FFmpeg: libavcodec/libutvideoenc.cpp Source File

FFmpeg
libutvideoenc.cpp
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1 /*
2  * Copyright (c) 2012 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 "libavutil/avassert.h"
30 #include "avcodec.h"
31 #include "internal.h"
32 }
33 
34 #include "libutvideo.h"
35 #include "put_bits.h"
36 
37  static av_cold int utvideo_encode_init(AVCodecContext *avctx)
38 {
39  UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
40  UtVideoExtra *info;
41  uint32_t flags, in_format;
42 
43  switch (avctx->pix_fmt) {
44  case AV_PIX_FMT_YUV420P:
45  in_format = UTVF_YV12;
46  avctx->bits_per_coded_sample = 12;
47  if (avctx->colorspace == AVCOL_SPC_BT709)
48  avctx->codec_tag = MKTAG('U', 'L', 'H', '0');
49  else
50  avctx->codec_tag = MKTAG('U', 'L', 'Y', '0');
51  break;
52  case AV_PIX_FMT_YUYV422:
53  in_format = UTVF_YUYV;
54  avctx->bits_per_coded_sample = 16;
55  if (avctx->colorspace == AVCOL_SPC_BT709)
56  avctx->codec_tag = MKTAG('U', 'L', 'H', '2');
57  else
58  avctx->codec_tag = MKTAG('U', 'L', 'Y', '2');
59  break;
60  case AV_PIX_FMT_BGR24:
61  in_format = UTVF_NFCC_BGR_BU;
62  avctx->bits_per_coded_sample = 24;
63  avctx->codec_tag = MKTAG('U', 'L', 'R', 'G');
64  break;
65  case AV_PIX_FMT_RGB32:
66  in_format = UTVF_NFCC_BGRA_BU;
67  avctx->bits_per_coded_sample = 32;
68  avctx->codec_tag = MKTAG('U', 'L', 'R', 'A');
69  break;
70  default:
71  return AVERROR(EINVAL);
72  }
73 
74  /* Check before we alloc anything */
75  if (avctx->prediction_method != 0 && avctx->prediction_method != 2) {
76  av_log(avctx, AV_LOG_ERROR, "Invalid prediction method.\n");
77  return AVERROR(EINVAL);
78  }
79 
80  flags = ((avctx->prediction_method + 1) << 8) | (avctx->thread_count - 1);
81 
82  avctx->priv_data = utv;
83  avctx->coded_frame = av_frame_alloc();
84 
85  /* Alloc extradata buffer */
86  info = (UtVideoExtra *)av_malloc(sizeof(*info));
87 
88  if (!info) {
89  av_log(avctx, AV_LOG_ERROR, "Could not allocate extradata buffer.\n");
90  return AVERROR(ENOMEM);
91  }
92 
93  /*
94  * We use this buffer to hold the data that Ut Video returns,
95  * since we cannot decode planes separately with it.
96  */
97  utv->buf_size = avpicture_get_size(avctx->pix_fmt,
98  avctx->width, avctx->height);
99  utv->buffer = (uint8_t *)av_malloc(utv->buf_size);
100 
101  if (utv->buffer == NULL) {
102  av_log(avctx, AV_LOG_ERROR, "Could not allocate output buffer.\n");
103  return AVERROR(ENOMEM);
104  }
105 
106  /*
107  * Create a Ut Video instance. Since the function wants
108  * an "interface name" string, pass it the name of the lib.
