add GXF demuxer

Originally committed as revision 5598 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 259 insertions, 0 deletions

diff --git a/libavformat/gxf.c b/libavformat/gxf.c
new file mode 100644
index 0000000000..3056e35d5a
--- /dev/null
+++ b/libavformat/gxf.c
@@ -0,0 +1,259 @@
+/*
+ * GXF demuxer.
+ * Copyright (c) 2006 Reimar Doeffinger.
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include "avformat.h"
+#include "avi.h"
+
+typedef enum {
+    PKT_MAP = 0xbc,
+    PKT_MEDIA = 0xbf,
+    PKT_EOS = 0xfb,
+    PKT_FLT = 0xfc,
+    PKT_UMF = 0xfd
+} pkt_type_t;
+
+/**
+ * \brief parses a packet header, extracting type and length
+ * \param pb ByteIOContext to read header from
+ * \param type detected packet type is stored here
+ * \param length detected packet length, excluding header is stored here
+ * \return 0 if header not found or contains invalid data, 1 otherwise
+ */
+static int parse_packet_header(ByteIOContext *pb, pkt_type_t *type, int *length) {
+    if (get_be32(pb))
+        return 0;
+    if (get_byte(pb) != 1)
+        return 0;
+    *type = get_byte(pb);
+    *length = get_be32(pb);
+    if ((*length >> 24) || *length < 16)
+        return 0;
+    *length -= 16;
+    if (get_be32(pb))
+        return 0;
+    if (get_byte(pb) != 0xe1)
+        return 0;
+    if (get_byte(pb) != 0xe2)
+        return 0;
+    return 1;
+}
+
+/**
+ * \brief check if file starts with a PKT_MAP header
+ */
+static int gxf_probe(AVProbeData *p) {
+    static const uint8_t startcode[] = {0, 0, 0, 0, 1, 0xbc}; // start with map packet
+    static const uint8_t endcode[] = {0, 0, 0, 0, 0xe1, 0xe2};
+    if (p->buf_size < 16)
+        return 0;
+    if (!memcmp(p->buf, startcode, sizeof(startcode)) &&
+        !memcmp(&p->buf[16 - sizeof(endcode)], endcode, sizeof(endcode)))
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+/**
+ * \brief gets the stream index for the track with the specified id, creates new
+ *        stream if not found
+ * \param stream id of stream to find / add
+ * \param format stream format identifier
+ */
+static int get_sindex(AVFormatContext *s, int id, int format) {
+    int i;
+    AVStream *st = NULL;
+    for (i = 0; i < s->nb_streams; i++) {
+        if (s->streams[i]->id == id)
+            return i;
+    }
+    st = av_new_stream(s, id);
+    switch (format) {
+        case 3:
+        case 4:
+            st->codec->codec_type = CODEC_TYPE_VIDEO;
+            st->codec->codec_id = CODEC_ID_MJPEG;
+            st->codec->codec_tag = MKTAG('M', 'J', 'P', 'G');
+            break;
+        case 13:
+        case 15:
+            st->codec->codec_type = CODEC_TYPE_VIDEO;
+            st->codec->codec_id = CODEC_ID_DVVIDEO;
+            st->codec->codec_tag = MKTAG('d', 'v', 'c', ' ');
+            break;
+        case 14:
+        case 16:
+            st->codec->codec_type = CODEC_TYPE_VIDEO;
+            st->codec->codec_id = CODEC_ID_DVVIDEO;
+            st->codec->codec_tag = MKTAG('d', 'v', 'c', 'p');
+            break;
+        case 11:
+        case 12:
+        case 20:
+            st->codec->codec_type = CODEC_TYPE_VIDEO;
+            st->codec->codec_id = CODEC_ID_MPEG2VIDEO;
+            st->codec->codec_tag = MKTAG('M', 'P', 'G', '2');
+            break;
+        case 22:
+        case 23:
+            st->codec->codec_type = CODEC_TYPE_VIDEO;
+            st->codec->codec_id = CODEC_ID_MPEG1VIDEO;
+            st->codec->codec_tag = MKTAG('M', 'P', 'G', '1');
+            break;
+        case 9:
+            st->codec->codec_type = CODEC_TYPE_AUDIO;
+            st->codec->codec_id = CODEC_ID_PCM_S24LE;
+            st->codec->codec_tag = 0x1;
+            st->codec->channels = 1;
+            st->codec->sample_rate = 48000;
+            st->codec->bit_rate = 3 * 1 * 48000 * 8;
+            st->codec->block_align = 3 * 1;
+            st->codec->bits_per_sample = 24;
+            break;
+        case 10:
+            st->codec->codec_type = CODEC_TYPE_AUDIO;
+            st->codec->codec_id = CODEC_ID_PCM_S16LE;
