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6cabb67 @dwbuiten ZeroCodec Decoder
dwbuiten authored
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>
0e714f8 @dwbuiten ZeroCodec Decoder
dwbuiten authored
20
6cabb67 @dwbuiten ZeroCodec Decoder
dwbuiten authored
21 #include "avcodec.h"
22
23 typedef struct {
24 AVFrame previous_frame;
25 z_stream zstream;
26 int size;
27 } ZeroCodecContext;
28
29 static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
30 int *data_size, AVPacket *avpkt)
31 {
32 ZeroCodecContext *zc = avctx->priv_data;
33 AVFrame *pic = avctx->coded_frame;
34 AVFrame *prev_pic = &zc->previous_frame;
35 z_stream *zstream = &zc->zstream;
313d198 zerocodec: fix direct rendering.
Reimar Döffinger authored
36 uint8_t *prev = prev_pic->data[0], *dst;
6cabb67 @dwbuiten ZeroCodec Decoder
dwbuiten authored
37 int i, j, zret;
38
39 pic->reference = 3;
40
313d198 zerocodec: fix direct rendering.
Reimar Döffinger authored
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 pic->key_frame = 0;
50 pic->pict_type = AV_PICTURE_TYPE_P;
51 }
52
6cabb67 @dwbuiten ZeroCodec Decoder
dwbuiten authored
53 if (avctx->get_buffer(avctx, pic) < 0) {
54 av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
55 return AVERROR(ENOMEM);
56 }
57
58 zret = inflateReset(zstream);
59
60 if (zret != Z_OK) {
61 av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d\n", zret);
62 return AVERROR(EINVAL);
63 }
64
65 zstream->next_in = avpkt->data;
66 zstream->avail_in = avpkt->size;
67
68 dst = pic->data[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
9e69d3c @michaelni zerocodec: factorize loop
michaelni authored
75 for (i = 0; i < avctx->height; i++) {
76 zstream->next_out = dst;
77 zstream->avail_out = avctx->width << 1;
78 zret = inflate(zstream, Z_SYNC_FLUSH);
79 if (zret != Z_OK && zret != Z_STREAM_END) {
80 av_log(avctx, AV_LOG_ERROR,
afa6129 @michaelni zerocodec: factorize loop
michaelni authored
81 "Inflate failed with return code: %d\n", zret);
9e69d3c @michaelni zerocodec: factorize loop
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82 return AVERROR(EINVAL);
83 }
6cabb67 @dwbuiten ZeroCodec Decoder
dwbuiten authored
84
9e69d3c @michaelni zerocodec: factorize loop
michaelni authored
85 if (!(avpkt->flags & AV_PKT_FLAG_KEY))
6cabb67 @dwbuiten ZeroCodec Decoder
dwbuiten authored
86 for (j = 0; j < avctx->width << 1; j++)
87 dst[j] += prev[j] & -!dst[j];
88
9e69d3c @michaelni zerocodec: factorize loop
michaelni authored
89 prev += prev_pic->linesize[0];
90 dst += pic->linesize[0];
6cabb67 @dwbuiten ZeroCodec Decoder
dwbuiten authored
91 }
92
93 /* Release the previous buffer if need be */
94 if (prev_pic->data[0])
95 avctx->release_buffer(avctx, prev_pic);
96
0e714f8 @dwbuiten ZeroCodec Decoder
dwbuiten authored
97 *data_size = sizeof(AVFrame);
6cabb67 @dwbuiten ZeroCodec Decoder
dwbuiten authored
98 *(AVFrame *)data = *pic;
99
313d198 zerocodec: fix direct rendering.
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100 /* Store the previous frame for use later.
101 * FFSWAP ensures that e.g. pic->data is NULLed. */
102 FFSWAP(AVFrame, *pic, *prev_pic);
103
6cabb67 @dwbuiten ZeroCodec Decoder
dwbuiten authored
104 return avpkt->size;
105 }
106
107 static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
108 {
109 ZeroCodecContext *zc = avctx->priv_data;
110 AVFrame *prev_pic = &zc->previous_frame;
111
112 inflateEnd(&zc->zstream);
113
114 /* Release last frame */
115 if (prev_pic->data[0])
116 avctx->release_buffer(avctx, prev_pic);
117
118 av_freep(&avctx->coded_frame);
119
120 return 0;
121 }
122
123 static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
124 {
125 ZeroCodecContext *zc = avctx->priv_data;
126 z_stream *zstream = &zc->zstream;
127 int zret;
128
129 avctx->pix_fmt = PIX_FMT_UYVY422;
130 avctx->bits_per_raw_sample = 8;
131
132 zc->size = avpicture_get_size(avctx->pix_fmt,
133 avctx->width, avctx->height);
134
135 zstream->zalloc = Z_NULL;
136 zstream->zfree = Z_NULL;
137 zstream->opaque = Z_NULL;
138
139 zret = inflateInit(zstream);
140
141 if (zret != Z_OK) {
142 av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d\n", zret);
143 return AVERROR(ENOMEM);
144 }
145
146 avctx->coded_frame = avcodec_alloc_frame();
147
148 if (!avctx->coded_frame) {
149 av_log(avctx, AV_LOG_ERROR, "Could not allocate frame buffer.\n");
150 zerocodec_decode_close(avctx);
151 return AVERROR(ENOMEM);
152 }
153
154 return 0;
155 }
156
157 AVCodec ff_zerocodec_decoder = {
158 .type = AVMEDIA_TYPE_VIDEO,
159 .name = "zerocodec",
160 .id = CODEC_ID_ZEROCODEC,
161 .priv_data_size = sizeof(ZeroCodecContext),
162 .init = zerocodec_decode_init,
163 .decode = zerocodec_decode_frame,
164 .close = zerocodec_decode_close,
165 .capabilities = CODEC_CAP_DR1,
166 .long_name = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"),
167 };
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