207 lines
5.2 KiB
C++
207 lines
5.2 KiB
C++
/*
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* Copyright (C) 2003-2012 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* Common data structures and functions used by FLAC and OggFLAC
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*/
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#include "config.h"
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#include "FlacCommon.hxx"
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#include "FlacMetadata.hxx"
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#include "FlacPcm.hxx"
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#include "CheckAudioFormat.hxx"
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#include <glib.h>
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#include <assert.h>
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flac_data::flac_data(struct decoder *_decoder,
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struct input_stream *_input_stream)
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:FlacInput(_input_stream, _decoder),
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initialized(false), unsupported(false),
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total_frames(0), first_frame(0), next_frame(0), position(0),
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decoder(_decoder), input_stream(_input_stream),
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tag(nullptr)
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{
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}
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flac_data::~flac_data()
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{
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delete tag;
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}
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static enum sample_format
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flac_sample_format(unsigned bits_per_sample)
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{
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switch (bits_per_sample) {
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case 8:
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return SAMPLE_FORMAT_S8;
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case 16:
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return SAMPLE_FORMAT_S16;
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case 24:
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return SAMPLE_FORMAT_S24_P32;
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case 32:
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return SAMPLE_FORMAT_S32;
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default:
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return SAMPLE_FORMAT_UNDEFINED;
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}
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}
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static void
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flac_got_stream_info(struct flac_data *data,
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const FLAC__StreamMetadata_StreamInfo *stream_info)
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{
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if (data->initialized || data->unsupported)
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return;
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GError *error = nullptr;
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if (!audio_format_init_checked(&data->audio_format,
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stream_info->sample_rate,
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flac_sample_format(stream_info->bits_per_sample),
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stream_info->channels, &error)) {
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g_warning("%s", error->message);
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g_error_free(error);
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data->unsupported = true;
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return;
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}
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data->frame_size = audio_format_frame_size(&data->audio_format);
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if (data->total_frames == 0)
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data->total_frames = stream_info->total_samples;
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data->initialized = true;
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}
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void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
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struct flac_data *data)
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{
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if (data->unsupported)
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return;
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struct replay_gain_info rgi;
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char *mixramp_start;
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char *mixramp_end;
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switch (block->type) {
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case FLAC__METADATA_TYPE_STREAMINFO:
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flac_got_stream_info(data, &block->data.stream_info);
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break;
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case FLAC__METADATA_TYPE_VORBIS_COMMENT:
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if (flac_parse_replay_gain(&rgi, block))
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decoder_replay_gain(data->decoder, &rgi);
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if (flac_parse_mixramp(&mixramp_start, &mixramp_end, block))
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decoder_mixramp(data->decoder,
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mixramp_start, mixramp_end);
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if (data->tag != nullptr)
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flac_vorbis_comments_to_tag(data->tag,
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&block->data.vorbis_comment);
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default:
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break;
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}
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}
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/**
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* This function attempts to call decoder_initialized() in case there
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* was no STREAMINFO block. This is allowed for nonseekable streams,
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* where the server sends us only a part of the file, without
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* providing the STREAMINFO block from the beginning of the file
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* (e.g. when seeking with SqueezeBox Server).
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*/
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static bool
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flac_got_first_frame(struct flac_data *data, const FLAC__FrameHeader *header)
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{
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if (data->unsupported)
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return false;
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GError *error = nullptr;
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if (!audio_format_init_checked(&data->audio_format,
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header->sample_rate,
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flac_sample_format(header->bits_per_sample),
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header->channels, &error)) {
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g_warning("%s", error->message);
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g_error_free(error);
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data->unsupported = true;
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return false;
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}
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data->frame_size = audio_format_frame_size(&data->audio_format);
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decoder_initialized(data->decoder, &data->audio_format,
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data->input_stream->seekable,
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(float)data->total_frames /
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(float)data->audio_format.sample_rate);
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data->initialized = true;
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return true;
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}
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FLAC__StreamDecoderWriteStatus
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flac_common_write(struct flac_data *data, const FLAC__Frame * frame,
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const FLAC__int32 *const buf[],
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FLAC__uint64 nbytes)
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{
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enum decoder_command cmd;
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void *buffer;
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unsigned bit_rate;
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if (!data->initialized && !flac_got_first_frame(data, &frame->header))
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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size_t buffer_size = frame->header.blocksize * data->frame_size;
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buffer = data->buffer.Get(buffer_size);
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flac_convert(buffer, frame->header.channels,
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(enum sample_format)data->audio_format.format, buf,
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0, frame->header.blocksize);
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if (nbytes > 0)
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bit_rate = nbytes * 8 * frame->header.sample_rate /
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(1000 * frame->header.blocksize);
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else
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bit_rate = 0;
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cmd = decoder_data(data->decoder, data->input_stream,
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buffer, buffer_size,
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bit_rate);
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data->next_frame += frame->header.blocksize;
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switch (cmd) {
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case DECODE_COMMAND_NONE:
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case DECODE_COMMAND_START:
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break;
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case DECODE_COMMAND_STOP:
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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case DECODE_COMMAND_SEEK:
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return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
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}
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return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
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}
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