Libav
8bps.c
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1 /*
2  * Quicktime Planar RGB (8BPS) Video Decoder
3  * Copyright (C) 2003 Roberto Togni
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 
37 #include "libavutil/internal.h"
38 #include "libavutil/intreadwrite.h"
39 #include "avcodec.h"
40 #include "internal.h"
41 
42 
43 static const enum AVPixelFormat pixfmt_rgb24[] = {
45 
46 typedef struct EightBpsContext {
48 
49  unsigned char planes;
50  unsigned char planemap[4];
51 
52  uint32_t pal[256];
54 
56  int *got_frame, AVPacket *avpkt)
57 {
58  AVFrame *frame = data;
59  const uint8_t *buf = avpkt->data;
60  int buf_size = avpkt->size;
61  EightBpsContext * const c = avctx->priv_data;
62  const unsigned char *encoded = buf;
63  unsigned char *pixptr, *pixptr_end;
64  unsigned int height = avctx->height; // Real image height
65  unsigned int dlen, p, row;
66  const unsigned char *lp, *dp, *ep;
67  unsigned char count;
68  unsigned int px_inc;
69  unsigned int planes = c->planes;
70  unsigned char *planemap = c->planemap;
71  int ret;
72 
73  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
74  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
75  return ret;
76  }
77 
78  ep = encoded + buf_size;
79 
80  /* Set data pointer after line lengths */
81  dp = encoded + planes * (height << 1);
82 
83  /* Ignore alpha plane, don't know what to do with it */
84  if (planes == 4)
85  planes--;
86 
87  px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_RGB32);
88 
89  for (p = 0; p < planes; p++) {
90  /* Lines length pointer for this plane */
91  lp = encoded + p * (height << 1);
92 
93  /* Decode a plane */
94  for (row = 0; row < height; row++) {
95  pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
96  pixptr_end = pixptr + frame->linesize[0];
97  if (ep - lp < row * 2 + 2)
98  return AVERROR_INVALIDDATA;
99  dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
100  /* Decode a row of this plane */
101  while (dlen > 0) {
102  if (ep - dp <= 1)
103  return AVERROR_INVALIDDATA;
104  if ((count = *dp++) <= 127) {
105  count++;
106  dlen -= count + 1;
107  if (pixptr_end - pixptr < count * px_inc)
108  break;
109  if (ep - dp < count)
110  return AVERROR_INVALIDDATA;
111  while (count--) {
112  *pixptr = *dp++;
113  pixptr += px_inc;
114  }
115  } else {
116  count = 257 - count;
117  if (pixptr_end - pixptr < count * px_inc)
118  break;
119  while (count--) {
120  *pixptr = *dp;
121  pixptr += px_inc;
122  }
123  dp++;
124  dlen -= 2;
125  }
126  }
127  }
128  }
129 
130  if (avctx->bits_per_coded_sample <= 8) {
131  const uint8_t *pal = av_packet_get_side_data(avpkt,
133  NULL);
134  if (pal) {
135  frame->palette_has_changed = 1;
136  memcpy(c->pal, pal, AVPALETTE_SIZE);
137  }
138 
139  memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
140  }
141 
142  *got_frame = 1;
143 
144  /* always report that the buffer was completely consumed */
145  return buf_size;
146 }
147 
149 {
150  EightBpsContext * const c = avctx->priv_data;
151 
152  c->avctx = avctx;
153 
154  switch (avctx->bits_per_coded_sample) {
155  case 8:
156  avctx->pix_fmt = AV_PIX_FMT_PAL8;
157  c->planes = 1;
158  c->planemap[0] = 0; // 1st plane is palette indexes
159  break;
160  case 24:
161  avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24);
162  c->planes = 3;
163  c->planemap[0] = 2; // 1st plane is red
164  c->planemap[1] = 1; // 2nd plane is green
165  c->planemap[2] = 0; // 3rd plane is blue
166  break;
167  case 32:
168  avctx->pix_fmt = AV_PIX_FMT_RGB32;
169  c->planes = 4;
170  /* handle planemap setup later for decoding rgb24 data as rbg32 */
171  break;
172  default:
173  av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
174  avctx->bits_per_coded_sample);
175  return AVERROR_INVALIDDATA;
176  }
177 
178  if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
179  c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
180  c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
181  c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue
182  c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha???
183  }
184  return 0;
185 }
186 
188  .name = "8bps",
189  .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
190  .type = AVMEDIA_TYPE_VIDEO,
191  .id = AV_CODEC_ID_8BPS,
192  .priv_data_size = sizeof(EightBpsContext),
193  .init = decode_init,
194  .decode = decode_frame,
195  .capabilities = AV_CODEC_CAP_DR1,
196 };
#define AVPALETTE_SIZE
Definition: avcodec.h:3402
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
This structure describes decoded (raw) audio or video data.
Definition: frame.h:140
int size
Definition: avcodec.h:1347
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
uint32_t pal[256]
Definition: 8bps.c:52
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1621
AVCodec.
Definition: avcodec.h:3120
AVCodec ff_eightbps_decoder
Definition: 8bps.c:187
uint8_t
#define av_cold
Definition: attributes.h:66
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:70
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:1346
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2769
AVCodecContext * avctx
Definition: 8bps.c:47
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
const char * name
Name of the codec implementation.
Definition: avcodec.h:3127
common internal API header
unsigned char planes
Definition: 8bps.c:49
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: avconv.c:1288
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:62
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: 8bps.c:55
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
Definition: utils.c:785
NULL
Definition: eval.c:55
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:158
main external API structure.
Definition: avcodec.h:1409
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:242
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:589
static av_cold int decode_init(AVCodecContext *avctx)
Definition: 8bps.c:148
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:273
static enum AVPixelFormat pixfmt_rgb24[]
Definition: 8bps.c:43
unsigned char planemap[4]
Definition: 8bps.c:50
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:146
int height
Definition: gxfenc.c:72
common internal api header.
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:582
void * priv_data
Definition: avcodec.h:1451
#define av_be2ne16(x)
Definition: bswap.h:94
uint8_t * av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
Definition: avpacket.c:284
#define HAVE_BIGENDIAN
Definition: config.h:173
AVPixelFormat
Pixel format.
Definition: pixfmt.h:57
This structure stores compressed data.
Definition: avcodec.h:1323
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:838