1 files changed, 88 insertions, 0 deletions
diff --git a/lvc/settings.py b/lvc/settings.py
new file mode 100644
index 0000000..a9b8266
--- /dev/null
+++ b/lvc/settings.py
@@ -0,0 +1,88 @@
+import logging
+import os
+import sys
+
+from lvc import execute
+
+ffmpeg_version = None
+
+_search_path_extra = []
+def add_to_search_path(directory):
+    """Add a path to the list of paths that which() searches."""
+    _search_path_extra.append(directory)
+
+def which(name):
+    if sys.platform == 'win32':
+        name = name + '.exe' # we're looking for ffmpeg.exe in this case
+    if sys.platform == 'darwin' and 'Contents/Resources' in __file__:
+        # look for a bundled version
+        path = os.path.join(os.path.dirname(__file__),
+                            '..', '..', '..', '..', 'Helpers', name)
+        if os.path.exists(path):
+            return path
+    dirs_to_search = os.environ['PATH'].split(os.pathsep)
+    dirs_to_search += _search_path_extra
+    for dirname in dirs_to_search:
+        fullpath = os.path.join(dirname, name)
+        # XXX check for +x bit
+        if os.path.exists(fullpath):
+            return fullpath
+    logging.warn("Can't find path to %s (searched in %s)", name,
+            dirs_to_search)
+
+def memoize(func):
+    cache = []
+    def wrapper():
+        if not cache:
+            cache.append(func())
+        return cache[0]
+    return wrapper
+
+@memoize
+def get_ffmpeg_executable_path():
+    return which("ffmpeg")
+    avconv = which('avconv')
+    if avconv is not None:
+       return avconv
+    return which("ffmpeg")
+
+def get_ffmpeg_version():
+    global ffmpeg_version
+    if ffmpeg_version is None:
+        commandline = [get_ffmpeg_executable_path(), '-version']
+        p = execute.Popen(commandline, stderr=open(os.devnull, "wb"))
+        stdout, _ = p.communicate()
+        lines = stdout.split('\n')
+        version = lines[0].rsplit(' ', 1)[1].split('.')
+        def maybe_int(v):
+            try:
+                return int(v)
+            except ValueError:
+                return v
+        ffmpeg_version = tuple(maybe_int(v) for v in version)
+    return ffmpeg_version
+
+def customize_ffmpeg_parameters(params):
+    """Takes a list of parameters and modifies it based on
+    platform-specific issues.  Returns the newly modified list of
+    parameters.
+
+    :param params: list of parameters to modify
+
+    :returns: list of modified parameters that will get passed to
+        ffmpeg
+    """
+    if get_ffmpeg_version() < (0, 8):
+        # Fallback for older versions of FFmpeg (Ubuntu Natty, in particular).
+        # see also #18969
+        params = ['-vpre' if i == '-preset' else i for i in params]
+        try:
+            profile_index = params.index('-profile:v')
+        except ValueError:
+            pass
+        else:
+            if params[profile_index + 1] == 'baseline':
+                params[profile_index:profile_index+2] = [
+                    '-coder', '0', '-bf', '0', '-refs', '1',
+                    '-flags2', '-wpred-dct8x8']
+    return params