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1 | /* |
2 | * Alias PIX image encoder | |
3 | * Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com> | |
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 | #include "libavutil/intreadwrite.h" | |
23 | ||
24 | #include "avcodec.h" | |
25 | #include "bytestream.h" | |
26 | #include "internal.h" | |
27 | ||
28 | #define ALIAS_HEADER_SIZE 10 | |
29 | ||
30 | static av_cold int encode_init(AVCodecContext *avctx) | |
31 | { | |
32 | avctx->coded_frame = av_frame_alloc(); | |
33 | if (!avctx->coded_frame) | |
34 | return AVERROR(ENOMEM); | |
35 | return 0; | |
36 | } | |
37 | ||
38 | static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, | |
39 | const AVFrame *frame, int *got_packet) | |
40 | { | |
41 | int width, height, bits_pixel, i, j, length, ret; | |
42 | uint8_t *in_buf, *buf; | |
43 | ||
44 | avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; | |
45 | avctx->coded_frame->key_frame = 1; | |
46 | ||
47 | width = avctx->width; | |
48 | height = avctx->height; | |
49 | ||
50 | if (width > 65535 || height > 65535 || | |
51 | width * height >= INT_MAX / 4 - ALIAS_HEADER_SIZE) { | |
52 | av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n", width, height); | |
53 | return AVERROR_INVALIDDATA; | |
54 | } | |
55 | ||
56 | switch (avctx->pix_fmt) { | |
57 | case AV_PIX_FMT_GRAY8: | |
58 | bits_pixel = 8; | |
59 | break; | |
60 | case AV_PIX_FMT_BGR24: | |
61 | bits_pixel = 24; | |
62 | break; | |
63 | default: | |
64 | return AVERROR(EINVAL); | |
65 | } | |
66 | ||
67 | length = ALIAS_HEADER_SIZE + 4 * width * height; // max possible | |
68 | if ((ret = ff_alloc_packet(pkt, length)) < 0) { | |
69 | av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", length); | |
70 | return ret; | |
71 | } | |
72 | ||
73 | buf = pkt->data; | |
74 | ||
75 | /* Encode header. */ | |
76 | bytestream_put_be16(&buf, width); | |
77 | bytestream_put_be16(&buf, height); | |
78 | bytestream_put_be32(&buf, 0); /* X, Y offset */ | |
79 | bytestream_put_be16(&buf, bits_pixel); | |
80 | ||
81 | for (j = 0; j < height; j++) { | |
82 | in_buf = frame->data[0] + frame->linesize[0] * j; | |
83 | for (i = 0; i < width; ) { | |
84 | int count = 0; | |
85 | int pixel; | |
86 | ||
87 | if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) { | |
88 | pixel = *in_buf; | |
89 | while (count < 255 && count + i < width && pixel == *in_buf) { | |
90 | count++; | |
91 | in_buf++; | |
92 | } | |
93 | bytestream_put_byte(&buf, count); | |
94 | bytestream_put_byte(&buf, pixel); | |
95 | } else { /* AV_PIX_FMT_BGR24 */ | |
96 | pixel = AV_RB24(in_buf); | |
97 | while (count < 255 && count + i < width && | |
98 | pixel == AV_RB24(in_buf)) { | |
99 | count++; | |
100 | in_buf += 3; | |
101 | } | |
102 | bytestream_put_byte(&buf, count); | |
103 | bytestream_put_be24(&buf, pixel); | |
104 | } | |
105 | i += count; | |
106 | } | |
107 | } | |
108 | ||
109 | /* Total length */ | |
110 | av_shrink_packet(pkt, buf - pkt->data); | |
111 | pkt->flags |= AV_PKT_FLAG_KEY; | |
112 | *got_packet = 1; | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static av_cold int encode_close(AVCodecContext *avctx) | |
118 | { | |
119 | av_frame_free(&avctx->coded_frame); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | AVCodec ff_alias_pix_encoder = { | |
124 | .name = "alias_pix", | |
125 | .long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"), | |
126 | .type = AVMEDIA_TYPE_VIDEO, | |
127 | .id = AV_CODEC_ID_ALIAS_PIX, | |
128 | .init = encode_init, | |
129 | .encode2 = encode_frame, | |
130 | .close = encode_close, | |
131 | .pix_fmts = (const enum AVPixelFormat[]) { | |
132 | AV_PIX_FMT_BGR24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE | |
133 | }, | |
134 | }; |