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m101.c
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1 /*
2  * Copyright (c) 2016 Michael Niedermayer
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/intreadwrite.h"
22 
23 #include "avcodec.h"
24 #include "internal.h"
25 
26 
28 {
29  if (avctx->extradata_size < 6*4) {
30  avpriv_request_sample(avctx, "Missing or too small extradata (size %d)", avctx->extradata_size);
31  return AVERROR_INVALIDDATA;
32  }
33 
34  if (avctx->extradata[2*4] == 10)
36  else if (avctx->extradata[2*4] == 8) {
37  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
38  } else {
39  avpriv_request_sample(avctx, "BPS %d", avctx->extradata[2*4]);
40  return AVERROR_INVALIDDATA;
41  }
42 
43  return 0;
44 }
45 
46 static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
47  AVPacket *avpkt)
48 {
49  const uint8_t *buf = avpkt->data;
50  int stride, ret;
51  int x, y;
52  int min_stride = 2 * avctx->width;
53  int bits = avctx->extradata[2*4];
54  AVFrame *frame = data;
55 
56  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
57  return ret;
59  frame->key_frame = 1;
60 
61  stride = AV_RL32(avctx->extradata + 5*4);
62 
63  if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
64  min_stride = (avctx->width + 15) / 16 * 20;
65 
66  if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) {
67  av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n",
68  stride, avpkt->size);
69  return AVERROR_INVALIDDATA;
70  }
71 
72  frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3);
73  if (frame->interlaced_frame)
74  frame->top_field_first = avctx->extradata[3*4] & 1;
75 
76  for (y = 0; y < avctx->height; y++) {
77  int src_y = y;
78  if (frame->interlaced_frame)
79  src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2);
80  if (bits == 8) {
81  uint8_t *line = frame->data[0] + y*frame->linesize[0];
82  memcpy(line, buf + src_y*stride, 2*avctx->width);
83  } else {
84  int block;
85  uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]];
86  uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]];
87  uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]];
88  for (block = 0; 16*block < avctx->width; block ++) {
89  const uint8_t *buf_src = buf + src_y*stride + 40*block;
90  for (x = 0; x < 16 && x + 16*block < avctx->width; x++) {
91  int xd = x + 16*block;
92  if (x&1) {
93  luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3);
94  } else {
95  luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3);
96  cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3);
97  cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6);
98  }
99  }
100  }
101  }
102  }
103 
104  *got_frame = 1;
105  return avpkt->size;
106 }
107 
109  .name = "m101",
110  .long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"),
111  .type = AVMEDIA_TYPE_VIDEO,
112  .id = AV_CODEC_ID_M101,
113  .init = m101_decode_init,
114  .decode = m101_decode_frame,
115  .capabilities = AV_CODEC_CAP_DR1,
116 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: m101.c:46
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int size
Definition: avcodec.h:1401
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1697
AVCodec.
Definition: avcodec.h:3351
static av_cold int m101_decode_init(AVCodecContext *avctx)
Definition: m101.c:27
static int16_t block[64]
Definition: dct.c:115
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:106
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t
#define av_cold
Definition: attributes.h:82
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1588
static AVFrame * frame
uint8_t * data
Definition: avcodec.h:1400
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:348
ptrdiff_t size
Definition: opengl_enc.c:101
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
Definition: graph2dot.c:48
const char * name
Name of the codec implementation.
Definition: avcodec.h:3358
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:284
int width
picture width / height.
Definition: avcodec.h:1660
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
AVCodec ff_m101_decoder
Definition: m101.c:108
main external API structure.
Definition: avcodec.h:1488
packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
Definition: pixfmt.h:63
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1886
void * buf
Definition: avisynth_c.h:690
int extradata_size
Definition: avcodec.h:1589
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:369
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
common internal api header.
int top_field_first
If the content is interlaced, is top field displayed first.
Definition: frame.h:353
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:279
#define stride
static double cr(void *priv, double x, double y)
Definition: vf_geq.c:107
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1377
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:956
for(j=16;j >0;--j)