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/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)
51 #define FF_SANE_NB_CHANNELS 63U
53 #define FF_SIGNBIT(x) ((x) >> CHAR_BIT * sizeof(x) - 1)
56 # define STRIDE_ALIGN 32
57 #elif HAVE_SIMD_ALIGN_16
58 # define STRIDE_ALIGN 16
60 # define STRIDE_ALIGN 8
63 typedef struct FramePool {
65 * Pools for each data plane. For audio all the planes have the same size,
66 * so only pools[0] is used.
68 AVBufferPool *pools[4];
75 int stride_align[AV_NUM_DATA_POINTERS];
82 typedef struct AVCodecInternal {
84 * Whether the parent AVCodecContext is a copy of the context which had
85 * init() called on it.
86 * This is used by multithreading - shared tables and picture pointers
87 * should be freed from the original context only.
92 * Whether to allocate progress for frame threading.
94 * The codec must set it to 1 if it uses ff_thread_await/report_progress(),
95 * then progress will be allocated in ff_thread_get_buffer(). The frames
96 * then MUST be freed with ff_thread_release_buffer().
98 * If the codec does not need to call the progress functions (there are no
99 * dependencies between the frames), it should leave this at 0. Then it can
100 * decode straight to the user-provided frames (which the user will then
101 * free with av_frame_unref()), there is no need to call
102 * ff_thread_release_buffer().
104 int allocate_progress;
106 #if FF_API_OLD_ENCODE_AUDIO
108 * Internal sample count used by avcodec_encode_audio() to fabricate pts.
109 * Can be removed along with avcodec_encode_audio().
111 int64_t sample_count;
115 * An audio frame with less than required samples has been submitted and
116 * padded with silence. Reject all subsequent frames.
118 int last_audio_frame;
127 * Current packet as passed into the decoder, to avoid having to pass the
128 * packet into every function.
133 * temporary buffer used for encoders to store their bitstream
135 uint8_t *byte_buffer;
136 unsigned int byte_buffer_size;
138 void *frame_thread_encoder;
141 * Number of audio samples to skip at the start of the next decoded frame
146 * hwaccel-specific private data
148 void *hwaccel_priv_data;
151 struct AVCodecDefault {
153 const uint8_t *value;
156 extern const uint8_t ff_log2_run[41];
159 * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
160 * If there is no such matching pair then size is returned.
162 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
164 unsigned int avpriv_toupper4(unsigned int x);
167 * does needed setup of pkt_pts/pos and such for (re)get_buffer();
169 int ff_init_buffer_info(AVCodecContext *s, AVFrame *frame);
172 void avpriv_color_frame(AVFrame *frame, const int color[4]);
174 extern volatile int ff_avcodec_locked;
175 int ff_lock_avcodec(AVCodecContext *log_ctx, const AVCodec *codec);
176 int ff_unlock_avcodec(void);
178 int avpriv_lock_avformat(void);
179 int avpriv_unlock_avformat(void);
182 * Maximum size in bytes of extradata.
183 * This value was chosen such that every bit of the buffer is
184 * addressable by a 32-bit signed integer as used by get_bits.
186 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - FF_INPUT_BUFFER_PADDING_SIZE)
189 * Check AVPacket size and/or allocate data.
191 * Encoders supporting AVCodec.encode2() can use this as a convenience to
192 * ensure the output packet data is large enough, whether provided by the user
193 * or allocated in this function.
195 * @param avctx the AVCodecContext of the encoder
196 * @param avpkt the AVPacket
197 * If avpkt->data is already set, avpkt->size is checked
198 * to ensure it is large enough.
199 * If avpkt->data is NULL, a new buffer is allocated.
200 * avpkt->size is set to the specified size.
201 * All other AVPacket fields will be reset with av_init_packet().
202 * @param size the minimum required packet size
203 * @return non negative on success, negative error code on failure
205 int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size);
207 int ff_alloc_packet(AVPacket *avpkt, int size);
210 * Rescale from sample rate to AVCodecContext.time_base.
212 static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
215 if(samples == AV_NOPTS_VALUE)
216 return AV_NOPTS_VALUE;
217 return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
222 * Get a buffer for a frame. This is a wrapper around
223 * AVCodecContext.get_buffer() and should be used instead calling get_buffer()
226 int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
229 * Identical in function to av_frame_make_writable(), except it uses
230 * ff_get_buffer() to allocate the buffer when needed.
232 int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame);
234 int ff_thread_can_start_frame(AVCodecContext *avctx);
236 int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
239 * Call avcodec_open2 recursively by decrementing counter, unlocking mutex,
240 * calling the function and then restoring again. Assumes the mutex is
243 int ff_codec_open2_recursive(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
246 * Finalize buf into extradata and set its size appropriately.
248 int avpriv_bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf);
250 const uint8_t *avpriv_find_start_code(const uint8_t *p,
255 * Check that the provided frame dimensions are valid and set them on the codec
258 int ff_set_dimensions(AVCodecContext *s, int width, int height);
261 * Check that the provided sample aspect ratio is valid and set it on the codec
264 int ff_set_sar(AVCodecContext *avctx, AVRational sar);
267 * Add or update AV_FRAME_DATA_MATRIXENCODING side data.
269 int ff_side_data_update_matrix_encoding(AVFrame *frame,
270 enum AVMatrixEncoding matrix_encoding);
273 * Select the (possibly hardware accelerated) pixel format.
274 * This is a wrapper around AVCodecContext.get_format() and should be used
275 * instead of calling get_format() directly.
277 int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
280 * Set various frame properties from the codec context / packet data.
282 int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame);
284 #endif /* AVCODEC_INTERNAL_H */