4 * Copyright (c) 2012, Derek Buitenhuis
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.
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.
24 AVFrame previous_frame;
29 static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
30 int *data_size, AVPacket *avpkt)
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;
41 if (avctx->get_buffer(avctx, pic) < 0) {
42 av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
43 return AVERROR(ENOMEM);
46 zret = inflateReset(zstream);
49 av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d\n", zret);
50 return AVERROR(EINVAL);
53 zstream->next_in = avpkt->data;
54 zstream->avail_in = avpkt->size;
56 prev = prev_pic->data[0];
60 * ZeroCodec has very simple interframe compression. If a value
61 * is the same as the previous frame, set it to 0.
64 if (avpkt->flags & AV_PKT_FLAG_KEY) {
66 pic->pict_type = AV_PICTURE_TYPE_I;
69 pic->pict_type = AV_PICTURE_TYPE_P;
72 for (i = 0; i < avctx->height; i++) {
73 zstream->next_out = dst;
74 zstream->avail_out = avctx->width << 1;
75 zret = inflate(zstream, Z_SYNC_FLUSH);
76 if (zret != Z_OK && zret != Z_STREAM_END) {
77 av_log(avctx, AV_LOG_ERROR,
78 "Inflate failed with return code: %d\n", zret);
79 return AVERROR(EINVAL);
82 if (!(avpkt->flags & AV_PKT_FLAG_KEY))
83 for (j = 0; j < avctx->width << 1; j++)
84 dst[j] += prev[j] & -!dst[j];
86 prev += prev_pic->linesize[0];
87 dst += pic->linesize[0];
90 /* Release the previous buffer if need be */
91 if (prev_pic->data[0])
92 avctx->release_buffer(avctx, prev_pic);
94 /* Store the previouse frame for use later */
97 *data_size = sizeof(AVFrame);
98 *(AVFrame *)data = *pic;
103 static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
105 ZeroCodecContext *zc = avctx->priv_data;
106 AVFrame *prev_pic = &zc->previous_frame;
108 inflateEnd(&zc->zstream);
110 /* Release last frame */
111 if (prev_pic->data[0])
112 avctx->release_buffer(avctx, prev_pic);
114 av_freep(&avctx->coded_frame);
119 static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
121 ZeroCodecContext *zc = avctx->priv_data;
122 z_stream *zstream = &zc->zstream;
125 avctx->pix_fmt = PIX_FMT_UYVY422;
126 avctx->bits_per_raw_sample = 8;
128 zc->size = avpicture_get_size(avctx->pix_fmt,
129 avctx->width, avctx->height);
131 zstream->zalloc = Z_NULL;
132 zstream->zfree = Z_NULL;
133 zstream->opaque = Z_NULL;
135 zret = inflateInit(zstream);
138 av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d\n", zret);
139 return AVERROR(ENOMEM);
142 avctx->coded_frame = avcodec_alloc_frame();
144 if (!avctx->coded_frame) {
145 av_log(avctx, AV_LOG_ERROR, "Could not allocate frame buffer.\n");
146 zerocodec_decode_close(avctx);
147 return AVERROR(ENOMEM);
153 AVCodec ff_zerocodec_decoder = {
154 .type = AVMEDIA_TYPE_VIDEO,
156 .id = CODEC_ID_ZEROCODEC,
157 .priv_data_size = sizeof(ZeroCodecContext),
158 .init = zerocodec_decode_init,
159 .decode = zerocodec_decode_frame,
160 .close = zerocodec_decode_close,
161 .capabilities = CODEC_CAP_DR1,
162 .long_name = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"),