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) {
67 pic->pict_type = AV_PICTURE_TYPE_I;
72 pic->pict_type = AV_PICTURE_TYPE_P;
76 for (i = 0; i < avctx->height; i++) {
78 zstream->next_out = dst;
79 zstream->avail_out = avctx->width << 1;
81 zret = inflate(zstream, Z_SYNC_FLUSH);
83 if (zret != Z_OK && zret != Z_STREAM_END) {
84 av_log(avctx, AV_LOG_ERROR,
85 "Inflate failed with return code: %d\n", zret);
86 return AVERROR(EINVAL);
89 if (!(avpkt->flags & AV_PKT_FLAG_KEY))
90 for (j = 0; j < avctx->width << 1; j++)
91 dst[j] += prev[j] & -!dst[j];
93 prev += prev_pic->linesize[0];
94 dst += pic->linesize[0];
97 /* Release the previous buffer if need be */
98 if (prev_pic->data[0])
99 avctx->release_buffer(avctx, prev_pic);
101 /* Store the previouse frame for use later */
104 *data_size = sizeof(AVFrame);
105 *(AVFrame *)data = *pic;
110 static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
112 ZeroCodecContext *zc = avctx->priv_data;
113 AVFrame *prev_pic = &zc->previous_frame;
115 inflateEnd(&zc->zstream);
117 /* Release last frame */
118 if (prev_pic->data[0])
119 avctx->release_buffer(avctx, prev_pic);
121 av_freep(&avctx->coded_frame);
126 static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
128 ZeroCodecContext *zc = avctx->priv_data;
129 z_stream *zstream = &zc->zstream;
132 avctx->pix_fmt = PIX_FMT_UYVY422;
133 avctx->bits_per_raw_sample = 8;
135 zc->size = avpicture_get_size(avctx->pix_fmt,
136 avctx->width, avctx->height);
138 zstream->zalloc = Z_NULL;
139 zstream->zfree = Z_NULL;
140 zstream->opaque = Z_NULL;
142 zret = inflateInit(zstream);
145 av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d\n", zret);
146 return AVERROR(ENOMEM);
149 avctx->coded_frame = avcodec_alloc_frame();
151 if (!avctx->coded_frame) {
152 av_log(avctx, AV_LOG_ERROR, "Could not allocate frame buffer.\n");
153 zerocodec_decode_close(avctx);
154 return AVERROR(ENOMEM);
160 AVCodec ff_zerocodec_decoder = {
161 .type = AVMEDIA_TYPE_VIDEO,
163 .id = CODEC_ID_ZEROCODEC,
164 .priv_data_size = sizeof(ZeroCodecContext),
165 .init = zerocodec_decode_init,
166 .decode = zerocodec_decode_frame,
167 .close = zerocodec_decode_close,
168 .capabilities = CODEC_CAP_DR1,
169 .long_name = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"),