scrcpy/app/src/recorder.c
Romain Vimont 13a3395a33 Disable audio on initialization error
By default, audio is enabled (--no-audio must be explicitly passed to
disable it).

However, some devices may not support audio capture (typically devices
below Android 11, or Android 11 when the shell application is not
foreground on start).

In that case, make the server notify the client to dynamically disable
audio forwarding so that it does not wait indefinitely for an audio
stream.

Also disable audio on unknown codec or missing decoder on the
client-side, for the same reasons.

PR #3757 <https://github.com/Genymobile/scrcpy/pull/3757>
2023-03-10 22:22:15 +01:00

779 lines
22 KiB
C

#include "recorder.h"
#include <assert.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/time.h>
#include "util/log.h"
#include "util/str.h"
/** Downcast packet sinks to recorder */
#define DOWNCAST_VIDEO(SINK) \
container_of(SINK, struct sc_recorder, video_packet_sink)
#define DOWNCAST_AUDIO(SINK) \
container_of(SINK, struct sc_recorder, audio_packet_sink)
static const AVRational SCRCPY_TIME_BASE = {1, 1000000}; // timestamps in us
static const AVOutputFormat *
find_muxer(const char *name) {
#ifdef SCRCPY_LAVF_HAS_NEW_MUXER_ITERATOR_API
void *opaque = NULL;
#endif
const AVOutputFormat *oformat = NULL;
do {
#ifdef SCRCPY_LAVF_HAS_NEW_MUXER_ITERATOR_API
oformat = av_muxer_iterate(&opaque);
#else
oformat = av_oformat_next(oformat);
#endif
// until null or containing the requested name
} while (oformat && !sc_str_list_contains(oformat->name, ',', name));
return oformat;
}
static struct sc_record_packet *
sc_record_packet_new(const AVPacket *packet) {
struct sc_record_packet *rec = malloc(sizeof(*rec));
if (!rec) {
LOG_OOM();
return NULL;
}
rec->packet = av_packet_alloc();
if (!rec->packet) {
LOG_OOM();
free(rec);
return NULL;
}
if (av_packet_ref(rec->packet, packet)) {
av_packet_free(&rec->packet);
free(rec);
return NULL;
}
return rec;
}
static void
sc_record_packet_delete(struct sc_record_packet *rec) {
av_packet_free(&rec->packet);
free(rec);
}
static void
sc_recorder_queue_clear(struct sc_recorder_queue *queue) {
while (!sc_queue_is_empty(queue)) {
struct sc_record_packet *rec;
sc_queue_take(queue, next, &rec);
sc_record_packet_delete(rec);
}
}
static const char *
sc_recorder_get_format_name(enum sc_record_format format) {
switch (format) {
case SC_RECORD_FORMAT_MP4: return "mp4";
case SC_RECORD_FORMAT_MKV: return "matroska";
default: return NULL;
}
}
static bool
sc_recorder_set_extradata(AVStream *ostream, const AVPacket *packet) {
uint8_t *extradata = av_malloc(packet->size * sizeof(uint8_t));
if (!extradata) {
LOG_OOM();
return false;
}
// copy the first packet to the extra data
memcpy(extradata, packet->data, packet->size);
ostream->codecpar->extradata = extradata;
ostream->codecpar->extradata_size = packet->size;
return true;
}
static inline void
sc_recorder_rescale_packet(AVStream *stream, AVPacket *packet) {
av_packet_rescale_ts(packet, SCRCPY_TIME_BASE, stream->time_base);
}
static bool
sc_recorder_write_stream(struct sc_recorder *recorder, int stream_index,
AVPacket *packet) {
AVStream *stream = recorder->ctx->streams[stream_index];
sc_recorder_rescale_packet(stream, packet);
return av_interleaved_write_frame(recorder->ctx, packet) >= 0;
}
static inline bool
sc_recorder_write_video(struct sc_recorder *recorder, AVPacket *packet) {
return sc_recorder_write_stream(recorder, recorder->video_stream_index,
packet);
}
static inline bool
sc_recorder_write_audio(struct sc_recorder *recorder, AVPacket *packet) {
return sc_recorder_write_stream(recorder, recorder->audio_stream_index,
packet);
}
static bool
sc_recorder_open_output_file(struct sc_recorder *recorder) {
const char *format_name = sc_recorder_get_format_name(recorder->format);
assert(format_name);
const AVOutputFormat *format = find_muxer(format_name);
if (!format) {
LOGE("Could not find muxer");
return false;
