FFmpeg
jvdec.c
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1 /*
2  * Bitmap Brothers JV video decoder
3  * Copyright (c) 2011 Peter Ross <pross@xvid.org>
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  * Bitmap Brothers JV video decoder
25  * @author Peter Ross <pross@xvid.org>
26  */
27 
28 #include "libavutil/intreadwrite.h"
29 
30 #include "avcodec.h"
31 #include "blockdsp.h"
32 #include "get_bits.h"
33 #include "internal.h"
34 
35 typedef struct JvContext {
40 } JvContext;
41 
43 {
44  JvContext *s = avctx->priv_data;
45 
46  if (!avctx->width || !avctx->height ||
47  (avctx->width & 7) || (avctx->height & 7)) {
48  av_log(avctx, AV_LOG_ERROR, "Invalid video dimensions: %dx%d\n",
49  avctx->width, avctx->height);
50  return AVERROR(EINVAL);
51  }
52 
53  s->frame = av_frame_alloc();
54  if (!s->frame)
55  return AVERROR(ENOMEM);
56 
57  avctx->pix_fmt = AV_PIX_FMT_PAL8;
58  ff_blockdsp_init(&s->bdsp, avctx);
59  return 0;
60 }
61 
62 /**
63  * Decode 2x2 block
64  */
65 static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
66 {
67  int i, j, v[2];
68 
69  switch (get_bits(gb, 2)) {
70  case 1:
71  v[0] = get_bits(gb, 8);
72  for (j = 0; j < 2; j++)
73  memset(dst + j * linesize, v[0], 2);
74  break;
75  case 2:
76  v[0] = get_bits(gb, 8);
77  v[1] = get_bits(gb, 8);
78  for (j = 0; j < 2; j++)
79  for (i = 0; i < 2; i++)
80  dst[j * linesize + i] = v[get_bits1(gb)];
81  break;
82  case 3:
83  for (j = 0; j < 2; j++)
84  for (i = 0; i < 2; i++)
85  dst[j * linesize + i] = get_bits(gb, 8);
86  }
87 }
88 
89 /**
90  * Decode 4x4 block
91  */
92 static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
93 {
94  int i, j, v[2];
95 
96  switch (get_bits(gb, 2)) {
97  case 1:
98  v[0] = get_bits(gb, 8);
99  for (j = 0; j < 4; j++)
100  memset(dst + j * linesize, v[0], 4);
101  break;
102  case 2:
103  v[0] = get_bits(gb, 8);
104  v[1] = get_bits(gb, 8);
105  for (j = 2; j >= 0; j -= 2) {
106  for (i = 0; i < 4; i++)
107  dst[j * linesize + i] = v[get_bits1(gb)];
108  for (i = 0; i < 4; i++)
109  dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
110  }
111  break;
112  case 3:
113  for (j = 0; j < 4; j += 2)
114  for (i = 0; i < 4; i += 2)
115  decode2x2(gb, dst + j * linesize + i, linesize);
116  }
117 }
118 
119 /**
120  * Decode 8x8 block
121  */
122 static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
123  BlockDSPContext *bdsp)
124 {
125  int i, j, v[2];
126 
127  switch (get_bits(gb, 2)) {
128  case 1:
129  v[0] = get_bits(gb, 8);
130  bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
131  break;
132  case 2:
133  v[0] = get_bits(gb, 8);
134  v[1] = get_bits(gb, 8);
135  for (j = 7; j >= 0; j--)
136  for (i = 0; i < 8; i++)
137  dst[j * linesize + i] = v[get_bits1(gb)];
138  break;
139  case 3:
140  for (j = 0; j < 8; j += 4)
141  for (i = 0; i < 8; i += 4)
142  decode4x4(gb, dst + j * linesize + i, linesize);
143  }
144 }
145 
146 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
147  AVPacket *avpkt)
148 {
149  JvContext *s = avctx->priv_data;
150  const uint8_t *buf = avpkt->data;
151  const uint8_t *buf_end = buf + avpkt->size;
152  int video_size, video_type, i, j, ret;
153 
154  if (avpkt->size < 6)
155  return AVERROR_INVALIDDATA;
156 
157  video_size = AV_RL32(buf);
158  video_type = buf[4];
159  buf += 5;
160 
161  if (video_size) {
162  if (video_size < 0 || video_size > avpkt->size - 5) {
163  av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
164  return AVERROR_INVALIDDATA;
165  }
166 
167  if (video_type == 0 || video_type == 1) {
168  GetBitContext gb;
169  init_get_bits(&gb, buf, 8 * video_size);
170 
171  if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
172  return ret;
173 
174  if (avctx->height/8 * (avctx->width/8) > 4 * video_size) {
175  av_log(avctx, AV_LOG_ERROR, "Insufficient input data for dimensions\n");
176  return AVERROR_INVALIDDATA;
177  }
178 
179  for (j = 0; j < avctx->height; j += 8)
180  for (i = 0; i < avctx->width; i += 8)
181  decode8x8(&gb,
182  s->frame->data[0] + j * s->frame->linesize[0] + i,
183  s->frame->linesize[0], &s->bdsp);
184 
185  buf += video_size;
186  } else if (video_type == 2) {
187  int v = *buf++;
188 
189  av_frame_unref(s->frame);
190  if ((ret = ff_get_buffer(avctx, s->frame, AV_GET_BUFFER_FLAG_REF)) < 0)
191  return ret;
192 
193  for (j = 0; j < avctx->height; j++)
194  memset(s->frame->data[0] + j * s->frame->linesize[0],
195  v, avctx->width);
196  } else {
197  av_log(avctx, AV_LOG_WARNING,
