FFmpeg
idroqdec.c
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1 /*
2  * id RoQ (.roq) File Demuxer
3  * Copyright (c) 2003 The FFmpeg project
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  * id RoQ format file demuxer
25  * by Mike Melanson (melanson@pcisys.net)
26  * for more information on the .roq file format, visit:
27  * http://www.csse.monash.edu.au/~timf/
28  */
29 
31 #include "libavutil/intreadwrite.h"
32 #include "avformat.h"
33 #include "internal.h"
34 #include "avio_internal.h"
35 
36 #define RoQ_MAGIC_NUMBER 0x1084
37 #define RoQ_CHUNK_PREAMBLE_SIZE 8
38 #define RoQ_AUDIO_SAMPLE_RATE 22050
39 #define RoQ_CHUNKS_TO_SCAN 30
40 
41 #define RoQ_INFO 0x1001
42 #define RoQ_QUAD_CODEBOOK 0x1002
43 #define RoQ_QUAD_VQ 0x1011
44 #define RoQ_SOUND_MONO 0x1020
45 #define RoQ_SOUND_STEREO 0x1021
46 
47 typedef struct RoqDemuxContext {
48 
50  int width;
51  int height;
53 
56 
57  int64_t video_pts;
58  unsigned int audio_frame_count;
59 
61 
62 static int roq_probe(const AVProbeData *p)
63 {
64  if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
65  (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
66  return 0;
67 
68  return AVPROBE_SCORE_MAX;
69 }
70 
72 {
73  RoqDemuxContext *roq = s->priv_data;
74  AVIOContext *pb = s->pb;
75  unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
76 
77  /* get the main header */
78  if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
80  return AVERROR(EIO);
81  roq->frame_rate = AV_RL16(&preamble[6]);
82 
83  /* init private context parameters */
84  roq->width = roq->height = roq->audio_channels = roq->video_pts =
85  roq->audio_frame_count = 0;
86  roq->audio_stream_index = -1;
87  roq->video_stream_index = -1;
88 
90 
91  return 0;
92 }
93 
95  AVPacket *pkt)
96 {
97  RoqDemuxContext *roq = s->priv_data;
98  AVIOContext *pb = s->pb;
99  int ret = 0;
100  unsigned int chunk_size;
101  unsigned int chunk_type;
102  unsigned int codebook_size;
103  unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
104  int packet_read = 0;
105  int64_t codebook_offset;
106 
107  while (!packet_read) {
108 
109  if (avio_feof(s->pb))
110  return AVERROR(EIO);
111 
112  /* get the next chunk preamble */
113  if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
115  return AVERROR(EIO);
116 
117  chunk_type = AV_RL16(&preamble[0]);
118  chunk_size = AV_RL32(&preamble[2]);
119  if(chunk_size > INT_MAX)
120  return AVERROR_INVALIDDATA;
121 
122  chunk_size = ffio_limit(pb, chunk_size);
123 
124  switch (chunk_type) {
125 
126  case RoQ_INFO:
127  if (roq->video_stream_index == -1) {
129  if (!st)
130  return AVERROR(ENOMEM);
131  avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
132  roq->video_stream_index = st->index;
135  st->codecpar->codec_tag = 0; /* no fourcc */
136 
138  return AVERROR(EIO);
139  st->codecpar->width = roq->width = AV_RL16(preamble);
140  st->codecpar->height = roq->height = AV_RL16(preamble + 2);
141  break;
142  }
143  /* don't care about this chunk anymore */
145  break;
146 
147  case RoQ_QUAD_CODEBOOK:
148  if (roq->video_stream_index < 0)
149  return AVERROR_INVALIDDATA;
150  /* packet needs to contain both this codebook and next VQ chunk */
151  codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
152  codebook_size = chunk_size;
153  avio_skip(pb, codebook_size);
154  if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
156  return AVERROR(EIO);
157  chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
158  codebook_size;
159 
160  if (chunk_size > INT_MAX)
161  return AVERROR_INVALIDDATA;
162 
163  /* rewind */
164  avio_seek(pb, codebook_offset, SEEK_SET);
165 
166  /* load up the packet */
167  ret= av_get_packet(pb, pkt, chunk_size);
168  if (ret != chunk_size)
169  return AVERROR(EIO);
170  pkt->stream_index = roq->video_stream_index;
171  pkt->pts = roq->video_pts++;
172 
173  packet_read = 1;
174  break;
175 
176  case RoQ_SOUND_MONO:
177  case RoQ_SOUND_STEREO:
178  if (roq->audio_stream_index == -1) {
180  if (!st)
181  return AVERROR(ENOMEM);
183  roq->audio_stream_index = st->index;
186  st->codecpar->codec_tag = 0; /* no tag */
187  if (chunk_type == RoQ_SOUND_STEREO) {
188  st->codecpar->channels = 2;
