FFmpeg: libavformat/eacdata.c Source File

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libavformat

eacdata.c

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1 /*

2 * Electronic Arts .cdata file Demuxer

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 */

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 */

31 #include "avformat.h"

32 #include "internal.h"

34 typedef struct CdataDemuxContext {

35 unsigned int channels;

36 unsigned int audio_pts;

37 } CdataDemuxContext;

39 static int cdata_probe(AVProbeData *p)

40 {

41 const uint8_t *b = p->buf;

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 }

48 static int cdata_read_header(AVFormatContext *s)

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;

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 };

67 sample_rate = avio_rb16(pb);

68 avio_skip(pb, (avio_r8(pb) & 0x20) ? 15 : 11);

70 st = avformat_new_stream(s, NULL);

71 if (!st)

72 return AVERROR(ENOMEM);

73 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

74 st->codec->codec_tag = 0; /* no fourcc */

75 st->codec->codec_id = AV_CODEC_ID_ADPCM_EA_XAS;

76 st->codec->channels = cdata->channels;

77 st->codec->channel_layout = channel_layout;

78 st->codec->sample_rate = sample_rate;

79 avpriv_set_pts_info(st, 64, 1, sample_rate);

81 cdata->audio_pts = 0;

82 return 0;

83 }

85 static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt)

86 {

87 CdataDemuxContext *cdata = s->priv_data;

88 int packet_size = 76*cdata->channels;

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 }

97 AVInputFormat ff_ea_cdata_demuxer = {

98 .name = "ea_cdata",

99 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"),

100 .priv_data_size = sizeof(CdataDemuxContext),

101 .read_probe = cdata_probe,

102 .read_header = cdata_read_header,

103 .read_packet = cdata_read_packet,

104 .extensions = "cdata",

105 };

NULL

#define NULL

Definition: coverity.c:32

const char * s

Definition: avisynth_c.h:631

AVIOContext

Bytestream IO Context.

Definition: avio.h:111

cdata_read_packet

static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt)

Definition: eacdata.c:85

avpriv_set_pts_info

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:4149

const char * b

Definition: vf_curves.c:109

avio_skip

int64_t avio_skip(AVIOContext *s, int64_t offset)

Skip given number of bytes forward.

Definition: aviobuf.c:282

AVInputFormat

Definition: avformat.h:656

pkt

static AVPacket pkt

Definition: demuxing_decoding.c:54

avio_rb16

unsigned int avio_rb16(AVIOContext *s)

Definition: aviobuf.c:683

AVFormatContext

Format I/O context.

Definition: avformat.h:1314

uint8_t

Definition: audio_convert.c:194

avformat_new_stream

AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)

Add a new stream to a media file.

Definition: utils.c:3805

av_get_packet

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:252

CdataDemuxContext::audio_pts

unsigned int audio_pts

Definition: eacdata.c:36

header

static const uint8_t header[24]

Definition: sdr2.c:67

av_log

#define av_log(a,...)

Definition: tableprint_vlc.h:28

AVERROR

#define AVERROR(e)

Definition: error.h:43

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:176

AVMEDIA_TYPE_AUDIO

Definition: avutil.h:194

AV_CH_LAYOUT_QUAD

#define AV_CH_LAYOUT_QUAD

Definition: channel_layout.h:94

internal.h

CdataDemuxContext

Definition: eacdata.c:34

AVCodecContext::channel_layout

uint64_t channel_layout

Audio channel layout.

Definition: avcodec.h:2338

avio_r8

int avio_r8(AVIOContext *s)

Definition: aviobuf.c:536

AVStream::codec

AVCodecContext * codec

Codec context associated with this stream.

Definition: avformat.h:896

AVProbeData::buf

unsigned char * buf

Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.

Definition: avformat.h:462

read_probe

static int read_probe(AVProbeData *pd)

Definition: jvdec.c:55

ff_ea_cdata_demuxer

AVInputFormat ff_ea_cdata_demuxer

Definition: eacdata.c:97

AV_CH_LAYOUT_5POINT1_BACK

#define AV_CH_LAYOUT_5POINT1_BACK

Definition: channel_layout.h:98

read_header

static int read_header(FFV1Context *f)

Definition: ffv1dec.c:638

AVStream

Stream structure.

Definition: avformat.h:877

AV_CODEC_ID_ADPCM_EA_XAS

Definition: avcodec.h:383

read_packet

static int read_packet(void *opaque, uint8_t *buf, int buf_size)

Definition: avio_reading.c:42

sample_rate

Definition: ffmpeg_filter.c:190

AV_LOG_INFO

#define AV_LOG_INFO

Standard information.

Definition: log.h:187

AVCodecContext::codec_type

enum AVMediaType codec_type

Definition: avcodec.h:1540

AVCodecContext::codec_id

enum AVCodecID codec_id

Definition: avcodec.h:1549

AVCodecContext::sample_rate

int sample_rate

samples per second

Definition: avcodec.h:2287

AVFormatContext::pb

AVIOContext * pb

I/O context.

Definition: avformat.h:1356

AVCodecContext::codec_tag

unsigned int codec_tag

fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').

Definition: avcodec.h:1564

AVProbeData

This structure contains the data a format has to probe a file.

Definition: avformat.h:460

AVPROBE_SCORE_MAX

#define AVPROBE_SCORE_MAX

maximum score

Definition: avformat.h:472

avformat.h

Main libavformat public API header.

AVCodecContext::channels

int channels

number of audio channels

Definition: avcodec.h:2288

CdataDemuxContext::channels

unsigned int channels

Definition: eacdata.c:35

AVFormatContext::priv_data

void * priv_data

Format private data.

Definition: avformat.h:1342

AVInputFormat::name

const char * name

A comma separated list of short names for the format.

Definition: avformat.h:661

cdata_probe

static int cdata_probe(AVProbeData *p)

Definition: eacdata.c:39

AVPacket

This structure stores compressed data.

Definition: avcodec.h:1444

AVPacket::pts

int64_t pts

Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...

Definition: avcodec.h:1460

cdata_read_header

static int cdata_read_header(AVFormatContext *s)

Definition: eacdata.c:48

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