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truemotion2rt.c
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1 /*
2  * Duck TrueMotion 2.0 Real Time decoder
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 
25 #include "libavutil/imgutils.h"
26 #include "libavutil/internal.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/mem.h"
29 
30 #define BITSTREAM_READER_LE
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "internal.h"
34 
35 typedef struct TrueMotion2RTContext {
38  int hscale;
40 
41 static const int16_t delta_tab2[] = {
42  5, -7, 36, -36,
43 };
44 
45 static const int16_t delta_tab3[] = {
46  2, -3, 8, -8, 18, -18, 36, -36,
47 };
48 
49 static const int16_t delta_tab4[] = {
50  1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144,
51 };
52 
53 static const int16_t *const delta_tabs[] = {
55 };
56 
57 /* Returns the number of bytes consumed from the bytestream, or
58  * AVERROR_INVALIDDATA if there was an error while decoding the header. */
59 static int truemotion2rt_decode_header(AVCodecContext *avctx, const AVPacket *avpkt)
60 {
62  int header_size;
63  uint8_t header_buffer[128] = { 0 }; /* logical maximum header size */
64  const uint8_t *buf = avpkt->data;
65  int size = avpkt->size;
66  int width, height;
67  int ret, i;
68 
69  if (size < 1) {
70  av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
71  return AVERROR_INVALIDDATA;
72  }
73 
74  header_size = ((buf[0] >> 5) | (buf[0] << 3)) & 0x7f;
75  if (header_size < 10) {
76  av_log(avctx, AV_LOG_ERROR, "invalid header size (%d)\n", header_size);
77  return AVERROR_INVALIDDATA;
78  }
79 
80  if (header_size + 1 > size) {
81  av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
82  return AVERROR_INVALIDDATA;
83  }
84 
85  /* unscramble the header bytes with a XOR operation */
86  for (i = 1; i < header_size; i++)
87  header_buffer[i - 1] = buf[i] ^ buf[i + 1];
88 
89  s->delta_size = header_buffer[1];
90  s->hscale = 1 + !!header_buffer[3];
91  if (s->delta_size < 2 || s->delta_size > 4)
92  return AVERROR_INVALIDDATA;
93 
94  height = AV_RL16(header_buffer + 5);
95  width = AV_RL16(header_buffer + 7);
96 
97  ret = ff_set_dimensions(avctx, width, height);
98  if (ret < 0)
99  return ret;
100 
101  av_log(avctx, AV_LOG_DEBUG, "Header size: %d\n", header_size);
102  return header_size;
103 }
104 
106  int *got_frame, AVPacket *avpkt)
107 {
108  TrueMotion2RTContext *s = avctx->priv_data;
109  AVFrame * const p = data;
110  GetBitContext *gb = &s->gb;
111  uint8_t *dst;
112  int x, y, delta_mode;
113  int ret;
114 
115  ret = truemotion2rt_decode_header(avctx, avpkt);
116  if (ret < 0)
117  return ret;
118 
119  if (avctx->width / s->hscale * avctx->height * s->delta_size > avpkt->size * 8LL * 4)
120  return AVERROR_INVALIDDATA;
121 
122  ret = init_get_bits8(gb, avpkt->data + ret, avpkt->size - ret);
123  if (ret < 0)
124  return ret;
125 
126  ret = ff_get_buffer(avctx, p, 0);
127  if (ret < 0)
128  return ret;
129 
130  skip_bits(gb, 32);
131  delta_mode = s->delta_size - 2;
132  dst = p->data[0];
133  for (y = 0; y < avctx->height; y++) {
134  int diff = 0;
135  for (x = 0; x < avctx->width; x += s->hscale) {
136  diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
137  dst[x] = av_clip_uint8((y ? dst[x - p->linesize[0]] : 0) + diff);
138  }
139  dst += p->linesize[0];
140  }
141 
142  if (s->hscale > 1) {
143  dst = p->data[0];
144  for (y = 0; y < avctx->height; y++) {
145  for (x = 1; x < avctx->width; x += s->hscale)
146  dst[x] = dst[x - 1];
147  dst += p->linesize[0];
148  }
149  }
150 
151  dst = p->data[0];
152  for (y = 0; y < avctx->height; y++) {
153  for (x = 0; x < avctx->width; x++)
154  dst[x] = av_clip_uint8(dst[x] + (dst[x] - 128) / 3);
155  dst += p->linesize[0];
156  }
157 
158  dst = p->data[1];
159  for (y = 0; y < avctx->height >> 2; y++) {
160  int diff = 0;
161  for (x = 0; x < avctx->width >> 2; x += s->hscale) {
162  diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
163  dst[x] = av_clip_uint8((y ? dst[x - p->linesize[1]] : 128) + diff);
