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7ca3e520 VG |
1 | /* |
2 | * Vidvox Hap encoder | |
3 | * Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com> | |
4 | * | |
5 | * This file is part of Libav. | |
6 | * | |
7 | * Libav 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 | * Libav 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 Libav; 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 | * Hap encoder | |
25 | * | |
26 | * Fourcc: Hap1, Hap5, HapY | |
27 | * | |
28 | * https://github.com/Vidvox/hap/blob/master/documentation/HapVideoDRAFT.md | |
29 | */ | |
30 | ||
31 | #include <stdint.h> | |
32 | #include "snappy-c.h" | |
33 | ||
34 | #include "libavutil/frame.h" | |
35 | #include "libavutil/imgutils.h" | |
36 | #include "libavutil/intreadwrite.h" | |
37 | #include "libavutil/opt.h" | |
38 | ||
39 | #include "avcodec.h" | |
40 | #include "bytestream.h" | |
41 | #include "hap.h" | |
42 | #include "internal.h" | |
43 | #include "texturedsp.h" | |
44 | ||
45 | /* A fixed header size allows to skip a memcpy */ | |
46 | #define HEADER_SIZE 8 | |
47 | ||
48 | static void compress_texture(AVCodecContext *avctx, const AVFrame *f) | |
49 | { | |
50 | HapContext *ctx = avctx->priv_data; | |
51 | uint8_t *out = ctx->tex_buf; | |
52 | int i, j; | |
53 | ||
54 | for (j = 0; j < avctx->height; j += 4) { | |
55 | for (i = 0; i < avctx->width; i += 4) { | |
56 | uint8_t *p = f->data[0] + i * 4 + j * f->linesize[0]; | |
57 | const int step = ctx->tex_fun(out, f->linesize[0], p); | |
58 | out += step; | |
59 | } | |
60 | } | |
61 | } | |
62 | ||
63 | static int hap_encode(AVCodecContext *avctx, AVPacket *pkt, | |
64 | const AVFrame *frame, int *got_packet) | |
65 | { | |
66 | HapContext *ctx = avctx->priv_data; | |
67 | size_t final_size = ctx->max_snappy; | |
68 | int ret, comp = HAP_COMP_SNAPPY; | |
69 | int pktsize = FFMAX(ctx->tex_size, ctx->max_snappy) + HEADER_SIZE; | |
70 | ||
71 | /* Allocate maximum size packet, shrink later. */ | |
72 | ret = ff_alloc_packet(pkt, pktsize); | |
73 | if (ret < 0) | |
74 | return ret; | |
75 | ||
76 | /* DXTC compression. */ | |
77 | compress_texture(avctx, frame); | |
78 | ||
79 | /* Compress with snappy too, write directly on packet buffer. */ | |
80 | ret = snappy_compress(ctx->tex_buf, ctx->tex_size, | |
81 | pkt->data + HEADER_SIZE, &final_size); | |
82 | if (ret != SNAPPY_OK) { | |
83 | av_log(avctx, AV_LOG_ERROR, "Snappy compress error.\n"); | |
84 | return AVERROR_BUG; | |
85 | } | |
86 | ||
87 | /* If there is no gain from snappy, just use the raw texture. */ | |
88 | if (final_size > ctx->tex_size) { | |
89 | comp = HAP_COMP_NONE; | |
90 | av_log(avctx, AV_LOG_VERBOSE, | |
91 | "Snappy buffer bigger than uncompressed (%lu > %lu bytes).\n", | |
92 | final_size, ctx->tex_size); | |
93 | memcpy(pkt->data + HEADER_SIZE, ctx->tex_buf, ctx->tex_size); | |
94 | final_size = ctx->tex_size; | |
95 | } | |
96 | ||
97 | /* Write header at the start. */ | |
98 | AV_WL24(pkt->data, 0); | |
99 | AV_WL32(pkt->data + 4, final_size); | |
100 | pkt->data[3] = comp | ctx->section_type; | |
101 | ||
102 | av_shrink_packet(pkt, final_size + HEADER_SIZE); | |
103 | pkt->flags |= AV_PKT_FLAG_KEY; | |
104 | *got_packet = 1; | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static av_cold int hap_init(AVCodecContext *avctx) | |
109 | { | |
110 | HapContext *ctx = avctx->priv_data; | |
111 | int ratio; | |
112 | int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx); | |
113 | ||
