|
|
@@ -0,0 +1,173 @@
|
|
|
+/*
|
|
|
+ * RKA demuxer
|
|
|
+ * Copyright (c) 2023 Paul B Mahol
|
|
|
+ *
|
|
|
+ * 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 "libavutil/dict.h"
|
|
|
+#include "libavutil/intreadwrite.h"
|
|
|
+
|
|
|
+#include "apetag.h"
|
|
|
+#include "avformat.h"
|
|
|
+#include "avio_internal.h"
|
|
|
+#include "demux.h"
|
|
|
+#include "internal.h"
|
|
|
+
|
|
|
+typedef struct RKAContext {
|
|
|
+ int total_frames, currentframe;
|
|
|
+ int frame_size;
|
|
|
+ int last_frame_size;
|
|
|
+} RKAContext;
|
|
|
+
|
|
|
+static int rka_probe(const AVProbeData *p)
|
|
|
+{
|
|
|
+ if (AV_RL32(&p->buf[0]) == MKTAG('R', 'K', 'A', '7') &&
|
|
|
+ AV_RL32(&p->buf[4]) > 0 &&
|
|
|
+ AV_RL32(&p->buf[8]) > 0 &&
|
|
|
+ p->buf[12] > 0 &&
|
|
|
+ p->buf[12] <= 2 &&
|
|
|
+ (p->buf[13] == 8 || p->buf[13] == 16) &&
|
|
|
+ p->buf[15] & 2 != 0)
|
|
|
+ return AVPROBE_SCORE_EXTENSION + 30;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int rka_read_header(AVFormatContext *s)
|
|
|
+{
|
|
|
+ int64_t nb_samples, size_offset;
|
|
|
+ RKAContext *c = s->priv_data;
|
|
|
+ int channels, bps, samplerate;
|
|
|
+ AVCodecParameters *par;
|
|
|
+ int64_t framepos;
|
|
|
+ AVStream *st;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ st = avformat_new_stream(s, NULL);
|
|
|
+ if (!st)
|
|
|
+ return AVERROR(ENOMEM);
|
|
|
+
|
|
|
+ par = st->codecpar;
|
|
|
+ ret = ff_get_extradata(s, par, s->pb, 16);
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ nb_samples = AV_RL32(par->extradata + 4);
|
|
|
+ samplerate = AV_RL32(par->extradata + 8);
|
|
|
+ channels = par->extradata[12];
|
|
|
+ if (channels == 0)
|
|
|
+ return AVERROR_INVALIDDATA;
|
|
|
+ bps = par->extradata[13];
|
|
|
+ if (bps == 0)
|
|
|
+ return AVERROR_INVALIDDATA;
|
|
|
+ size_offset = avio_rl32(s->pb);
|
|
|
+ framepos = avio_tell(s->pb);
|
|
|
+ c->frame_size = 131072;
|
|
|
+
|
|
|
+ avpriv_set_pts_info(st, 64, 1, samplerate);
|
|
|
+ st->start_time = 0;
|
|
|
+
|
|
|
+ avio_seek(s->pb, size_offset, SEEK_SET);
|
|
|
+ c->total_frames = (nb_samples + c->frame_size - 1) / c->frame_size;
|
|
|
+ c->last_frame_size = nb_samples % c->frame_size;
|
|
|
+
|
|
|
+ for (int i = 0; i < c->total_frames; i++) {
|
|
|
+ int r, end = 0;
|
|
|
+ int64_t size;
|
|
|
+
|
|
|
+ if (avio_feof(s->pb))
|
|
|
+ break;
|
|
|
+
|
|
|
+ size = avio_rl24(s->pb);
|
|
|
+ if (size == 0) {
|
|
|
+ end = 1;
|
|
|
+ size = size_offset - framepos;
|
|
|
+ if (size <= 0)
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((r = av_add_index_entry(st, framepos, (i * 131072LL) / (channels * (bps >> 3)),
|
|
|
+ size, 0, AVINDEX_KEYFRAME)) < 0)
|
|
|
+ return r;
|
|
|
+ framepos += size;
|
|
|
+
|
|
|
+ if (end)
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ par->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
|
+ par->codec_id = AV_CODEC_ID_RKA;
|
|
|
+ par->ch_layout.nb_channels = channels;
|
|
|
+ par->sample_rate = samplerate;
|
|
|
+ par->bits_per_raw_sample = bps;
|
|
|
+ st->duration = nb_samples / (channels * (bps >> 3));
|
|
|
+
|
|
|
+ if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
|
|
|
+ ff_ape_parse_tag(s);
|
|
|
+
|
|
|
+ avio_seek(s->pb, 20, SEEK_SET);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int rka_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
|
+{
|
|
|
+ RKAContext *c = s->priv_data;
|
|
|
+ AVStream *st = s->streams[0];
|
|
|
+ FFStream *const sti = ffstream(st);
|
|
|
+ int size, ret;
|
|
|
+
|
|
|
+ if (avio_feof(s->pb))
|
|
|
+ return AVERROR_EOF;
|
|
|
+
|
|
|
+ if (c->currentframe >= sti->nb_index_entries)
|
|
|
+ return AVERROR_EOF;
|
|
|
+
|
|
|
+ size = sti->index_entries[c->currentframe].size;
|
|
|
+
|
|
|
+ ret = av_get_packet(s->pb, pkt, size);
|
|
|
+ pkt->dts = sti->index_entries[c->currentframe++].timestamp;
|
|
|
+ pkt->duration = c->currentframe == c->total_frames ? c->last_frame_size :
|
|
|
+ 131072;
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int rka_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
|
|
|
+{
|
|
|
+ RKAContext *c = s->priv_data;
|
|
|
+ AVStream *st = s->streams[stream_index];
|
|
|
+ int index = av_index_search_timestamp(st, timestamp, flags);
|
|
|
+ if (index < 0)
|
|
|
+ return -1;
|
|
|
+ if (avio_seek(s->pb, ffstream(st)->index_entries[index].pos, SEEK_SET) < 0)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ c->currentframe = index;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+const AVInputFormat ff_rka_demuxer = {
|
|
|
+ .name = "rka",
|
|
|
+ .long_name = NULL_IF_CONFIG_SMALL("RKA (RK Audio)"),
|
|
|
+ .priv_data_size = sizeof(RKAContext),
|
|
|
+ .read_probe = rka_probe,
|
|
|
+ .read_header = rka_read_header,
|
|
|
+ .read_packet = rka_read_packet,
|
|
|
+ .read_seek = rka_read_seek,
|
|
|
+ .extensions = "rka",
|
|
|
+};
|
Paul B Mahol