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Diffstat (limited to 'libavformat/redspark.c')
-rw-r--r-- | libavformat/redspark.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/libavformat/redspark.c b/libavformat/redspark.c new file mode 100644 index 0000000000..c247046584 --- /dev/null +++ b/libavformat/redspark.c @@ -0,0 +1,162 @@ +/* + * RedSpark demuxer + * Copyright (c) 2013 James Almer + * + * 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 + */ + +#include "libavcodec/bytestream.h" +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "avio.h" +#include "internal.h" + +#define HEADER_SIZE 4096 +#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) + +typedef struct RedSparkContext { + int samples_count; +} RedSparkContext; + +static int redspark_probe(AVProbeData *p) +{ + uint32_t key, data; + uint8_t header[8]; + + /* Decrypt first 8 bytes of the header */ + data = AV_RB32(p->buf); + key = data ^ 0x52656453; + data ^= key; + AV_WB32(header, data); + key = rol(key, 11); + + key += rol(key, 3); + data = AV_RB32(p->buf + 4) ^ key; + AV_WB32(header + 4, data); + + if (AV_RB64(header) == AV_RB64("RedSpark")) + return AVPROBE_SCORE_MAX; + + return 0; +} + +static int redspark_read_header(AVFormatContext *s) +{ + AVIOContext *pb = s->pb; + RedSparkContext *redspark = s->priv_data; + AVCodecParameters *par; + GetByteContext gbc; + int i, coef_off, ret = 0; + uint32_t key, data; + uint8_t header[HEADER_SIZE]; + AVStream *st; + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + par = st->codecpar; + + /* Decrypt header */ + data = avio_rb32(pb); + key = data ^ 0x52656453; + data ^= key; + AV_WB32(header, data); + key = rol(key, 11); + + for (i = 4; i < HEADER_SIZE; i += 4) { + key += rol(key, 3); + data = avio_rb32(pb) ^ key; + AV_WB32(header + i, data); + } + + par->codec_id = AV_CODEC_ID_ADPCM_THP; + par->codec_type = AVMEDIA_TYPE_AUDIO; + + bytestream2_init(&gbc, header, HEADER_SIZE); + bytestream2_seek(&gbc, 0x3c, SEEK_SET); + par->sample_rate = bytestream2_get_be32u(&gbc); + if (par->sample_rate <= 0 || par->sample_rate > 96000) { + av_log(s, AV_LOG_ERROR, "Invalid sample rate: %d\n", par->sample_rate); + return AVERROR_INVALIDDATA; + } + + st->duration = bytestream2_get_be32u(&gbc) * 14; + redspark->samples_count = 0; + bytestream2_skipu(&gbc, 10); + par->channels = bytestream2_get_byteu(&gbc); + if (!par->channels) { + return AVERROR_INVALIDDATA; + } + + coef_off = 0x54 + par->channels * 8; + if (bytestream2_get_byteu(&gbc)) // Loop flag + coef_off += 16; + + if (coef_off + par->channels * (32 + 14) > HEADER_SIZE) { + return AVERROR_INVALIDDATA; + } + + if (ff_alloc_extradata(par, 32 * par->channels)) { + return AVERROR_INVALIDDATA; + } + + /* Get the ADPCM table */ + bytestream2_seek(&gbc, coef_off, SEEK_SET); + for (i = 0; i < par->channels; i++) { + if (bytestream2_get_bufferu(&gbc, par->extradata + i * 32, 32) != 32) { + return AVERROR_INVALIDDATA; + } + bytestream2_skipu(&gbc, 14); + } + + avpriv_set_pts_info(st, 64, 1, par->sample_rate); + + return ret; +} + +static int redspark_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + AVCodecParameters *par = s->streams[0]->codecpar; + RedSparkContext *redspark = s->priv_data; + uint32_t size = 8 * par->channels; + int ret; + + if (avio_feof(s->pb) || redspark->samples_count == s->streams[0]->duration) + return AVERROR_EOF; + + ret = av_get_packet(s->pb, pkt, size); + if (ret != size) { + av_packet_unref(pkt); + return AVERROR(EIO); + } + + pkt->duration = 14; + redspark->samples_count += pkt->duration; + pkt->stream_index = 0; + + return ret; +} + +AVInputFormat ff_redspark_demuxer = { + .name = "redspark", + .long_name = NULL_IF_CONFIG_SMALL("RedSpark"), + .priv_data_size = sizeof(RedSparkContext), + .read_probe = redspark_probe, + .read_header = redspark_read_header, + .read_packet = redspark_read_packet, + .extensions = "rsd", +}; |