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/*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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 <stdint.h>
#include "libavutil/buffer.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixfmt.h"
#include "avcodec.h"
#include "config.h"
#define FF_SANE_NB_CHANNELS 63U
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;
/**
* 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;
} AVCodecInternal;
struct AVCodecDefault {
const uint8_t *key;
const uint8_t *value;
};
/**
* Return the hardware accelerated codec for codec codec_id and
* pixel format pix_fmt.
*
* @param avctx The codec context containing the codec_id and pixel format.
* @return the hardware accelerated codec, or NULL if none was found.
*/
AVHWAccel *ff_find_hwaccel(AVCodecContext *avctx);
/**
* 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);
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 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 0 on success, negative error code on failure
*/
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)
{
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);
const uint8_t *avpriv_find_start_code(const uint8_t *restrict p,
const uint8_t *end,
uint32_t *restrict 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);
#endif /* AVCODEC_INTERNAL_H */
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