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