FFmpeg
mvcdec.c
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1 /*
2  * Silicon Graphics Motion Video Compressor 1 & 2 decoder
3  * Copyright (c) 2012 Peter Ross
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  * Silicon Graphics Motion Video Compressor 1 & 2 decoder
25  */
26 
27 #include "libavutil/intreadwrite.h"
28 
29 #include "avcodec.h"
30 #include "bytestream.h"
31 #include "internal.h"
32 
33 typedef struct MvcContext {
34  int vflip;
35 } MvcContext;
36 
38 {
39  MvcContext *s = avctx->priv_data;
40  int width = avctx->width;
41  int height = avctx->height;
42  int ret;
43 
44  if (avctx->codec_id == AV_CODEC_ID_MVC1) {
45  width += 3;
46  height += 3;
47  }
48  width &= ~3;
49  height &= ~3;
50  if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
51  return ret;
52 
53  avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555
55  s->vflip = avctx->extradata_size >= 9 &&
56  !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9);
57  return 0;
58 }
59 
60 static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb,
61  uint8_t *dst_start, int width, int height, int linesize)
62 {
63  uint8_t *dst;
64  uint16_t v[8];
65  int mask, x, y, i;
66 
67  for (y = 0; y < height; y += 4) {
68  for (x = 0; x < width; x += 4) {
69  if (bytestream2_get_bytes_left(gb) < 6)
70  return 0;
71 
72  mask = bytestream2_get_be16u(gb);
73  v[0] = bytestream2_get_be16u(gb);
74  v[1] = bytestream2_get_be16u(gb);
75  if ((v[0] & 0x8000)) {
76  if (bytestream2_get_bytes_left(gb) < 12) {
77  av_log(avctx, AV_LOG_WARNING, "buffer overflow\n");
78  return AVERROR_INVALIDDATA;
79  }
80  for (i = 2; i < 8; i++)
81  v[i] = bytestream2_get_be16u(gb);
82  } else {
83  v[2] = v[4] = v[6] = v[0];
84  v[3] = v[5] = v[7] = v[1];
85  }
86 
87 #define PIX16(target, true, false) \
88  i = (mask & target) ? true : false; \
89  AV_WN16A(dst, v[i] & 0x7FFF); \
90  dst += 2;
91 
92 #define ROW16(row, a1, a0, b1, b0) \
93  dst = dst_start + (y + row) * linesize + x * 2; \
94  PIX16(1 << (row * 4), a1, a0) \
95  PIX16(1 << (row * 4 + 1), a1, a0) \
96  PIX16(1 << (row * 4 + 2), b1, b0) \
97  PIX16(1 << (row * 4 + 3), b1, b0)
98 
99  ROW16(0, 0, 1, 2, 3);
100  ROW16(1, 0, 1, 2, 3);
101  ROW16(2, 4, 5, 6, 7);
102  ROW16(3, 4, 5, 6, 7);
103  }
104  }
105  return 0;
106 }
107 
108 static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel)
109 {
110  int i, j;
111  for (j = 0; j < 4; j++)
112  for (i = 0; i < 4; i++)
113  AV_WN32A(dst + j * linesize + i * 4, pixel);
114 }
115 
116 #define PIX32(target, true, false) \
117  AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \
118  dst += 4;
119 
120 #define ROW32(row, a1, a0, b1, b0) \
121  dst = dst_start + (y + row) * linesize + x * 4; \
122  PIX32(1 << (row * 4), a1, a0) \
123  PIX32(1 << (row * 4 + 1), a1, a0) \
124  PIX32(1 << (row * 4 + 2), b1, b0) \
125  PIX32(1 << (row * 4 + 3), b1, b0)
126 
127 #define MVC2_BLOCK \
128  ROW32(0, 1, 0, 3, 2); \
129  ROW32(1, 1, 0, 3, 2); \
130  ROW32(2, 5, 4, 7, 6); \
131  ROW32(3, 5, 4, 7, 6);
132 
134  uint8_t *dst_start, int width, int height,
135  int linesize, int vflip)
136 {
137  uint8_t *dst;
138  uint32_t color[128], v[8];
139  int w, h, nb_colors, i, x, y, p0, p1, mask;
140 
141  if (bytestream2_get_bytes_left(gb) < 6)
142  return AVERROR_INVALIDDATA;
143 
144  w = bytestream2_get_be16u(gb);
145  h = bytestream2_get_be16u(gb);
146  if ((w & ~3) != width || (h & ~3) != height)
147  av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n");
148 
149  if (bytestream2_get_byteu(gb)) {
150  avpriv_request_sample(avctx, "bitmap feature");
151  return AVERROR_PATCHWELCOME;
152  }
153 
154  nb_colors = bytestream2_get_byteu(gb);
155  if (bytestream2_get_bytes_left(gb) < nb_colors * 3)
156  return AVERROR_INVALIDDATA;
157  for (i = 0; i < FFMIN(nb_colors, 128); i++)
158  color[i] = 0xFF000000 | bytestream2_get_be24u(gb);
159  if (nb_colors > 128)
160  bytestream2_skip(gb, (nb_colors - 128) * 3);
161 
162  if (vflip) {
163  dst_start += (height - 1) * linesize;
164  linesize = -linesize;
165  }
166  x = y = 0;
167  while (bytestream2_get_bytes_left(gb) >= 1) {
168  p0 = bytestream2_get_byteu(gb);
169  if ((p0 & 0x80)) {
170  if ((p0 & 0x40)) {
171  p0 &= 0x3F;
172  p0 = (p0 << 2) | (p0 >> 4);
173  set_4x4_block(dst_start + y * linesize + x * 4, linesize,
174  0xFF000000 | (p0 << 16) | (p0 << 8) | p0);
175  } else {
176  int g, r;
177  p0 &= 0x3F;
178  p0 = (p0 << 2) | (p0 >> 4);
179  if (bytestream2_get_bytes_left(gb) < 2)
180  return AVERROR_INVALIDDATA;
181  g = bytestream2_get_byteu(gb);
182  r = bytestream2_get_byteu(gb);
183  set_4x4_block(dst_start + y * linesize + x * 4, linesize,
184  0xFF000000 | (r << 16) | (g << 8) | p0);
185  }
186  } else {
187  if (bytestream2_get_bytes_left(gb) < 1)
188  return AVERROR_INVALIDDATA;
189  p1 = bytestream2_get_byteu(gb);
190  if ((p1 & 0x80)) {
191  if ((p0 & 0x7F) == (p1 & 0x7F)) {
