making act segmenter

1 files changed, 392 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/rtpdec_jpeg.c b/ffmpeg/libavformat/rtpdec_jpeg.c
new file mode 100644
index 0000000..80fe295
--- /dev/null
+++ b/ffmpeg/libavformat/rtpdec_jpeg.c
@@ -0,0 +1,392 @@
+/*
+ * RTP JPEG-compressed Video Depacketizer, RFC 2435
+ * Copyright (c) 2012 Samuel Pitoiset
+ *
+ * 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 "avformat.h"
+#include "rtpdec.h"
+#include "rtpdec_formats.h"
+#include "libavutil/intreadwrite.h"
+#include "libavcodec/mjpeg.h"
+#include "libavcodec/bytestream.h"
+
+/**
+ * RTP/JPEG specific private data.
+ */
+struct PayloadContext {
+    AVIOContext *frame;         ///< current frame buffer
+    uint32_t    timestamp;      ///< current frame timestamp
+    int         hdr_size;       ///< size of the current frame header
+    uint8_t     qtables[128][128];
+    uint8_t     qtables_len[128];
+};
+
+static const uint8_t default_quantizers[128] = {
+    /* luma table */
+    16,  11,  12,  14,  12,  10,  16,  14,
+    13,  14,  18,  17,  16,  19,  24,  40,
+    26,  24,  22,  22,  24,  49,  35,  37,
+    29,  40,  58,  51,  61,  60,  57,  51,
+    56,  55,  64,  72,  92,  78,  64,  68,
+    87,  69,  55,  56,  80,  109, 81,  87,
+    95,  98,  103, 104, 103, 62,  77,  113,
+    121, 112, 100, 120, 92,  101, 103, 99,
+
+    /* chroma table */
+    17,  18,  18,  24,  21,  24,  47,  26,
+    26,  47,  99,  66,  56,  66,  99,  99,
+    99,  99,  99,  99,  99,  99,  99,  99,
+    99,  99,  99,  99,  99,  99,  99,  99,
+    99,  99,  99,  99,  99,  99,  99,  99,
+    99,  99,  99,  99,  99,  99,  99,  99,
+    99,  99,  99,  99,  99,  99,  99,  99,
+    99,  99,  99,  99,  99,  99,  99,  99
+};
+
+static PayloadContext *jpeg_new_context(void)
+{
+    return av_mallocz(sizeof(PayloadContext));
+}
+
+static inline void free_frame_if_needed(PayloadContext *jpeg)
+{
+    if (jpeg->frame) {
+        uint8_t *p;
+        avio_close_dyn_buf(jpeg->frame, &p);
+        av_free(p);
+        jpeg->frame = NULL;
+    }
+}
+
+static void jpeg_free_context(PayloadContext *jpeg)
+{
+    free_frame_if_needed(jpeg);
+    av_free(jpeg);
+}
+
+static int jpeg_create_huffman_table(PutByteContext *p, int table_class,
+                                     int table_id, const uint8_t *bits_table,
+                                     const uint8_t *value_table)
+{
+    int i, n = 0;
+
+    bytestream2_put_byte(p, table_class << 4 | table_id);
+
+    for (i = 1; i <= 16; i++) {
+        n += bits_table[i];
+        bytestream2_put_byte(p, bits_table[i]);
+    }
+
+    for (i = 0; i < n; i++) {
+        bytestream2_put_byte(p, value_table[i]);
+    }
+    return n + 17;
+}
+
+static void jpeg_put_marker(PutByteContext *pbc, int code)
+{
+    bytestream2_put_byte(pbc, 0xff);
+    bytestream2_put_byte(pbc, code);
+}
+
+static int jpeg_create_header(uint8_t *buf, int size, uint32_t type, uint32_t w,
+                              uint32_t h, const uint8_t *qtable, int nb_qtable)
+{
+    PutByteContext pbc;
+    uint8_t *dht_size_ptr;
+    int dht_size, i;
+
+    bytestream2_init_writer(&pbc, buf, size);
+
+    /* Convert from blocks to pixels. */
+    w <<= 3;
+    h <<= 3;
+
+    /* SOI */
+    jpeg_put_marker(&pbc, SOI);
+
+    /* JFIF header */
+    jpeg_put_marker(&pbc, APP0);
+    bytestream2_put_be16(&pbc, 16);
+    bytestream2_put_buffer(&pbc, "JFIF", 5);
+    bytestream2_put_be16(&pbc, 0x0201);
+    bytestream2_put_byte(&pbc, 0);
+    bytestream2_put_be16(&pbc, 1);
+    bytestream2_put_be16(&pbc, 1);
+    bytestream2_put_byte(&pbc, 0);
+    bytestream2_put_byte(&pbc, 0);
+
+    /* DQT */
+    jpeg_put_marker(&pbc, DQT);
+    bytestream2_put_be16(&pbc, 2 + nb_qtable * (1 + 64));
+
+    for (i = 0; i < nb_qtable; i++) {
+        bytestream2_put_byte(&pbc, i);
+
+        /* Each table is an array of 64 values given in zig-zag
+         * order, identical to the format used in a JFIF DQT
+         * marker segment. */
+        bytestream2_put_buffer(&pbc, qtable + 64 * i, 64);
+    }
+
+    /* DHT */
+    jpeg_put_marker(&pbc, DHT);
+    dht_size_ptr = pbc.buffer;
+    bytestream2_put_be16(&pbc, 0);
+
+    dht_size  = 2;
+    dht_size += jpeg_create_huffman_table(&pbc, 0, 0,avpriv_mjpeg_bits_dc_luminance,
+                                          avpriv_mjpeg_val_dc);
