Add AMB/AMR-NB/AMR-WB support to "sox_io" backend (#1066)

build_tools/setup_helpers/extension.py

@@ -89,6 +89,8 @@ def _get_extra_objects():
             'libvorbisfile.a',
             'libvorbis.a',
             'libogg.a',
+            'libopencore-amrnb.a',
+            'libopencore-amrwb.a',
         ]
         for lib in libs:
             objs.append(str(_TP_INSTALL_DIR / 'lib' / lib))

test/torchaudio_unittest/sox_io_backend/info_test.py

@@ -122,6 +122,36 @@ class TestInfo(TempDirMixin, PytorchTestCase):
         assert info.num_frames == sample_rate * duration
         assert info.num_channels == num_channels
 
+    @parameterized.expand(list(itertools.product(
+        ['float32', 'int32', 'int16', 'uint8'],
+        [8000, 16000],
+        [1, 2],
+    )), name_func=name_func)
+    def test_amb(self, dtype, sample_rate, num_channels):
+        """`sox_io_backend.info` can check amb file correctly"""
+        duration = 1
+        path = self.get_temp_path('data.amb')
+        sox_utils.gen_audio_file(
+            path, sample_rate, num_channels,
+            bit_depth=sox_utils.get_bit_depth(dtype), duration=duration)
+        info = sox_io_backend.info(path)
+        assert info.sample_rate == sample_rate
+        assert info.num_frames == sample_rate * duration
+        assert info.num_channels == num_channels
+
+    def test_amr_nb(self):
+        """`sox_io_backend.info` can check amr-nb file correctly"""
+        duration = 1
+        num_channels = 1
+        sample_rate = 8000
+        path = self.get_temp_path('data.amr-nb')
+        sox_utils.gen_audio_file(
+            path, sample_rate=sample_rate, num_channels=num_channels, bit_depth=16, duration=duration)
+        info = sox_io_backend.info(path)
+        assert info.sample_rate == sample_rate
+        assert info.num_frames == sample_rate * duration
+        assert info.num_channels == num_channels
+
 
 @skipIfNoExtension
 class TestInfoOpus(PytorchTestCase):

test/torchaudio_unittest/sox_io_backend/load_test.py

@@ -142,6 +142,53 @@ class LoadTestBase(TempDirMixin, PytorchTestCase):
         assert sr == sample_rate
         self.assertEqual(data, data_ref, atol=4e-05, rtol=1.3e-06)
 
+    def assert_amb(self, dtype, sample_rate, num_channels, normalize, duration):
+        """`sox_io_backend.load` can load amb format.
+
+        This test takes the same strategy as mp3 to compare the result
+        """
+        path = self.get_temp_path('1.original.amb')
+        ref_path = self.get_temp_path('2.reference.wav')
+
+        # 1. Generate amb with sox
+        sox_utils.gen_audio_file(
+            path, sample_rate, num_channels,
+            encoding=sox_utils.get_encoding(dtype),
+            bit_depth=sox_utils.get_bit_depth(dtype), duration=duration)
+        # 2. Convert to wav with sox
+        sox_utils.convert_audio_file(path, ref_path)
+        # 3. Load amb with torchaudio
+        data, sr = sox_io_backend.load(path, normalize=normalize)
+        # 4. Load wav with scipy
+        data_ref = load_wav(ref_path, normalize=normalize)[0]
+        # 5. Compare
+        assert sr == sample_rate
+        self.assertEqual(data, data_ref, atol=4e-05, rtol=1.3e-06)
+
+    def assert_amr_nb(self, duration):
+        """`sox_io_backend.load` can load amr-nb format.
+
+        This test takes the same strategy as mp3 to compare the result
+        """
+        sample_rate = 8000
+        num_channels = 1
+        path = self.get_temp_path('1.original.amr-nb')
+        ref_path = self.get_temp_path('2.reference.wav')
+
+        # 1. Generate amr-nb with sox
+        sox_utils.gen_audio_file(
+            path, sample_rate, num_channels,
+            bit_depth=32, duration=duration)
+        # 2. Convert to wav with sox
+        sox_utils.convert_audio_file(path, ref_path)
+        # 3. Load amr-nb with torchaudio
+        data, sr = sox_io_backend.load(path)
+        # 4. Load wav with scipy
+        data_ref = load_wav(ref_path)[0]
+        # 5. Compare
+        assert sr == sample_rate
+        self.assertEqual(data, data_ref, atol=4e-05, rtol=1.3e-06)
+
 
