mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-28 20:26:14 +02:00
668 lines
20 KiB
C
668 lines
20 KiB
C
/*
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* FIFO pseudo-muxer
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* Copyright (c) 2016 Jan Sebechlebsky
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with FFmpeg; if not, write to the Free Software * Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/opt.h"
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#include "libavutil/time.h"
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#include "libavutil/thread.h"
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#include "libavutil/threadmessage.h"
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#include "avformat.h"
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#include "internal.h"
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#define FIFO_DEFAULT_QUEUE_SIZE 60
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#define FIFO_DEFAULT_MAX_RECOVERY_ATTEMPTS 0
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#define FIFO_DEFAULT_RECOVERY_WAIT_TIME_USEC 5000000 // 5 seconds
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typedef struct FifoContext {
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const AVClass *class;
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AVFormatContext *avf;
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char *format;
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char *format_options_str;
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AVDictionary *format_options;
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int queue_size;
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AVThreadMessageQueue *queue;
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pthread_t writer_thread;
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/* Return value of last write_trailer_call */
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int write_trailer_ret;
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/* Time to wait before next recovery attempt
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* This can refer to the time in processed stream,
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* or real time. */
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int64_t recovery_wait_time;
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/* Maximal number of unsuccessful successive recovery attempts */
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int max_recovery_attempts;
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/* Whether to attempt recovery from failure */
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int attempt_recovery;
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/* If >0 stream time will be used when waiting
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* for the recovery attempt instead of real time */
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int recovery_wait_streamtime;
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/* If >0 recovery will be attempted regardless of error code
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* (except AVERROR_EXIT, so exit request is never ignored) */
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int recover_any_error;
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/* Whether to drop packets in case the queue is full. */
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int drop_pkts_on_overflow;
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/* Whether to wait for keyframe when recovering
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* from failure or queue overflow */
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int restart_with_keyframe;
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pthread_mutex_t overflow_flag_lock;
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int overflow_flag_lock_initialized;
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/* Value > 0 signals queue overflow */
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volatile uint8_t overflow_flag;
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} FifoContext;
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typedef struct FifoThreadContext {
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AVFormatContext *avf;
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/* Timestamp of last failure.
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* This is either pts in case stream time is used,
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* or microseconds as returned by av_getttime_relative() */
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int64_t last_recovery_ts;
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/* Number of current recovery process
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* Value > 0 means we are in recovery process */
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int recovery_nr;
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/* If > 0 all frames will be dropped until keyframe is received */
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uint8_t drop_until_keyframe;
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/* Value > 0 means that the previous write_header call was successful
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* so finalization by calling write_trailer and ff_io_close must be done
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* before exiting / reinitialization of underlying muxer */
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uint8_t header_written;
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} FifoThreadContext;
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typedef enum FifoMessageType {
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FIFO_WRITE_HEADER,
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FIFO_WRITE_PACKET,
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FIFO_FLUSH_OUTPUT
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} FifoMessageType;
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typedef struct FifoMessage {
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FifoMessageType type;
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AVPacket pkt;
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} FifoMessage;
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static int fifo_thread_write_header(FifoThreadContext *ctx)
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{
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AVFormatContext *avf = ctx->avf;
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FifoContext *fifo = avf->priv_data;
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AVFormatContext *avf2 = fifo->avf;
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AVDictionary *format_options = NULL;
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int ret, i;
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ret = av_dict_copy(&format_options, fifo->format_options, 0);
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if (ret < 0)
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return ret;
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ret = ff_format_output_open(avf2, avf->url, &format_options);
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if (ret < 0) {
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av_log(avf, AV_LOG_ERROR, "Error opening %s: %s\n", avf->url,
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av_err2str(ret));
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goto end;
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}
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for (i = 0;i < avf2->nb_streams; i++)
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avf2->streams[i]->cur_dts = 0;
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ret = avformat_write_header(avf2, &format_options);
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if (!ret)
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ctx->header_written = 1;
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// Check for options unrecognized by underlying muxer
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if (format_options) {
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AVDictionaryEntry *entry = NULL;
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while ((entry = av_dict_get(format_options, "", entry, AV_DICT_IGNORE_SUFFIX)))
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av_log(avf2, AV_LOG_ERROR, "Unknown option '%s'\n", entry->key);
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ret = AVERROR(EINVAL);
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}
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end:
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av_dict_free(&format_options);
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return ret;
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}
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static int fifo_thread_flush_output(FifoThreadContext *ctx)
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{
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AVFormatContext *avf = ctx->avf;
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FifoContext *fifo = avf->priv_data;
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AVFormatContext *avf2 = fifo->avf;
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return av_write_frame(avf2, NULL);
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}
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static int fifo_thread_write_packet(FifoThreadContext *ctx, AVPacket *pkt)
