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https://github.com/FFmpeg/FFmpeg.git
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129 lines
3.8 KiB
C
129 lines
3.8 KiB
C
/*
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* SoX native format muxer
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* Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
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*
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* Based on libSoX sox-fmt.c
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* Copyright (c) 2008 robs@users.sourceforge.net
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* SoX native format muxer
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* @author Daniel Verkamp
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* @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavutil/intfloat_readwrite.h"
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#include "libavutil/dict.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "sox.h"
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typedef struct {
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int64_t header_size;
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} SoXContext;
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static int sox_write_header(AVFormatContext *s)
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{
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SoXContext *sox = s->priv_data;
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AVIOContext *pb = s->pb;
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AVCodecContext *enc = s->streams[0]->codec;
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AVDictionaryEntry *comment;
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size_t comment_len = 0, comment_size;
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comment = av_dict_get(s->metadata, "comment", NULL, 0);
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if (comment)
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comment_len = strlen(comment->value);
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comment_size = (comment_len + 7) & ~7;
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sox->header_size = SOX_FIXED_HDR + comment_size;
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if (enc->codec_id == CODEC_ID_PCM_S32LE) {
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ffio_wfourcc(pb, ".SoX");
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avio_wl32(pb, sox->header_size);
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avio_wl64(pb, 0); /* number of samples */
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avio_wl64(pb, av_dbl2int(enc->sample_rate));
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avio_wl32(pb, enc->channels);
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avio_wl32(pb, comment_size);
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} else if (enc->codec_id == CODEC_ID_PCM_S32BE) {
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ffio_wfourcc(pb, "XoS.");
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avio_wb32(pb, sox->header_size);
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avio_wb64(pb, 0); /* number of samples */
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avio_wb64(pb, av_dbl2int(enc->sample_rate));
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avio_wb32(pb, enc->channels);
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avio_wb32(pb, comment_size);
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} else {
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av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n");
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return -1;
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}
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if (comment_len)
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avio_write(pb, comment->value, comment_len);
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for ( ; comment_size > comment_len; comment_len++)
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avio_w8(pb, 0);
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avio_flush(pb);
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return 0;
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}
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static int sox_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVIOContext *pb = s->pb;
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avio_write(pb, pkt->data, pkt->size);
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return 0;
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}
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static int sox_write_trailer(AVFormatContext *s)
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{
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SoXContext *sox = s->priv_data;
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AVIOContext *pb = s->pb;
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AVCodecContext *enc = s->streams[0]->codec;
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if (s->pb->seekable) {
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/* update number of samples */
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int64_t file_size = avio_tell(pb);
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int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL;
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avio_seek(pb, 8, SEEK_SET);
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if (enc->codec_id == CODEC_ID_PCM_S32LE) {
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avio_wl64(pb, num_samples);
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} else
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avio_wb64(pb, num_samples);
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avio_seek(pb, file_size, SEEK_SET);
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avio_flush(pb);
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}
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return 0;
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}
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AVOutputFormat ff_sox_muxer = {
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.name = "sox",
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.long_name = NULL_IF_CONFIG_SMALL("SoX native format"),
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.extensions = "sox",
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.priv_data_size = sizeof(SoXContext),
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.audio_codec = CODEC_ID_PCM_S32LE,
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.video_codec = CODEC_ID_NONE,
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.write_header = sox_write_header,
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.write_packet = sox_write_packet,
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.write_trailer = sox_write_trailer,
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};
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