fifo_muxer.c 13.2 KB
Newer Older
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
/*
 * FIFO pseudo-muxer
 * Copyright (c) 2016 Jan Sebechlebsky
 *
 * 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 <stdlib.h>
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "libavutil/avassert.h"
#include "libavformat/avformat.h"
#include "libavformat/url.h"
28
#include "libavformat/network.h"
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

#define MAX_TST_PACKETS 128
#define SLEEPTIME_50_MS 50000
#define SLEEPTIME_10_MS 10000

/* Implementation of mock muxer to simulate real muxer failures */

/* This is structure of data sent in packets to
 * failing muxer */
typedef struct FailingMuxerPacketData {
    int ret;             /* return value of write_packet call*/
    int recover_after;   /* set ret to zero after this number of recovery attempts */
    unsigned sleep_time; /* sleep for this long in write_packet to simulate long I/O operation */
} FailingMuxerPacketData;


typedef struct FailingMuxerContext {
    AVClass *class;
    int write_header_ret;
    int write_trailer_ret;
    /* If non-zero, summary of processed packets will be printed in deinit */
    int print_deinit_summary;

    int flush_count;
    int pts_written[MAX_TST_PACKETS];
    int pts_written_nr;
} FailingMuxerContext;

static int failing_write_header(AVFormatContext *avf)
{
    FailingMuxerContext *ctx = avf->priv_data;
    return ctx->write_header_ret;
}

static int failing_write_packet(AVFormatContext *avf, AVPacket *pkt)
{
    FailingMuxerContext *ctx = avf->priv_data;
    int ret = 0;
    if (!pkt) {
        ctx->flush_count++;
    } else {
        FailingMuxerPacketData *data = (FailingMuxerPacketData*) pkt->data;

        if (!data->recover_after) {
            data->ret = 0;
        } else {
            data->recover_after--;
        }

        ret = data->ret;

        if (data->sleep_time) {
            int64_t slept = 0;
            while (slept < data->sleep_time) {
                if (ff_check_interrupt(&avf->interrupt_callback))
                    return AVERROR_EXIT;
                av_usleep(SLEEPTIME_10_MS);
                slept += SLEEPTIME_10_MS;
            }
        }

        if (!ret) {
            ctx->pts_written[ctx->pts_written_nr++] = pkt->pts;
            av_packet_unref(pkt);
        }
    }
    return ret;
}

static int failing_write_trailer(AVFormatContext *avf)
{
    FailingMuxerContext *ctx = avf->priv_data;
    return ctx->write_trailer_ret;
}

static void failing_deinit(AVFormatContext *avf)
{
    int i;
    FailingMuxerContext *ctx = avf->priv_data;

    if (!ctx->print_deinit_summary)
        return;

    printf("flush count: %d\n", ctx->flush_count);
    printf("pts seen nr: %d\n", ctx->pts_written_nr);
    printf("pts seen: ");
    for (i = 0; i < ctx->pts_written_nr; ++i ) {
        printf(i ? ",%d" : "%d", ctx->pts_written[i]);
    }
    printf("\n");
}
#define OFFSET(x) offsetof(FailingMuxerContext, x)
static const AVOption options[] = {
        {"write_header_ret", "write_header() return value", OFFSET(write_header_ret),
         AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
        {"write_trailer_ret", "write_trailer() return value", OFFSET(write_trailer_ret),
         AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
        {"print_deinit_summary", "print summary when deinitializing muxer", OFFSET(print_deinit_summary),
         AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
        {NULL}
    };

static const AVClass failing_muxer_class = {
    .class_name = "Failing test muxer",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVOutputFormat tst_failing_muxer = {
    .name           = "fail",
    .long_name      = NULL_IF_CONFIG_SMALL("Failing test muxer"),
    .priv_data_size = sizeof(FailingMuxerContext),
    .write_header   = failing_write_header,
    .write_packet   = failing_write_packet,
    .write_trailer  = failing_write_trailer,
    .deinit         = failing_deinit,
    .priv_class     = &failing_muxer_class,
    .flags          = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
};

static int prepare_packet(AVPacket *pkt,const FailingMuxerPacketData *pkt_data, int64_t pts)
{
    int ret;
    FailingMuxerPacketData *data = av_malloc(sizeof(*data));
154 155 156
    if (!data) {
        return AVERROR(ENOMEM);
    }
157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447
    memcpy(data, pkt_data, sizeof(FailingMuxerPacketData));
    ret = av_packet_from_data(pkt, (uint8_t*) data, sizeof(*data));

