mirror of https://github.com/FFmpeg/FFmpeg.git
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27360ccc5e
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a17c3c7d15
7 changed files with 117 additions and 1 deletions
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/*
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* Copyright (c) 2011 Justin Ruggles |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file |
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* CRI ADX demuxer |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "libavcodec/adx.h" |
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#include "avformat.h" |
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#define BLOCK_SIZE 18 |
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#define BLOCK_SAMPLES 32 |
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typedef struct ADXDemuxerContext { |
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int header_size; |
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} ADXDemuxerContext; |
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static int adx_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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ADXDemuxerContext *c = s->priv_data; |
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AVCodecContext *avctx = s->streams[0]->codec; |
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int ret, size; |
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size = BLOCK_SIZE * avctx->channels; |
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pkt->pos = avio_tell(s->pb); |
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pkt->stream_index = 0; |
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ret = av_get_packet(s->pb, pkt, size); |
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if (ret != size) { |
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av_free_packet(pkt); |
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return ret < 0 ? ret : AVERROR(EIO); |
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} |
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if (AV_RB16(pkt->data) & 0x8000) { |
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av_free_packet(pkt); |
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return AVERROR_EOF; |
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} |
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pkt->size = size; |
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pkt->duration = 1; |
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pkt->pts = (pkt->pos - c->header_size) / size; |
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return 0; |
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} |
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static int adx_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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ADXDemuxerContext *c = s->priv_data; |
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AVCodecContext *avctx; |
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int ret; |
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AVStream *st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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avctx = s->streams[0]->codec; |
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if (avio_rb16(s->pb) != 0x8000) |
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return AVERROR_INVALIDDATA; |
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c->header_size = avio_rb16(s->pb) + 4; |
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avio_seek(s->pb, -4, SEEK_CUR); |
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avctx->extradata = av_mallocz(c->header_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!avctx->extradata) |
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return AVERROR(ENOMEM); |
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if (avio_read(s->pb, avctx->extradata, c->header_size) < c->header_size) { |
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av_freep(&avctx->extradata); |
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return AVERROR(EIO); |
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} |
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avctx->extradata_size = c->header_size; |
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ret = ff_adx_decode_header(avctx, avctx->extradata, avctx->extradata_size, |
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&c->header_size, NULL); |
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if (ret) |
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return ret; |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = s->iformat->value; |
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av_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate); |
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return 0; |
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} |
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AVInputFormat ff_adx_demuxer = { |
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.name = "adx", |
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.long_name = NULL_IF_CONFIG_SMALL("CRI ADX"), |
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.priv_data_size = sizeof(ADXDemuxerContext), |
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.read_header = adx_read_header, |
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.read_packet = adx_read_packet, |
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.extensions = "adx", |
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.value = CODEC_ID_ADPCM_ADX, |
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}; |
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