2 * This file is part of Libav.
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.
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.
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
21 * common internal api header.
24 #ifndef AVCODEC_INTERNAL_H
25 #define AVCODEC_INTERNAL_H
29 #include "libavutil/buffer.h"
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/mathematics.h"
32 #include "libavutil/pixfmt.h"
36 #define FF_SANE_NB_CHANNELS 63U
38 #define FF_SIGNBIT(x) (x >> CHAR_BIT * sizeof(x) - 1)
40 typedef struct FramePool {
42 * Pools for each data plane. For audio all the planes have the same size,
43 * so only pools[0] is used.
45 AVBufferPool *pools[4];
52 int stride_align[AV_NUM_DATA_POINTERS];
59 typedef struct AVCodecInternal {
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.
69 * Whether to allocate progress for frame threading.
71 * The codec must set it to 1 if it uses ff_thread_await/report_progress(),
72 * then progress will be allocated in ff_thread_get_buffer(). The frames
73 * then MUST be freed with ff_thread_release_buffer().
75 * If the codec does not need to call the progress functions (there are no
76 * dependencies between the frames), it should leave this at 0. Then it can
77 * decode straight to the user-provided frames (which the user will then
78 * free with av_frame_unref()), there is no need to call
79 * ff_thread_release_buffer().
81 int allocate_progress;
84 * An audio frame with less than required samples has been submitted and
85 * padded with silence. Reject all subsequent frames.
96 * Current packet as passed into the decoder, to avoid having to pass the
97 * packet into every function.
102 * hwaccel-specific private data
104 void *hwaccel_priv_data;
107 struct AVCodecDefault {
109 const uint8_t *value;
113 * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
114 * If there is no such matching pair then size is returned.
116 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
118 unsigned int avpriv_toupper4(unsigned int x);
120 int avpriv_lock_avformat(void);
121 int avpriv_unlock_avformat(void);
124 * Maximum size in bytes of extradata.
125 * This value was chosen such that every bit of the buffer is
126 * addressable by a 32-bit signed integer as used by get_bits.
128 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - FF_INPUT_BUFFER_PADDING_SIZE)
131 * Check AVPacket size and/or allocate data.
133 * Encoders supporting AVCodec.encode2() can use this as a convenience to
134 * ensure the output packet data is large enough, whether provided by the user
135 * or allocated in this function.
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_packet(AVPacket *avpkt, int size);
149 * Rescale from sample rate to AVCodecContext.time_base.
151 static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
154 return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
159 * Get a buffer for a frame. This is a wrapper around
160 * AVCodecContext.get_buffer() and should be used instead calling get_buffer()
163 int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
166 * Identical in function to av_frame_make_writable(), except it uses
167 * ff_get_buffer() to allocate the buffer when needed.
169 int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame);
171 const uint8_t *avpriv_find_start_code(const uint8_t *restrict p,
173 uint32_t *restrict state);
176 * Check that the provided frame dimensions are valid and set them on the codec
179 int ff_set_dimensions(AVCodecContext *s, int width, int height);
182 * Check that the provided sample aspect ratio is valid and set it on the codec
185 int ff_set_sar(AVCodecContext *avctx, AVRational sar);
188 * Add or update AV_FRAME_DATA_MATRIXENCODING side data.
190 int ff_side_data_update_matrix_encoding(AVFrame *frame,
191 enum AVMatrixEncoding matrix_encoding);
194 * Select the (possibly hardware accelerated) pixel format.
195 * This is a wrapper around AVCodecContext.get_format() and should be used
196 * instead of calling get_format() directly.
198 int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
201 * Set various frame properties from the codec context / packet data.
203 int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame);
205 #endif /* AVCODEC_INTERNAL_H */