LCOV - code coverage report
Current view: top level - libavformat - rtpdec_jpeg.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 176 0.0 %
Date: 2017-12-17 04:34:43 Functions: 0 6 0.0 %

          Line data    Source code
       1             : /*
       2             :  * RTP JPEG-compressed Video Depacketizer, RFC 2435
       3             :  * Copyright (c) 2012 Samuel Pitoiset
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "avformat.h"
      23             : #include "avio_internal.h"
      24             : #include "rtpdec.h"
      25             : #include "rtpdec_formats.h"
      26             : #include "libavutil/intreadwrite.h"
      27             : #include "libavcodec/jpegtables.h"
      28             : #include "libavcodec/mjpeg.h"
      29             : #include "libavcodec/bytestream.h"
      30             : 
      31             : /**
      32             :  * RTP/JPEG specific private data.
      33             :  */
      34             : struct PayloadContext {
      35             :     AVIOContext *frame;         ///< current frame buffer
      36             :     uint32_t    timestamp;      ///< current frame timestamp
      37             :     int         hdr_size;       ///< size of the current frame header
      38             :     uint8_t     qtables[128][128];
      39             :     uint8_t     qtables_len[128];
      40             : };
      41             : 
      42             : static const uint8_t default_quantizers[128] = {
      43             :     /* luma table */
      44             :     16,  11,  12,  14,  12,  10,  16,  14,
      45             :     13,  14,  18,  17,  16,  19,  24,  40,
      46             :     26,  24,  22,  22,  24,  49,  35,  37,
      47             :     29,  40,  58,  51,  61,  60,  57,  51,
      48             :     56,  55,  64,  72,  92,  78,  64,  68,
      49             :     87,  69,  55,  56,  80,  109, 81,  87,
      50             :     95,  98,  103, 104, 103, 62,  77,  113,
      51             :     121, 112, 100, 120, 92,  101, 103, 99,
      52             : 
      53             :     /* chroma table */
      54             :     17,  18,  18,  24,  21,  24,  47,  26,
      55             :     26,  47,  99,  66,  56,  66,  99,  99,
      56             :     99,  99,  99,  99,  99,  99,  99,  99,
      57             :     99,  99,  99,  99,  99,  99,  99,  99,
      58             :     99,  99,  99,  99,  99,  99,  99,  99,
      59             :     99,  99,  99,  99,  99,  99,  99,  99,
      60             :     99,  99,  99,  99,  99,  99,  99,  99,
      61             :     99,  99,  99,  99,  99,  99,  99,  99
      62             : };
      63             : 
      64           0 : static void jpeg_close_context(PayloadContext *jpeg)
      65             : {
      66           0 :     ffio_free_dyn_buf(&jpeg->frame);
      67           0 : }
      68             : 
      69           0 : static int jpeg_create_huffman_table(PutByteContext *p, int table_class,
      70             :                                      int table_id, const uint8_t *bits_table,
      71             :                                      const uint8_t *value_table)
      72             : {
      73           0 :     int i, n = 0;
      74             : 
      75           0 :     bytestream2_put_byte(p, table_class << 4 | table_id);
      76             : 
      77           0 :     for (i = 1; i <= 16; i++) {
      78           0 :         n += bits_table[i];
      79           0 :         bytestream2_put_byte(p, bits_table[i]);
      80             :     }
      81             : 
      82           0 :     for (i = 0; i < n; i++) {
      83           0 :         bytestream2_put_byte(p, value_table[i]);
      84             :     }
      85           0 :     return n + 17;
      86             : }
      87             : 
      88           0 : static void jpeg_put_marker(PutByteContext *pbc, int code)
      89             : {
      90           0 :     bytestream2_put_byte(pbc, 0xff);
      91           0 :     bytestream2_put_byte(pbc, code);
      92           0 : }
      93             : 
      94           0 : static int jpeg_create_header(uint8_t *buf, int size, uint32_t type, uint32_t w,
