X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/1153fd2325f924dcd8990b41ca67a4d683394e48..9086a105b77eabd940a54e9a394b2500d9495db2:/clients/playrtp.c diff --git a/clients/playrtp.c b/clients/playrtp.c index e259b2c..68926e6 100644 --- a/clients/playrtp.c +++ b/clients/playrtp.c @@ -60,7 +60,7 @@ static const char *device; */ #define MAXSAMPLES 2048 -/** @brief Minimum buffer size +/** @brief Minimum low watermark * * We'll stop playing if there's only this many samples in the buffer. */ static unsigned minbuffer = 2 * 44100 / 10; /* 0.2 seconds */ @@ -70,12 +70,18 @@ static unsigned minbuffer = 2 * 44100 / 10; /* 0.2 seconds */ * The maximum supported size (in bytes) of one sample. */ #define MAXSAMPLESIZE 2 -/** @brief Buffer size +/** @brief Buffer high watermark * * We'll only start playing when this many samples are available. */ -static unsigned readahead = 4 * 2 * 44100; /* 4 seconds */ +static unsigned readahead = 2 * 2 * 44100; -#define MAXBUFFER (3 * 88200) /* maximum buffer contents */ +/** @brief Maximum buffer size + * + * We'll stop reading from the network if we have this many samples. */ +static unsigned maxbuffer; + +/** @brief Number of samples to infill by in one go */ +#define INFILL_SAMPLES (44100 * 2) /* 1s */ /** @brief Received packet * @@ -86,9 +92,7 @@ struct packet { * or mis-ordered there may be gaps at any given moment. */ struct packet *next; /** @brief Number of samples in this packet */ - int nsamples; - /** @brief Number of samples used from this packet */ - int nused; + uint32_t nsamples; /** @brief Timestamp from RTP packet * * NB that "timestamps" are really sample counters.*/ @@ -107,7 +111,8 @@ static unsigned long nsamples; /** @brief Linked list of packets * - * In ascending order of timestamp. */ + * In ascending order of timestamp. Really this should be a heap for more + * efficient access. */ static struct packet *packets; /** @brief Timestamp of next packet to play. @@ -134,6 +139,7 @@ static const struct option options[] = { { "debug", no_argument, 0, 'd' }, { "device", required_argument, 0, 'D' }, { "min", required_argument, 0, 'm' }, + { "max", required_argument, 0, 'x' }, { "buffer", required_argument, 0, 'b' }, { 0, 0, 0, 0 } }; @@ -143,6 +149,30 @@ static inline int lt(uint32_t a, uint32_t b) { return (uint32_t)(a - b) & 0x80000000; } +/** @brief Return true iff a >= b in sequence-space arithmetic */ +static inline int ge(uint32_t a, uint32_t b) { + return !lt(a, b); +} + +/** @brief Return true iff a > b in sequence-space arithmetic */ +static inline int gt(uint32_t a, uint32_t b) { + return lt(b, a); +} + +/** @brief Return true iff a <= b in sequence-space arithmetic */ +static inline int le(uint32_t a, uint32_t b) { + return !lt(b, a); +} + +/** @brief Drop the packet at the head of the queue */ +static void drop_first_packet(void) { + struct packet *const p = packets; + packets = p->next; + nsamples -= p->nsamples; + free(p); + pthread_cond_broadcast(&cond); +} + /** @brief Background thread collecting samples * * This function collects samples, perhaps converts them to the target format, @@ -172,19 +202,25 @@ static void *listen_thread(void attribute((unused)) *arg) { /* Ignore too-short packets */ if((size_t)n <= sizeof (struct rtp_header)) continue; - p->nused = 0; p->timestamp = ntohl(packet.header.timestamp); /* Ignore packets in the past */ - if(active && lt(p->timestamp, next_timestamp)) + if(active && lt(p->timestamp, next_timestamp)) { + info("dropping old packet, timestamp=%"PRIx32" < %"PRIx32, + p->timestamp, next_timestamp); continue; + } /* Convert to target format */ switch(packet.header.mpt & 0x7F) { case 10: p->nsamples = (n - sizeof (struct rtp_header)) / sizeof(uint16_t); #if HAVE_COREAUDIO_AUDIOHARDWARE_H /* Convert to what Core Audio expects */ - for(n = 0; n < p->nsamples; ++n) - p->samples_float[n] = (int16_t)ntohs(samples[n]) * (0.5f / 32767); + { + size_t i; + + for(i = 0; i < p->nsamples; ++n) + p->samples_float[i] = (int16_t)ntohs(samples[i]) * (0.5f / 32767); + } #else /* ALSA can do any necessary conversion itself (though it might be better * to do any necessary conversion in the background) */ @@ -201,7 +237,7 @@ static void *listen_thread(void