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 #define FF_SANE_NB_CHANNELS 128U
35 typedef struct InternalBuffer {
36 uint8_t *base[AV_NUM_DATA_POINTERS];
37 uint8_t *data[AV_NUM_DATA_POINTERS];
38 int linesize[AV_NUM_DATA_POINTERS];
41 enum AVPixelFormat pix_fmt;
42 uint8_t **extended_data;
47 typedef struct AVCodecInternal {
49 * internal buffer count
50 * used by default get/release/reget_buffer().
56 * used by default get/release/reget_buffer().
58 InternalBuffer *buffer;
61 * Whether the parent AVCodecContext is a copy of the context which had
62 * init() called on it.
63 * This is used by multithreading - shared tables and picture pointers
64 * should be freed from the original context only.
68 #if FF_API_OLD_DECODE_AUDIO
70 * Internal sample count used by avcodec_encode_audio() to fabricate pts.
71 * Can be removed along with avcodec_encode_audio().
77 * An audio frame with less than required samples has been submitted and
78 * padded with silence. Reject all subsequent frames.
83 * temporary buffer used for encoders to store their bitstream
86 unsigned int byte_buffer_size;
88 void *frame_thread_encoder;
91 * Number of audio samples to skip at the start of the next decoded frame
96 struct AVCodecDefault {
102 * Determine whether pix_fmt is a hardware accelerated format.
104 int ff_is_hwaccel_pix_fmt(enum AVPixelFormat pix_fmt);
107 * Return the hardware accelerated codec for codec codec_id and
108 * pixel format pix_fmt.
110 * @param codec_id the codec to match
111 * @param pix_fmt the pixel format to match
112 * @return the hardware accelerated codec, or NULL if none was found.
114 AVHWAccel *ff_find_hwaccel(enum AVCodecID codec_id, enum AVPixelFormat pix_fmt);
117 * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
118 * If there is no such matching pair then size is returned.
120 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
122 unsigned int avpriv_toupper4(unsigned int x);
125 * does needed setup of pkt_pts/pos and such for (re)get_buffer();
127 void ff_init_buffer_info(AVCodecContext *s, AVFrame *frame);
130 * Remove and free all side data from packet.
132 void ff_packet_free_side_data(AVPacket *pkt);
134 int avpriv_lock_avformat(void);
135 int avpriv_unlock_avformat(void);
138 * Maximum size in bytes of extradata.
139 * This value was chosen such that every bit of the buffer is
140 * addressable by a 32-bit signed integer as used by get_bits.
142 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - FF_INPUT_BUFFER_PADDING_SIZE)
145 * Check AVPacket size and/or allocate data.
147 * Encoders supporting AVCodec.encode2() can use this as a convenience to
148 * ensure the output packet data is large enough, whether provided by the user
149 * or allocated in this function.
151 * @param avctx the AVCodecContext of the encoder
152 * @param avpkt the AVPacket
153 * If avpkt->data is already set, avpkt->size is checked
154 * to ensure it is large enough.
155 * If avpkt->data is NULL, a new buffer is allocated.
156 * avpkt->size is set to the specified size.
157 * All other AVPacket fields will be reset with av_init_packet().
158 * @param size the minimum required packet size
159 * @return 0 on success, negative error code on failure
161 int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int size);
163 int ff_alloc_packet(AVPacket *avpkt, int size);
166 * Rescale from sample rate to AVCodecContext.time_base.
168 static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
171 if(samples == AV_NOPTS_VALUE)
172 return AV_NOPTS_VALUE;
173 return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
177 int ff_thread_can_start_frame(AVCodecContext *avctx);
179 int ff_get_logical_cpus(AVCodecContext *avctx);
181 int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
184 * Call avcodec_open2 recursively by decrementing counter, unlocking mutex,
185 * calling the function and then restoring again. Assumes the mutex is
188 int ff_codec_open2_recursive(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
191 * Call avcodec_close recursively, counterpart to avcodec_open2_recursive.
193 int ff_codec_close_recursive(AVCodecContext *avctx);
195 #endif /* AVCODEC_INTERNAL_H */