 @skipIfNoExec('sox')
 @skipIfNoExtension
@@ -260,6 +307,20 @@ class TestLoad(LoadTestBase):
         """`sox_io_backend.load` can load sph format correctly."""
         self.assert_sphere(sample_rate, num_channels, duration=1)
 
+    @parameterized.expand(list(itertools.product(
+        ['float32', 'int32', 'int16'],
+        [8000, 16000],
+        [1, 2],
+        [False, True],
+    )), name_func=name_func)
+    def test_amb(self, dtype, sample_rate, num_channels, normalize):
+        """`sox_io_backend.load` can load sph format correctly."""
+        self.assert_amb(dtype, sample_rate, num_channels, normalize, duration=1)
+
+    def test_amr_nb(self):
+        """`sox_io_backend.load` can load amr_nb format correctly."""
+        self.assert_amr_nb(duration=1)
+
 
 @skipIfNoExec('sox')
 @skipIfNoExtension

test/torchaudio_unittest/sox_io_backend/save_test.py

@@ -200,6 +200,68 @@ class SaveTestBase(TempDirMixin, PytorchTestCase):
 
         self.assertEqual(found, expected)
 
+    def assert_amb(self, dtype, sample_rate, num_channels, duration):
+        """`sox_io_backend.save` can save amb format.
+
+        This test takes the same strategy as mp3 to compare the result
+        """
+        src_path = self.get_temp_path('1.reference.wav')
+        amb_path = self.get_temp_path('2.1.torchaudio.amb')
+        wav_path = self.get_temp_path('2.2.torchaudio.wav')
+        amb_path_sox = self.get_temp_path('3.1.sox.amb')
+        wav_path_sox = self.get_temp_path('3.2.sox.wav')
+
+        # 1. Generate original wav
+        data = get_wav_data(dtype, num_channels, normalize=False, num_frames=duration * sample_rate)
+        save_wav(src_path, data, sample_rate)
+        # 2.1. Convert the original wav to amb with torchaudio
+        sox_io_backend.save(amb_path, load_wav(src_path, normalize=False)[0], sample_rate)
+        # 2.2. Convert the amb to wav with Sox
+        sox_utils.convert_audio_file(amb_path, wav_path)
+        # 2.3. Load
+        found = load_wav(wav_path)[0]
+
+        # 3.1. Convert the original wav to amb with SoX
+        sox_utils.convert_audio_file(src_path, amb_path_sox)
+        # 3.2. Convert the amb to wav with Sox
+        sox_utils.convert_audio_file(amb_path_sox, wav_path_sox)
+        # 3.3. Load
+        expected = load_wav(wav_path_sox)[0]
+
+        self.assertEqual(found, expected)
+
+    def assert_amr_nb(self, duration):
+        """`sox_io_backend.save` can save amr_nb format.
+
+        This test takes the same strategy as mp3 to compare the result
+        """
+        sample_rate = 8000
+        num_channels = 1
+        src_path = self.get_temp_path('1.reference.wav')
+        amr_path = self.get_temp_path('2.1.torchaudio.amr-nb')
+        wav_path = self.get_temp_path('2.2.torchaudio.wav')
+        amr_path_sox = self.get_temp_path('3.1.sox.amr-nb')
+        wav_path_sox = self.get_temp_path('3.2.sox.wav')
+
+        # 1. Generate original wav
+        data = get_wav_data('int16', num_channels, normalize=False, num_frames=duration * sample_rate)
+        save_wav(src_path, data, sample_rate)
+        # 2.1. Convert the original wav to amr_nb with torchaudio
+        sox_io_backend.save(amr_path, load_wav(src_path, normalize=False)[0], sample_rate)
+        # 2.2. Convert the amr_nb to wav with Sox
+        sox_utils.convert_audio_file(amr_path, wav_path)
+        # 2.3. Load
+        found = load_wav(wav_path)[0]
+
+        # 3.1. Convert the original wav to amr_nb with SoX
+        sox_utils.convert_audio_file(src_path, amr_path_sox)
+        # 3.2. Convert the amr_nb to wav with Sox
+        sox_utils.convert_audio_file(amr_path_sox, wav_path_sox)
+        # 3.3. Load
+        expected = load_wav(wav_path_sox)[0]
+
+        self.assertEqual(found, expected)
+
 
