plugin.c

这是著名的TCPMP播放器在WINDWOWS,和WINCE下编译通过的源程序.笔者对其中的LIBMAD库做了针对ARM MPU的优化. 并增加了词幕功能.

/* libxmms-flac - XMMS FLAC input plugin
 * Copyright (C) 2000,2001,2002,2003,2004,2005  Josh Coalson
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <glib.h>
#include <pwd.h>
#include <sys/types.h>
#include <unistd.h>

#include <xmms/plugin.h>
#include <xmms/util.h>
#include <xmms/configfile.h>
#include <xmms/titlestring.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef HAVE_LANGINFO_CODESET
#include <langinfo.h>
#endif

#include "FLAC/all.h"
#include "plugin_common/all.h"
#include "share/grabbag.h"
#include "share/replaygain_synthesis.h"
#include "configure.h"
#include "charset.h"
#include "http.h"
#include "tag.h"

#ifdef min
#undef min
#endif
#define min(x,y) ((x)<(y)?(x):(y))

/* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
#ifdef _MSC_VER
#define FLAC__U64L(x) x
#else
#define FLAC__U64L(x) x##LLU
#endif

extern void FLAC_XMMS__file_info_box(char *filename);

typedef struct {
	FLAC__bool abort_flag;
	FLAC__bool is_playing;
	FLAC__bool eof;
	FLAC__bool play_thread_open; /* if true, is_playing must also be true */
	unsigned total_samples;
	unsigned bits_per_sample;
	unsigned channels;
	unsigned sample_rate;
	unsigned length_in_msec;
	gchar *title;
	AFormat sample_format;
	unsigned sample_format_bytes_per_sample;
	int seek_to_in_sec;
	FLAC__bool has_replaygain;
	double replay_scale;
	DitherContext dither_context;
} file_info_struct;

typedef FLAC__StreamDecoderWriteStatus (*WriteCallback) (const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
typedef void (*MetadataCallback) (const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
typedef void (*ErrorCallback) (const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);

typedef struct {
	FLAC__bool seekable;
	void* (*new_decoder) (void);
	FLAC__bool (*set_md5_checking) (void *decoder, FLAC__bool value);
	FLAC__bool (*set_source) (void *decoder, const char* source);
	FLAC__bool (*set_metadata_ignore_all) (void *decoder);
	FLAC__bool (*set_metadata_respond) (void *decoder, FLAC__MetadataType type);
	FLAC__bool (*set_write_callback) (void *decoder, WriteCallback value);
	FLAC__bool (*set_metadata_callback) (void *decoder, MetadataCallback value);
	FLAC__bool (*set_error_callback) (void *decoder, ErrorCallback value);
	FLAC__bool (*set_client_data) (void *decoder, void *value);
	FLAC__bool (*decoder_init) (void *decoder);
	void (*safe_decoder_finish) (void *decoder);
	void (*safe_decoder_delete) (void *decoder);
	FLAC__bool (*process_until_end_of_metadata) (void *decoder);
	FLAC__bool (*process_single) (void *decoder);
	FLAC__bool (*is_eof) (void *decoder);
} decoder_funcs_t;

#define NUM_DECODER_TYPES 2
typedef enum {
	DECODER_FILE,
	DECODER_HTTP
} decoder_t;

static void FLAC_XMMS__init();
static int  FLAC_XMMS__is_our_file(char *filename);
static void FLAC_XMMS__play_file(char *filename);
static void FLAC_XMMS__stop();
static void FLAC_XMMS__pause(short p);
static void FLAC_XMMS__seek(int time);
static int  FLAC_XMMS__get_time();
static void FLAC_XMMS__cleanup();
static void FLAC_XMMS__get_song_info(char *filename, char **title, int *length);

static void *play_loop_(void *arg);

static FLAC__bool safe_decoder_init_(const char *filename, void **decoderp, decoder_funcs_t const ** fnsp);
static void file_decoder_safe_decoder_finish_(void *decoder);
static void file_decoder_safe_decoder_delete_(void *decoder);
static FLAC__StreamDecoderWriteStatus write_callback_(const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
static void metadata_callback_(const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
static void error_callback_(const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);

static void init_decoder_func_tables();
static decoder_t source_to_decoder_type (const char *source);

