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https://github.com/claunia/flac.git
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major plugin revamp based on x-fixer's code
This commit is contained in:
Josh Coalson
292
src/plugin_winamp2/playback.c
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292
src/plugin_winamp2/playback.c
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@@ -0,0 +1,292 @@
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/* in_flac - Winamp2 FLAC input plugin
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* Copyright (C) 2000,2001,2002,2003,2004 Josh Coalson
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include "playback.h"
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#include "share/grabbag.h"
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static FLAC__int32 reservoir_[FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS][FLAC__MAX_BLOCK_SIZE * 2/*for overflow*/];
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static FLAC__int32 *reservoir__[FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS] = { reservoir_[0], reservoir_[1] }; /*@@@ kind of a hard-coded hack */
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static unsigned wide_samples_in_reservoir_;
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static output_config_t cfg; /* local copy */
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static unsigned bh_index_last_w, bh_index_last_o, written_time_last;
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static FLAC__int64 decode_position, decode_position_last;
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/*
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* callbacks
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*/
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static FLAC__StreamDecoderWriteStatus write_callback(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
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{
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file_info_struct *file_info = (file_info_struct*)client_data;
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const unsigned channels = file_info->channels, wide_samples = frame->header.blocksize;
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unsigned channel;
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(void)decoder;
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if (file_info->abort_flag)
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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for (channel = 0; channel < channels; channel++)
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memcpy(&reservoir_[channel][wide_samples_in_reservoir_], buffer[channel], sizeof(buffer[0][0]) * wide_samples);
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wide_samples_in_reservoir_ += wide_samples;
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return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
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}
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static void metadata_callback(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
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{
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file_info_struct *file_info = (file_info_struct*)client_data;
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(void)decoder;
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if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO)
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{
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FLAC__ASSERT(metadata->data.stream_info.total_samples < 0x100000000); /* this plugin can only handle < 4 gigasamples */
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file_info->total_samples = (unsigned)(metadata->data.stream_info.total_samples&0xfffffffful);
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file_info->bits_per_sample = metadata->data.stream_info.bits_per_sample;
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file_info->channels = metadata->data.stream_info.channels;
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file_info->sample_rate = metadata->data.stream_info.sample_rate;
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if (file_info->bits_per_sample!=8 && file_info->bits_per_sample!=16 && file_info->bits_per_sample!=24)
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{
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FLAC_plugin__show_error("This plugin can only handle 8/16/24-bit samples.");
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file_info->abort_flag = true;
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return;
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}
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file_info->length_in_msec = file_info->total_samples * 10 / (file_info->sample_rate / 100);
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}
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else if (metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT)
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{
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double gain, peak;
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if (grabbag__replaygain_load_from_vorbiscomment(metadata, cfg.replaygain.album_mode, &gain, &peak))
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{
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file_info->has_replaygain = true;
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file_info->replay_scale = grabbag__replaygain_compute_scale_factor(peak, gain, (double)cfg.replaygain.preamp, !cfg.replaygain.hard_limit);
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}
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}
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}
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static void error_callback(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
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{
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file_info_struct *file_info = (file_info_struct*)client_data;
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(void)decoder;
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if (cfg.misk.stop_err || status!=FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
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file_info->abort_flag = true;
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}
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/*
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* init/delete
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*/
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FLAC__bool FLAC_plugin__decoder_init(FLAC__FileDecoder *decoder, const char *filename, FLAC__int64 filesize, file_info_struct *file_info, output_config_t *config)
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{
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FLAC__ASSERT(decoder);
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FLAC_plugin__decoder_finish(decoder);
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/* init decoder */
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FLAC__file_decoder_set_md5_checking(decoder, false);
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FLAC__file_decoder_set_filename(decoder, filename);
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FLAC__file_decoder_set_metadata_ignore_all(decoder);
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FLAC__file_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
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FLAC__file_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
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FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback);
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FLAC__file_decoder_set_write_callback(decoder, write_callback);
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FLAC__file_decoder_set_error_callback(decoder, error_callback);
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FLAC__file_decoder_set_client_data(decoder, file_info);
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if (FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK)
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{
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FLAC_plugin__show_error("Error while initializing decoder (%s).", FLAC__FileDecoderStateString[FLAC__file_decoder_get_state(decoder)]);
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return false;
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}
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/* process */
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cfg = *config;
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wide_samples_in_reservoir_ = 0;
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file_info->is_playing = false;
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file_info->abort_flag = false;
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file_info->has_replaygain = false;
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if (!FLAC__file_decoder_process_until_end_of_metadata(decoder))
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{
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FLAC_plugin__show_error("Error while processing metadata (%s).", FLAC__FileDecoderStateString[FLAC__file_decoder_get_state(decoder)]);
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return false;
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}
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/* check results */
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if (file_info->abort_flag) return false; /* metadata callback already popped up the error dialog */
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/* init replaygain */
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file_info->output_bits_per_sample = file_info->has_replaygain && cfg.replaygain.enable ?
