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];
42 if (avpkt->flags & AV_PKT_FLAG_KEY) {
44 pic->pict_type = AV_PICTURE_TYPE_I;
47 av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
48 return AVERROR_INVALIDDATA;
51 pic->pict_type = AV_PICTURE_TYPE_P;
54 zret = inflateReset(zstream);
56 av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret);
57 return AVERROR_INVALIDDATA;
60 if (avctx->get_buffer(avctx, pic) < 0) {
61 av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
62 return AVERROR(ENOMEM);
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;
79 zret = inflate(zstream, Z_SYNC_FLUSH);
80 if (zret != Z_OK && zret != Z_STREAM_END) {
81 avctx->release_buffer(avctx, pic);
82 av_log(avctx, AV_LOG_ERROR,
83 "Inflate failed with return code: %d.\n", zret);
84 return AVERROR_INVALIDDATA;
87 if (!(avpkt->flags & AV_PKT_FLAG_KEY))
88 for (j = 0; j < avctx->width << 1; j++)
89 dst[j] += prev[j] & -!dst[j];
91 prev += prev_pic->linesize[0];
92 dst += pic->linesize[0];
95 /* Release the previous buffer if need be */
96 if (prev_pic->data[0])
97 avctx->release_buffer(avctx, prev_pic);
99 *data_size = sizeof(AVFrame);
100 *(AVFrame *)data = *pic;
102 /* Store the previous frame for use later.
103 * FFSWAP ensures that e.g. pic->data is NULLed. */
104 FFSWAP(AVFrame, *pic, *prev_pic);
109 static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
111 ZeroCodecContext *zc = avctx->priv_data;
112 AVFrame *prev_pic = &zc->previous_frame;
114 inflateEnd(&zc->zstream);
116 /* Release last frame */
117 if (prev_pic->data[0])
118 avctx->release_buffer(avctx, prev_pic);
120 av_freep(&avctx->coded_frame);
125 static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
127 ZeroCodecContext *zc = avctx->priv_data;
128 z_stream *zstream = &zc->zstream;
131 avctx->pix_fmt = PIX_FMT_UYVY422;
132 avctx->bits_per_raw_sample = 8;
134 zc->size = avpicture_get_size(avctx->pix_fmt,
135 avctx->width, avctx->height);
137 zstream->zalloc = Z_NULL;
138 zstream->zfree = Z_NULL;
139 zstream->opaque = Z_NULL;
141 zret = inflateInit(zstream);
143 av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d.\n", zret);
144 return AVERROR(ENOMEM);
147 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"),