InputPlugin flac_ip =
{
	NULL,
	NULL,
	"FLAC Player v" VERSION,
	FLAC_XMMS__init,
	FLAC_XMMS__aboutbox,
	FLAC_XMMS__configure,
	FLAC_XMMS__is_our_file,
	NULL,
	FLAC_XMMS__play_file,
	FLAC_XMMS__stop,
	FLAC_XMMS__pause,
	FLAC_XMMS__seek,
	NULL,
	FLAC_XMMS__get_time,
	NULL,
	NULL,
	FLAC_XMMS__cleanup,
	NULL,
	NULL,
	NULL,
	NULL,
	FLAC_XMMS__get_song_info,
	FLAC_XMMS__file_info_box,
	NULL
};

#define SAMPLES_PER_WRITE 512
#define SAMPLE_BUFFER_SIZE ((FLAC__MAX_BLOCK_SIZE + SAMPLES_PER_WRITE) * FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS * (24/8))
static FLAC__byte sample_buffer_[SAMPLE_BUFFER_SIZE];
static unsigned sample_buffer_first_, sample_buffer_last_;

static void *decoder_ = 0;
static file_info_struct file_info_;
static pthread_t decode_thread_;
static FLAC__bool audio_error_ = false;
static FLAC__bool is_big_endian_host_;

#define BITRATE_HIST_SEGMENT_MSEC 500
/* 500ms * 50 = 25s should be enough */
#define BITRATE_HIST_SIZE 50
static unsigned bitrate_history_[BITRATE_HIST_SIZE];

/* A table of sets of decoder functions, indexed by decoder_t */
static const decoder_funcs_t* DECODER_FUNCS[NUM_DECODER_TYPES];

static decoder_funcs_t const * decoder_func_table_;


InputPlugin *get_iplugin_info()
{
	flac_ip.description = g_strdup_printf("Reference FLAC Player v%s", FLAC__VERSION_STRING);
	return &flac_ip;
}

void set_track_info(const char* title, int length_in_msec)
{
	if (file_info_.is_playing) {
		flac_ip.set_info((char*) title, length_in_msec, file_info_.sample_rate * file_info_.channels * file_info_.bits_per_sample, file_info_.sample_rate, file_info_.channels);
	}
}

static gchar* homedir()
{
	gchar *result;
	char *env_home = getenv("HOME");
	if (env_home) {
		result = g_strdup (env_home);
	} else {
		uid_t uid = getuid();
		struct passwd *pwent;
		do {
			pwent = getpwent();
		} while (pwent && pwent->pw_uid != uid);
		result = pwent ? g_strdup (pwent->pw_dir) : NULL;
		endpwent();
	}
	return result;
}

void FLAC_XMMS__init()
{
	ConfigFile *cfg;
	FLAC__uint32 test = 1;

	is_big_endian_host_ = (*((FLAC__byte*)(&test)))? false : true;

	flac_cfg.title.tag_override = FALSE;
	g_free(flac_cfg.title.tag_format);
	flac_cfg.title.convert_char_set = FALSE;

	cfg = xmms_cfg_open_default_file();

	/* title */

	xmms_cfg_read_boolean(cfg, "flac", "title.tag_override", &flac_cfg.title.tag_override);

	if(!xmms_cfg_read_string(cfg, "flac", "title.tag_format", &flac_cfg.title.tag_format))
		flac_cfg.title.tag_format = g_strdup("%p - %t");

	xmms_cfg_read_boolean(cfg, "flac", "title.convert_char_set", &flac_cfg.title.convert_char_set);

	if(!xmms_cfg_read_string(cfg, "flac", "title.user_char_set", &flac_cfg.title.user_char_set))
		flac_cfg.title.user_char_set = FLAC_plugin__charset_get_current();

