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  av_packet_unref(pkt);
118  return AVERROR(EIO);
119  }
120 
121  pkt->size = ret + palette_size;
122  pkt->stream_index = avs->st_video->index;
123  if (sub_type == 0)
124  pkt->flags |= AV_PKT_FLAG_KEY;
125 
126  return 0;
127 }
128 
130 {
131  AvsFormat *avs = s->priv_data;
132  int ret, size;
133 
134  size = avio_tell(s->pb);
135  ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
136  size = avio_tell(s->pb) - size;
137  avs->remaining_audio_size -= size;
138 
139  if (ret == AVERROR(EIO))
140  return 0; /* this indicate EOS */
141  if (ret < 0)
142  return ret;
143 
144  pkt->stream_index = avs->st_audio->index;
145  pkt->flags |= AV_PKT_FLAG_KEY;
146 
147  return size;
148 }
149 
151 {
152  AvsFormat *avs = s->priv_data;
153  int sub_type = 0, size = 0;
155  int palette_size = 0;
156  uint8_t palette[4 + 3 * 256];
157  int ret;
158 
159  if (avs->remaining_audio_size > 0)
160  if (avs_read_audio_packet(s, pkt) > 0)
161  return 0;
162 
163  while (1) {
164  if (avs->remaining_frame_size <= 0) {
165  if (!avio_rl16(s->pb)) /* found EOF */
166  return AVERROR(EIO);
167  avs->remaining_frame_size = avio_rl16(s->pb) - 4;
168  }
169 
170  while (avs->remaining_frame_size > 0) {
171  sub_type = avio_r8(s->pb);
172  type = avio_r8(s->pb);
173  size = avio_rl16(s->pb);
174  if (size < 4)
175  return AVERROR_INVALIDDATA;
176  avs->remaining_frame_size -= size;
177 
178  switch (type) {
179  case AVS_PALETTE:
180  if (size - 4 > sizeof(palette))
181  return AVERROR_INVALIDDATA;
182  ret = avio_read(s->pb, palette, size - 4);
183  if (ret < size - 4)
184  return AVERROR(EIO);
185  palette_size = size;
186  break;
187 
188  case AVS_VIDEO:
189  if (!avs->st_video) {
190  avs->st_video = avformat_new_stream(s, NULL);
191  if (!avs->st_video)
192  return AVERROR(ENOMEM);
195  avs->st_video->codecpar->width = avs->width;
196  avs->st_video->codecpar->height = avs->height;
198  avs->st_video->nb_frames = avs->nb_frames;
199 #if FF_API_R_FRAME_RATE
200  avs->st_video->r_frame_rate =
201 #endif
202  avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
203  }
204  return avs_read_video_packet(s, pkt, type, sub_type, size,
205  palette, palette_size);
206 
207  case AVS_AUDIO:
208  if (!avs->st_audio) {
209  avs->st_audio = avformat_new_stream(s, NULL);
210  if (!avs->st_audio)
211  return AVERROR(ENOMEM);
213  }
214  avs->remaining_audio_size = size - 4;
215  size = avs_read_audio_packet(s, pkt);
216  if (size != 0)
217  return size;
218  break;
219 
220  default:
221  avio_skip(s->pb, size - 4);
222  }
223  }
224  }
225 }
226 
228 {
229  return 0;
230 }
231 
233  .name = "avs",
234  .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games Creature Shock"),
235  .priv_data_size = sizeof(AvsFormat),
240 };
#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:3968
int index
stream index in AVFormatContext
Definition: avformat.h:882
int size
Definition: avcodec.h:1481
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:334
static AVPacket pkt
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1407
static int avs_probe(const AVProbeData *p)
Definition: avs.c:53
Format I/O context.
Definition: avformat.h:1358
AVStream * st_video
Definition: avs.c:34
uint8_t
int remaining_audio_size
Definition: avs.c:42
int width
Video only.
Definition: avcodec.h:4034
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1302
static int avs_read_close(AVFormatContext *s)
Definition: avs.c:227
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4502
uint8_t * data
Definition: avcodec.h:1480
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
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:650
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1512
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:772
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:232
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
int nb_frames
Definition: avs.c:40
int fps
Definition: avs.c:39
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:954
Definition: avs.c:46
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1486
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:641
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
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:530
Stream structure.
Definition: avformat.h:881
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:1400
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
static int avs_read_audio_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avs.c:129
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:456
AvsBlockType
Definition: avs.c:30
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
static int avs_read_header(AVFormatContext *s)
Definition: avs.c:66
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:756
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:932
void * priv_data
Format private data.
Definition: avformat.h:1386
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
static int avs_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avs.c:150
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 stream_index
Definition: avcodec.h:1482
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:1005
This structure stores compressed data.
Definition: avcodec.h:1457