FFmpeg
arbc.c
Go to the documentation of this file.
1 /*
2  * Gryphon's Anim Compressor decoder
3  * Copyright (c) 2019 Paul B Mahol
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 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 
26 #include "libavutil/imgutils.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/mem.h"
30 
31 #include "avcodec.h"
32 #include "bytestream.h"
33 #include "internal.h"
34 
35 typedef struct ARBCContext {
37 
39 } ARBCContext;
40 
41 static int fill_tile4(AVCodecContext *avctx, int color, AVFrame *frame)
42 {
43  ARBCContext *s = avctx->priv_data;
44  GetByteContext *gb = &s->gb;
45  int nb_tiles = bytestream2_get_le16(gb);
46  int h = avctx->height - 1;
47  int pixels_overwritten = 0;
48 
49  if ((avctx->width / 4 + 1) * (avctx->height / 4 + 1) < nb_tiles)
50  return 0;
51 
52  for (int i = 0; i < nb_tiles; i++) {
53  int y = bytestream2_get_byte(gb);
54  int x = bytestream2_get_byte(gb);
55  uint16_t mask = bytestream2_get_le16(gb);
56  int start_y = y * 4, start_x = x * 4;
57  int end_y = start_y + 4, end_x = start_x + 4;
58 
59  for (int j = start_y; j < end_y; j++) {
60  for (int k = start_x; k < end_x; k++) {
61  if (mask & 0x8000) {
62  if (j >= avctx->height || k >= avctx->width) {
63  mask = mask << 1;
64  continue;
65  }
66  AV_WB24(&frame->data[0][frame->linesize[0] * (h - j) + 3 * k], color);
67  pixels_overwritten ++;
68  }
69  mask = mask << 1;
70  }
71  }
72  }
73  return pixels_overwritten;
74 }
75 
76 static int fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height,
77  int color, AVFrame *frame)
78 {
79  ARBCContext *s = avctx->priv_data;
80  GetByteContext *gb = &s->gb;
81  const int step_h = tile_height / 4;
82  const int step_w = tile_width / 4;
83  int nb_tiles = bytestream2_get_le16(gb);
84  int h = avctx->height - 1;
85  int pixels_overwritten = 0;
86 
87  if ((avctx->width / tile_width + 1) * (avctx->height / tile_height + 1) < nb_tiles)
88  return 0;
89 
90  for (int i = 0; i < nb_tiles; i++) {
91  int y = bytestream2_get_byte(gb);
92  int x = bytestream2_get_byte(gb);
93  uint16_t mask = bytestream2_get_le16(gb);
94  int start_y = y * tile_height, start_x = x * tile_width;
95  int end_y = start_y + tile_height, end_x = start_x + tile_width;
96 
97  if (start_x >= avctx->width || start_y >= avctx->height)
98  continue;
99 
100  for (int j = start_y; j < end_y; j += step_h) {
101  for (int k = start_x; k < end_x; k += step_w) {
102  if (mask & 0x8000U) {
103  for (int m = 0; m < step_h; m++) {
104  for (int n = 0; n < step_w; n++) {
105  if (j + m >= avctx->height || k + n >= avctx->width)
106  continue;
107  AV_WB24(&frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n)], color);
108  }
109  }
110  pixels_overwritten += FFMIN(step_h, avctx->height - j) * FFMIN(step_w, avctx->width - k);
111  }
112  mask = mask << 1;
113  }
114  }
115  }
116  return pixels_overwritten;
117 }
118 
119 static int decode_frame(AVCodecContext *avctx, void *data,
120  int *got_frame, AVPacket *avpkt)
121 {
122  ARBCContext *s = avctx->priv_data;
123  AVFrame *frame = data;
124  int ret, nb_segments;
125  int prev_pixels = avctx->width * avctx->height;
126 
127  if (avpkt->size < 10)
128  return AVERROR_INVALIDDATA;
129 
130  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
131  bytestream2_skip(&s->gb, 8);
132  nb_segments = bytestream2_get_le16(&s->gb);
133  if (nb_segments == 0)
134  return avpkt->size;
135 
136  if (7 * nb_segments > bytestream2_get_bytes_left(&s->gb))
137  return AVERROR_INVALIDDATA;
138 
139  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
140  return ret;
141 
142  if (s->prev_frame->data[0]) {
143  ret = av_frame_copy(frame, s->prev_frame);
144  if (ret < 0)
145  return ret;
146  }
147 
148  for (int i = 0; i < nb_segments; i++) {
149  int resolution_flag;
150  int fill;
151 
152  if (bytestream2_get_bytes_left(&s->gb) <= 0)
153  return AVERROR_INVALIDDATA;
154 
155  fill = bytestream2_get_byte(&s->gb) << 16;
156  bytestream2_skip(&s->gb, 1);
157  fill |= bytestream2_get_byte(&s->gb) << 8;
158  bytestream2_skip(&s->gb, 1);
159  fill |= bytestream2_get_byte(&s->gb) << 0;
160  bytestream2_skip(&s->gb, 1);
161  resolution_flag = bytestream2_get_byte(&s->gb);
162 
163  if (resolution_flag & 0x10)
