FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
libutvideodec.cpp
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2011 Derek Buitenhuis
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 General Public
8  * License as published by the Free Software Foundation;
9  * version 2 of the License.
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  * General Public License for more details.
15  *
16  * You should have received a copy of the GNU 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 /**
22  * @file
23  * Known FOURCCs:
24  * 'ULY0' (YCbCr 4:2:0), 'ULY2' (YCbCr 4:2:2), 'ULRG' (RGB), 'ULRA' (RGBA),
25  * 'ULH0' (YCbCr 4:2:0 BT.709), 'ULH2' (YCbCr 4:2:2 BT.709)
26  */
27 
28 extern "C" {
29 #include "avcodec.h"
30 }
31 
32 #include "libutvideo.h"
33 #include "get_bits.h"
34 
35 static av_cold int utvideo_decode_init(AVCodecContext *avctx)
36 {
37  UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
38  UtVideoExtra info;
39  int format;
40  int begin_ret;
41 
42  if (avctx->extradata_size != 16 && avctx->extradata_size != 8 ) {
43  av_log(avctx, AV_LOG_ERROR, "Extradata size (%d) mismatch.\n", avctx->extradata_size);
44  return -1;
45  }
46 
47  /* Read extradata */
48  info.version = AV_RL32(avctx->extradata);
49  info.original_format = AV_RL32(avctx->extradata + 4);
50  info.frameinfo_size = AV_RL32(avctx->extradata + 8);
51  info.flags = AV_RL32(avctx->extradata + 12);
52 
53  /* Pick format based on FOURCC */
54  switch (avctx->codec_tag) {
55 #ifdef UTV_BT709
56  case MKTAG('U', 'L', 'H', '0'):
57  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
58  avctx->colorspace = AVCOL_SPC_BT709;
59  format = UTVF_YV12;
60  break;
61  case MKTAG('U', 'L', 'H', '2'):
62  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
63  avctx->colorspace = AVCOL_SPC_BT709;
64  format = UTVF_YUY2;
65  break;
66 #endif
67  case MKTAG('U', 'L', 'Y', '0'):
68  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
69  format = UTVF_YV12;
70  break;
71  case MKTAG('U', 'L', 'Y', '2'):
72  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
73  format = UTVF_YUY2;
74  break;
75  case MKTAG('U', 'L', 'R', 'G'):
76  avctx->pix_fmt = AV_PIX_FMT_BGR24;
77  format = UTVF_NFCC_BGR_BU;
78  break;
79  case MKTAG('U', 'L', 'R', 'A'):
80  avctx->pix_fmt = AV_PIX_FMT_RGB32;
81  format = UTVF_NFCC_BGRA_BU;
82  break;
83 #ifdef UTVF_UQY2
84  case MKTAG('U', 'Q', 'Y', '2'):
85  avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
86  format = UTVF_v210;
87  break;
88 #endif
89  default:
90  av_log(avctx, AV_LOG_ERROR,
91  "Not a Ut Video FOURCC: %X\n", avctx->codec_tag);
92  return -1;
93  }
94 
95  /* Only allocate the buffer once */
96  utv->buf_size = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
97 #ifdef UTVF_UQY2
98  if (format == UTVF_v210)
99  utv->buf_size += avctx->height * ((avctx->width + 47) / 48) * 128; // the linesize used by the decoder, this does not seem to be exported
100 #endif
101  utv->buffer = (uint8_t *)av_malloc(utv->buf_size * sizeof(uint8_t));
102 
103  if (utv->buffer == NULL) {
104  av_log(avctx, AV_LOG_ERROR, "Unable to allocate output buffer.\n");
105  return -1;
106  }
107 
108  /* Allocate the output frame */
109  avctx->coded_frame = av_frame_alloc();
110 
111  /* Ut Video only supports 8-bit */
112  avctx->bits_per_raw_sample = 8;
113 
114  /* Is it interlaced? */
115  avctx->coded_frame->interlaced_frame = info.flags & 0x800 ? 1 : 0;
116 
117  /* Apparently Ut Video doesn't store this info... */
118  avctx->coded_frame->top_field_first = 1;
119 
120  /*
121  * Create a Ut Video instance. Since the function wants
122  * an "interface name" string, pass it the name of the lib.
