/* the Music Player Daemon (MPD)
 * (c)2003-2006 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: http://www.musicpd.org
 *
 * 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
 */

/* TODO 'ogg' should probably be replaced with 'oggvorbis' in all instances */

#include "../inputPlugin.h"

#ifdef HAVE_OGGVORBIS

#include "_ogg_common.h"

#include "../utils.h"
#include "../audio.h"
#include "../log.h"
#include "../pcm_utils.h"
#include "../inputStream.h"
#include "../outputBuffer.h"
#include "../replayGain.h"

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#ifndef HAVE_TREMOR
#include <vorbis/vorbisfile.h>
#else
#include <tremor/ivorbisfile.h>
/* Macros to make Tremor's API look like libogg. Tremor always
   returns host-byte-order 16-bit signed data, and uses integer
   milliseconds where libogg uses double seconds. 
*/
#define ov_read(VF, BUFFER, LENGTH, BIGENDIANP, WORD, SGNED, BITSTREAM) \
        ov_read(VF, BUFFER, LENGTH, BITSTREAM)
#define ov_time_total(VF, I) ((double)ov_time_total(VF, I)/1000)
#define ov_time_tell(VF) ((double)ov_time_tell(VF)/1000)
#define ov_time_seek_page(VF, S) (ov_time_seek_page(VF, (S)*1000))
#endif /* HAVE_TREMOR */

#include <errno.h>

#ifdef WORDS_BIGENDIAN
#define OGG_DECODE_USE_BIGENDIAN	1
#else
#define OGG_DECODE_USE_BIGENDIAN	0
#endif

typedef struct _OggCallbackData {
        InputStream * inStream;
        DecoderControl * dc;
} OggCallbackData;

size_t ogg_read_cb(void * ptr, size_t size, size_t nmemb, void * vdata)
{
	size_t ret = 0;
        OggCallbackData * data = (OggCallbackData *)vdata;

        while(1) {
	        ret = readFromInputStream(data->inStream,ptr,size,nmemb);
                if(ret == 0 && !inputStreamAtEOF(data->inStream) && 
                                !data->dc->stop) 
                {
                        my_usleep(10000);
                }
                else break;
        }
        errno = 0;
	/*if(ret<0) errno = ((InputStream *)inStream)->error;*/

	return ret;
}

int ogg_seek_cb(void * vdata, ogg_int64_t offset, int whence) {
        OggCallbackData * data = (OggCallbackData *)vdata;

	return seekInputStream(data->inStream,offset,whence);
}

int ogg_close_cb(void * vdata) {
        OggCallbackData * data = (OggCallbackData *)vdata;

	return closeInputStream(data->inStream);
}

long ogg_tell_cb(void * vdata) {
        OggCallbackData * data = (OggCallbackData *)vdata;

	return (long)(data->inStream->offset);
}

static char * ogg_parseComment(char * comment, char * needle) {
        int len = strlen(needle);

        if(strncasecmp(comment, needle, len) == 0 && *(comment+len) == '=') {
		return comment+len+1;
	}

        return NULL;
}

void ogg_getReplayGainInfo(char ** comments, ReplayGainInfo ** infoPtr) {
        char * temp;
	int found = 0;

	if(*infoPtr) freeReplayGainInfo(*infoPtr);
	*infoPtr = newReplayGainInfo();

        while(*comments) {
                if((temp = ogg_parseComment(*comments,"replaygain_track_gain"))) 
                {
                        (*infoPtr)->trackGain = atof(temp);
			found = 1;
                }
                else if((temp = ogg_parseComment(*comments,
                                        "replaygain_album_gain"))) 
                {
                        (*infoPtr)->albumGain = atof(temp);
			found = 1;
                }
                else if((temp = ogg_parseComment(*comments,
                                        "replaygain_track_peak"))) 
                {
                        (*infoPtr)->trackPeak = atof(temp);
			found = 1;
                }
                else if((temp = ogg_parseComment(*comments,
                                        "replaygain_album_peak"))) 
                {
                        (*infoPtr)->albumPeak = atof(temp);
			found = 1;
                }

