early-access version 1432

externals/ffmpeg/libavformat/3dostr.c

@@ -0,0 +1,168 @@
+/*
+ * 3DO STR demuxer
+ * Copyright (c) 2015 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 "avformat.h"
+#include "internal.h"
+
+static int threedostr_probe(const AVProbeData *p)
+{
+    if (memcmp(p->buf, "CTRL", 4) &&
+        memcmp(p->buf, "SHDR", 4) &&
+        memcmp(p->buf, "SNDS", 4))
+        return 0;
+
+    return AVPROBE_SCORE_MAX / 3 * 2;
+}
+
+static int threedostr_read_header(AVFormatContext *s)
+{
+    unsigned chunk, codec = 0, size, ctrl_size = -1, found_shdr = 0;
+    AVStream *st;
+
+    while (!avio_feof(s->pb) && !found_shdr) {
+        chunk = avio_rl32(s->pb);
+        size  = avio_rb32(s->pb);
+
+        if (size < 8)
+            return AVERROR_INVALIDDATA;
+        size -= 8;
+
+        switch (chunk) {
+        case MKTAG('C','T','R','L'):
+            ctrl_size = size;
+            break;
+        case MKTAG('S','N','D','S'):
+            if (size < 56)
+                return AVERROR_INVALIDDATA;
+            avio_skip(s->pb, 8);
+            if (avio_rl32(s->pb) != MKTAG('S','H','D','R'))
+                return AVERROR_INVALIDDATA;
+            avio_skip(s->pb, 24);
+
+            st = avformat_new_stream(s, NULL);
+            if (!st)
+                return AVERROR(ENOMEM);
+
+            st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
+            st->codecpar->sample_rate = avio_rb32(s->pb);
+            st->codecpar->channels    = avio_rb32(s->pb);
+            if (st->codecpar->channels <= 0)
+                return AVERROR_INVALIDDATA;
+            codec                  = avio_rl32(s->pb);
+            avio_skip(s->pb, 4);
+            if (ctrl_size == 20 || ctrl_size == 3 || ctrl_size == -1)
+                st->duration       = (avio_rb32(s->pb) - 1) / st->codecpar->channels;
+            else
+                st->duration       = avio_rb32(s->pb) * 16 / st->codecpar->channels;
+            size -= 56;
+            found_shdr = 1;
+            break;
+        case MKTAG('S','H','D','R'):
+            if (size >  0x78) {
+                avio_skip(s->pb, 0x74);
+                size -= 0x78;
+                if (avio_rl32(s->pb) == MKTAG('C','T','R','L') && size > 4) {
+                    ctrl_size = avio_rb32(s->pb);
+                    size -= 4;
+                }
+            }
+            break;
+        default:
+            av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk);
+            break;
+        }
+
+        avio_skip(s->pb, size);
+    }
+
+    switch (codec) {
+    case MKTAG('S','D','X','2'):
+        st->codecpar->codec_id    = AV_CODEC_ID_SDX2_DPCM;
+        st->codecpar->block_align = 1 * st->codecpar->channels;
+        break;
+    default:
+        avpriv_request_sample(s, "codec %X", codec);
+        return AVERROR_PATCHWELCOME;
+    }
+
+    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
+
+    return 0;
+}
+
+static int threedostr_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    unsigned chunk, size, found_ssmp = 0;
+    AVStream *st = s->streams[0];
+    int64_t pos;
+    int ret = 0;
+
+    while (!found_ssmp) {
+        if (avio_feof(s->pb))
+            return AVERROR_EOF;
+
+        pos   = avio_tell(s->pb);
+        chunk = avio_rl32(s->pb);
+        size  = avio_rb32(s->pb);
+
+        if (!size)
+            continue;
+
+        if (size < 8)
+            return AVERROR_INVALIDDATA;
+        size -= 8;
+
+        switch (chunk) {
+        case MKTAG('S','N','D','S'):
+            if (size <= 16)
+                return AVERROR_INVALIDDATA;
+            avio_skip(s->pb, 8);
+            if (avio_rl32(s->pb) != MKTAG('S','S','M','P'))
+                return AVERROR_INVALIDDATA;
+            avio_skip(s->pb, 4);
+            size -= 16;
+            ret = av_get_packet(s->pb, pkt, size);
+            pkt->pos = pos;
+            pkt->stream_index = 0;
+            pkt->duration = size / st->codecpar->channels;
+            size = 0;
+            found_ssmp = 1;
+            break;
+        default:
+            av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk);
+            break;
+        }
+
+        avio_skip(s->pb, size);
+    }
+
+    return ret;
+}
+
+AVInputFormat ff_threedostr_demuxer = {
+    .name           = "3dostr",
+    .long_name      = NULL_IF_CONFIG_SMALL("3DO STR"),
+    .read_probe     = threedostr_probe,
+    .read_header    = threedostr_read_header,
+    .read_packet    = threedostr_read_packet,
+    .extensions     = "str",
+    .flags          = AVFMT_GENERIC_INDEX,
+};