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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 "internal.h" | |
32 | #include "put_bits.h" | |
33 | ||
34 | typedef struct CLJRContext { | |
35 | AVClass *avclass; | |
36 | int dither_type; | |
37 | } CLJRContext; | |
38 | ||
39 | static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, | |
40 | const AVFrame *p, int *got_packet) | |
41 | { | |
42 | CLJRContext *a = avctx->priv_data; | |
43 | PutBitContext pb; | |
44 | int x, y, ret; | |
45 | uint32_t dither= avctx->frame_number; | |
46 | static const uint32_t ordered_dither[2][2] = | |
47 | { | |
48 | { 0x10400000, 0x104F0000 }, | |
49 | { 0xCB2A0000, 0xCB250000 }, | |
50 | }; | |
51 | ||
52 | if (avctx->width%4 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) { | |
53 | av_log(avctx, AV_LOG_ERROR, | |
54 | "Widths which are not a multiple of 4 might fail with some decoders, " | |
55 | "use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->width); | |
56 | return AVERROR_EXPERIMENTAL; | |
57 | } | |
58 | ||
59 | if ((ret = ff_alloc_packet2(avctx, pkt, 32*avctx->height*avctx->width/4)) < 0) | |
60 | return ret; | |
61 | ||
62 | init_put_bits(&pb, pkt->data, pkt->size); | |
63 | ||
64 | for (y = 0; y < avctx->height; y++) { | |
65 | uint8_t *luma = &p->data[0][y * p->linesize[0]]; | |
66 | uint8_t *cb = &p->data[1][y * p->linesize[1]]; | |
67 | uint8_t *cr = &p->data[2][y * p->linesize[2]]; | |
68 | uint8_t luma_tmp[4]; | |
69 | for (x = 0; x < avctx->width; x += 4) { | |
70 | switch (a->dither_type) { | |
71 | case 0: dither = 0x492A0000; break; | |
72 | case 1: dither = dither * 1664525 + 1013904223; break; | |
73 | case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break; | |
74 | } | |
75 | if (x+3 >= avctx->width) { | |
76 | memset(luma_tmp, 0, sizeof(luma_tmp)); | |
77 | memcpy(luma_tmp, luma, avctx->width - x); | |
78 | luma = luma_tmp; | |
79 | } | |
80 | put_bits(&pb, 5, (249*(luma[3] + (dither>>29) )) >> 11); | |
81 | put_bits(&pb, 5, (249*(luma[2] + ((dither>>26)&7))) >> 11); | |
82 | put_bits(&pb, 5, (249*(luma[1] + ((dither>>23)&7))) >> 11); | |
83 | put_bits(&pb, 5, (249*(luma[0] + ((dither>>20)&7))) >> 11); | |
84 | luma += 4; | |
85 | put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10); | |
86 | put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10); | |
87 | } | |
88 | } | |
89 | ||
90 | flush_put_bits(&pb); | |
91 | ||
92 | pkt->size = put_bits_count(&pb) / 8; | |
93 | pkt->flags |= AV_PKT_FLAG_KEY; | |
94 | *got_packet = 1; | |
95 | return 0; | |
96 | } | |
97 | ||
98 | #define OFFSET(x) offsetof(CLJRContext, x) | |
99 | #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM | |
100 | static const AVOption options[] = { | |
101 | { "dither_type", "Dither type", OFFSET(dither_type), AV_OPT_TYPE_INT, { .i64=1 }, 0, 2, VE}, | |
102 | { NULL }, | |
103 | }; | |
104 | ||
105 | static const AVClass cljr_class = { | |
106 | .class_name = "cljr encoder", | |
107 | .item_name = av_default_item_name, | |
108 | .option = options, | |
109 | .version = LIBAVUTIL_VERSION_INT, | |
110 | }; | |
111 | ||
112 | AVCodec ff_cljr_encoder = { | |
113 | .name = "cljr", | |
114 | .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), | |
115 | .type = AVMEDIA_TYPE_VIDEO, | |
116 | .id = AV_CODEC_ID_CLJR, | |
117 | .priv_data_size = sizeof(CLJRContext), | |
118 | .encode2 = encode_frame, | |
119 | .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P, | |
120 | AV_PIX_FMT_NONE }, | |
121 | .priv_class = &cljr_class, | |
122 | }; |