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4243da4ff4
This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
120 lines
3.6 KiB
C
120 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 "codec_internal.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 FFCodec ff_bitpacked_encoder = {
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.p.name = "bitpacked",
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.p.long_name = NULL_IF_CONFIG_SMALL("Bitpacked"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_BITPACKED,
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.priv_data_size = sizeof(struct BitpackedContext),
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
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.init = encode_init,
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FF_CODEC_ENCODE_CB(encode_frame),
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.p.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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