/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * common internal api header. */ #ifndef AVCODEC_INTERNAL_H #define AVCODEC_INTERNAL_H #include #include "libavutil/buffer.h" #include "libavutil/channel_layout.h" #include "libavutil/mathematics.h" #include "libavutil/pixfmt.h" #include "avcodec.h" #include "config.h" /** * The codec does not modify any global variables in the init function, * allowing to call the init function without locking any global mutexes. */ #define FF_CODEC_CAP_INIT_THREADSAFE (1 << 0) /** * The codec allows calling the close function for deallocation even if * the init function returned a failure. Without this capability flag, a * codec does such cleanup internally when returning failures from the * init function and does not expect the close function to be called at * all. */ #define FF_CODEC_CAP_INIT_CLEANUP (1 << 1) #define FF_SANE_NB_CHANNELS 63U #define FF_SIGNBIT(x) ((x) >> CHAR_BIT * sizeof(x) - 1) #if HAVE_AVX # define STRIDE_ALIGN 32 #elif HAVE_SIMD_ALIGN_16 # define STRIDE_ALIGN 16 #else # define STRIDE_ALIGN 8 #endif typedef struct FramePool { /** * Pools for each data plane. For audio all the planes have the same size, * so only pools[0] is used. */ AVBufferPool *pools[4]; /* * Pool parameters */ int format; int width, height; int stride_align[AV_NUM_DATA_POINTERS]; int linesize[4]; int planes; int channels; int samples; } FramePool; typedef struct AVCodecInternal { /** * Whether the parent AVCodecContext is a copy of the context which had * init() called on it. * This is used by multithreading - shared tables and picture pointers * should be freed from the original context only. */ int is_copy; /** * Whether to allocate progress for frame threading. * * The codec must set it to 1 if it uses ff_thread_await/report_progress(), * then progress will be allocated in ff_thread_get_buffer(). The frames * then MUST be freed with ff_thread_release_buffer(). * * If the codec does not need to call the progress functions (there are no * dependencies between the frames), it should leave this at 0. Then it can * decode straight to the user-provided frames (which the user will then * free with av_frame_unref()), there is no need to call * ff_thread_release_buffer(). */ int allocate_progress; #if FF_API_OLD_ENCODE_AUDIO /** * Internal sample count used by avcodec_encode_audio() to fabricate pts. * Can be removed along with avcodec_encode_audio(). */ int64_t sample_count; #endif /** * An audio frame with less than required samples has been submitted and * padded with silence. Reject all subsequent frames. */ int last_audio_frame; AVFrame *to_free; FramePool *pool; void *thread_ctx; /** * Current packet as passed into the decoder, to avoid having to pass the * packet into every function. */ AVPacket *pkt; /** * temporary buffer used for encoders to store their bitstream */ uint8_t *byte_buffer; unsigned int byte_buffer_size; void *frame_thread_encoder; /** * Number of audio samples to skip at the start of the next decoded frame */ int skip_samples; /** * hwaccel-specific private data */ void *hwaccel_priv_data; } AVCodecInternal; struct AVCodecDefault { const uint8_t *key; const uint8_t *value; }; extern const uint8_t ff_log2_run[41]; /** * Return the index into tab at which {a,b} match elements {[0],[1]} of tab. * If there is no such matching pair then size is returned. */ int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b); unsigned int avpriv_toupper4(unsigned int x); /** * does needed setup of pkt_pts/pos and such for (re)get_buffer(); */ int ff_init_buffer_info(AVCodecContext *s, AVFrame *frame); void avpriv_color_frame(AVFrame *frame, const int color[4]); extern volatile int ff_avcodec_locked; int ff_lock_avcodec(AVCodecContext *log_ctx, const AVCodec *codec); int ff_unlock_avcodec(void); int avpriv_lock_avformat(void); int avpriv_unlock_avformat(void); /** * Maximum size in bytes of extradata. * This value was chosen such that every bit of the buffer is * addressable by a 32-bit signed integer as used by get_bits. */ #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - FF_INPUT_BUFFER_PADDING_SIZE) /** * Check AVPacket size and/or allocate data. * * Encoders supporting AVCodec.encode2() can use this as a convenience to * ensure the output packet data is large enough, whether provided by the user * or allocated in this function. * * @param avctx the AVCodecContext of the encoder * @param avpkt the AVPacket * If avpkt->data is already set, avpkt->size is checked * to ensure it is large enough. * If avpkt->data is NULL, a new buffer is allocated. * avpkt->size is set to the specified size. * All other AVPacket fields will be reset with av_init_packet(). * @param size the minimum required packet size * @return non negative on success, negative error code on failure */ int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size); int ff_alloc_packet(AVPacket *avpkt, int size); /** * Rescale from sample rate to AVCodecContext.time_base. */ static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx, int64_t samples) { if(samples == AV_NOPTS_VALUE) return AV_NOPTS_VALUE; return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate }, avctx->time_base); } /** * Get a buffer for a frame. This is a wrapper around * AVCodecContext.get_buffer() and should be used instead calling get_buffer() * directly. */ int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags); /** * Identical in function to av_frame_make_writable(), except it uses * ff_get_buffer() to allocate the buffer when needed. */ int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame); int ff_thread_can_start_frame(AVCodecContext *avctx); int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx); /** * Call avcodec_open2 recursively by decrementing counter, unlocking mutex, * calling the function and then restoring again. Assumes the mutex is * already locked */ int ff_codec_open2_recursive(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options); /** * Finalize buf into extradata and set its size appropriately. */ int avpriv_bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf); const uint8_t *avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state); /** * Check that the provided frame dimensions are valid and set them on the codec * context. */ int ff_set_dimensions(AVCodecContext *s, int width, int height); /** * Check that the provided sample aspect ratio is valid and set it on the codec * context. */ int ff_set_sar(AVCodecContext *avctx, AVRational sar); /** * Add or update AV_FRAME_DATA_MATRIXENCODING side data. */ int ff_side_data_update_matrix_encoding(AVFrame *frame, enum AVMatrixEncoding matrix_encoding); /** * Select the (possibly hardware accelerated) pixel format. * This is a wrapper around AVCodecContext.get_format() and should be used * instead of calling get_format() directly. */ int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt); /** * Set various frame properties from the codec context / packet data. */ int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame); #endif /* AVCODEC_INTERNAL_H */