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{
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AVFormatContext *avf = ctx->avf;
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FifoContext *fifo = avf->priv_data;
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AVFormatContext *avf2 = fifo->avf;
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AVRational src_tb, dst_tb;
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int ret, s_idx;
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if (ctx->drop_until_keyframe) {
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if (pkt->flags & AV_PKT_FLAG_KEY) {
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ctx->drop_until_keyframe = 0;
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av_log(avf, AV_LOG_VERBOSE, "Keyframe received, recovering...\n");
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} else {
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av_log(avf, AV_LOG_VERBOSE, "Dropping non-keyframe packet\n");
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av_packet_unref(pkt);
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return 0;
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}
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}
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s_idx = pkt->stream_index;
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src_tb = avf->streams[s_idx]->time_base;
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dst_tb = avf2->streams[s_idx]->time_base;
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av_packet_rescale_ts(pkt, src_tb, dst_tb);
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ret = av_write_frame(avf2, pkt);
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if (ret >= 0)
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av_packet_unref(pkt);
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return ret;
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}
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static int fifo_thread_write_trailer(FifoThreadContext *ctx)
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{
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AVFormatContext *avf = ctx->avf;
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FifoContext *fifo = avf->priv_data;
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AVFormatContext *avf2 = fifo->avf;
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int ret;
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if (!ctx->header_written)
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return 0;
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ret = av_write_trailer(avf2);
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ff_format_io_close(avf2, &avf2->pb);
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return ret;
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}
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static int fifo_thread_dispatch_message(FifoThreadContext *ctx, FifoMessage *msg)
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{
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int ret = AVERROR(EINVAL);
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if (!ctx->header_written) {
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ret = fifo_thread_write_header(ctx);
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if (ret < 0)
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return ret;
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}
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switch(msg->type) {
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case FIFO_WRITE_HEADER:
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av_assert0(ret >= 0);
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return ret;
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case FIFO_WRITE_PACKET:
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return fifo_thread_write_packet(ctx, &msg->pkt);
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case FIFO_FLUSH_OUTPUT:
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return fifo_thread_flush_output(ctx);
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}
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av_assert0(0);
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return AVERROR(EINVAL);
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}
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static int is_recoverable(const FifoContext *fifo, int err_no) {
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if (!fifo->attempt_recovery)
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return 0;
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if (fifo->recover_any_error)
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return err_no != AVERROR_EXIT;
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switch (err_no) {
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case AVERROR(EINVAL):
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case AVERROR(ENOSYS):
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case AVERROR_EOF:
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case AVERROR_EXIT:
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case AVERROR_PATCHWELCOME:
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return 0;
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default:
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return 1;
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}
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}
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static void free_message(void *msg)
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{
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FifoMessage *fifo_msg = msg;
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if (fifo_msg->type == FIFO_WRITE_PACKET)
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av_packet_unref(&fifo_msg->pkt);
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}
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static int fifo_thread_process_recovery_failure(FifoThreadContext *ctx, AVPacket *pkt,
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int err_no)
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{
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AVFormatContext *avf = ctx->avf;
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FifoContext *fifo = avf->priv_data;
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int ret;
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av_log(avf, AV_LOG_INFO, "Recovery failed: %s\n",
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av_err2str(err_no));
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if (fifo->recovery_wait_streamtime) {
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if (pkt->pts == AV_NOPTS_VALUE)
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av_log(avf, AV_LOG_WARNING, "Packet does not contain presentation"
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" timestamp, recovery will be attempted immediately");
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ctx->last_recovery_ts = pkt->pts;
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} else {
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ctx->last_recovery_ts = av_gettime_relative();
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}
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if (fifo->max_recovery_attempts &&
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ctx->recovery_nr >= fifo->max_recovery_attempts) {
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av_log(avf, AV_LOG_ERROR,
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"Maximal number of %d recovery attempts reached.\n",
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fifo->max_recovery_attempts);
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ret = err_no;
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} else {
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ret = AVERROR(EAGAIN);
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}
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return ret;
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}
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static int fifo_thread_attempt_recovery(FifoThreadContext *ctx, FifoMessage *msg, int err_no)
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{
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AVFormatContext *avf = ctx->avf;
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FifoContext *fifo = avf->priv_data;
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AVPacket *pkt = &msg->pkt;
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int64_t time_since_recovery;
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int ret;
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if (!is_recoverable(fifo, err_no)) {
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ret = err_no;
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goto fail;
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}
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if (ctx->header_written) {
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fifo->write_trailer_ret = fifo_thread_write_trailer(ctx);
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ctx->header_written = 0;
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}
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if (!ctx->recovery_nr) {
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ctx->last_recovery_ts = fifo->recovery_wait_streamtime ?
