Libav
adxdec.c
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1 /*
2  * Copyright (c) 2011 Justin Ruggles
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
26 #include "libavutil/intreadwrite.h"
27 #include "avformat.h"
28 #include "internal.h"
29 
30 #define BLOCK_SIZE 18
31 #define BLOCK_SAMPLES 32
32 
33 typedef struct ADXDemuxerContext {
36 
38 {
40  AVCodecContext *avctx = s->streams[0]->codec;
41  int ret, size;
42 
43  size = BLOCK_SIZE * avctx->channels;
44 
45  pkt->pos = avio_tell(s->pb);
46  pkt->stream_index = 0;
47 
48  ret = av_get_packet(s->pb, pkt, size);
49  if (ret != size) {
50  av_free_packet(pkt);
51  return ret < 0 ? ret : AVERROR(EIO);
52  }
53  if (AV_RB16(pkt->data) & 0x8000) {
54  av_free_packet(pkt);
55  return AVERROR_EOF;
56  }
57  pkt->size = size;
58  pkt->duration = 1;
59  pkt->pts = (pkt->pos - c->header_size) / size;
60 
61  return 0;
62 }
63 
65 {
67  AVCodecContext *avctx;
68 
70  if (!st)
71  return AVERROR(ENOMEM);
72  avctx = s->streams[0]->codec;
73 
74  if (avio_rb16(s->pb) != 0x8000)
75  return AVERROR_INVALIDDATA;
76  c->header_size = avio_rb16(s->pb) + 4;
77  avio_seek(s->pb, -4, SEEK_CUR);
78 
80  if (!avctx->extradata)
81  return AVERROR(ENOMEM);
82  if (avio_read(s->pb, avctx->extradata, c->header_size) < c->header_size) {
83  av_freep(&avctx->extradata);
84  return AVERROR(EIO);
85  }
86  avctx->extradata_size = c->header_size;
87 
88  if (avctx->extradata_size < 12) {
89  av_log(s, AV_LOG_ERROR, "Invalid extradata size.\n");
90  return AVERROR_INVALIDDATA;
91  }
92  avctx->channels = AV_RB8(avctx->extradata + 7);
93  avctx->sample_rate = AV_RB32(avctx->extradata + 8);
94 
95  if (avctx->channels <= 0) {
96  av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", avctx->channels);
97  return AVERROR_INVALIDDATA;
98  }
99 
101  st->codec->codec_id = s->iformat->raw_codec_id;
102 
104 
105  return 0;
106 }
107 
109  .name = "adx",
110  .long_name = NULL_IF_CONFIG_SMALL("CRI ADX"),
111  .priv_data_size = sizeof(ADXDemuxerContext),
114  .extensions = "adx",
115  .raw_codec_id = AV_CODEC_ID_ADPCM_ADX,
117 };
#define AV_RB8(x)
Definition: intreadwrite.h:357
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:243
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:998
static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: adxdec.c:37
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:2829
int size
Definition: avcodec.h:974
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:186
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:580
#define BLOCK_SAMPLES
Definition: adxdec.c:31
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
Format I/O context.
Definition: avformat.h:922
#define AV_RB32
Definition: intreadwrite.h:130
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2521
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:990
uint8_t * data
Definition: avcodec.h:973
static int flags
Definition: log.c:44
#define AVERROR_EOF
End of file.
Definition: error.h:51
static int adx_read_header(AVFormatContext *s)
Definition: adxdec.c:64
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:117
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:991
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:452
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define BLOCK_SIZE
Definition: adxdec.c:30
#define AV_RB16
Definition: intreadwrite.h:53
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:531
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:544
Stream structure.
Definition: avformat.h:699
NULL
Definition: eval.c:55
enum AVMediaType codec_type
Definition: avcodec.h:1058
enum AVCodecID codec_id
Definition: avcodec.h:1067
int sample_rate
samples per second
Definition: avcodec.h:1807
AVIOContext * pb
I/O context.
Definition: avformat.h:964
main external API structure.
Definition: avcodec.h:1050
int extradata_size
Definition: avcodec.h:1165
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:417
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:571
Main libavformat public API header.
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:934
int channels
number of audio channels
Definition: avcodec.h:1808
void * priv_data
Format private data.
Definition: avformat.h:950
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:525
int stream_index
Definition: avcodec.h:975
AVInputFormat ff_adx_demuxer
Definition: adxdec.c:108
This structure stores compressed data.
Definition: avcodec.h:950
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:205
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:966