}
recorder->ctx = avformat_alloc_context();
if (!recorder->ctx) {
LOG_OOM();
return false;
}
int ret = avio_open(&recorder->ctx->pb, recorder->filename,
AVIO_FLAG_WRITE);
if (ret < 0) {
LOGE("Failed to open output file: %s", recorder->filename);
avformat_free_context(recorder->ctx);
return false;
}
// contrary to the deprecated API (av_oformat_next()), av_muxer_iterate()
// returns (on purpose) a pointer-to-const, but AVFormatContext.oformat
// still expects a pointer-to-non-const (it has not be updated accordingly)
// <https://github.com/FFmpeg/FFmpeg/commit/0694d8702421e7aff1340038559c438b61bb30dd>
recorder->ctx->oformat = (AVOutputFormat *) format;
av_dict_set(&recorder->ctx->metadata, "comment",
"Recorded by scrcpy " SCRCPY_VERSION, 0);
LOGI("Recording started to %s file: %s", format_name, recorder->filename);
return true;
}
static void
sc_recorder_close_output_file(struct sc_recorder *recorder) {
avio_close(recorder->ctx->pb);
avformat_free_context(recorder->ctx);
}
static bool
sc_recorder_wait_video_stream(struct sc_recorder *recorder) {
sc_mutex_lock(&recorder->mutex);
while (!recorder->video_codec && !recorder->stopped) {
sc_cond_wait(&recorder->stream_cond, &recorder->mutex);
}
const AVCodec *codec = recorder->video_codec;
sc_mutex_unlock(&recorder->mutex);
if (codec) {
AVStream *stream = avformat_new_stream(recorder->ctx, codec);
if (!stream) {
return false;
}
stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
stream->codecpar->codec_id = codec->id;
stream->codecpar->format = AV_PIX_FMT_YUV420P;
stream->codecpar->width = recorder->declared_frame_size.width;
stream->codecpar->height = recorder->declared_frame_size.height;
recorder->video_stream_index = stream->index;
}
return true;
}
static bool
sc_recorder_wait_audio_stream(struct sc_recorder *recorder) {
sc_mutex_lock(&recorder->mutex);
while (!recorder->audio_codec && !recorder->audio_disabled
&& !recorder->stopped) {
sc_cond_wait(&recorder->stream_cond, &recorder->mutex);
}
if (recorder->audio_disabled) {
// Reset audio flag. From there, the recorder thread may access this
// flag without any mutex.
recorder->audio = false;
}
const AVCodec *codec = recorder->audio_codec;
sc_mutex_unlock(&recorder->mutex);
if (codec) {
AVStream *stream = avformat_new_stream(recorder->ctx, codec);
if (!stream) {
return false;
}
stream->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
stream->codecpar->codec_id = codec->id;
stream->codecpar->ch_layout.nb_channels = 2;
stream->codecpar->sample_rate = 48000;
recorder->audio_stream_index = stream->index;
}
return true;
}
static inline bool
sc_recorder_has_empty_queues(struct sc_recorder *recorder) {
if (sc_queue_is_empty(&recorder->video_queue)) {
// The video queue is empty
return true;
}
if (recorder->audio && sc_queue_is_empty(&recorder->audio_queue)) {
// The audio queue is empty (when audio is enabled)
return true;
}
// No queue is empty
return false;
}
static bool
sc_recorder_process_header(struct sc_recorder *recorder) {
sc_mutex_lock(&recorder->mutex);
while (!recorder->stopped && sc_recorder_has_empty_queues(recorder)) {
sc_cond_wait(&recorder->queue_cond, &recorder->mutex);
}
if (sc_recorder_has_empty_queues(recorder)) {
assert(recorder->stopped);
sc_mutex_unlock(&recorder->mutex);
return false;
}
struct sc_record_packet *video_pkt;
sc_queue_take(&recorder->video_queue, next, &video_pkt);
struct sc_record_packet *audio_pkt;
if (recorder->audio) {
sc_queue_take(&recorder->audio_queue, next, &audio_pkt);
}
sc_mutex_unlock(&recorder->mutex);
int ret = false;
if (video_pkt->packet->pts != AV_NOPTS_VALUE) {
LOGE("The first video packet is not a config packet");
goto end;
}
assert(recorder->video_stream_index >= 0);
AVStream *video_stream =
recorder->ctx->streams[recorder->video_stream_index];
bool ok = sc_recorder_set_extradata(video_stream, video_pkt->packet);
if (!ok) {
goto end;
}
if (recorder->audio) {
