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rawdec.c
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1 /*
2  * Raw Video Decoder
3  * Copyright (c) 2001 Fabrice Bellard
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  * Raw Video Decoder
25  */
26 
27 #include "avcodec.h"
28 #include "raw.h"
29 #include "libavutil/avassert.h"
30 #include "libavutil/common.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/opt.h"
34 
35 typedef struct RawVideoContext {
38  unsigned char *buffer; /* block of memory for holding one frame */
39  int length; /* number of bytes in buffer */
40  int flip;
41  AVFrame pic; ///< AVCodecContext.coded_frame
42  int tff;
44 
45 static const AVOption options[]={
46 {"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM},
47 {NULL}
48 };
49 
50 static const AVClass class = {
51  .class_name = "rawdec",
52  .option = options,
54 };
55 
56 static const PixelFormatTag pix_fmt_bps_avi[] = {
57  { AV_PIX_FMT_MONOWHITE, 1 },
58  { AV_PIX_FMT_PAL8, 2 },
59  { AV_PIX_FMT_PAL8, 4 },
60  { AV_PIX_FMT_PAL8, 8 },
61  { AV_PIX_FMT_RGB444LE, 12 },
62  { AV_PIX_FMT_RGB555LE, 15 },
63  { AV_PIX_FMT_RGB555LE, 16 },
64  { AV_PIX_FMT_BGR24, 24 },
65  { AV_PIX_FMT_BGRA, 32 },
66  { AV_PIX_FMT_NONE, 0 },
67 };
68 
69 static const PixelFormatTag pix_fmt_bps_mov[] = {
70  { AV_PIX_FMT_MONOWHITE, 1 },
71  { AV_PIX_FMT_PAL8, 2 },
72  { AV_PIX_FMT_PAL8, 4 },
73  { AV_PIX_FMT_PAL8, 8 },
74  // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
75  // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
76  { AV_PIX_FMT_RGB555BE, 16 },
77  { AV_PIX_FMT_RGB24, 24 },
78  { AV_PIX_FMT_ARGB, 32 },
79  { AV_PIX_FMT_MONOWHITE,33 },
80  { AV_PIX_FMT_NONE, 0 },
81 };
82 
84  unsigned int fourcc)
85 {
86  while (tags->pix_fmt >= 0) {
87  if (tags->fourcc == fourcc)
88  return tags->pix_fmt;
89  tags++;
90  }
91  return AV_PIX_FMT_NONE;
92 }
93 
94 #if LIBAVCODEC_VERSION_MAJOR < 55
95 enum AVPixelFormat ff_find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc)
96 {
97  return avpriv_find_pix_fmt(tags, fourcc);
98 }
99 #endif
100 
102 {
103  RawVideoContext *context = avctx->priv_data;
104 
105  if ( avctx->codec_tag == MKTAG('r','a','w',' ')
106  || avctx->codec_tag == MKTAG('N','O','1','6'))
107  avctx->pix_fmt = avpriv_find_pix_fmt(pix_fmt_bps_mov,
108  avctx->bits_per_coded_sample);
109  else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W'))
110  avctx->pix_fmt = avpriv_find_pix_fmt(pix_fmt_bps_avi,
111  avctx->bits_per_coded_sample);
112  else if (avctx->codec_tag)
114  else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample)
115  avctx->pix_fmt = avpriv_find_pix_fmt(pix_fmt_bps_avi,
116  avctx->bits_per_coded_sample);
117 
118  if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
119  av_log(avctx, AV_LOG_ERROR, "Pixel format was not specified and cannot be detected\n");
120  return AVERROR(EINVAL);
121  }
122 
123  avpriv_set_systematic_pal2(context->palette, avctx->pix_fmt);
124  if ((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
125  avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
126  (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))) {
127  context->length = avpicture_get_size(avctx->pix_fmt,
128  FFALIGN(avctx->width, 16),
129  avctx->height);
130  if (context->length < 0)
131  return context->length;
132  context->buffer = av_malloc(context->length);
133  if (!context->buffer)
134  return AVERROR(ENOMEM);
135  } else {
136  context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
137  if (context->length < 0)
138  return context->length;
139  }
140  context->pic.pict_type = AV_PICTURE_TYPE_I;
141  context->pic.key_frame = 1;
142 
143  avctx->coded_frame = &context->pic;
144 
145  if ((avctx->extradata_size >= 9 &&
146  !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
147  avctx->codec_tag == MKTAG('c','y','u','v') ||
148  avctx->codec_tag == MKTAG(3, 0, 0, 0) ||
149  avctx->codec_tag == MKTAG('W','R','A','W'))
150  context->flip = 1;
151 
152  if (avctx->field_order > AV_FIELD_PROGRESSIVE) { /*we have interlaced material flagged in container */
153  avctx->coded_frame->interlaced_frame = 1;
154  if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
155  avctx->coded_frame->top_field_first = 1;
156  }
157 
158 
159  return 0;
160 }
161 
162 static void flip(AVCodecContext *avctx, AVPicture *picture)
163 {
164  picture->data[0] += picture->linesize[0] * (avctx->height - 1);
165  picture->linesize[0] *= -1;
166 }
167 
168 static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
169  AVPacket *avpkt)
170 {
171  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
172  RawVideoContext *context = avctx->priv_data;
173  const uint8_t *buf = avpkt->data;
174  int buf_size = avpkt->size;
175  int linesize_align = 4;
176  int res, len;
177 
178  AVFrame *frame = data;
179  AVPicture *picture = data;
