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Diffstat (limited to 'ffmpeg/libavformat/soxenc.c')
| -rw-r--r-- | ffmpeg/libavformat/soxenc.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/soxenc.c b/ffmpeg/libavformat/soxenc.c new file mode 100644 index 0000000..e219d75 --- /dev/null +++ b/ffmpeg/libavformat/soxenc.c @@ -0,0 +1,121 @@ +/* + * 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 FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; 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 "rawenc.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 = FFALIGN(comment_len, 8); + + sox->header_size = SOX_FIXED_HDR + comment_size; + + if (enc->codec_id == AV_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 == AV_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); + + ffio_fill(pb, 0, comment_size - comment_len); + + avio_flush(pb); + + 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 == AV_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"), + .extensions = "sox", + .priv_data_size = sizeof(SoXContext), + .audio_codec = AV_CODEC_ID_PCM_S32LE, + .video_codec = AV_CODEC_ID_NONE, + .write_header = sox_write_header, + .write_packet = ff_raw_write_packet, + .write_trailer = sox_write_trailer, +}; |