    pkt->pts = pkt->dts = pts;
    pkt->duration = 1;

    return ret;
}

static int initialize_fifo_tst_muxer_chain(AVFormatContext **oc)
{
    int ret = 0;
    AVStream *s;

    ret = avformat_alloc_output_context2(oc, NULL, "fifo", "-");
    if (ret) {
        fprintf(stderr, "Failed to create format context: %s\n",
                av_err2str(ret));
        return EXIT_FAILURE;
    }

    s = avformat_new_stream(*oc, NULL);
    if (!s) {
        fprintf(stderr, "Failed to create stream: %s\n",
                av_err2str(ret));
        ret = AVERROR(ENOMEM);
    }

    return ret;
}

static int fifo_basic_test(AVFormatContext *oc, AVDictionary **opts,
                             const FailingMuxerPacketData *pkt_data)
{
    int ret = 0, i;
    AVPacket pkt;

    av_init_packet(&pkt);


    ret = avformat_write_header(oc, opts);
    if (ret) {
        fprintf(stderr, "Unexpected write_header failure: %s\n",
                av_err2str(ret));
        goto fail;
    }

    for (i = 0; i < 15; i++ ) {
        ret = prepare_packet(&pkt, pkt_data, i);
        if (ret < 0) {
            fprintf(stderr, "Failed to prepare test packet: %s\n",
                    av_err2str(ret));
            goto write_trailer_and_fail;
        }
        ret = av_write_frame(oc, &pkt);
        av_packet_unref(&pkt);
        if (ret < 0) {
            fprintf(stderr, "Unexpected write_frame error: %s\n",
                    av_err2str(ret));
            goto write_trailer_and_fail;
        }
    }

    ret = av_write_frame(oc, NULL);
    if (ret < 0) {
        fprintf(stderr, "Unexpected write_frame error during flushing: %s\n",
                av_err2str(ret));
        goto write_trailer_and_fail;
    }

    ret = av_write_trailer(oc);
    if (ret < 0) {
        fprintf(stderr, "Unexpected write_trailer error during flushing: %s\n",
                av_err2str(ret));
        goto fail;
    }

    return ret;
write_trailer_and_fail:
    av_write_trailer(oc);
fail:
    return ret;
}

static int fifo_write_header_err_tst(AVFormatContext *oc, AVDictionary **opts,
                                     const FailingMuxerPacketData *pkt_data)
{
    int ret = 0, i;
    AVPacket pkt;

    av_init_packet(&pkt);

    ret = avformat_write_header(oc, opts);
    if (ret) {
        fprintf(stderr, "Unexpected write_header failure: %s\n",
                av_err2str(ret));
        goto fail;
    }

    for (i = 0; i < MAX_TST_PACKETS; i++ ) {
        ret = prepare_packet(&pkt, pkt_data, i);
        if (ret < 0) {
            fprintf(stderr, "Failed to prepare test packet: %s\n",
                    av_err2str(ret));
            goto write_trailer_and_fail;
        }
        ret = av_write_frame(oc, &pkt);
        av_packet_unref(&pkt);
        if (ret < 0) {
            break;
        }
    }

    if (!ret) {
        fprintf(stderr, "write_packet not failed when supposed to.\n");
        goto fail;
    } else if (ret != -1) {
        fprintf(stderr, "Unexpected write_packet error: %s\n", av_err2str(ret));
        goto fail;
    }

    ret = av_write_trailer(oc);
    if (ret < 0)
        fprintf(stderr, "Unexpected write_trailer error: %s\n", av_err2str(ret));

    return ret;
write_trailer_and_fail:
    av_write_trailer(oc);
fail:
    return ret;
}

static int fifo_overflow_drop_test(AVFormatContext *oc, AVDictionary **opts,
                                   const FailingMuxerPacketData *data)
{
    int ret = 0, i;
    int64_t write_pkt_start, write_pkt_end, duration;
    AVPacket pkt;

    av_init_packet(&pkt);

    ret = avformat_write_header(oc, opts);
    if (ret) {
        fprintf(stderr, "Unexpected write_header failure: %s\n",
                av_err2str(ret));
        return ret;
    }

    write_pkt_start = av_gettime_relative();
    for (i = 0; i < 6; i++ ) {
        ret = prepare_packet(&pkt, data, i);
        if (ret < 0) {
            fprintf(stderr, "Failed to prepare test packet: %s\n",
                    av_err2str(ret));
            goto fail;
        }
        ret = av_write_frame(oc, &pkt);
        av_packet_unref(&pkt);
        if (ret < 0) {
            break;
        }
    }
    write_pkt_end = av_gettime_relative();
    duration = write_pkt_end - write_pkt_start;
    if (duration > (SLEEPTIME_50_MS*6)/2) {
        fprintf(stderr, "Writing packets to fifo muxer took too much time while testing"
                        "buffer overflow with drop_pkts_on_overflow was on.\n");
        ret = AVERROR_BUG;
        goto fail;
    }