if (audio_pkt->packet->pts != AV_NOPTS_VALUE) {
LOGE("The first audio packet is not a config packet");
goto end;
}
assert(recorder->audio_stream_index >= 0);
AVStream *audio_stream =
recorder->ctx->streams[recorder->audio_stream_index];
ok = sc_recorder_set_extradata(audio_stream, audio_pkt->packet);
if (!ok) {
goto end;
}
}
ok = avformat_write_header(recorder->ctx, NULL) >= 0;
if (!ok) {
LOGE("Failed to write header to %s", recorder->filename);
goto end;
}
ret = true;
end:
sc_record_packet_delete(video_pkt);
if (recorder->audio) {
sc_record_packet_delete(audio_pkt);
}
return ret;
}
static bool
sc_recorder_process_packets(struct sc_recorder *recorder) {
int64_t pts_origin = AV_NOPTS_VALUE;
bool header_written = sc_recorder_process_header(recorder);
if (!header_written) {
return false;
}
struct sc_record_packet *video_pkt = NULL;
struct sc_record_packet *audio_pkt = NULL;
// We can write a video packet only once we received the next one so that
// we can set its duration (next_pts - current_pts)
struct sc_record_packet *video_pkt_previous = NULL;
bool error = false;
for (;;) {
sc_mutex_lock(&recorder->mutex);
while (!recorder->stopped) {
if (!video_pkt && !sc_queue_is_empty(&recorder->video_queue)) {
// A new packet may be assigned to video_pkt and be processed
break;
}
if (recorder->audio && !audio_pkt
&& !sc_queue_is_empty(&recorder->audio_queue)) {
// A new packet may be assigned to audio_pkt and be processed
break;
}
sc_cond_wait(&recorder->queue_cond, &recorder->mutex);
}
// If stopped is set, continue to process the remaining events (to
// finish the recording) before actually stopping.
// If there is no audio, then the audio_queue will remain empty forever
// and audio_pkt will always be NULL.
assert(recorder->audio
|| (!audio_pkt && sc_queue_is_empty(&recorder->audio_queue)));
if (!video_pkt && !sc_queue_is_empty(&recorder->video_queue)) {
sc_queue_take(&recorder->video_queue, next, &video_pkt);
}
if (!audio_pkt && !sc_queue_is_empty(&recorder->audio_queue)) {
sc_queue_take(&recorder->audio_queue, next, &audio_pkt);
}
if (recorder->stopped && !video_pkt && !audio_pkt) {
assert(sc_queue_is_empty(&recorder->video_queue));
assert(sc_queue_is_empty(&recorder->audio_queue));
sc_mutex_unlock(&recorder->mutex);
break;
}
assert(video_pkt || audio_pkt); // at least one
sc_mutex_unlock(&recorder->mutex);
// Ignore further config packets (e.g. on device orientation
// change). The next non-config packet will have the config packet
// data prepended.
if (video_pkt && video_pkt->packet->pts == AV_NOPTS_VALUE) {
sc_record_packet_delete(video_pkt);
video_pkt = NULL;
}
if (audio_pkt && audio_pkt->packet->pts == AV_NOPTS_VALUE) {
sc_record_packet_delete(audio_pkt);
audio_pkt= NULL;
}
if (pts_origin == AV_NOPTS_VALUE) {
if (!recorder->audio) {
assert(video_pkt);
pts_origin = video_pkt->packet->pts;
} else if (video_pkt && audio_pkt) {
pts_origin =
MIN(video_pkt->packet->pts, audio_pkt->packet->pts);
} else {
// We need both video and audio packets to initialize pts_origin
continue;
}
}
assert(pts_origin != AV_NOPTS_VALUE);
if (video_pkt) {
video_pkt->packet->pts -= pts_origin;
video_pkt->packet->dts = video_pkt->packet->pts;
if (video_pkt_previous) {
// we now know the duration of the previous packet
video_pkt_previous->packet->duration =
video_pkt->packet->pts - video_pkt_previous->packet->pts;
bool ok = sc_recorder_write_video(recorder,
video_pkt_previous->packet);
sc_record_packet_delete(video_pkt_previous);
if (!ok) {
LOGE("Could not record video packet");
error = true;
goto end;
}
}
video_pkt_previous = video_pkt;
video_pkt = NULL;
}
if (audio_pkt) {
audio_pkt->packet->pts -= pts_origin;
audio_pkt->packet->dts = audio_pkt->packet->pts;
bool ok = sc_recorder_write_audio(recorder, audio_pkt->packet);
if (!ok) {
LOGE("Could not record audio packet");
error = true;
goto end;
}
sc_record_packet_delete(audio_pkt);
audio_pkt = NULL;
}
}
// Write the last video packet
