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  int ret;
55 
56  magic = avio_rb32(pb);
57  avio_skip(pb, 4); // skip movie size
58 
59  if (magic == MKBETAG('A', 'N', 'I', 'M')) {
60  if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R'))
61  return AVERROR_INVALIDDATA;
62 
63  size = avio_rb32(pb);
64  if (size < 3 * 256 + 6)
65  return AVERROR_INVALIDDATA;
66 
67  smush->version = 0;
68  subversion = avio_rl16(pb);
69  nframes = avio_rl16(pb);
70  if (!nframes)
71  return AVERROR_INVALIDDATA;
72 
73  avio_skip(pb, 2); // skip pad
74 
75  for (i = 0; i < 256; i++)
76  palette[i] = avio_rb24(pb);
77 
78  avio_skip(pb, size - (3 * 256 + 6));
79  } else if (magic == MKBETAG('S', 'A', 'N', 'M')) {
80  if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R'))
81  return AVERROR_INVALIDDATA;
82 
83  size = avio_rb32(pb);
84  if (size < 14)
85  return AVERROR_INVALIDDATA;
86 
87  smush->version = 1;
88  subversion = avio_rl16(pb);
89  nframes = avio_rl32(pb);
90  if (!nframes)
91  return AVERROR_INVALIDDATA;
92 
93  avio_skip(pb, 2); // skip pad
94  width = avio_rl16(pb);
95  height = avio_rl16(pb);
96  avio_skip(pb, 2); // skip pad
97  avio_skip(pb, size - 14);
98 
99  if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D'))
100  return AVERROR_INVALIDDATA;
101 
102  size = avio_rb32(pb);
103  while (!got_audio && ((read + 8) < size)) {
104  uint32_t sig, chunk_size;
105 
106  if (avio_feof(pb))
107  return AVERROR_EOF;
108 
109  sig = avio_rb32(pb);
110  chunk_size = avio_rb32(pb);
111  read += 8;
112  switch (sig) {
113  case MKBETAG('W', 'a', 'v', 'e'):
114  got_audio = 1;
115  sample_rate = avio_rl32(pb);
116  if (!sample_rate)
117  return AVERROR_INVALIDDATA;
118 
119  channels = avio_rl32(pb);
120  if (!channels)
121  return AVERROR_INVALIDDATA;
122 
123  avio_skip(pb, chunk_size - 8);
124  read += chunk_size;
125  break;
126  case MKBETAG('B', 'l', '1', '6'):
127  case MKBETAG('A', 'N', 'N', 'O'):
128  avio_skip(pb, chunk_size);
129  read += chunk_size;
130  break;
131  default:
132  return AVERROR_INVALIDDATA;
133  }
134  }
135 
136  avio_skip(pb, size - read);
137  } else {
138  av_log(ctx, AV_LOG_ERROR, "Wrong magic\n");
139  return AVERROR_INVALIDDATA;
140  }
141 
142  vst = avformat_new_stream(ctx, 0);
143  if (!vst)
144  return AVERROR(ENOMEM);
145 
146  smush->video_stream_index = vst->index;
147 
148  avpriv_set_pts_info(vst, 64, 1, 15);
149 
150  vst->start_time = 0;
151  vst->duration =
152  vst->nb_frames = nframes;
153  vst->avg_frame_rate = av_inv_q(vst->time_base);
156  vst->codecpar->codec_tag = 0;
157  vst->codecpar->width = width;
158  vst->codecpar->height = height;
159 
160  if (!smush->version) {
161  if ((ret = ff_alloc_extradata(vst->codecpar, 1024 + 2)) < 0)
162  return ret;
163 
164  AV_WL16(vst->codecpar->extradata, subversion);
165  for (i = 0; i < 256; i++)
166  AV_WL32(vst->codecpar->extradata + 2 + i * 4, palette[i]);
167  }
168 
169  if (got_audio) {
170  ast = avformat_new_stream(ctx, 0);
171  if (!ast)
172  return AVERROR(ENOMEM);
173 
174  smush->audio_stream_index = ast->index;
175 
176  ast->start_time = 0;
179  ast->codecpar->codec_tag = 0;
181  ast->codecpar->channels = channels;
182 
183  avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
184  }
185 
186  return 0;
187 }
188 
190 {
191  SMUSHContext *smush = ctx->priv_data;
192  AVIOContext *pb = ctx->pb;
193  int done = 0;
194  int ret;
195 
196  while (!done) {
197  uint32_t sig, size;
198 
199  if (avio_feof(pb))
200  return AVERROR_EOF;
201 
202  sig = avio_rb32(pb);
203  size = avio_rb32(pb);
204 
205  switch (sig) {
206  case MKBETAG('F', 'R', 'M', 'E'):
207  if (smush->version)
208  break;
209  if ((ret = av_get_packet(pb, pkt, size)) < 0)
210  return ret;
211 
213  done = 1;
214  break;
215  case MKBETAG('B', 'l', '1', '6'):
216  if ((ret = av_get_packet(pb, pkt, size)) < 0)
217  return ret;
218 
220  pkt->duration = 1;
221  done = 1;
222  break;