 @skipIfNoExec('sox')
 @skipIfNoExtension
@@ -302,6 +364,19 @@ class TestSave(SaveTestBase):
         """`sox_io_backend.save` can save sph format."""
         self.assert_sphere(sample_rate, num_channels, duration=1)
 
+    @parameterized.expand(list(itertools.product(
+        ['float32', 'int32', 'int16', 'uint8'],
+        [8000, 16000],
+        [1, 2],
+    )), name_func=name_func)
+    def test_amb(self, dtype, sample_rate, num_channels):
+        """`sox_io_backend.save` can save amb format."""
+        self.assert_amb(dtype, sample_rate, num_channels, duration=1)
+
+    def test_amr_nb(self):
+        """`sox_io_backend.save` can save amr-nb format."""
+        self.assert_amr_nb(duration=1)
+
 
 @skipIfNoExec('sox')
 @skipIfNoExtension

third_party/CMakeLists.txt

@@ -16,6 +16,14 @@ ExternalProject_Add(libmad
   CONFIGURE_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/src/libmad/configure ${COMMON_ARGS}
 )
 
+ExternalProject_Add(amr
+  PREFIX ${CMAKE_CURRENT_SOURCE_DIR}
+  DOWNLOAD_DIR ${ARCHIVE_DIR}
+  URL https://sourceforge.net/projects/opencore-amr/files/opencore-amr/opencore-amr-0.1.5.tar.gz
+  URL_HASH SHA256=2c006cb9d5f651bfb5e60156dbff6af3c9d35c7bbcc9015308c0aff1e14cd341
+  CONFIGURE_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/src/amr/configure ${COMMON_ARGS}
+)
+
 ExternalProject_Add(libmp3lame
   PREFIX ${CMAKE_CURRENT_SOURCE_DIR}
   DOWNLOAD_DIR ${ARCHIVE_DIR}
@@ -72,11 +80,11 @@ ExternalProject_Add(opusfile
 
 ExternalProject_Add(libsox
   PREFIX ${CMAKE_CURRENT_SOURCE_DIR}
-  DEPENDS libogg libflac libvorbis opusfile libmp3lame libmad
+  DEPENDS libogg libflac libvorbis opusfile libmp3lame libmad amr
   DOWNLOAD_DIR ${ARCHIVE_DIR}
   URL https://downloads.sourceforge.net/project/sox/sox/14.4.2/sox-14.4.2.tar.bz2
   URL_HASH SHA256=81a6956d4330e75b5827316e44ae381e6f1e8928003c6aa45896da9041ea149c
   # OpenMP is by default compiled against GNU OpenMP, which conflicts with the version of OpenMP that PyTorch uses.
   # See https://github.com/pytorch/audio/pull/1026
-  CONFIGURE_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/build_codec_helper.sh ${CMAKE_CURRENT_SOURCE_DIR}/src/libsox/configure ${COMMON_ARGS} --with-lame --with-flac --with-mad --with-oggvorbis --without-alsa --without-coreaudio --without-png --without-oss --without-sndfile --with-opus --disable-openmp
+  CONFIGURE_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/build_codec_helper.sh ${CMAKE_CURRENT_SOURCE_DIR}/src/libsox/configure ${COMMON_ARGS} --with-lame --with-flac --with-mad --with-oggvorbis --without-alsa --without-coreaudio --without-png --without-oss --without-sndfile --with-opus --with-amrwb --with-amrnb --disable-openmp
 )

torchaudio/backend/sox_io_backend.py

@@ -40,18 +40,19 @@ def load(
         This function can handle all the codecs that underlying libsox can handle,
         however it is tested on the following formats;
 
-        * WAV
+        * WAV, AMB
 
             * 32-bit floating-point
             * 32-bit signed integer
             * 16-bit signed integer
-            * 8-bit unsigned integer
+            * 8-bit unsigned integer (WAV only)
 
         * MP3
         * FLAC
         * OGG/VORBIS
         * OPUS
         * SPHERE
+        * AMR-NB
 
         To load ``MP3``, ``FLAC``, ``OGG/VORBIS``, ``OPUS`` and other codecs ``libsox`` does not
         handle natively, your installation of ``torchaudio`` has to be linked to ``libsox``
@@ -119,7 +120,7 @@ def save(
     Note:
         Supported formats are;
 
