rawdec.c
Go to the documentation of this file.
1 /*
2  * Raw Video Decoder
3  * Copyright (c) 2001 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
27 #include "avcodec.h"
28 #include "imgconvert.h"
29 #include "raw.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/imgutils.h"
32 
33 typedef struct RawVideoContext {
35  unsigned char * buffer; /* block of memory for holding one frame */
36  int length; /* number of bytes in buffer */
37  int flip;
40 
41 static const PixelFormatTag pix_fmt_bps_avi[] = {
42  { PIX_FMT_PAL8, 4 },
43  { PIX_FMT_PAL8, 8 },
44  { PIX_FMT_RGB444, 12 },
45  { PIX_FMT_RGB555, 15 },
46  { PIX_FMT_RGB555, 16 },
47  { PIX_FMT_BGR24, 24 },
48  { PIX_FMT_RGB32, 32 },
49  { PIX_FMT_NONE, 0 },
50 };
51 
52 static const PixelFormatTag pix_fmt_bps_mov[] = {
53  { PIX_FMT_MONOWHITE, 1 },
54  { PIX_FMT_PAL8, 2 },
55  { PIX_FMT_PAL8, 4 },
56  { PIX_FMT_PAL8, 8 },
57  // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
58  // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
59  { PIX_FMT_RGB555BE, 16 },
60  { PIX_FMT_RGB24, 24 },
61  { PIX_FMT_ARGB, 32 },
62  { PIX_FMT_MONOWHITE,33 },
63  { PIX_FMT_NONE, 0 },
64 };
65 
66 static enum PixelFormat find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc)
67 {
68  while (tags->pix_fmt >= 0) {
69  if (tags->fourcc == fourcc)
70  return tags->pix_fmt;
71  tags++;
72  }
73  return PIX_FMT_YUV420P;
74 }
75 
77 {
78  RawVideoContext *context = avctx->priv_data;
79 
80  if (avctx->codec_tag == MKTAG('r','a','w',' '))
81  avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_mov, avctx->bits_per_coded_sample);
82  else if (avctx->codec_tag == MKTAG('W','R','A','W'))
83  avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
84  else if (avctx->codec_tag)
86  else if (avctx->pix_fmt == PIX_FMT_NONE && avctx->bits_per_coded_sample)
87  avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
88 
89  ff_set_systematic_pal2(context->palette, avctx->pix_fmt);
90  context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
91  if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
92  avctx->pix_fmt==PIX_FMT_PAL8 &&
93  (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
94  context->buffer = av_malloc(context->length);
95  if (!context->buffer)
96  return -1;
97  }
98  context->pic.pict_type = AV_PICTURE_TYPE_I;
99  context->pic.key_frame = 1;
100 
101  avctx->coded_frame= &context->pic;
102 
103  if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
104  avctx->codec_tag == MKTAG(3, 0, 0, 0) || avctx->codec_tag == MKTAG('W','R','A','W'))
105  context->flip=1;
106 
107  return 0;
108 }
109 
110 static void flip(AVCodecContext *avctx, AVPicture * picture){
111  picture->data[0] += picture->linesize[0] * (avctx->height-1);
112  picture->linesize[0] *= -1;
113 }
114 
115 static int raw_decode(AVCodecContext *avctx,
116  void *data, int *data_size,
117  AVPacket *avpkt)
118 {
119  const uint8_t *buf = avpkt->data;
120  int buf_size = avpkt->size;
121  RawVideoContext *context = avctx->priv_data;
122  int res;
123 
124  AVFrame * frame = (AVFrame *) data;
125  AVPicture * picture = (AVPicture *) data;
126 
127  frame->pict_type = avctx->coded_frame->pict_type;
130  frame->reordered_opaque = avctx->reordered_opaque;
131  frame->pkt_pts = avctx->pkt->pts;
132 
133  if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
134  return -1;
135 
136  //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
137  if (context->buffer) {
138  int i;
139  uint8_t *dst = context->buffer;
140  buf_size = context->length - 256*4;
141  if (avctx->bits_per_coded_sample == 4){
142  for(i=0; 2*i+1 < buf_size; i++){
143  dst[2*i+0]= buf[i]>>4;
144  dst[2*i+1]= buf[i]&15;
145  }
146  } else
147  for(i=0; 4*i+3 < buf_size; i++){
148  dst[4*i+0]= buf[i]>>6;
149  dst[4*i+1]= buf[i]>>4&3;
150  dst[4*i+2]= buf[i]>>2&3;
151  dst[4*i+3]= buf[i] &3;
152  }
153  buf= dst;
154  }
155 
156  if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
157  avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
158  buf += buf_size - context->length;
159 
160  if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,
161  avctx->width, avctx->height)) < 0)
162  return res;
163  if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) ||
164  (avctx->pix_fmt!=PIX_FMT_PAL8 &&
166  frame->data[1]= context->palette;
167  }
168  if (avctx->pix_fmt == PIX_FMT_PAL8) {
169  const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
170 
171  if (pal) {
172  memcpy(frame->data[1], pal, AVPALETTE_SIZE);
173  frame->palette_has_changed = 1;
174  }
175  }
176  if(avctx->pix_fmt==PIX_FMT_BGR24 && ((frame->linesize[0]+3)&~3)*avctx->height <= buf_size)
177  frame->linesize[0] = (frame->linesize[0]+3)&~3;
178 
179  if(context->flip)
180  flip(avctx, picture);
181 
182  if ( avctx->codec_tag == MKTAG('Y', 'V', '1', '2')
183  || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
184  FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
185 
186  if(avctx->codec_tag == AV_RL32("yuv2") &&
187  avctx->pix_fmt == PIX_FMT_YUYV422) {
188  int x, y;
189  uint8_t *line = picture->data[0];
190  for(y = 0; y < avctx->height; y++) {
191  for(x = 0; x < avctx->width; x++)
192  line[2*x + 1] ^= 0x80;
193  line += picture->linesize[0];
194  }
195  }
196 
197  *data_size = sizeof(AVPicture);
198  return buf_size;
199 }
200 
202 {
203  RawVideoContext *context = avctx->priv_data;
204 
205  av_freep(&context->buffer);
206  return 0;
207 }
208 
210  .name = "rawvideo",
211  .type = AVMEDIA_TYPE_VIDEO,
212  .id = CODEC_ID_RAWVIDEO,
213  .priv_data_size = sizeof(RawVideoContext),
216  .decode = raw_decode,
217  .long_name = NULL_IF_CONFIG_SMALL("raw video"),
218 };