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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->extradata_size >= 9 &&
102  !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
103  avctx->codec_tag == MKTAG('c','y','u','v') ||
104  avctx->codec_tag == MKTAG(3, 0, 0, 0) ||
105  avctx->codec_tag == MKTAG('W','R','A','W'))
106  context->flip = 1;
107 
108  if (avctx->codec_tag == AV_RL32("yuv2") &&
109  avctx->pix_fmt == AV_PIX_FMT_YUYV422)
110  context->is_yuv2 = 1;
111 
112  return 0;
113 }
114 
115 static void flip(AVCodecContext *avctx, AVPicture *picture)
116 {
117  picture->data[0] += picture->linesize[0] * (avctx->height - 1);
118  picture->linesize[0] *= -1;
119 }
120 
121 /*
122  * Scale sample to 16-bit resolution
123  */
124 #define SCALE16(x, bits) (((x) << (16 - (bits))) | ((x) >> (2 * (bits) - 16)))
125 
126 /**
127  * Scale buffer to 16 bits per coded sample resolution
128  */
129 #define MKSCALE16(name, r16, w16) \
130 static void name(AVCodecContext *avctx, uint8_t * dst, const uint8_t *buf, int buf_size, int packed) \
131 { \
132  int i; \
133  if (!packed) { \
134  for (i = 0; i + 1 < buf_size; i += 2) \
135  w16(dst + i, SCALE16(r16(buf + i), avctx->bits_per_coded_sample)); \
136  } else { \
137  GetBitContext gb; \
138  init_get_bits(&gb, buf, buf_size * 8); \
139  for (i = 0; i < avctx->width * avctx->height; i++) { \
140  int sample = get_bits(&gb, avctx->bits_per_coded_sample); \
141  w16(dst + i*2, SCALE16(sample, avctx->bits_per_coded_sample)); \
142  } \
143  } \
144 }
145 
146 MKSCALE16(scale16be, AV_RB16, AV_WB16)
147 MKSCALE16(scale16le, AV_RL16, AV_WL16)
148 
149 static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
150  AVPacket *avpkt)
151 {
152  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
153  RawVideoContext *context = avctx->priv_data;
154  const uint8_t *buf = avpkt->data;
155  int buf_size = avpkt->size;
156  int linesize_align = 4;
157  int res, len;
158  int need_copy;
159 
160  AVFrame *frame = data;
161  AVPicture *picture = data;
162 
163  if ((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
164  avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
165  (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))) {
166  context->is_2_4_bpp = 1;
167  context->frame_size = avpicture_get_size(avctx->pix_fmt,
168  FFALIGN(avctx->width, 16),
169  avctx->height);
170  } else {
171  context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 && avctx->bits_per_coded_sample && avctx->bits_per_coded_sample < 16;
172  context->frame_size = avpicture_get_size(avctx->pix_fmt, avctx->width,
173  avctx->height);
174  }
175  need_copy = !avpkt->buf || context->is_2_4_bpp || context->is_yuv2 || context->is_lt_16bpp;
176 
177  frame->pict_type = AV_PICTURE_TYPE_I;
178  frame->key_frame = 1;
179 
180  res = ff_decode_frame_props(avctx, frame);
181  if (res < 0)
182  return res;
183 
184  av_frame_set_pkt_pos (frame, avctx->internal->pkt->pos);
185  av_frame_set_pkt_duration(frame, avctx->internal->pkt->duration);
186 
187  if (context->tff >= 0) {
188  frame->interlaced_frame = 1;
189  frame->top_field_first = context->tff;
190  }
191 
192  if ((res = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
193  return res;
194 
195  if (need_copy)
196  frame->buf[0] = av_buffer_alloc(FFMAX(context->frame_size, buf_size));
197  else
198  frame->buf[0] = av_buffer_ref(avpkt->buf);
199  if (!frame->buf[0])
200  return AVERROR(ENOMEM);
201 
202  //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
203  if (context->is_2_4_bpp) {
204  int i;
205  uint8_t *dst = frame->buf[0]->data;
206  buf_size = context->frame_size - AVPALETTE_SIZE;
207  if (avctx->bits_per_coded_sample == 4) {
208  for (i = 0; 2 * i + 1 < buf_size && i<avpkt->size; i++) {
209  dst[2 * i + 0] = buf[i] >> 4;
210  dst[2 * i + 1] = buf[i] & 15;
211  }
212  linesize_align = 8;
213  } else {
214  av_assert0(avctx->bits_per_coded_sample == 2);
215  for (i = 0; 4 * i + 3 < buf_size && i<avpkt->size; i++) {
216  dst[4 * i + 0] = buf[i] >> 6;
217  dst[4 * i + 1] = buf[i] >> 4 & 3;
218  dst[4 * i + 2] = buf[i] >> 2 & 3;
219  dst[4 * i + 3] = buf[i] & 3;
220  }
221  linesize_align = 16;
222  }
223  buf = dst;
224  } else if (context->is_lt_16bpp) {
225  uint8_t *dst = frame->buf[0]->data;
226  int packed = (avctx->codec_tag & 0xFFFFFF) == MKTAG('B','I','T', 0);
227  int swap = avctx->codec_tag >> 24;
228 
229  if (packed && swap) {
230  av_fast_padded_malloc(&context->bitstream_buf, &context->bitstream_buf_size, buf_size);
231  if (!context->bitstream_buf)
232  return AVERROR(ENOMEM);
233  if (swap == 16)
234  context->bbdsp.bswap16_buf(context->bitstream_buf, (const uint16_t*)buf, buf_size / 2);
235  else if (swap == 32)
