making act segmenter

1 files changed, 195 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/rtpenc_h263_rfc2190.c b/ffmpeg/libavformat/rtpenc_h263_rfc2190.c
new file mode 100644
index 0000000..f714d01
--- /dev/null
+++ b/ffmpeg/libavformat/rtpenc_h263_rfc2190.c
@@ -0,0 +1,195 @@
+/*
+ * RTP packetization for H.263 video
+ * Copyright (c) 2012 Martin Storsjo
+ *
+ * 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 "rtpenc.h"
+#include "libavcodec/put_bits.h"
+#include "libavcodec/get_bits.h"
+
+struct H263Info {
+    int src;
+    int i;
+    int u;
+    int s;
+    int a;
+    int pb;
+    int tr;
+};
+
+struct H263State {
+    int gobn;
+    int mba;
+    int hmv1, vmv1, hmv2, vmv2;
+    int quant;
+};
+
+static void send_mode_a(AVFormatContext *s1, const struct H263Info *info,
+                        const uint8_t *buf, int len, int ebits, int m)
+{
+    RTPMuxContext *s = s1->priv_data;
+    PutBitContext pb;
+
+    init_put_bits(&pb, s->buf, 32);
+    put_bits(&pb, 1, 0); /* F - 0, mode A */
+    put_bits(&pb, 1, 0); /* P - 0, normal I/P */
+    put_bits(&pb, 3, 0); /* SBIT - 0 bits */
+    put_bits(&pb, 3, ebits); /* EBIT */
+    put_bits(&pb, 3, info->src); /* SRC - source format */
+    put_bits(&pb, 1, info->i); /* I - inter/intra */
+    put_bits(&pb, 1, info->u); /* U - unrestricted motion vector */
+    put_bits(&pb, 1, info->s); /* S - syntax-baesd arithmetic coding */
+    put_bits(&pb, 1, info->a); /* A - advanced prediction */
+    put_bits(&pb, 4, 0); /* R - reserved */
+    put_bits(&pb, 2, 0); /* DBQ - 0 */
+    put_bits(&pb, 3, 0); /* TRB - 0 */
+    put_bits(&pb, 8, info->tr); /* TR */
+    flush_put_bits(&pb);
+    memcpy(s->buf + 4, buf, len);
+
+    ff_rtp_send_data(s1, s->buf, len + 4, m);
+}
+
+static void send_mode_b(AVFormatContext *s1, const struct H263Info *info,
+                        const struct H263State *state, const uint8_t *buf,
+                        int len, int sbits, int ebits, int m)
+{
+    RTPMuxContext *s = s1->priv_data;
+    PutBitContext pb;
+
+    init_put_bits(&pb, s->buf, 64);
+    put_bits(&pb, 1, 1); /* F - 1, mode B */
+    put_bits(&pb, 1, 0); /* P - 0, mode B */
+    put_bits(&pb, 3, sbits); /* SBIT - 0 bits */
+    put_bits(&pb, 3, ebits); /* EBIT - 0 bits */
+    put_bits(&pb, 3, info->src); /* SRC - source format */
+    put_bits(&pb, 5, state->quant); /* QUANT - quantizer for the first MB */
+    put_bits(&pb, 5, state->gobn); /* GOBN - GOB number */
+    put_bits(&pb, 9, state->mba); /* MBA - MB address */
+    put_bits(&pb, 2, 0); /* R - reserved */
+    put_bits(&pb, 1, info->i); /* I - inter/intra */
+    put_bits(&pb, 1, info->u); /* U - unrestricted motion vector */
+    put_bits(&pb, 1, info->s); /* S - syntax-baesd arithmetic coding */
+    put_bits(&pb, 1, info->a); /* A - advanced prediction */
+    put_bits(&pb, 7, state->hmv1); /* HVM1 - horizontal motion vector 1 */
+    put_bits(&pb, 7, state->vmv1); /* VMV1 - vertical motion vector 1 */
+    put_bits(&pb, 7, state->hmv2); /* HVM2 - horizontal motion vector 2 */
+    put_bits(&pb, 7, state->vmv2); /* VMV2 - vertical motion vector 2 */
+    flush_put_bits(&pb);
+    memcpy(s->buf + 8, buf, len);
+
+    ff_rtp_send_data(s1, s->buf, len + 8, m);
+}
+
+void ff_rtp_send_h263_rfc2190(AVFormatContext *s1, const uint8_t *buf, int size,
+                              const uint8_t *mb_info, int mb_info_size)
+{
+    RTPMuxContext *s = s1->priv_data;
+    int len, sbits = 0, ebits = 0;
+    GetBitContext gb;
+    struct H263Info info = { 0 };
+    struct H263State state = { 0 };
