FFmpeg
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 
34 static int smush_read_probe(const AVProbeData *p)
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.
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:4929
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:3968
int index
stream index in AVFormatContext
Definition: avformat.h:882
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
static AVPacket pkt
AVInputFormat ff_smush_demuxer
Definition: smush.c:244
Format I/O context.
Definition: avformat.h:1358
int width
Video only.
Definition: avcodec.h:4034
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:803
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1498
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4502
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
#define height
uint8_t * data
Definition: avcodec.h:1480
#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
ptrdiff_t size
Definition: opengl_enc.c:100
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1512
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#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:772
#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:3964
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:954
int video_stream_index
Definition: smush.c:31
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1486
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
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:3321
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:796
#define width
static int smush_read_probe(const AVProbeData *p)
Definition: smush.c:34
AVFormatContext * ctx
Definition: movenc.c:48
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
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:1400
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:446
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
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:4078
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:756
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:920
#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:932
#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:1386
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3982
int channels
Audio only.
Definition: avcodec.h:4074
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3972
int stream_index
Definition: avcodec.h:1482
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:910
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
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1457
#define AV_WL32(p, v)
Definition: intreadwrite.h:426