FFmpeg
avs.c
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1 /*
2  * AVS demuxer.
3  * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
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  * Argonaut Games' Creature Shock demuxer
25  * @see http://wiki.multimedia.cx/index.php?title=AVS
26  */
27 
28 #include "avformat.h"
29 #include "voc.h"
30 
31 
32 typedef struct avs_format {
36  int width;
37  int height;
39  int fps;
40  int nb_frames;
43 } AvsFormat;
44 
45 typedef enum avs_block_type {
46  AVS_NONE = 0x00,
47  AVS_VIDEO = 0x01,
48  AVS_AUDIO = 0x02,
49  AVS_PALETTE = 0x03,
50  AVS_GAME_DATA = 0x04,
51 } AvsBlockType;
52 
53 static int avs_probe(const AVProbeData * p)
54 {
55  const uint8_t *d;
56 
57  d = p->buf;
58  if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
59  /* Ensure the buffer probe scores higher than the extension probe.
60  * This avoids problems with misdetection as AviSynth scripts. */
61  return AVPROBE_SCORE_EXTENSION + 5;
62 
63  return 0;
64 }
65 
67 {
68  AvsFormat *avs = s->priv_data;
69 
71 
72  avio_skip(s->pb, 4);
73  avs->width = avio_rl16(s->pb);
74  avs->height = avio_rl16(s->pb);
75  avs->bits_per_sample = avio_rl16(s->pb);
76  avs->fps = avio_rl16(s->pb);
77  avs->nb_frames = avio_rl32(s->pb);
78  avs->remaining_frame_size = 0;
79  avs->remaining_audio_size = 0;
80 
81  avs->st_video = avs->st_audio = NULL;
82 
83  if (avs->width != 318 || avs->height != 198)
84  av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
85  "when the avs format is supposed to be 318x198 only.\n",
86  avs->width, avs->height);
87 
88  return 0;
89 }
90 
91 static int
93  AvsBlockType type, int sub_type, int size,
94  uint8_t * palette, int palette_size)
95 {
96  AvsFormat *avs = s->priv_data;
97  int ret;
98 
99  ret = av_new_packet(pkt, size + palette_size);
100  if (ret < 0)
101  return ret;
102 
103  if (palette_size) {
104  pkt->data[0] = 0x00;
105  pkt->data[1] = 0x03;
106  pkt->data[2] = palette_size & 0xFF;
107  pkt->data[3] = (palette_size >> 8) & 0xFF;
108  memcpy(pkt->data + 4, palette, palette_size - 4);
109  }
110 
111  pkt->data[palette_size + 0] = sub_type;
112  pkt->data[palette_size + 1] = type;
113  pkt->data[palette_size + 2] = size & 0xFF;
114  pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
115  ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
116  if (ret < size) {
117  return AVERROR(EIO);
118  }
119 
120  pkt->size = ret + palette_size;
121  pkt->stream_index = avs->st_video->index;
122  if (sub_type == 0)
123  pkt->flags |= AV_PKT_FLAG_KEY;
124 
125  return 0;
126 }
127 
129 {
130  AvsFormat *avs = s->priv_data;
131  int ret, size;
132 
133  size = avio_tell(s->pb);
134  ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
135  size = avio_tell(s->pb) - size;
136  avs->remaining_audio_size -= size;
137 
138  if (ret == AVERROR(EIO))
139  return 0; /* this indicate EOS */
140  if (ret < 0)
141  return ret;
142 
143  pkt->stream_index = avs->st_audio->index;
144  pkt->flags |= AV_PKT_FLAG_KEY;
145 
146  return size;
147 }
148 
150 {
151  AvsFormat *avs = s->priv_data;
152  int sub_type = 0, size = 0;
154  int palette_size = 0;
155  uint8_t palette[4 + 3 * 256];
156  int ret;
157 
158  if (avs->remaining_audio_size > 0)
159  if (avs_read_audio_packet(s, pkt) > 0)
160  return 0;
161 
162  while (1) {
163  if (avs->remaining_frame_size <= 0) {
164  if (!avio_rl16(s->pb)) /* found EOF */
165  return AVERROR(EIO);
166  avs->remaining_frame_size = avio_rl16(s->pb) - 4;
167  }
168 
169  while (avs->remaining_frame_size > 0) {
170  sub_type = avio_r8(s->pb);
171  type = avio_r8(s->pb);
172  size = avio_rl16(s->pb);
173  if (size < 4)
174  return AVERROR_INVALIDDATA;
175  avs->remaining_frame_size -= size;
176 
177  switch (type) {
178  case AVS_PALETTE:
179  if (size - 4 > sizeof(palette))
180  return AVERROR_INVALIDDATA;
181  ret = avio_read(s->pb, palette, size - 4);
182  if (ret < size - 4)
183  return AVERROR(EIO);
184  palette_size = size;
185  break;
186 
187  case AVS_VIDEO:
188  if (!avs->st_video) {
189  avs->st_video = avformat_new_stream(s, NULL);
190  if (!avs->st_video)
191  return AVERROR(ENOMEM);