	/* replaygain */

	xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.enable", &flac_cfg.output.replaygain.enable);

	xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.album_mode", &flac_cfg.output.replaygain.album_mode);

	if(!xmms_cfg_read_int(cfg, "flac", "output.replaygain.preamp", &flac_cfg.output.replaygain.preamp))
		flac_cfg.output.replaygain.preamp = 0;

	xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.hard_limit", &flac_cfg.output.replaygain.hard_limit);

	xmms_cfg_read_boolean(cfg, "flac", "output.resolution.normal.dither_24_to_16", &flac_cfg.output.resolution.normal.dither_24_to_16);
	xmms_cfg_read_boolean(cfg, "flac", "output.resolution.replaygain.dither", &flac_cfg.output.resolution.replaygain.dither);

	if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.noise_shaping", &flac_cfg.output.resolution.replaygain.noise_shaping))
		flac_cfg.output.resolution.replaygain.noise_shaping = 1;

	if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.bps_out", &flac_cfg.output.resolution.replaygain.bps_out))
		flac_cfg.output.resolution.replaygain.bps_out = 16;

	/* stream */

	xmms_cfg_read_int(cfg, "flac", "stream.http_buffer_size", &flac_cfg.stream.http_buffer_size);
	xmms_cfg_read_int(cfg, "flac", "stream.http_prebuffer", &flac_cfg.stream.http_prebuffer);
	xmms_cfg_read_boolean(cfg, "flac", "stream.use_proxy", &flac_cfg.stream.use_proxy);
	xmms_cfg_read_string(cfg, "flac", "stream.proxy_host", &flac_cfg.stream.proxy_host);
	xmms_cfg_read_int(cfg, "flac", "stream.proxy_port", &flac_cfg.stream.proxy_port);
	xmms_cfg_read_boolean(cfg, "flac", "stream.proxy_use_auth", &flac_cfg.stream.proxy_use_auth);
	xmms_cfg_read_string(cfg, "flac", "stream.proxy_user", &flac_cfg.stream.proxy_user);
	xmms_cfg_read_string(cfg, "flac", "stream.proxy_pass", &flac_cfg.stream.proxy_pass);
	xmms_cfg_read_boolean(cfg, "flac", "stream.save_http_stream", &flac_cfg.stream.save_http_stream);
	if (!xmms_cfg_read_string(cfg, "flac", "stream.save_http_path", &flac_cfg.stream.save_http_path) ||
		 ! *flac_cfg.stream.save_http_path) {
		if (flac_cfg.stream.save_http_path)
			g_free (flac_cfg.stream.save_http_path);
		flac_cfg.stream.save_http_path = homedir();
	}
	xmms_cfg_read_boolean(cfg, "flac", "stream.cast_title_streaming", &flac_cfg.stream.cast_title_streaming);
	xmms_cfg_read_boolean(cfg, "flac", "stream.use_udp_channel", &flac_cfg.stream.use_udp_channel);

	init_decoder_func_tables();
 	decoder_func_table_ = DECODER_FUNCS [DECODER_FILE];
	decoder_ = decoder_func_table_ -> new_decoder();

	xmms_cfg_free(cfg);
}

int FLAC_XMMS__is_our_file(char *filename)
{
	char *ext;

	ext = strrchr(filename, '.');
	if(ext)
		if(!strcasecmp(ext, ".flac") || !strcasecmp(ext, ".fla"))
			return 1;
	return 0;
}

void FLAC_XMMS__play_file(char *filename)
{
	FILE *f;

	sample_buffer_first_ = sample_buffer_last_ = 0;
	audio_error_ = false;
	file_info_.abort_flag = false;
	file_info_.is_playing = false;
	file_info_.eof = false;
	file_info_.play_thread_open = false;
	file_info_.has_replaygain = false;

