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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * Copyright (c) 2011 Justin Ruggles |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | /** |
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| 22 | * @file |
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| 23 | * CRI ADX demuxer |
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| 24 | */ |
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| 25 | |||
| 26 | #include "libavutil/intreadwrite.h" |
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| 27 | #include "libavcodec/adx.h" |
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| 28 | #include "avformat.h" |
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| 29 | #include "internal.h" |
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| 30 | |||
| 31 | #define BLOCK_SIZE 18 |
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| 32 | #define BLOCK_SAMPLES 32 |
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| 33 | |||
| 34 | typedef struct ADXDemuxerContext { |
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| 35 | int header_size; |
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| 36 | } ADXDemuxerContext; |
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| 37 | |||
| 38 | static int adx_read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 39 | { |
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| 40 | ADXDemuxerContext *c = s->priv_data; |
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| 41 | AVCodecContext *avctx = s->streams[0]->codec; |
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| 42 | int ret, size; |
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| 43 | |||
| 44 | size = BLOCK_SIZE * avctx->channels; |
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| 45 | |||
| 46 | pkt->pos = avio_tell(s->pb); |
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| 47 | pkt->stream_index = 0; |
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| 48 | |||
| 49 | ret = av_get_packet(s->pb, pkt, size); |
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| 50 | if (ret != size) { |
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| 51 | av_free_packet(pkt); |
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| 52 | return ret < 0 ? ret : AVERROR(EIO); |
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| 53 | } |
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| 54 | if (AV_RB16(pkt->data) & 0x8000) { |
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| 55 | av_free_packet(pkt); |
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| 56 | return AVERROR_EOF; |
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| 57 | } |
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| 58 | pkt->size = size; |
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| 59 | pkt->duration = 1; |
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| 60 | pkt->pts = (pkt->pos - c->header_size) / size; |
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| 61 | |||
| 62 | return 0; |
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| 63 | } |
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| 64 | |||
| 65 | static int adx_read_header(AVFormatContext *s) |
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| 66 | { |
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| 67 | ADXDemuxerContext *c = s->priv_data; |
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| 68 | AVCodecContext *avctx; |
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| 69 | int ret; |
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| 70 | |||
| 71 | AVStream *st = avformat_new_stream(s, NULL); |
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| 72 | if (!st) |
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| 73 | return AVERROR(ENOMEM); |
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| 74 | avctx = s->streams[0]->codec; |
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| 75 | |||
| 76 | if (avio_rb16(s->pb) != 0x8000) |
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| 77 | return AVERROR_INVALIDDATA; |
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| 78 | c->header_size = avio_rb16(s->pb) + 4; |
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| 79 | avio_seek(s->pb, -4, SEEK_CUR); |
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| 80 | |||
| 81 | if (ff_alloc_extradata(avctx, c->header_size)) |
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| 82 | return AVERROR(ENOMEM); |
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| 83 | if (avio_read(s->pb, avctx->extradata, c->header_size) < c->header_size) { |
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| 84 | av_freep(&avctx->extradata); |
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| 85 | return AVERROR(EIO); |
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| 86 | } |
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| 87 | avctx->extradata_size = c->header_size; |
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| 88 | |||
| 89 | ret = avpriv_adx_decode_header(avctx, avctx->extradata, |
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| 90 | avctx->extradata_size, &c->header_size, |
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| 91 | NULL); |
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| 92 | if (ret) |
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| 93 | return ret; |
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| 94 | |||
| 95 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 96 | st->codec->codec_id = s->iformat->raw_codec_id; |
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| 97 | |||
| 98 | avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate); |
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| 99 | |||
| 100 | return 0; |
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| 101 | } |
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| 102 | |||
| 103 | AVInputFormat ff_adx_demuxer = { |
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| 104 | .name = "adx", |
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| 105 | .long_name = NULL_IF_CONFIG_SMALL("CRI ADX"), |
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| 106 | .priv_data_size = sizeof(ADXDemuxerContext), |
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| 107 | .read_header = adx_read_header, |
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| 108 | .read_packet = adx_read_packet, |
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| 109 | .extensions = "adx", |
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| 110 | .raw_codec_id = AV_CODEC_ID_ADPCM_ADX, |
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| 111 | .flags = AVFMT_GENERIC_INDEX, |
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| 112 | }; |