-        * WAV
+        * WAV, AMB
 
             * 32-bit floating-point
             * 32-bit signed integer
@@ -130,6 +131,7 @@ def save(
         * FLAC
         * OGG/VORBIS
         * SPHERE
+        * AMR-NB
 
         To save ``MP3``, ``FLAC``, ``OGG/VORBIS``, and other codecs ``libsox`` does not
         handle natively, your installation of ``torchaudio`` has to be linked to ``libsox``
@@ -160,7 +162,7 @@ def save(
     filepath = str(filepath)
     if compression is None:
         ext = str(filepath).split('.')[-1].lower()
-        if ext in ['wav', 'sph']:
+        if ext in ['wav', 'sph', 'amb', 'amr-nb']:
             compression = 0.
         elif ext == 'mp3':
             compression = -4.5

torchaudio/csrc/sox_io.cpp

@@ -85,11 +85,17 @@ void save_audio_file(
     const std::string& file_name,
     const c10::intrusive_ptr<TensorSignal>& signal,
     const double compression) {
-  const auto tensor = signal->getTensor();
+  auto tensor = signal->tensor;
 
   validate_input_tensor(tensor);
 
   const auto filetype = get_filetype(file_name);
+  if (filetype == "amr-nb") {
+    const auto num_channels = tensor.size(signal->channels_first ? 0 : 1);
+    TORCH_CHECK(
+        num_channels == 1, "amr-nb format only supports single channel audio.");
+    tensor = (unnormalize_wav(tensor) / 65536).to(torch::kInt16);
+  }
   const auto signal_info = get_signalinfo(signal.get(), filetype);
   const auto encoding_info =
       get_encodinginfo(filetype, tensor.dtype(), compression);

torchaudio/csrc/sox_utils.cpp

@@ -223,7 +223,7 @@ sox_encoding_t get_encoding(
     return SOX_ENCODING_FLAC;
   if (filetype == "ogg" || filetype == "vorbis")
     return SOX_ENCODING_VORBIS;
-  if (filetype == "wav") {
+  if (filetype == "wav" || filetype == "amb") {
     if (dtype == torch::kUInt8)
       return SOX_ENCODING_UNSIGNED;
     if (dtype == torch::kInt16)
@@ -236,7 +236,9 @@ sox_encoding_t get_encoding(
   }
   if (filetype == "sph")
     return SOX_ENCODING_SIGN2;
-  throw std::runtime_error("Unsupported file type.");
+  if (filetype == "amr-nb")
+    return SOX_ENCODING_AMR_NB;
+  throw std::runtime_error("Unsupported file type: " + filetype);
 }
 
 unsigned get_precision(
@@ -248,7 +250,7 @@ unsigned get_precision(
     return 24;
   if (filetype == "ogg" || filetype == "vorbis")
     return SOX_UNSPEC;
-  if (filetype == "wav") {
+  if (filetype == "wav" || filetype == "amb") {
     if (dtype == torch::kUInt8)
       return 8;
     if (dtype == torch::kInt16)
@@ -261,7 +263,13 @@ unsigned get_precision(
   }
   if (filetype == "sph")
     return 32;
-  throw std::runtime_error("Unsupported file type.");
+  if (filetype == "amr-nb") {
+    TORCH_INTERNAL_ASSERT(
+        dtype == torch::kInt16,
+        "When saving to AMR-NB format, the input tensor must be int16 type.");
+    return 16;
+  }
+  throw std::runtime_error("Unsupported file type: " + filetype);
 }
 
 sox_signalinfo_t get_signalinfo(
@@ -287,11 +295,13 @@ sox_encodinginfo_t get_encodinginfo(
       return compression;
     if (filetype == "ogg" || filetype == "vorbis")
       return compression;
-    if (filetype == "wav")
+    if (filetype == "wav" || filetype == "amb")
       return 0.;
     if (filetype == "sph")
       return 0.;
-    throw std::runtime_error("Unsupported file type.");
+    if (filetype == "amr-nb")
+      return 0.;
+    throw std::runtime_error("Unsupported file type: " + filetype);
   }();
 
   return sox_encodinginfo_t{/*encoding=*/get_encoding(filetype, dtype),