FFmpeg  4.3
vcr1.c
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1 /*
2  * ATI VCR1 codec
3  * Copyright (c) 2003 Michael Niedermayer
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * ATI VCR1 codec
25  */
26 
27 #include "avcodec.h"
28 #include "internal.h"
29 #include "libavutil/avassert.h"
30 #include "libavutil/internal.h"
31 
32 typedef struct VCR1Context {
33  int delta[16];
34  int offset[4];
35 } VCR1Context;
36 
38 {
39  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
40 
41  if (avctx->width % 8 || avctx->height%4) {
42  avpriv_request_sample(avctx, "odd dimensions (%d x %d) support", avctx->width, avctx->height);
43  return AVERROR_INVALIDDATA;
44  }
45 
46  return 0;
47 }
48 
49 static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
50  int *got_frame, AVPacket *avpkt)
51 {
52  VCR1Context *const a = avctx->priv_data;
53  AVFrame *const p = data;
54  const uint8_t *bytestream = avpkt->data;
55  const uint8_t *bytestream_end = bytestream + avpkt->size;
56  int i, x, y, ret;
57 
58  if(avpkt->size < 32 + avctx->height + avctx->width*avctx->height*5/8){
59  av_log(avctx, AV_LOG_ERROR, "Insufficient input data. %d < %d\n", avpkt->size , 32 + avctx->height + avctx->width*avctx->height*5/8);
60  return AVERROR(EINVAL);
61  }
62 
63  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
64  return ret;
66  p->key_frame = 1;
67 
68  for (i = 0; i < 16; i++) {
69  a->delta[i] = *bytestream++;
70  bytestream++;
71  }
72 
73  for (y = 0; y < avctx->height; y++) {
74  int offset;
75  uint8_t *luma = &p->data[0][y * p->linesize[0]];
76 
77  if ((y & 3) == 0) {
78  uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]];
79  uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]];
80 
81  av_assert0 (bytestream_end - bytestream >= 4 + avctx->width);
82 
83  for (i = 0; i < 4; i++)
84  a->offset[i] = *bytestream++;
85 
86  offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
87  for (x = 0; x < avctx->width; x += 4) {
88  luma[0] = offset += a->delta[bytestream[2] & 0xF];
89  luma[1] = offset += a->delta[bytestream[2] >> 4];
90  luma[2] = offset += a->delta[bytestream[0] & 0xF];
91  luma[3] = offset += a->delta[bytestream[0] >> 4];
92  luma += 4;
93 
94  *cb++ = bytestream[3];
95  *cr++ = bytestream[1];
96 
97  bytestream += 4;
98  }
99  } else {
100  av_assert0 (bytestream_end - bytestream >= avctx->width / 2);
101 
102  offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];
103 
104  for (x = 0; x < avctx->width; x += 8) {
105  luma[0] = offset += a->delta[bytestream[2] & 0xF];
106  luma[1] = offset += a->delta[bytestream[2] >> 4];
107  luma[2] = offset += a->delta[bytestream[3] & 0xF];
108  luma[3] = offset += a->delta[bytestream[3] >> 4];
109  luma[4] = offset += a->delta[bytestream[0] & 0xF];
110  luma[5] = offset += a->delta[bytestream[0] >> 4];
111  luma[6] = offset += a->delta[bytestream[1] & 0xF];
112  luma[7] = offset += a->delta[bytestream[1] >> 4];
113  luma += 8;
114  bytestream += 4;
115  }
116  }
117  }
118 
119  *got_frame = 1;
120 
121  return bytestream - avpkt->data;
122 }
123 
125  .name = "vcr1",
126  .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
127  .type = AVMEDIA_TYPE_VIDEO,
128  .id = AV_CODEC_ID_VCR1,
129  .priv_data_size = sizeof(VCR1Context),
132  .capabilities = AV_CODEC_CAP_DR1,
133 };
AVCodec
AVCodec.
