_from_channels(channels, mapping_family, &nb_streams,
+                                  &nb_coupled_streams, &order_plus_one);
+  if (ret != OPUS_OK)
+    return 0;
+
+  if (order_plus_one == 2)
+  {
+    mixing_matrix_rows = mapping_matrix_foa_mixing.rows;
+    mixing_matrix_cols = mapping_matrix_foa_mixing.cols;
+    demixing_matrix_rows = mapping_matrix_foa_demixing.rows;
+    demixing_matrix_cols = mapping_matrix_foa_demixing.cols;
+  }
+  else if (order_plus_one == 3)
+  {
+    mixing_matrix_rows = mapping_matrix_soa_mixing.rows;
+    mixing_matrix_cols = mapping_matrix_soa_mixing.cols;
+    demixing_matrix_rows = mapping_matrix_soa_demixing.rows;
+    demixing_matrix_cols = mapping_matrix_soa_demixing.cols;
+  }
+  else if (order_plus_one == 4)
+  {
+    mixing_matrix_rows = mapping_matrix_toa_mixing.rows;
+    mixing_matrix_cols = mapping_matrix_toa_mixing.cols;
+    demixing_matrix_rows = mapping_matrix_toa_demixing.rows;
+    demixing_matrix_cols = mapping_matrix_toa_demixing.cols;
+  }
+  else
+    return 0;
+
+  mixing_matrix_size =
+    mapping_matrix_get_size(mixing_matrix_rows, mixing_matrix_cols);
+  if (!mixing_matrix_size)
+    return 0;
+
+  demixing_matrix_size =
+    mapping_matrix_get_size(demixing_matrix_rows, demixing_matrix_cols);
+  if (!demixing_matrix_size)
+    return 0;
+
+  encoder_size =
+      opus_multistream_encoder_get_size(nb_streams, nb_coupled_streams);
+  if (!encoder_size)
+    return 0;
+
+  return align(sizeof(OpusProjectionEncoder)) +
+    mixing_matrix_size + demixing_matrix_size + encoder_size;
+}
+
+int opus_projection_ambisonics_encoder_init(OpusProjectionEncoder *st, opus_int32 Fs,
+                                            int channels, int mapping_family,
+                                            int *streams, int *coupled_streams,
+                                            int application)
+{
+  MappingMatrix *mixing_matrix;
+  MappingMatrix *demixing_matrix;
+  OpusMSEncoder *ms_encoder;
+  int i;
+  int ret;
+  int order_plus_one;
+  unsigned char mapping[255];
+
+  if (streams == NULL || coupled_streams == NULL) {
+    return OPUS_BAD_ARG;
+  }
+
+  if (get_streams_from_channels(channels, mapping_family, streams,
+    coupled_streams, &order_plus_one) != OPUS_OK)
+    return OPUS_BAD_ARG;
+
+  if (mapping_family == 3)
+  {
+    /* Assign mixing matrix based on available pre-computed matrices. */
+    mixing_matrix = get_mixing_matrix(st);
+    if (order_plus_one == 2)
+    {
+      mapping_matrix_init(mixing_matrix, mapping_matrix_foa_mixing.rows,
+        mapping_matrix_foa_mixing.cols, mapping_matrix_foa_mixing.gain,
+        mapping_matrix_foa_mixing_data,
+        sizeof(mapping_matrix_foa_mixing_data));
+    }
+    else if (order_plus_one == 3)
+    {
+      mapping_matrix_init(mixing_matrix, mapping_matrix_soa_mixing.rows,
+        mapping_matrix_soa_mixing.cols, mapping_matrix_soa_mixing.gain,
+        mapping_matrix_soa_mixing_data,
+        sizeof(mapping_matrix_soa_mixing_data));
+    }
+    else if (order_plus_one == 4)
+    {
+      mapping_matrix_init(mixing_matrix, mapping_matrix_toa_mixing.rows,
+        mapping_matrix_toa_mixing.cols, mapping_matrix_toa_mixing.gain,
+        mapping_matrix_toa_mixing_data,
+        sizeof(mapping_matrix_toa_mixing_data));
+    }
+    else
+      return OPUS_BAD_ARG;
+
+    st->mixing_matrix_size_in_bytes = mapping_matrix_get_size(
+      mixing_matrix->rows, mixing_matrix->cols);
+    if (!st->mixing_matrix_size_in_bytes)
+      return OPUS_BAD_ARG;
+
+    /* Assign demixing matrix based on available pre-computed matrices. */
+    demixing_matrix = get_enc_demixing_matrix(st);
+    if (order_plus_one == 2)
+    {
+      mapping_matrix_init(demixing_matrix, mapping_matrix_foa_demixing.rows,
+        mapping_matrix_foa_demixing.cols, mapping_matrix_foa_demixing.gain,
+        mapping_matrix_foa_demixing_data,
+        sizeof(mapping_matrix_foa_demixing_data));
+    }
+    else if (order_plus_one == 3)
