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.
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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"
37 * The codec does not modify any global variables in the init function,
38 * allowing to call the init function without locking any global mutexes.
40 #define FF_CODEC_CAP_INIT_THREADSAFE (1 << 0)
42 * The codec allows calling the close function for deallocation even if
43 * the init function returned a failure. Without this capability flag, a
44 * codec does such cleanup internally when returning failures from the
45 * init function and does not expect the close function to be called at
48 #define FF_CODEC_CAP_INIT_CLEANUP (1 << 1)
50 * Decoders marked with FF_CODEC_CAP_SETS_PKT_DTS want to set
51 * AVFrame.pkt_dts manually. If the flag is set, utils.c won't overwrite
52 * this field. If it's unset, utils.c tries to guess the pkt_dts field
53 * from the input AVPacket.
55 #define FF_CODEC_CAP_SETS_PKT_DTS (1 << 2)
57 * The decoder sets the cropping fields in the output frames manually.
58 * If this cap is set, the generic code will initialize output frame
59 * dimensions to coded rather than display values.
61 #define FF_CODEC_CAP_EXPORTS_CROPPING (1 << 3)
64 # define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__)
66 # define ff_dlog(ctx, ...) do { } while (0)
70 # define ff_tlog(ctx, ...) av_log(ctx, AV_LOG_TRACE, __VA_ARGS__)
72 # define ff_tlog(ctx, ...) do { } while (0)
76 #define FF_DEFAULT_QUANT_BIAS 999999
78 #define FF_SANE_NB_CHANNELS 63U
80 #define FF_SIGNBIT(x) (x >> CHAR_BIT * sizeof(x) - 1)
82 typedef struct FramePool {
84 * Pools for each data plane. For audio all the planes have the same size,
85 * so only pools[0] is used.
87 AVBufferPool *pools[4];
94 int stride_align[AV_NUM_DATA_POINTERS];
101 typedef struct DecodeSimpleContext {
104 } DecodeSimpleContext;
106 typedef struct DecodeFilterContext {
109 } DecodeFilterContext;
111 typedef struct AVCodecInternal {
113 * Whether the parent AVCodecContext is a copy of the context which had
114 * init() called on it.
115 * This is used by multithreading - shared tables and picture pointers
116 * should be freed from the original context only.
121 * Whether to allocate progress for frame threading.
123 * The codec must set it to 1 if it uses ff_thread_await/report_progress(),
124 * then progress will be allocated in ff_thread_get_buffer(). The frames
125 * then MUST be freed with ff_thread_release_buffer().
127 * If the codec does not need to call the progress functions (there are no
128 * dependencies between the frames), it should leave this at 0. Then it can
129 * decode straight to the user-provided frames (which the user will then
130 * free with av_frame_unref()), there is no need to call
131 * ff_thread_release_buffer().
133 int allocate_progress;
136 * An audio frame with less than required samples has been submitted and
137 * padded with silence. Reject all subsequent frames.
139 int last_audio_frame;
147 DecodeSimpleContext ds;
148 DecodeFilterContext filter;
151 * Properties (timestamps+side data) extracted from the last packet passed
154 AVPacket *last_pkt_props;
157 * hwaccel-specific private data
159 void *hwaccel_priv_data;
162 * checks API usage: after codec draining, flush is required to resume operation
167 * buffers for using new encode/decode API through legacy API
169 AVPacket *buffer_pkt;
170 int buffer_pkt_valid; // encoding: packet without data can be valid
171 AVFrame *buffer_frame;
173 /* set to 1 when the caller is using the old decoding API */
175 int compat_decode_warned;
176 /* this variable is set by the decoder internals to signal to the old
177 * API compat wrappers the amount of data consumed from the last packet */
178 size_t compat_decode_consumed;
179 /* when a partial packet has been consumed, this stores the remaining size
180 * of the packet (that should be submitted in the next decode call */
181 size_t compat_decode_partial_size;
182 AVFrame *compat_decode_frame;
185 struct AVCodecDefault {
187 const uint8_t *value;
191 * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
192 * If there is no such matching pair then size is returned.
194 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
196 unsigned int avpriv_toupper4(unsigned int x);
198 int avpriv_lock_avformat(void);
199 int avpriv_unlock_avformat(void);
202 * Maximum size in bytes of extradata.
203 * This value was chosen such that every bit of the buffer is
204 * addressable by a 32-bit signed integer as used by get_bits.
206 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - AV_INPUT_BUFFER_PADDING_SIZE)
209 * Check AVPacket size and/or allocate data.
211 * Encoders supporting AVCodec.encode2() can use this as a convenience to
212 * ensure the output packet data is large enough, whether provided by the user
213 * or allocated in this function.
215 * @param avpkt the AVPacket
216 * If avpkt->data is already set, avpkt->size is checked
217 * to ensure it is large enough.
218 * If avpkt->data is NULL, a new buffer is allocated.
219 * avpkt->size is set to the specified size.
220 * All other AVPacket fields will be reset with av_init_packet().
221 * @param size the minimum required packet size
222 * @return 0 on success, negative error code on failure
224 int ff_alloc_packet(AVPacket *avpkt, int size);
227 * Rescale from sample rate to AVCodecContext.time_base.
229 static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
232 return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
237 * Get a buffer for a frame. This is a wrapper around
238 * AVCodecContext.get_buffer() and should be used instead calling get_buffer()
241 int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
244 * Identical in function to av_frame_make_writable(), except it uses
245 * ff_get_buffer() to allocate the buffer when needed.
247 int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame);
249 const uint8_t *avpriv_find_start_code(const uint8_t *restrict p,
251 uint32_t *restrict state);
254 * Check that the provided frame dimensions are valid and set them on the codec
257 int ff_set_dimensions(AVCodecContext *s, int width, int height);
260 * Check that the provided sample aspect ratio is valid and set it on the codec
263 int ff_set_sar(AVCodecContext *avctx, AVRational sar);
266 * Add or update AV_FRAME_DATA_MATRIXENCODING side data.
268 int ff_side_data_update_matrix_encoding(AVFrame *frame,
269 enum AVMatrixEncoding matrix_encoding);
272 * Select the (possibly hardware accelerated) pixel format.
273 * This is a wrapper around AVCodecContext.get_format() and should be used
274 * instead of calling get_format() directly.
276 int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
279 * Set various frame properties from the codec context / packet data.
281 int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame);
284 * Add a CPB properties side data to an encoding context.
286 AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx);
288 #if defined(_WIN32) && CONFIG_SHARED
289 #ifdef BUILDING_avcodec
290 # define av_export_avcodec __declspec(dllexport)
292 # define av_export_avcodec __declspec(dllimport)
295 # define av_export_avcodec
298 #endif /* AVCODEC_INTERNAL_H */