| 1 | /* |
| 2 | * Creative Voice File muxer. |
| 3 | * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "voc.h" |
| 23 | #include "internal.h" |
| 24 | |
| 25 | |
| 26 | typedef struct voc_enc_context { |
| 27 | int param_written; |
| 28 | } VocEncContext; |
| 29 | |
| 30 | static int voc_write_header(AVFormatContext *s) |
| 31 | { |
| 32 | AVIOContext *pb = s->pb; |
| 33 | AVCodecContext *enc = s->streams[0]->codec; |
| 34 | const int header_size = 26; |
| 35 | const int version = 0x0114; |
| 36 | |
| 37 | if (s->nb_streams != 1 |
| 38 | || s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO) |
| 39 | return AVERROR_PATCHWELCOME; |
| 40 | |
| 41 | if (!enc->codec_tag && enc->codec_id != AV_CODEC_ID_PCM_U8) { |
| 42 | av_log(s, AV_LOG_ERROR, "unsupported codec\n"); |
| 43 | return AVERROR(EINVAL); |
| 44 | } |
| 45 | |
| 46 | avio_write(pb, ff_voc_magic, sizeof(ff_voc_magic) - 1); |
| 47 | avio_wl16(pb, header_size); |
| 48 | avio_wl16(pb, version); |
| 49 | avio_wl16(pb, ~version + 0x1234); |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static int voc_write_packet(AVFormatContext *s, AVPacket *pkt) |
| 55 | { |
| 56 | VocEncContext *voc = s->priv_data; |
| 57 | AVCodecContext *enc = s->streams[0]->codec; |
| 58 | AVIOContext *pb = s->pb; |
| 59 | |
| 60 | if (!voc->param_written) { |
| 61 | if (enc->codec_tag > 3) { |
| 62 | avio_w8(pb, VOC_TYPE_NEW_VOICE_DATA); |
| 63 | avio_wl24(pb, pkt->size + 12); |
| 64 | avio_wl32(pb, enc->sample_rate); |
| 65 | avio_w8(pb, enc->bits_per_coded_sample); |
| 66 | avio_w8(pb, enc->channels); |
| 67 | avio_wl16(pb, enc->codec_tag); |
| 68 | avio_wl32(pb, 0); |
| 69 | } else { |
| 70 | if (s->streams[0]->codec->channels > 1) { |
| 71 | avio_w8(pb, VOC_TYPE_EXTENDED); |
| 72 | avio_wl24(pb, 4); |
| 73 | avio_wl16(pb, 65536-(256000000 + enc->sample_rate*enc->channels/2)/(enc->sample_rate*enc->channels)); |
| 74 | avio_w8(pb, enc->codec_tag); |
| 75 | avio_w8(pb, enc->channels - 1); |
| 76 | } |
| 77 | avio_w8(pb, VOC_TYPE_VOICE_DATA); |
| 78 | avio_wl24(pb, pkt->size + 2); |
| 79 | avio_w8(pb, 256 - (1000000 + enc->sample_rate/2) / enc->sample_rate); |
| 80 | avio_w8(pb, enc->codec_tag); |
| 81 | } |
| 82 | voc->param_written = 1; |
| 83 | } else { |
| 84 | avio_w8(pb, VOC_TYPE_VOICE_DATA_CONT); |
| 85 | avio_wl24(pb, pkt->size); |
| 86 | } |
| 87 | |
| 88 | avio_write(pb, pkt->data, pkt->size); |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | static int voc_write_trailer(AVFormatContext *s) |
| 93 | { |
| 94 | avio_w8(s->pb, 0); |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | AVOutputFormat ff_voc_muxer = { |
| 99 | .name = "voc", |
| 100 | .long_name = NULL_IF_CONFIG_SMALL("Creative Voice"), |
| 101 | .mime_type = "audio/x-voc", |
| 102 | .extensions = "voc", |
| 103 | .priv_data_size = sizeof(VocEncContext), |
| 104 | .audio_codec = AV_CODEC_ID_PCM_S16LE, |
| 105 | .video_codec = AV_CODEC_ID_NONE, |
| 106 | .write_header = voc_write_header, |
| 107 | .write_packet = voc_write_packet, |
| 108 | .write_trailer = voc_write_trailer, |
| 109 | .codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 }, |
| 110 | .flags = AVFMT_NOTIMESTAMPS, |
| 111 | }; |