| /* |
| * 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 "avformat.h" |
| #include "internal.h" |
| |
| #define BLOCK_SIZE 18 |
| #define BLOCK_SAMPLES 32 |
| |
| typedef struct ADXDemuxerContext { |
| int header_size; |
| } ADXDemuxerContext; |
| |
| static int adx_probe(const AVProbeData *p) |
| { |
| int offset; |
| if (AV_RB16(p->buf) != 0x8000) |
| return 0; |
| offset = AV_RB16(&p->buf[2]); |
| if ( offset < 8 |
| || offset > p->buf_size - 4 |
| || memcmp(p->buf + offset - 2, "(c)CRI", 6)) |
| return 0; |
| return AVPROBE_SCORE_MAX * 3 / 4; |
| } |
| |
| static int adx_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| ADXDemuxerContext *c = s->priv_data; |
| AVCodecParameters *par = s->streams[0]->codecpar; |
| int ret, size; |
| |
| if (avio_feof(s->pb)) |
| return AVERROR_EOF; |
| |
| if (par->channels <= 0) { |
| av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", par->channels); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| size = BLOCK_SIZE * par->channels; |
| |
| pkt->pos = avio_tell(s->pb); |
| pkt->stream_index = 0; |
| |
| ret = av_get_packet(s->pb, pkt, size * 128); |
| if (ret < 0) |
| return ret; |
| if ((ret % size) && ret >= size) { |
| size = ret - (ret % size); |
| av_shrink_packet(pkt, size); |
| pkt->flags &= ~AV_PKT_FLAG_CORRUPT; |
| } else if (ret < size) { |
| return AVERROR(EIO); |
| } else { |
| size = ret; |
| } |
| |
| pkt->duration = size / (BLOCK_SIZE * par->channels); |
| pkt->pts = (pkt->pos - c->header_size) / (BLOCK_SIZE * par->channels); |
| |
| return 0; |
| } |
| |
| static int adx_read_header(AVFormatContext *s) |
| { |
| ADXDemuxerContext *c = s->priv_data; |
| AVCodecParameters *par; |
| int ret; |
| AVStream *st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| par = s->streams[0]->codecpar; |
| |
| 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 ((ret = ff_get_extradata(s, par, s->pb, c->header_size)) < 0) |
| return ret; |
| |
| if (par->extradata_size < 12) { |
| av_log(s, AV_LOG_ERROR, "Invalid extradata size.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| par->channels = AV_RB8 (par->extradata + 7); |
| par->sample_rate = AV_RB32(par->extradata + 8); |
| |
| if (par->channels <= 0) { |
| av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", par->channels); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (par->sample_rate <= 0) { |
| av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", par->sample_rate); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| par->codec_type = AVMEDIA_TYPE_AUDIO; |
| par->codec_id = s->iformat->raw_codec_id; |
| par->bit_rate = (int64_t)par->sample_rate * par->channels * BLOCK_SIZE * 8LL / BLOCK_SAMPLES; |
| |
| avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, par->sample_rate); |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_adx_demuxer = { |
| .name = "adx", |
| .long_name = NULL_IF_CONFIG_SMALL("CRI ADX"), |
| .read_probe = adx_probe, |
| .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, |
| }; |