FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/fftools/thread_queue.c
Date: 2022-10-02 18:56:10
Exec Total Coverage
Lines: 88 104 84.6%
Branches: 34 48 70.8%

Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <stdint.h>
20 #include <string.h>
21
22 #include "libavutil/avassert.h"
23 #include "libavutil/error.h"
24 #include "libavutil/fifo.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/mem.h"
27 #include "libavutil/thread.h"
28
29 #include "objpool.h"
30 #include "thread_queue.h"
31
32 enum {
33 FINISHED_SEND = (1 << 0),
34 FINISHED_RECV = (1 << 1),
35 };
36
37 typedef struct FifoElem {
38 void *obj;
39 unsigned int stream_idx;
40 } FifoElem;
41
42 struct ThreadQueue {
43 int *finished;
44 unsigned int nb_streams;
45
46 AVFifo *fifo;
47
48 ObjPool *obj_pool;
49 void (*obj_move)(void *dst, void *src);
50
51 pthread_mutex_t lock;
52 pthread_cond_t cond;
53 };
54
55 6422 void tq_free(ThreadQueue **ptq)
56 {
57 6422 ThreadQueue *tq = *ptq;
58
59
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6422 if (!tq)
60 return;
61
62
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6422 if (tq->fifo) {
63 FifoElem elem;
64
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6422 while (av_fifo_read(tq->fifo, &elem, 1) >= 0)
65 objpool_release(tq->obj_pool, &elem.obj);
66 }
67 6422 av_fifo_freep2(&tq->fifo);
68
69 6422 objpool_free(&tq->obj_pool);
70
71 6422 av_freep(&tq->finished);
72
73 6422 pthread_cond_destroy(&tq->cond);
74 6422 pthread_mutex_destroy(&tq->lock);
75
76 6422 av_freep(ptq);
77 }
78
79 6422 ThreadQueue *tq_alloc(unsigned int nb_streams, size_t queue_size,
80 ObjPool *obj_pool, void (*obj_move)(void *dst, void *src))
81 {
82 ThreadQueue *tq;
83 int ret;
84
85 6422 tq = av_mallocz(sizeof(*tq));
86
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6422 if (!tq)
87 return NULL;
88
89 6422 ret = pthread_cond_init(&tq->cond, NULL);
90
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6422 if (ret) {
91 av_freep(&tq);
92 return NULL;
93 }
94
95 6422 ret = pthread_mutex_init(&tq->lock, NULL);
96
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6422 if (ret) {
97 pthread_cond_destroy(&tq->cond);
98 av_freep(&tq);
99 return NULL;
100 }
101
102 6422 tq->finished = av_calloc(nb_streams, sizeof(*tq->finished));
103
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6422 if (!tq->finished)
104 goto fail;
105 6422 tq->nb_streams = nb_streams;
106
107 6422 tq->fifo = av_fifo_alloc2(queue_size, sizeof(FifoElem), 0);
108
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6422 if (!tq->fifo)
109 goto fail;
110
111 6422 tq->obj_pool = obj_pool;
112 6422 tq->obj_move = obj_move;
113
114 6422 return tq;
115 fail:
116 tq_free(&tq);
117 return NULL;
118 }
119
120 478379 int tq_send(ThreadQueue *tq, unsigned int stream_idx, void *data)
121 {
122 int *finished;
123 int ret;
124
125
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478379 av_assert0(stream_idx < tq->nb_streams);
126 478379 finished = &tq->finished[stream_idx];
127
128 478379 pthread_mutex_lock(&tq->lock);
129
130
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478379 if (*finished & FINISHED_SEND) {
131 ret = AVERROR(EINVAL);
132 goto finish;
133 }
134
135
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512203 while (!(*finished & FINISHED_RECV) && !av_fifo_can_write(tq->fifo))
136 33824 pthread_cond_wait(&tq->cond, &tq->lock);
137
138
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478379 if (*finished & FINISHED_RECV) {
139 12 ret = AVERROR_EOF;
