/*
  * 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 <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;
 

 #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]);
 

 /**
  * Remove and free all side data from packet.
  */
 void ff_packet_free_side_data(AVPacket *pkt);
 

 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, int 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 */