236  context->bbdsp.bswap_buf(context->bitstream_buf, (const uint32_t*)buf, buf_size / 4);
237  else
238  return AVERROR_INVALIDDATA;
239  buf = context->bitstream_buf;
240  }
241 
242  if (desc->flags & AV_PIX_FMT_FLAG_BE)
243  scale16be(avctx, dst, buf, buf_size, packed);
244  else
245  scale16le(avctx, dst, buf, buf_size, packed);
246 
247  buf = dst;
248  } else if (need_copy) {
249  memcpy(frame->buf[0]->data, buf, buf_size);
250  buf = frame->buf[0]->data;
251  }
252 
253  if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
254  avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
255  buf += buf_size - context->frame_size;
256 
257  len = context->frame_size - (avctx->pix_fmt==AV_PIX_FMT_PAL8 ? AVPALETTE_SIZE : 0);
258  if (buf_size < len && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0)) {
259  av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < expected frame_size %d\n", buf_size, len);
260  av_buffer_unref(&frame->buf[0]);
261  return AVERROR(EINVAL);
262  }
263 
264  if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,
265  avctx->width, avctx->height)) < 0) {
266  av_buffer_unref(&frame->buf[0]);
267  return res;
268  }
269 
270  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
272  NULL);
273 
274  if (pal) {
275  av_buffer_unref(&context->palette);
277  if (!context->palette) {
278  av_buffer_unref(&frame->buf[0]);
279  return AVERROR(ENOMEM);
280  }
281  memcpy(context->palette->data, pal, AVPALETTE_SIZE);
282  frame->palette_has_changed = 1;
283  }
284  }
285 
286  if ((avctx->pix_fmt==AV_PIX_FMT_BGR24 ||
287  avctx->pix_fmt==AV_PIX_FMT_GRAY8 ||
288  avctx->pix_fmt==AV_PIX_FMT_RGB555LE ||
289  avctx->pix_fmt==AV_PIX_FMT_RGB555BE ||
290  avctx->pix_fmt==AV_PIX_FMT_RGB565LE ||
291  avctx->pix_fmt==AV_PIX_FMT_MONOWHITE ||
292  avctx->pix_fmt==AV_PIX_FMT_PAL8) &&
293  FFALIGN(frame->linesize[0], linesize_align) * avctx->height <= buf_size)
294  frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align);
295 
296  if (avctx->pix_fmt == AV_PIX_FMT_NV12 && avctx->codec_tag == MKTAG('N', 'V', '1', '2') &&
297  FFALIGN(frame->linesize[0], linesize_align) * avctx->height +
298  FFALIGN(frame->linesize[1], linesize_align) * ((avctx->height + 1) / 2) <= buf_size) {
299  int la0 = FFALIGN(frame->linesize[0], linesize_align);
300  frame->data[1] += (la0 - frame->linesize[0]) * avctx->height;
301  frame->linesize[0] = la0;
302  frame->linesize[1] = FFALIGN(frame->linesize[1], linesize_align);
303  }
304 
305  if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->frame_size) ||
306  (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) {
307  frame->buf[1] = av_buffer_ref(context->palette);
308  if (!frame->buf[1]) {
309  av_buffer_unref(&frame->buf[0]);
310  return AVERROR(ENOMEM);
311  }
312  frame->data[1] = frame->buf[1]->data;
313  }
314 
315  if (avctx->pix_fmt == AV_PIX_FMT_BGR24 &&
316  ((frame->linesize[0] + 3) & ~3) * avctx->height <= buf_size)
317  frame->linesize[0] = (frame->linesize[0] + 3) & ~3;
318 
319  if (context->flip)
320  flip(avctx, picture);
321 
322  if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2') ||
323  avctx->codec_tag == MKTAG('Y', 'V', '1', '6') ||
324  avctx->codec_tag == MKTAG('Y', 'V', '2', '4') ||
325  avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
326  FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
327 
328  if (avctx->codec_tag == AV_RL32("I420") && (avctx->width+1)*(avctx->height+1) * 3/2 == buf_size) {
329  picture->data[1] = picture->data[1] + (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height;
330  picture->data[2] = picture->data[2] + ((avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height)*5/4;
331  }
332 
333  if (avctx->codec_tag == AV_RL32("yuv2") &&
334  avctx->pix_fmt == AV_PIX_FMT_YUYV422) {
335  int x, y;
336  uint8_t *line = picture->data[0];
337  for (y = 0; y < avctx->height; y++) {
338  for (x = 0; x < avctx->width; x++)
339  line[2 * x + 1] ^= 0x80;
340  line += picture->linesize[0];
341  }
342  }
343 
344  if (avctx->field_order > AV_FIELD_PROGRESSIVE) { /* we have interlaced material flagged in container */
345  frame->interlaced_frame = 1;
346  if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
347  frame->top_field_first = 1;
348  }
349 
350  *got_frame = 1;
351  return buf_size;
352 }
353 
355 {
356  RawVideoContext *context = avctx->priv_data;
357 
358  av_buffer_unref(&context->palette);
359  return 0;
360 }
361 
363  .name = "rawvideo",
364  .long_name = NULL_IF_CONFIG_SMALL("raw video"),
365  .type = AVMEDIA_TYPE_VIDEO,
366  .id = AV_CODEC_ID_RAWVIDEO,
367  .priv_data_size = sizeof(RawVideoContext),
370  .decode = raw_decode,
371  .priv_class = &rawdec_class,
372  .capabilities = CODEC_CAP_PARAM_CHANGE,
373 };