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/*
* generic encoding-related code
*
* 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
*/
#ifndef AVCODEC_ENCODE_H
#define AVCODEC_ENCODE_H
#include "libavutil/frame.h"
#include "avcodec.h"
#include "packet.h"
/**
* Used by some encoders as upper bound for the length of headers.
* TODO: Use proper codec-specific upper bounds.
*/
#define FF_INPUT_BUFFER_MIN_SIZE 16384
/**
* Called by encoders to get the next frame for encoding.
*
* @param frame An empty frame to be filled with data.
* @return 0 if a new reference has been successfully written to frame
* AVERROR(EAGAIN) if no data is currently available
* AVERROR_EOF if end of stream has been reached, so no more data
* will be available
*/
int ff_encode_get_frame(AVCodecContext *avctx, AVFrame *frame);
/**
* Get a buffer for a packet. This is a wrapper around
* AVCodecContext.get_encode_buffer() and should be used instead calling get_encode_buffer()
* directly.
*/
int ff_get_encode_buffer(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int flags);
/**
* Allocate buffers for a frame. Encoder equivalent to ff_get_buffer().
*/
int ff_encode_alloc_frame(AVCodecContext *avctx, AVFrame *frame);
/**
* Check AVPacket size and allocate data.
*
* Encoders of type FF_CODEC_CB_TYPE_ENCODE can use this as a convenience to
* obtain a big enough buffer for the encoded bitstream.
*
* @param avctx the AVCodecContext of the encoder
* @param avpkt The AVPacket: on success, avpkt->data will point to a buffer
* of size at least `size`; the packet will not be refcounted.
* This packet must be initially blank.
* @param size an upper bound of the size of the packet to encode
* @return non negative on success, negative error code on failure
*/
int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size);
/**
* Propagate user opaque values from the frame to avctx/pkt as needed.
*/
int ff_encode_reordered_opaque(AVCodecContext *avctx,
AVPacket *pkt, const AVFrame *frame);
int ff_encode_encode_cb(AVCodecContext *avctx, AVPacket *avpkt,
AVFrame *frame, int *got_packet);
/**
* Add a CPB properties side data to an encoding context.
*/
AVCPBProperties *ff_encode_add_cpb_side_data(AVCodecContext *avctx);
/**
* Rescale from sample rate to AVCodecContext.time_base.
*/
static av_always_inline int64_t ff_samples_to_time_base(const 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);
}
#endif /* AVCODEC_ENCODE_H */
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