blob: e67eee4f7d8f0f515ecd921ffed965aaf3ddf46a
1 | /* |
2 | * ZeroCodec Decoder |
3 | * |
4 | * Copyright (c) 2012, Derek Buitenhuis |
5 | * |
6 | * Permission to use, copy, modify, and/or distribute this software for any |
7 | * purpose with or without fee is hereby granted, provided that the above |
8 | * copyright notice and this permission notice appear in all copies. |
9 | * |
10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 | */ |
18 | |
19 | #include <zlib.h> |
20 | |
21 | #include "avcodec.h" |
22 | #include "internal.h" |
23 | #include "libavutil/common.h" |
24 | |
25 | typedef struct ZeroCodecContext { |
26 | AVFrame *previous_frame; |
27 | z_stream zstream; |
28 | } ZeroCodecContext; |
29 | |
30 | static int zerocodec_decode_frame(AVCodecContext *avctx, void *data, |
31 | int *got_frame, AVPacket *avpkt) |
32 | { |
33 | ZeroCodecContext *zc = avctx->priv_data; |
34 | AVFrame *pic = data; |
35 | AVFrame *prev_pic = zc->previous_frame; |
36 | z_stream *zstream = &zc->zstream; |
37 | uint8_t *prev = prev_pic->data[0]; |
38 | uint8_t *dst; |
39 | int i, j, zret, ret; |
40 | |
41 | if (avpkt->flags & AV_PKT_FLAG_KEY) { |
42 | pic->key_frame = 1; |
43 | pic->pict_type = AV_PICTURE_TYPE_I; |
44 | } else { |
45 | if (!prev) { |
46 | av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n"); |
47 | return AVERROR_INVALIDDATA; |
48 | } |
49 | |
50 | prev += (avctx->height - 1) * prev_pic->linesize[0]; |
51 | |
52 | pic->key_frame = 0; |
53 | pic->pict_type = AV_PICTURE_TYPE_P; |
54 | } |
55 | |
56 | zret = inflateReset(zstream); |
57 | if (zret != Z_OK) { |
58 | av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret); |
59 | return AVERROR_INVALIDDATA; |
60 | } |
61 | |
62 | if ((ret = ff_get_buffer(avctx, pic, AV_GET_BUFFER_FLAG_REF)) < 0) |
63 | return ret; |
64 | |
65 | zstream->next_in = avpkt->data; |
66 | zstream->avail_in = avpkt->size; |
67 | |
68 | dst = pic->data[0] + (avctx->height - 1) * pic->linesize[0]; |
69 | |
70 | /** |
71 | * ZeroCodec has very simple interframe compression. If a value |
72 | * is the same as the previous frame, set it to 0. |
73 | */ |
74 | |
75 | for (i = 0; i < avctx->height; i++) { |
76 | zstream->next_out = dst; |
77 | zstream->avail_out = avctx->width << 1; |
78 | |
79 | zret = inflate(zstream, Z_SYNC_FLUSH); |
80 | if (zret != Z_OK && zret != Z_STREAM_END) { |
81 | av_log(avctx, AV_LOG_ERROR, |
82 | "Inflate failed with return code: %d.\n", zret); |
83 | return AVERROR_INVALIDDATA; |
84 | } |
85 | |
86 | if (!(avpkt->flags & AV_PKT_FLAG_KEY)) |
87 | for (j = 0; j < avctx->width << 1; j++) |
88 | dst[j] += prev[j] & -!dst[j]; |
89 | |
90 | prev -= prev_pic->linesize[0]; |
91 | dst -= pic->linesize[0]; |
92 | } |
93 | |
94 | av_frame_unref(zc->previous_frame); |
95 | if ((ret = av_frame_ref(zc->previous_frame, pic)) < 0) |
96 | return ret; |
97 | |
98 | *got_frame = 1; |
99 | |
100 | return avpkt->size; |
101 | } |
102 | |
103 | static av_cold int zerocodec_decode_close(AVCodecContext *avctx) |
104 | { |
105 | ZeroCodecContext *zc = avctx->priv_data; |
106 | |
107 | av_frame_free(&zc->previous_frame); |
108 | |
109 | inflateEnd(&zc->zstream); |
110 | |
111 | return 0; |
112 | } |
113 | |
114 | static av_cold int zerocodec_decode_init(AVCodecContext *avctx) |
115 | { |
116 | ZeroCodecContext *zc = avctx->priv_data; |
117 | z_stream *zstream = &zc->zstream; |
118 | int zret; |
119 | |
120 | avctx->pix_fmt = AV_PIX_FMT_UYVY422; |
121 | avctx->bits_per_raw_sample = 8; |
122 | |
123 | zstream->zalloc = Z_NULL; |
124 | zstream->zfree = Z_NULL; |
125 | zstream->opaque = Z_NULL; |
126 | |
127 | zret = inflateInit(zstream); |
128 | if (zret != Z_OK) { |
129 | av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d.\n", zret); |
130 | return AVERROR(ENOMEM); |
131 | } |
132 | |
133 | zc->previous_frame = av_frame_alloc(); |
134 | if (!zc->previous_frame) { |
135 | zerocodec_decode_close(avctx); |
136 | return AVERROR(ENOMEM); |
137 | } |
138 | |
139 | return 0; |
140 | } |
141 | |
142 | AVCodec ff_zerocodec_decoder = { |
143 | .type = AVMEDIA_TYPE_VIDEO, |
144 | .name = "zerocodec", |
145 | .long_name = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"), |
146 | .id = AV_CODEC_ID_ZEROCODEC, |
147 | .priv_data_size = sizeof(ZeroCodecContext), |
148 | .init = zerocodec_decode_init, |
149 | .decode = zerocodec_decode_frame, |
150 | .close = zerocodec_decode_close, |
151 | .capabilities = AV_CODEC_CAP_DR1, |
152 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
153 | }; |
154 |