--- /dev/null
+/*
+ * 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
+
+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);
+ data = data ^ (key = data ^ 0x52656453);
+ AV_WB32(header, data);
+ key = (key << 11) | (key >> 21);
+
+ data = AV_RB32(p->buf + 4) ^ (((key << 3) | (key >> 29)) + 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;
+ AVCodecContext *codec;
+ GetByteContext gbc;
+ int i, coef_off;
+ uint32_t key, data;
+ uint8_t *header, *pbc;
+ AVStream *st;
+
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+ codec = st->codec;
+
+ header = av_malloc(HEADER_SIZE);
+ if (!header)
+ return AVERROR(ENOMEM);
+ pbc = header;
+
+ /* Decrypt header */
+ data = avio_rb32(pb);
+ data = data ^ (key = data ^ 0x52656453);
+ bytestream_put_be32(&pbc, data);
+ key = (key << 11) | (key >> 21);
+
+ for (i = 4; i < HEADER_SIZE; i += 4) {
+ data = avio_rb32(pb) ^ (key = ((key << 3) | (key >> 29)) + key);
+ bytestream_put_be32(&pbc, data);
+ }
+
+ codec->codec_id = AV_CODEC_ID_ADPCM_THP;
+ codec->codec_type = AVMEDIA_TYPE_AUDIO;
+
+ bytestream2_init(&gbc, header, HEADER_SIZE);
+ bytestream2_seek(&gbc, 0x3c, SEEK_SET);
+ codec->sample_rate = bytestream2_get_be32u(&gbc);
+ if (codec->sample_rate <= 0 || codec->sample_rate > 96000) {
+ av_log(s, AV_LOG_ERROR, "Invalid sample rate: %d\n", codec->sample_rate);
+ return AVERROR_INVALIDDATA;
+ }
+
+ st->duration = bytestream2_get_be32u(&gbc) * 14;
+ redspark->samples_count = 0;
+ bytestream2_skipu(&gbc, 10);
+ codec->channels = bytestream2_get_byteu(&gbc);
+ if (!codec->channels)
+ return AVERROR_INVALIDDATA;
+
+ coef_off = 0x54 + codec->channels * 8;
+ if (bytestream2_get_byteu(&gbc)) // Loop flag
+ coef_off += 16;
+
+ codec->extradata_size = 32 * codec->channels;
+ codec->extradata = av_malloc(codec->extradata_size);
+ if (!codec->extradata)
+ return AVERROR(ENOMEM);
+
+ /* Get the ADPCM table */
+ bytestream2_seek(&gbc, coef_off, SEEK_SET);
+ for (i = 0; i < codec->channels; i++) {
+ if (bytestream2_get_bufferu(&gbc, codec->extradata + i * 32, 32) != 32)
+ return AVERROR_INVALIDDATA;
+ bytestream2_skipu(&gbc, 14);
+ }
+
+ avpriv_set_pts_info(st, 64, 1, codec->sample_rate);
+
+ return 0;
+}
+
+static int redspark_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ AVCodecContext *codec = s->streams[0]->codec;
+ RedSparkContext *redspark = s->priv_data;
+ uint32_t size = 8 * codec->channels;
+ int ret;
+
+ if (url_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_free_packet(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",
+};
projects / ffmpeg / commitdiff