FFmpeg  4.0
smush.c
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1 /*
2  * LucasArts Smush demuxer
3  * Copyright (c) 2006 Cyril Zorin
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 "libavutil/intreadwrite.h"
23 
24 #include "avformat.h"
25 #include "avio.h"
26 #include "internal.h"
27 
28 typedef struct SMUSHContext {
29  int version;
32 } SMUSHContext;
33 
35 {
36  if (((AV_RL32(p->buf) == MKTAG('S', 'A', 'N', 'M') &&
37  AV_RL32(p->buf + 8) == MKTAG('S', 'H', 'D', 'R')) ||
38  (AV_RL32(p->buf) == MKTAG('A', 'N', 'I', 'M') &&
39  AV_RL32(p->buf + 8) == MKTAG('A', 'H', 'D', 'R')))) {
40  return AVPROBE_SCORE_MAX;
41  }
42 
43  return 0;
44 }
45 
47 {
48  SMUSHContext *smush = ctx->priv_data;
49  AVIOContext *pb = ctx->pb;
50  AVStream *vst, *ast;
51  uint32_t magic, nframes, size, subversion, i;
52  uint32_t width = 0, height = 0, got_audio = 0, read = 0;
53  uint32_t sample_rate, channels, palette[256];
54 
55  magic = avio_rb32(pb);
56  avio_skip(pb, 4); // skip movie size
57 
58  if (magic == MKBETAG('A', 'N', 'I', 'M')) {
59  if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R'))
60  return AVERROR_INVALIDDATA;
61 
62  size = avio_rb32(pb);
63  if (size < 3 * 256 + 6)
64  return AVERROR_INVALIDDATA;
65 
66  smush->version = 0;
67  subversion = avio_rl16(pb);
68  nframes = avio_rl16(pb);
69  if (!nframes)
70  return AVERROR_INVALIDDATA;
71 
72  avio_skip(pb, 2); // skip pad
73 
74  for (i = 0; i < 256; i++)
75  palette[i] = avio_rb24(pb);
76 
77  avio_skip(pb, size - (3 * 256 + 6));
78  } else if (magic == MKBETAG('S', 'A', 'N', 'M')) {
79  if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R'))
80  return AVERROR_INVALIDDATA;
81 
82  size = avio_rb32(pb);
83  if (size < 14)
84  return AVERROR_INVALIDDATA;
85 
86  smush->version = 1;
87  subversion = avio_rl16(pb);
88  nframes = avio_rl32(pb);
89  if (!nframes)
90  return AVERROR_INVALIDDATA;
91 
92  avio_skip(pb, 2); // skip pad
93  width = avio_rl16(pb);
94  height = avio_rl16(pb);
95  avio_skip(pb, 2); // skip pad
96  avio_skip(pb, size - 14);
97 
98  if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D'))
99  return AVERROR_INVALIDDATA;
100 
101  size = avio_rb32(pb);
102  while (!got_audio && ((read + 8) < size)) {
103  uint32_t sig, chunk_size;
104 
105  if (avio_feof(pb))
106  return AVERROR_EOF;
107 
108  sig = avio_rb32(pb);
109  chunk_size = avio_rb32(pb);
110  read += 8;
111  switch (sig) {
112  case MKBETAG('W', 'a', 'v', 'e'):
113  got_audio = 1;
114  sample_rate = avio_rl32(pb);
115  if (!sample_rate)
116  return AVERROR_INVALIDDATA;
117 
118  channels = avio_rl32(pb);
119  if (!channels)
120  return AVERROR_INVALIDDATA;
121 
122  avio_skip(pb, chunk_size - 8);
123  read += chunk_size;
124  break;
125  case MKBETAG('B', 'l', '1', '6'):
126  case MKBETAG('A', 'N', 'N', 'O'):
127  avio_skip(pb, chunk_size);
128  read += chunk_size;
129  break;
130  default:
131  return AVERROR_INVALIDDATA;
132  }
133  }
134 
135  avio_skip(pb, size - read);
136  } else {
137  av_log(ctx, AV_LOG_ERROR, "Wrong magic\n");
138  return AVERROR_INVALIDDATA;
139  }
140 
141  vst = avformat_new_stream(ctx, 0);
142  if (!vst)
143  return AVERROR(ENOMEM);
144 
145  smush->video_stream_index = vst->index;
146 
147  avpriv_set_pts_info(vst, 64, 1, 15);
148 
149  vst->start_time = 0;
150  vst->duration =
151  vst->nb_frames = nframes;
152  vst->avg_frame_rate = av_inv_q(vst->time_base);
155  vst->codecpar->codec_tag = 0;
156  vst->codecpar->width = width;
157  vst->codecpar->height = height;
158 
159  if (!smush->version) {
160  if (ff_alloc_extradata(vst->codecpar, 1024 + 2))
161  return AVERROR(ENOMEM);
162 
163  AV_WL16(vst->codecpar->extradata, subversion);
164  for (i = 0; i < 256; i++)
165  AV_WL32(vst->codecpar->extradata + 2 + i * 4, palette[i]);
166  }
167 
168  if (got_audio) {
169  ast = avformat_new_stream(ctx, 0);
170  if (!ast)
171  return AVERROR(ENOMEM);
172 
173  smush->audio_stream_index = ast->index;
174 
175  ast->start_time = 0;
178  ast->codecpar->codec_tag = 0;
180  ast->codecpar->channels = channels;
181 
182  avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
183  }
184 
185  return 0;
186 }
187 
189 {
