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FFmpeg/libavformat/tests/fifo_muxer.c

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/*
* 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"
#include "libavformat/network.h"
#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));
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;
}