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/*
* 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 "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 AVCodec ff_bitpacked_encoder = {
.name = "bitpacked",
.long_name = NULL_IF_CONFIG_SMALL("Bitpacked"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_BITPACKED,
.priv_data_size = sizeof(struct BitpackedContext),
.capabilities = AV_CODEC_CAP_DR1,
.init = encode_init,
.encode2 = encode_frame,
.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV422P10,
AV_PIX_FMT_NONE },
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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