      95             :                               uint32_t h, const uint8_t *qtable, int nb_qtable,
      96             :                               int dri)
      97             : {
      98             :     PutByteContext pbc;
      99             :     uint8_t *dht_size_ptr;
     100             :     int dht_size, i;
     101             : 
     102           0 :     bytestream2_init_writer(&pbc, buf, size);
     103             : 
     104             :     /* Convert from blocks to pixels. */
     105           0 :     w <<= 3;
     106           0 :     h <<= 3;
     107             : 
     108             :     /* SOI */
     109           0 :     jpeg_put_marker(&pbc, SOI);
     110             : 
     111             :     /* JFIF header */
     112           0 :     jpeg_put_marker(&pbc, APP0);
     113           0 :     bytestream2_put_be16(&pbc, 16);
     114           0 :     bytestream2_put_buffer(&pbc, "JFIF", 5);
     115           0 :     bytestream2_put_be16(&pbc, 0x0201);
     116           0 :     bytestream2_put_byte(&pbc, 0);
     117           0 :     bytestream2_put_be16(&pbc, 1);
     118           0 :     bytestream2_put_be16(&pbc, 1);
     119           0 :     bytestream2_put_byte(&pbc, 0);
     120           0 :     bytestream2_put_byte(&pbc, 0);
     121             : 
     122           0 :     if (dri) {
     123           0 :         jpeg_put_marker(&pbc, DRI);
     124           0 :         bytestream2_put_be16(&pbc, 4);
     125           0 :         bytestream2_put_be16(&pbc, dri);
     126             :     }
     127             : 
     128             :     /* DQT */
     129           0 :     jpeg_put_marker(&pbc, DQT);
     130           0 :     bytestream2_put_be16(&pbc, 2 + nb_qtable * (1 + 64));
     131             : 
     132           0 :     for (i = 0; i < nb_qtable; i++) {
     133           0 :         bytestream2_put_byte(&pbc, i);
     134             : 
     135             :         /* Each table is an array of 64 values given in zig-zag
     136             :          * order, identical to the format used in a JFIF DQT
     137             :          * marker segment. */
     138           0 :         bytestream2_put_buffer(&pbc, qtable + 64 * i, 64);
     139             :     }
     140             : 
     141             :     /* DHT */
     142           0 :     jpeg_put_marker(&pbc, DHT);
     143           0 :     dht_size_ptr = pbc.buffer;
     144           0 :     bytestream2_put_be16(&pbc, 0);
     145             : 
     146           0 :     dht_size  = 2;
     147           0 :     dht_size += jpeg_create_huffman_table(&pbc, 0, 0,avpriv_mjpeg_bits_dc_luminance,
     148             :                                           avpriv_mjpeg_val_dc);
     149           0 :     dht_size += jpeg_create_huffman_table(&pbc, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
     150             :                                           avpriv_mjpeg_val_dc);
     151           0 :     dht_size += jpeg_create_huffman_table(&pbc, 1, 0, avpriv_mjpeg_bits_ac_luminance,
     152             :                                           avpriv_mjpeg_val_ac_luminance);
     153           0 :     dht_size += jpeg_create_huffman_table(&pbc, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
     154             :                                           avpriv_mjpeg_val_ac_chrominance);
     155           0 :     AV_WB16(dht_size_ptr, dht_size);
     156             : 
     157             :     /* SOF0 */
     158           0 :     jpeg_put_marker(&pbc, SOF0);
     159           0 :     bytestream2_put_be16(&pbc, 17); /* size */
     160           0 :     bytestream2_put_byte(&pbc, 8); /* bits per component */
     161           0 :     bytestream2_put_be16(&pbc, h);
     162           0 :     bytestream2_put_be16(&pbc, w);
     163           0 :     bytestream2_put_byte(&pbc, 3); /* number of components */
     164           0 :     bytestream2_put_byte(&pbc, 1); /* component number */
     165           0 :     bytestream2_put_byte(&pbc, (2 << 4) | (type ? 2 : 1)); /* hsample/vsample */
     166           0 :     bytestream2_put_byte(&pbc, 0); /* matrix number */
     167           0 :     bytestream2_put_byte(&pbc, 2); /* component number */