struct sc_record_packet *last = video_pkt_previous;
if (last) {
// assign an arbitrary duration to the last packet
last->packet->duration = 100000;
bool ok = sc_recorder_write_video(recorder, last->packet);
if (!ok) {
// failing to write the last frame is not very serious, no
// future frame may depend on it, so the resulting file
// will still be valid
LOGW("Could not record last packet");
}
sc_record_packet_delete(last);
}
int ret = av_write_trailer(recorder->ctx);
if (ret < 0) {
LOGE("Failed to write trailer to %s", recorder->filename);
error = false;
}
end:
if (video_pkt) {
sc_record_packet_delete(video_pkt);
}
if (audio_pkt) {
sc_record_packet_delete(audio_pkt);
}
return !error;
}
static bool
sc_recorder_record(struct sc_recorder *recorder) {
bool ok = sc_recorder_open_output_file(recorder);
if (!ok) {
return false;
}
ok = sc_recorder_wait_video_stream(recorder);
if (!ok) {
sc_recorder_close_output_file(recorder);
return false;
}
if (recorder->audio) {
ok = sc_recorder_wait_audio_stream(recorder);
if (!ok) {
sc_recorder_close_output_file(recorder);
return false;
}
}
// If recorder->stopped, process any queued packet anyway
ok = sc_recorder_process_packets(recorder);
sc_recorder_close_output_file(recorder);
return ok;
}
static int
run_recorder(void *data) {
struct sc_recorder *recorder = data;
bool success = sc_recorder_record(recorder);
sc_mutex_lock(&recorder->mutex);
// Prevent the producer to push any new packet
recorder->stopped = true;
// Discard pending packets
sc_recorder_queue_clear(&recorder->video_queue);
sc_recorder_queue_clear(&recorder->audio_queue);
sc_mutex_unlock(&recorder->mutex);
if (success) {
const char *format_name = sc_recorder_get_format_name(recorder->format);
LOGI("Recording complete to %s file: %s", format_name,
recorder->filename);
} else {
LOGE("Recording failed to %s", recorder->filename);
}
LOGD("Recorder thread ended");
recorder->cbs->on_ended(recorder, success, recorder->cbs_userdata);
return 0;
}
static bool
sc_recorder_video_packet_sink_open(struct sc_packet_sink *sink,
const AVCodec *codec) {
struct sc_recorder *recorder = DOWNCAST_VIDEO(sink);
assert(codec);
sc_mutex_lock(&recorder->mutex);
if (recorder->stopped) {
sc_mutex_unlock(&recorder->mutex);
return false;
}
recorder->video_codec = codec;
sc_cond_signal(&recorder->stream_cond);
sc_mutex_unlock(&recorder->mutex);
return true;
}
static void
sc_recorder_video_packet_sink_close(struct sc_packet_sink *sink) {
struct sc_recorder *recorder = DOWNCAST_VIDEO(sink);
sc_mutex_lock(&recorder->mutex);
// EOS also stops the recorder
recorder->stopped = true;
sc_cond_signal(&recorder->queue_cond);
sc_mutex_unlock(&recorder->mutex);
}
static bool
sc_recorder_video_packet_sink_push(struct sc_packet_sink *sink,
const AVPacket *packet) {
struct sc_recorder *recorder = DOWNCAST_VIDEO(sink);
sc_mutex_lock(&recorder->mutex);
if (recorder->stopped) {
// reject any new packet
sc_mutex_unlock(&recorder->mutex);
return false;
}
struct sc_record_packet *rec = sc_record_packet_new(packet);
if (!rec) {
LOG_OOM();
sc_mutex_unlock(&recorder->mutex);
return false;
}
rec->packet->stream_index = recorder->video_stream_index;
sc_queue_push(&recorder->video_queue, next, rec);
sc_cond_signal(&recorder->queue_cond);
sc_mutex_unlock(&recorder->mutex);
return true;
}
static bool
sc_recorder_audio_packet_sink_open(struct sc_packet_sink *sink,
const AVCodec *codec) {
struct sc_recorder *recorder = DOWNCAST_AUDIO(sink);
assert(recorder->audio);
// only written from this thread, no need to lock
assert(!recorder->audio_disabled);
assert(codec);
sc_mutex_lock(&recorder->mutex);
recorder->audio_codec = codec;
sc_cond_signal(&recorder->stream_cond);
sc_mutex_unlock(&recorder->mutex);
return true;
}
static void
sc_recorder_audio_packet_sink_close(struct sc_packet_sink *sink) {
struct sc_recorder *recorder = DOWNCAST_AUDIO(sink);
assert(recorder->audio);
// only written from this thread, no need to lock