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cfg.resolution.replaygain.bps_out :
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cfg.resolution.normal.dither_24_to_16 ? min(file_info->bits_per_sample, 16) : file_info->bits_per_sample;
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if (file_info->has_replaygain && cfg.replaygain.enable && cfg.resolution.replaygain.dither)
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FLAC__replaygain_synthesis__init_dither_context(&file_info->dither_context, file_info->bits_per_sample, cfg.resolution.replaygain.noise_shaping);
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/* more inits */
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file_info->eof = false;
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file_info->seek_to = -1;
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file_info->is_playing = true;
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file_info->average_bps = (unsigned)(filesize / (125.*file_info->total_samples/file_info->sample_rate));
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bh_index_last_w = 0;
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bh_index_last_o = BITRATE_HIST_SIZE;
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decode_position = 0;
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decode_position_last = 0;
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written_time_last = 0;
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return true;
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}
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void FLAC_plugin__decoder_finish(FLAC__FileDecoder *decoder)
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{
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if (decoder && FLAC__file_decoder_get_state(decoder)!=FLAC__FILE_DECODER_UNINITIALIZED)
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FLAC__file_decoder_finish(decoder);
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}
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void FLAC_plugin__decoder_delete(FLAC__FileDecoder *decoder)
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{
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if (decoder)
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{
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FLAC_plugin__decoder_finish(decoder);
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FLAC__file_decoder_delete(decoder);
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}
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}
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/*
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* decode
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*/
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int FLAC_plugin__seek(FLAC__FileDecoder *decoder, file_info_struct *file_info)
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{
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int pos;
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const FLAC__uint64 target_sample =
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(FLAC__uint64)file_info->total_samples*file_info->seek_to / file_info->length_in_msec;
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if (!FLAC__file_decoder_seek_absolute(decoder, target_sample))
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return -1;
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file_info->seek_to = -1;
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file_info->eof = false;
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wide_samples_in_reservoir_ = 0;
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pos = (int)(target_sample*1000 / file_info->sample_rate);
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bh_index_last_o = bh_index_last_w = (pos/BITRATE_HIST_SEGMENT_MSEC) % BITRATE_HIST_SIZE;
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if (!FLAC__file_decoder_get_decode_position(decoder, &decode_position))
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decode_position = 0;
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return pos;
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}
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unsigned FLAC_plugin__decode(FLAC__FileDecoder *decoder, file_info_struct *file_info, char *sample_buffer)
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{
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/* fill reservoir */
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while (wide_samples_in_reservoir_ < SAMPLES_PER_WRITE)
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{
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if (FLAC__file_decoder_get_state(decoder) == FLAC__FILE_DECODER_END_OF_FILE)
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{
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file_info->eof = true;
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break;
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}
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else if (!FLAC__file_decoder_process_single(decoder))
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{
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FLAC_plugin__show_error("Error while processing frame (%s).", FLAC__FileDecoderStateString[FLAC__file_decoder_get_state(decoder)]);
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file_info->eof = true;
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break;
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}
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if (!FLAC__file_decoder_get_decode_position(decoder, &decode_position))
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decode_position = 0;
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}
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/* output samples */
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if (wide_samples_in_reservoir_ > 0)
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{
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const unsigned n = min(wide_samples_in_reservoir_, SAMPLES_PER_WRITE);
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const unsigned channels = file_info->channels;
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unsigned i;
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int bytes;
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if (cfg.replaygain.enable && file_info->has_replaygain)
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{
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bytes = FLAC__replaygain_synthesis__apply_gain(
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sample_buffer,
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true, /* little_endian_data_out */
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file_info->output_bits_per_sample == 8, /* unsigned_data_out */
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reservoir__,
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n,
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channels,
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file_info->bits_per_sample,
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file_info->output_bits_per_sample,
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file_info->replay_scale,
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cfg.replaygain.hard_limit,
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cfg.resolution.replaygain.dither,
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&file_info->dither_context
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);
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}
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else
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{
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bytes = FLAC__plugin_common__pack_pcm_signed_little_endian(
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sample_buffer,
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reservoir__,
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n,
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channels,
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file_info->bits_per_sample,
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file_info->output_bits_per_sample
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);
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}
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wide_samples_in_reservoir_ -= n;
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for (i = 0; i < channels; i++)
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memmove(&reservoir_[i][0], &reservoir_[i][n], sizeof(reservoir_[0][0]) * wide_samples_in_reservoir_);
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return bytes;
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}
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else
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{
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file_info->eof = true;
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return 0;
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}
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}
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int FLAC_plugin__get_rate(unsigned written_time, unsigned output_time, file_info_struct *file_info)
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{
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static int bitrate_history_[BITRATE_HIST_SIZE];
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unsigned bh_index_w = (written_time/BITRATE_HIST_SEGMENT_MSEC) % BITRATE_HIST_SIZE;
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unsigned bh_index_o = (output_time/BITRATE_HIST_SEGMENT_MSEC) % BITRATE_HIST_SIZE;
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/* written bitrate */
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if (bh_index_w != bh_index_last_w)
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{
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bitrate_history_[(bh_index_w + BITRATE_HIST_SIZE-1)%BITRATE_HIST_SIZE] =
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decode_position>decode_position_last && written_time > written_time_last ?
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(unsigned)(8000*(decode_position - decode_position_last)/(written_time - written_time_last)) :
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file_info->average_bps;
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bh_index_last_w = bh_index_w;
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written_time_last = written_time;
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decode_position_last = decode_position;
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}
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/* output bitrate */
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if (bh_index_o!=bh_index_last_o && bh_index_o!=bh_index_last_w)
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{
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bh_index_last_o = bh_index_o;
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return bitrate_history_[bh_index_o];
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}
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return 0;
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}
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