Definition: codec.h:190
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
cb
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:215
ff_vcr1_decoder
AVCodec ff_vcr1_decoder
Definition: vcr1.c:124
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:355
data
const char data[16]
Definition: mxf.c:91
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
x
FFmpeg Automated Testing Environment ************************************Introduction Using FATE from your FFmpeg source directory Submitting the results to the FFmpeg result aggregation server Uploading new samples to the fate suite FATE makefile targets and variables Makefile targets Makefile variables Examples Introduction **************FATE is an extended regression suite on the client side and a means for results aggregation and presentation on the server side The first part of this document explains how you can use FATE from your FFmpeg source directory to test your ffmpeg binary The second part describes how you can run FATE to submit the results to FFmpeg’s FATE server In any way you can have a look at the publicly viewable FATE results by visiting this as it can be seen if some test on some platform broke with their recent contribution This usually happens on the platforms the developers could not test on The second part of this document describes how you can run FATE to submit your results to FFmpeg’s FATE server If you want to submit your results be sure to check that your combination of OS and compiler is not already listed on the above mentioned website In the third part you can find a comprehensive listing of FATE makefile targets and variables Using FATE from your FFmpeg source directory **********************************************If you want to run FATE on your machine you need to have the samples in place You can get the samples via the build target fate rsync Use this command from the top level source this will cause FATE to fail NOTE To use a custom wrapper to run the pass ‘ target exec’ to ‘configure’ or set the TARGET_EXEC Make variable Submitting the results to the FFmpeg result aggregation server ****************************************************************To submit your results to the server you should run fate through the shell script ‘tests fate sh’ from the FFmpeg sources This script needs to be invoked with a configuration file as its first argument tests fate sh path to fate_config A configuration file template with comments describing the individual configuration variables can be found at ‘doc fate_config sh template’ Create a configuration that suits your based on the configuration template The ‘slot’ configuration variable can be any string that is not yet but it is suggested that you name it adhering to the following pattern ‘ARCH OS COMPILER COMPILER VERSION’ The configuration file itself will be sourced in a shell therefore all shell features may be used This enables you to setup the environment as you need it for your build For your first test runs the ‘fate_recv’ variable should be empty or commented out This will run everything as normal except that it will omit the submission of the results to the server The following files should be present in $workdir as specified in the configuration it may help to try out the ‘ssh’ command with one or more ‘ v’ options You should get detailed output concerning your SSH configuration and the authentication process The only thing left is to automate the execution of the fate sh script and the synchronisation of the samples directory Uploading new samples to the fate suite *****************************************If you need a sample uploaded send a mail to samples request This is for developers who have an account on the fate suite server If you upload new please make sure they are as small as space on each network bandwidth and so on benefit from smaller test cases Also keep in mind older checkouts use existing sample that means in practice generally do not remove or overwrite files as it likely would break older checkouts or releases Also all needed samples for a commit should be ideally before the push If you need an account for frequently uploading samples or you wish to help others by doing that send a mail to ffmpeg devel rsync vauL Duo x
Definition: fate.txt:150
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:378
VCR1Context
Definition: vcr1.c:32
avassert.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
av_cold
#define av_cold
Definition: attributes.h:90
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
AV_CODEC_ID_VCR1
@ AV_CODEC_ID_VCR1
Definition: codec_id.h:84
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:383
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1854
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
AVPacket::size
int size
Definition: packet.h:356
vcr1_decode_frame
static int vcr1_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: vcr1.c:49
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:186
VCR1Context::offset
int offset[4]
Definition: vcr1.c:34
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
VCR1Context::delta
int delta[16]
Definition: vcr1.c:33
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
internal.h
uint8_t
uint8_t
Definition: audio_convert.c:194
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:197
AVCodecContext::height
int height
Definition: avcodec.h:699
vcr1_decode_init
static av_cold int vcr1_decode_init(AVCodecContext *avctx)
Definition: vcr1.c:37
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:526
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:553
AVPacket
This structure stores compressed data.
Definition: packet.h:332
cr
static double cr(void *priv, double x, double y)
Definition: vf_geq.c:216
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:699
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
AV_PIX_FMT_YUV410P
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59