yading@11: /*
yading@11:  * Copyright (c) 2011 Justin Ruggles
yading@11:  *
yading@11:  * This file is part of Libav.
yading@11:  *
yading@11:  * Libav is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * Libav is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with Libav; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * CRI ADX demuxer
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavcodec/adx.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: #define BLOCK_SIZE    18
yading@11: #define BLOCK_SAMPLES 32
yading@11: 
yading@11: typedef struct ADXDemuxerContext {
yading@11:     int header_size;
yading@11: } ADXDemuxerContext;
yading@11: 
yading@11: static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     ADXDemuxerContext *c = s->priv_data;
yading@11:     AVCodecContext *avctx = s->streams[0]->codec;
yading@11:     int ret, size;
yading@11: 
yading@11:     size = BLOCK_SIZE * avctx->channels;
yading@11: 
yading@11:     pkt->pos = avio_tell(s->pb);
yading@11:     pkt->stream_index = 0;
yading@11: 
yading@11:     ret = av_get_packet(s->pb, pkt, size);
yading@11:     if (ret != size) {
yading@11:         av_free_packet(pkt);
yading@11:         return ret < 0 ? ret : AVERROR(EIO);
yading@11:     }
yading@11:     if (AV_RB16(pkt->data) & 0x8000) {
yading@11:         av_free_packet(pkt);
yading@11:         return AVERROR_EOF;
yading@11:     }
yading@11:     pkt->size     = size;
yading@11:     pkt->duration = 1;
yading@11:     pkt->pts      = (pkt->pos - c->header_size) / size;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int adx_read_header(AVFormatContext *s)
yading@11: {
yading@11:     ADXDemuxerContext *c = s->priv_data;
yading@11:     AVCodecContext *avctx;
yading@11:     int ret;
yading@11: 
yading@11:     AVStream *st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11:     avctx = s->streams[0]->codec;
yading@11: 
yading@11:     if (avio_rb16(s->pb) != 0x8000)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     c->header_size = avio_rb16(s->pb) + 4;
yading@11:     avio_seek(s->pb, -4, SEEK_CUR);
yading@11: 
yading@11:     avctx->extradata = av_mallocz(c->header_size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:     if (!avctx->extradata)
yading@11:         return AVERROR(ENOMEM);
yading@11:     if (avio_read(s->pb, avctx->extradata, c->header_size) < c->header_size) {
yading@11:         av_freep(&avctx->extradata);
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     avctx->extradata_size = c->header_size;
yading@11: 
yading@11:     ret = avpriv_adx_decode_header(avctx, avctx->extradata,
yading@11:                                    avctx->extradata_size, &c->header_size,
yading@11:                                    NULL);
yading@11:     if (ret)
yading@11:         return ret;
yading@11: 
yading@11:     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->codec_id    = s->iformat->raw_codec_id;
yading@11: 
yading@11:     avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_adx_demuxer = {
yading@11:     .name           = "adx",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("CRI ADX"),
yading@11:     .priv_data_size = sizeof(ADXDemuxerContext),
yading@11:     .read_header    = adx_read_header,
yading@11:     .read_packet    = adx_read_packet,
yading@11:     .extensions     = "adx",
yading@11:     .raw_codec_id   = AV_CODEC_ID_ADPCM_ADX,
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11: };