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/* in_flac - Winamp2 FLAC input plugin
* Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007 Josh Coalson
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <limits.h> /* for INT_MAX */
#include <stdlib.h>
#include <string.h> /* for memmove() */
#include "playback.h"
#include "share/grabbag.h"
static FLAC__int32 reservoir_[FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS][FLAC__MAX_BLOCK_SIZE * 2/*for overflow*/];
static FLAC__int32 *reservoir__[FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS] = { reservoir_[0], reservoir_[1] }; /*@@@ kind of a hard-coded hack */
static unsigned wide_samples_in_reservoir_;
static output_config_t cfg; /* local copy */
static unsigned bh_index_last_w, bh_index_last_o, written_time_last;
static FLAC__int64 decode_position, decode_position_last;
/*
* callbacks
*/
static FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
{
stream_data_struct *stream_data = (stream_data_struct*)client_data;
const unsigned channels = stream_data->channels, wide_samples = frame->header.blocksize;
unsigned channel;
(void)decoder;
if (stream_data->abort_flag)
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
for (channel = 0; channel < channels; channel++)
memcpy(&reservoir_[channel][wide_samples_in_reservoir_], buffer[channel], sizeof(buffer[0][0]) * wide_samples);
wide_samples_in_reservoir_ += wide_samples;
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
static void metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
{
stream_data_struct *stream_data = (stream_data_struct*)client_data;
(void)decoder;
if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO)
{
stream_data->total_samples = metadata->data.stream_info.total_samples;
stream_data->bits_per_sample = metadata->data.stream_info.bits_per_sample;
stream_data->channels = metadata->data.stream_info.channels;
stream_data->sample_rate = metadata->data.stream_info.sample_rate;
if (stream_data->bits_per_sample!=8 && stream_data->bits_per_sample!=16 && stream_data->bits_per_sample!=24)
{
FLAC_plugin__show_error("This plugin can only handle 8/16/24-bit samples.");
stream_data->abort_flag = true;
return;
}
{
/* with VC++ you have to spoon feed it the casting from uint64->int64->double */
FLAC__uint64 l = (FLAC__uint64)((double)(FLAC__int64)stream_data->total_samples / (double)stream_data->sample_rate * 1000.0 + 0.5);
if (l > INT_MAX)
l = INT_MAX;
stream_data->length_in_msec = (int)l;
}
}
else if (metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT)
{
double reference, gain, peak;
if (grabbag__replaygain_load_from_vorbiscomment(metadata, cfg.replaygain.album_mode, /*strict=*/false, &reference, &gain, &peak))
{
stream_data->has_replaygain = true;
stream_data->replay_scale = grabbag__replaygain_compute_scale_factor(peak, gain, (double)cfg.replaygain.preamp, !cfg.replaygain.hard_limit);
}
}
}
static void error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
{
stream_data_struct *stream_data = (stream_data_struct*)client_data;
(void)decoder;
if (cfg.misc.stop_err || status!=FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
stream_data->abort_flag = true;
}
/*
* init/delete
*/
FLAC__bool FLAC_plugin__decoder_init(FLAC__StreamDecoder *decoder, const char *filename, FLAC__int64 filesize, stream_data_struct *stream_data, output_config_t *config)
{
FLAC__StreamDecoderInitStatus init_status;
FLAC__ASSERT(decoder);
FLAC_plugin__decoder_finish(decoder);
/* init decoder */
FLAC__stream_decoder_set_md5_checking(decoder, false);
FLAC__stream_decoder_set_metadata_ignore_all(decoder);
FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
if ((init_status = FLAC__stream_decoder_init_file(decoder, filename, write_callback, metadata_callback, error_callback, /*client_data=*/stream_data)) != FLAC__STREAM_DECODER_INIT_STATUS_OK)
{
FLAC_plugin__show_error("Error while initializing decoder (%s [%s]).", FLAC__StreamDecoderInitStatusString[init_status], FLAC__stream_decoder_get_resolved_state_string(decoder));
return false;
}
/* process */
cfg = *config;
wide_samples_in_reservoir_ = 0;
stream_data->is_playing = false;
stream_data->abort_flag = false;
stream_data->has_replaygain = false;
if (!FLAC__stream_decoder_process_until_end_of_metadata(decoder))
{
FLAC_plugin__show_error("Error while processing metadata (%s).", FLAC__stream_decoder_get_resolved_state_string(decoder));
return false;
}
/* check results */
if (stream_data->abort_flag) return false; /* metadata callback already popped up the error dialog */
/* init replaygain */
stream_data->output_bits_per_sample = stream_data->has_replaygain && cfg.replaygain.enable ?
