def EXACT_SILENCE_PCM_Reader(pcm_frames, sample_rate=44100, channels=2, bits_per_sample=16, channel_mask=None): from audiotools.decoders import SameSample if channel_mask is None: channel_mask = int(audiotools.ChannelMask.from_channels(channels)) return SameSample(sample=0, total_pcm_frames=pcm_frames, sample_rate=sample_rate, channels=channels, channel_mask=channel_mask, bits_per_sample=bits_per_sample)
def BLANK_PCM_Reader(length, sample_rate=44100, channels=2, bits_per_sample=16, channel_mask=None): from audiotools.decoders import SameSample if channel_mask is None: channel_mask = int(audiotools.ChannelMask.from_channels(channels)) return SameSample(sample=1, total_pcm_frames=length * sample_rate, sample_rate=sample_rate, channels=channels, channel_mask=channel_mask, bits_per_sample=bits_per_sample)
def accuraterip_checksum(progress, track, previous_track, next_track, ar_matches): from audiotools import (transfer_data, PCMCat, PCMReaderHead, PCMReaderDeHead, PCMReaderProgress) from audiotools.decoders import SameSample from audiotools.accuraterip import Checksum, match_offset # unify previous track, current track and next track into a single stream pcmreaders = [] if previous_track is not None: frames_to_skip = previous_track.total_frames() - PREVIOUS_TRACK_FRAMES prev_pcmreader = previous_track.to_pcm() if hasattr(prev_pcmreader, "seek") and callable(prev_pcmreader.seek): frames_to_skip -= prev_pcmreader.seek(frames_to_skip) pcmreaders.append(PCMReaderDeHead(prev_pcmreader, frames_to_skip)) else: pcmreaders.append( SameSample(sample=0, total_pcm_frames=PREVIOUS_TRACK_FRAMES, sample_rate=track.sample_rate(), channels=track.channels(), channel_mask=int(track.channel_mask()), bits_per_sample=track.bits_per_sample())) pcmreaders.append(track.to_pcm()) if next_track is not None: pcmreaders.append(PCMReaderHead(next_track.to_pcm(), NEXT_TRACK_FRAMES)) else: pcmreaders.append( SameSample(sample=0, total_pcm_frames=NEXT_TRACK_FRAMES, sample_rate=track.sample_rate(), channels=track.channels(), channel_mask=int(track.channel_mask()), bits_per_sample=track.bits_per_sample())) # feed stream to checksummer checksummer = Checksum(total_pcm_frames=track.total_frames(), sample_rate=track.sample_rate(), is_first=(previous_track is None), is_last=(next_track is None), pcm_frame_range=PREVIOUS_TRACK_FRAMES + 1 + NEXT_TRACK_FRAMES, accurateripv2_offset=PREVIOUS_TRACK_FRAMES) try: pcmreader = PCMReaderProgress( PCMCat(pcmreaders), PREVIOUS_TRACK_FRAMES + track.total_frames() + NEXT_TRACK_FRAMES, progress) audiotools.transfer_data(pcmreader.read, checksummer.update) except (IOError, ValueError) as err: return { "filename": audiotools.Filename(track.filename).__unicode__(), "error": str(err), "v1": { "checksum": None, "offset": None, "confidence": None }, "v2": { "checksum": None, "offset": None, "confidence": None } } # determine checksum, confidence and offset from # the calculated checksums and possible AccurateRip matches (checksum_v2, confidence_v2, offset_v2) = match_offset(ar_matches, checksums=[checksummer.checksum_v2()], initial_offset=0) (checksum_v1, confidence_v1, offset_v1) = match_offset(ar_matches=ar_matches, checksums=checksummer.checksums_v1(), initial_offset=-PREVIOUS_TRACK_FRAMES) if len(ar_matches) == 0: return { "filename": audiotools.Filename(track.filename).__unicode__(), "error": None, "v1": { "checksum": checksum_v1, "offset": offset_v1, "confidence": AR_NOT_FOUND }, "v2": { "checksum": checksum_v2, "offset": offset_v2, "confidence": AR_NOT_FOUND } } else: return { "filename": audiotools.Filename(track.filename).__unicode__(), "error": None, "v1": { "checksum": checksum_v1, "offset": offset_v1, "confidence": (confidence_v1 if (confidence_v1 is not None) else AR_MISMATCH) }, "v2": { "checksum": checksum_v2, "offset": offset_v2, "confidence": (confidence_v2 if (confidence_v2 is not None) else AR_MISMATCH) } }