| 0,0 → 1,112 |
|---|
| /* |
| * Copyright (c) 2011 Justin Ruggles |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * CRI ADX demuxer |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "libavcodec/adx.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| #define BLOCK_SIZE 18 |
| #define BLOCK_SAMPLES 32 |
| |
| typedef struct ADXDemuxerContext { |
| int header_size; |
| } ADXDemuxerContext; |
| |
| static int adx_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| ADXDemuxerContext *c = s->priv_data; |
| AVCodecContext *avctx = s->streams[0]->codec; |
| int ret, size; |
| |
| size = BLOCK_SIZE * avctx->channels; |
| |
| pkt->pos = avio_tell(s->pb); |
| pkt->stream_index = 0; |
| |
| ret = av_get_packet(s->pb, pkt, size); |
| if (ret != size) { |
| av_free_packet(pkt); |
| return ret < 0 ? ret : AVERROR(EIO); |
| } |
| if (AV_RB16(pkt->data) & 0x8000) { |
| av_free_packet(pkt); |
| return AVERROR_EOF; |
| } |
| pkt->size = size; |
| pkt->duration = 1; |
| pkt->pts = (pkt->pos - c->header_size) / size; |
| |
| return 0; |
| } |
| |
| static int adx_read_header(AVFormatContext *s) |
| { |
| ADXDemuxerContext *c = s->priv_data; |
| AVCodecContext *avctx; |
| int ret; |
| |
| AVStream *st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| avctx = s->streams[0]->codec; |
| |
| if (avio_rb16(s->pb) != 0x8000) |
| return AVERROR_INVALIDDATA; |
| c->header_size = avio_rb16(s->pb) + 4; |
| avio_seek(s->pb, -4, SEEK_CUR); |
| |
| if (ff_alloc_extradata(avctx, c->header_size)) |
| return AVERROR(ENOMEM); |
| if (avio_read(s->pb, avctx->extradata, c->header_size) < c->header_size) { |
| av_freep(&avctx->extradata); |
| return AVERROR(EIO); |
| } |
| avctx->extradata_size = c->header_size; |
| |
| ret = avpriv_adx_decode_header(avctx, avctx->extradata, |
| avctx->extradata_size, &c->header_size, |
| NULL); |
| if (ret) |
| return ret; |
| |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_id = s->iformat->raw_codec_id; |
| |
| avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate); |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_adx_demuxer = { |
| .name = "adx", |
| .long_name = NULL_IF_CONFIG_SMALL("CRI ADX"), |
| .priv_data_size = sizeof(ADXDemuxerContext), |
| .read_header = adx_read_header, |
| .read_packet = adx_read_packet, |
| .extensions = "adx", |
| .raw_codec_id = AV_CODEC_ID_ADPCM_ADX, |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |