FFmpeg  4.3
wnv1.c
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1 /*
2  * Winnov WNV1 codec
3  * Copyright (c) 2005 Konstantin Shishkov
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  * Winnov WNV1 codec.
25  */
26 
27 #include "avcodec.h"
28 #include "get_bits.h"
29 #include "internal.h"
30 #include "mathops.h"
31 
32 
33 typedef struct WNV1Context {
34  int shift;
36 } WNV1Context;
37 
38 static const uint16_t code_tab[16][2] = {
39  { 0x1FD, 9 }, { 0xFD, 8 }, { 0x7D, 7 }, { 0x3D, 6 }, { 0x1D, 5 }, { 0x0D, 4 }, { 0x005, 3 },
40  { 0x000, 1 },
41  { 0x004, 3 }, { 0x0C, 4 }, { 0x1C, 5 }, { 0x3C, 6 }, { 0x7C, 7 }, { 0xFC, 8 }, { 0x1FC, 9 }, { 0xFF, 8 }
42 };
43 
44 #define CODE_VLC_BITS 9
45 static VLC code_vlc;
46 
47 /* returns modified base_value */
48 static inline int wnv1_get_code(WNV1Context *w, int base_value)
49 {
50  int v = get_vlc2(&w->gb, code_vlc.table, CODE_VLC_BITS, 1);
51 
52  if (v == 15)
53  return ff_reverse[get_bits(&w->gb, 8 - w->shift)];
54  else
55  return base_value + ((v - 7U) << w->shift);
56 }
57 
58 static int decode_frame(AVCodecContext *avctx,
59  void *data, int *got_frame,
60  AVPacket *avpkt)
61 {
62  WNV1Context * const l = avctx->priv_data;
63  const uint8_t *buf = avpkt->data;
64  int buf_size = avpkt->size;
65  AVFrame * const p = data;
66  unsigned char *Y,*U,*V;
67  int i, j, ret;
68  int prev_y = 0, prev_u = 0, prev_v = 0;
69  uint8_t *rbuf;
70 
71  if (buf_size < 8 + avctx->height * (avctx->width/2)/8) {
72  av_log(avctx, AV_LOG_ERROR, "Packet size %d is too small\n", buf_size);
73  return AVERROR_INVALIDDATA;
74  }
75 
76  rbuf = av_malloc(buf_size + AV_INPUT_BUFFER_PADDING_SIZE);
77  if (!rbuf) {
78  av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
79  return AVERROR(ENOMEM);
80  }
81  memset(rbuf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
82 
83  if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
84  av_free(rbuf);
85  return ret;
86  }
87  p->key_frame = 1;
88 
89  for (i = 8; i < buf_size; i++)
90  rbuf[i] = ff_reverse[buf[i]];
91 
92  if ((ret = init_get_bits8(&l->gb, rbuf + 8, buf_size - 8)) < 0)
93  return ret;
94 
95  if (buf[2] >> 4 == 6)
96  l->shift = 2;
97  else {
98  l->shift = 8 - (buf[2] >> 4);
99  if (l->shift > 4) {
100  avpriv_request_sample(avctx,
101  "Unknown WNV1 frame header value %i",
102  buf[2] >> 4);
103  l->shift = 4;
104  }
105  if (l->shift < 1) {
106  avpriv_request_sample(avctx,
107  "Unknown WNV1 frame header value %i",
108  buf[2] >> 4);
109  l->shift = 1;
110  }
111  }
112 
113  Y = p->data[0];
114  U = p->data[1];
115  V = p->data[2];
116  for (j = 0; j < avctx->height; j++) {
117  for (i = 0; i < avctx->width / 2; i++) {
118  Y[i * 2] = wnv1_get_code(l, prev_y);
119  prev_u = U[i] = wnv1_get_code(l, prev_u);
120  prev_y = Y[(i * 2) + 1] = wnv1_get_code(l, Y[i * 2]);
121  prev_v = V[i] = wnv1_get_code(l, prev_v);
122  }
123  Y += p->linesize[0];
124  U += p->linesize[1];
125  V += p->linesize[2];
126  }
127 
128 
129  *got_frame = 1;
130  av_free(rbuf);
131 
132  return buf_size;
133 }
134 
136 {
137  static VLC_TYPE code_table[1 << CODE_VLC_BITS][2];
138 
139  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
140 
141  code_vlc.table = code_table;
144  &code_tab[0][1], 4, 2,
145  &code_tab[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
146 
147  return 0;
148 }
149 
151  .name = "wnv1",
152  .long_name = NULL_IF_CONFIG_SMALL("Winnov WNV1"),
153  .type = AVMEDIA_TYPE_VIDEO,
154  .id = AV_CODEC_ID_WNV1,
155  .priv_data_size = sizeof(WNV1Context),
156  .init = decode_init,
157  .decode = decode_frame,
158  .capabilities = AV_CODEC_CAP_DR1,
159 };
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
code_vlc
static VLC code_vlc
Definition: wnv1.c:45
WNV1Context::gb
GetBitContext gb
Definition: wnv1.c:35
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
AV_CODEC_ID_WNV1
@ AV_CODEC_ID_WNV1
Definition: codec_id.h:122
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:355
init_vlc
#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
Definition: vlc.h:38
ff_reverse
const uint8_t ff_reverse[256]
Definition: reverse.c:23
data
const char data[16]
Definition: mxf.c:91
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:797
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
CODE_VLC_BITS
#define CODE_VLC_BITS
Definition: wnv1.c:44
wnv1_get_code
static int wnv1_get_code(WNV1Context *w, int base_value)
Definition: wnv1.c:48
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
VLC_TYPE
#define VLC_TYPE
Definition: vlc.h:24
U
#define U(x)
Definition: vp56_arith.h:37
GetBitContext
Definition: get_bits.h:61
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:378
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: wnv1.c:135
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
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
get_bits.h
ff_wnv1_decoder
AVCodec ff_wnv1_decoder
Definition: wnv1.c:150
code_tab
static const uint16_t code_tab[16][2]
Definition: wnv1.c:38
V
#define V
Definition: avdct.c:30
mathops.h
INIT_VLC_USE_NEW_STATIC
#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:55
VLC::table_allocated
int table_allocated
Definition: vlc.h:29
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
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
decode_frame
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: wnv1.c:58
height
#define height
WNV1Context
Definition: wnv1.c:33
Y
#define Y
Definition: boxblur.h:38
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
WNV1Context::shift
int shift
Definition: wnv1.c:34
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
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
w
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 ug o o w
Definition: fate.txt:150
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: avcodec.h:215
AVCodecContext
main external API structure.
Definition: avcodec.h:526
VLC
Definition: vlc.h:26
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_PIX_FMT_YUV422P
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:553
AVPacket
This structure stores compressed data.
Definition: packet.h:332
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_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
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28