     168           0 :     bytestream2_put_byte(&pbc, 1 << 4 | 1); /* hsample/vsample */
     169           0 :     bytestream2_put_byte(&pbc, nb_qtable == 2 ? 1 : 0); /* matrix number */
     170           0 :     bytestream2_put_byte(&pbc, 3); /* component number */
     171           0 :     bytestream2_put_byte(&pbc, 1 << 4 | 1); /* hsample/vsample */
     172           0 :     bytestream2_put_byte(&pbc, nb_qtable == 2 ? 1 : 0); /* matrix number */
     173             : 
     174             :     /* SOS */
     175           0 :     jpeg_put_marker(&pbc, SOS);
     176           0 :     bytestream2_put_be16(&pbc, 12);
     177           0 :     bytestream2_put_byte(&pbc, 3);
     178           0 :     bytestream2_put_byte(&pbc, 1);
     179           0 :     bytestream2_put_byte(&pbc, 0);
     180           0 :     bytestream2_put_byte(&pbc, 2);
     181           0 :     bytestream2_put_byte(&pbc, 17);
     182           0 :     bytestream2_put_byte(&pbc, 3);
     183           0 :     bytestream2_put_byte(&pbc, 17);
     184           0 :     bytestream2_put_byte(&pbc, 0);
     185           0 :     bytestream2_put_byte(&pbc, 63);
     186           0 :     bytestream2_put_byte(&pbc, 0);
     187             : 
     188             :     /* Return the length in bytes of the JPEG header. */
     189           0 :     return bytestream2_tell_p(&pbc);
     190             : }
     191             : 
     192           0 : static void create_default_qtables(uint8_t *qtables, uint8_t q)
     193             : {
     194           0 :     int factor = q;
     195             :     int i;
     196             :     uint16_t S;
     197             : 
     198           0 :     factor = av_clip(q, 1, 99);
     199             : 
     200           0 :     if (q < 50)
     201           0 :         S = 5000 / factor;
     202             :     else
     203           0 :         S = 200 - factor * 2;
     204             : 
     205           0 :     for (i = 0; i < 128; i++) {
     206           0 :         int val = (default_quantizers[i] * S + 50) / 100;
     207             : 
     208             :         /* Limit the quantizers to 1 <= q <= 255. */
     209           0 :         val = av_clip(val, 1, 255);
     210           0 :         qtables[i] = val;
     211             :     }
     212           0 : }
     213             : 
     214           0 : static int jpeg_parse_packet(AVFormatContext *ctx, PayloadContext *jpeg,
     215             :                              AVStream *st, AVPacket *pkt, uint32_t *timestamp,
     216             :                              const uint8_t *buf, int len, uint16_t seq,
     217             :                              int flags)
     218             : {
     219             :     uint8_t type, q, width, height;
     220           0 :     const uint8_t *qtables = NULL;
     221             :     uint16_t qtable_len;
     222             :     uint32_t off;
     223           0 :     int ret, dri = 0;
     224             : 
     225           0 :     if (len < 8) {
     226           0 :         av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
     227           0 :         return AVERROR_INVALIDDATA;
     228             :     }
     229             : 
     230             :     /* Parse the main JPEG header. */
     231           0 :     off    = AV_RB24(buf + 1);  /* fragment byte offset */
     232           0 :     type   = AV_RB8(buf + 4);   /* id of jpeg decoder params */
     233           0 :     q      = AV_RB8(buf + 5);   /* quantization factor (or table id) */
     234           0 :     width  = AV_RB8(buf + 6);   /* frame width in 8 pixel blocks */
     235           0 :     height = AV_RB8(buf + 7);   /* frame height in 8 pixel blocks */
     236           0 :     buf += 8;
     237           0 :     len -= 8;
     238             : 
     239           0 :     if (type & 0x40) {
     240           0 :         if (len < 4) {
     241           0 :             av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
     242           0 :             return AVERROR_INVALIDDATA;
     243             :         }
     244           0 :         dri = AV_RB16(buf);
     245           0 :         buf += 4;
     246           0 :         len -= 4;