190  } else {
191  st->codecpar->channels = 1;
193  }
194  roq->audio_channels = st->codecpar->channels;
200  }
201  case RoQ_QUAD_VQ:
202  if (chunk_type == RoQ_QUAD_VQ) {
203  if (roq->video_stream_index < 0)
204  return AVERROR_INVALIDDATA;
205  }
206 
207  /* load up the packet */
208  if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
209  return AVERROR(EIO);
210  /* copy over preamble */
211  memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
212 
213  if (chunk_type == RoQ_QUAD_VQ) {
214  pkt->stream_index = roq->video_stream_index;
215  pkt->pts = roq->video_pts++;
216  } else {
217  pkt->stream_index = roq->audio_stream_index;
218  pkt->pts = roq->audio_frame_count;
219  roq->audio_frame_count += (chunk_size / roq->audio_channels);
220  }
221 
222  pkt->pos= avio_tell(pb);
223  ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
224  chunk_size);
225  if (ret != chunk_size) {
226  av_packet_unref(pkt);
227  ret = AVERROR(EIO);
228  }
229 
230  packet_read = 1;
231  break;
232 
233  default:
234  av_log(s, AV_LOG_ERROR, " unknown RoQ chunk (%04X)\n", chunk_type);
235  return AVERROR_INVALIDDATA;
236  }
237  }
238 
239  return ret;
240 }
241 
243  .name = "roq",
244  .long_name = NULL_IF_CONFIG_SMALL("id RoQ"),
245  .priv_data_size = sizeof(RoqDemuxContext),
249 };
#define NULL
Definition: coverity.c:32
int audio_channels
Definition: idroqdec.c:52
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
unsigned int audio_frame_count
Definition: idroqdec.c:58
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1500
void avpriv_set_pts_info(AVStream *s, 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:4929
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
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
int64_t video_pts
Definition: idroqdec.c:57
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1407
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
#define RoQ_SOUND_STEREO
Definition: idroqdec.c:45
#define RoQ_MAGIC_NUMBER
Definition: idroqdec.c:36
Format I/O context.
Definition: avformat.h:1358
int ffio_limit(AVIOContext *s, int size)
Definition: utils.c:247
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 roq_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: idroqdec.c:94
#define RoQ_INFO
Definition: idroqdec.c:41
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
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:310
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4070
#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
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3997
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
int audio_stream_index
Definition: idroqdec.c:55
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
#define RoQ_SOUND_MONO
Definition: idroqdec.c:44
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
int block_align
Audio only.
Definition: avcodec.h:4085
audio channel layout utility functions
#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
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
#define RoQ_CHUNK_PREAMBLE_SIZE
Definition: idroqdec.c:37
static int roq_probe(const AVProbeData *p)
Definition: idroqdec.c:62
#define RoQ_AUDIO_SAMPLE_RATE
Definition: idroqdec.c:38
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
int sample_rate
Audio only.
Definition: avcodec.h:4078
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
Main libavformat public API header.
int video_stream_index
Definition: idroqdec.c:54
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
int channels
Audio only.
Definition: avcodec.h:4074
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 avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
#define RoQ_QUAD_CODEBOOK
Definition: idroqdec.c:42
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3972
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
#define AV_CH_LAYOUT_MONO
AVInputFormat ff_roq_demuxer
Definition: idroqdec.c:242
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1457
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473
static int roq_read_header(AVFormatContext *s)
Definition: idroqdec.c:71
#define RoQ_QUAD_VQ
Definition: idroqdec.c:43