+    int mb_info_pos = 0, mb_info_count = mb_info_size / 12;
+    const uint8_t *buf_base = buf;
+
+    s->timestamp = s->cur_timestamp;
+
+    init_get_bits(&gb, buf, size*8);
+    if (get_bits(&gb, 22) == 0x20) { /* Picture Start Code */
+        info.tr  = get_bits(&gb, 8);
+        skip_bits(&gb, 2); /* PTYPE start, H261 disambiguation */
+        skip_bits(&gb, 3); /* Split screen, document camera, freeze picture release */
+        info.src = get_bits(&gb, 3);
+        info.i   = get_bits(&gb, 1);
+        info.u   = get_bits(&gb, 1);
+        info.s   = get_bits(&gb, 1);
+        info.a   = get_bits(&gb, 1);
+        info.pb  = get_bits(&gb, 1);
+    }
+
+    while (size > 0) {
+        struct H263State packet_start_state = state;
+        len = FFMIN(s->max_payload_size - 8, size);
+
+        /* Look for a better place to split the frame into packets. */
+        if (len < size) {
+            const uint8_t *end = ff_h263_find_resync_marker_reverse(buf,
+                                                                    buf + len);
+            len = end - buf;
+            if (len == s->max_payload_size - 8) {
+                /* Skip mb info prior to the start of the current ptr */
+                while (mb_info_pos < mb_info_count) {
+                    uint32_t pos = AV_RL32(&mb_info[12*mb_info_pos])/8;
+                    if (pos >= buf - buf_base)
+                        break;
+                    mb_info_pos++;
+                }
+                /* Find the first mb info past the end pointer */
+                while (mb_info_pos + 1 < mb_info_count) {
+                    uint32_t pos = AV_RL32(&mb_info[12*(mb_info_pos + 1)])/8;
+                    if (pos >= end - buf_base)
+                        break;
+                    mb_info_pos++;
+                }
+                if (mb_info_pos < mb_info_count) {
+                    const uint8_t *ptr = &mb_info[12*mb_info_pos];
+                    uint32_t bit_pos = AV_RL32(ptr);
+                    uint32_t pos = (bit_pos + 7)/8;
+                    if (pos <= end - buf_base) {
+                        state.quant = ptr[4];
+                        state.gobn  = ptr[5];
+                        state.mba   = AV_RL16(&ptr[6]);
+                        state.hmv1  = (int8_t) ptr[8];
+                        state.vmv1  = (int8_t) ptr[9];
+                        state.hmv2  = (int8_t) ptr[10];
+                        state.vmv2  = (int8_t) ptr[11];
+                        ebits = 8 * pos - bit_pos;
+                        len   = pos - (buf - buf_base);
+                        mb_info_pos++;
+                    } else {
+                        av_log(s1, AV_LOG_ERROR,
+                               "Unable to split H263 packet, use -mb_info %d "
+                               "or lower.\n", s->max_payload_size - 8);
+                    }
+                } else {
+                    av_log(s1, AV_LOG_ERROR, "Unable to split H263 packet, "
+                           "use -mb_info %d or -ps 1.\n",
+                           s->max_payload_size - 8);
+                }
+            }
+        }
+
+        if (size > 2 && !buf[0] && !buf[1])
+            send_mode_a(s1, &info, buf, len, ebits, len == size);
+        else
+            send_mode_b(s1, &info, &packet_start_state, buf, len, sbits,
+                        ebits, len == size);
+
+        if (ebits) {
+            sbits = 8 - ebits;
+            len--;
+        } else {
+            sbits = 0;
+        }
+        buf  += len;
+        size -= len;
+        ebits = 0;
+    }
+}