	if (source_to_decoder_type (filename) == DECODER_FILE) {
		if(0 == (f = fopen(filename, "r")))
			return;
		fclose(f);
	}

	if(decoder_ == 0)
		return;

	if(!safe_decoder_init_(filename, &decoder_, &decoder_func_table_))
		return;

	if(file_info_.has_replaygain && flac_cfg.output.replaygain.enable) {
		if(flac_cfg.output.resolution.replaygain.bps_out == 8) {
			file_info_.sample_format = FMT_U8;
			file_info_.sample_format_bytes_per_sample = 1;
		}
		else if(flac_cfg.output.resolution.replaygain.bps_out == 16) {
			file_info_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
			file_info_.sample_format_bytes_per_sample = 2;
		}
		else {
			/*@@@ need some error here like wa2: MessageBox(mod_.hMainWindow, "ERROR: plugin can only handle 8/16-bit samples\n", "ERROR: plugin can only handle 8/16-bit samples", 0); */
			fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", flac_cfg.output.resolution.replaygain.bps_out);
			decoder_func_table_ -> safe_decoder_finish(decoder_);
			return;
		}
	}
	else {
		if(file_info_.bits_per_sample == 8) {
			file_info_.sample_format = FMT_U8;
			file_info_.sample_format_bytes_per_sample = 1;
		}
		else if(file_info_.bits_per_sample == 16 || (file_info_.bits_per_sample == 24 && flac_cfg.output.resolution.normal.dither_24_to_16)) {
			file_info_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
			file_info_.sample_format_bytes_per_sample = 2;
		}
		else {
			/*@@@ need some error here like wa2: MessageBox(mod_.hMainWindow, "ERROR: plugin can only handle 8/16-bit samples\n", "ERROR: plugin can only handle 8/16-bit samples", 0); */
			fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", file_info_.bits_per_sample);
			decoder_func_table_ -> safe_decoder_finish(decoder_);
			return;
		}
	}
	FLAC__replaygain_synthesis__init_dither_context(&file_info_.dither_context, file_info_.sample_format_bytes_per_sample * 8, flac_cfg.output.resolution.replaygain.noise_shaping);
	file_info_.is_playing = true;

	if(flac_ip.output->open_audio(file_info_.sample_format, file_info_.sample_rate, file_info_.channels) == 0) {
		audio_error_ = true;
		decoder_func_table_ -> safe_decoder_finish(decoder_);
		return;
	}

	file_info_.title = flac_format_song_title(filename);
	flac_ip.set_info(file_info_.title, file_info_.length_in_msec, file_info_.sample_rate * file_info_.channels * file_info_.bits_per_sample, file_info_.sample_rate, file_info_.channels);

	file_info_.seek_to_in_sec = -1;
	file_info_.play_thread_open = true;
	pthread_create(&decode_thread_, NULL, play_loop_, NULL);
}

void FLAC_XMMS__stop()
{
	if(file_info_.is_playing) {
		file_info_.is_playing = false;
		if(file_info_.play_thread_open) {
			file_info_.play_thread_open = false;
			pthread_join(decode_thread_, NULL);
		}
		flac_ip.output->close_audio();
		decoder_func_table_ -> safe_decoder_finish (decoder_);
	}
}

void FLAC_XMMS__pause(short p)
{
	flac_ip.output->pause(p);
}

void FLAC_XMMS__seek(int time)
{
	if (decoder_func_table_->seekable) {
		file_info_.seek_to_in_sec = time;
		file_info_.eof = false;

		while(file_info_.seek_to_in_sec != -1)
			xmms_usleep(10000);
	}
}

int FLAC_XMMS__get_time()
{
	if(audio_error_)
		return -2;
	if(!file_info_.is_playing || (file_info_.eof && !flac_ip.output->buffer_playing()))
		return -1;
	else
		return flac_ip.output->output_time();
}