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AV_NOPTS_VALUE : 0;
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} else {
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if (fifo->recovery_wait_streamtime) {
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if (ctx->last_recovery_ts == AV_NOPTS_VALUE) {
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AVRational tb = avf->streams[pkt->stream_index]->time_base;
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time_since_recovery = av_rescale_q(pkt->pts - ctx->last_recovery_ts,
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tb, AV_TIME_BASE_Q);
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} else {
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/* Enforce recovery immediately */
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time_since_recovery = fifo->recovery_wait_time;
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}
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} else {
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time_since_recovery = av_gettime_relative() - ctx->last_recovery_ts;
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}
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if (time_since_recovery < fifo->recovery_wait_time)
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return AVERROR(EAGAIN);
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}
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ctx->recovery_nr++;
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if (fifo->max_recovery_attempts) {
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av_log(avf, AV_LOG_VERBOSE, "Recovery attempt #%d/%d\n",
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ctx->recovery_nr, fifo->max_recovery_attempts);
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} else {
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av_log(avf, AV_LOG_VERBOSE, "Recovery attempt #%d\n",
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ctx->recovery_nr);
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}
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if (fifo->restart_with_keyframe && fifo->drop_pkts_on_overflow)
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ctx->drop_until_keyframe = 1;
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ret = fifo_thread_dispatch_message(ctx, msg);
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if (ret < 0) {
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if (is_recoverable(fifo, ret)) {
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return fifo_thread_process_recovery_failure(ctx, pkt, ret);
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} else {
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goto fail;
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}
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} else {
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av_log(avf, AV_LOG_INFO, "Recovery successful\n");
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ctx->recovery_nr = 0;
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}
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return 0;
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fail:
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free_message(msg);
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return ret;
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}
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static int fifo_thread_recover(FifoThreadContext *ctx, FifoMessage *msg, int err_no)
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{
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AVFormatContext *avf = ctx->avf;
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FifoContext *fifo = avf->priv_data;
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int ret;
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do {
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if (!fifo->recovery_wait_streamtime && ctx->recovery_nr > 0) {
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int64_t time_since_recovery = av_gettime_relative() - ctx->last_recovery_ts;
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int64_t time_to_wait = FFMAX(0, fifo->recovery_wait_time - time_since_recovery);
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if (time_to_wait)
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av_usleep(FFMIN(10000, time_to_wait));
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}
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ret = fifo_thread_attempt_recovery(ctx, msg, err_no);
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} while (ret == AVERROR(EAGAIN) && !fifo->drop_pkts_on_overflow);
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if (ret == AVERROR(EAGAIN) && fifo->drop_pkts_on_overflow) {
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if (msg->type == FIFO_WRITE_PACKET)
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av_packet_unref(&msg->pkt);
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ret = 0;
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}
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return ret;
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}
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static void *fifo_consumer_thread(void *data)
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{
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AVFormatContext *avf = data;
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FifoContext *fifo = avf->priv_data;
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AVThreadMessageQueue *queue = fifo->queue;
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FifoMessage msg = {FIFO_WRITE_HEADER, {0}};
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int ret;
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FifoThreadContext fifo_thread_ctx;
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memset(&fifo_thread_ctx, 0, sizeof(FifoThreadContext));
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fifo_thread_ctx.avf = avf;
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while (1) {
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uint8_t just_flushed = 0;
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if (!fifo_thread_ctx.recovery_nr)
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ret = fifo_thread_dispatch_message(&fifo_thread_ctx, &msg);
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if (ret < 0 || fifo_thread_ctx.recovery_nr > 0) {
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int rec_ret = fifo_thread_recover(&fifo_thread_ctx, &msg, ret);
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if (rec_ret < 0) {
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av_thread_message_queue_set_err_send(queue, rec_ret);
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break;
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}
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}
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/* If the queue is full at the moment when fifo_write_packet
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* attempts to insert new message (packet) to the queue,
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* it sets the fifo->overflow_flag to 1 and drops packet.
