1
0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-12 19:18:44 +02:00
FFmpeg/libavcodec/encode.h

89 lines
3.1 KiB
C
Raw Normal View History

/*
* 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"
/**
* 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);
avcodec/encode, frame_thread_encoder: Unify calling encode callback The encode-callback (the callback used by the FF_CODEC_CB_TYPE_ENCODE encoders) is currently called in two places: encode_simple_internal() and by the worker threads of frame-threaded encoders. After the call, some packet properties are set based upon the corresponding AVFrame properties and the packet is made refcounted if it isn't already. So there is some code duplication. There was also non-duplicated code in encode_simple_internal() which is executed even when using frame-threading. This included an emms_c() (which is needed for frame-threading, too, if it is needed for the single-threaded case, because there are allocations (via av_packet_make_refcounted()) immediately after returning from the encode-callback). Furthermore, some further properties are only set in encode_simple_internal(): For audio, pts and duration are derived from the corresponding fields of the frame if the encoder does not have the AV_CODEC_CAP_DELAY set. Yet this is wrong for frame-threaded encoders, because frame-threading always introduces delay regardless of whether the underlying codec has said cap. This only worked because there are no frame-threaded audio encoders. This commit fixes the code duplication and the above issue by factoring this code out and reusing it in both places. It would work in case of audio codecs with frame-threading, because now the values are derived from the correct AVFrame. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-08-23 23:26:57 +02:00
int ff_encode_encode_cb(AVCodecContext *avctx, AVPacket *avpkt,
AVFrame *frame, int *got_packet);
avcodec/encode, frame_thread_encoder: Unify calling encode callback The encode-callback (the callback used by the FF_CODEC_CB_TYPE_ENCODE encoders) is currently called in two places: encode_simple_internal() and by the worker threads of frame-threaded encoders. After the call, some packet properties are set based upon the corresponding AVFrame properties and the packet is made refcounted if it isn't already. So there is some code duplication. There was also non-duplicated code in encode_simple_internal() which is executed even when using frame-threading. This included an emms_c() (which is needed for frame-threading, too, if it is needed for the single-threaded case, because there are allocations (via av_packet_make_refcounted()) immediately after returning from the encode-callback). Furthermore, some further properties are only set in encode_simple_internal(): For audio, pts and duration are derived from the corresponding fields of the frame if the encoder does not have the AV_CODEC_CAP_DELAY set. Yet this is wrong for frame-threaded encoders, because frame-threading always introduces delay regardless of whether the underlying codec has said cap. This only worked because there are no frame-threaded audio encoders. This commit fixes the code duplication and the above issue by factoring this code out and reusing it in both places. It would work in case of audio codecs with frame-threading, because now the values are derived from the correct AVFrame. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-08-23 23:26:57 +02:00
/**
* 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 */