+    {
+      mapping_matrix_init(demixing_matrix, mapping_matrix_soa_demixing.rows,
+        mapping_matrix_soa_demixing.cols, mapping_matrix_soa_demixing.gain,
+        mapping_matrix_soa_demixing_data,
+        sizeof(mapping_matrix_soa_demixing_data));
+    }
+    else if (order_plus_one == 4)
+    {
+      mapping_matrix_init(demixing_matrix, mapping_matrix_toa_demixing.rows,
+        mapping_matrix_toa_demixing.cols, mapping_matrix_toa_demixing.gain,
+        mapping_matrix_toa_demixing_data,
+        sizeof(mapping_matrix_toa_demixing_data));
+    }
+    else
+      return OPUS_BAD_ARG;
+
+    st->demixing_matrix_size_in_bytes = mapping_matrix_get_size(
+      demixing_matrix->rows, demixing_matrix->cols);
+    if (!st->demixing_matrix_size_in_bytes)
+      return OPUS_BAD_ARG;
+  }
+  else
+    return OPUS_UNIMPLEMENTED;
+
+  /* Ensure matrices are large enough for desired coding scheme. */
+  if (*streams + *coupled_streams > mixing_matrix->rows ||
+      channels > mixing_matrix->cols ||
+      channels > demixing_matrix->rows ||
+      *streams + *coupled_streams > demixing_matrix->cols)
+    return OPUS_BAD_ARG;
+
+  /* Set trivial mapping so each input channel pairs with a matrix column. */
+  for (i = 0; i < channels; i++)
+    mapping[i] = i;
+
+  /* Initialize multistream encoder with provided settings. */
+  ms_encoder = get_multistream_encoder(st);
+  ret = opus_multistream_encoder_init(ms_encoder, Fs, channels, *streams,
+                                      *coupled_streams, mapping, application);
+  return ret;
+}
+
+OpusProjectionEncoder *opus_projection_ambisonics_encoder_create(
+    opus_int32 Fs, int channels, int mapping_family, int *streams,
+    int *coupled_streams, int application, int *error)
+{
+  int size;
+  int ret;
+  OpusProjectionEncoder *st;
+
+  /* Allocate space for the projection encoder. */
+  size = opus_projection_ambisonics_encoder_get_size(channels, mapping_family);
+  if (!size) {
+    if (error)
+      *error = OPUS_ALLOC_FAIL;
+    return NULL;
+  }
+  st = (OpusProjectionEncoder *)opus_alloc(size);
+  if (!st)
+  {
+    if (error)
+      *error = OPUS_ALLOC_FAIL;
+    return NULL;
+  }
+
+  /* Initialize projection encoder with provided settings. */
+  ret = opus_projection_ambisonics_encoder_init(st, Fs, channels,
+     mapping_family, streams, coupled_streams, application);
+  if (ret != OPUS_OK)
+  {
+    opus_free(st);
+    st = NULL;
+  }
+  if (error)
+    *error = ret;
+  return st;
+}
+
+int opus_projection_encode(OpusProjectionEncoder *st, const opus_int16 *pcm,
+                           int frame_size, unsigned char *data,
+                           opus_int32 max_data_bytes)
+{
+  return opus_multistream_encode_native(get_multistream_encoder(st),
+    opus_projection_copy_channel_in_short, pcm, frame_size, data,
+    max_data_bytes, 16, downmix_int, 0, get_mixing_matrix(st));
+}
+
+#ifndef DISABLE_FLOAT_API
+#ifdef FIXED_POINT
+int opus_projection_encode_float(OpusProjectionEncoder *st, const float *pcm,
+                                 int frame_size, unsigned char *data,
+                                 opus_int32 max_data_bytes)
+{
+  return opus_multistream_encode_native(get_multistream_encoder(st),
+    opus_projection_copy_channel_in_float, pcm, frame_size, data,
+    max_data_bytes, 16, downmix_float, 1, get_mixing_matrix(st));
+}
+#else
+int opus_projection_encode_float(OpusProjectionEncoder *st, const float *pcm,
+                                 int frame_size, unsigned char *data,
+                                 opus_int32 max_data_bytes)
+{
+  return opus_multistream_encode_native(get_multistream_encoder(st),
+    opus_projection_copy_channel_in_float, pcm, frame_size, data,
+    max_data_bytes, 24, downmix_float, 1, get_mixing_matrix(st));
+}
+#endif
+#endif
+
+void opus_projection_encoder_destroy(OpusProjectionEncoder *st)
+{
+  opus_free(st);
+}
+
+int opus_projection_encoder_ctl(OpusProjectionEncoder *st, int request, ...)
