/* * SoX native format muxer * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu> * * Based on libSoX sox-fmt.c * Copyright (c) 2008 robs@users.sourceforge.net * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * SoX native format muxer * @author Daniel Verkamp * @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format */ #include "libavutil/intreadwrite.h" #include "libavutil/intfloat.h" #include "libavutil/dict.h" #include "avformat.h" #include "avio_internal.h" #include "sox.h" typedef struct { int64_t header_size; } SoXContext; static int sox_write_header(AVFormatContext *s) { SoXContext *sox = s->priv_data; AVIOContext *pb = s->pb; AVCodecContext *enc = s->streams[0]->codec; AVDictionaryEntry *comment; size_t comment_len = 0, comment_size; comment = av_dict_get(s->metadata, "comment", NULL, 0); if (comment) comment_len = strlen(comment->value); comment_size = (comment_len + 7) & ~7; sox->header_size = SOX_FIXED_HDR + comment_size; if (enc->codec_id == CODEC_ID_PCM_S32LE) { ffio_wfourcc(pb, ".SoX"); avio_wl32(pb, sox->header_size); avio_wl64(pb, 0); /* number of samples */ avio_wl64(pb, av_double2int(enc->sample_rate)); avio_wl32(pb, enc->channels); avio_wl32(pb, comment_size); } else if (enc->codec_id == CODEC_ID_PCM_S32BE) { ffio_wfourcc(pb, "XoS."); avio_wb32(pb, sox->header_size); avio_wb64(pb, 0); /* number of samples */ avio_wb64(pb, av_double2int(enc->sample_rate)); avio_wb32(pb, enc->channels); avio_wb32(pb, comment_size); } else { av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n"); return -1; } if (comment_len) avio_write(pb, comment->value, comment_len); for ( ; comment_size > comment_len; comment_len++) avio_w8(pb, 0); avio_flush(pb); return 0; } static int sox_write_packet(AVFormatContext *s, AVPacket *pkt) { AVIOContext *pb = s->pb; avio_write(pb, pkt->data, pkt->size); return 0; } static int sox_write_trailer(AVFormatContext *s) { SoXContext *sox = s->priv_data; AVIOContext *pb = s->pb; AVCodecContext *enc = s->streams[0]->codec; if (s->pb->seekable) { /* update number of samples */ int64_t file_size = avio_tell(pb); int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL; avio_seek(pb, 8, SEEK_SET); if (enc->codec_id == CODEC_ID_PCM_S32LE) { avio_wl64(pb, num_samples); } else avio_wb64(pb, num_samples); avio_seek(pb, file_size, SEEK_SET); avio_flush(pb); } return 0; } AVOutputFormat ff_sox_muxer = { .name = "sox", .long_name = NULL_IF_CONFIG_SMALL("SoX native format"), .extensions = "sox", .priv_data_size = sizeof(SoXContext), .audio_codec = CODEC_ID_PCM_S32LE, .video_codec = CODEC_ID_NONE, .write_header = sox_write_header, .write_packet = sox_write_packet, .write_trailer = sox_write_trailer, };