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* Here in consumer thread, the flag is checked and if it is
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* set, the queue is flushed and flag cleared. */
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pthread_mutex_lock(&fifo->overflow_flag_lock);
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if (fifo->overflow_flag) {
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av_thread_message_flush(queue);
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if (fifo->restart_with_keyframe)
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fifo_thread_ctx.drop_until_keyframe = 1;
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fifo->overflow_flag = 0;
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just_flushed = 1;
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}
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pthread_mutex_unlock(&fifo->overflow_flag_lock);
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if (just_flushed)
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av_log(avf, AV_LOG_INFO, "FIFO queue flushed\n");
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ret = av_thread_message_queue_recv(queue, &msg, 0);
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if (ret < 0) {
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av_thread_message_queue_set_err_send(queue, ret);
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break;
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}
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}
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fifo->write_trailer_ret = fifo_thread_write_trailer(&fifo_thread_ctx);
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return NULL;
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}
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static int fifo_mux_init(AVFormatContext *avf, ff_const59 AVOutputFormat *oformat,
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const char *filename)
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{
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FifoContext *fifo = avf->priv_data;
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AVFormatContext *avf2;
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int ret = 0, i;
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ret = avformat_alloc_output_context2(&avf2, oformat, NULL, filename);
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if (ret < 0)
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return ret;
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fifo->avf = avf2;
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avf2->interrupt_callback = avf->interrupt_callback;
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avf2->max_delay = avf->max_delay;
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ret = av_dict_copy(&avf2->metadata, avf->metadata, 0);
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if (ret < 0)
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return ret;
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avf2->opaque = avf->opaque;
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avf2->io_close = avf->io_close;
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avf2->io_open = avf->io_open;
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avf2->flags = avf->flags;
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for (i = 0; i < avf->nb_streams; ++i) {
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AVStream *st = avformat_new_stream(avf2, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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ret = ff_stream_encode_params_copy(st, avf->streams[i]);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int fifo_init(AVFormatContext *avf)
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{
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FifoContext *fifo = avf->priv_data;
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ff_const59 AVOutputFormat *oformat;
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int ret = 0;
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if (fifo->recovery_wait_streamtime && !fifo->drop_pkts_on_overflow) {
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av_log(avf, AV_LOG_ERROR, "recovery_wait_streamtime can be turned on"
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" only when drop_pkts_on_overflow is also turned on\n");
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return AVERROR(EINVAL);
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}
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if (fifo->format_options_str) {
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ret = av_dict_parse_string(&fifo->format_options, fifo->format_options_str,
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"=", ":", 0);
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if (ret < 0) {
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av_log(avf, AV_LOG_ERROR, "Could not parse format options list '%s'\n",
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fifo->format_options_str);
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return ret;
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}
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}
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oformat = av_guess_format(fifo->format, avf->url, NULL);
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if (!oformat) {
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ret = AVERROR_MUXER_NOT_FOUND;
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return ret;
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}
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ret = fifo_mux_init(avf, oformat, avf->url);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = av_thread_message_queue_alloc(&fifo->queue, (unsigned) fifo->queue_size,
|
|
sizeof(FifoMessage));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
av_thread_message_queue_set_free_func(fifo->queue, free_message);
|
|
|
|
ret = pthread_mutex_init(&fifo->overflow_flag_lock, NULL);
|
|
if (ret < 0)
|
|
return AVERROR(ret);
|
|
fifo->overflow_flag_lock_initialized = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fifo_write_header(AVFormatContext *avf)
|
|
{
|
|
FifoContext * fifo = avf->priv_data;
|
|
int ret;
|
|
|
|
ret = pthread_create(&fifo->writer_thread, NULL, fifo_consumer_thread, avf);
|
|
if (ret) {
|
|
av_log(avf, AV_LOG_ERROR, "Failed to start thread: %s\n",
|
|
av_err2str(AVERROR(ret)));
|
|
ret = AVERROR(ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int fifo_write_packet(AVFormatContext *avf, AVPacket *pkt)
|
|
{
|
|
FifoContext *fifo = avf->priv_data;
|
|
FifoMessage msg = {.type = pkt ? FIFO_WRITE_PACKET : FIFO_FLUSH_OUTPUT};
|
|
int ret;
|
|
|
|
if (pkt) {
|
|
av_init_packet(&msg.pkt);
|
|
ret = av_packet_ref(&msg.pkt,pkt);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
ret = av_thread_message_queue_send(fifo->queue, &msg,
|
|
fifo->drop_pkts_on_overflow ?