223  case MKBETAG('W', 'a', 'v', 'e'):
224  if (size < 13)
225  return AVERROR_INVALIDDATA;
226  if (av_get_packet(pb, pkt, size) < 13)
227  return AVERROR(EIO);
228 
231  pkt->duration = AV_RB32(pkt->data);
232  if (pkt->duration == 0xFFFFFFFFu)
233  pkt->duration = AV_RB32(pkt->data + 8);
234  done = 1;
235  break;
236  default:
237  avio_skip(pb, size);
238  break;
239  }
240  }
241 
242  return 0;
243 }
244 
246  .name = "smush",
247  .long_name = NULL_IF_CONFIG_SMALL("LucasArts Smush"),
248  .priv_data_size = sizeof(SMUSHContext),
252 };
AV_CODEC_ID_SANM
@ AV_CODEC_ID_SANM
Definition: codec_id.h:232
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
AVERROR
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:724
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AV_WL32
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
smush_read_probe
static int smush_read_probe(const AVProbeData *p)
Definition: smush.c:34
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AVPacket::data
uint8_t * data
Definition: packet.h:373
AVStream::avg_frame_rate
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:912
SMUSHContext::version
int version
Definition: smush.c:29
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:391
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:425
sample_rate
sample_rate
Definition: ffmpeg_filter.c:156
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
smush_read_packet
static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: smush.c:189
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:888
SMUSHContext
Definition: smush.c:28
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:726
ff_smush_demuxer
const AVInputFormat ff_smush_demuxer
Definition: smush.c:245
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:773
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVInputFormat
Definition: avformat.h:626
width
#define width
intreadwrite.h
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
ctx
AVFormatContext * ctx
Definition: movenc.c:48
channels
channels
Definition: aptx.h:33
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:992
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:868
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AV_CODEC_ID_ADPCM_VIMA
@ AV_CODEC_ID_ADPCM_VIMA
Definition: codec_id.h:382
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1139
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:890
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:742
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
avio_rb24
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:766
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
SMUSHContext::video_stream_index
int video_stream_index
Definition: smush.c:31
size
int size
Definition: twinvq_data.h:10344
avio.h
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
AV_RB32
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:96
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
height
#define height
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:379
i
int i
Definition: input.c:406
AVCodecParameters::height
int height
Definition: codec_par.h:127
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
av_get_packet
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:196
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:845
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:846
smush_read_header
static int smush_read_header(AVFormatContext *ctx)
Definition: smush.c:46
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, 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:1146
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:333
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:878
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1125
SMUSHContext::audio_stream_index
int audio_stream_index
Definition: smush.c:30
ff_alloc_extradata
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:451
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:360