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libavformat/soxenc.c

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00001 /*
00002  * SoX native format muxer
00003  * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
00004  *
00005  * Based on libSoX sox-fmt.c
00006  * Copyright (c) 2008 robs@users.sourceforge.net
00007  *
00008  * This file is part of FFmpeg.
00009  *
00010  * FFmpeg is free software; you can redistribute it and/or
00011  * modify it under the terms of the GNU Lesser General Public
00012  * License as published by the Free Software Foundation; either
00013  * version 2.1 of the License, or (at your option) any later version.
00014  *
00015  * FFmpeg is distributed in the hope that it will be useful,
00016  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00017  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018  * Lesser General Public License for more details.
00019  *
00020  * You should have received a copy of the GNU Lesser General Public
00021  * License along with FFmpeg; if not, write to the Free Software
00022  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00023  */
00024 
00032 #include "libavutil/intreadwrite.h"
00033 #include "avformat.h"
00034 #include "sox.h"
00035 
00036 typedef struct {
00037     int64_t header_size;
00038 } SoXContext;
00039 
00040 static int sox_write_header(AVFormatContext *s)
00041 {
00042     SoXContext *sox = s->priv_data;
00043     ByteIOContext *pb = s->pb;
00044     AVCodecContext *enc = s->streams[0]->codec;
00045     AVMetadataTag *comment;
00046     size_t comment_len = 0, comment_size;
00047 
00048     comment = av_metadata_get(s->metadata, "comment", NULL, 0);
00049     if (comment)
00050         comment_len = strlen(comment->value);
00051     comment_size = (comment_len + 7) & ~7;
00052 
00053     sox->header_size = SOX_FIXED_HDR + comment_size;
00054 
00055     if (enc->codec_id == CODEC_ID_PCM_S32LE) {
00056         put_tag(pb, ".SoX");
00057         put_le32(pb, sox->header_size);
00058         put_le64(pb, 0); /* number of samples */
00059         put_le64(pb, av_dbl2int(enc->sample_rate));
00060         put_le32(pb, enc->channels);
00061         put_le32(pb, comment_size);
00062     } else if (enc->codec_id == CODEC_ID_PCM_S32BE) {
00063         put_tag(pb, "XoS.");
00064         put_be32(pb, sox->header_size);
00065         put_be64(pb, 0); /* number of samples */
00066         put_be64(pb, av_dbl2int(enc->sample_rate));
00067         put_be32(pb, enc->channels);
00068         put_be32(pb, comment_size);
00069     } else {
00070         av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n");
00071         return -1;
00072     }
00073 
00074     if (comment_len)
00075         put_buffer(pb, comment->value, comment_len);
00076 
00077     for ( ; comment_size > comment_len; comment_len++)
00078         put_byte(pb, 0);
00079 
00080     put_flush_packet(pb);
00081 
00082     return 0;
00083 }
00084 
00085 static int sox_write_packet(AVFormatContext *s, AVPacket *pkt)
00086 {
00087     ByteIOContext *pb = s->pb;
00088     put_buffer(pb, pkt->data, pkt->size);
00089     return 0;
00090 }
00091 
00092 static int sox_write_trailer(AVFormatContext *s)
00093 {
00094     SoXContext *sox = s->priv_data;
00095     ByteIOContext *pb = s->pb;
00096     AVCodecContext *enc = s->streams[0]->codec;
00097 
00098     if (!url_is_streamed(s->pb)) {
00099         /* update number of samples */
00100         int64_t file_size = url_ftell(pb);
00101         int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL;
00102         url_fseek(pb, 8, SEEK_SET);
00103         if (enc->codec_id == CODEC_ID_PCM_S32LE) {
00104             put_le64(pb, num_samples);
00105         } else
00106             put_be64(pb, num_samples);
00107         url_fseek(pb, file_size, SEEK_SET);
00108 
00109         put_flush_packet(pb);
00110     }
00111 
00112     return 0;
00113 }
00114 
00115 AVOutputFormat sox_muxer = {
00116     "sox",
00117     NULL_IF_CONFIG_SMALL("SoX native format"),
00118     NULL,
00119     "sox",
00120     sizeof(SoXContext),
00121     CODEC_ID_PCM_S32LE,
00122     CODEC_ID_NONE,
00123     sox_write_header,
00124     sox_write_packet,
00125     sox_write_trailer,
00126 };

Generated on Fri Sep 16 2011 17:17:51 for FFmpeg by  doxygen 1.7.1