229 lines
6.9 KiB
C
229 lines
6.9 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* common internal api header.
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*/
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#ifndef AVCODEC_INTERNAL_H
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#define AVCODEC_INTERNAL_H
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#include <stdint.h>
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#include "libavutil/buffer.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/pixfmt.h"
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#include "avcodec.h"
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#include "config.h"
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#define FF_SANE_NB_CHANNELS 63U
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typedef struct FramePool {
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/**
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* Pools for each data plane. For audio all the planes have the same size,
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* so only pools[0] is used.
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*/
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AVBufferPool *pools[4];
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/*
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* Pool parameters
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*/
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int format;
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int width, height;
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int stride_align[AV_NUM_DATA_POINTERS];
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int linesize[4];
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int planes;
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int channels;
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int samples;
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} FramePool;
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typedef struct AVCodecInternal {
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/**
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* Whether the parent AVCodecContext is a copy of the context which had
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* init() called on it.
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* This is used by multithreading - shared tables and picture pointers
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* should be freed from the original context only.
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*/
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int is_copy;
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/**
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* Whether to allocate progress for frame threading.
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*
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* The codec must set it to 1 if it uses ff_thread_await/report_progress(),
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* then progress will be allocated in ff_thread_get_buffer(). The frames
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* then MUST be freed with ff_thread_release_buffer().
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*
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* If the codec does not need to call the progress functions (there are no
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* dependencies between the frames), it should leave this at 0. Then it can
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* decode straight to the user-provided frames (which the user will then
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* free with av_frame_unref()), there is no need to call
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* ff_thread_release_buffer().
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*/
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int allocate_progress;
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#if FF_API_OLD_ENCODE_AUDIO
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/**
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* Internal sample count used by avcodec_encode_audio() to fabricate pts.
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* Can be removed along with avcodec_encode_audio().
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*/
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int64_t sample_count;
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#endif
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/**
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* An audio frame with less than required samples has been submitted and
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* padded with silence. Reject all subsequent frames.
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*/
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int last_audio_frame;
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AVFrame to_free;
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FramePool *pool;
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/**
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* temporary buffer used for encoders to store their bitstream
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*/
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uint8_t *byte_buffer;
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unsigned int byte_buffer_size;
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void *frame_thread_encoder;
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/**
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* Number of audio samples to skip at the start of the next decoded frame
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*/
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int skip_samples;
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} AVCodecInternal;
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struct AVCodecDefault {
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const uint8_t *key;
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const uint8_t *value;
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};
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/**
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* Return the hardware accelerated codec for codec codec_id and
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* pixel format pix_fmt.
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*
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* @param codec_id the codec to match
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* @param pix_fmt the pixel format to match
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* @return the hardware accelerated codec, or NULL if none was found.
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*/
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AVHWAccel *ff_find_hwaccel(enum AVCodecID codec_id, enum AVPixelFormat pix_fmt);
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/**
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* Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
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* If there is no such matching pair then size is returned.
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*/
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int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
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unsigned int avpriv_toupper4(unsigned int x);
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/**
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* does needed setup of pkt_pts/pos and such for (re)get_buffer();
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*/
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int ff_init_buffer_info(AVCodecContext *s, AVFrame *frame);
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void avpriv_color_frame(AVFrame *frame, const int color[4]);
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extern volatile int ff_avcodec_locked;
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int ff_lock_avcodec(AVCodecContext *log_ctx);
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int ff_unlock_avcodec(void);
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int avpriv_lock_avformat(void);
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int avpriv_unlock_avformat(void);
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/**
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* Maximum size in bytes of extradata.
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* This value was chosen such that every bit of the buffer is
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* addressable by a 32-bit signed integer as used by get_bits.
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*/
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#define FF_MAX_EXTRADATA_SIZE ((1 << 28) - FF_INPUT_BUFFER_PADDING_SIZE)
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/**
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* Check AVPacket size and/or allocate data.
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*
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* Encoders supporting AVCodec.encode2() can use this as a convenience to
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* ensure the output packet data is large enough, whether provided by the user
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* or allocated in this function.
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*
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* @param avctx the AVCodecContext of the encoder
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* @param avpkt the AVPacket
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* If avpkt->data is already set, avpkt->size is checked
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* to ensure it is large enough.
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* If avpkt->data is NULL, a new buffer is allocated.
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* avpkt->size is set to the specified size.
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* All other AVPacket fields will be reset with av_init_packet().
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* @param size the minimum required packet size
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* @return 0 on success, negative error code on failure
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*/
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int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size);
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int ff_alloc_packet(AVPacket *avpkt, int size);
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/**
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* Rescale from sample rate to AVCodecContext.time_base.
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*/
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static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
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int64_t samples)
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{
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if(samples == AV_NOPTS_VALUE)
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return AV_NOPTS_VALUE;
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return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
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avctx->time_base);
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}
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/**
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* Get a buffer for a frame. This is a wrapper around
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* AVCodecContext.get_buffer() and should be used instead calling get_buffer()
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* directly.
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*/
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int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
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/**
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* Identical in function to av_frame_make_writable(), except it uses
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* ff_get_buffer() to allocate the buffer when needed.
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*/
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int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame);
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int ff_thread_can_start_frame(AVCodecContext *avctx);
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int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
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/**
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* Call avcodec_open2 recursively by decrementing counter, unlocking mutex,
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* calling the function and then restoring again. Assumes the mutex is
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* already locked
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*/
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int ff_codec_open2_recursive(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
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/**
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* Call avcodec_close recursively, counterpart to avcodec_open2_recursive.
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*/
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int ff_codec_close_recursive(AVCodecContext *avctx);
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/**
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* Finalize buf into extradata and set its size appropriately.
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*/
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int avpriv_bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf);
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const uint8_t *avpriv_find_start_code(const uint8_t *p,
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const uint8_t *end,
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uint32_t *state);
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#endif /* AVCODEC_INTERNAL_H */
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