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/*
* Copyright © 2016 Mozilla Foundation
*
* This program is made available under an ISC-style license. See the
* accompanying file LICENSE for details.
*/
#include "gtest/gtest.h"
#include "cubeb/cubeb.h"
#include "cubeb_mixer.h"
#include "common.h"
#include <memory>
#include <vector>
using std::vector;
#define STREAM_FREQUENCY 48000
#define STREAM_FORMAT CUBEB_SAMPLE_FLOAT32LE
float const M = 1.0f; // Mono
float const L = 2.0f; // Left
float const R = 3.0f; // Right
float const C = 4.0f; // Center
float const LS = 5.0f; // Left Surround
float const RS = 6.0f; // Right Surround
float const RLS = 7.0f; // Rear Left Surround
float const RC = 8.0f; // Rear Center
float const RRS = 9.0f; // Rear Right Surround
float const LFE = 10.0f; // Low Frequency Effects
float const INV_SQRT_2 = 0.707106f; // 1/sqrt(2)
static float const DOWNMIX_3F2_RESULTS[2][12][5] = {
// 3F2
{
{ INV_SQRT_2*(L+R) + C + 0.5f*(LS+RS) }, // Mono
{ INV_SQRT_2*(L+R) + C + 0.5f*(LS+RS), 0 }, // Mono-LFE
{ L + INV_SQRT_2*(C+LS), R + INV_SQRT_2*(C+RS) }, // Stereo
{ L + INV_SQRT_2*(C+LS), R + INV_SQRT_2*(C+RS), 0 }, // Stereo-LFE
{ L + INV_SQRT_2*LS, R + INV_SQRT_2*RS, C }, // 3F
{ L + INV_SQRT_2*LS, R + INV_SQRT_2*RS, C, 0 }, // 3F-LFE
{ L + C*INV_SQRT_2, R + C*INV_SQRT_2, INV_SQRT_2*(LS+RS) }, // 2F1
{ L + C*INV_SQRT_2, R + C*INV_SQRT_2, 0, INV_SQRT_2*(LS+RS) }, // 2F1-LFE
{ L, R, C, INV_SQRT_2*(LS+RS) }, // 3F1
{ L, R, C, 0, INV_SQRT_2*(LS+RS) }, // 3F1-LFE
{ L + INV_SQRT_2*C, R + INV_SQRT_2*C, LS, RS }, // 2F2
{ L + INV_SQRT_2*C, R + INV_SQRT_2*C, 0, LS, RS } // 2F2-LFE
},
// 3F2-LFE
{
{ INV_SQRT_2*(L+R) + C + 0.5f*(LS+RS) }, // Mono
{ INV_SQRT_2*(L+R) + C + 0.5f*(LS+RS), LFE }, // Mono-LFE
{ L + INV_SQRT_2*(C+LS), R + INV_SQRT_2*(C+RS) }, // Stereo
{ L + INV_SQRT_2*(C+LS), R + INV_SQRT_2*(C+RS), LFE }, // Stereo-LFE
{ L + INV_SQRT_2*LS, R + INV_SQRT_2*RS, C }, // 3F
{ L + INV_SQRT_2*LS, R + INV_SQRT_2*RS, C, LFE }, // 3F-LFE
{ L + C*INV_SQRT_2, R + C*INV_SQRT_2, INV_SQRT_2*(LS+RS) }, // 2F1
{ L + C*INV_SQRT_2, R + C*INV_SQRT_2, LFE, INV_SQRT_2*(LS+RS) }, // 2F1-LFE
{ L, R, C, INV_SQRT_2*(LS+RS) }, // 3F1
{ L, R, C, LFE, INV_SQRT_2*(LS+RS) }, // 3F1-LFE
{ L + INV_SQRT_2*C, R + INV_SQRT_2*C, LS, RS }, // 2F2
{ L + INV_SQRT_2*C, R + INV_SQRT_2*C, LFE, LS, RS } // 2F2-LFE
}
};
typedef struct {
