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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 "bswapdsp.h"
29 #include "get_bits.h"
30 #include "internal.h"
31 #include "raw.h"
32 #include "libavutil/avassert.h"
33 #include "libavutil/buffer.h"
34 #include "libavutil/common.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavutil/imgutils.h"
37 #include "libavutil/opt.h"
38 
39 typedef struct RawVideoContext {
42  int frame_size; /* size of the frame in bytes */
43  int flip;
44  int is_2_4_bpp; // 2 or 4 bpp raw in avi/mov
45  int is_yuv2;
46  int is_lt_16bpp; // 16bpp pixfmt and bits_per_coded_sample < 16
47  int tff;
48 
51  unsigned int bitstream_buf_size;
53 
54 static const AVOption options[]={
55 {"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},
56 {NULL}
57 };
58 
59 static const AVClass rawdec_class = {
60  .class_name = "rawdec",
61  .option = options,
62  .version = LIBAVUTIL_VERSION_INT,
63 };
64 
66 {
67  RawVideoContext *context = avctx->priv_data;
68  const AVPixFmtDescriptor *desc;
69 
70  ff_bswapdsp_init(&context->bbdsp);
71 
72  if ( avctx->codec_tag == MKTAG('r','a','w',' ')
73  || avctx->codec_tag == MKTAG('N','O','1','6'))
75  avctx->bits_per_coded_sample);
76  else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W'))
78  avctx->bits_per_coded_sample);
79  else if (avctx->codec_tag && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0))
81  else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample)
83  avctx->bits_per_coded_sample);
84 
85  desc = av_pix_fmt_desc_get(avctx->pix_fmt);
86  if (!desc) {
87  av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n");
88  return AVERROR(EINVAL);
89  }
90 
93  if (!context->palette)
94  return AVERROR(ENOMEM);
95  if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
96  avpriv_set_systematic_pal2((uint32_t*)context->palette->data, avctx->pix_fmt);
97  else
98  memset(context->palette->data, 0, AVPALETTE_SIZE);
99  }
100 
101  if ((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
102  avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
103  (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))) {
104  context->is_2_4_bpp = 1;
105  context->frame_size = avpicture_get_size(avctx->pix_fmt,
106  FFALIGN(avctx->width, 16),
107  avctx->height);
108  } else {
109  context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 && avctx->bits_per_coded_sample && avctx->bits_per_coded_sample < 16;
110  context->frame_size = avpicture_get_size(avctx->pix_fmt, avctx->width,
111  avctx->height);
112  }
113 
114  if ((avctx->extradata_size >= 9 &&
115  !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
116  avctx->codec_tag == MKTAG('c','y','u','v') ||
117  avctx->codec_tag == MKTAG(3, 0, 0, 0) ||
118  avctx->codec_tag == MKTAG('W','R','A','W'))
119  context->flip = 1;
120 
121  if (avctx->codec_tag == AV_RL32("yuv2") &&
122  avctx->pix_fmt == AV_PIX_FMT_YUYV422)
123  context->is_yuv2 = 1;
124 
125  return 0;
126 }
127 
128 static void flip(AVCodecContext *avctx, AVPicture *picture)
129 {
130  picture->data[0] += picture->linesize[0] * (avctx->height - 1);
131  picture->linesize[0] *= -1;
132 }
133 
134 /*
135  * Scale sample to 16-bit resolution
136  */
137 #define SCALE16(x, bits) (((x) << (16 - (bits))) | ((x) >> (2 * (bits) - 16)))
138 
139 /**
140  * Scale buffer to 16 bits per coded sample resolution
141  */
142 #define MKSCALE16(name, r16, w16) \
143 static void name(AVCodecContext *avctx, uint8_t * dst, const uint8_t *buf, int buf_size, int packed) \
144 { \
145  int i; \
146  if (!packed) { \
147  for (i = 0; i + 1 < buf_size; i += 2) \
148  w16(dst + i, SCALE16(r16(buf + i), avctx->bits_per_coded_sample)); \
149  } else { \
150  GetBitContext gb; \
151  init_get_bits(&gb, buf, buf_size * 8); \
