Build: Include coders specific to hwaccell APIs

ffmpeg/_build.py

@@ -40,6 +40,8 @@ CODEC_DESCRIPTION_RE = re.compile(
 CODEC_CODERS_RE = re.compile(
     r' \((?P<type>(de|en)coders): (?P<coders>[^)]+) \)')
 
+HWACCEL_SYNONYMS = dict(cuvid=['nvenc', 'nvdec', 'cuda'])
+
 FILTER_RE = re.compile(
     r'^ (?P<timeline>[T.])(?P<slice>[S.])(?P<command>[C.]) '
     r'(?P<name>[^ ]+) +(?P<io>[^ ]+) +(?P<description>.+)$',
@@ -248,22 +250,53 @@ def get_hw_devices(cmd='ffmpeg'):
 
 def get_hwaccels(cmd='ffmpeg'):
     """
-    Extract the hwaccels of the ffmpeg build.
+    Extract the hwaccels of the ffmpeg build, including specific codecs.
+
+    Return all the hardware acceleration APIs supported by this build
+    including all the codecs that are specific to the API.
     """
+    data = dict(codecs=get_codecs(cmd=cmd), hwaccels=[])
+
     stdout = _run([cmd, '-hwaccels'])
-    return stdout.split('\n')[1:-2]
+    hwaccel_names = stdout.split('\n')[1:-2]
+
+    for hwaccel_name in hwaccel_names:
+        hwaccel = dict(name=hwaccel_name)
+        data['hwaccels'].append(hwaccel)
+        hwaccel['codecs'] = hwaccel_codecs = {}
+        for codec_name, codec in data['codecs'].items():
+            hwaccel_codec = {}
+            for coders_key in ('decoders', 'encoders'):
+                matching_coders = []
+                for coder in codec.get(coders_key, []):
+                    for synonym in (
+                            [hwaccel_name] +
+                            HWACCEL_SYNONYMS.get(hwaccel_name, [])):
+                        if (
+                                coder == synonym or
+                                '_' + synonym in coder or
+                                synonym + '_' in coder):
+                            matching_coders.append(coder)
+                            break
+                if matching_coders:
+                    hwaccel_codec[coders_key] = matching_coders
+            if hwaccel_codec:
+                hwaccel_codecs[codec_name] = hwaccel_codec
+
+    return data
 
 
 def get_build_data(cmd='ffmpeg'):
     """
     Extract details about the ffmpeg build.
     """
+    hwaccels_data = get_hwaccels(cmd=cmd)
     return dict(
         version=get_version(cmd=cmd),
         formats=get_formats(cmd=cmd),
         demuxers=get_demuxers(cmd=cmd),
         muxers=get_muxers(cmd=cmd),
-        codecs=get_codecs(cmd=cmd),
+        codecs=hwaccels_data['codecs'],
         bsfs=get_bsfs(cmd=cmd),
         protocols=get_protocols(cmd=cmd),
         filters=get_filters(cmd=cmd),
@@ -273,7 +306,7 @@ def get_build_data(cmd='ffmpeg'):
         colors=get_colors(cmd=cmd),
         devices=get_devices(cmd=cmd),
         hw_devices=get_hw_devices(cmd=cmd),
-        hwaccels=get_hwaccels(cmd=cmd))
+        hwaccels=hwaccels_data['hwaccels'])
 
 __all__ = [
     'get_build_data',

ffmpeg/_detect.py

@@ -43,10 +43,6 @@ HWACCELS_BY_PERFORMANCE = [
     'qsv', 'd3d11va', 'dxva2', 'vaapi', 'drm']
 # Loaded from JSON
 DATA = None
-# Some accelerated codecs use a different prefix than the base codec
-CODEC_SYNONYMS = {
-    'mpeg1video': 'mpeg1',
-    'mpeg2video': 'mpeg2'}
 
 
 def detect_gpu():
@@ -67,14 +63,15 @@ def detect_hwaccels(hwaccels=None, cmd='ffmpeg'):
     Extract details about the ffmpeg build.
     """
     # Filter against what's available in the ffmpeg build
-    build_hwaccels = ffmpeg.get_hwaccels(cmd=cmd)
+    hwaccels_data = ffmpeg.get_hwaccels(cmd=cmd)
     if hwaccels is None:
         # Consider all the available hwaccels
-        hwaccels = build_hwaccels
+        hwaccels = hwaccels_data['hwaccels']
     else:
         # Support passing in a restricted set of hwaccels
         hwaccels = [
-            hwaccel for hwaccel in hwaccels if hwaccel in build_hwaccels]
+            hwaccel for hwaccel in hwaccels_data['hwaccels']
+            if hwaccel['name'] in hwaccels]
 
     # Filter against which APIs are available on this OS+GPU
     data = _get_data()
@@ -82,16 +79,18 @@ def detect_hwaccels(hwaccels=None, cmd='ffmpeg'):
     gpu = detect_gpu()
     api_avail = data['hwaccels']['api_avail'][plat_sys][
         gpu['vendor'].replace(' Corporation', '')]
-    hwaccels = [hwaccel for hwaccel in hwaccels if hwaccel in api_avail]
+    hwaccels = [
+        hwaccel for hwaccel in hwaccels if hwaccel['name'] in api_avail]
 
     hwaccels.sort(key=lambda hwaccel: (
         # Sort unranked hwaccels last, but in the order given by ffmpeg
-        hwaccel not in HWACCELS_BY_PERFORMANCE,
+        hwaccel['name'] in HWACCELS_BY_PERFORMANCE and 1 or 0,
         (
             # Sort ranked hwaccels per the constant
-            hwaccel in HWACCELS_BY_PERFORMANCE and
-            HWACCELS_BY_PERFORMANCE.index(hwaccel))))
-    return hwaccels
+            hwaccel['name'] in HWACCELS_BY_PERFORMANCE and
+            HWACCELS_BY_PERFORMANCE.index(hwaccel['name']))))
+    hwaccels_data['hwaccels'] = hwaccels
+    return hwaccels_data
 
 
 def detect_coder(

ffmpeg/tests/test_ffmpeg.py

@@ -727,7 +727,16 @@ def test__build_data():
 
     assert isinstance(data['version'], str)
 
-    for fields_key in {'formats', 'demuxers', 'muxers', 'codecs', 'filters'}:
+    assert isinstance(data['codecs'], dict)
+    for codec, coders in data['codecs'].items():
+        assert isinstance(codec, str)
+        assert isinstance(coders, dict)
+    assert isinstance(data['hwaccels'], list)
+    for hwaccel in data['hwaccels']:
+        assert isinstance(hwaccel, dict)
+        assert 'name' in hwaccel
+
+    for fields_key in {'formats', 'demuxers', 'muxers', 'filters'}:
         assert isinstance(data[fields_key], dict)
 
     list_keys = {'bsfs'}
@@ -741,10 +750,13 @@ def test__build_data():
 
 
 def test__detect():
-    for hwaccels in [
+    for hwaccels_data in [
             ffmpeg.detect_hwaccels(),
             ffmpeg.detect_hwaccels(['foohwaccel'])]:
-        assert isinstance(hwaccels, list)
+        assert isinstance(hwaccels_data['hwaccels'], list)
+        for hwaccel in hwaccels_data['hwaccels']:
+            assert isinstance(hwaccel, dict)
+            assert 'name' in hwaccel
 
     for codecs in [
             ffmpeg.detect_codecs('h264', 'h264'),