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Diffstat (limited to 'ffmpeg/libavformat/soxdec.c')
| -rw-r--r-- | ffmpeg/libavformat/soxdec.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/soxdec.c b/ffmpeg/libavformat/soxdec.c new file mode 100644 index 0000000..aec4284 --- /dev/null +++ b/ffmpeg/libavformat/soxdec.c @@ -0,0 +1,134 @@ +/* + * SoX native format demuxer + * 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 demuxer + * @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 "internal.h" +#include "pcm.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) +{ + AVIOContext *pb = s->pb; + unsigned header_size, comment_size; + double sample_rate, sample_rate_frac; + AVStream *st; + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + + if (avio_rl32(pb) == SOX_TAG) { + st->codec->codec_id = AV_CODEC_ID_PCM_S32LE; + header_size = avio_rl32(pb); + avio_skip(pb, 8); /* sample count */ + sample_rate = av_int2double(avio_rl64(pb)); + st->codec->channels = avio_rl32(pb); + comment_size = avio_rl32(pb); + } else { + st->codec->codec_id = AV_CODEC_ID_PCM_S32BE; + header_size = avio_rb32(pb); + avio_skip(pb, 8); /* sample count */ + sample_rate = av_int2double(avio_rb64(pb)); + st->codec->channels = avio_rb32(pb); + comment_size = avio_rb32(pb); + } + + if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) { + av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size); + return AVERROR_INVALIDDATA; + } + + if (sample_rate <= 0 || sample_rate > INT_MAX) { + av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate); + return AVERROR_INVALIDDATA; + } + + 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 AVERROR_INVALIDDATA; + } + + if (comment_size && comment_size < UINT_MAX) { + char *comment = av_malloc(comment_size+1); + if(!comment) + return AVERROR(ENOMEM); + if (avio_read(pb, comment, comment_size) != comment_size) { + av_freep(&comment); + return AVERROR(EIO); + } + comment[comment_size] = 0; + + av_dict_set(&s->metadata, "comment", comment, + AV_DICT_DONT_STRDUP_VAL); + } + + avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size); + + st->codec->sample_rate = sample_rate; + st->codec->bits_per_coded_sample = 32; + st->codec->bit_rate = st->codec->sample_rate * + st->codec->bits_per_coded_sample * + st->codec->channels; + st->codec->block_align = st->codec->bits_per_coded_sample * + st->codec->channels / 8; + + avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); + + return 0; +} + +AVInputFormat ff_sox_demuxer = { + .name = "sox", + .long_name = NULL_IF_CONFIG_SMALL("SoX native"), + .read_probe = sox_probe, + .read_header = sox_read_header, + .read_packet = ff_pcm_read_packet, + .read_seek = ff_pcm_read_seek, +}; |