     247           0 :         type &= ~0x40;
     248             :     }
     249           0 :     if (type > 1) {
     250           0 :         avpriv_report_missing_feature(ctx, "RTP/JPEG type %"PRIu8, type);
     251           0 :         return AVERROR_PATCHWELCOME;
     252             :     }
     253             : 
     254             :     /* Parse the quantization table header. */
     255           0 :     if (off == 0) {
     256             :         /* Start of JPEG data packet. */
     257             :         uint8_t new_qtables[128];
     258             :         uint8_t hdr[1024];
     259             : 
     260           0 :         if (q > 127) {
     261             :             uint8_t precision;
     262           0 :             if (len < 4) {
     263           0 :                 av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
     264           0 :                 return AVERROR_INVALIDDATA;
     265             :             }
     266             : 
     267             :             /* The first byte is reserved for future use. */
     268           0 :             precision  = AV_RB8(buf + 1);    /* size of coefficients */
     269           0 :             qtable_len = AV_RB16(buf + 2);   /* length in bytes */
     270           0 :             buf += 4;
     271           0 :             len -= 4;
     272             : 
     273           0 :             if (precision)
     274           0 :                 av_log(ctx, AV_LOG_WARNING, "Only 8-bit precision is supported.\n");
     275             : 
     276           0 :             if (qtable_len > 0) {
     277           0 :                 if (len < qtable_len) {
     278           0 :                     av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
     279           0 :                     return AVERROR_INVALIDDATA;
     280             :                 }
     281           0 :                 qtables = buf;
     282           0 :                 buf += qtable_len;
     283           0 :                 len -= qtable_len;
     284           0 :                 if (q < 255) {
     285           0 :                     if (jpeg->qtables_len[q - 128] &&
     286           0 :                         (jpeg->qtables_len[q - 128] != qtable_len ||
     287           0 :                          memcmp(qtables, &jpeg->qtables[q - 128][0], qtable_len))) {
     288           0 :                         av_log(ctx, AV_LOG_WARNING,
     289             :                                "Quantization tables for q=%d changed\n", q);
     290           0 :                     } else if (!jpeg->qtables_len[q - 128] && qtable_len <= 128) {
     291           0 :                         memcpy(&jpeg->qtables[q - 128][0], qtables,
     292             :                                qtable_len);
     293           0 :                         jpeg->qtables_len[q - 128] = qtable_len;
     294             :                     }
     295             :                 }
     296             :             } else {
     297           0 :                 if (q == 255) {
     298           0 :                     av_log(ctx, AV_LOG_ERROR,
     299             :                            "Invalid RTP/JPEG packet. Quantization tables not found.\n");
     300           0 :                     return AVERROR_INVALIDDATA;
     301             :                 }
     302           0 :                 if (!jpeg->qtables_len[q - 128]) {
     303           0 :                     av_log(ctx, AV_LOG_ERROR,
     304             :                            "No quantization tables known for q=%d yet.\n", q);
     305           0 :                     return AVERROR_INVALIDDATA;
     306             :                 }
     307           0 :                 qtables    = &jpeg->qtables[q - 128][0];
     308           0 :                 qtable_len =  jpeg->qtables_len[q - 128];
     309             :             }
     310             :         } else { /* q <= 127 */
     311           0 :             if (q == 0 || q > 99) {
     312           0 :                 av_log(ctx, AV_LOG_ERROR, "Reserved q value %d\n", q);
     313           0 :                 return AVERROR_INVALIDDATA;
     314             :             }
