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/*

 * 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/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;

#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;

    /**

     * 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;

} 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 codec_id the codec to match

 * @param pix_fmt the pixel format to match

 * @return the hardware accelerated codec, or NULL if none was found.

 */

AVHWAccel *ff_find_hwaccel(enum AVCodecID codec_id, enum AVPixelFormat pix_fmt);

/**

 * 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);

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        0 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);

/**

 * Call avcodec_close recursively, counterpart to avcodec_open2_recursive.

 */

int ff_codec_close_recursive(AVCodecContext *avctx);

/**

 * 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);

#endif /* AVCODEC_INTERNAL_H */