    if (ret) {
        fprintf(stderr, "Unexpected write_packet error: %s\n", av_err2str(ret));
        goto fail;
    }

    ret = av_write_trailer(oc);
    if (ret < 0)
        fprintf(stderr, "Unexpected write_trailer error: %s\n", av_err2str(ret));

    return ret;
fail:
    av_write_trailer(oc);
    return ret;
}

typedef struct TestCase {
    int (*test_func)(AVFormatContext *, AVDictionary **,const FailingMuxerPacketData *pkt_data);
    const char *test_name;
    const char *options;

    uint8_t print_summary_on_deinit;
    int write_header_ret;
    int write_trailer_ret;

    FailingMuxerPacketData pkt_data;
} TestCase;


#define BUFFER_SIZE 64

static int run_test(const TestCase *test)
{
    AVDictionary *opts = NULL;
    AVFormatContext *oc = NULL;
    char buffer[BUFFER_SIZE];
    int ret, ret1;

    ret = initialize_fifo_tst_muxer_chain(&oc);
    if (ret < 0) {
        fprintf(stderr, "Muxer initialization failed: %s\n", av_err2str(ret));
        goto end;
    }

    if (test->options) {
        ret = av_dict_parse_string(&opts, test->options, "=", ":", 0);
        if (ret < 0) {
            fprintf(stderr, "Failed to parse options: %s\n", av_err2str(ret));
            goto end;
        }
    }

    snprintf(buffer, BUFFER_SIZE,
             "print_deinit_summary=%d:write_header_ret=%d:write_trailer_ret=%d",
             (int)test->print_summary_on_deinit, test->write_header_ret,
             test->write_trailer_ret);
    ret = av_dict_set(&opts, "format_opts", buffer, 0);
    ret1 = av_dict_set(&opts, "fifo_format", "fail", 0);
    if (ret < 0 || ret1 < 0) {
        fprintf(stderr, "Failed to set options for test muxer: %s\n",
                av_err2str(ret));
        goto end;
    }

    ret = test->test_func(oc, &opts, &test->pkt_data);

end:
    printf("%s: %s\n", test->test_name, ret < 0 ? "fail" : "ok");
    avformat_free_context(oc);
    av_dict_free(&opts);
    return ret;
}


const TestCase tests[] = {
        /* Simple test in packet-non-dropping mode, we expect to get on the output
         * exactly what was on input */
        {fifo_basic_test, "nonfail test", NULL,1, 0, 0, {0, 0, 0}},

        /* Test that we receive delayed write_header error from one of the write_packet
         * calls. */
        {fifo_write_header_err_tst, "write header error test", NULL, 0, -1, 0, {0, 0, 0}},

        /* Each write_packet will fail 3 times before operation is successful. If recovery
         * Since recovery is on, fifo muxer should not return any errors. */
        {fifo_basic_test, "recovery test", "attempt_recovery=1:recovery_wait_time=0",
         0, 0, 0, {AVERROR(ETIMEDOUT), 3, 0}},

        /* By setting low queue_size and sending packets with longer processing time,
         * this test will cause queue to overflow, since drop_pkts_on_overflow is off
         * by default, all packets should be processed and fifo should block on full
         * queue. */
        {fifo_basic_test, "overflow without packet dropping","queue_size=3",
         1, 0, 0, {0, 0, SLEEPTIME_10_MS}},

        /* The test as the upper one, except that drop_on_overflow is turned on. In this case
         * fifo should not block when the queue is full and slow down producer, so the test
         * measures time producer spends on write_packet calls which should be significantly
         * less than number_of_pkts * 50 MS.
         */
        {fifo_overflow_drop_test, "overflow with packet dropping", "queue_size=3:drop_pkts_on_overflow=1",
         0, 0, 0, {0, 0, SLEEPTIME_50_MS}},

        {NULL}
};

int main(int argc, char *argv[])
{
    int i, ret, ret_all = 0;

    av_register_all();
    av_register_output_format(&tst_failing_muxer);

    for (i = 0; tests[i].test_func; i++) {
        ret = run_test(&tests[i]);
        if (!ret_all && ret < 0)
            ret_all = ret;
    }

    return ret;
}