2 * This file is part of FFmpeg.
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.
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.
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
21 * common internal api header.
24 #ifndef AVCODEC_INTERNAL_H
25 #define AVCODEC_INTERNAL_H
29 #include "libavutil/mathematics.h"
30 #include "libavutil/pixfmt.h"
33 typedef struct InternalBuffer {
34 uint8_t *base[AV_NUM_DATA_POINTERS];
35 uint8_t *data[AV_NUM_DATA_POINTERS];
36 int linesize[AV_NUM_DATA_POINTERS];
39 enum PixelFormat pix_fmt;
40 uint8_t **extended_data;
45 typedef struct AVCodecInternal {
47 * internal buffer count
48 * used by default get/release/reget_buffer().
54 * used by default get/release/reget_buffer().
56 InternalBuffer *buffer;
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.
66 #if FF_API_OLD_DECODE_AUDIO
68 * Internal sample count used by avcodec_encode_audio() to fabricate pts.
69 * Can be removed along with avcodec_encode_audio().
75 * temporary buffer used for encoders to store their bitstream
78 unsigned int byte_buffer_size;
81 struct AVCodecDefault {
87 * Determine whether pix_fmt is a hardware accelerated format.
89 int ff_is_hwaccel_pix_fmt(enum PixelFormat pix_fmt);
92 * Return the hardware accelerated codec for codec codec_id and
93 * pixel format pix_fmt.
95 * @param codec_id the codec to match
96 * @param pix_fmt the pixel format to match
97 * @return the hardware accelerated codec, or NULL if none was found.
99 AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat pix_fmt);
102 * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
103 * If there is no such matching pair then size is returned.
105 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
107 unsigned int avpriv_toupper4(unsigned int x);
110 * does needed setup of pkt_pts/pos and such for (re)get_buffer();
112 void ff_init_buffer_info(AVCodecContext *s, AVFrame *pic);
115 * Remove and free all side data from packet.
117 void ff_packet_free_side_data(AVPacket *pkt);
119 int avpriv_lock_avformat(void);
120 int avpriv_unlock_avformat(void);
123 * Maximum size in bytes of extradata.
124 * This value was chosen such that every bit of the buffer is
125 * addressable by a 32-bit signed integer as used by get_bits.
127 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - FF_INPUT_BUFFER_PADDING_SIZE)
130 * Check AVPacket size and/or allocate data.
132 * Encoders supporting AVCodec.encode2() can use this as a convenience to
133 * ensure the output packet data is large enough, whether provided by the user
134 * or allocated in this function.
136 * @param avctx the AVCodecContext of the encoder
137 * @param avpkt the AVPacket
138 * If avpkt->data is already set, avpkt->size is checked
139 * to ensure it is large enough.
140 * If avpkt->data is NULL, a new buffer is allocated.
141 * avpkt->size is set to the specified size.
142 * All other AVPacket fields will be reset with av_init_packet().
143 * @param size the minimum required packet size
144 * @return 0 on success, negative error code on failure
146 int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int size);
148 int ff_alloc_packet(AVPacket *avpkt, int size);
151 * Rescale from sample rate to AVCodecContext.time_base.
153 static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
156 return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
160 int ff_thread_can_start_frame(AVCodecContext *avctx);
162 #endif /* AVCODEC_INTERNAL_H */