/* * 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",    CODEC_LONG_NAME("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 |                      AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,    .init           = encode_init,    FF_CODEC_ENCODE_CB(encode_frame),    .p.pix_fmts     = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV422P10,                                                    AV_PIX_FMT_NONE },};