cubeb_channel_layout layout;
float data[10];
} audio_input;
audio_input audio_inputs[CUBEB_LAYOUT_MAX] = {
{ CUBEB_LAYOUT_UNDEFINED, { } },
{ CUBEB_LAYOUT_DUAL_MONO, { L, R } },
{ CUBEB_LAYOUT_DUAL_MONO_LFE, { L, R, LFE } },
{ CUBEB_LAYOUT_MONO, { M } },
{ CUBEB_LAYOUT_MONO_LFE, { M, LFE } },
{ CUBEB_LAYOUT_STEREO, { L, R } },
{ CUBEB_LAYOUT_STEREO_LFE, { L, R, LFE } },
{ CUBEB_LAYOUT_3F, { L, R, C } },
{ CUBEB_LAYOUT_3F_LFE, { L, R, C, LFE } },
{ CUBEB_LAYOUT_2F1, { L, R, RC } },
{ CUBEB_LAYOUT_2F1_LFE, { L, R, LFE, RC } },
{ CUBEB_LAYOUT_3F1, { L, R, C, RC } },
{ CUBEB_LAYOUT_3F1_LFE, { L, R, C, LFE, RC } },
{ CUBEB_LAYOUT_2F2, { L, R, LS, RS } },
{ CUBEB_LAYOUT_2F2_LFE, { L, R, LFE, LS, RS } },
{ CUBEB_LAYOUT_3F2, { L, R, C, LS, RS } },
{ CUBEB_LAYOUT_3F2_LFE, { L, R, C, LFE, LS, RS } },
{ CUBEB_LAYOUT_3F3R_LFE, { L, R, C, LFE, RC, LS, RS } },
{ CUBEB_LAYOUT_3F4_LFE, { L, R, C, LFE, RLS, RRS, LS, RS } }
};
char const * channel_names[CHANNEL_UNMAPPED + 1] = {
"mono", // CHANNEL_MONO
"left", // CHANNEL_LEFT
"right", // CHANNEL_RIGHT
"center", // CHANNEL_CENTER
"left surround", // CHANNEL_LS
"right surround", // CHANNEL_RS
"rear left surround", // CHANNEL_RLS
"rear center", // CHANNEL_RCENTER
"rear right surround", // CHANNEL_RRS
"low frequency effects", // CHANNEL_LFE
"unmapped" // CHANNEL_UNMAPPED
};
// The test cases must be aligned with cubeb_downmix.
void
downmix_test(float const * data, cubeb_channel_layout in_layout, cubeb_channel_layout out_layout)
{
if (in_layout == CUBEB_LAYOUT_UNDEFINED) {
return; // Only possible output layout would be UNDEFINED.
}
cubeb_stream_params in_params = {
STREAM_FORMAT,
STREAM_FREQUENCY,
layout_infos[in_layout].channels,
in_layout
};
cubeb_stream_params out_params = {
STREAM_FORMAT,
STREAM_FREQUENCY,
// To downmix audio data with undefined layout, its channel number must be
// smaller than or equal to the input channels.
(out_layout == CUBEB_LAYOUT_UNDEFINED) ?
layout_infos[in_layout].channels : layout_infos[out_layout].channels,
out_layout
};
if (!cubeb_should_downmix(&in_params, &out_params)) {
return;
}
fprintf(stderr, "Downmix from %s to %s\n", layout_infos[in_layout].name, layout_infos[out_layout].name);
unsigned int const inframes = 10;
vector<float> in(in_params.channels * inframes);
#if defined(__APPLE__)
// The mixed buffer size doesn't be changed based on the channel layout set on OSX.