164  }
165  dst += p->linesize[1];
166  }
167 
168  if (s->hscale > 1) {
169  dst = p->data[1];
170  for (y = 0; y < avctx->height >> 2; y++) {
171  for (x = 1; x < avctx->width >> 2; x += s->hscale)
172  dst[x] = dst[x - 1];
173  dst += p->linesize[1];
174  }
175  }
176 
177  dst = p->data[1];
178  for (y = 0; y < avctx->height >> 2; y++) {
179  for (x = 0; x < avctx->width >> 2; x++)
180  dst[x] += (dst[x] - 128) / 8;
181  dst += p->linesize[1];
182  }
183 
184  dst = p->data[2];
185  for (y = 0; y < avctx->height >> 2; y++) {
186  int diff = 0;
187  for (x = 0; x < avctx->width >> 2; x += s->hscale) {
188  diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
189  dst[x] = av_clip_uint8((y ? dst[x - p->linesize[2]] : 128) + diff);
190  }
191  dst += p->linesize[2];
192  }
193 
194  if (s->hscale > 1) {
195  dst = p->data[2];
196  for (y = 0; y < avctx->height >> 2; y++) {
197  for (x = 1; x < avctx->width >> 2; x += s->hscale)
198  dst[x] = dst[x - 1];
199  dst += p->linesize[2];
200  }
201  }
202 
203  dst = p->data[2];
204  for (y = 0; y < avctx->height >> 2; y++) {
205  for (x = 0; x < avctx->width >> 2; x++)
206  dst[x] += (dst[x] - 128) / 8;
207  dst += p->linesize[2];
208  }
209 
211  p->key_frame = 1;
212  *got_frame = 1;
213 
214  return avpkt->size;
215 }
216 
218 {
219  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
220  return 0;
221 }
222 
224  .name = "truemotion2rt",
225  .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0 Real Time"),
226  .type = AVMEDIA_TYPE_VIDEO,
228  .priv_data_size = sizeof(TrueMotion2RTContext),
231  .capabilities = AV_CODEC_CAP_DR1,
232  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
233 };
#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:218
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:269
Memory handling functions.
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
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1431
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1727
AVCodec.
Definition: avcodec.h:3408
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
static const int16_t *const delta_tabs[]
Definition: truemotion2rt.c:53
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
uint8_t
GetBitContext gb
Definition: truemotion2rt.c:36
#define av_cold
Definition: attributes.h:82
#define height
uint8_t * data
Definition: avcodec.h:1430
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:101
static const int16_t delta_tab2[]
Definition: truemotion2rt.c:41
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
uint16_t width
Definition: gdv.c:47
AVCodec ff_truemotion2rt_decoder
const char * name
Name of the codec implementation.
Definition: avcodec.h:3415
common internal API header
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:301
int width
picture width / height.
Definition: avcodec.h:1690
static const int16_t delta_tab4[]
Definition: truemotion2rt.c:49
#define s(width, name)
Definition: cbs_vp9.c:257
static const int16_t delta_tab3[]
Definition: truemotion2rt.c:45
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:249
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:464
main external API structure.
Definition: avcodec.h:1518
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1891
void * buf
Definition: avisynth_c.h:690
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:68
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:314
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:232
static int truemotion2rt_decode_header(AVCodecContext *avctx, const AVPacket *avpkt)
Definition: truemotion2rt.c:59
common internal api header.
void * priv_data
Definition: avcodec.h:1545
static av_always_inline int diff(const uint32_t a, const uint32_t b)
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:296
static int truemotion2rt_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
This structure stores compressed data.
Definition: avcodec.h:1407
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:959
static av_cold int truemotion2rt_decode_init(AVCodecContext *avctx)