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