123  */
124  utv->codec = CCodec::CreateInstance(UNFCC(avctx->codec_tag), "libavcodec");
125 
126  /* Initialize Decoding */
127  begin_ret = utv->codec->DecodeBegin(format, avctx->width, avctx->height,
128  CBGROSSWIDTH_WINDOWS, &info, sizeof(UtVideoExtra));
129 
130  /* Check to see if the decoder initlized properly */
131  if (begin_ret != 0) {
132  av_log(avctx, AV_LOG_ERROR,
133  "Could not initialize decoder: %d\n", begin_ret);
134  return -1;
135  }
136 
137  return 0;
138 }
139 
140 static int utvideo_decode_frame(AVCodecContext *avctx, void *data,
141  int *got_frame, AVPacket *avpkt)
142 {
143  UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
144  AVFrame *pic = avctx->coded_frame;
145  int w = avctx->width, h = avctx->height;
146 
147  /* Set flags */
148  pic->reference = 0;
149  pic->pict_type = AV_PICTURE_TYPE_I;
150  pic->key_frame = 1;
151 
152  /* Decode the frame */
153  utv->codec->DecodeFrame(utv->buffer, avpkt->data, true);
154 
155  /* Set the output data depending on the colorspace */
156  switch (avctx->pix_fmt) {
157  case AV_PIX_FMT_YUV420P:
158  pic->linesize[0] = w;
159  pic->linesize[1] = pic->linesize[2] = w / 2;
160  pic->data[0] = utv->buffer;
161  pic->data[2] = utv->buffer + (w * h);
162  pic->data[1] = pic->data[2] + (w * h / 4);
163  break;
164  case AV_PIX_FMT_YUYV422:
165  pic->linesize[0] = w * 2;
166  pic->data[0] = utv->buffer;
167  break;
168  case AV_PIX_FMT_YUV422P10: {
169  uint16_t *y, *u, *v;
170  int i,j;
171  int linesize = ((w + 47) / 48) * 128;
172 
173  pic->linesize[0] = w * 2;
174  pic->linesize[1] =
175  pic->linesize[2] = w;
176  pic->data[0] = utv->buffer + linesize * h;
177  pic->data[1] = pic->data[0] + h*pic->linesize[0];
178  pic->data[2] = pic->data[1] + h*pic->linesize[1];
179  y = (uint16_t*)pic->data[0];
180  u = (uint16_t*)pic->data[1];
181  v = (uint16_t*)pic->data[2];
182  for (j = 0; j < h; j++) {
183  const uint8_t *in = utv->buffer + j * linesize;
184 
185  for (i = 0; i + 1 < w; i += 6, in += 4) {
186  unsigned a,b;
187  a = AV_RL32(in);
188  in += 4;
189  b = AV_RL32(in);
190  *u++ = (a ) & 0x3FF;
191  *y++ = (a>>10) & 0x3FF;
192  *v++ = (a>>20) & 0x3FF;
193  *y++ = (b ) & 0x3FF;
194 
195  if (i + 3 >= w)
196  break;
197 
198  in += 4;
199  a = AV_RL32(in);
200  *u++ = (b>>10) & 0x3FF;
201  *y++ = (b>>20) & 0x3FF;
202  *v++ = (a ) & 0x3FF;
203  *y++ = (a>>10) & 0x3FF;
204 
205  if (i + 5 >= w)
206  break;
207 
208  in += 4;
209  b = AV_RL32(in);
210  *u++ = (a>>20) & 0x3FF;
211  *y++ = (b ) & 0x3FF;
212  *v++ = (b>>10) & 0x3FF;
213  *y++ = (b>>20) & 0x3FF;
214  }
215  }
216  break;
217  }
218  case AV_PIX_FMT_BGR24:
219  case AV_PIX_FMT_RGB32:
220  /* Make the linesize negative, since Ut Video uses bottom-up BGR */
221  pic->linesize[0] = -1 * w * (avctx->pix_fmt == AV_PIX_FMT_BGR24 ? 3 : 4);
222  pic->data[0] = utv->buffer + utv->buf_size + pic->linesize[0];
223  break;
224  }
225 
226  *got_frame = 1;
227  av_frame_move_ref((AVFrame*)data, pic);
228 
229  return avpkt->size;
230 }
231 
232 static av_cold int utvideo_decode_close(AVCodecContext *avctx)
233 {
234  UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
235 
236  /* Free output */
237  av_frame_free(&avctx->coded_frame);
238  av_freep(&utv->buffer);
239 
240  /* Finish decoding and clean up the instance */
241  utv->codec->DecodeEnd();
242  CCodec::DeleteInstance(utv->codec);
243 
244  return 0;
245 }
246 
247 AVCodec ff_libutvideo_decoder = {
248  "libutvideo",
249  NULL_IF_CONFIG_SMALL("Ut Video"),
250  AVMEDIA_TYPE_VIDEO,
251  AV_CODEC_ID_UTVIDEO,
252  0, //capabilities
253  NULL, //supported_framerates
254  NULL, //pix_fmts
255  NULL, //supported_samplerates
256  NULL, //sample_fmts
257  NULL, //channel_layouts
258  0, //max_lowres
259  NULL, //priv_class
260  NULL, //profiles
261  sizeof(UtVideoContext),
262  NULL, //next
263  NULL, //init_thread_copy
264  NULL, //update_thread_context
265  NULL, //defaults
266  NULL, //init_static_data
267  utvideo_decode_init,
268  NULL, //encode
269  NULL, //encode2
270  utvideo_decode_frame,
271  utvideo_decode_close,
272 };
Generated on Sun Mar 8 2015 02:34:55 for FFmpeg by   doxygen 1.8.2