blob: 572471586d3bfb416f30ee85b40c5b79e7891b8b
1 | /* |
2 | * Copyright (c) 2004 Roman Shaposhnik |
3 | * Copyright (c) 2008 Alexander Strange (astrange@ithinksw.com) |
4 | * |
5 | * Many thanks to Steven M. Schultz for providing clever ideas and |
6 | * to Michael Niedermayer <michaelni@gmx.at> for writing initial |
7 | * implementation. |
8 | * |
9 | * This file is part of FFmpeg. |
10 | * |
11 | * FFmpeg is free software; you can redistribute it and/or |
12 | * modify it under the terms of the GNU Lesser General Public |
13 | * License as published by the Free Software Foundation; either |
14 | * version 2.1 of the License, or (at your option) any later version. |
15 | * |
16 | * FFmpeg is distributed in the hope that it will be useful, |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
19 | * Lesser General Public License for more details. |
20 | * |
21 | * You should have received a copy of the GNU Lesser General Public |
22 | * License along with FFmpeg; if not, write to the Free Software |
23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
24 | */ |
25 | |
26 | /** |
27 | * @file |
28 | * Multithreading support functions |
29 | * @see doc/multithreading.txt |
30 | */ |
31 | |
32 | #include "avcodec.h" |
33 | #include "internal.h" |
34 | #include "pthread_internal.h" |
35 | #include "thread.h" |
36 | |
37 | /** |
38 | * Set the threading algorithms used. |
39 | * |
40 | * Threading requires more than one thread. |
41 | * Frame threading requires entire frames to be passed to the codec, |
42 | * and introduces extra decoding delay, so is incompatible with low_delay. |
43 | * |
44 | * @param avctx The context. |
45 | */ |
46 | static void validate_thread_parameters(AVCodecContext *avctx) |
47 | { |
48 | int frame_threading_supported = (avctx->codec->capabilities & AV_CODEC_CAP_FRAME_THREADS) |
49 | && !(avctx->flags & AV_CODEC_FLAG_TRUNCATED) |
50 | && !(avctx->flags & AV_CODEC_FLAG_LOW_DELAY) |
51 | && !(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS); |
52 | if (avctx->thread_count == 1) { |
53 | avctx->active_thread_type = 0; |
54 | } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) { |
55 | avctx->active_thread_type = FF_THREAD_FRAME; |
56 | } else if (avctx->codec->capabilities & AV_CODEC_CAP_SLICE_THREADS && |
57 | avctx->thread_type & FF_THREAD_SLICE) { |
58 | avctx->active_thread_type = FF_THREAD_SLICE; |
59 | } else if (!(avctx->codec->capabilities & AV_CODEC_CAP_AUTO_THREADS)) { |
60 | avctx->thread_count = 1; |
61 | avctx->active_thread_type = 0; |
62 | } |
63 | |
64 | if (avctx->thread_count > MAX_AUTO_THREADS) |
65 | av_log(avctx, AV_LOG_WARNING, |
66 | "Application has requested %d threads. Using a thread count greater than %d is not recommended.\n", |
67 | avctx->thread_count, MAX_AUTO_THREADS); |
68 | } |
69 | |
70 | int ff_thread_init(AVCodecContext *avctx) |
71 | { |
72 | validate_thread_parameters(avctx); |
73 | |
74 | if (avctx->active_thread_type&FF_THREAD_SLICE) |
75 | return ff_slice_thread_init(avctx); |
76 | else if (avctx->active_thread_type&FF_THREAD_FRAME) |
77 | return ff_frame_thread_init(avctx); |
78 | |
79 | return 0; |
80 | } |
81 | |
82 | void ff_thread_free(AVCodecContext *avctx) |
83 | { |
84 | if (avctx->active_thread_type&FF_THREAD_FRAME) |
85 | ff_frame_thread_free(avctx, avctx->thread_count); |
86 | else |
87 | ff_slice_thread_free(avctx); |
88 | } |
89 |