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100 lines
3.4 KiB
C
100 lines
3.4 KiB
C
/*
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* generic encoding-related code
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_ENCODE_H
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#define AVCODEC_ENCODE_H
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#include "libavutil/frame.h"
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#include "avcodec.h"
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#include "packet.h"
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/**
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* avcodec_receive_frame() implementation for encoders.
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*/
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int ff_encode_receive_frame(AVCodecContext *avctx, AVFrame *frame);
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/**
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* Called by encoders to get the next frame for encoding.
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*
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* @param frame An empty frame to be filled with data.
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* @return 0 if a new reference has been successfully written to frame
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* AVERROR(EAGAIN) if no data is currently available
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* AVERROR_EOF if end of stream has been reached, so no more data
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* will be available
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*/
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int ff_encode_get_frame(AVCodecContext *avctx, AVFrame *frame);
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/**
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* Get a buffer for a packet. This is a wrapper around
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* AVCodecContext.get_encode_buffer() and should be used instead calling get_encode_buffer()
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* directly.
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*/
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int ff_get_encode_buffer(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int flags);
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/**
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* Allocate buffers for a frame. Encoder equivalent to ff_get_buffer().
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*/
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int ff_encode_alloc_frame(AVCodecContext *avctx, AVFrame *frame);
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/**
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* Check AVPacket size and allocate data.
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*
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* Encoders of type FF_CODEC_CB_TYPE_ENCODE can use this as a convenience to
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* obtain a big enough buffer for the encoded bitstream.
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*
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* @param avctx the AVCodecContext of the encoder
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* @param avpkt The AVPacket: on success, avpkt->data will point to a buffer
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* of size at least `size`; the packet will not be refcounted.
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* This packet must be initially blank.
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* @param size an upper bound of the size of the packet to encode
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* @return non negative on success, negative error code on failure
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*/
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int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size);
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/**
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* Propagate user opaque values from the frame to avctx/pkt as needed.
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*/
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int ff_encode_reordered_opaque(AVCodecContext *avctx,
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AVPacket *pkt, const AVFrame *frame);
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/*
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* Perform encoder initialization and validation.
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* Called when opening the encoder, before the FFCodec.init() call.
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*/
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int ff_encode_preinit(AVCodecContext *avctx);
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int ff_encode_encode_cb(AVCodecContext *avctx, AVPacket *avpkt,
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AVFrame *frame, int *got_packet);
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/**
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* Rescale from sample rate to AVCodecContext.time_base.
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*/
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static av_always_inline int64_t ff_samples_to_time_base(const AVCodecContext *avctx,
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int64_t samples)
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{
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if (samples == AV_NOPTS_VALUE)
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return AV_NOPTS_VALUE;
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return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
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avctx->time_base);
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}
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#endif /* AVCODEC_ENCODE_H */
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