+{
+  va_list ap;
+  MappingMatrix *demixing_matrix;
+  OpusMSEncoder *ms_encoder;
+  int ret = OPUS_OK;
+
+  ms_encoder = get_multistream_encoder(st);
+  demixing_matrix = get_enc_demixing_matrix(st);
+
+  va_start(ap, request);
+  switch(request)
+  {
+  case OPUS_PROJECTION_GET_DEMIXING_MATRIX_SIZE_REQUEST:
+  {
+    opus_int32 *value = va_arg(ap, opus_int32*);
+    if (!value)
+    {
+      goto bad_arg;
+    }
+    *value =
+      ms_encoder->layout.nb_channels * (ms_encoder->layout.nb_streams
+      + ms_encoder->layout.nb_coupled_streams) * sizeof(opus_int16);
+  }
+  break;
+  case OPUS_PROJECTION_GET_DEMIXING_MATRIX_GAIN_REQUEST:
+  {
+    opus_int32 *value = va_arg(ap, opus_int32*);
+    if (!value)
+    {
+      goto bad_arg;
+    }
+    *value = demixing_matrix->gain;
+  }
+  break;
+  case OPUS_PROJECTION_GET_DEMIXING_MATRIX_REQUEST:
+  {
+    int i, j, k, l;
+    int nb_input_streams;
+    int nb_output_streams;
+    unsigned char *external_char;
+    opus_int16 *internal_short;
+    opus_int32 external_size;
+    opus_int32 internal_size;
+
+    /* (I/O is in relation to the decoder's perspective). */
+    nb_input_streams = ms_encoder->layout.nb_streams +
+      ms_encoder->layout.nb_coupled_streams;
+    nb_output_streams = ms_encoder->layout.nb_channels;
+
+    external_char = va_arg(ap, unsigned char *);
+    external_size = va_arg(ap, opus_int32);
+    if (!external_char)
+    {
+      goto bad_arg;
+    }
+    internal_short = mapping_matrix_get_data(demixing_matrix);
+    internal_size = nb_input_streams * nb_output_streams * sizeof(opus_int16);
+    if (external_size != internal_size)
+    {
+      goto bad_arg;
+    }
+
+    /* Copy demixing matrix subset to output destination. */
+    l = 0;
+    for (i = 0; i < nb_input_streams; i++) {
+      for (j = 0; j < nb_output_streams; j++) {
+        k = demixing_matrix->rows * i + j;
+        external_char[2*l] = (unsigned char)internal_short[k];
+        external_char[2*l+1] = (unsigned char)(internal_short[k] >> 8);
+        l++;
+      }
+    }
+  }
+  break;
+  default:
+  {
+    ret = opus_multistream_encoder_ctl_va_list(ms_encoder, request, ap);
+  }
+  break;
+  }
+  va_end(ap);
+  return ret;
+
+bad_arg:
+  va_end(ap);
+  return OPUS_BAD_ARG;
+}
+