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;
44 typedef struct AVCodecInternal {
46 * internal buffer count
47 * used by default get/release/reget_buffer().
53 * used by default get/release/reget_buffer().
55 InternalBuffer *buffer;
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.
65 #if FF_API_OLD_DECODE_AUDIO
67 * Internal sample count used by avcodec_encode_audio() to fabricate pts.
68 * Can be removed along with avcodec_encode_audio().
74 * An audio frame with less than required samples has been submitted and
75 * padded with silence. Reject all subsequent frames.
80 * The data for the last allocated audio frame.
81 * Stored here so we can free it.
86 * temporary buffer used for encoders to store their bitstream
89 unsigned int byte_buffer_size;
91 void *frame_thread_encoder;
94 * Number of audio samples to skip at the start of the next decoded frame
99 struct AVCodecDefault {
101 const uint8_t *value;
105 * Return the hardware accelerated codec for codec codec_id and
106 * pixel format pix_fmt.
108 * @param codec_id the codec to match
109 * @param pix_fmt the pixel format to match
110 * @return the hardware accelerated codec, or NULL if none was found.
112 AVHWAccel *ff_find_hwaccel(enum AVCodecID codec_id, enum AVPixelFormat pix_fmt);
115 * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
116 * If there is no such matching pair then size is returned.
118 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
120 unsigned int avpriv_toupper4(unsigned int x);
123 * does needed setup of pkt_pts/pos and such for (re)get_buffer();
125 void ff_init_buffer_info(AVCodecContext *s, AVFrame *frame);
128 void avpriv_color_frame(AVFrame *frame, const int color[4]);
131 * Remove and free all side data from packet.
133 void ff_packet_free_side_data(AVPacket *pkt);
135 extern volatile int ff_avcodec_locked;
136 int ff_lock_avcodec(AVCodecContext *log_ctx);
137 int ff_unlock_avcodec(void);
139 int avpriv_lock_avformat(void);
140 int avpriv_unlock_avformat(void);
143 * Maximum size in bytes of extradata.
144 * This value was chosen such that every bit of the buffer is
145 * addressable by a 32-bit signed integer as used by get_bits.
147 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - FF_INPUT_BUFFER_PADDING_SIZE)
150 * Check AVPacket size and/or allocate data.
152 * Encoders supporting AVCodec.encode2() can use this as a convenience to
153 * ensure the output packet data is large enough, whether provided by the user
154 * or allocated in this function.
156 * @param avctx the AVCodecContext of the encoder
157 * @param avpkt the AVPacket
158 * If avpkt->data is already set, avpkt->size is checked
159 * to ensure it is large enough.
160 * If avpkt->data is NULL, a new buffer is allocated.
161 * avpkt->size is set to the specified size.
162 * All other AVPacket fields will be reset with av_init_packet().
163 * @param size the minimum required packet size
164 * @return 0 on success, negative error code on failure
166 int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int size);
168 int ff_alloc_packet(AVPacket *avpkt, int size);
171 * Rescale from sample rate to AVCodecContext.time_base.
173 static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
176 if(samples == AV_NOPTS_VALUE)
177 return AV_NOPTS_VALUE;
178 return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
183 * Get a buffer for a frame. This is a wrapper around
184 * AVCodecContext.get_buffer() and should be used instead calling get_buffer()
187 int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame);
189 int ff_thread_can_start_frame(AVCodecContext *avctx);
191 int ff_get_logical_cpus(AVCodecContext *avctx);
193 int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
196 * Call avcodec_open2 recursively by decrementing counter, unlocking mutex,
197 * calling the function and then restoring again. Assumes the mutex is
200 int ff_codec_open2_recursive(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
203 * Call avcodec_close recursively, counterpart to avcodec_open2_recursive.
205 int ff_codec_close_recursive(AVCodecContext *avctx);
208 * Finalize buf into extradata and set its size appropriately.
210 int avpriv_bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf);
212 #endif /* AVCODEC_INTERNAL_H */