+    dht_size += jpeg_create_huffman_table(&pbc, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
+                                          avpriv_mjpeg_val_dc);
+    dht_size += jpeg_create_huffman_table(&pbc, 1, 0, avpriv_mjpeg_bits_ac_luminance,
+                                          avpriv_mjpeg_val_ac_luminance);
+    dht_size += jpeg_create_huffman_table(&pbc, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
+                                          avpriv_mjpeg_val_ac_chrominance);
+    AV_WB16(dht_size_ptr, dht_size);
+
+    /* SOF0 */
+    jpeg_put_marker(&pbc, SOF0);
+    bytestream2_put_be16(&pbc, 17); /* size */
+    bytestream2_put_byte(&pbc, 8); /* bits per component */
+    bytestream2_put_be16(&pbc, h);
+    bytestream2_put_be16(&pbc, w);
+    bytestream2_put_byte(&pbc, 3); /* number of components */
+    bytestream2_put_byte(&pbc, 1); /* component number */
+    bytestream2_put_byte(&pbc, (2 << 4) | (type ? 2 : 1)); /* hsample/vsample */
+    bytestream2_put_byte(&pbc, 0); /* matrix number */
+    bytestream2_put_byte(&pbc, 2); /* component number */
+    bytestream2_put_byte(&pbc, 1 << 4 | 1); /* hsample/vsample */
+    bytestream2_put_byte(&pbc, nb_qtable == 2 ? 1 : 0); /* matrix number */
+    bytestream2_put_byte(&pbc, 3); /* component number */
+    bytestream2_put_byte(&pbc, 1 << 4 | 1); /* hsample/vsample */
+    bytestream2_put_byte(&pbc, nb_qtable == 2 ? 1 : 0); /* matrix number */
+
+    /* SOS */
+    jpeg_put_marker(&pbc, SOS);
+    bytestream2_put_be16(&pbc, 12);
+    bytestream2_put_byte(&pbc, 3);
+    bytestream2_put_byte(&pbc, 1);
+    bytestream2_put_byte(&pbc, 0);
+    bytestream2_put_byte(&pbc, 2);
+    bytestream2_put_byte(&pbc, 17);
+    bytestream2_put_byte(&pbc, 3);
+    bytestream2_put_byte(&pbc, 17);
+    bytestream2_put_byte(&pbc, 0);
+    bytestream2_put_byte(&pbc, 63);
+    bytestream2_put_byte(&pbc, 0);
+
+    /* Return the length in bytes of the JPEG header. */
+    return bytestream2_tell_p(&pbc);
+}
+
+static void create_default_qtables(uint8_t *qtables, uint8_t q)
+{
+    int factor = q;
+    int i;
+
+    factor = av_clip(q, 1, 99);
+
+    if (q < 50)
+        q = 5000 / factor;
+    else
+        q = 200 - factor * 2;
+
+    for (i = 0; i < 128; i++) {
+        int val = (default_quantizers[i] * q + 50) / 100;
+
+        /* Limit the quantizers to 1 <= q <= 255. */
+        val = av_clip(val, 1, 255);
+        qtables[i] = val;
+    }
+}
+
+static int jpeg_parse_packet(AVFormatContext *ctx, PayloadContext *jpeg,
+                             AVStream *st, AVPacket *pkt, uint32_t *timestamp,
+                             const uint8_t *buf, int len, uint16_t seq,
+                             int flags)
+{
+    uint8_t type, q, width, height;
+    const uint8_t *qtables = NULL;
+    uint16_t qtable_len;
+    uint32_t off;
+    int ret;
+
+    if (len < 8) {
+        av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* Parse the main JPEG header. */
+    off    = AV_RB24(buf + 1);  /* fragment byte offset */
+    type   = AV_RB8(buf + 4);   /* id of jpeg decoder params */
+    q      = AV_RB8(buf + 5);   /* quantization factor (or table id) */
+    width  = AV_RB8(buf + 6);   /* frame width in 8 pixel blocks */
+    height = AV_RB8(buf + 7);   /* frame height in 8 pixel blocks */
+    buf += 8;
+    len -= 8;
+
+    /* Parse the restart marker header. */
+    if (type > 63) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Unimplemented RTP/JPEG restart marker header.\n");
+        return AVERROR_PATCHWELCOME;
+    }
+    if (type > 1) {
+        av_log(ctx, AV_LOG_ERROR, "Unimplemented RTP/JPEG type %d\n", type);
+        return AVERROR_PATCHWELCOME;
+    }
+
+    /* Parse the quantization table header. */
+    if (off == 0) {
+        /* Start of JPEG data packet. */
+        uint8_t new_qtables[128];
+        uint8_t hdr[1024];
+
+        if (q > 127) {
+            uint8_t precision;
+            if (len < 4) {
+                av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
+                return AVERROR_INVALIDDATA;
+            }
+
+            /* The first byte is reserved for future use. */
+            precision  = AV_RB8(buf + 1);    /* size of coefficients */
+            qtable_len = AV_RB16(buf + 2);   /* length in bytes */
+            buf += 4;
+            len -= 4;
+
+            if (precision)