|
|
AV_THREAD_MESSAGE_NONBLOCK : 0);
|
|
if (ret == AVERROR(EAGAIN)) {
|
|
uint8_t overflow_set = 0;
|
|
|
|
/* Queue is full, set fifo->overflow_flag to 1
|
|
* to let consumer thread know the queue should
|
|
* be flushed. */
|
|
pthread_mutex_lock(&fifo->overflow_flag_lock);
|
|
if (!fifo->overflow_flag)
|
|
fifo->overflow_flag = overflow_set = 1;
|
|
pthread_mutex_unlock(&fifo->overflow_flag_lock);
|
|
|
|
if (overflow_set)
|
|
av_log(avf, AV_LOG_WARNING, "FIFO queue full\n");
|
|
ret = 0;
|
|
goto fail;
|
|
} else if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
return ret;
|
|
fail:
|
|
if (pkt)
|
|
av_packet_unref(&msg.pkt);
|
|
return ret;
|
|
}
|
|
|
|
static int fifo_write_trailer(AVFormatContext *avf)
|
|
{
|
|
FifoContext *fifo= avf->priv_data;
|
|
int ret;
|
|
|
|
av_thread_message_queue_set_err_recv(fifo->queue, AVERROR_EOF);
|
|
|
|
ret = pthread_join(fifo->writer_thread, NULL);
|
|
if (ret < 0) {
|
|
av_log(avf, AV_LOG_ERROR, "pthread join error: %s\n",
|
|
av_err2str(AVERROR(ret)));
|
|
return AVERROR(ret);
|
|
}
|
|
|
|
ret = fifo->write_trailer_ret;
|
|
return ret;
|
|
}
|
|
|
|
static void fifo_deinit(AVFormatContext *avf)
|
|
{
|
|
FifoContext *fifo = avf->priv_data;
|
|
|
|
av_dict_free(&fifo->format_options);
|
|
avformat_free_context(fifo->avf);
|
|
av_thread_message_queue_free(&fifo->queue);
|
|
if (fifo->overflow_flag_lock_initialized)
|
|
pthread_mutex_destroy(&fifo->overflow_flag_lock);
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(FifoContext, x)
|
|
static const AVOption options[] = {
|
|
{"fifo_format", "Target muxer", OFFSET(format),
|
|
AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM},
|
|
|
|
{"queue_size", "Size of fifo queue", OFFSET(queue_size),
|
|
AV_OPT_TYPE_INT, {.i64 = FIFO_DEFAULT_QUEUE_SIZE}, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
|
|
|
|
{"format_opts", "Options to be passed to underlying muxer", OFFSET(format_options_str),
|
|
AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM},
|
|
|
|
{"drop_pkts_on_overflow", "Drop packets on fifo queue overflow not to block encoder", OFFSET(drop_pkts_on_overflow),
|
|
AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
|
|
|
|
{"restart_with_keyframe", "Wait for keyframe when restarting output", OFFSET(restart_with_keyframe),
|
|
AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
|
|
|
|
{"attempt_recovery", "Attempt recovery in case of failure", OFFSET(attempt_recovery),
|
|
AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
|
|
|
|
{"max_recovery_attempts", "Maximal number of recovery attempts", OFFSET(max_recovery_attempts),
|
|
AV_OPT_TYPE_INT, {.i64 = FIFO_DEFAULT_MAX_RECOVERY_ATTEMPTS}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
|
|
|
|
{"recovery_wait_time", "Waiting time between recovery attempts", OFFSET(recovery_wait_time),
|
|
AV_OPT_TYPE_DURATION, {.i64 = FIFO_DEFAULT_RECOVERY_WAIT_TIME_USEC}, 0, INT64_MAX, AV_OPT_FLAG_ENCODING_PARAM},
|
|
|
|
{"recovery_wait_streamtime", "Use stream time instead of real time while waiting for recovery",
|
|
OFFSET(recovery_wait_streamtime), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
|
|
|
|
{"recover_any_error", "Attempt recovery regardless of type of the error", OFFSET(recover_any_error),
|
|
AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
|
|
|
|
{NULL},
|
|
};
|
|
|
|
static const AVClass fifo_muxer_class = {
|
|
.class_name = "Fifo muxer",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVOutputFormat ff_fifo_muxer = {
|
|
.name = "fifo",
|
|
.long_name = NULL_IF_CONFIG_SMALL("FIFO queue pseudo-muxer"),
|
|
.priv_data_size = sizeof(FifoContext),
|
|
.init = fifo_init,
|
|
.write_header = fifo_write_header,
|
|
.write_packet = fifo_write_packet,
|
|
.write_trailer = fifo_write_trailer,
|
|
.deinit = fifo_deinit,
|
|
.priv_class = &fifo_muxer_class,
|
|
.flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH | AVFMT_TS_NEGATIVE,
|
|
};
|