flash video (flv) support patch by (Garrick Meeker <gmeeker at theoryllc dot com>)

Originally committed as revision 2024 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 156 insertions, 0 deletions

diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
new file mode 100644
index 0000000000..b15e143c73
--- /dev/null
+++ b/libavformat/flvdec.c
@@ -0,0 +1,156 @@
+/*
+ * FLV encoder.
+ * Copyright (c) 2003 The FFmpeg Project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+
+unsigned int get_be24(ByteIOContext *s)
+{
+    unsigned int val;
+    val = get_byte(s) << 16;
+    val |= get_byte(s) << 8;
+    val |= get_byte(s);
+    return val;
+}
+
+static int flv_probe(AVProbeData *p)
+{
+    const uint8_t *d;
+
+    if (p->buf_size < 6)
+        return 0;
+    d = p->buf;
+    if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V') {
+        return 50;
+    }
+    return 0;
+}
+
+static int flv_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    int offset, flags;
+    AVStream *st;
+
+    av_set_pts_info(s, 24, 1, 1000); /* 24 bit pts in ms */
+
+    url_fskip(&s->pb, 4);
+    flags = get_byte(&s->pb);
+
+    if ((flags & 1)) {
+        st = av_new_stream(s, 0);
+        if (!st)
+            return AVERROR_NOMEM;
+        st->codec.codec_type = CODEC_TYPE_VIDEO;
+        st->codec.codec_id = CODEC_ID_FLV1;
+    }
+
+    if ((flags & 4)) {
+        st = av_new_stream(s, 1);
+        if (!st)
+            return AVERROR_NOMEM;
+        st->codec.codec_type = CODEC_TYPE_AUDIO;
+        st->codec.codec_id = CODEC_ID_MP3LAME;
+    }
+
+    offset = get_be32(&s->pb);
+    url_fseek(&s->pb, offset, SEEK_SET);
+
+    return 0;
+}
+
+static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret, i, type, size, pts, flags;
+    AVStream *st;
+    
+ redo:
+    url_fskip(&s->pb, 4); /* size of previous packet */
+    type = get_byte(&s->pb);
+    size = get_be24(&s->pb);
+    pts = get_be24(&s->pb);
+    if (url_feof(&s->pb))
+        return -EIO;
+    url_fskip(&s->pb, 4); /* reserved */
+    flags = 0;
+    if (type == 8) {
+        flags = get_byte(&s->pb);
+        size--;
+        if ((flags >> 4) != 2) { /* 0: uncompressed 1: ADPCM 2: mp3 5: Nellymoser 8kHz mono 6: Nellymoser*/
+            goto skip;
+        }
+    } else if (type == 9) {
+        flags = get_byte(&s->pb);
+        size--;
+        if ((flags & 0xF) != 2) { /* 2: only format */
+            goto skip;
+        }
+    } else {
+    skip:
+        /* skip packet */
+        printf("skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
+        url_fskip(&s->pb, size);
+        goto redo;
+    }
+
+    /* now find stream */
+    for(i=0;i<s->nb_streams;i++) {
+        st = s->streams[i];
+        if (st->id == ((type == 9) ? 0 : 1))
+            goto found;
+    }
+    goto skip;
+ found:
+
+    if (av_new_packet(pkt, size) < 0)
+        return -EIO;
+
+    ret = get_buffer(&s->pb, pkt->data, size);
+    if (ret <= 0) {
+        av_free_packet(pkt);
+        return -EIO;
+    }
+    /* note: we need to modify the packet size here to handle the last
+       packet */
+    pkt->size = ret;
+    pkt->pts = pts;
+    pkt->stream_index = st->index;
+    return ret;
+}
+
+static int flv_read_close(AVFormatContext *s)
+{
+    return 0;
+}
+
+AVInputFormat flv_iformat = {
+    "flv",
+    "flv format",
+    0,
+    flv_probe,
+    flv_read_header,
+    flv_read_packet,
+    flv_read_close,
+    .extensions = "flv",
+    .value = CODEC_ID_FLV1,
+};
+
+int flvdec_init(void)
+{
+    av_register_input_format(&flv_iformat);
+    return 0;
+}