FFmpeg
eacdata.c
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1 /*
2  * Electronic Arts .cdata file Demuxer
3  * Copyright (c) 2007 Peter Ross
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  * Electronic Arts cdata Format Demuxer
25  * by Peter Ross (pross@xvid.org)
26  *
27  * Technical details here:
28  * http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec
29  */
30 
31 #include "avformat.h"
32 #include "internal.h"
33 
34 typedef struct CdataDemuxContext {
35  unsigned int channels;
36  unsigned int audio_pts;
38 
39 static int cdata_probe(const AVProbeData *p)
40 {
41  const uint8_t *b = p->buf;
42 
43  if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C || b[1] == 0x14))
44  return AVPROBE_SCORE_MAX/8;
45  return 0;
46 }
47 
49 {
50  CdataDemuxContext *cdata = s->priv_data;
51  AVIOContext *pb = s->pb;
52  unsigned int sample_rate, header;
53  AVStream *st;
54  int64_t channel_layout = 0;
55 
56  header = avio_rb16(pb);
57  switch (header) {
58  case 0x0400: cdata->channels = 1; break;
59  case 0x0404: cdata->channels = 2; break;
60  case 0x040C: cdata->channels = 4; channel_layout = AV_CH_LAYOUT_QUAD; break;
61  case 0x0414: cdata->channels = 6; channel_layout = AV_CH_LAYOUT_5POINT1_BACK; break;
62  default:
63  av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);
64  return -1;
65  };
66 
67  sample_rate = avio_rb16(pb);
68  avio_skip(pb, (avio_r8(pb) & 0x20) ? 15 : 11);
69 
70  st = avformat_new_stream(s, NULL);
71  if (!st)
72  return AVERROR(ENOMEM);
74  st->codecpar->codec_tag = 0; /* no fourcc */
76  st->codecpar->channels = cdata->channels;
77  st->codecpar->channel_layout = channel_layout;
79  avpriv_set_pts_info(st, 64, 1, sample_rate);
80 
81  cdata->audio_pts = 0;
82  return 0;
83 }
84 
86 {
87  CdataDemuxContext *cdata = s->priv_data;
88  int packet_size = 76*cdata->channels;
89 
90  int ret = av_get_packet(s->pb, pkt, packet_size);
91  if (ret < 0)
92  return ret;
93  pkt->pts = cdata->audio_pts++;
94  return 0;
95 }
96 
98  .name = "ea_cdata",
99  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"),
100  .priv_data_size = sizeof(CdataDemuxContext),
104  .extensions = "cdata",
105 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: eacdata.c:85
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:4896
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3960
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
static int cdata_probe(const AVProbeData *p)
Definition: eacdata.c:39
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:788
Format I/O context.
Definition: avformat.h:1358
uint8_t
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4469
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
unsigned int audio_pts
Definition: eacdata.c:36
static const uint8_t header[24]
Definition: sdr2.c:67
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4062
#define av_log(a,...)
#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:3956
#define AV_CH_LAYOUT_QUAD
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
#define b
Definition: input.c:41
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat ff_ea_cdata_demuxer
Definition: eacdata.c:97
#define AV_CH_LAYOUT_5POINT1_BACK
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
sample_rate
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
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:4070
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
Main libavformat public API header.
unsigned int channels
Definition: eacdata.c:35
void * priv_data
Format private data.
Definition: avformat.h:1386
int channels
Audio only.
Definition: avcodec.h:4066
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
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3964
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
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 cdata_read_header(AVFormatContext *s)
Definition: eacdata.c:48