def _decode_audio_packet(self):
packet = self._packet
size_out = ctypes.c_int(len(self._audio_buffer))
while True:
audio_packet_ptr = ctypes.cast(packet.data, ctypes.c_void_p)
audio_packet_size = packet.size
used = av.avbin_decode_audio(self._audio_stream, audio_packet_ptr,
audio_packet_size, self._audio_buffer,
size_out)
if used < 0:
self._audio_packet_size = 0
break
audio_packet_ptr.value += used
audio_packet_size -= used
if size_out.value <= 0:
continue
# XXX how did this ever work? replaced with copy below
# buffer = ctypes.string_at(self._audio_buffer, size_out)
# XXX to actually copy the data.. but it never used to crash, so
# maybe I'm missing something
buffer = ctypes.create_string_buffer(size_out.value)
ctypes.memmove(buffer, self._audio_buffer, len(buffer))
buffer = buffer.raw
duration = float(len(buffer)) / self.audio_format.bytes_per_second
self._audio_packet_timestamp = \
timestamp = timestamp_from_avbin(packet.timestamp)
return AudioData(buffer, len(buffer), timestamp, duration, [])
def get_audio_data(self, num_bytes):
num_bytes = min(num_bytes, self._max_offset - self._offset)
if num_bytes <= 0:
return None
timestamp = float(self._offset) / self._bytes_per_second
duration = float(num_bytes) / self._bytes_per_second
data = self._generate_data(num_bytes, self._offset)
self._offset += num_bytes
return AudioData(data, num_bytes, timestamp, duration, [])
def get_audio_data(self, bytes, compensation_time=0.0):
bytes = min(bytes, self._max_offset - self._offset)
if not bytes:
return None
data = self._file.read(bytes)
self._offset += len(data)
timestamp = float(self._offset) / self.audio_format.bytes_per_second
duration = float(bytes) / self.audio_format.bytes_per_second
return AudioData(data, len(data), timestamp, duration, [])
def get_audio_data(self, num_bytes, compensation_time=0.0):
"""Return `num_bytes` bytes of audio data."""
num_bytes = min(num_bytes, self._max_offset - self._offset)
if num_bytes <= 0:
return None
timestamp = float(self._offset) / self._bytes_per_second
duration = float(num_bytes) / self._bytes_per_second
data = self._generate_data(num_bytes, self._offset)
self._offset += num_bytes
return AudioData(data, num_bytes, timestamp, duration, [])
def _decode_audio_packet(self, audio_packet, compensation_time):
while True:
try:
size_out = self._ffmpeg_decode_audio(
audio_packet.packet,
self._audio_buffer,
compensation_time)
except FFmpegException:
break
if size_out <= 0:
break
buffer = create_string_buffer(size_out)
memmove(buffer, self._audio_buffer, len(buffer))
buffer = buffer.raw
duration = float(len(buffer)) / self.audio_format.bytes_per_second
timestamp = ffmpeg_get_frame_ts(self._audio_stream)
timestamp = timestamp_from_ffmpeg(timestamp)
return AudioData(buffer, len(buffer), timestamp, duration, [])
return AudioData(b"", 0, 0, 0, [])