+            st->codec->codec_tag = 0x1;
+            st->codec->channels = 1;
+            st->codec->sample_rate = 48000;
+            st->codec->bit_rate = 2 * 1 * 48000 * 8;
+            st->codec->block_align = 2 * 1;
+            st->codec->bits_per_sample = 16;
+            break;
+        case 17:
+            st->codec->codec_type = CODEC_TYPE_AUDIO;
+            st->codec->codec_id = CODEC_ID_AC3;
+            st->codec->codec_tag = 0x2000;
+            st->codec->channels = 2;
+            st->codec->sample_rate = 48000;
+            break;
+        default:
+            st->codec->codec_type = CODEC_TYPE_UNKNOWN;
+            st->codec->codec_id = CODEC_ID_NONE;
+            break;
+    }
+    return s->nb_streams - 1;
+}
+
+static int gxf_header(AVFormatContext *s, AVFormatParameters *ap) {
+    ByteIOContext *pb = &s->pb;
+    pkt_type_t pkt_type;
+    int map_len;
+    int len;
+    if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) {
+        av_log(s, AV_LOG_ERROR, "GXF: map packet not found\n");
+        return 0;
+    }
+    map_len -= 2;
+    if (get_byte(pb) != 0x0e0 || get_byte(pb) != 0xff) {
+        av_log(s, AV_LOG_ERROR, "GXF: unknown version or invalid map preamble\n");
+        return 0;
+    }
+    map_len -= 2;
+    len = get_be16(pb); // length of material data section
+    if (len > map_len) {
+        av_log(s, AV_LOG_ERROR, "GXF: material data longer than map data\n");
+        return 0;
+    }
+    map_len -= len;
+    url_fskip(pb, len);
+    map_len -= 2;
+    len = get_be16(pb); // length of track description
+    if (len > map_len) {
+        av_log(s, AV_LOG_ERROR, "GXF: track description longer than map data\n");
+        return 0;
+    }
+    map_len -= len;
+    while (len > 0) {
+        int track_type, track_id, track_len;
+        len -= 4;
+        track_type = get_byte(pb);
+        track_id = get_byte(pb);
+        track_len = get_be16(pb);
+        len -= track_len;
+        url_fskip(pb, track_len);
+        if (!(track_type & 0x80)) {
+           av_log(s, AV_LOG_ERROR, "GXF: invalid track type %x\n", track_type);
+           continue;
+        }
+        track_type &= 0x7f;
+        if ((track_id & 0xc0) != 0xc0) {
+           av_log(s, AV_LOG_ERROR, "GXF: invalid track id %x\n", track_id);
+           continue;
+        }
+        track_id &= 0x3f;
+        get_sindex(s, track_id, track_type);
+    }
+    if (len < 0)
+        av_log(s, AV_LOG_ERROR, "GXF: invalid track description length specified\n");
+    if (map_len)
+        url_fskip(pb, map_len);
+    return 0;
+}
+
+static int gxf_packet(AVFormatContext *s, AVPacket *pkt) {
+    ByteIOContext *pb = &s->pb;
+    pkt_type_t pkt_type;
+    int pkt_len;
+    while (!url_feof(pb)) {
+        int track_type, track_id, ret;
+        if (!parse_packet_header(pb, &pkt_type, &pkt_len)) {
+            if (!url_feof(pb))
+                av_log(s, AV_LOG_ERROR, "GXF: sync lost\n");
+            return -1;
+        }
+        if (pkt_type != PKT_MEDIA) {
+            url_fskip(pb, pkt_len);
+            continue;
+        }
+        if (pkt_len < 16) {
+            av_log(s, AV_LOG_ERROR, "GXF: invalid media packet length\n");
+            continue;
+        }
+        pkt_len -= 16;
+        track_type = get_byte(pb);
+        track_id = get_byte(pb);
+        get_be32(pb); // field number
+        get_be32(pb); // field information
+        get_be32(pb); // "timeline" field number
+        get_byte(pb); // flags
+        get_byte(pb); // reserved
+        // NOTE: there is also data length information in the
+        // field information, it might be better to take this int account
+        // as well.
+        ret = av_get_packet(pb, pkt, pkt_len);
+        pkt->stream_index = get_sindex(s, track_id, track_type);
+        return ret;
+    }
+    return AVERROR_IO;
+}
+
+static AVInputFormat gxf_iformat = {
+    "gxf",
+    "GXF format",
+    0,
+    gxf_probe,
+    gxf_header,
+    gxf_packet,
+    NULL,
+    NULL,
+};
+
+int gxf_init(void) {
+    av_register_input_format(&gxf_iformat);
+    return 0;
+}
+