180 
181  frame->pict_type = avctx->coded_frame->pict_type;
184  frame->reordered_opaque = avctx->reordered_opaque;
185  frame->pkt_pts = avctx->pkt->pts;
186  av_frame_set_pkt_pos (frame, avctx->pkt->pos);
187  av_frame_set_pkt_duration(frame, avctx->pkt->duration);
188 
189  if (context->tff >= 0) {
190  frame->interlaced_frame = 1;
191  frame->top_field_first = context->tff;
192  }
193 
194  if ((res = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
195  return res;
196 
197  //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
198  if (context->buffer) {
199  int i;
200  uint8_t *dst = context->buffer;
201  buf_size = context->length - AVPALETTE_SIZE;
202  if (avctx->bits_per_coded_sample == 4) {
203  for (i = 0; 2 * i + 1 < buf_size && i<avpkt->size; i++) {
204  dst[2 * i + 0] = buf[i] >> 4;
205  dst[2 * i + 1] = buf[i] & 15;
206  }
207  linesize_align = 8;
208  } else {
209  av_assert0(avctx->bits_per_coded_sample == 2);
210  for (i = 0; 4 * i + 3 < buf_size && i<avpkt->size; i++) {
211  dst[4 * i + 0] = buf[i] >> 6;
212  dst[4 * i + 1] = buf[i] >> 4 & 3;
213  dst[4 * i + 2] = buf[i] >> 2 & 3;
214  dst[4 * i + 3] = buf[i] & 3;
215  }
216  linesize_align = 16;
217  }
218  buf = dst;
219  }
220 
221  if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
222  avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
223  buf += buf_size - context->length;
224 
225  len = context->length - (avctx->pix_fmt==AV_PIX_FMT_PAL8 ? AVPALETTE_SIZE : 0);
226  if (buf_size < len) {
227  av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < expected length %d\n", buf_size, len);
228  return AVERROR(EINVAL);
229  }
230 
231  if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,
232  avctx->width, avctx->height)) < 0)
233  return res;
234  if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->length) ||
235  (desc->flags & PIX_FMT_PSEUDOPAL)) {
236  frame->data[1] = (uint8_t*)context->palette;
237  }
238  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
240  NULL);
241 
242  if (pal) {
243  memcpy(frame->data[1], pal, AVPALETTE_SIZE);
244  frame->palette_has_changed = 1;
245  }
246  }
247  if ((avctx->pix_fmt==AV_PIX_FMT_BGR24 ||
248  avctx->pix_fmt==AV_PIX_FMT_GRAY8 ||
249  avctx->pix_fmt==AV_PIX_FMT_RGB555LE ||
250  avctx->pix_fmt==AV_PIX_FMT_RGB555BE ||
251  avctx->pix_fmt==AV_PIX_FMT_RGB565LE ||
252  avctx->pix_fmt==AV_PIX_FMT_MONOWHITE ||
253  avctx->pix_fmt==AV_PIX_FMT_PAL8) &&
254  FFALIGN(frame->linesize[0], linesize_align) * avctx->height <= buf_size)
255  frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align);
256 
257  if (avctx->pix_fmt == AV_PIX_FMT_NV12 && avctx->codec_tag == MKTAG('N', 'V', '1', '2') &&
258  FFALIGN(frame->linesize[0], linesize_align) * avctx->height +
259  FFALIGN(frame->linesize[1], linesize_align) * ((avctx->height + 1) / 2) <= buf_size) {
260  int la0 = FFALIGN(frame->linesize[0], linesize_align);
261  frame->data[1] += (la0 - frame->linesize[0]) * avctx->height;
262  frame->linesize[0] = la0;
263  frame->linesize[1] = FFALIGN(frame->linesize[1], linesize_align);
264  }
265 
266  if (context->flip)
267  flip(avctx, picture);
268 
269  if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2') ||
270  avctx->codec_tag == MKTAG('Y', 'V', '1', '6') ||
271  avctx->codec_tag == MKTAG('Y', 'V', '2', '4') ||
272  avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
273  FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
274 
275  if (avctx->codec_tag == AV_RL32("I420") && (avctx->width+1)*(avctx->height+1) * 3/2 == buf_size) {
276  picture->data[1] = picture->data[1] + (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height;
277  picture->data[2] = picture->data[2] + ((avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height)*5/4;
278  }
279 
280  if (avctx->codec_tag == AV_RL32("yuv2") &&
281  avctx->pix_fmt == AV_PIX_FMT_YUYV422) {
282  int x, y;
283  uint8_t *line = picture->data[0];
284  for (y = 0; y < avctx->height; y++) {
285  for (x = 0; x < avctx->width; x++)
286  line[2 * x + 1] ^= 0x80;
287  line += picture->linesize[0];
288  }
289  }
290  if (avctx->codec_tag == AV_RL32("YVYU") &&
291  avctx->pix_fmt == AV_PIX_FMT_YUYV422) {
292  int x, y;
293  uint8_t *line = picture->data[0];
294  for(y = 0; y < avctx->height; y++) {
295  for(x = 0; x < avctx->width - 1; x += 2)
296  FFSWAP(uint8_t, line[2*x + 1], line[2*x + 3]);
297  line += picture->linesize[0];
298  }
299  }
300 
301  *got_frame = 1;
302  return buf_size;
303 }
304 
306 {
307  RawVideoContext *context = avctx->priv_data;
308 
309  av_freep(&context->buffer);
310  return 0;
311 }
312 
314  .name = "rawvideo",
315  .type = AVMEDIA_TYPE_VIDEO,
316  .id = AV_CODEC_ID_RAWVIDEO,
317  .priv_data_size = sizeof(RawVideoContext),
320  .decode = raw_decode,
321  .long_name = NULL_IF_CONFIG_SMALL("raw video"),
322  .priv_class = &class,
323 };