109  */
110  utv->codec = CCodec::CreateInstance(UNFCC(avctx->codec_tag), "libavcodec");
111 
112  /* Initialize encoder */
113  utv->codec->EncodeBegin(in_format, avctx->width, avctx->height,
114  CBGROSSWIDTH_WINDOWS);
115 
116  /* Get extradata from encoder */
117  avctx->extradata_size = utv->codec->EncodeGetExtraDataSize();
118  utv->codec->EncodeGetExtraData(info, avctx->extradata_size, in_format,
119  avctx->width, avctx->height,
120  CBGROSSWIDTH_WINDOWS);
121  avctx->extradata = (uint8_t *)info;
122 
123  /* Set flags */
124  utv->codec->SetState(&flags, sizeof(flags));
125 
126  return 0;
127 }
128 
129  static int utvideo_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
130  const AVFrame *pic, int *got_packet)
131 {
132  UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
133  int w = avctx->width, h = avctx->height;
134  int ret, rgb_size, i;
135  bool keyframe;
136  uint8_t *y, *u, *v;
137  uint8_t *dst;
138 
139  /* Alloc buffer */
140  if ((ret = ff_alloc_packet2(avctx, pkt, utv->buf_size)) < 0)
141  return ret;
142 
143  dst = pkt->data;
144 
145  /* Move input if needed data into Ut Video friendly buffer */
146  switch (avctx->pix_fmt) {
147  case AV_PIX_FMT_YUV420P:
148  y = utv->buffer;
149  u = y + w * h;
150  v = u + w * h / 4;
151  for (i = 0; i < h; i++) {
152  memcpy(y, pic->data[0] + i * pic->linesize[0], w);
153  y += w;
154  }
155  for (i = 0; i < h / 2; i++) {
156  memcpy(u, pic->data[2] + i * pic->linesize[2], w >> 1);
157  memcpy(v, pic->data[1] + i * pic->linesize[1], w >> 1);
158  u += w >> 1;
159  v += w >> 1;
160  }
161  break;
162  case AV_PIX_FMT_YUYV422:
163  for (i = 0; i < h; i++)
164  memcpy(utv->buffer + i * (w << 1),
165  pic->data[0] + i * pic->linesize[0], w << 1);
166  break;
167  case AV_PIX_FMT_BGR24:
168  case AV_PIX_FMT_RGB32:
169  /* Ut Video takes bottom-up BGR */
170  rgb_size = avctx->pix_fmt == AV_PIX_FMT_BGR24 ? 3 : 4;
171  for (i = 0; i < h; i++)
172  memcpy(utv->buffer + (h - i - 1) * w * rgb_size,
173  pic->data[0] + i * pic->linesize[0],
174  w * rgb_size);
175  break;
176  default:
177  return AVERROR(EINVAL);
178  }
179 
180  /* Encode frame */
181  pkt->size = utv->codec->EncodeFrame(dst, &keyframe, utv->buffer);
182 
183  if (!pkt->size) {
184  av_log(avctx, AV_LOG_ERROR, "EncodeFrame failed!\n");
185  return AVERROR_INVALIDDATA;
186  }
187 
188  /*
189  * Ut Video is intra-only and every frame is a keyframe,
190  * and the API always returns true. In case something
191  * durastic changes in the future, such as inter support,
192  * assert that this is true.
193  */
194  av_assert2(keyframe == true);
195  avctx->coded_frame->key_frame = 1;
196  avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
197 
198  pkt->flags |= AV_PKT_FLAG_KEY;
199  *got_packet = 1;
200  return 0;
201 }
202 
203  static av_cold int utvideo_encode_close(AVCodecContext *avctx)
204 {
205  UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
206 
207  av_freep(&avctx->coded_frame);
208  av_freep(&avctx->extradata);
209  av_freep(&utv->buffer);
210 
211  utv->codec->EncodeEnd();
212  CCodec::DeleteInstance(utv->codec);
213 
214  return 0;
215 }
216 
217  AVCodec ff_libutvideo_encoder = {
218  "libutvideo",
219  NULL_IF_CONFIG_SMALL("Ut Video"),
220  AVMEDIA_TYPE_VIDEO,
221  AV_CODEC_ID_UTVIDEO,
222  CODEC_CAP_AUTO_THREADS | CODEC_CAP_LOSSLESS,
223  NULL, /* supported_framerates */
224  (const enum AVPixelFormat[]) {
225  AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUYV422, AV_PIX_FMT_BGR24,
226  AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE
227  },
228  NULL, /* supported_samplerates */
229  NULL, /* sample_fmts */
230  NULL, /* channel_layouts */
231  0, /* max_lowres */
232  NULL, /* priv_class */
233  NULL, /* profiles */
234  sizeof(UtVideoContext),
235  NULL, /* next */
236  NULL, /* init_thread_copy */
237  NULL, /* update_thread_context */
238  NULL, /* defaults */
239  NULL, /* init_static_data */
240  utvideo_encode_init,
241  NULL, /* encode */
242  utvideo_encode_frame,
243  NULL, /* decode */
244  utvideo_encode_close,
245  NULL, /* flush */
246 };
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