     315           0 :             create_default_qtables(new_qtables, q);
     316           0 :             qtables    = new_qtables;
     317           0 :             qtable_len = sizeof(new_qtables);
     318             :         }
     319             : 
     320             :         /* Skip the current frame in case of the end packet
     321             :          * has been lost somewhere. */
     322           0 :         ffio_free_dyn_buf(&jpeg->frame);
     323             : 
     324           0 :         if ((ret = avio_open_dyn_buf(&jpeg->frame)) < 0)
     325           0 :             return ret;
     326           0 :         jpeg->timestamp = *timestamp;
     327             : 
     328             :         /* Generate a frame and scan headers that can be prepended to the
     329             :          * RTP/JPEG data payload to produce a JPEG compressed image in
     330             :          * interchange format. */
     331           0 :         jpeg->hdr_size = jpeg_create_header(hdr, sizeof(hdr), type, width,
     332             :                                             height, qtables,
     333             :                                             qtable_len / 64, dri);
     334             : 
     335             :         /* Copy JPEG header to frame buffer. */
     336           0 :         avio_write(jpeg->frame, hdr, jpeg->hdr_size);
     337             :     }
     338             : 
     339           0 :     if (!jpeg->frame) {
     340           0 :         av_log(ctx, AV_LOG_ERROR,
     341             :                "Received packet without a start chunk; dropping frame.\n");
     342           0 :         return AVERROR(EAGAIN);
     343             :     }
     344             : 
     345           0 :     if (jpeg->timestamp != *timestamp) {
     346             :         /* Skip the current frame if timestamp is incorrect.
     347             :          * A start packet has been lost somewhere. */
     348           0 :         ffio_free_dyn_buf(&jpeg->frame);
     349           0 :         av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match.\n");
     350           0 :         return AVERROR_INVALIDDATA;
     351             :     }
     352             : 
     353           0 :     if (off != avio_tell(jpeg->frame) - jpeg->hdr_size) {
     354           0 :         av_log(ctx, AV_LOG_ERROR,
     355             :                "Missing packets; dropping frame.\n");
     356           0 :         return AVERROR(EAGAIN);
     357             :     }
     358             : 
     359             :     /* Copy data to frame buffer. */
     360           0 :     avio_write(jpeg->frame, buf, len);
     361             : 
     362           0 :     if (flags & RTP_FLAG_MARKER) {
     363             :         /* End of JPEG data packet. */
     364           0 :         uint8_t buf[2] = { 0xff, EOI };
     365             : 
     366             :         /* Put EOI marker. */
     367           0 :         avio_write(jpeg->frame, buf, sizeof(buf));
     368             : 
     369             :         /* Prepare the JPEG packet. */
     370           0 :         if ((ret = ff_rtp_finalize_packet(pkt, &jpeg->frame, st->index)) < 0) {
     371           0 :             av_log(ctx, AV_LOG_ERROR,
     372             :                    "Error occurred when getting frame buffer.\n");
     373           0 :             return ret;
     374             :         }
     375             : 
     376           0 :         return 0;
     377             :     }
     378             : 
     379           0 :     return AVERROR(EAGAIN);
     380             : }
     381             : 
     382             : RTPDynamicProtocolHandler ff_jpeg_dynamic_handler = {
     383             :     .enc_name          = "JPEG",
     384             :     .codec_type        = AVMEDIA_TYPE_VIDEO,
     385             :     .codec_id          = AV_CODEC_ID_MJPEG,
     386             :     .priv_data_size    = sizeof(PayloadContext),
     387             :     .close             = jpeg_close_context,
     388             :     .parse_packet      = jpeg_parse_packet,
     389             :     .static_payload_id = 26,
     390             : };

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