adxenc: avoid stereo deinterleaving
[libav.git] / libavformat / adxdec.c
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
21 /**
22 * @file
23 * CRI ADX demuxer
24 */
25
26 #include "libavutil/intreadwrite.h"
27 #include "libavcodec/adx.h"
28 #include "avformat.h"
29 #include "internal.h"
30
31 #define BLOCK_SIZE 18
32 #define BLOCK_SAMPLES 32
33
34 typedef struct ADXDemuxerContext {
35 int header_size;
36 } ADXDemuxerContext;
37
38 static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
39 {
40 ADXDemuxerContext *c = s->priv_data;
41 AVCodecContext *avctx = s->streams[0]->codec;
42 int ret, size;
43
44 size = BLOCK_SIZE * avctx->channels;
45
46 pkt->pos = avio_tell(s->pb);
47 pkt->stream_index = 0;
48
49 ret = av_get_packet(s->pb, pkt, size);
50 if (ret != size) {
51 av_free_packet(pkt);
52 return ret < 0 ? ret : AVERROR(EIO);
53 }
54 if (AV_RB16(pkt->data) & 0x8000) {
55 av_free_packet(pkt);
56 return AVERROR_EOF;
57 }
58 pkt->size = size;
59 pkt->duration = 1;
60 pkt->pts = (pkt->pos - c->header_size) / size;
61
62 return 0;
63 }
64
65 static int adx_read_header(AVFormatContext *s, AVFormatParameters *ap)
66 {
67 ADXDemuxerContext *c = s->priv_data;
68 AVCodecContext *avctx;
69 int ret;
70
71 AVStream *st = avformat_new_stream(s, NULL);
72 if (!st)
73 return AVERROR(ENOMEM);
74 avctx = s->streams[0]->codec;
75
76 if (avio_rb16(s->pb) != 0x8000)
77 return AVERROR_INVALIDDATA;
78 c->header_size = avio_rb16(s->pb) + 4;
79 avio_seek(s->pb, -4, SEEK_CUR);
80
81 avctx->extradata = av_mallocz(c->header_size + FF_INPUT_BUFFER_PADDING_SIZE);
82 if (!avctx->extradata)
83 return AVERROR(ENOMEM);
84 if (avio_read(s->pb, avctx->extradata, c->header_size) < c->header_size) {
85 av_freep(&avctx->extradata);
86 return AVERROR(EIO);
87 }
88 avctx->extradata_size = c->header_size;
89
90 ret = avpriv_adx_decode_header(avctx, avctx->extradata,
91 avctx->extradata_size, &c->header_size,
92 NULL);
93 if (ret)
94 return ret;
95
96 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
97 st->codec->codec_id = s->iformat->value;
98
99 avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate);
100
101 return 0;
102 }
103
104 AVInputFormat ff_adx_demuxer = {
105 .name = "adx",
106 .long_name = NULL_IF_CONFIG_SMALL("CRI ADX"),
107 .priv_data_size = sizeof(ADXDemuxerContext),
108 .read_header = adx_read_header,
109 .read_packet = adx_read_packet,
110 .extensions = "adx",
111 .value = CODEC_ID_ADPCM_ADX,
112 };