FFmpeg  4.3
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, 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;
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);
192  avs->st_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
193  avs->st_video->codecpar->codec_id = AV_CODEC_ID_AVS;
194  avs->st_video->codecpar->width = avs->width;
195  avs->st_video->codecpar->height = avs->height;
196  avs->st_video->codecpar->bits_per_coded_sample=avs->bits_per_sample;
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);
211  avs->st_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
212  }
213  avs->remaining_audio_size = size - 4;
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 };
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:4519
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:355
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:388
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:557
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:731
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
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVInputFormat
Definition: avformat.h:636
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:88
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:641
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
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:1335
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:1284
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:441
avs_format::st_audio
AVStream * st_audio
Definition: avs.c:35
ff_avs_demuxer
AVInputFormat ff_avs_demuxer
Definition: avs.c:226
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:747
AVPacket::size
int size
Definition: packet.h:356
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:186
size
int size
Definition: twinvq_data.h:11134
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:361
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:131
avs_read_packet
static int avs_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avs.c:149
uint8_t
uint8_t
Definition: audio_convert.c:194
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:865
avformat.h
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
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:357
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
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:332
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:59
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