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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 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  * QT 8BPS Video Decoder by Roberto Togni
25  * For more information about the 8BPS format, visit:
26  * http://www.pcisys.net/~melanson/codecs/
27  *
28  * Supports: PAL8 (RGB 8bpp, paletted)
29  * : BGR24 (RGB 24bpp) (can also output it as RGB32)
30  * : RGB32 (RGB 32bpp, 4th plane is alpha)
31  */
32 
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 
55 static int decode_frame(AVCodecContext *avctx, void *data,
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 planes = c->planes;
69  unsigned char *planemap = c->planemap;
70  int ret;
71 
72  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
73  return ret;
74 
75  ep = encoded + buf_size;
76 
77  /* Set data pointer after line lengths */
78  dp = encoded + planes * (height << 1);
79 
80  for (p = 0; p < planes; p++) {
81  /* Lines length pointer for this plane */
82  lp = encoded + p * (height << 1);
83 
84  /* Decode a plane */
85  for (row = 0; row < height; row++) {
86  pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
87  pixptr_end = pixptr + frame->linesize[0];
88  if (ep - lp < row * 2 + 2)
89  return AVERROR_INVALIDDATA;
90  dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
91  /* Decode a row of this plane */
92  while (dlen > 0) {
93  if (ep - dp <= 1)
94  return AVERROR_INVALIDDATA;
95  if ((count = *dp++) <= 127) {
96  count++;
97  dlen -= count + 1;
98  if (pixptr_end - pixptr < count * planes)
99  break;
100  if (ep - dp < count)
101  return AVERROR_INVALIDDATA;
102  while (count--) {
103  *pixptr = *dp++;
104  pixptr += planes;
105  }
106  } else {
107  count = 257 - count;
108  if (pixptr_end - pixptr < count * planes)
109  break;
110  while (count--) {
111  *pixptr = *dp;
112  pixptr += planes;
113  }
114  dp++;
115  dlen -= 2;
116  }
117  }
118  }
119  }
120 
121  if (avctx->bits_per_coded_sample <= 8) {
122  const uint8_t *pal = av_packet_get_side_data(avpkt,
124  NULL);
125  if (pal) {
126  frame->palette_has_changed = 1;
127  memcpy(c->pal, pal, AVPALETTE_SIZE);
128  }
129 
130  memcpy (frame->data[1], c->pal, AVPALETTE_SIZE);
131  }
132 
133  *got_frame = 1;
134 
135  /* always report that the buffer was completely consumed */
136  return buf_size;
137 }
138 
140 {
141  EightBpsContext * const c = avctx->priv_data;
142 
143  c->avctx = avctx;
144 
145  switch (avctx->bits_per_coded_sample) {
146  case 8:
147  avctx->pix_fmt = AV_PIX_FMT_PAL8;
148  c->planes = 1;
149  c->planemap[0] = 0; // 1st plane is palette indexes
150  break;
151  case 24:
152  avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24);
153  c->planes = 3;
154  c->planemap[0] = 2; // 1st plane is red
155  c->planemap[1] = 1; // 2nd plane is green
156  c->planemap[2] = 0; // 3rd plane is blue
157  break;
158  case 32:
159  avctx->pix_fmt = AV_PIX_FMT_RGB32;
160  c->planes = 4;
161  /* handle planemap setup later for decoding rgb24 data as rbg32 */
162  break;
163  default:
164  av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
165  avctx->bits_per_coded_sample);
166  return AVERROR_INVALIDDATA;
167  }
168 
169  if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
170  c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
171  c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
172  c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue
173  c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha
174  }
175  return 0;
176 }
177 
179  .name = "8bps",
180  .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
181  .type = AVMEDIA_TYPE_VIDEO,
182  .id = AV_CODEC_ID_8BPS,
183  .priv_data_size = sizeof(EightBpsContext),
184  .init = decode_init,
185  .decode = decode_frame,
186  .capabilities = AV_CODEC_CAP_DR1,
187 };
#define NULL
Definition: coverity.c:32
#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:184
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1580
uint32_t pal[256]
Definition: 8bps.c:52
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1876
AVCodec.
Definition: avcodec.h:3541
AVCodec ff_eightbps_decoder
Definition: 8bps.c:178
uint8_t
#define av_cold
Definition: attributes.h:82
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
static AVFrame * frame
#define height
uint8_t * data
Definition: avcodec.h:1579
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3041
#define av_log(a,...)
AVCodecContext * avctx
Definition: 8bps.c:47
#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:176
const char * name
Name of the codec implementation.
Definition: avcodec.h:3548
GLsizei count
Definition: opengl_enc.c:109
common internal API header
unsigned char planes
Definition: 8bps.c:49
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
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:1090
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
main external API structure.
Definition: avcodec.h:1648
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:318
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:928
void * buf
Definition: avisynth_c.h:553
static av_cold int decode_init(AVCodecContext *avctx)
Definition: 8bps.c:139
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:328
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:198
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:722
common internal api header.
static double c[64]
void * priv_data
Definition: avcodec.h:1690
#define av_be2ne16(x)
Definition: bswap.h:92
uint8_t * av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
Definition: avpacket.c:334
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1556
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:955