Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / aliaspixenc.c
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 };