aboutsummaryrefslogtreecommitdiffstats
path: root/src/outputBuffer.c
blob: 1db523817ca7cbd5a82c9ca82355ccd45cb5dbec (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 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
 */

#include "outputBuffer.h"

#include "utils.h"
#include "normalize.h"
#include "playerData.h"

void initOutputBuffer(unsigned int size)
{
	assert(size > 0);

	memset(&cb.convState, 0, sizeof(ConvState));
	cb.chunks = xmalloc(size * sizeof(*cb.chunks));
	cb.size = size;
	cb.begin = 0;
	cb.end = 0;
	cb.chunks[0].chunkSize = 0;
}

void output_buffer_free(void)
{
	assert(cb.chunks != NULL);
	free(cb.chunks);
}

void clearOutputBuffer(void)
{
	cb.end = cb.begin;
	cb.chunks[cb.end].chunkSize = 0;
}

/** return the index of the chunk after i */
static inline unsigned successor(unsigned i)
{
	assert(i <= cb.size);

	++i;
	return i == cb.size ? 0 : i;
}

/**
 * Mark the tail chunk as "full" and wake up the player if is waiting
 * for the decoder.
 */
static void output_buffer_expand(unsigned i)
{
	int was_empty = outputBufferEmpty();

	assert(i == (cb.end + 1) % cb.size);
	assert(i != cb.end);

	cb.end = i;
	cb.chunks[i].chunkSize = 0;
	if (was_empty)
		/* if the buffer was empty, the player thread might be
		   waiting for us; wake it up now that another decoded
		   buffer has become available. */
		decoder_wakeup_player();
}

void flushOutputBuffer(void)
{
	OutputBufferChunk *chunk = outputBufferGetChunk(cb.end);

	if (chunk->chunkSize > 0) {
		unsigned int next = successor(cb.end);
		if (next == cb.begin)
			/* all buffers are full; we have to wait for
			   the player to free one, so don't flush
			   right now */
			return;

		output_buffer_expand(next);
	}
}

int outputBufferEmpty(void)
{
	return cb.begin == cb.end;
}

void outputBufferShift(void)
{
	assert(cb.begin != cb.end);
	assert(cb.begin < cb.size);

	cb.begin = successor(cb.begin);
}

unsigned int outputBufferRelative(const unsigned i)
{
	if (i >= cb.begin)
		return i - cb.begin;
	else
		return i + cb.size - cb.begin;
}

unsigned availableOutputBuffer(void)
{
	return outputBufferRelative(cb.end);
}

int outputBufferAbsolute(const unsigned relative)
{
	unsigned i, max;

	max = cb.end;
	if (max < cb.begin)
		max += cb.size;
	i = (unsigned)cb.begin + relative;
	if (i >= max)
		return -1;

	if (i >= cb.size)
		i -= cb.size;

	return (int)i;
}

OutputBufferChunk * outputBufferGetChunk(const unsigned i)
{
	assert(i < cb.size);

	return &cb.chunks[i];
}

/**
 * Return the tail chunk which has room for additional data.  If there
 * is no room in the queue, this function blocks until the player
 * thread has finished playing its current chunk.
 *
 * @return the positive index of the new chunk; OUTPUT_BUFFER_DC_SEEK
 * if another thread requested seeking; OUTPUT_BUFFER_DC_STOP if
 * another thread requested stopping the decoder.
 */
static int tailChunk(InputStream * inStream,
		     int seekable, float data_time, mpd_uint16 bitRate)
{
	unsigned int next;
	OutputBufferChunk *chunk;

	chunk = outputBufferGetChunk(cb.end);
	assert(chunk->chunkSize <= sizeof(chunk->data));
	if (chunk->chunkSize == sizeof(chunk->data)) {
		/* this chunk is full; allocate a new chunk */
		next = successor(cb.end);
		while (cb.begin == next) {
			/* all chunks are full of decoded data; wait
			   for the player to free one */

			if (dc.stop)
				return OUTPUT_BUFFER_DC_STOP;

			if (dc.seek) {
				if (seekable) {
					return OUTPUT_BUFFER_DC_SEEK;
				} else {
					dc.seekError = 1;
					dc.seek = 0;
					decoder_wakeup_player();
				}
			}
			if (!inStream || bufferInputStream(inStream) <= 0) {
				decoder_sleep();
			}
		}

		output_buffer_expand(next);
		chunk = outputBufferGetChunk(next);
		assert(chunk->chunkSize == 0);
	}

	if (chunk->chunkSize == 0) {
		/* if the chunk is empty, nobody has set bitRate and
		   times yet */

		chunk->bitRate = bitRate;
		chunk->times = data_time;
	}

	return cb.end;
}

int sendDataToOutputBuffer(InputStream * inStream,
			   int seekable, void *dataIn,
			   size_t dataInLen, float data_time, mpd_uint16 bitRate,
			   ReplayGainInfo * replayGainInfo)
{
	size_t dataToSend;
	char *data;
	size_t datalen;
	static char *convBuffer;
	static size_t convBufferLen;
	OutputBufferChunk *chunk = NULL;

	if (cmpAudioFormat(&(cb.audioFormat), &(dc.audioFormat)) == 0) {
		data = dataIn;
		datalen = dataInLen;
	} else {
		datalen = pcm_sizeOfConvBuffer(&(dc.audioFormat), dataInLen,
		                               &(cb.audioFormat));
		if (datalen > convBufferLen) {
			if (convBuffer != NULL)
				free(convBuffer);
			convBuffer = xmalloc(datalen);
			convBufferLen = datalen;
		}
		data = convBuffer;
		datalen = pcm_convertAudioFormat(&(dc.audioFormat), dataIn,
		                                 dataInLen, &(cb.audioFormat),
		                                 data, &(cb.convState));
	}

	if (replayGainInfo && (replayGainState != REPLAYGAIN_OFF))
		doReplayGain(replayGainInfo, data, datalen, &cb.audioFormat);
	else if (normalizationEnabled)
		normalizeData(data, datalen, &cb.audioFormat);

	while (datalen) {
		int chunk_index = tailChunk(inStream, seekable,
					    data_time, bitRate);
		if (chunk_index < 0)
			return chunk_index;

		chunk = outputBufferGetChunk(chunk_index);

		dataToSend = sizeof(chunk->data) - chunk->chunkSize;
		if (dataToSend > datalen)
			dataToSend = datalen;

		memcpy(chunk->data + chunk->chunkSize, data, dataToSend);
		chunk->chunkSize += dataToSend;
		datalen -= dataToSend;
		data += dataToSend;
	}

	if (chunk != NULL && chunk->chunkSize == sizeof(chunk->data))
		flushOutputBuffer();

	return 0;
}

void output_buffer_skip(unsigned num)
{
	int i = outputBufferAbsolute(num);
	if (i >= 0)
		cb.begin = i;
}