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126 lines
3.5 KiB
126 lines
3.5 KiB
/* |
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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 FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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* SoX native format muxer |
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* @file |
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* @author Daniel Verkamp |
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* @sa 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 "avformat.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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ByteIOContext *pb = s->pb; |
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AVCodecContext *enc = s->streams[0]->codec; |
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AVMetadataTag *comment; |
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size_t comment_len = 0, comment_size; |
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comment = av_metadata_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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put_tag(pb, ".SoX"); |
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put_le32(pb, sox->header_size); |
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put_le64(pb, 0); /* number of samples */ |
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put_le64(pb, av_dbl2int(enc->sample_rate)); |
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put_le32(pb, enc->channels); |
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put_le32(pb, comment_size); |
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} else if (enc->codec_id == CODEC_ID_PCM_S32BE) { |
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put_tag(pb, "XoS."); |
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put_be32(pb, sox->header_size); |
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put_be64(pb, 0); /* number of samples */ |
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put_be64(pb, av_dbl2int(enc->sample_rate)); |
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put_be32(pb, enc->channels); |
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put_be32(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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put_buffer(pb, comment->value, comment_len); |
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for ( ; comment_size > comment_len; comment_len++) |
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put_byte(pb, 0); |
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put_flush_packet(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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ByteIOContext *pb = s->pb; |
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put_buffer(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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ByteIOContext *pb = s->pb; |
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AVCodecContext *enc = s->streams[0]->codec; |
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if (!url_is_streamed(s->pb)) { |
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/* update number of samples */ |
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int64_t file_size = url_ftell(pb); |
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int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL; |
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url_fseek(pb, 8, SEEK_SET); |
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if (enc->codec_id == CODEC_ID_PCM_S32LE) { |
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put_le64(pb, num_samples); |
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} else |
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put_be64(pb, num_samples); |
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url_fseek(pb, file_size, SEEK_SET); |
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put_flush_packet(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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"sox", |
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NULL_IF_CONFIG_SMALL("SoX native format"), |
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NULL, |
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"sox", |
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sizeof(SoXContext), |
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CODEC_ID_PCM_S32LE, |
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CODEC_ID_NONE, |
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sox_write_header, |
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sox_write_packet, |
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sox_write_trailer, |
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};
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