198  "unsupported frame type %i\n", video_type);
199  return AVERROR_INVALIDDATA;
200  }
201  }
202 
203  if (buf_end - buf >= AVPALETTE_COUNT * 3) {
204  for (i = 0; i < AVPALETTE_COUNT; i++) {
205  uint32_t pal = AV_RB24(buf);
206  s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
207  buf += 3;
208  }
209  s->palette_has_changed = 1;
210  }
211 
212  if (video_size) {
213  s->frame->key_frame = 1;
214  s->frame->pict_type = AV_PICTURE_TYPE_I;
215  s->frame->palette_has_changed = s->palette_has_changed;
216  s->palette_has_changed = 0;
217  memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
218 
219  if ((ret = av_frame_ref(data, s->frame)) < 0)
220  return ret;
221  *got_frame = 1;
222  }
223 
224  return avpkt->size;
225 }
226 
228 {
229  JvContext *s = avctx->priv_data;
230 
231  av_frame_free(&s->frame);
232 
233  return 0;
234 }
235 
237  .name = "jv",
238  .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
239  .type = AVMEDIA_TYPE_VIDEO,
240  .id = AV_CODEC_ID_JV,
241  .priv_data_size = sizeof(JvContext),
242  .init = decode_init,
243  .close = decode_close,
244  .decode = decode_frame,
245  .capabilities = AV_CODEC_CAP_DR1,
246  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
247 };
AVCodec
AVCodec.
Definition: codec.h:197
BlockDSPContext::fill_block_tab
op_fill_func fill_block_tab[2]
Definition: blockdsp.h:39
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:187
FF_CODEC_CAP_INIT_THREADSAFE
#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:41
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
blockdsp.h
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:111
decode2x2
static void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
Decode 2x2 block.
Definition: jvdec.c:65
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
data
const char data[16]
Definition: mxf.c:142
BlockDSPContext
Definition: blockdsp.h:35
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
U
#define U(x)
Definition: vp56_arith.h:37
GetBitContext
Definition: get_bits.h:61
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:98
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
av_cold
#define av_cold
Definition: attributes.h:90
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_GET_BUFFER_FLAG_REF
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:479
get_bits.h
JvContext::bdsp
BlockDSPContext bdsp
Definition: jvdec.c:36
AVPALETTE_SIZE
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
AVPALETTE_COUNT
#define AVPALETTE_COUNT
Definition: pixfmt.h:33
ff_jv_decoder
const AVCodec ff_jv_decoder
Definition: jvdec.c:236
decode_frame
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: jvdec.c:146
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1638
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:366
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
av_frame_ref
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:326
JvContext::palette_has_changed
int palette_has_changed
Definition: jvdec.c:39
decode_close
static av_cold int decode_close(AVCodecContext *avctx)
Definition: jvdec.c:227
i
int i
Definition: input.c:407
JvContext::palette
uint32_t palette[AVPALETTE_COUNT]
Definition: jvdec.c:38
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:436
JvContext::frame
AVFrame * frame
Definition: jvdec.c:37
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
JvContext
Definition: jvdec.c:35
AVCodecContext::height
int height
Definition: avcodec.h:674
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:711
avcodec.h
AV_PIX_FMT_PAL8
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
ff_reget_buffer
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
Definition: decode.c:1745
ret
ret
Definition: filter_design.txt:187
AV_CODEC_ID_JV
@ AV_CODEC_ID_JV
Definition: codec_id.h:198
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVCodecContext
main external API structure.
Definition: avcodec.h:501
decode8x8
static void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, BlockDSPContext *bdsp)
Decode 8x8 block.
Definition: jvdec.c:122
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: jvdec.c:42
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:528
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:674
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
decode4x4
static void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
Decode 4x4 block.
Definition: jvdec.c:92
ff_blockdsp_init
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:60
AV_RB24
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:97