1 /*
2 * bitpacked encoder
3 *
4 * Copyright (c) 2021 Limin Wang
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "avcodec.h"
24 #include "codec_internal.h"
25 #include "encode.h"
26 #include "internal.h"
27 #include "put_bits.h"
28 #include "libavutil/pixdesc.h"
29
30 struct BitpackedContext {
31 int (*encode)(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame);
32 };
33
encode_yuv422p10(AVCodecContext * avctx,AVPacket * pkt,const AVFrame * frame)34 static int encode_yuv422p10(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame)
35 {
36 const int buf_size = avctx->height * avctx->width * avctx->bits_per_coded_sample / 8;
37 int ret;
38 uint8_t *dst;
39 const uint16_t *y;
40 const uint16_t *u;
41 const uint16_t *v;
42 PutBitContext pb;
43
44 ret = ff_get_encode_buffer(avctx, pkt, buf_size, 0);
45 if (ret < 0) {
46 av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
47 return ret;
48 }
49 dst = pkt->data;
50
51 init_put_bits(&pb, dst, buf_size);
52
53 for (int i = 0; i < avctx->height; i++) {
54 y = (uint16_t*)(frame->data[0] + i * frame->linesize[0]);
55 u = (uint16_t*)(frame->data[1] + i * frame->linesize[1]);
56 v = (uint16_t*)(frame->data[2] + i * frame->linesize[2]);
57
58 for (int j = 0; j < avctx->width; j += 2) {
59 /* u, y0, v, y1 */
60 put_bits(&pb, 10, av_clip_uintp2(*u++, 10));
61 put_bits(&pb, 10, av_clip_uintp2(*y++, 10));
62 put_bits(&pb, 10, av_clip_uintp2(*v++, 10));
63 put_bits(&pb, 10, av_clip_uintp2(*y++, 10));
64 }
65 }
66 flush_put_bits(&pb);
67
68 return 0;
69 }
70
71
encode_init(AVCodecContext * avctx)72 static av_cold int encode_init(AVCodecContext *avctx)
73 {
74 struct BitpackedContext *s = avctx->priv_data;
75 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
76
77 if (avctx->width & 1) {
78 av_log(avctx, AV_LOG_ERROR, "bitpacked needs even width\n");
79 return AVERROR(EINVAL);
80 }
81
82 avctx->bits_per_coded_sample = av_get_bits_per_pixel(desc);
83 avctx->bit_rate = ff_guess_coded_bitrate(avctx);
84
85 if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
86 s->encode = encode_yuv422p10;
87 else
88 return AVERROR(EINVAL);
89
90 return 0;
91 }
92
encode_frame(AVCodecContext * avctx,AVPacket * pkt,const AVFrame * frame,int * got_packet)93 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
94 const AVFrame *frame, int *got_packet)
95 {
96 struct BitpackedContext *s = avctx->priv_data;
97 int ret;
98
99 ret = s->encode(avctx, pkt, frame);
100 if (ret)
101 return ret;
102
103 *got_packet = 1;
104 return 0;
105 }
106
107 const FFCodec ff_bitpacked_encoder = {
108 .p.name = "bitpacked",
109 .p.long_name = NULL_IF_CONFIG_SMALL("Bitpacked"),
110 .p.type = AVMEDIA_TYPE_VIDEO,
111 .p.id = AV_CODEC_ID_BITPACKED,
112 .priv_data_size = sizeof(struct BitpackedContext),
113 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
114 .init = encode_init,
115 FF_CODEC_ENCODE_CB(encode_frame),
116 .p.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV422P10,
117 AV_PIX_FMT_NONE },
118 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
119 };
120