2 * Copyright (c) 2011 Justin Ruggles
4 * This file is part of Libav.
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.
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.
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
26 #include "libavutil/intreadwrite.h"
31 #define BLOCK_SAMPLES 32
33 typedef struct ADXDemuxerContext {
37 static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
39 ADXDemuxerContext *c = s->priv_data;
40 AVCodecContext *avctx = s->streams[0]->codec;
43 size = BLOCK_SIZE * avctx->channels;
45 pkt->pos = avio_tell(s->pb);
46 pkt->stream_index = 0;
48 ret = av_get_packet(s->pb, pkt, size);
51 return ret < 0 ? ret : AVERROR(EIO);
53 if (AV_RB16(pkt->data) & 0x8000) {
59 pkt->pts = (pkt->pos - c->header_size) / size;
64 static int adx_read_header(AVFormatContext *s)
66 ADXDemuxerContext *c = s->priv_data;
67 AVCodecContext *avctx;
69 AVStream *st = avformat_new_stream(s, NULL);
71 return AVERROR(ENOMEM);
72 avctx = s->streams[0]->codec;
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);
79 avctx->extradata = av_mallocz(c->header_size + FF_INPUT_BUFFER_PADDING_SIZE);
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);
86 avctx->extradata_size = c->header_size;
88 if (avctx->extradata_size < 12) {
89 av_log(s, AV_LOG_ERROR, "Invalid extradata size.\n");
90 return AVERROR_INVALIDDATA;
92 avctx->channels = AV_RB8(avctx->extradata + 7);
93 avctx->sample_rate = AV_RB32(avctx->extradata + 8);
95 if (avctx->channels <= 0) {
96 av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", avctx->channels);
97 return AVERROR_INVALIDDATA;
100 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
101 st->codec->codec_id = s->iformat->raw_codec_id;
103 avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate);
108 AVInputFormat ff_adx_demuxer = {
110 .long_name = NULL_IF_CONFIG_SMALL("CRI ADX"),
111 .priv_data_size = sizeof(ADXDemuxerContext),
112 .read_header = adx_read_header,
113 .read_packet = adx_read_packet,
115 .raw_codec_id = AV_CODEC_ID_ADPCM_ADX,
116 .flags = AVFMT_GENERIC_INDEX,