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2ba45a60 DM |
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 { | |
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 = CODEC_CAP_DR1, | |
152 | }; |