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;
36 uint8_t *prev = prev_pic->data[0], *dst;
41 if (avpkt->flags & AV_PKT_FLAG_KEY) {
43 pic->pict_type = AV_PICTURE_TYPE_I;
46 av_log(avctx, AV_LOG_ERROR, "Missing reference frame!\n");
47 return AVERROR_INVALIDDATA;
50 pic->pict_type = AV_PICTURE_TYPE_P;
53 if (avctx->get_buffer(avctx, pic) < 0) {
54 av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
55 return AVERROR(ENOMEM);
58 zret = inflateReset(zstream);
61 av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d\n", zret);
62 return AVERROR(EINVAL);
65 zstream->next_in = avpkt->data;
66 zstream->avail_in = avpkt->size;
71 * ZeroCodec has very simple interframe compression. If a value
72 * is the same as the previous frame, set it to 0.
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,
81 "Inflate failed with return code: %d\n", zret);
82 return AVERROR(EINVAL);
85 if (!(avpkt->flags & AV_PKT_FLAG_KEY))
86 for (j = 0; j < avctx->width << 1; j++)
87 dst[j] += prev[j] & -!dst[j];
89 prev += prev_pic->linesize[0];
90 dst += pic->linesize[0];
93 /* Release the previous buffer if need be */
94 if (prev_pic->data[0])
95 avctx->release_buffer(avctx, prev_pic);
97 *data_size = sizeof(AVFrame);
98 *(AVFrame *)data = *pic;
100 /* Store the previous frame for use later.
101 * FFSWAP ensures that e.g. pic->data is NULLed. */
102 FFSWAP(AVFrame, *pic, *prev_pic);
107 static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
109 ZeroCodecContext *zc = avctx->priv_data;
110 AVFrame *prev_pic = &zc->previous_frame;
112 inflateEnd(&zc->zstream);
114 /* Release last frame */
115 if (prev_pic->data[0])
116 avctx->release_buffer(avctx, prev_pic);
118 av_freep(&avctx->coded_frame);
123 static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
125 ZeroCodecContext *zc = avctx->priv_data;
126 z_stream *zstream = &zc->zstream;
129 avctx->pix_fmt = PIX_FMT_UYVY422;
130 avctx->bits_per_raw_sample = 8;
132 zc->size = avpicture_get_size(avctx->pix_fmt,
133 avctx->width, avctx->height);
135 zstream->zalloc = Z_NULL;
136 zstream->zfree = Z_NULL;
137 zstream->opaque = Z_NULL;
139 zret = inflateInit(zstream);
142 av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d\n", zret);
143 return AVERROR(ENOMEM);
146 avctx->coded_frame = avcodec_alloc_frame();
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);
157 AVCodec ff_zerocodec_decoder = {
158 .type = AVMEDIA_TYPE_VIDEO,
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"),