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 {
33  VocDecContext voc;
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 
70  s->ctx_flags |= AVFMTCTX_NOHEADER;
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)
124 
125  return 0;
126 }
127 
129 {
130  AvsFormat *avs = s->priv_data;
131  int ret;
132  int64_t 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;
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);
193  avs->st_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
194  avs->st_video->codecpar->codec_id = AV_CODEC_ID_AVS;
195  avs->st_video->codecpar->width = avs->width;
196  avs->st_video->codecpar->height = avs->height;
197  avs->st_video->codecpar->bits_per_coded_sample=avs->bits_per_sample;
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);
212  avs->st_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
213  }
214  avs->remaining_audio_size = size - 4;
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  .name = "avs",
229  .long_name = NULL_IF_CONFIG_SMALL("Argonaut Games Creature Shock"),
230  .priv_data_size = sizeof(AvsFormat),
234 };
AVS_NONE
@ AVS_NONE
Definition: avs.c:46
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
AVS_VIDEO
@ AVS_VIDEO
Definition: avs.c:31
avs_read_audio_packet
static int avs_read_audio_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avs.c:128
avs_format::height
int height
Definition: avs.c:37
AVPacket::data
uint8_t * data
Definition: packet.h:373
avs_read_video_packet
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
AVS_AUDIO
@ AVS_AUDIO
Definition: avs.c:32
avs_format::nb_frames
int nb_frames
Definition: avs.c:40
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:425
ff_avs_demuxer
const AVInputFormat ff_avs_demuxer
Definition: avs.c:227
avs_format::width
int width
Definition: avs.c:36
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:486
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:726
AvsBlockType
AvsBlockType
Definition: avs.c:30
avs_format::bits_per_sample
int bits_per_sample
Definition: avs.c:38
AVS_GAME_DATA
@ AVS_GAME_DATA
Definition: avs.c:34
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
avs_format
Definition: avs.c:32
s
#define s(width, name)
Definition: cbs_vp9.c:257
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
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
avs_format::st_video
AVStream * st_video
Definition: avs.c:34
avs_format::voc
VocDecContext voc
Definition: avs.c:33
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVFMTCTX_NOHEADER
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1048
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
avs_format::st_audio
AVStream * st_audio
Definition: avs.c:35
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:456
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:742
AVPacket::size
int size
Definition: packet.h:374
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
size
int size
Definition: twinvq_data.h:10344
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:616
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:379
AVS_PALETTE
@ AVS_PALETTE
Definition: avs.c:33
voc.h
ff_voc_get_packet
int ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
Definition: voc_packet.c:27
AV_CODEC_ID_AVS
@ AV_CODEC_ID_AVS
Definition: codec_id.h:132
avs_read_packet
static int avs_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avs.c:150
avs_format::fps
int fps
Definition: avs.c:39
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
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:625
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
avs_block_type
avs_block_type
Definition: avs.c:45
avs_format::remaining_frame_size
int remaining_frame_size
Definition: avs.c:41
AVPacket
This structure stores compressed data.
Definition: packet.h:350
d
d
Definition: ffmpeg_filter.c:156
avs_format::remaining_audio_size
int remaining_audio_size
Definition: avs.c:42
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
avs_read_header
static int avs_read_header(AVFormatContext *s)
Definition: avs.c:66
avs_probe
static int avs_probe(const AVProbeData *p)
Definition: avs.c:53