+                av_log(ctx, AV_LOG_WARNING, "Only 8-bit precision is supported.\n");
+
+            if (qtable_len > 0) {
+                if (len < qtable_len) {
+                    av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
+                    return AVERROR_INVALIDDATA;
+                }
+                qtables = buf;
+                buf += qtable_len;
+                len -= qtable_len;
+                if (q < 255) {
+                    if (jpeg->qtables_len[q - 128] &&
+                        (jpeg->qtables_len[q - 128] != qtable_len ||
+                         memcmp(qtables, &jpeg->qtables[q - 128][0], qtable_len))) {
+                        av_log(ctx, AV_LOG_WARNING,
+                               "Quantization tables for q=%d changed\n", q);
+                    } else if (!jpeg->qtables_len[q - 128] && qtable_len <= 128) {
+                        memcpy(&jpeg->qtables[q - 128][0], qtables,
+                               qtable_len);
+                        jpeg->qtables_len[q - 128] = qtable_len;
+                    }
+                }
+            } else {
+                if (q == 255) {
+                    av_log(ctx, AV_LOG_ERROR,
+                           "Invalid RTP/JPEG packet. Quantization tables not found.\n");
+                    return AVERROR_INVALIDDATA;
+                }
+                if (!jpeg->qtables_len[q - 128]) {
+                    av_log(ctx, AV_LOG_ERROR,
+                           "No quantization tables known for q=%d yet.\n", q);
+                    return AVERROR_INVALIDDATA;
+                }
+                qtables    = &jpeg->qtables[q - 128][0];
+                qtable_len =  jpeg->qtables_len[q - 128];
+            }
+        } else { /* q <= 127 */
+            if (q == 0 || q > 99) {
+                av_log(ctx, AV_LOG_ERROR, "Reserved q value %d\n", q);
+                return AVERROR_INVALIDDATA;
+            }
+            create_default_qtables(new_qtables, q);
+            qtables    = new_qtables;
+            qtable_len = sizeof(new_qtables);
+        }
+
+        /* Skip the current frame in case of the end packet
+         * has been lost somewhere. */
+        free_frame_if_needed(jpeg);
+
+        if ((ret = avio_open_dyn_buf(&jpeg->frame)) < 0)
+            return ret;
+        jpeg->timestamp = *timestamp;
+
+        /* Generate a frame and scan headers that can be prepended to the
+         * RTP/JPEG data payload to produce a JPEG compressed image in
+         * interchange format. */
+        jpeg->hdr_size = jpeg_create_header(hdr, sizeof(hdr), type, width,
+                                            height, qtables,
+                                            qtable_len / 64);
+
+        /* Copy JPEG header to frame buffer. */
+        avio_write(jpeg->frame, hdr, jpeg->hdr_size);
+    }
+
+    if (!jpeg->frame) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Received packet without a start chunk; dropping frame.\n");
+        return AVERROR(EAGAIN);
+    }
+
+    if (jpeg->timestamp != *timestamp) {
+        /* Skip the current frame if timestamp is incorrect.
+         * A start packet has been lost somewhere. */
+        free_frame_if_needed(jpeg);
+        av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (off != avio_tell(jpeg->frame) - jpeg->hdr_size) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Missing packets; dropping frame.\n");
+        return AVERROR(EAGAIN);
+    }
+
+    /* Copy data to frame buffer. */
+    avio_write(jpeg->frame, buf, len);
+
+    if (flags & RTP_FLAG_MARKER) {
+        /* End of JPEG data packet. */
+        uint8_t buf[2] = { 0xff, EOI };
+
+        /* Put EOI marker. */
+        avio_write(jpeg->frame, buf, sizeof(buf));
+
+        /* Prepare the JPEG packet. */
+        if ((ret = ff_rtp_finalize_packet(pkt, &jpeg->frame, st->index)) < 0) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Error occurred when getting frame buffer.\n");
+            return ret;
+        }
+
+        return 0;
+    }
+
+    return AVERROR(EAGAIN);
+}
+
+RTPDynamicProtocolHandler ff_jpeg_dynamic_handler = {
+    .enc_name          = "JPEG",
+    .codec_type        = AVMEDIA_TYPE_VIDEO,
+    .codec_id          = AV_CODEC_ID_MJPEG,
+    .alloc             = jpeg_new_context,
+    .free              = jpeg_free_context,
+    .parse_packet      = jpeg_parse_packet,
+    .static_payload_id = 26,
+};