1 /*
2 * ZeroCodec Decoder
3 *
4 * Copyright (c) 2012, Derek Buitenhuis
5 *
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.
9 *
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.
17 */
18
19 #include <zlib.h>
20
24
29
32 {
36 z_stream *zstream = &zc->
zstream;
39 int i, j, zret, ret;
40
44 } else {
45 if (!prev) {
48 }
49
51
54 }
55
56 zret = inflateReset(zstream);
57 if (zret != Z_OK) {
60 }
61
63 return ret;
64
65 zstream->next_in = avpkt->
data;
66 zstream->avail_in = avpkt->
size;
67
69
70 /**
71 * ZeroCodec has very simple interframe compression. If a value
72 * is the same as the previous frame, set it to 0.
73 */
74
76 zstream->next_out = dst;
77 zstream->avail_out = avctx->
width << 1;
78
79 zret =
inflate(zstream, Z_SYNC_FLUSH);
80 if (zret != Z_OK && zret != Z_STREAM_END) {
82 "Inflate failed with return code: %d.\n", zret);
84 }
85
87 for (j = 0; j < avctx->
width << 1; j++)
88 dst[j] += prev[j] & -!dst[j];
89
92 }
93
96 return ret;
97
98 *got_frame = 1;
99
101 }
102
104 {
106
108
110
111 return 0;
112 }
113
115 {
117 z_stream *zstream = &zc->
zstream;
118 int zret;
119
122
123 zstream->zalloc = Z_NULL;
124 zstream->zfree = Z_NULL;
125 zstream->opaque = Z_NULL;
126
127 zret = inflateInit(zstream);
128 if (zret != Z_OK) {
131 }
132
137 }
138
139 return 0;
140 }
141
144 .name = "zerocodec",
153 };
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
static av_cold int init(AVCodecContext *avctx)
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord)
static int zerocodec_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
int flags
A combination of AV_PKT_FLAG values.
enum AVPictureType pict_type
Picture type of the frame.
int width
picture width / height.
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
main external API structure.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
common internal api header.
common internal and external API header
int key_frame
1 -> keyframe, 0-> not
static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
This structure stores compressed data.
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
AVCodec ff_zerocodec_decoder