152  for (i = 0; i < avctx->width * avctx->height; i++) { \
153  int sample = get_bits(&gb, avctx->bits_per_coded_sample); \
154  w16(dst + i*2, SCALE16(sample, avctx->bits_per_coded_sample)); \
155  } \
156  } \
157 }
158 
159 MKSCALE16(scale16be, AV_RB16, AV_WB16)
160 MKSCALE16(scale16le, AV_RL16, AV_WL16)
161 
162 static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
163  AVPacket *avpkt)
164 {
165  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
166  RawVideoContext *context = avctx->priv_data;
167  const uint8_t *buf = avpkt->data;
168  int buf_size = avpkt->size;
169  int linesize_align = 4;
170  int res, len;
171  int need_copy = !avpkt->buf || context->is_2_4_bpp || context->is_yuv2 || context->is_lt_16bpp;
172 
173  AVFrame *frame = data;
174  AVPicture *picture = data;
175 
176  frame->pict_type = AV_PICTURE_TYPE_I;
177  frame->key_frame = 1;
178 
179  res = ff_decode_frame_props(avctx, frame);
180  if (res < 0)
181  return res;
182 
183  av_frame_set_pkt_pos (frame, avctx->internal->pkt->pos);
184  av_frame_set_pkt_duration(frame, avctx->internal->pkt->duration);
185 
186  if (context->tff >= 0) {
187  frame->interlaced_frame = 1;
188  frame->top_field_first = context->tff;
189  }
190 
191  if ((res = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
192  return res;
193 
194  if (need_copy)
195  frame->buf[0] = av_buffer_alloc(FFMAX(context->frame_size, buf_size));
196  else
197  frame->buf[0] = av_buffer_ref(avpkt->buf);
198  if (!frame->buf[0])
199  return AVERROR(ENOMEM);
200 
201  //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
202  if (context->is_2_4_bpp) {
203  int i;
204  uint8_t *dst = frame->buf[0]->data;
205  buf_size = context->frame_size - AVPALETTE_SIZE;
206  if (avctx->bits_per_coded_sample == 4) {
207  for (i = 0; 2 * i + 1 < buf_size && i<avpkt->size; i++) {
208  dst[2 * i + 0] = buf[i] >> 4;
209  dst[2 * i + 1] = buf[i] & 15;
210  }
211  linesize_align = 8;
212  } else {
213  av_assert0(avctx->bits_per_coded_sample == 2);
214  for (i = 0; 4 * i + 3 < buf_size && i<avpkt->size; i++) {
215  dst[4 * i + 0] = buf[i] >> 6;
216  dst[4 * i + 1] = buf[i] >> 4 & 3;
217  dst[4 * i + 2] = buf[i] >> 2 & 3;
218  dst[4 * i + 3] = buf[i] & 3;
219  }
220  linesize_align = 16;
221  }
222  buf = dst;
223  } else if (context->is_lt_16bpp) {
224  uint8_t *dst = frame->buf[0]->data;
225  int packed = (avctx->codec_tag & 0xFFFFFF) == MKTAG('B','I','T', 0);
226  int swap = avctx->codec_tag >> 24;
227 
228  if (packed && swap) {
229  av_fast_padded_malloc(&context->bitstream_buf, &context->bitstream_buf_size, buf_size);
230  if (!context->bitstream_buf)
231  return AVERROR(ENOMEM);
232  if (swap == 16)
233  context->bbdsp.bswap16_buf(context->bitstream_buf, (const uint16_t*)buf, buf_size / 2);
234  else if (swap == 32)
235  context->bbdsp.bswap_buf(context->bitstream_buf, (const uint32_t*)buf, buf_size / 4);
236  else
237  return AVERROR_INVALIDDATA;
238  buf = context->bitstream_buf;
239  }
240 
241  if (desc->flags & AV_PIX_FMT_FLAG_BE)
242  scale16be(avctx, dst, buf, buf_size, packed);
243  else
244  scale16le(avctx, dst, buf, buf_size, packed);
245 
246  buf = dst;
247  } else if (need_copy) {
248  memcpy(frame->buf[0]->data, buf, buf_size);
249  buf = frame->buf[0]->data;
250  }
251 
252  if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
253  avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
254  buf += buf_size - context->frame_size;
255 
256  len = context->frame_size - (avctx->pix_fmt==AV_PIX_FMT_PAL8 ? AVPALETTE_SIZE : 0);
257  if (buf_size < len && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0)) {
258  av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < expected frame_size %d\n", buf_size, len);