// Please see the comment above downmix_3f2 in cubeb_mixer.cpp.
vector<float> out(in_params.channels * inframes);
#else
// In normal case, the mixed buffer size is based on the mixing channel layout.
vector<float> out(out_params.channels * inframes);
#endif
for (unsigned int offset = 0 ; offset < inframes * in_params.channels ; offset += in_params.channels) {
for (unsigned int i = 0 ; i < in_params.channels ; ++i) {
in[offset + i] = data[i];
}
}
// Create a mixer for downmix only.
std::unique_ptr<cubeb_mixer, decltype(&cubeb_mixer_destroy)>
mixer(cubeb_mixer_create(in_params.format, CUBEB_MIXER_DIRECTION_DOWNMIX), cubeb_mixer_destroy);
assert(!in.empty() && !out.empty() && out.size() <= in.size());
cubeb_mixer_mix(mixer.get(), inframes, in.data(), in.size(), out.data(), out.size(), &in_params, &out_params);
uint32_t in_layout_mask = 0;
for (unsigned int i = 0 ; i < in_params.channels; ++i) {
in_layout_mask |= 1 << CHANNEL_INDEX_TO_ORDER[in_layout][i];
}
uint32_t out_layout_mask = 0;
for (unsigned int i = 0 ; out_layout != CUBEB_LAYOUT_UNDEFINED && i < out_params.channels; ++i) {
out_layout_mask |= 1 << CHANNEL_INDEX_TO_ORDER[out_layout][i];
}
for (unsigned int i = 0 ; i < out.size() ; ++i) {
assert(in_params.channels && out_params.channels); // to pass the scan-build warning: Division by zero.
#if defined(__APPLE__)
// The size of audio mix buffer(vector out above) on OS X is same as input,
// so we need to check whether the out[i] will be dropped or not.
unsigned int index = i % in_params.channels;
if (index >= out_params.channels) {
// The out[i] will be dropped, so we don't care the data inside.
fprintf(stderr, "\tOS X: %d will be dropped. Ignore it.\n", i);
continue;
}
#else
unsigned int index = i % out_params.channels;
#endif
// downmix_3f2
if ((in_layout == CUBEB_LAYOUT_3F2 || in_layout == CUBEB_LAYOUT_3F2_LFE) &&
out_layout >= CUBEB_LAYOUT_MONO && out_layout <= CUBEB_LAYOUT_2F2_LFE) {
auto & downmix_results = DOWNMIX_3F2_RESULTS[in_layout - CUBEB_LAYOUT_3F2][out_layout - CUBEB_LAYOUT_MONO];
fprintf(stderr, "\t[3f2] %d(%s) - Expect: %lf, Get: %lf\n", i, channel_names[ CHANNEL_INDEX_TO_ORDER[out_layout][index] ], downmix_results[index], out[i]);
ASSERT_EQ(downmix_results[index], out[i]);
continue;
}
#if defined(__APPLE__)
fprintf(stderr, "\tOS X: We only support downmix for audio 5.1 currently.\n");
return;
#endif
// mix_remap
if (out_layout_mask & in_layout_mask) {
uint32_t mask = 1 << CHANNEL_INDEX_TO_ORDER[out_layout][index];
fprintf(stderr, "\t[remap] %d(%s) - Expect: %lf, Get: %lf\n", i, channel_names[ CHANNEL_INDEX_TO_ORDER[out_layout][index] ], (mask & in_layout_mask) ? audio_inputs[out_layout].data[index] : 0, out[i]);
ASSERT_EQ((mask & in_layout_mask) ? audio_inputs[out_layout].data[index] : 0, out[i]);
continue;
}
// downmix_fallback
fprintf(stderr, "\t[fallback] %d - Expect: %lf, Get: %lf\n", i, audio_inputs[in_layout].data[index], out[i]);
ASSERT_EQ(audio_inputs[in_layout].data[index], out[i]);
}
}
TEST(cubeb, mixer)
{
for (auto audio_input : audio_inputs) {
for (auto audio_output : layout_infos) {
downmix_test(audio_input.data, audio_input.layout, audio_output.layout);
}
}
}
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