summaryrefslogtreecommitdiff
path: root/libavformat/rtpdec_rfc4175.c
blob: 83abe499f8d391265e57f3d4f10ad130843350e2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/*
 * RTP Depacketization of RAW video (TR-03)
 * Copyright (c) 2016 Savoir-faire Linux, Inc
 *
 * 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
 */

/* Development sponsored by CBC/Radio-Canada */

#include "avio_internal.h"
#include "rtpdec_formats.h"
#include "libavutil/avstring.h"
#include "libavutil/pixdesc.h"
#include "libavutil/parseutils.h"

struct PayloadContext {
    char *sampling;
    AVRational framerate;
    int depth;
    int width;
    int height;
    int interlaced;
    int field;

    uint8_t *frame;
    unsigned int frame_size;
    unsigned int pgroup; /* size of the pixel group in bytes */
    unsigned int xinc;

    uint32_t timestamp;
};

static int rfc4175_parse_format(AVStream *stream, PayloadContext *data)
{
    enum AVPixelFormat pixfmt;
    int tag;
    const AVPixFmtDescriptor *desc;

    if (!strncmp(data->sampling, "YCbCr-4:2:2", 11)) {
        tag = MKTAG('U', 'Y', 'V', 'Y');
        data->xinc = 2;

        if (data->depth == 8) {
            data->pgroup = 4;
            pixfmt = AV_PIX_FMT_UYVY422;
            stream->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
        } else if (data->depth == 10) {
            data->pgroup = 5;
            pixfmt = AV_PIX_FMT_YUV422P10;
            stream->codecpar->codec_id = AV_CODEC_ID_BITPACKED;
        } else {
            return AVERROR_INVALIDDATA;
        }
    } else if (!strncmp(data->sampling, "YCbCr-4:2:0", 11)) {
        tag = MKTAG('I', '4', '2', '0');
        data->xinc = 4;

        if (data->depth == 8) {
            data->pgroup = 6;
            pixfmt = AV_PIX_FMT_YUV420P;
            stream->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
        } else {
            return AVERROR_INVALIDDATA;
        }
    } else if (!strncmp(data->sampling, "RGB", 3)) {
        tag = MKTAG('R', 'G', 'B', 24);
        if (data->depth == 8) {
            data->xinc = 1;
            data->pgroup = 3;
            pixfmt = AV_PIX_FMT_RGB24;
            stream->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
        } else {
            return AVERROR_INVALIDDATA;
        }
    } else if (!strncmp(data->sampling, "BGR", 3)) {
        tag = MKTAG('B', 'G', 'R', 24);
        if (data->depth == 8) {
            data->xinc = 1;
            data->pgroup = 3;
            pixfmt = AV_PIX_FMT_BGR24;
            stream->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
        } else {
            return AVERROR_INVALIDDATA;
        }
    } else {
        return AVERROR_INVALIDDATA;
    }

    desc = av_pix_fmt_desc_get(pixfmt);
    stream->codecpar->format = pixfmt;
    stream->codecpar->codec_tag = tag;
    stream->codecpar->bits_per_coded_sample = av_get_bits_per_pixel(desc);
    data->frame_size = data->width * data->height * data->pgroup / data->xinc;

    if (data->interlaced)
        stream->codecpar->field_order = AV_FIELD_TT;
    else
        stream->codecpar->field_order = AV_FIELD_PROGRESSIVE;

    if (data->framerate.den > 0) {
        stream->avg_frame_rate = data->framerate;
        stream->codecpar->bit_rate = data->frame_size * av_q2d(data->framerate) * 8;
    }

    return 0;
}

static int rfc4175_parse_fmtp(AVFormatContext *s, AVStream *stream,
                              PayloadContext *data, const char *attr,
                              const char *value)
{
    if (!strncmp(attr, "width", 5))
        data->width = atoi(value);
    else if (!strncmp(attr, "height", 6))
        data->height = atoi(value);
    else if (!strncmp(attr, "sampling", 8))
        data->sampling = av_strdup(value);
    else if (!strncmp(attr, "depth", 5))
        data->depth = atoi(value);
    else if (!strncmp(attr, "interlace", 9))
        data->interlaced = 1;
    else if (!strncmp(attr, "exactframerate", 14)) {
        if (av_parse_video_rate(&data->framerate, value) < 0)
            return AVERROR(EINVAL);
    } else if (!strncmp(attr, "TCS", 3)) {
        if (!strncmp(value, "SDR", 3))
            stream->codecpar->color_trc = AVCOL_TRC_BT709;
        else if (!strncmp(value, "PQ", 2))
            stream->codecpar->color_trc = AVCOL_TRC_SMPTE2084;
        else if (!strncmp(value, "HLG", 3))
            stream->codecpar->color_trc = AVCOL_TRC_ARIB_STD_B67;
        else if (!strncmp(value, "LINEAR", 6))
            stream->codecpar->color_trc = AVCOL_TRC_LINEAR;
        else if (!strncmp(value, "ST428-1", 7))
            stream->codecpar->color_trc = AVCOL_TRC_SMPTEST428_1;
        else
            stream->codecpar->color_trc = AVCOL_TRC_UNSPECIFIED;
    } else if (!strncmp(attr, "colorimetry", 11)) {
        if (!strncmp(value, "BT601", 5)) {
            stream->codecpar->color_primaries = AVCOL_PRI_BT470BG;
            stream->codecpar->color_space     = AVCOL_SPC_BT470BG;
        } else if (!strncmp(value, "BT709", 5)) {
            stream->codecpar->color_primaries = AVCOL_PRI_BT709;
            stream->codecpar->color_space     = AVCOL_SPC_BT709;
        } else if (!strncmp(value, "BT2020", 6)) {
            stream->codecpar->color_primaries = AVCOL_PRI_BT2020;
            stream->codecpar->color_space     = AVCOL_SPC_BT2020_NCL;
        }
    } else if (!strncmp(attr, "RANGE", 5)) {
        if (!strncmp(value, "NARROW", 6))
            stream->codecpar->color_range = AVCOL_RANGE_MPEG;
        else if (!strncmp(value, "FULL", 4))
            stream->codecpar->color_range = AVCOL_RANGE_JPEG;
    }