259  av_buffer_unref(&frame->buf[0]);
260  return AVERROR(EINVAL);
261  }
262 
263  if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,
264  avctx->width, avctx->height)) < 0) {
265  av_buffer_unref(&frame->buf[0]);
266  return res;
267  }
268 
269  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
271  NULL);
272 
273  if (pal) {
274  av_buffer_unref(&context->palette);
276  if (!context->palette) {
277  av_buffer_unref(&frame->buf[0]);
278  return AVERROR(ENOMEM);
279  }
280  memcpy(context->palette->data, pal, AVPALETTE_SIZE);
281  frame->palette_has_changed = 1;
282  }
283  }
284 
285  if ((avctx->pix_fmt==AV_PIX_FMT_BGR24 ||
286  avctx->pix_fmt==AV_PIX_FMT_GRAY8 ||
287  avctx->pix_fmt==AV_PIX_FMT_RGB555LE ||
288  avctx->pix_fmt==AV_PIX_FMT_RGB555BE ||
289  avctx->pix_fmt==AV_PIX_FMT_RGB565LE ||
290  avctx->pix_fmt==AV_PIX_FMT_MONOWHITE ||
291  avctx->pix_fmt==AV_PIX_FMT_PAL8) &&
292  FFALIGN(frame->linesize[0], linesize_align) * avctx->height <= buf_size)
293  frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align);
294 
295  if (avctx->pix_fmt == AV_PIX_FMT_NV12 && avctx->codec_tag == MKTAG('N', 'V', '1', '2') &&
296  FFALIGN(frame->linesize[0], linesize_align) * avctx->height +
297  FFALIGN(frame->linesize[1], linesize_align) * ((avctx->height + 1) / 2) <= buf_size) {
298  int la0 = FFALIGN(frame->linesize[0], linesize_align);
299  frame->data[1] += (la0 - frame->linesize[0]) * avctx->height;
300  frame->linesize[0] = la0;
301  frame->linesize[1] = FFALIGN(frame->linesize[1], linesize_align);
302  }
303 
304  if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->frame_size) ||
305  (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) {
306  frame->buf[1] = av_buffer_ref(context->palette);
307  if (!frame->buf[1]) {
308  av_buffer_unref(&frame->buf[0]);
309  return AVERROR(ENOMEM);
310  }
311  frame->data[1] = frame->buf[1]->data;
312  }
313 
314  if (avctx->pix_fmt == AV_PIX_FMT_BGR24 &&
315  ((frame->linesize[0] + 3) & ~3) * avctx->height <= buf_size)
316  frame->linesize[0] = (frame->linesize[0] + 3) & ~3;
317 
318  if (context->flip)
319  flip(avctx, picture);
320 
321  if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2') ||
322  avctx->codec_tag == MKTAG('Y', 'V', '1', '6') ||
323  avctx->codec_tag == MKTAG('Y', 'V', '2', '4') ||
324  avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
325  FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
326 
327  if (avctx->codec_tag == AV_RL32("I420") && (avctx->width+1)*(avctx->height+1) * 3/2 == buf_size) {
328  picture->data[1] = picture->data[1] + (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height;
329  picture->data[2] = picture->data[2] + ((avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height)*5/4;
330  }
331 
332  if (avctx->codec_tag == AV_RL32("yuv2") &&
333  avctx->pix_fmt == AV_PIX_FMT_YUYV422) {
334  int x, y;
335  uint8_t *line = picture->data[0];
336  for (y = 0; y < avctx->height; y++) {
337  for (x = 0; x < avctx->width; x++)
338  line[2 * x + 1] ^= 0x80;
339  line += picture->linesize[0];
340  }
341  }
342 
343  if (avctx->field_order > AV_FIELD_PROGRESSIVE) { /* we have interlaced material flagged in container */
344  frame->interlaced_frame = 1;
345  if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
346  frame->top_field_first = 1;
347  }
348 
349  *got_frame = 1;
350  return buf_size;
351 }
352 
354 {
355  RawVideoContext *context = avctx->priv_data;
356 
357  av_buffer_unref(&context->palette);
358  return 0;
359 }
360 
362  .name = "rawvideo",
363  .long_name = NULL_IF_CONFIG_SMALL("raw video"),
364  .type = AVMEDIA_TYPE_VIDEO,
365  .id = AV_CODEC_ID_RAWVIDEO,
366  .priv_data_size = sizeof(RawVideoContext),
369  .decode = raw_decode,
370  .priv_class = &rawdec_class,
371 };