164  prev_pixels -= fill_tileX(avctx, 1024, 1024, fill, frame);
165  if (resolution_flag & 0x08)
166  prev_pixels -= fill_tileX(avctx, 256, 256, fill, frame);
167  if (resolution_flag & 0x04)
168  prev_pixels -= fill_tileX(avctx, 64, 64, fill, frame);
169  if (resolution_flag & 0x02)
170  prev_pixels -= fill_tileX(avctx, 16, 16, fill, frame);
171  if (resolution_flag & 0x01)
172  prev_pixels -= fill_tile4(avctx, fill, frame);
173  }
174 
176  if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
177  return ret;
178 
179  frame->pict_type = prev_pixels <= 0 ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
180  frame->key_frame = prev_pixels <= 0;
181  *got_frame = 1;
182 
183  return avpkt->size;
184 }
185 
187 {
188  ARBCContext *s = avctx->priv_data;
189 
190  avctx->pix_fmt = AV_PIX_FMT_RGB24;
191 
192  s->prev_frame = av_frame_alloc();
193  if (!s->prev_frame)
194  return AVERROR(ENOMEM);
195 
196  return 0;
197 }
198 
199 static void decode_flush(AVCodecContext *avctx)
200 {
201  ARBCContext *s = avctx->priv_data;
202 
204 }
205 
207 {
208  ARBCContext *s = avctx->priv_data;
209 
211 
212  return 0;
213 }
214 
216  .name = "arbc",
217  .long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"),
218  .type = AVMEDIA_TYPE_VIDEO,
219  .id = AV_CODEC_ID_ARBC,
220  .priv_data_size = sizeof(ARBCContext),
221  .init = decode_init,
222  .decode = decode_frame,
223  .flush = decode_flush,
224  .close = decode_close,
225  .capabilities = AV_CODEC_CAP_DR1,
226  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
227 };
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:48
#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
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static void flush(AVCodecContext *avctx)
misc image utilities
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
Memory handling functions.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
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
AVCodec.
Definition: avcodec.h:3492
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
#define av_cold
Definition: attributes.h:82
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:189
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:443
uint8_t * data
Definition: avcodec.h:1480
static void decode_flush(AVCodecContext *avctx)
Definition: arbc.c:199
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
static int fill_tile4(AVCodecContext *avctx, int color, AVFrame *frame)
Definition: arbc.c:41
AVCodec ff_arbc_decoder
Definition: arbc.c:215
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
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
static int fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height, int color, AVFrame *frame)
Definition: arbc.c:76
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
GetByteContext gb
Definition: arbc.c:36
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
int av_frame_copy(AVFrame *dst, const AVFrame *src)
Copy the frame data from src to dst.
Definition: frame.c:792
common internal API header
static av_cold int decode_close(AVCodecContext *avctx)
Definition: arbc.c:206
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:378
#define FFMIN(a, b)
Definition: common.h:96
int width
picture width / height.
Definition: avcodec.h:1741
#define AV_WB24(p, d)
Definition: intreadwrite.h:450
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
int n
Definition: avisynth_c.h:760
Libavcodec external API header.
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
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1968
static av_cold int decode_init(AVCodecContext *avctx)
Definition: arbc.c:186
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:553
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
common internal api header.
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: arbc.c:119
void * priv_data
Definition: avcodec.h:1595
AVFrame * prev_frame
Definition: arbc.c:38
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:373
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
This structure stores compressed data.
Definition: avcodec.h:1457
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:1179
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:984
Predicted.
Definition: avutil.h:275