making act segmenter

1 files changed, 214 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/rtpdec_h263_rfc2190.c b/ffmpeg/libavformat/rtpdec_h263_rfc2190.c
new file mode 100644
index 0000000..4b6e996
--- /dev/null
+++ b/ffmpeg/libavformat/rtpdec_h263_rfc2190.c
@@ -0,0 +1,214 @@
+/*
+ * RTP H.263 Depacketizer, RFC 2190
+ * Copyright (c) 2012 Martin Storsjo
+ * Based on the GStreamer H.263 Depayloder:
+ * Copyright 2005 Wim Taymans
+ * Copyright 2007 Edward Hervey
+ * Copyright 2007 Nokia Corporation
+ * Copyright 2007 Collabora Ltd, Philippe Kalaf
+ * Copyright 2010 Mark Nauwelaerts
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avformat.h"
+#include "rtpdec_formats.h"
+#include "libavutil/intreadwrite.h"
+#include "libavcodec/get_bits.h"
+
+struct PayloadContext {
+    AVIOContext *buf;
+    uint8_t      endbyte;
+    int          endbyte_bits;
+    uint32_t     timestamp;
+    int          newformat;
+};
+
+static PayloadContext *h263_new_context(void)
+{
+    return av_mallocz(sizeof(PayloadContext));
+}
+
+static void h263_free_context(PayloadContext *data)
+{
+    if (!data)
+        return;
+    if (data->buf) {
+        uint8_t *p;
+        avio_close_dyn_buf(data->buf, &p);
+        av_free(p);
+    }
+    av_free(data);
+}
+
+static int h263_init(AVFormatContext *ctx, int st_index, PayloadContext *data)
+{
+    if (st_index < 0)
+        return 0;
+    ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
+    return 0;
+}
+
+static int h263_handle_packet(AVFormatContext *ctx, PayloadContext *data,
+                              AVStream *st, AVPacket *pkt, uint32_t *timestamp,
+                              const uint8_t *buf, int len, uint16_t seq,
+                              int flags)
+{
+    /* Corresponding to header fields in the RFC */
+    int f, p, i, sbit, ebit, src, r;
+    int header_size, ret;
+
+    if (data->newformat)
+        return ff_h263_handle_packet(ctx, data, st, pkt, timestamp, buf, len,
+                                     seq, flags);
+
+    if (data->buf && data->timestamp != *timestamp) {
+        /* Dropping old buffered, unfinished data */
+        uint8_t *p;
+        avio_close_dyn_buf(data->buf, &p);
+        av_free(p);
+        data->buf = NULL;
+    }
+
+    if (len < 4) {
+        av_log(ctx, AV_LOG_ERROR, "Too short H.263 RTP packet: %d\n", len);
+        return AVERROR_INVALIDDATA;
+    }
+
+    f = buf[0] & 0x80;
+    p = buf[0] & 0x40;
+    if (!f) {
+        /* Mode A */
+        header_size = 4;
+        i = buf[1] & 0x10;
+        r = ((buf[1] & 0x01) << 3) | ((buf[2] & 0xe0) >> 5);
+    } else if (!p) {
+        /* Mode B */
+        header_size = 8;
+        if (len < header_size) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Too short H.263 RTP packet: %d bytes, %d header bytes\n",
+                   len, header_size);
+            return AVERROR_INVALIDDATA;
+        }
+        r = buf[3] & 0x03;
+        i = buf[4] & 0x80;
+    } else {
+        /* Mode C */
+        header_size = 12;
+        if (len < header_size) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Too short H.263 RTP packet: %d bytes, %d header bytes\n",
+                   len, header_size);
+            return AVERROR_INVALIDDATA;
+        }
+        r = buf[3] & 0x03;
+        i = buf[4] & 0x80;
+    }
+    sbit = (buf[0] >> 3) & 0x7;
+    ebit =  buf[0]       & 0x7;
+    src  = (buf[1] & 0xe0) >> 5;
+    if (!(buf[0] & 0xf8)) { /* Reserved bits in RFC 2429/4629 are zero */
+        if ((src == 0 || src >= 6) && r) {
+            /* Invalid src for this format, and bits that should be zero
+             * according to RFC 2190 aren't zero. */
+            av_log(ctx, AV_LOG_WARNING,
+                   "Interpreting H263 RTP data as RFC 2429/4629 even though "
+                   "signalled with a static payload type.\n");
+            data->newformat = 1;
+            return ff_h263_handle_packet(ctx, data, st, pkt, timestamp, buf,
+                                         len, seq, flags);
+        }
+    }
+
+    buf += header_size;
+    len -= header_size;
+
+    if (!data->buf) {
+        /* Check the picture start code, only start buffering a new frame
+         * if this is correct */
+        if (len > 4 && AV_RB32(buf) >> 10 == 0x20) {
+            ret = avio_open_dyn_buf(&data->buf);
+            if (ret < 0)
+                return ret;
+            data->timestamp = *timestamp;
+        } else {
+            /* Frame not started yet, skipping */
+            return AVERROR(EAGAIN);
+        }
+    }
+
+    if (data->endbyte_bits || sbit) {
+        if (data->endbyte_bits == sbit) {
+            data->endbyte |= buf[0] & (0xff >> sbit);
+            data->endbyte_bits = 0;
+            buf++;
+            len--;
+            avio_w8(data->buf, data->endbyte);
+        } else {
+            /* Start/end skip bits not matching - missed packets? */
+            GetBitContext gb;
+            init_get_bits(&gb, buf, len*8 - ebit);
+            skip_bits(&gb, sbit);
+            if (data->endbyte_bits) {
+                data->endbyte |= get_bits(&gb, 8 - data->endbyte_bits);
+                avio_w8(data->buf, data->endbyte);
+            }
+            while (get_bits_left(&gb) >= 8)
+                avio_w8(data->buf, get_bits(&gb, 8));
+            data->endbyte_bits = get_bits_left(&gb);
+            if (data->endbyte_bits)
+                data->endbyte = get_bits(&gb, data->endbyte_bits) <<
+                                (8 - data->endbyte_bits);
+            ebit = 0;
+            len = 0;
+        }
+    }
+    if (ebit) {
+        if (len > 0)
+            avio_write(data->buf, buf, len - 1);
+        data->endbyte_bits = 8 - ebit;
+        data->endbyte = buf[len - 1] & (0xff << ebit);
+    } else {
+        avio_write(data->buf, buf, len);
+    }
+
+    if (!(flags & RTP_FLAG_MARKER))
+        return AVERROR(EAGAIN);
+
+    if (data->endbyte_bits)
+        avio_w8(data->buf, data->endbyte);
+    data->endbyte_bits = 0;
+
+    ret = ff_rtp_finalize_packet(pkt, &data->buf, st->index);
+    if (ret < 0)
+        return ret;
+    if (!i)
+        pkt->flags   |= AV_PKT_FLAG_KEY;
+
+    return 0;
+}
+
+RTPDynamicProtocolHandler ff_h263_rfc2190_dynamic_handler = {
+    .codec_type        = AVMEDIA_TYPE_VIDEO,
+    .codec_id          = AV_CODEC_ID_H263,
+    .init              = h263_init,
+    .parse_packet      = h263_handle_packet,
+    .alloc             = h263_new_context,
+    .free              = h263_free_context,
+    .static_payload_id = 34,
+};