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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 "codec_internal.h" | ||
23 | #include "decode.h" | ||
24 | #include "zlib_wrapper.h" | ||
25 | #include "libavutil/attributes.h" | ||
26 | #include "libavutil/common.h" | ||
27 | |||
28 | typedef struct ZeroCodecContext { | ||
29 | AVFrame *previous_frame; | ||
30 | FFZStream zstream; | ||
31 | } ZeroCodecContext; | ||
32 | |||
33 | 38 | static int zerocodec_decode_frame(AVCodecContext *avctx, AVFrame *pic, | |
34 | int *got_frame, AVPacket *avpkt) | ||
35 | { | ||
36 | 38 | ZeroCodecContext *zc = avctx->priv_data; | |
37 | 38 | AVFrame *prev_pic = zc->previous_frame; | |
38 | 38 | z_stream *const zstream = &zc->zstream.zstream; | |
39 | 38 | uint8_t *prev = prev_pic->data[0]; | |
40 | uint8_t *dst; | ||
41 | int i, j, zret, ret; | ||
42 | |||
43 |
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38 | if (avpkt->flags & AV_PKT_FLAG_KEY) { |
44 | 3 | pic->flags |= AV_FRAME_FLAG_KEY; | |
45 | 3 | pic->pict_type = AV_PICTURE_TYPE_I; | |
46 | } else { | ||
47 |
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35 | if (!prev) { |
48 | ✗ | av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n"); | |
49 | ✗ | return AVERROR_INVALIDDATA; | |
50 | } | ||
51 | |||
52 | 35 | prev += (avctx->height - 1) * prev_pic->linesize[0]; | |
53 | |||
54 | 35 | pic->flags &= ~AV_FRAME_FLAG_KEY; | |
55 | 35 | pic->pict_type = AV_PICTURE_TYPE_P; | |
56 | } | ||
57 | |||
58 | 38 | zret = inflateReset(zstream); | |
59 |
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38 | if (zret != Z_OK) { |
60 | ✗ | av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret); | |
61 | ✗ | return AVERROR_INVALIDDATA; | |
62 | } | ||
63 | |||
64 |
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38 | if ((ret = ff_get_buffer(avctx, pic, AV_GET_BUFFER_FLAG_REF)) < 0) |
65 | ✗ | return ret; | |
66 | |||
67 | 38 | zstream->next_in = avpkt->data; | |
68 | 38 | zstream->avail_in = avpkt->size; | |
69 | |||
70 | 38 | dst = pic->data[0] + (avctx->height - 1) * pic->linesize[0]; | |
71 | |||
72 | /** | ||
73 | * ZeroCodec has very simple interframe compression. If a value | ||
74 | * is the same as the previous frame, set it to 0. | ||
75 | */ | ||
76 | |||
77 |
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27398 | for (i = 0; i < avctx->height; i++) { |
78 | 27360 | zstream->next_out = dst; | |
79 | 27360 | zstream->avail_out = avctx->width << 1; | |
80 | |||
81 | 27360 | zret = inflate(zstream, Z_SYNC_FLUSH); | |
82 |
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27360 | if (zret != Z_OK && zret != Z_STREAM_END) { |
83 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
84 | "Inflate failed with return code: %d.\n", zret); | ||
85 | ✗ | return AVERROR_INVALIDDATA; | |
86 | } | ||
87 | |||
88 |
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27360 | if (!(avpkt->flags & AV_PKT_FLAG_KEY)) { |
89 |
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64537200 | for (j = 0; j < avctx->width << 1; j++) |
90 | 64512000 | dst[j] += prev[j] & -!dst[j]; | |
91 | 25200 | prev -= prev_pic->linesize[0]; | |
92 | } | ||
93 | |||
94 | 27360 | dst -= pic->linesize[0]; | |
95 | } | ||
96 | |||
97 |
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38 | if ((ret = av_frame_replace(zc->previous_frame, pic)) < 0) |
98 | ✗ | return ret; | |
99 | |||
100 | 38 | *got_frame = 1; | |
101 | |||
102 | 38 | return avpkt->size; | |
103 | } | ||
104 | |||
105 | 2 | static av_cold int zerocodec_decode_close(AVCodecContext *avctx) | |
106 | { | ||
107 | 2 | ZeroCodecContext *zc = avctx->priv_data; | |
108 | |||
109 | 2 | av_frame_free(&zc->previous_frame); | |
110 | |||
111 | 2 | ff_inflate_end(&zc->zstream); | |
112 | |||
113 | 2 | return 0; | |
114 | } | ||
115 | |||
116 | 2 | static av_cold int zerocodec_decode_init(AVCodecContext *avctx) | |
117 | { | ||
118 | 2 | ZeroCodecContext *zc = avctx->priv_data; | |
119 | |||
120 | 2 | avctx->pix_fmt = AV_PIX_FMT_UYVY422; | |
121 | 2 | avctx->bits_per_raw_sample = 8; | |
122 | |||
123 | 2 | zc->previous_frame = av_frame_alloc(); | |
124 |
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2 | if (!zc->previous_frame) |
125 | ✗ | return AVERROR(ENOMEM); | |
126 | |||
127 | 2 | return ff_inflate_init(&zc->zstream, avctx); | |
128 | } | ||
129 | |||
130 | ✗ | static av_cold void zerocodec_decode_flush(AVCodecContext *avctx) | |
131 | { | ||
132 | ✗ | ZeroCodecContext *zc = avctx->priv_data; | |
133 | |||
134 | ✗ | av_frame_unref(zc->previous_frame); | |
135 | ✗ | } | |
136 | |||
137 | const FFCodec ff_zerocodec_decoder = { | ||
138 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
139 | .p.name = "zerocodec", | ||
140 | CODEC_LONG_NAME("ZeroCodec Lossless Video"), | ||
141 | .p.id = AV_CODEC_ID_ZEROCODEC, | ||
142 | .priv_data_size = sizeof(ZeroCodecContext), | ||
143 | .init = zerocodec_decode_init, | ||
144 | FF_CODEC_DECODE_CB(zerocodec_decode_frame), | ||
145 | .flush = zerocodec_decode_flush, | ||
146 | .close = zerocodec_decode_close, | ||
147 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
148 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
149 | }; | ||
150 |