FFmpeg/libavcodec/bitpacked_enc.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

120 lines
3.6 KiB
C

/*
* bitpacked encoder
*
* Copyright (c) 2021 Limin Wang
*
* 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
*/
#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "internal.h"
#include "put_bits.h"
#include "libavutil/pixdesc.h"
struct BitpackedContext {
int (*encode)(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame);
};
static int encode_yuv422p10(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame)
{
const int buf_size = avctx->height * avctx->width * avctx->bits_per_coded_sample / 8;
int ret;
uint8_t *dst;
const uint16_t *y;
const uint16_t *u;
const uint16_t *v;
PutBitContext pb;
ret = ff_get_encode_buffer(avctx, pkt, buf_size, 0);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
return ret;
}
dst = pkt->data;
init_put_bits(&pb, dst, buf_size);
for (int i = 0; i < avctx->height; i++) {
y = (uint16_t*)(frame->data[0] + i * frame->linesize[0]);
u = (uint16_t*)(frame->data[1] + i * frame->linesize[1]);
v = (uint16_t*)(frame->data[2] + i * frame->linesize[2]);
for (int j = 0; j < avctx->width; j += 2) {
/* u, y0, v, y1 */
put_bits(&pb, 10, av_clip_uintp2(*u++, 10));
put_bits(&pb, 10, av_clip_uintp2(*y++, 10));
put_bits(&pb, 10, av_clip_uintp2(*v++, 10));
put_bits(&pb, 10, av_clip_uintp2(*y++, 10));
}
}
flush_put_bits(&pb);
return 0;
}
static av_cold int encode_init(AVCodecContext *avctx)
{
struct BitpackedContext *s = avctx->priv_data;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
if (avctx->width & 1) {
av_log(avctx, AV_LOG_ERROR, "bitpacked needs even width\n");
return AVERROR(EINVAL);
}
avctx->bits_per_coded_sample = av_get_bits_per_pixel(desc);
avctx->bit_rate = ff_guess_coded_bitrate(avctx);
if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
s->encode = encode_yuv422p10;
else
return AVERROR(EINVAL);
return 0;
}
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *frame, int *got_packet)
{
struct BitpackedContext *s = avctx->priv_data;
int ret;
ret = s->encode(avctx, pkt, frame);
if (ret)
return ret;
*got_packet = 1;
return 0;
}
const FFCodec ff_bitpacked_encoder = {
.p.name = "bitpacked",
.p.long_name = NULL_IF_CONFIG_SMALL("Bitpacked"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_BITPACKED,
.priv_data_size = sizeof(struct BitpackedContext),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.init = encode_init,
.encode2 = encode_frame,
.p.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV422P10,
AV_PIX_FMT_NONE },
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};