    return 0;
}

static int rfc4175_parse_sdp_line(AVFormatContext *s, int st_index,
                                  PayloadContext *data, const char *line)
{
    const char *p;

    if (st_index < 0)
        return 0;

    if (av_strstart(line, "fmtp:", &p)) {
        AVStream *stream = s->streams[st_index];
        int ret = ff_parse_fmtp(s, stream, data, p, rfc4175_parse_fmtp);

        if (ret < 0)
            return ret;


        if (!data->sampling || !data->depth || !data->width || !data->height)
            return AVERROR(EINVAL);

        stream->codecpar->width = data->width;
        stream->codecpar->height = data->height;

        ret = rfc4175_parse_format(stream, data);
        av_freep(&data->sampling);

        return ret;
    }

    return 0;
}

static int rfc4175_finalize_packet(PayloadContext *data, AVPacket *pkt,
                                   int stream_index)
{
    int ret = 0;

    pkt->stream_index = stream_index;
    if (!data->interlaced || data->field) {
        ret = av_packet_from_data(pkt, data->frame, data->frame_size);
        if (ret < 0) {
            av_freep(&data->frame);
        }
        data->frame = NULL;
    }

    data->field = 0;

    return ret;
}

static int rfc4175_handle_packet(AVFormatContext *ctx, PayloadContext *data,
                                 AVStream *st, AVPacket *pkt, uint32_t *timestamp,
                                 const uint8_t * buf, int len,
                                 uint16_t seq, int flags)
{
    int length, line, offset, cont, field;
    const uint8_t *headers = buf + 2; /* skip extended seqnum */
    const uint8_t *payload = buf + 2;
    int payload_len = len - 2;
    int missed_last_packet = 0;

    uint8_t *dest;

    if (*timestamp != data->timestamp) {
        if (data->frame && (!data->interlaced || data->field)) {
            /*
             * if we're here, it means that we missed the cue to return
             * the previous AVPacket, that cue being the RTP_FLAG_MARKER
             * in the last packet of either the previous frame (progressive)
             * or the previous second field (interlace). Let's finalize the
             * previous frame (or pair of fields) anyway by filling the AVPacket.
             */
            av_log(ctx, AV_LOG_ERROR, "Missed previous RTP Marker\n");
            missed_last_packet = 1;
            rfc4175_finalize_packet(data, pkt, st->index);
        }

        if (!data->frame)
            data->frame = av_malloc(data->frame_size);

        data->timestamp = *timestamp;

        if (!data->frame) {
            av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
            return AVERROR(ENOMEM);
        }
    }

    /*
     * looks for the 'Continuation bit' in scan lines' headers
     * to find where data start
     */
    do {
        if (payload_len < 6)
            return AVERROR_INVALIDDATA;

        cont = payload[4] & 0x80;
        payload += 6;
        payload_len -= 6;
    } while (cont);

    /* and now iterate over every scan lines */
    do {
        int copy_offset;

        if (payload_len < data->pgroup)
            return AVERROR_INVALIDDATA;

        length = (headers[0] << 8) | headers[1];
        field = (headers[2] & 0x80) >> 7;
        line = ((headers[2] & 0x7f) << 8) | headers[3];
        offset = ((headers[4] & 0x7f) << 8) | headers[5];
        cont = headers[4] & 0x80;
        headers += 6;
        data->field = field;

        if (!data->pgroup || length % data->pgroup)
            return AVERROR_INVALIDDATA;

        if (length > payload_len)
            length = payload_len;

        if (data->interlaced)
            line = 2 * line + field;

        /* prevent ill-formed packets to write after buffer's end */
        copy_offset = (line * data->width + offset) * data->pgroup / data->xinc;
        if (copy_offset + length > data->frame_size || !data->frame)
            return AVERROR_INVALIDDATA;

        dest = data->frame + copy_offset;
        memcpy(dest, payload, length);

        payload += length;
        payload_len -= length;
    } while (cont);

    if ((flags & RTP_FLAG_MARKER)) {
        return rfc4175_finalize_packet(data, pkt, st->index);
    } else if (missed_last_packet) {
        return 0;
    }

    return AVERROR(EAGAIN);
}

const RTPDynamicProtocolHandler ff_rfc4175_rtp_handler = {
    .enc_name           = "raw",
    .codec_type         = AVMEDIA_TYPE_VIDEO,
    .codec_id           = AV_CODEC_ID_NONE,
    .priv_data_size     = sizeof(PayloadContext),
    .parse_sdp_a_line   = rfc4175_parse_sdp_line,
    .parse_packet       = rfc4175_handle_packet,
};