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.
22 #include "libavutil/common.h"
25 AVFrame previous_frame;
30 static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
31 int *data_size, AVPacket *avpkt)
33 ZeroCodecContext *zc = avctx->priv_data;
34 AVFrame *pic = avctx->coded_frame;
35 AVFrame *prev_pic = &zc->previous_frame;
36 z_stream *zstream = &zc->zstream;
37 uint8_t *prev = prev_pic->data[0];
43 if (avpkt->flags & AV_PKT_FLAG_KEY) {
45 pic->pict_type = AV_PICTURE_TYPE_I;
48 av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
49 return AVERROR_INVALIDDATA;
52 pic->pict_type = AV_PICTURE_TYPE_P;
55 zret = inflateReset(zstream);
57 av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret);
58 return AVERROR_INVALIDDATA;
61 if (avctx->get_buffer(avctx, pic) < 0) {
62 av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
63 return AVERROR(ENOMEM);
66 zstream->next_in = avpkt->data;
67 zstream->avail_in = avpkt->size;
72 * ZeroCodec has very simple interframe compression. If a value
73 * is the same as the previous frame, set it to 0.
76 for (i = 0; i < avctx->height; i++) {
77 zstream->next_out = dst;
78 zstream->avail_out = avctx->width << 1;
80 zret = inflate(zstream, Z_SYNC_FLUSH);
81 if (zret != Z_OK && zret != Z_STREAM_END) {
82 avctx->release_buffer(avctx, pic);
83 av_log(avctx, AV_LOG_ERROR,
84 "Inflate failed with return code: %d.\n", zret);
85 return AVERROR_INVALIDDATA;
88 if (!(avpkt->flags & AV_PKT_FLAG_KEY))
89 for (j = 0; j < avctx->width << 1; j++)
90 dst[j] += prev[j] & -!dst[j];
92 prev += prev_pic->linesize[0];
93 dst += pic->linesize[0];
96 /* Release the previous buffer if need be */
97 if (prev_pic->data[0])
98 avctx->release_buffer(avctx, prev_pic);
100 *data_size = sizeof(AVFrame);
101 *(AVFrame *)data = *pic;
103 /* Store the previous frame for use later.
104 * FFSWAP ensures that e.g. pic->data is NULLed. */
105 FFSWAP(AVFrame, *pic, *prev_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);
144 av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d.\n", zret);
145 return AVERROR(ENOMEM);
148 avctx->coded_frame = avcodec_alloc_frame();
149 if (!avctx->coded_frame) {
150 av_log(avctx, AV_LOG_ERROR, "Could not allocate frame buffer.\n");
151 zerocodec_decode_close(avctx);
152 return AVERROR(ENOMEM);
158 AVCodec ff_zerocodec_decoder = {
159 .type = AVMEDIA_TYPE_VIDEO,
161 .id = AV_CODEC_ID_ZEROCODEC,
162 .priv_data_size = sizeof(ZeroCodecContext),
163 .init = zerocodec_decode_init,
164 .decode = zerocodec_decode_frame,
165 .close = zerocodec_decode_close,
166 .capabilities = CODEC_CAP_DR1,
167 .long_name = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"),