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      1 /*
      2  * Copyright 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 //#define LOG_NDEBUG 0
     18 #define LOG_TAG "audio_utils_format_tests"
     19 #include <log/log.h>
     20 
     21 #include <audio_utils/format.h>
     22 #include <gtest/gtest.h>
     23 
     24 /** returns true if the format is a common source or destination format.
     25     memcpy_by_audio_format() allows interchange between any PCM format and the
     26     "common" PCM 16 bit and PCM float formats. */
     27 static bool is_common_format(audio_format_t format) {
     28     return format == AUDIO_FORMAT_PCM_16_BIT || format == AUDIO_FORMAT_PCM_FLOAT;
     29 }
     30 
     31 // Initialize PCM 16 bit ramp for basic data sanity check (generated from PCM 8 bit data).
     32 // TODO: consider creating fillPseudoRandomValue().
     33 template<size_t size>
     34 static void fillRamp(int16_t(&buffer)[size])
     35 {
     36     // Create PCM 16 bit data based on PCM 8 bit format because PCM 8 bit is convertible
     37     // to all other audio formats without loss; hence, round trip conversion preserves equality.
     38     uint8_t bytes[size];
     39     for (size_t i = 0; i < size; ++i) {
     40         bytes[i] = i;
     41     }
     42     // convert to PCM 16 bit
     43     memcpy_by_audio_format(
     44             buffer, AUDIO_FORMAT_PCM_16_BIT,
     45             bytes, AUDIO_FORMAT_PCM_8_BIT, size);
     46 
     47     uint8_t check[size];
     48     memcpy_by_audio_format(
     49             check, AUDIO_FORMAT_PCM_8_BIT,
     50             buffer, AUDIO_FORMAT_PCM_16_BIT, size);
     51     EXPECT_EQ(0, memcmp(check, bytes, size));
     52 }
     53 
     54 class FormatTest : public testing::TestWithParam<std::tuple<audio_format_t, audio_format_t>>
     55 {
     56 };
     57 
     58 TEST_P(FormatTest, memcpy_by_audio_format)
     59 {
     60     // fetch parameters
     61     const auto param = GetParam();
     62     const audio_format_t src_encoding = std::get<0>(param);
     63     const audio_format_t dst_encoding = std::get<1>(param);
     64 
     65     // either source or destination (or both) need to be a common format
     66     if (!is_common_format(src_encoding) && !is_common_format(dst_encoding)) {
     67         printf("skip conversion src:%#x  dst:%#x\n", src_encoding, dst_encoding);
     68         return;
     69     }
     70 
     71     constexpr size_t SAMPLES = UINT8_MAX;
     72     constexpr audio_format_t orig_encoding = AUDIO_FORMAT_PCM_16_BIT;
     73     int16_t orig_data[SAMPLES];
     74 
     75     fillRamp(orig_data);
     76 
     77     // data buffer for in-place conversion (uint32_t is maximum sample size of 4 bytes)
     78     uint32_t data[SAMPLES];
     79     // check buffer is used to compare out-of-place vs in-place conversion.
     80     uint32_t check[SAMPLES];
     81 
     82     printf("trying conversion src:%#x  dst:%#x\n", src_encoding, dst_encoding);
     83     fflush(stdout);
     84     // Copy original data to data buffer at src_encoding.
     85     memcpy_by_audio_format(
     86             data, src_encoding,
     87             orig_data, orig_encoding, SAMPLES);
     88 
     89     // Convert from src encoding to dst encoding.
     90     memcpy_by_audio_format(
     91             check, dst_encoding,
     92             data, src_encoding, SAMPLES);
     93 
     94     // Check in-place is same as out-of-place conversion.
     95     memcpy_by_audio_format(
     96             data, dst_encoding,
     97             data, src_encoding, SAMPLES);
     98     EXPECT_EQ(0, memcmp(check, data, SAMPLES * audio_bytes_per_sample(dst_encoding)));
     99 
    100     // Go back to the original data encoding for comparison.
    101     memcpy_by_audio_format(
    102             data, orig_encoding,
    103             data, dst_encoding, SAMPLES);
    104 
    105     // Raw byte compare at the original encoding must succeed - our conversions
    106     // must be lossless for PCM 8 bit representation which orig_data was constructed from.
    107     EXPECT_EQ(0,
    108             memcmp(data, orig_data, SAMPLES * audio_bytes_per_sample(orig_encoding)));
    109 }
    110 
    111 INSTANTIATE_TEST_CASE_P(FormatVariations, FormatTest, ::testing::Combine(
    112     ::testing::Values(
    113         AUDIO_FORMAT_PCM_8_BIT,
    114         AUDIO_FORMAT_PCM_16_BIT,
    115         AUDIO_FORMAT_PCM_FLOAT,
    116         AUDIO_FORMAT_PCM_24_BIT_PACKED,
    117         AUDIO_FORMAT_PCM_32_BIT,
    118         AUDIO_FORMAT_PCM_8_24_BIT
    119     ),
    120     ::testing::Values(
    121         AUDIO_FORMAT_PCM_8_BIT,
    122         AUDIO_FORMAT_PCM_16_BIT,
    123         AUDIO_FORMAT_PCM_FLOAT,
    124         AUDIO_FORMAT_PCM_24_BIT_PACKED,
    125         AUDIO_FORMAT_PCM_32_BIT,
    126         AUDIO_FORMAT_PCM_8_24_BIT
    127     )));
    128