194  avs->st_video->codecpar->width = avs->width;
195  avs->st_video->codecpar->height = avs->height;
197  avs->st_video->nb_frames = avs->nb_frames;
198 #if FF_API_R_FRAME_RATE
199  avs->st_video->r_frame_rate =
200 #endif
201  avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
202  }
203  return avs_read_video_packet(s, pkt, type, sub_type, size,
204  palette, palette_size);
205 
206  case AVS_AUDIO:
207  if (!avs->st_audio) {
208  avs->st_audio = avformat_new_stream(s, NULL);
209  if (!avs->st_audio)
210  return AVERROR(ENOMEM);
212  }
213  avs->remaining_audio_size = size - 4;
214  size = avs_read_audio_packet(s, pkt);
215  if (size != 0)
216  return size;
217  break;
218 
219  default:
220  avio_skip(s->pb, size - 4);
221  }
222  }
223  }
224 }
225 
227  .name = "avs",
228  .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games Creature Shock"),
229  .priv_data_size = sizeof(AvsFormat),
233 };
#define NULL
Definition: coverity.c:32
int width
Definition: avs.c:36
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
Definition: voc_packet.c:27
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4036
int index
stream index in AVFormatContext
Definition: avformat.h:877
int size
Definition: avcodec.h:1534
GLint GLenum type
Definition: opengl_enc.c:104
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
static AVPacket pkt
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1402
static int avs_probe(const AVProbeData *p)
Definition: avs.c:53
Format I/O context.
Definition: avformat.h:1353
AVStream * st_video
Definition: avs.c:34
uint8_t
int remaining_audio_size
Definition: avs.c:42
int width
Video only.
Definition: avcodec.h:4102
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1297
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4524
uint8_t * data
Definition: avcodec.h:1533
ptrdiff_t size
Definition: opengl_enc.c:100
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:645
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1565
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
Definition: avs.c:32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:767
VocDecContext voc
Definition: avs.c:33
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
Definition: avs.c:31
AVInputFormat ff_avs_demuxer
Definition: avs.c:226
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:4032
int nb_frames
Definition: avs.c:40
int fps
Definition: avs.c:39
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:949
Definition: avs.c:46
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1539
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:636
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
int remaining_frame_size
Definition: avs.c:41
static int avs_read_video_packet(AVFormatContext *s, AVPacket *pkt, AvsBlockType type, int sub_type, int size, uint8_t *palette, int palette_size)
Definition: avs.c:92
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
Stream structure.
Definition: avformat.h:876
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream * st_audio
Definition: avs.c:35
AVIOContext * pb
I/O context.
Definition: avformat.h:1395
static int avs_read_audio_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avs.c:128
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
AvsBlockType
Definition: avs.c:30
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
static int avs_read_header(AVFormatContext *s)
Definition: avs.c:66
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:751
Main libavformat public API header.
Definition: avs.c:32
int bits_per_sample
Definition: avs.c:38
int height
Definition: avs.c:37
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:927
void * priv_data
Format private data.
Definition: avformat.h:1381
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4078
static int avs_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avs.c:149
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int stream_index
Definition: avcodec.h:1535
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
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1000
This structure stores compressed data.
Definition: avcodec.h:1510