samplefmt: add a function for filling a buffer with silence.
[libav.git] / libavcodec / internal.h
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dbbec0c2 1/*
2912e87a 2 * This file is part of Libav.
dbbec0c2 3 *
2912e87a 4 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 9 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 15 * License along with Libav; if not, write to the Free Software
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16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/**
ba87f080 20 * @file
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21 * common internal api header.
22 */
23
24#ifndef AVCODEC_INTERNAL_H
25#define AVCODEC_INTERNAL_H
26
a05aa821 27#include <stdint.h>
f3a29b75 28
91a28b0e 29#include "libavutil/mathematics.h"
f3a29b75 30#include "libavutil/pixfmt.h"
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31#include "avcodec.h"
32
f3a29b75 33typedef struct InternalBuffer {
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34 uint8_t *base[AV_NUM_DATA_POINTERS];
35 uint8_t *data[AV_NUM_DATA_POINTERS];
36 int linesize[AV_NUM_DATA_POINTERS];
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37 int width;
38 int height;
39 enum PixelFormat pix_fmt;
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40 uint8_t **extended_data;
41 int audio_data_size;
42 int nb_channels;
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43} InternalBuffer;
44
45typedef struct AVCodecInternal {
46 /**
47 * internal buffer count
48 * used by default get/release/reget_buffer().
49 */
50 int buffer_count;
51
52 /**
53 * internal buffers
54 * used by default get/release/reget_buffer().
55 */
56 InternalBuffer *buffer;
57
58 /**
59 * Whether the parent AVCodecContext is a copy of the context which had
60 * init() called on it.
61 * This is used by multithreading - shared tables and picture pointers
62 * should be freed from the original context only.
63 */
64 int is_copy;
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65
66#if FF_API_OLD_DECODE_AUDIO
67 /**
68 * Internal sample count used by avcodec_encode_audio() to fabricate pts.
69 * Can be removed along with avcodec_encode_audio().
70 */
71 int sample_count;
72#endif
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73} AVCodecInternal;
74
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75struct AVCodecDefault {
76 const uint8_t *key;
77 const uint8_t *value;
78};
79
dbbec0c2 80/**
49bd8e4b 81 * Determine whether pix_fmt is a hardware accelerated format.
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82 */
83int ff_is_hwaccel_pix_fmt(enum PixelFormat pix_fmt);
84
85/**
49bd8e4b 86 * Return the hardware accelerated codec for codec codec_id and
bf7e799c 87 * pixel format pix_fmt.
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88 *
89 * @param codec_id the codec to match
90 * @param pix_fmt the pixel format to match
91 * @return the hardware accelerated codec, or NULL if none was found.
92 */
93AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat pix_fmt);
94
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95/**
96 * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
97 * If there is no such matching pair then size is returned.
98 */
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99int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
100
0842d589 101unsigned int avpriv_toupper4(unsigned int x);
603a5f04 102
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103int avpriv_lock_avformat(void);
104int avpriv_unlock_avformat(void);
105
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106/**
107 * Maximum size in bytes of extradata.
108 * This value was chosen such that every bit of the buffer is
109 * addressable by a 32-bit signed integer as used by get_bits.
110 */
111#define FF_MAX_EXTRADATA_SIZE ((1 << 28) - FF_INPUT_BUFFER_PADDING_SIZE)
112
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113/**
114 * Check AVPacket size and/or allocate data.
115 *
116 * Encoders supporting AVCodec.encode2() can use this as a convenience to
117 * ensure the output packet data is large enough, whether provided by the user
118 * or allocated in this function.
119 *
120 * @param avpkt the AVPacket
121 * If avpkt->data is already set, avpkt->size is checked
122 * to ensure it is large enough.
123 * If avpkt->data is NULL, a new buffer is allocated.
1a670973 124 * avpkt->size is set to the specified size.
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125 * All other AVPacket fields will be reset with av_init_packet().
126 * @param size the minimum required packet size
127 * @return 0 on success, negative error code on failure
128 */
129int ff_alloc_packet(AVPacket *avpkt, int size);
130
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131/**
132 * Rescale from sample rate to AVCodecContext.time_base.
133 */
134static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
135 int64_t samples)
136{
137 return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
138 avctx->time_base);
139}
140
dbbec0c2 141#endif /* AVCODEC_INTERNAL_H */