1c82c3923d
The PTS received from MediaCodec are expressed relative to an arbitrary clock origin. We consider the PTS of the first frame to be 0, and the PTS of every other frame is relative to this first PTS (note that the PTS is only used for recording, it is ignored for mirroring). For simplicity, this relative PTS was computed on the server-side. To prepare support for multiple stream (video and audio), send the packet with its original PTS, and handle the PTS offset on the client-side (by the recorder). Since we can't know in advance which stream will produce the first packet with the lowest PTS (a packet received later on one stream may have a PTS lower than a packet received earlier on another stream), computing the PTS on the server-side would require unnecessary waiting.
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
#ifndef SC_RECORDER_H
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#define SC_RECORDER_H
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#include "common.h"
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#include <stdbool.h>
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#include <libavformat/avformat.h>
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#include "coords.h"
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#include "options.h"
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#include "trait/packet_sink.h"
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#include "util/queue.h"
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#include "util/thread.h"
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struct sc_record_packet {
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AVPacket *packet;
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struct sc_record_packet *next;
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};
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struct sc_recorder_queue SC_QUEUE(struct sc_record_packet);
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struct sc_recorder {
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struct sc_packet_sink packet_sink; // packet sink trait
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char *filename;
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enum sc_record_format format;
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AVFormatContext *ctx;
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struct sc_size declared_frame_size;
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bool header_written;
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uint64_t pts_origin;
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sc_thread thread;
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sc_mutex mutex;
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sc_cond queue_cond;
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bool stopped; // set on recorder_close()
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bool failed; // set on packet write failure
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struct sc_recorder_queue queue;
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// we can write a packet only once we received the next one so that we can
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// set its duration (next_pts - current_pts)
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// "previous" is only accessed from the recorder thread, so it does not
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// need to be protected by the mutex
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struct sc_record_packet *previous;
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};
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bool
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sc_recorder_init(struct sc_recorder *recorder, const char *filename,
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enum sc_record_format format,
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struct sc_size declared_frame_size);
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void
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sc_recorder_destroy(struct sc_recorder *recorder);
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#endif
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