190  SMUSHContext *smush = ctx->priv_data;
191  AVIOContext *pb = ctx->pb;
192  int done = 0;
193  int ret;
194 
195  while (!done) {
196  uint32_t sig, size;
197 
198  if (avio_feof(pb))
199  return AVERROR_EOF;
200 
201  sig = avio_rb32(pb);
202  size = avio_rb32(pb);
203 
204  switch (sig) {
205  case MKBETAG('F', 'R', 'M', 'E'):
206  if (smush->version)
207  break;
208  if ((ret = av_get_packet(pb, pkt, size)) < 0)
209  return ret;
210 
211  pkt->stream_index = smush->video_stream_index;
212  done = 1;
213  break;
214  case MKBETAG('B', 'l', '1', '6'):
215  if ((ret = av_get_packet(pb, pkt, size)) < 0)
216  return ret;
217 
218  pkt->stream_index = smush->video_stream_index;
219  pkt->duration = 1;
220  done = 1;
221  break;
222  case MKBETAG('W', 'a', 'v', 'e'):
223  if (size < 13)
224  return AVERROR_INVALIDDATA;
225  if (av_get_packet(pb, pkt, size) < 13)
226  return AVERROR(EIO);
227 
228  pkt->stream_index = smush->audio_stream_index;
229  pkt->flags |= AV_PKT_FLAG_KEY;
230  pkt->duration = AV_RB32(pkt->data);
231  if (pkt->duration == 0xFFFFFFFFu)
232  pkt->duration = AV_RB32(pkt->data + 8);
233  done = 1;
234  break;
235  default:
236  avio_skip(pb, size);
237  break;
238  }
239  }
240 
241  return 0;
242 }
243 
245  .name = "smush",
246  .long_name = NULL_IF_CONFIG_SMALL("LucasArts Smush"),
247  .priv_data_size = sizeof(SMUSHContext),
251 };
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
Buffered I/O operations.
int size
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4811
channels
Definition: aptx.c:30
static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: smush.c:188
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
int index
stream index in AVFormatContext
Definition: avformat.h:874
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
static AVPacket pkt
AVInputFormat ff_smush_demuxer
Definition: smush.c:244
Format I/O context.
Definition: avformat.h:1342
int width
Video only.
Definition: avcodec.h:3950
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:801
#define AV_RB32
Definition: intreadwrite.h:130
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1448
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4441
#define height
uint8_t * data
Definition: avcodec.h:1430
#define AVERROR_EOF
End of file.
Definition: error.h:55
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1462
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3880
uint16_t width
Definition: gdv.c:47
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:946
int video_stream_index
Definition: smush.c:31
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1436
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
int version
Definition: smush.c:29
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:3271
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:794
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
AVFormatContext * ctx
Definition: movenc.c:48
#define AV_RL32
Definition: intreadwrite.h:146
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:873
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
static int smush_read_header(AVFormatContext *ctx)
Definition: smush.c:46
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
int sample_rate
Audio only.
Definition: avcodec.h:3994
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:754
Main libavformat public API header.
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:912
static int smush_read_probe(AVProbeData *p)
Definition: smush.c:34
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:924
#define MKBETAG(a, b, c, d)
Definition: common.h:367
int audio_stream_index
Definition: smush.c:30
void * priv_data
Format private data.
Definition: avformat.h:1370
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3898
int channels
Audio only.
Definition: avcodec.h:3990
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:358
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3888
int stream_index
Definition: avcodec.h:1432
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:902
#define MKTAG(a, b, c, d)
Definition: common.h:366
This structure stores compressed data.
Definition: avcodec.h:1407
#define AV_WL32(p, v)
Definition: intreadwrite.h:426