From cbfe5bee2e20df90c581937b2cb4b1535acbf726 Mon Sep 17 00:00:00 2001 From: Daniel Verkamp Date: Sat, 30 May 2009 18:51:15 +0000 Subject: Implement SoX native format muxer and demuxer. Patch by Daniel Verkamp $firstname@drv DOT nu. Originally committed as revision 18998 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/soxdec.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 libavformat/soxdec.c (limited to 'libavformat/soxdec.c') diff --git a/libavformat/soxdec.c b/libavformat/soxdec.c new file mode 100644 index 0000000000..0a30b9cb48 --- /dev/null +++ b/libavformat/soxdec.c @@ -0,0 +1,149 @@ +/* + * SoX native format demuxer + * Copyright (c) 2009 Daniel Verkamp + * + * 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 + */ + +/** + * SoX native format demuxer + * @file libavformat/soxdec.c + * @author Daniel Verkamp + * @sa http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format + */ + +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "raw.h" +#include "sox.h" + +static int sox_probe(AVProbeData *p) +{ + if (AV_RL32(p->buf) == SOX_TAG || AV_RB32(p->buf) == SOX_TAG) + return AVPROBE_SCORE_MAX; + return 0; +} + +static int sox_read_header(AVFormatContext *s, + AVFormatParameters *ap) +{ + ByteIOContext *pb = s->pb; + unsigned header_size, comment_size; + double sample_rate, sample_rate_frac; + AVStream *st; + + st = av_new_stream(s, 0); + if (!st) + return AVERROR(ENOMEM); + + st->codec->codec_type = CODEC_TYPE_AUDIO; + + if (get_le32(pb) == SOX_TAG) { + st->codec->codec_id = CODEC_ID_PCM_S32LE; + header_size = get_le32(pb); + url_fskip(pb, 8); /* sample count */ + sample_rate = av_int2dbl(get_le64(pb)); + st->codec->channels = get_le32(pb); + comment_size = get_le32(pb); + } else { + st->codec->codec_id = CODEC_ID_PCM_S32BE; + header_size = get_be32(pb); + url_fskip(pb, 8); /* sample count */ + sample_rate = av_int2dbl(get_be64(pb)); + st->codec->channels = get_be32(pb); + comment_size = get_be32(pb); + } + + if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) { + av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size); + return -1; + } + + if (sample_rate <= 0 || sample_rate > INT_MAX) { + av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate); + return -1; + } + + sample_rate_frac = sample_rate - floor(sample_rate); + if (sample_rate_frac) + av_log(s, AV_LOG_WARNING, + "truncating fractional part of sample rate (%f)\n", + sample_rate_frac); + + if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size + || st->codec->channels > 65535) /* Reserve top 16 bits */ { + av_log(s, AV_LOG_ERROR, "invalid header\n"); + return -1; + } + + if (comment_size && + comment_size + FF_INPUT_BUFFER_PADDING_SIZE >= comment_size) { + char *comment = av_mallocz(comment_size + FF_INPUT_BUFFER_PADDING_SIZE); + if (get_buffer(pb, comment, comment_size) != comment_size) { + av_freep(&comment); + return AVERROR_IO; + } + av_metadata_set(&s->metadata, "comment", comment); + av_freep(&comment); + } + + url_fskip(pb, header_size - SOX_FIXED_HDR - comment_size); + + st->codec->sample_rate = sample_rate; + st->codec->sample_fmt = SAMPLE_FMT_S32; + st->codec->bits_per_coded_sample = 32; + st->codec->bit_rate = st->codec->sample_rate * + st->codec->bits_per_coded_sample * + st->codec->channels; + + av_set_pts_info(st, 64, 1, st->codec->sample_rate); + + return 0; +} + +#define MAX_SIZE 4096 + +static int sox_read_packet(AVFormatContext *s, + AVPacket *pkt) +{ + int ret; + + if (url_feof(s->pb)) + return AVERROR_EOF; + + ret = av_get_packet(s->pb, pkt, MAX_SIZE); + if (ret < 0) + return AVERROR(EIO); + pkt->stream_index = 0; + pkt->size = ret; + + return 0; +} + +AVInputFormat sox_demuxer = { + "sox", + NULL_IF_CONFIG_SMALL("SoX native format"), + 0, + sox_probe, + sox_read_header, + sox_read_packet, + NULL, + pcm_read_seek, +}; -- cgit v1.2.3