140 12 *finished |= FINISHED_SEND;
141 } else {
142 478367 FifoElem elem = { .stream_idx = stream_idx };
143
144 478367 ret = objpool_get(tq->obj_pool, &elem.obj);
145
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478367 if (ret < 0)
146 goto finish;
147
148 478367 tq->obj_move(elem.obj, data);
149
150 478367 ret = av_fifo_write(tq->fifo, &elem, 1);
151
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478367 av_assert0(ret >= 0);
152 478367 pthread_cond_broadcast(&tq->cond);
153 }
154
155 478379 finish:
156 478379 pthread_mutex_unlock(&tq->lock);
157
158 478379 return ret;
159 }
160
161 900858 static int receive_locked(ThreadQueue *tq, int *stream_idx,
162 void *data)
163 {
164 FifoElem elem;
165 900858 unsigned int nb_finished = 0;
166
167
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900858 if (av_fifo_read(tq->fifo, &elem, 1) >= 0) {
168 478367 tq->obj_move(data, elem.obj);
169 478367 objpool_release(tq->obj_pool, &elem.obj);
170 478367 *stream_idx = elem.stream_idx;
171 478367 return 0;
172 }
173
174
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863390 for (unsigned int i = 0; i < tq->nb_streams; i++) {
175
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447552 if (!(tq->finished[i] & FINISHED_SEND))
176 433511 continue;
177
178 /* return EOF to the consumer at most once for each stream */
179
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14041 if (!(tq->finished[i] & FINISHED_RECV)) {
180 6653 tq->finished[i] |= FINISHED_RECV;
181 6653 *stream_idx = i;
182 6653 return AVERROR_EOF;
183 }
184
185 7388 nb_finished++;
186 }
187
188
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415838 return nb_finished == tq->nb_streams ? AVERROR_EOF : AVERROR(EAGAIN);
189 }
190
191 491442 int tq_receive(ThreadQueue *tq, int *stream_idx, void *data)
192 {
193 int ret;
194
195 491442 *stream_idx = -1;
196
197 491442 pthread_mutex_lock(&tq->lock);
198
199 while (1) {
200 900858 ret = receive_locked(tq, stream_idx, data);
201
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900858 if (ret == AVERROR(EAGAIN)) {
202 409416 pthread_cond_wait(&tq->cond, &tq->lock);
203 409416 continue;
204 }
205
206 491442 break;
207 }
208
209
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491442 if (ret == 0)
210 478367 pthread_cond_broadcast(&tq->cond);
211
212 491442 pthread_mutex_unlock(&tq->lock);
213
214 491442 return ret;
215 }
216
217 16341 void tq_send_finish(ThreadQueue *tq, unsigned int stream_idx)
218 {
219
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16341 av_assert0(stream_idx < tq->nb_streams);
220
221 16341 pthread_mutex_lock(&tq->lock);
222
223 /* mark the stream as send-finished;
224 * next time the consumer thread tries to read this stream it will get
225 * an EOF and recv-finished flag will be set */
226 16341 tq->finished[stream_idx] |= FINISHED_SEND;
227 16341 pthread_cond_broadcast(&tq->cond);
228
229 16341 pthread_mutex_unlock(&tq->lock);
230 16341 }
231
232 6700 void tq_receive_finish(ThreadQueue *tq, unsigned int stream_idx)
233 {
234
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6700 av_assert0(stream_idx < tq->nb_streams);
235
236 6700 pthread_mutex_lock(&tq->lock);
237
238 /* mark the stream as recv-finished;
239 * next time the producer thread tries to send for this stream, it will
240 * get an EOF and send-finished flag will be set */
241 6700 tq->finished[stream_idx] |= FINISHED_RECV;
242 6700 pthread_cond_broadcast(&tq->cond);
243
244 6700 pthread_mutex_unlock(&tq->lock);
245 6700 }
246