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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 & CODEC_CAP_FRAME_THREADS) | |
49 | && !(avctx->flags & CODEC_FLAG_TRUNCATED) | |
50 | && !(avctx->flags & CODEC_FLAG_LOW_DELAY) | |
51 | && !(avctx->flags2 & 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 & 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 & 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 | } |