split swf de/muxer

Originally committed as revision 13203 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 206 insertions, 0 deletions

diff --git a/libavformat/swfdec.c b/libavformat/swfdec.c
new file mode 100644
index 0000000000..7f5a38f8b6
--- /dev/null
+++ b/libavformat/swfdec.c
@@ -0,0 +1,206 @@
+/*
+ * Flash Compatible Streaming Format
+ * Copyright (c) 2000 Fabrice Bellard.
+ * Copyright (c) 2003 Tinic Uro.
+ *
+ * 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 "swf.h"
+
+/*********************************************/
+/* Extract FLV encoded frame and MP3 from swf
+   Note that the detection of the real frame
+   is inaccurate at this point as it can be
+   quite tricky to determine, you almost certainly
+   will get a bad audio/video sync */
+
+static int get_swf_tag(ByteIOContext *pb, int *len_ptr)
+{
+    int tag, len;
+
+    if (url_feof(pb))
+        return -1;
+
+    tag = get_le16(pb);
+    len = tag & 0x3f;
+    tag = tag >> 6;
+    if (len == 0x3f) {
+        len = get_le32(pb);
+    }
+//    av_log(NULL, AV_LOG_DEBUG, "Tag: %d - Len: %d\n", tag, len);
+    *len_ptr = len;
+    return tag;
+}
+
+
+static int swf_probe(AVProbeData *p)
+{
+    /* check file header */
+    if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' &&
+        p->buf[2] == 'S')
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+static int swf_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    SWFContext *swf = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    int nbits, len, tag;
+
+    tag = get_be32(pb) & 0xffffff00;
+
+    if (tag == MKBETAG('C', 'W', 'S', 0)) {
+        av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n");
+        return AVERROR(EIO);
+    }
+    if (tag != MKBETAG('F', 'W', 'S', 0))
+        return AVERROR(EIO);
+    get_le32(pb);
+    /* skip rectangle size */
+    nbits = get_byte(pb) >> 3;
+    len = (4 * nbits - 3 + 7) / 8;
+    url_fskip(pb, len);
+    swf->frame_rate = get_le16(pb); /* 8.8 fixed */
+    get_le16(pb); /* frame count */
+
+    swf->samples_per_frame = 0;
+    s->ctx_flags |= AVFMTCTX_NOHEADER;
+    return 0;
+}
+
+static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    SWFContext *swf = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    AVStream *vst = NULL, *ast = NULL, *st = 0;
+    int tag, len, i, frame, v;
+
+    for(;;) {
+        tag = get_swf_tag(pb, &len);
+        if (tag < 0)
+            return AVERROR(EIO);
+        if (tag == TAG_VIDEOSTREAM && !vst) {
+            int ch_id = get_le16(pb);
+            get_le16(pb);
+            get_le16(pb);
+            get_le16(pb);
+            get_byte(pb);
+            /* Check for FLV1 */
+            vst = av_new_stream(s, ch_id);
+            if (!vst)
+                return -1;
+            vst->codec->codec_type = CODEC_TYPE_VIDEO;
+            vst->codec->codec_id = codec_get_id(swf_codec_tags, get_byte(pb));
+            av_set_pts_info(vst, 64, 256, swf->frame_rate);
+            vst->codec->time_base = (AVRational){ 256, swf->frame_rate };
+            len -= 10;
+        } else if ((tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) && !ast) {
+            /* streaming found */
+            int sample_rate_code;
+            get_byte(pb);
+            v = get_byte(pb);
+            swf->samples_per_frame = get_le16(pb);
+            ast = av_new_stream(s, -1); /* -1 to avoid clash with video stream ch_id */
+            if (!ast)
+                return -1;
+            swf->audio_stream_index = ast->index;
+            ast->codec->channels = 1 + (v&1);
+            ast->codec->codec_type = CODEC_TYPE_AUDIO;
+            ast->codec->codec_id = codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
+            ast->need_parsing = AVSTREAM_PARSE_FULL;
+            sample_rate_code= (v>>2) & 3;
+            if (!sample_rate_code)
+                return AVERROR(EIO);
+            ast->codec->sample_rate = 11025 << (sample_rate_code-1);
+            av_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
+            len -= 4;
+        } else if (tag == TAG_VIDEOFRAME) {
+            int ch_id = get_le16(pb);
+            len -= 2;
+            for(i=0; i<s->nb_streams; i++) {
+                st = s->streams[i];
+                if (st->codec->codec_type == CODEC_TYPE_VIDEO && st->id == ch_id) {
+                    frame = get_le16(pb);
+                    av_get_packet(pb, pkt, len-2);
+                    pkt->pts = frame;
+                    pkt->stream_index = st->index;
+                    return pkt->size;
+                }
+            }
+        } else if (tag == TAG_STREAMBLOCK) {
+            st = s->streams[swf->audio_stream_index];
+            if (st->codec->codec_id == CODEC_ID_MP3) {
+                url_fskip(pb, 4);
+                av_get_packet(pb, pkt, len-4);
+            } else { // ADPCM, PCM
+                av_get_packet(pb, pkt, len);
+            }
+            pkt->stream_index = st->index;
+            return pkt->size;
+        } else if (tag == TAG_JPEG2) {
+            for (i=0; i<s->nb_streams; i++) {
+                st = s->streams[i];
+                if (st->id == -2)
+                    break;
+            }
+            if (i == s->nb_streams) {
+                vst = av_new_stream(s, -2); /* -2 to avoid clash with video stream and audio stream */
+                if (!vst)
+                    return -1;
+                vst->codec->codec_type = CODEC_TYPE_VIDEO;
+                vst->codec->codec_id = CODEC_ID_MJPEG;
+                av_set_pts_info(vst, 64, 256, swf->frame_rate);
+                vst->codec->time_base = (AVRational){ 256, swf->frame_rate };
+                st = vst;
+            }
+            get_le16(pb); /* BITMAP_ID */
+            av_new_packet(pkt, len-2);
+            get_buffer(pb, pkt->data, 4);
+            if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
+                AV_RB32(pkt->data) == 0xffd9ffd8) {
+                /* old SWF files containing SOI/EOI as data start */
+                /* files created by swink have reversed tag */
+                pkt->size -= 4;
+                get_buffer(pb, pkt->data, pkt->size);
+            } else {
+                get_buffer(pb, pkt->data + 4, pkt->size - 4);
+            }
+            pkt->stream_index = st->index;
+            return pkt->size;
+        }
+        url_fskip(pb, len);
+    }
+    return 0;
+}
+
+static int swf_read_close(AVFormatContext *s)
+{
+    return 0;
+}
+
+AVInputFormat swf_demuxer = {
+    "swf",
+    "Flash format",
+    sizeof(SWFContext),
+    swf_probe,
+    swf_read_header,
+    swf_read_packet,
+    swf_read_close,
+};