                comments++;
        }

	if(!found) {
		freeReplayGainInfo(*infoPtr);
		*infoPtr = NULL;
	}
}

static const char * VORBIS_COMMENT_TRACK_KEY = "tracknumber";
static const char * VORBIS_COMMENT_DISC_KEY  = "discnumber";

static inline unsigned int ogg_parseCommentAddToTag(char * comment,
		unsigned int itemType, MpdTag ** tag)
{
	const char * needle;
	unsigned int len;
	switch (itemType) {
	case TAG_ITEM_TRACK: needle = VORBIS_COMMENT_TRACK_KEY; break;
	case TAG_ITEM_DISC:  needle = VORBIS_COMMENT_DISC_KEY;  break;
	default:             needle = mpdTagItemKeys[itemType];
	}
	len = strlen(needle);

	if(strncasecmp(comment, needle, len) == 0 && *(comment+len) == '=') {
		if (!*tag)
			*tag = newMpdTag();
		
		addItemToMpdTag(*tag, itemType, comment+len+1);
		
		return 1;
	}
	
	return 0;
}

static MpdTag * oggCommentsParse(char ** comments) {
	MpdTag * tag = NULL;
	
	while(*comments) {
		int j;
		for (j = TAG_NUM_OF_ITEM_TYPES; --j >= 0; ) {
			if (ogg_parseCommentAddToTag(*comments, j, &tag))
				break;
		}
		comments++;
	}
	
	return tag;
}

void putOggCommentsIntoOutputBuffer(OutputBuffer * cb, char * streamName,
		char ** comments) 
{
	MpdTag * tag;

	tag = oggCommentsParse(comments);
	if(!tag && streamName) {
		tag = newMpdTag();
	}
	if(!tag) return;

	/*if(tag->artist) printf("Artist: %s\n", tag->artist);
	if(tag->album) printf("Album: %s\n", tag->album);
	if(tag->track) printf("Track: %s\n", tag->track);
	if(tag->title) printf("Title: %s\n", tag->title);*/

	if(streamName) {
		clearItemsFromMpdTag(tag, TAG_ITEM_NAME);
		addItemToMpdTag(tag, TAG_ITEM_NAME, streamName);
	}

	copyMpdTagToOutputBuffer(cb, tag);

	freeMpdTag(tag);
}

/* public */
int oggvorbis_decode(OutputBuffer * cb, DecoderControl * dc,
		InputStream * inStream)
{
	OggVorbis_File vf;
	ov_callbacks callbacks;
        OggCallbackData data;
	int current_section;
	int prev_section = -1;
	int eof = 0;
	long ret;
#define OGG_CHUNK_SIZE 4096
	char chunk[OGG_CHUNK_SIZE];
	int chunkpos = 0;
	long bitRate = 0;
	long test;
        ReplayGainInfo * replayGainInfo = NULL;
	char ** comments;

        data.inStream = inStream;
        data.dc = dc;

	callbacks.read_func = ogg_read_cb;
	callbacks.seek_func = ogg_seek_cb;
	callbacks.close_func = ogg_close_cb;
	callbacks.tell_func = ogg_tell_cb;
	
	if((ret = ov_open_callbacks(&data, &vf, NULL, 0, callbacks)) < 0) {
		closeInputStream(inStream);
		if(!dc->stop) {
		        ERROR("Error decoding Ogg Vorbis stream: ");
			switch(ret) {
			case OV_EREAD:
				ERROR("read error\n");
				break;
			case OV_ENOTVORBIS:
				ERROR("not vorbis stream\n");
				break;
			case OV_EVERSION:
				ERROR("vorbis version mismatch\n");
				break;
			case OV_EBADHEADER:
				ERROR("invalid vorbis header\n");
				break;
			case OV_EFAULT:
				ERROR("internal logic error\n");
				break;
			default:
				ERROR("unknown error\n");
				break;
			}
                        return -1;
                }
                else {
                        dc->state = DECODE_STATE_STOP;
                        dc->stop = 0;
                }
                return 0;
	}
	
	dc->totalTime = ov_time_total(&vf,-1);
       	if(dc->totalTime < 0) dc->totalTime = 0;

	dc->audioFormat.bits = 16;

