FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/cljrenc.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 29 34 85.3%
Branches: 11 16 68.8%

Line Branch Exec Source
1 /*
2 * Cirrus Logic AccuPak (CLJR) encoder
3 * Copyright (c) 2003 Alex Beregszaszi
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Cirrus Logic AccuPak encoder.
25 */
26
27 #include "libavutil/common.h"
28 #include "libavutil/opt.h"
29
30 #include "avcodec.h"
31 #include "encode.h"
32 #include "internal.h"
33 #include "put_bits.h"
34
35 typedef struct CLJRContext {
36 AVClass *avclass;
37 int dither_type;
38 } CLJRContext;
39
40 200 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
41 const AVFrame *p, int *got_packet)
42 {
43 200 CLJRContext *a = avctx->priv_data;
44 PutBitContext pb;
45 int x, y, ret;
46 200 uint32_t dither= avctx->frame_number;
47 static const uint32_t ordered_dither[2][2] =
48 {
49 { 0x10400000, 0x104F0000 },
50 { 0xCB2A0000, 0xCB250000 },
51 };
52
53
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200 if (avctx->width%4 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
54 av_log(avctx, AV_LOG_ERROR,
55 "Widths which are not a multiple of 4 might fail with some decoders, "
56 "use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->width);
57 return AVERROR_EXPERIMENTAL;
58 }
59
60 200 ret = ff_get_encode_buffer(avctx, pkt, 4 * avctx->height * ((avctx->width + 3) / 4), 0);
61
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200 if (ret < 0)
62 return ret;
63
64 200 init_put_bits(&pb, pkt->data, pkt->size);
65
66
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45100 for (y = 0; y < avctx->height; y++) {
67 44900 uint8_t *luma = &p->data[0][y * p->linesize[0]];
68 44900 uint8_t *cb = &p->data[1][y * p->linesize[1]];
69 44900 uint8_t *cr = &p->data[2][y * p->linesize[2]];
70 uint8_t luma_tmp[4];
71
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3861800 for (x = 0; x < avctx->width; x += 4) {
72
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3816900 switch (a->dither_type) {
73 case 0: dither = 0x492A0000; break;
74 3816900 case 1: dither = dither * 1664525 + 1013904223; break;
75 case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break;
76 }
77
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3816900 if (x+3 >= avctx->width) {
78 1700 memset(luma_tmp, 0, sizeof(luma_tmp));
79 1700 memcpy(luma_tmp, luma, avctx->width - x);
80 1700 luma = luma_tmp;
81 }
82 3816900 put_bits(&pb, 5, (249*(luma[3] + (dither>>29) )) >> 11);
83 3816900 put_bits(&pb, 5, (249*(luma[2] + ((dither>>26)&7))) >> 11);
84 3816900 put_bits(&pb, 5, (249*(luma[1] + ((dither>>23)&7))) >> 11);
85 3816900 put_bits(&pb, 5, (249*(luma[0] + ((dither>>20)&7))) >> 11);
86 3816900 luma += 4;
87 3816900 put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10);
88 3816900 put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10);
89 }
90 }
91
92 200 flush_put_bits(&pb);
93
94 200 pkt->flags |= AV_PKT_FLAG_KEY;
95 200 *got_packet = 1;
96 200 return 0;
97 }
98
99 #define OFFSET(x) offsetof(CLJRContext, x)
100 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
101 static const AVOption options[] = {
102 { "dither_type", "Dither type", OFFSET(dither_type), AV_OPT_TYPE_INT, { .i64=1 }, 0, 2, VE},
103 { NULL },
104 };
105
106 static const AVClass cljr_class = {
107 .class_name = "cljr encoder",
108 .item_name = av_default_item_name,
109 .option = options,
110 .version = LIBAVUTIL_VERSION_INT,
111 };
112
113 const AVCodec ff_cljr_encoder = {
114 .name = "cljr",
115 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
116 .type = AVMEDIA_TYPE_VIDEO,
117 .id = AV_CODEC_ID_CLJR,
118 .capabilities = AV_CODEC_CAP_DR1,
119 .priv_data_size = sizeof(CLJRContext),
120 .encode2 = encode_frame,
121 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
122 AV_PIX_FMT_NONE },
123 .priv_class = &cljr_class,
124 };
125