192  set_4x4_block(dst_start + y * linesize + x * 4, linesize,
193  color[p0 & 0x7F]);
194  } else {
195  if (bytestream2_get_bytes_left(gb) < 2)
196  return AVERROR_INVALIDDATA;
197  v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F];
198  v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F];
199  mask = bytestream2_get_le16u(gb);
200  MVC2_BLOCK
201  }
202  } else {
203  if (bytestream2_get_bytes_left(gb) < 8)
204  return AVERROR_INVALIDDATA;
205  v[0] = color[p0 & 0x7F];
206  v[1] = color[p1 & 0x7F];
207  for (i = 2; i < 8; i++)
208  v[i] = color[bytestream2_get_byteu(gb) & 0x7F];
209  mask = bytestream2_get_le16u(gb);
210  MVC2_BLOCK
211  }
212  }
213 
214  x += 4;
215  if (x >= width) {
216  y += 4;
217  if (y >= height)
218  break;
219  x = 0;
220  }
221  }
222  return 0;
223 }
224 
225 static int mvc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
226  AVPacket *avpkt)
227 {
228  MvcContext *s = avctx->priv_data;
229  AVFrame *frame = data;
230  GetByteContext gb;
231  int ret;
232 
233  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
234  return ret;
235 
236  bytestream2_init(&gb, avpkt->data, avpkt->size);
237  if (avctx->codec_id == AV_CODEC_ID_MVC1)
238  ret = decode_mvc1(avctx, &gb, frame->data[0],
239  avctx->width, avctx->height, frame->linesize[0]);
240  else
241  ret = decode_mvc2(avctx, &gb, frame->data[0],
242  avctx->width, avctx->height, frame->linesize[0],
243  s->vflip);
244  if (ret < 0)
245  return ret;
246 
247  frame->pict_type = AV_PICTURE_TYPE_I;
248  frame->key_frame = 1;
249 
250  *got_frame = 1;
251 
252  return avpkt->size;
253 }
254 
255 #if CONFIG_MVC1_DECODER
257  .name = "mvc1",
258  .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"),
259  .type = AVMEDIA_TYPE_VIDEO,
260  .id = AV_CODEC_ID_MVC1,
261  .priv_data_size = sizeof(MvcContext),
264  .capabilities = AV_CODEC_CAP_DR1,
265 };
266 #endif
267 
268 #if CONFIG_MVC2_DECODER
270  .name = "mvc2",
271  .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"),
272  .type = AVMEDIA_TYPE_VIDEO,
273  .id = AV_CODEC_ID_MVC2,
274  .priv_data_size = sizeof(MvcContext),
277  .capabilities = AV_CODEC_CAP_DR1,
278 };
279 #endif
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel)
Definition: mvcdec.c:108
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:104
const char * g
Definition: vf_curves.c:115
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define avpriv_request_sample(...)
int size
Definition: avcodec.h:1481
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1778
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
#define MVC2_BLOCK
Definition: mvcdec.c:127
AVCodec.
Definition: avcodec.h:3492
#define AV_WN32A(p, v)
Definition: intreadwrite.h:538
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
uint8_t
#define av_cold
Definition: attributes.h:82
#define ROW16(row, a1, a0, b1, b0)
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1669
static int mvc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mvcdec.c:225
#define height
uint8_t * data
Definition: avcodec.h:1480
#define av_log(a,...)
AVCodec ff_mvc1_decoder
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
static const uint16_t mask[17]
Definition: lzw.c:38
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const char * r
Definition: vf_curves.c:114
static av_cold int mvc_decode_init(AVCodecContext *avctx)
Definition: mvcdec.c:37
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
const char * name
Name of the codec implementation.
Definition: avcodec.h:3499
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:378
#define FFMIN(a, b)
Definition: common.h:96
#define width
int width
picture width / height.
Definition: avcodec.h:1741
uint8_t w
Definition: llviddspenc.c:38
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define s(width, name)
Definition: cbs_vp9.c:257
static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize, int vflip)
Definition: mvcdec.c:133
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
Libavcodec external API header.
enum AVCodecID codec_id
Definition: avcodec.h:1578
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
main external API structure.
Definition: avcodec.h:1568
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:360
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1968
int extradata_size
Definition: avcodec.h:1670
uint8_t pixel
Definition: tiny_ssim.c:42
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
common internal api header.
int vflip
Definition: mvcdec.c:34
static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize)
Definition: mvcdec.c:60
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:375
void * priv_data
Definition: avcodec.h:1595
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:373
AVCodec ff_mvc2_decoder
This structure stores compressed data.
Definition: avcodec.h:1457
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:984