Libav
zerocodec.c
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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 
21 #include "avcodec.h"
22 #include "internal.h"
23 #include "libavutil/common.h"
24 
25 typedef struct {
27  z_stream zstream;
29 
30 static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
31  int *got_frame, AVPacket *avpkt)
32 {
33  ZeroCodecContext *zc = avctx->priv_data;
34  AVFrame *pic = data;
35  AVFrame *prev_pic = zc->previous_frame;
36  z_stream *zstream = &zc->zstream;
37  uint8_t *prev = prev_pic->data[0];
38  uint8_t *dst;
39  int i, j, zret, ret;
40 
41  if (avpkt->flags & AV_PKT_FLAG_KEY) {
42  pic->key_frame = 1;
44  } else {
45  if (!prev) {
46  av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
47  return AVERROR_INVALIDDATA;
48  }
49 
50  prev += (avctx->height - 1) * prev_pic->linesize[0];
51 
52  pic->key_frame = 0;
54  }
55 
56  zret = inflateReset(zstream);
57  if (zret != Z_OK) {
58  av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret);
59  return AVERROR_INVALIDDATA;
60  }
61 
62  if (ff_get_buffer(avctx, pic, AV_GET_BUFFER_FLAG_REF) < 0) {
63  av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
64  return AVERROR(ENOMEM);
65  }
66 
67  zstream->next_in = avpkt->data;
68  zstream->avail_in = avpkt->size;
69 
70  dst = pic->data[0] + (avctx->height - 1) * pic->linesize[0];
71 
77  for (i = 0; i < avctx->height; i++) {
78  zstream->next_out = dst;
79  zstream->avail_out = avctx->width << 1;
80 
81  zret = inflate(zstream, Z_SYNC_FLUSH);
82  if (zret != Z_OK && zret != Z_STREAM_END) {
83  av_log(avctx, AV_LOG_ERROR,
84  "Inflate failed with return code: %d.\n", zret);
85  return AVERROR_INVALIDDATA;
86  }
87 
88  if (!(avpkt->flags & AV_PKT_FLAG_KEY))
89  for (j = 0; j < avctx->width << 1; j++)
90  dst[j] += prev[j] & -!dst[j];
91 
92  prev -= prev_pic->linesize[0];
93  dst -= pic->linesize[0];
94  }
95 
97  if ((ret = av_frame_ref(zc->previous_frame, pic)) < 0)
98  return ret;
99 
100  *got_frame = 1;
101 
102  return avpkt->size;
103 }
104 
106 {
107  ZeroCodecContext *zc = avctx->priv_data;
108 
110 
111  inflateEnd(&zc->zstream);
112 
113  return 0;
114 }
115 
117 {
118  ZeroCodecContext *zc = avctx->priv_data;
119  z_stream *zstream = &zc->zstream;
120  int zret;
121 
122  avctx->pix_fmt = AV_PIX_FMT_UYVY422;
123  avctx->bits_per_raw_sample = 8;
124 
125  zstream->zalloc = Z_NULL;
126  zstream->zfree = Z_NULL;
127  zstream->opaque = Z_NULL;
128 
129  zret = inflateInit(zstream);
130  if (zret != Z_OK) {
131  av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d.\n", zret);
132  return AVERROR(ENOMEM);
133  }
134 
136  if (!zc->previous_frame) {
137  zerocodec_decode_close(avctx);
138  return AVERROR(ENOMEM);
139  }
140 
141  return 0;
142 }
143 
146  .name = "zerocodec",
147  .long_name = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"),
148  .id = AV_CODEC_ID_ZEROCODEC,
149  .priv_data_size = sizeof(ZeroCodecContext),
153  .capabilities = CODEC_CAP_DR1,
154 };
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
Definition: pixfmt.h:84
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int size
Definition: avcodec.h:968
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1248
z_stream zstream
Definition: zerocodec.c:27
enum AVMediaType type
Definition: avcodec.h:2803
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2508
AVCodec.
Definition: avcodec.h:2790
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
uint8_t
#define av_cold
Definition: attributes.h:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:57
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:188
static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
Definition: zerocodec.c:105
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:967
static int zerocodec_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: zerocodec.c:30
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1013
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:69
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:973
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:196
int width
picture width / height.
Definition: avcodec.h:1218
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
main external API structure.
Definition: avcodec.h:1044
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:603
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:283
AVFrame * previous_frame
Definition: zerocodec.c:26
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
common internal api header.
common internal and external API header
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1086
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:191
static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
Definition: zerocodec.c:116
This structure stores compressed data.
Definition: avcodec.h:944
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:850
for(j=16;j >0;--j)
AVCodec ff_zerocodec_decoder
Definition: zerocodec.c:144
Predicted.
Definition: avutil.h:254