| 1 | /* |
| 2 | * SoX native format muxer |
| 3 | * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu> |
| 4 | * |
| 5 | * Based on libSoX sox-fmt.c |
| 6 | * Copyright (c) 2008 robs@users.sourceforge.net |
| 7 | * |
| 8 | * This file is part of FFmpeg. |
| 9 | * |
| 10 | * FFmpeg is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU Lesser General Public |
| 12 | * License as published by the Free Software Foundation; either |
| 13 | * version 2.1 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * FFmpeg is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * Lesser General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Lesser General Public |
| 21 | * License along with FFmpeg; if not, write to the Free Software |
| 22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 23 | */ |
| 24 | |
| 25 | /** |
| 26 | * @file |
| 27 | * SoX native format muxer |
| 28 | * @author Daniel Verkamp |
| 29 | * @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format |
| 30 | */ |
| 31 | |
| 32 | #include "libavutil/intreadwrite.h" |
| 33 | #include "libavutil/intfloat.h" |
| 34 | #include "libavutil/dict.h" |
| 35 | #include "avformat.h" |
| 36 | #include "avio_internal.h" |
| 37 | #include "rawenc.h" |
| 38 | #include "sox.h" |
| 39 | |
| 40 | typedef struct { |
| 41 | int64_t header_size; |
| 42 | } SoXContext; |
| 43 | |
| 44 | static int sox_write_header(AVFormatContext *s) |
| 45 | { |
| 46 | SoXContext *sox = s->priv_data; |
| 47 | AVIOContext *pb = s->pb; |
| 48 | AVCodecContext *enc = s->streams[0]->codec; |
| 49 | AVDictionaryEntry *comment; |
| 50 | size_t comment_len = 0, comment_size; |
| 51 | |
| 52 | comment = av_dict_get(s->metadata, "comment", NULL, 0); |
| 53 | if (comment) |
| 54 | comment_len = strlen(comment->value); |
| 55 | comment_size = FFALIGN(comment_len, 8); |
| 56 | |
| 57 | sox->header_size = SOX_FIXED_HDR + comment_size; |
| 58 | |
| 59 | if (enc->codec_id == AV_CODEC_ID_PCM_S32LE) { |
| 60 | ffio_wfourcc(pb, ".SoX"); |
| 61 | avio_wl32(pb, sox->header_size); |
| 62 | avio_wl64(pb, 0); /* number of samples */ |
| 63 | avio_wl64(pb, av_double2int(enc->sample_rate)); |
| 64 | avio_wl32(pb, enc->channels); |
| 65 | avio_wl32(pb, comment_size); |
| 66 | } else if (enc->codec_id == AV_CODEC_ID_PCM_S32BE) { |
| 67 | ffio_wfourcc(pb, "XoS."); |
| 68 | avio_wb32(pb, sox->header_size); |
| 69 | avio_wb64(pb, 0); /* number of samples */ |
| 70 | avio_wb64(pb, av_double2int(enc->sample_rate)); |
| 71 | avio_wb32(pb, enc->channels); |
| 72 | avio_wb32(pb, comment_size); |
| 73 | } else { |
| 74 | av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n"); |
| 75 | return AVERROR(EINVAL); |
| 76 | } |
| 77 | |
| 78 | if (comment_len) |
| 79 | avio_write(pb, comment->value, comment_len); |
| 80 | |
| 81 | ffio_fill(pb, 0, comment_size - comment_len); |
| 82 | |
| 83 | avio_flush(pb); |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static int sox_write_trailer(AVFormatContext *s) |
| 89 | { |
| 90 | SoXContext *sox = s->priv_data; |
| 91 | AVIOContext *pb = s->pb; |
| 92 | AVCodecContext *enc = s->streams[0]->codec; |
| 93 | |
| 94 | if (s->pb->seekable) { |
| 95 | /* update number of samples */ |
| 96 | int64_t file_size = avio_tell(pb); |
| 97 | int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL; |
| 98 | avio_seek(pb, 8, SEEK_SET); |
| 99 | if (enc->codec_id == AV_CODEC_ID_PCM_S32LE) { |
| 100 | avio_wl64(pb, num_samples); |
| 101 | } else |
| 102 | avio_wb64(pb, num_samples); |
| 103 | avio_seek(pb, file_size, SEEK_SET); |
| 104 | |
| 105 | avio_flush(pb); |
| 106 | } |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | AVOutputFormat ff_sox_muxer = { |
| 112 | .name = "sox", |
| 113 | .long_name = NULL_IF_CONFIG_SMALL("SoX native"), |
| 114 | .extensions = "sox", |
| 115 | .priv_data_size = sizeof(SoXContext), |
| 116 | .audio_codec = AV_CODEC_ID_PCM_S32LE, |
| 117 | .video_codec = AV_CODEC_ID_NONE, |
| 118 | .write_header = sox_write_header, |
| 119 | .write_packet = ff_raw_write_packet, |
| 120 | .write_trailer = sox_write_trailer, |
| 121 | .flags = AVFMT_NOTIMESTAMPS, |
| 122 | }; |