	while(!eof) {
		if(dc->seek) {
			if(0 == ov_time_seek_page(&vf,dc->seekWhere)) {
                                clearOutputBuffer(cb);
			        chunkpos = 0;
                        }
                        else dc->seekError = 1;
			dc->seek = 0;
		}
		ret = ov_read(&vf, chunk+chunkpos, 
				OGG_CHUNK_SIZE-chunkpos,
				OGG_DECODE_USE_BIGENDIAN,
				2, 1, &current_section);

		if(current_section!=prev_section) {
			/*printf("new song!\n");*/
			vorbis_info *vi=ov_info(&vf,-1);
			dc->audioFormat.channels = vi->channels;
			dc->audioFormat.sampleRate = vi->rate;
			if(dc->state == DECODE_STATE_START) {
        			getOutputAudioFormat(&(dc->audioFormat),
					&(cb->audioFormat));
				dc->state = DECODE_STATE_DECODE;
			}
			comments = ov_comment(&vf, -1)->user_comments;
			putOggCommentsIntoOutputBuffer(cb, inStream->metaName,
					comments);
        		ogg_getReplayGainInfo(comments, &replayGainInfo);
		}

		prev_section = current_section;

		if(ret <= 0 && ret != OV_HOLE) {
			eof = 1;
			break;
		}
                if(ret == OV_HOLE) ret = 0;

		chunkpos+=ret;

		if(chunkpos >= OGG_CHUNK_SIZE) {
			if((test = ov_bitrate_instant(&vf))>0) {
				bitRate = test/1000;
			}
			sendDataToOutputBuffer(cb, inStream, dc, 
						inStream->seekable,  
                                        	chunk, chunkpos, 
						ov_pcm_tell(&vf)/
						dc->audioFormat.sampleRate,
						bitRate,
						replayGainInfo);
			chunkpos = 0;
			if(dc->stop) break;
		}
	}

	if(!dc->stop && chunkpos > 0) {
		sendDataToOutputBuffer(cb, NULL, dc, inStream->seekable,
				chunk, chunkpos,
				ov_time_tell(&vf), bitRate, replayGainInfo);
	}

	if(replayGainInfo) freeReplayGainInfo(replayGainInfo);

	ov_clear(&vf);

	flushOutputBuffer(cb);

	if(dc->stop) {
		dc->state = DECODE_STATE_STOP;
		dc->stop = 0;
	}
	else dc->state = DECODE_STATE_STOP;

	return 0;
}

MpdTag * oggvorbis_TagDup(char * file) {
	MpdTag * ret = NULL;
	FILE * fp;
	OggVorbis_File vf;

	fp = fopen(file,"r"); 
	if(!fp)
	{
		DEBUG("oggTagDup: Failed to open file: '%s', %s\n", file, strerror(errno));
		 return NULL;
	}
	if(ov_open(fp,&vf,NULL,0)<0) {
		fclose(fp);
		return NULL;
	}

	ret = oggCommentsParse(ov_comment(&vf,-1)->user_comments);

	if(!ret) ret = newMpdTag();
	ret->time = (int)(ov_time_total(&vf,-1)+0.5);

	ov_clear(&vf);

	return ret;	
}

static unsigned int oggvorbis_try_decode(InputStream * inStream)
{
	return (ogg_stream_type_detect(inStream) == VORBIS) ? 1 : 0;
}


static char * oggvorbis_Suffixes[] = {"ogg", NULL};
static char * oggvorbis_MimeTypes[] = {"application/ogg", NULL};

InputPlugin oggvorbisPlugin =
{
	"oggvorbis",
	NULL,
	NULL,
	oggvorbis_try_decode,
	oggvorbis_decode,
	NULL,
	oggvorbis_TagDup,
	INPUT_PLUGIN_STREAM_URL | INPUT_PLUGIN_STREAM_FILE,
	oggvorbis_Suffixes,
	oggvorbis_MimeTypes
};

#else /* !HAVE_OGGVORBIS */

InputPlugin oggvorbisPlugin =
{
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	0,
	NULL,
	NULL,
};

#endif /* HAVE_OGGVORBIS */