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.
23 #include "libavutil/common.h"
26 AVFrame previous_frame;
30 static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
31 int *got_frame, 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 prev += (avctx->height - 1) * prev_pic->linesize[0];
55 pic->pict_type = AV_PICTURE_TYPE_P;
58 zret = inflateReset(zstream);
60 av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret);
61 return AVERROR_INVALIDDATA;
64 if (ff_get_buffer(avctx, pic) < 0) {
65 av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
66 return AVERROR(ENOMEM);
69 zstream->next_in = avpkt->data;
70 zstream->avail_in = avpkt->size;
72 dst = pic->data[0] + (avctx->height - 1) * pic->linesize[0];
75 * ZeroCodec has very simple interframe compression. If a value
76 * is the same as the previous frame, set it to 0.
79 for (i = 0; i < avctx->height; i++) {
80 zstream->next_out = dst;
81 zstream->avail_out = avctx->width << 1;
83 zret = inflate(zstream, Z_SYNC_FLUSH);
84 if (zret != Z_OK && zret != Z_STREAM_END) {
85 avctx->release_buffer(avctx, pic);
86 av_log(avctx, AV_LOG_ERROR,
87 "Inflate failed with return code: %d.\n", zret);
88 return AVERROR_INVALIDDATA;
91 if (!(avpkt->flags & AV_PKT_FLAG_KEY))
92 for (j = 0; j < avctx->width << 1; j++)
93 dst[j] += prev[j] & -!dst[j];
95 prev -= prev_pic->linesize[0];
96 dst -= pic->linesize[0];
99 /* Release the previous buffer if need be */
100 if (prev_pic->data[0])
101 avctx->release_buffer(avctx, prev_pic);
104 *(AVFrame *)data = *pic;
106 /* Store the previous frame for use later.
107 * FFSWAP ensures that e.g. pic->data is NULLed. */
108 FFSWAP(AVFrame, *pic, *prev_pic);
113 static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
115 ZeroCodecContext *zc = avctx->priv_data;
116 AVFrame *prev_pic = &zc->previous_frame;
118 inflateEnd(&zc->zstream);
120 /* Release last frame */
121 if (prev_pic->data[0])
122 avctx->release_buffer(avctx, prev_pic);
124 av_freep(&avctx->coded_frame);
129 static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
131 ZeroCodecContext *zc = avctx->priv_data;
132 z_stream *zstream = &zc->zstream;
135 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
136 avctx->bits_per_raw_sample = 8;
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"),