assert(!recorder->audio_disabled);
sc_mutex_lock(&recorder->mutex);
// EOS also stops the recorder
recorder->stopped = true;
sc_cond_signal(&recorder->queue_cond);
sc_mutex_unlock(&recorder->mutex);
}
static bool
sc_recorder_audio_packet_sink_push(struct sc_packet_sink *sink,
const AVPacket *packet) {
struct sc_recorder *recorder = DOWNCAST_AUDIO(sink);
assert(recorder->audio);
// only written from this thread, no need to lock
assert(!recorder->audio_disabled);
sc_mutex_lock(&recorder->mutex);
if (recorder->stopped) {
// reject any new packet
sc_mutex_unlock(&recorder->mutex);
return false;
}
struct sc_record_packet *rec = sc_record_packet_new(packet);
if (!rec) {
LOG_OOM();
sc_mutex_unlock(&recorder->mutex);
return false;
}
rec->packet->stream_index = recorder->audio_stream_index;
sc_queue_push(&recorder->audio_queue, next, rec);
sc_cond_signal(&recorder->queue_cond);
sc_mutex_unlock(&recorder->mutex);
return true;
}
static void
sc_recorder_audio_packet_sink_disable(struct sc_packet_sink *sink) {
struct sc_recorder *recorder = DOWNCAST_AUDIO(sink);
assert(recorder->audio);
// only written from this thread, no need to lock
assert(!recorder->audio_disabled);
assert(!recorder->audio_codec);
LOGW("Audio stream recording disabled");
sc_mutex_lock(&recorder->mutex);
recorder->audio_disabled = true;
sc_cond_signal(&recorder->stream_cond);
sc_mutex_unlock(&recorder->mutex);
}
bool
sc_recorder_init(struct sc_recorder *recorder, const char *filename,
enum sc_record_format format, bool audio,
struct sc_size declared_frame_size,
const struct sc_recorder_callbacks *cbs, void *cbs_userdata) {
recorder->filename = strdup(filename);
if (!recorder->filename) {
LOG_OOM();
return false;
}
bool ok = sc_mutex_init(&recorder->mutex);
if (!ok) {
goto error_free_filename;
}
ok = sc_cond_init(&recorder->queue_cond);
if (!ok) {
goto error_mutex_destroy;
}
ok = sc_cond_init(&recorder->stream_cond);
if (!ok) {
goto error_queue_cond_destroy;
}
recorder->audio = audio;
sc_queue_init(&recorder->video_queue);
sc_queue_init(&recorder->audio_queue);
recorder->stopped = false;
recorder->video_codec = NULL;
recorder->audio_codec = NULL;
recorder->audio_disabled = false;
recorder->video_stream_index = -1;
recorder->audio_stream_index = -1;
recorder->format = format;
recorder->declared_frame_size = declared_frame_size;
assert(cbs && cbs->on_ended);
recorder->cbs = cbs;
recorder->cbs_userdata = cbs_userdata;
static const struct sc_packet_sink_ops video_ops = {
.open = sc_recorder_video_packet_sink_open,
.close = sc_recorder_video_packet_sink_close,
.push = sc_recorder_video_packet_sink_push,
};
recorder->video_packet_sink.ops = &video_ops;
if (audio) {
static const struct sc_packet_sink_ops audio_ops = {
.open = sc_recorder_audio_packet_sink_open,
.close = sc_recorder_audio_packet_sink_close,
.push = sc_recorder_audio_packet_sink_push,
.disable = sc_recorder_audio_packet_sink_disable,
};
recorder->audio_packet_sink.ops = &audio_ops;
}
return true;
error_queue_cond_destroy:
sc_cond_destroy(&recorder->queue_cond);
error_mutex_destroy:
sc_mutex_destroy(&recorder->mutex);
error_free_filename:
free(recorder->filename);
return false;
}
bool
sc_recorder_start(struct sc_recorder *recorder) {
bool ok = sc_thread_create(&recorder->thread, run_recorder,
"scrcpy-recorder", recorder);
if (!ok) {
LOGE("Could not start recorder thread");
return false;
}
return true;
}
void
sc_recorder_stop(struct sc_recorder *recorder) {
sc_mutex_lock(&recorder->mutex);
recorder->stopped = true;
sc_cond_signal(&recorder->queue_cond);
sc_cond_signal(&recorder->stream_cond);
sc_mutex_unlock(&recorder->mutex);
}
void
sc_recorder_join(struct sc_recorder *recorder) {
sc_thread_join(&recorder->thread, NULL);
}
void
sc_recorder_destroy(struct sc_recorder *recorder) {
sc_cond_destroy(&recorder->stream_cond);
sc_cond_destroy(&recorder->queue_cond);
sc_mutex_destroy(&recorder->mutex);
free(recorder->filename);
}