FFmpeg
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;
58  frame->pict_type = AV_PICTURE_TYPE_I;
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 * 40;
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  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
117 };
AVCodec
AVCodec.
Definition: codec.h:197
stride
int stride
Definition: mace.c:144
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
m101_decode_init
static av_cold int m101_decode_init(AVCodecContext *avctx)
Definition: m101.c:27
cb
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:215
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
data
const char data[16]
Definition: mxf.c:142
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
av_cold
#define av_cold
Definition: attributes.h:90
ff_m101_decoder
const AVCodec ff_m101_decoder
Definition: m101.c:108
m101_decode_frame
static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: m101.c:46
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:603
intreadwrite.h
bits
uint8_t bits
Definition: vp3data.h:141
AV_PIX_FMT_YUYV422
@ AV_PIX_FMT_YUYV422
packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
Definition: pixfmt.h:67
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
AV_PIX_FMT_YUV422P10
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:390
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1638
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:366
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:117
size
int size
Definition: twinvq_data.h:10344
line
Definition: graph2dot.c:48
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:602
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
AVCodecContext::height
int height
Definition: avcodec.h:674
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:711
avcodec.h
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVCodecContext
main external API structure.
Definition: avcodec.h:501
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
AVPacket
This structure stores compressed data.
Definition: packet.h:342
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:674
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
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
AV_CODEC_ID_M101
@ AV_CODEC_ID_M101
Definition: codec_id.h:267