FFmpeg
aasc.c
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1 /*
2  * Autodesk RLE Decoder
3  * Copyright (C) 2005 The FFmpeg project
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  * Autodesk RLE Video Decoder by Konstantin Shishkov
25  */
26 
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 
31 #include "avcodec.h"
32 #include "internal.h"
33 #include "msrledec.h"
34 
35 typedef struct AascContext {
39 
42 } AascContext;
43 
45 {
46  AascContext *s = avctx->priv_data;
47  uint8_t *ptr;
48  int i;
49 
50  s->avctx = avctx;
51  switch (avctx->bits_per_coded_sample) {
52  case 8:
53  avctx->pix_fmt = AV_PIX_FMT_PAL8;
54 
55  ptr = avctx->extradata;
57  for (i = 0; i < s->palette_size / 4; i++) {
58  s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);
59  ptr += 4;
60  }
61  break;
62  case 16:
64  break;
65  case 24:
66  avctx->pix_fmt = AV_PIX_FMT_BGR24;
67  break;
68  default:
69  av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample);
70  return -1;
71  }
72 
73  s->frame = av_frame_alloc();
74  if (!s->frame)
75  return AVERROR(ENOMEM);
76 
77  return 0;
78 }
79 
81  void *data, int *got_frame,
82  AVPacket *avpkt)
83 {
84  const uint8_t *buf = avpkt->data;
85  int buf_size = avpkt->size;
86  AascContext *s = avctx->priv_data;
87  int compr, i, stride, psize, ret;
88 
89  if (buf_size < 4) {
90  av_log(avctx, AV_LOG_ERROR, "frame too short\n");
91  return AVERROR_INVALIDDATA;
92  }
93 
94  if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
95  return ret;
96 
97  compr = AV_RL32(buf);
98  buf += 4;
99  buf_size -= 4;
100  psize = avctx->bits_per_coded_sample / 8;
101  switch (avctx->codec_tag) {
102  case MKTAG('A', 'A', 'S', '4'):
103  bytestream2_init(&s->gb, buf - 4, buf_size + 4);
104  ff_msrle_decode(avctx, s->frame, 8, &s->gb);
105  break;
106  case MKTAG('A', 'A', 'S', 'C'):
107  switch (compr) {
108  case 0:
109  stride = (avctx->width * psize + psize) & ~psize;
110  if (buf_size < stride * avctx->height)
111  return AVERROR_INVALIDDATA;
112  for (i = avctx->height - 1; i >= 0; i--) {
113  memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize);
114  buf += stride;
115  buf_size -= stride;
116  }
117  break;
118  case 1:
119  bytestream2_init(&s->gb, buf, buf_size);
120  ff_msrle_decode(avctx, s->frame, 8, &s->gb);
121  break;
122  default:
123  av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
124  return AVERROR_INVALIDDATA;
125  }
126  break;
127  default:
128  av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag);
129  return -1;
130  }
131 
132  if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
133  memcpy(s->frame->data[1], s->palette, s->palette_size);
134 
135  *got_frame = 1;
136  if ((ret = av_frame_ref(data, s->frame)) < 0)
137  return ret;
138 
139  /* report that the buffer was completely consumed */
140  return avpkt->size;
141 }
142 
144 {
145  AascContext *s = avctx->priv_data;
146 
147  av_frame_free(&s->frame);
148 
149  return 0;
150 }
151 
153  .name = "aasc",
154  .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
155  .type = AVMEDIA_TYPE_VIDEO,
156  .id = AV_CODEC_ID_AASC,
157  .priv_data_size = sizeof(AascContext),
159  .close = aasc_decode_end,
161  .capabilities = AV_CODEC_CAP_DR1,
162  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
163 };
#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:268
int ff_msrle_decode(AVCodecContext *avctx, AVFrame *pic, int depth, GetByteContext *gb)
Decode stream in MS RLE format into frame.
Definition: msrledec.c:249
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
packed RGB 5:5:5, 16bpp, (msb)1X 5R 5G 5B(lsb), little-endian, X=unused/undefined ...
Definition: pixfmt.h:108
int size
Definition: avcodec.h:1478
AVFrame * frame
Definition: aasc.c:38
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
AVCodec.
Definition: avcodec.h:3477
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: decode.c:2011
#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
#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
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
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 * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1666
#define height
uint8_t * data
Definition: avcodec.h:1477
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2785
#define av_log(a,...)
static av_cold int aasc_decode_end(AVCodecContext *avctx)
Definition: aasc.c:143
#define U(x)
Definition: vp56_arith.h:37
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const char * name
Name of the codec implementation.
Definition: avcodec.h:3484
GetByteContext gb
Definition: aasc.c:37
uint32_t palette[AVPALETTE_COUNT]
Definition: aasc.c:40
#define FFMIN(a, b)
Definition: common.h:96
int width
picture width / height.
Definition: avcodec.h:1738
static av_cold int aasc_decode_init(AVCodecContext *avctx)
Definition: aasc.c:44
#define s(width, name)
Definition: cbs_vp9.c:257
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
static int aasc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: aasc.c:80
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:299
main external API structure.
Definition: avcodec.h:1565
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
Definition: avcodec.h:1590
void * buf
Definition: avisynth_c.h:766
int extradata_size
Definition: avcodec.h:1667
AVCodec ff_aasc_decoder
Definition: aasc.c:152
#define AVPALETTE_COUNT
Definition: pixfmt.h:33
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:282
common internal api header.
void * priv_data
Definition: avcodec.h:1592
AVCodecContext * avctx
Definition: aasc.c:36
#define stride
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
#define MKTAG(a, b, c, d)
Definition: common.h:366
int palette_size
Definition: aasc.c:41
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1454
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981