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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Electronic Arts .cdata file Demuxer |
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| 3 | * Copyright (c) 2007 Peter Ross |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * Electronic Arts cdata Format Demuxer |
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| 25 | * by Peter Ross (pross@xvid.org) |
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| 26 | * |
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| 27 | * Technical details here: |
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| 28 | * http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec |
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| 29 | */ |
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| 30 | |||
| 31 | #include "avformat.h" |
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| 32 | #include "internal.h" |
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| 33 | |||
| 34 | typedef struct { |
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| 35 | unsigned int channels; |
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| 36 | unsigned int audio_pts; |
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| 37 | } CdataDemuxContext; |
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| 38 | |||
| 39 | static int cdata_probe(AVProbeData *p) |
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| 40 | { |
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| 41 | const uint8_t *b = p->buf; |
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| 42 | |||
| 43 | if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C || b[1] == 0x14)) |
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| 44 | return AVPROBE_SCORE_MAX/8; |
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| 45 | return 0; |
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| 46 | } |
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| 47 | |||
| 48 | static int cdata_read_header(AVFormatContext *s) |
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| 49 | { |
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| 50 | CdataDemuxContext *cdata = s->priv_data; |
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| 51 | AVIOContext *pb = s->pb; |
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| 52 | unsigned int sample_rate, header; |
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| 53 | AVStream *st; |
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| 54 | int64_t channel_layout = 0; |
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| 55 | |||
| 56 | header = avio_rb16(pb); |
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| 57 | switch (header) { |
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| 58 | case 0x0400: cdata->channels = 1; break; |
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| 59 | case 0x0404: cdata->channels = 2; break; |
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| 60 | case 0x040C: cdata->channels = 4; channel_layout = AV_CH_LAYOUT_QUAD; break; |
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| 61 | case 0x0414: cdata->channels = 6; channel_layout = AV_CH_LAYOUT_5POINT1_BACK; break; |
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| 62 | default: |
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| 63 | av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header); |
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| 64 | return -1; |
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| 65 | }; |
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| 66 | |||
| 67 | sample_rate = avio_rb16(pb); |
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| 68 | avio_skip(pb, (avio_r8(pb) & 0x20) ? 15 : 11); |
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| 69 | |||
| 70 | st = avformat_new_stream(s, NULL); |
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| 71 | if (!st) |
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| 72 | return AVERROR(ENOMEM); |
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| 73 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 74 | st->codec->codec_tag = 0; /* no fourcc */ |
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| 75 | st->codec->codec_id = AV_CODEC_ID_ADPCM_EA_XAS; |
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| 76 | st->codec->channels = cdata->channels; |
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| 77 | st->codec->channel_layout = channel_layout; |
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| 78 | st->codec->sample_rate = sample_rate; |
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| 79 | avpriv_set_pts_info(st, 64, 1, sample_rate); |
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| 80 | |||
| 81 | cdata->audio_pts = 0; |
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| 82 | return 0; |
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| 83 | } |
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| 84 | |||
| 85 | static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 86 | { |
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| 87 | CdataDemuxContext *cdata = s->priv_data; |
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| 88 | int packet_size = 76*cdata->channels; |
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| 89 | |||
| 90 | int ret = av_get_packet(s->pb, pkt, packet_size); |
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| 91 | if (ret < 0) |
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| 92 | return ret; |
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| 93 | pkt->pts = cdata->audio_pts++; |
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| 94 | return 0; |
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| 95 | } |
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| 96 | |||
| 97 | AVInputFormat ff_ea_cdata_demuxer = { |
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| 98 | .name = "ea_cdata", |
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| 99 | .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"), |
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| 100 | .priv_data_size = sizeof(CdataDemuxContext), |
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| 101 | .read_probe = cdata_probe, |
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| 102 | .read_header = cdata_read_header, |
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| 103 | .read_packet = cdata_read_packet, |
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| 104 | .extensions = "cdata", |
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| 105 | }; |