cfg.resolution.replaygain.bps_out :
cfg.resolution.normal.dither_24_to_16 ? min(stream_data->bits_per_sample, 16) : stream_data->bits_per_sample;
if (stream_data->has_replaygain && cfg.replaygain.enable && cfg.resolution.replaygain.dither)
FLAC__replaygain_synthesis__init_dither_context(&stream_data->dither_context, stream_data->bits_per_sample, cfg.resolution.replaygain.noise_shaping);
/* more inits */
stream_data->eof = false;
stream_data->seek_to = -1;
stream_data->is_playing = true;
stream_data->average_bps = (unsigned)(filesize / (125.*(double)(FLAC__int64)stream_data->total_samples/(double)stream_data->sample_rate));
bh_index_last_w = 0;
bh_index_last_o = BITRATE_HIST_SIZE;
decode_position = 0;
decode_position_last = 0;
written_time_last = 0;
return true;
}
void FLAC_plugin__decoder_finish(FLAC__StreamDecoder *decoder)
{
if (decoder && FLAC__stream_decoder_get_state(decoder) != FLAC__STREAM_DECODER_UNINITIALIZED)
(void)FLAC__stream_decoder_finish(decoder);
}
void FLAC_plugin__decoder_delete(FLAC__StreamDecoder *decoder)
{
if (decoder)
{
FLAC_plugin__decoder_finish(decoder);
FLAC__stream_decoder_delete(decoder);
}
}
/*
* decode
*/
int FLAC_plugin__seek(FLAC__StreamDecoder *decoder, stream_data_struct *stream_data)
{
int pos;
FLAC__uint64 target_sample = stream_data->total_samples * stream_data->seek_to / stream_data->length_in_msec;
if (stream_data->total_samples > 0 && target_sample >= stream_data->total_samples && target_sample > 0)
target_sample = stream_data->total_samples - 1;
/* even if the seek fails we have to reset these so that we don't repeat the seek */
stream_data->seek_to = -1;
stream_data->eof = false;
wide_samples_in_reservoir_ = 0;
pos = (int)(target_sample*1000 / stream_data->sample_rate);
if (!FLAC__stream_decoder_seek_absolute(decoder, target_sample)) {
if(FLAC__stream_decoder_get_state(decoder) == FLAC__STREAM_DECODER_SEEK_ERROR)
FLAC__stream_decoder_flush(decoder);
pos = -1;
}
bh_index_last_o = bh_index_last_w = (pos/BITRATE_HIST_SEGMENT_MSEC) % BITRATE_HIST_SIZE;
if (!FLAC__stream_decoder_get_decode_position(decoder, &decode_position))
decode_position = 0;
return pos;
}
unsigned FLAC_plugin__decode(FLAC__StreamDecoder *decoder, stream_data_struct *stream_data, char *sample_buffer)
{
/* fill reservoir */
while (wide_samples_in_reservoir_ < SAMPLES_PER_WRITE)
{
if (FLAC__stream_decoder_get_state(decoder) == FLAC__STREAM_DECODER_END_OF_STREAM)
{
stream_data->eof = true;
break;
}
else if (!FLAC__stream_decoder_process_single(decoder))
{
FLAC_plugin__show_error("Error while processing frame (%s).", FLAC__stream_decoder_get_resolved_state_string(decoder));
stream_data->eof = true;
break;
}
if (!FLAC__stream_decoder_get_decode_position(decoder, &decode_position))
decode_position = 0;
}
/* output samples */
if (wide_samples_in_reservoir_ > 0)
{
const unsigned n = min(wide_samples_in_reservoir_, SAMPLES_PER_WRITE);
const unsigned channels = stream_data->channels;
unsigned i;
int bytes;
if (cfg.replaygain.enable && stream_data->has_replaygain)
{
bytes = FLAC__replaygain_synthesis__apply_gain(
sample_buffer,
true, /* little_endian_data_out */
stream_data->output_bits_per_sample == 8, /* unsigned_data_out */
reservoir__,
n,
channels,
stream_data->bits_per_sample,
stream_data->output_bits_per_sample,
stream_data->replay_scale,
cfg.replaygain.hard_limit,
cfg.resolution.replaygain.dither,
&stream_data->dither_context
);
}
else
{
bytes = FLAC__plugin_common__pack_pcm_signed_little_endian(
sample_buffer,
reservoir__,
n,
channels,
stream_data->bits_per_sample,
stream_data->output_bits_per_sample
);
}
wide_samples_in_reservoir_ -= n;
for (i = 0; i < channels; i++)
memmove(&reservoir_[i][0], &reservoir_[i][n], sizeof(reservoir_[0][0]) * wide_samples_in_reservoir_);
return bytes;
}
else
{
stream_data->eof = true;
return 0;
}
}
int FLAC_plugin__get_rate(unsigned written_time, unsigned output_time, stream_data_struct *stream_data)
{
static int bitrate_history_[BITRATE_HIST_SIZE];
unsigned bh_index_w = (written_time/BITRATE_HIST_SEGMENT_MSEC) % BITRATE_HIST_SIZE;
unsigned bh_index_o = (output_time/BITRATE_HIST_SEGMENT_MSEC) % BITRATE_HIST_SIZE;
/* written bitrate */
if (bh_index_w != bh_index_last_w)
{
bitrate_history_[(bh_index_w + BITRATE_HIST_SIZE-1)%BITRATE_HIST_SIZE] =
decode_position>decode_position_last && written_time > written_time_last ?
(unsigned)(8000*(decode_position - decode_position_last)/(written_time - written_time_last)) :
stream_data->average_bps;
bh_index_last_w = bh_index_w;
written_time_last = written_time;
decode_position_last = decode_position;
}
/* output bitrate */
if (bh_index_o!=bh_index_last_o && bh_index_o!=bh_index_last_w)
{
bh_index_last_o = bh_index_o;
return bitrate_history_[bh_index_o];
}
return 0;
}
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