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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
* 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.
#include <stdint.h>
#include "libavutil/mathematics.h"
#include "libavutil/pixfmt.h"
#include "avcodec.h"
typedef struct InternalBuffer {
uint8_t *base[AV_NUM_DATA_POINTERS];
uint8_t *data[AV_NUM_DATA_POINTERS];
int linesize[AV_NUM_DATA_POINTERS];
int width;
int height;
enum PixelFormat pix_fmt;
uint8_t **extended_data;
int audio_data_size;
int nb_channels;
} InternalBuffer;
typedef struct AVCodecInternal {
* internal buffer count
* used by default get/release/reget_buffer().
int buffer_count;
* internal buffers
* used by default get/release/reget_buffer().
InternalBuffer *buffer;
* 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;
* Internal sample count used by avcodec_encode_audio() to fabricate pts.
* Can be removed along with avcodec_encode_audio().
int sample_count;
* An audio frame with less than required samples has been submitted and
* padded with silence. Reject all subsequent frames.
int last_audio_frame;
* 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;
* Determine whether pix_fmt is a hardware accelerated format.
int ff_is_hwaccel_pix_fmt(enum PixelFormat pix_fmt);
* 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 PixelFormat 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();
void ff_init_buffer_info(AVCodecContext *s, AVFrame *frame);
* Remove and free all side data from packet.
void ff_packet_free_side_data(AVPacket *pkt);
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.
* 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_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
int ff_thread_can_start_frame(AVCodecContext *avctx);
int ff_get_logical_cpus(AVCodecContext *avctx);
int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
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