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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * RTP JPEG-compressed video Packetizer, RFC 2435 |
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| 3 | * Copyright (c) 2012 Samuel Pitoiset |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavcodec/bytestream.h" |
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| 23 | #include "libavcodec/mjpeg.h" |
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| 24 | #include "libavutil/intreadwrite.h" |
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| 25 | #include "rtpenc.h" |
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| 26 | |||
| 27 | void ff_rtp_send_jpeg(AVFormatContext *s1, const uint8_t *buf, int size) |
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| 28 | { |
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| 29 | RTPMuxContext *s = s1->priv_data; |
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| 30 | const uint8_t *qtables = NULL; |
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| 31 | int nb_qtables = 0; |
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| 32 | uint8_t type = 1; /* default pixel format is AV_PIX_FMT_YUVJ420P */ |
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| 33 | uint8_t w, h; |
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| 34 | uint8_t *p; |
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| 35 | int off = 0; /* fragment offset of the current JPEG frame */ |
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| 36 | int len; |
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| 37 | int i; |
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| 38 | |||
| 39 | s->buf_ptr = s->buf; |
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| 40 | s->timestamp = s->cur_timestamp; |
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| 41 | |||
| 42 | /* convert video pixel dimensions from pixels to blocks */ |
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| 43 | w = s1->streams[0]->codec->width >> 3; |
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| 44 | h = s1->streams[0]->codec->height >> 3; |
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| 45 | |||
| 46 | /* check if pixel format is not the normal 420 case */ |
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| 47 | if (s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUVJ422P) { |
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| 48 | type = 0; |
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| 49 | } else if (s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUVJ420P) { |
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| 50 | type = 1; |
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| 51 | } else { |
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| 52 | av_log(s1, AV_LOG_ERROR, "Unsupported pixel format\n"); |
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| 53 | return; |
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| 54 | } |
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| 55 | |||
| 56 | /* preparse the header for getting some infos */ |
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| 57 | for (i = 0; i < size; i++) { |
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| 58 | if (buf[i] != 0xff) |
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| 59 | continue; |
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| 60 | |||
| 61 | if (buf[i + 1] == DQT) { |
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| 62 | if (buf[i + 4]) |
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| 63 | av_log(s1, AV_LOG_WARNING, |
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| 64 | "Only 8-bit precision is supported.\n"); |
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| 65 | |||
| 66 | /* a quantization table is 64 bytes long */ |
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| 67 | nb_qtables = AV_RB16(&buf[i + 2]) / 65; |
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| 68 | if (i + 4 + nb_qtables * 65 > size) { |
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| 69 | av_log(s1, AV_LOG_ERROR, "Too short JPEG header. Aborted!\n"); |
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| 70 | return; |
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| 71 | } |
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| 72 | |||
| 73 | qtables = &buf[i + 4]; |
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| 74 | } else if (buf[i + 1] == SOF0) { |
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| 75 | if (buf[i + 14] != 17 || buf[i + 17] != 17) { |
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| 76 | av_log(s1, AV_LOG_ERROR, |
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| 77 | "Only 1x1 chroma blocks are supported. Aborted!\n"); |
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| 78 | return; |
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| 79 | } |
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| 80 | } else if (buf[i + 1] == SOS) { |
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| 81 | /* SOS is last marker in the header */ |
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| 82 | i += AV_RB16(&buf[i + 2]) + 2; |
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| 83 | break; |
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| 84 | } |
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| 85 | } |
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| 86 | |||
| 87 | /* skip JPEG header */ |
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| 88 | buf += i; |
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| 89 | size -= i; |
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| 90 | |||
| 91 | for (i = size - 2; i >= 0; i--) { |
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| 92 | if (buf[i] == 0xff && buf[i + 1] == EOI) { |
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| 93 | /* Remove the EOI marker */ |
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| 94 | size = i; |
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| 95 | break; |
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| 96 | } |
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| 97 | } |
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| 98 | |||
| 99 | p = s->buf_ptr; |
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| 100 | while (size > 0) { |
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| 101 | int hdr_size = 8; |
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| 102 | |||
| 103 | if (off == 0 && nb_qtables) |
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| 104 | hdr_size += 4 + 64 * nb_qtables; |
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| 105 | |||
| 106 | /* payload max in one packet */ |
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| 107 | len = FFMIN(size, s->max_payload_size - hdr_size); |
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| 108 | |||
| 109 | /* set main header */ |
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| 110 | bytestream_put_byte(&p, 0); |
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| 111 | bytestream_put_be24(&p, off); |
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| 112 | bytestream_put_byte(&p, type); |
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| 113 | bytestream_put_byte(&p, 255); |
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| 114 | bytestream_put_byte(&p, w); |
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| 115 | bytestream_put_byte(&p, h); |
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| 116 | |||
| 117 | if (off == 0 && nb_qtables) { |
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| 118 | /* set quantization tables header */ |
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| 119 | bytestream_put_byte(&p, 0); |
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| 120 | bytestream_put_byte(&p, 0); |
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| 121 | bytestream_put_be16(&p, 64 * nb_qtables); |
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| 122 | |||
| 123 | for (i = 0; i < nb_qtables; i++) |
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| 124 | bytestream_put_buffer(&p, &qtables[65 * i + 1], 64); |
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| 125 | } |
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| 126 | |||
| 127 | /* copy payload data */ |
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| 128 | memcpy(p, buf, len); |
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| 129 | |||
| 130 | /* marker bit is last packet in frame */ |
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| 131 | ff_rtp_send_data(s1, s->buf, len + hdr_size, size == len); |
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| 132 | |||
| 133 | buf += len; |
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| 134 | size -= len; |
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| 135 | off += len; |
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| 136 | p = s->buf; |
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| 137 | } |
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| 138 | } |