114 | if (ret < 0) { | |
115 | av_log(avctx, AV_LOG_ERROR, "Invalid video size %dx%d.\n", | |
116 | avctx->width, avctx->height); | |
117 | return ret; | |
118 | } | |
119 | ||
120 | if (avctx->width % 4 || avctx->height % 4) { | |
121 | av_log(avctx, AV_LOG_ERROR, "Video size %dx%d is not multiple of 4.\n", | |
122 | avctx->width, avctx->height); | |
123 | return AVERROR_INVALIDDATA; | |
124 | } | |
125 | ||
126 | ff_texturedspenc_init(&ctx->dxtc); | |
127 | ||
128 | switch (ctx->section_type & 0x0F) { | |
129 | case HAP_FMT_RGBDXT1: | |
130 | ratio = 8; | |
131 | avctx->codec_tag = MKTAG('H', 'a', 'p', '1'); | |
132 | ctx->tex_fun = ctx->dxtc.dxt1_block; | |
133 | break; | |
134 | case HAP_FMT_RGBADXT5: | |
135 | ratio = 4; | |
136 | avctx->codec_tag = MKTAG('H', 'a', 'p', '5'); | |
137 | ctx->tex_fun = ctx->dxtc.dxt5_block; | |
138 | break; | |
139 | case HAP_FMT_YCOCGDXT5: | |
140 | ratio = 4; | |
141 | avctx->codec_tag = MKTAG('H', 'a', 'p', 'Y'); | |
142 | ctx->tex_fun = ctx->dxtc.dxt5ys_block; | |
143 | break; | |
144 | default: | |
145 | av_log(avctx, AV_LOG_ERROR, "Invalid format %02X\n", ctx->section_type); | |
146 | return AVERROR_INVALIDDATA; | |
147 | } | |
148 | ||
149 | /* Texture compression ratio is constant, so can we computer | |
150 | * beforehand the final size of the uncompressed buffer. */ | |
151 | ctx->tex_size = FFALIGN(avctx->width, TEXTURE_BLOCK_W) * | |
152 | FFALIGN(avctx->height, TEXTURE_BLOCK_H) * 4 / ratio; | |
153 | ctx->max_snappy = snappy_max_compressed_length(ctx->tex_size); | |
154 | ||
155 | ctx->tex_buf = av_malloc(ctx->tex_size); | |
156 | if (!ctx->tex_buf) | |
157 | return AVERROR(ENOMEM); | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static av_cold int hap_close(AVCodecContext *avctx) | |
163 | { | |
164 | HapContext *ctx = avctx->priv_data; | |
165 | ||
166 | av_freep(&ctx->tex_buf); | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
171 | #define OFFSET(x) offsetof(HapContext, x) | |
172 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM | |
173 | static const AVOption options[] = { | |
174 | { "format", NULL, OFFSET(section_type), AV_OPT_TYPE_INT, { .i64 = HAP_FMT_RGBDXT1 }, HAP_FMT_RGBDXT1, HAP_FMT_YCOCGDXT5, FLAGS, "format" }, | |
175 | { "hap", "Hap 1 (DXT1 textures)", 0, AV_OPT_TYPE_CONST, { .i64 = HAP_FMT_RGBDXT1 }, 0, 0, FLAGS, "format" }, | |
176 | { "hap_alpha", "Hap Alpha (DXT5 textures)", 0, AV_OPT_TYPE_CONST, { .i64 = HAP_FMT_RGBADXT5 }, 0, 0, FLAGS, "format" }, | |
177 | { "hap_q", "Hap Q (DXT5-YCoCg textures)", 0, AV_OPT_TYPE_CONST, { .i64 = HAP_FMT_YCOCGDXT5 }, 0, 0, FLAGS, "format" }, | |
178 | ||
179 | { NULL }, | |
180 | }; | |
181 | ||
182 | static const AVClass hapenc_class = { | |
183 | .class_name = "Hap encoder", | |
184 | .item_name = av_default_item_name, | |
185 | .option = options, | |
186 | .version = LIBAVUTIL_VERSION_INT, | |
187 | }; | |
188 | ||
189 | AVCodec ff_hap_encoder = { | |
190 | .name = "hap", | |
191 | .long_name = NULL_IF_CONFIG_SMALL("Vidvox Hap encoder"), | |
192 | .type = AVMEDIA_TYPE_VIDEO, | |
193 | .id = AV_CODEC_ID_HAP, | |
194 | .priv_data_size = sizeof(HapContext), | |
195 | .priv_class = &hapenc_class, | |
196 | .init = hap_init, | |
197 | .encode2 = hap_encode, | |
198 | .close = hap_close, | |
199 | .pix_fmts = (const enum AVPixelFormat[]) { | |
200 | AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE, | |
201 | }, | |
202 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | | |
203 | FF_CODEC_CAP_INIT_CLEANUP, | |
204 | }; |