attribute((unused)) *arg) { * * This is rather unsatisfactory: it means that if packets get heavily * out of order then we guarantee dropouts. But for now... */ - while(nsamples >= MAXBUFFER) + while(nsamples >= maxbuffer) pthread_cond_wait(&cond, &lock); for(pp = &packets; *pp && lt((*pp)->timestamp, p->timestamp); @@ -211,7 +247,10 @@ static void *listen_thread(void attribute((unused)) *arg) { if(*pp && p->timestamp == (*pp)->timestamp) { /* *pp == p; a duplicate. Ideally we avoid the translation step here, * but we'll worry about that another time. */ + info("dropped a duplicated"); } else { + if(*pp) + info("receiving packets out of order"); p->next = *pp; *pp = p; nsamples += p->nsamples; @@ -224,48 +263,74 @@ static void *listen_thread(void attribute((unused)) *arg) { #if HAVE_COREAUDIO_AUDIOHARDWARE_H /** @brief Callback from Core Audio */ -static OSStatus adioproc(AudioDeviceID inDevice, - const AudioTimeStamp *inNow, - const AudioBufferList *inInputData, - const AudioTimeStamp *inInputTime, - AudioBufferList *outOutputData, - const AudioTimeStamp *inOutputTime, - void *inClientData) { +static OSStatus adioproc + (AudioDeviceID attribute((unused)) inDevice, + const AudioTimeStamp attribute((unused)) *inNow, + const AudioBufferList attribute((unused)) *inInputData, + const AudioTimeStamp attribute((unused)) *inInputTime, + AudioBufferList *outOutputData, + const AudioTimeStamp attribute((unused)) *inOutputTime, + void attribute((unused)) *inClientData) { UInt32 nbuffers = outOutputData->mNumberBuffers; AudioBuffer *ab = outOutputData->mBuffers; - float *samplesOut; /* where to write samples to */ - size_t samplesOutLeft; /* space left */ - size_t samplesInLeft; - size_t samplesToCopy; pthread_mutex_lock(&lock); - samplesOut = ab->data; - samplesOutLeft = ab->mDataByteSize / sizeof (float); - while(packets && nbuffers > 0) { - if(packets->used == packets->nsamples) { - /* TODO if we dropped a packet then we should introduce a gap here */ - struct packet *const p = packets; - packets = p->next; - free(p); - pthread_cond_broadcast(&cond); - continue; - } - if(samplesOutLeft == 0) { - --nbuffers; - ++ab; - samplesOut = ab->data; - samplesOutLeft = ab->mDataByteSize / sizeof (float); - continue; + while(nbuffers > 0) { + float *samplesOut = ab->mData; + size_t samplesOutLeft = ab->mDataByteSize / sizeof (float); + + while(samplesOutLeft > 0) { + if(packets) { + /* There's a packet */ + const uint32_t packet_start = packets->timestamp; + const uint32_t packet_end = packets->timestamp + packets->nsamples; + + if(le(packet_end, next_timestamp)) { + /* This packet is in the past */ + info("dropping buffered past packet %"PRIx32" < %"PRIx32, + packets->timestamp, next_timestamp); + continue; + } + if(ge(next_timestamp, packet_start) + && lt(next_timestamp, packet_end)) { + /* This packet is suitable */ + const uint32_t offset = next_timestamp - packets->timestamp; + uint32_t samples_available = packet_end - next_timestamp; + if(samples_available > samplesOutLeft) + samples_available = samplesOutLeft; + memcpy(samplesOut, + packets->samples_float + offset, + samples_available * sizeof(float)); + samplesOut += samples_available; + next_timestamp += samples_available; + if(ge(next_timestamp, packet_end)) + drop_first_packet(); + continue; + } + } + /* We didn't find a suitable packet (though there might still be + * unsuitable ones). We infill with 0s. */ + if(packets) { + /* There is a next packet, only infill up to that point */ + uint32_t samples_available = packets->timestamp - next_timestamp; + + if(samples_available > samplesOutLeft) + samples_available = samplesOutLeft; + /* Convniently the buffer is 0 to start with */ + next_timestamp += samples_available; + samplesOut += samples_available; + samplesOutLeft -= samples_available; + /* TODO log infill */ + } else { + /* There's no next packet at all */ + next_timestamp += samplesOutLeft; + samplesOut += samplesOutLeft; + samplesOutLeft = 0; + /* TODO log infill */ + } } - /* Now: (1) there is some data left to read - * (2) there is some space to put it */ - samplesInLeft = packets->nsamples - packets->used; - samplesToCopy = (samplesInLeft < samplesOutLeft - ? samplesInLeft : samplesOutLeft); - memcpy(samplesOut, packet->samples + packets->used, samplesToCopy); - packets->used += samplesToCopy; - samplesOut += samplesToCopy; - samesOutLeft -= samplesToCopy; + ++ab; + --nbuffers; } pthread_mutex_unlock(&lock); return 0; @@ -303,7 +368,9 @@ static void play_rtp(void) { size_t samples_written; int prepared = 1; int err; - int infilling = 0; + int infilling = 0, escape = 0; + time_t logged, now; + uint32_t packet_start, packet_end; /* Open ALSA */ if((err = snd_pcm_open(&pcm, @@ -347,9 +414,13 @@ static void play_rtp(void) { /* Ready to go */ + time(&logged); pthread_mutex_lock(&lock); for(;;) { /* Wait for the buffer to fill up a bit */ + logged = now; + info("%lu samples in buffer (%lus)", nsamples, + nsamples / (44100 * 2)); info("Buffering..."); while(nsamples < readahead) pthread_cond_wait(&cond, &lock); @@ -362,62 +433,116 @@ static void play_rtp(void) { next_timestamp = packets->timestamp; active = 1; infilling = 0; + escape = 0; + logged = now; + info("%lu samples in buffer (%lus)", nsamples, + nsamples / (44100 * 2)); info("Playing..."); /* Wait until the buffer empties out */ - while(nsamples >= minbuffer) { + while(nsamples >= minbuffer && !escape) { + time(&now); + if(now > logged + 10) { + logged = now; + info("%lu samples in buffer (%lus)", nsamples, + nsamples / (44100 * 2)); + } + if(packets + && ge(next_timestamp, packets->timestamp + packets->nsamples)) { + info("dropping buffered past packet %"PRIx32" < %"PRIx32, + packets->timestamp, next_timestamp); + drop_first_packet(); + continue; + } /* Wait for ALSA to ask us for more data */ pthread_mutex_unlock(&lock); - snd_pcm_wait(pcm, -1); + write(2, ".", 1); /* TODO remove me sometime */ + switch(err = snd_pcm_wait(pcm, -1)) { + case 0: + info("snd_pcm_wait timed out"); + break; + case 1: + break; + default: + fatal(0, "snd_pcm_wait returned %d", err); + } pthread_mutex_lock(&lock); /* ALSA is ready for more data */ - if(packets && packets->timestamp + packets->nused == next_timestamp) { - /* Hooray, we have a packet we can play */ - const size_t samples_available = packets->nsamples - packets->nused; + packet_start = packets->timestamp; + packet_end = packets->timestamp + packets->nsamples; + if(ge(next_timestamp, packet_start) + && lt(next_timestamp, packet_end)) { + /* The target timestamp is somewhere in this packet */ + const uint32_t offset = next_timestamp - packets->timestamp; + const uint32_t samples_available = (packets->timestamp + packets->nsamples) - next_timestamp; const size_t frames_available = samples_available / 2; frames_written = snd_pcm_writei(pcm, - packets->samples_raw + packets->nused, + packets->samples_raw + offset, frames_available); if(frames_written < 0) { - if(frames_written != -EAGAIN) + switch(frames_written) { + case -EAGAIN: + info("snd_pcm_wait() returned but we got -EAGAIN!"); + break; + case -EPIPE: + error(0, "error calling snd_pcm_writei: %ld", + (long)frames_written); + escape = 1; + break; + default: fatal(0, "error calling snd_pcm_writei: %ld", (long)frames_written); + } } else { samples_written = frames_written * 2; - packets->nused += samples_written; next_timestamp += samples_written; - if(packets->nused == packets->nsamples) { - /* We're done with this packet */ - struct packet *p = packets; - - packets = p->next; - nsamples -= p->nsamples; - free(p); - pthread_cond_broadcast(&cond); - } + if(ge(next_timestamp, packet_end)) + drop_first_packet(); infilling = 0; } } else { /* We don't have anything to play! We'd better play some 0s. */ - static const uint16_t zeros[1024]; - size_t samples_available = 1024, frames_available; + static const uint16_t zeros[INFILL_SAMPLES]; + size_t samples_available = INFILL_SAMPLES, frames_available; - if(!infilling) { - info("Infilling..."); - infilling = 1; - } - if(packets && next_timestamp + samples_available > packets->timestamp) + /* If the maximum infill would take us past the start of the next + * packet then we truncate the infill to the right amount. */ + if(lt(packets->timestamp, + next_timestamp + samples_available)) samples_available = packets->timestamp - next_timestamp; + if((int)samples_available < 0) { + info("packets->timestamp: %"PRIx32" next_timestamp: %"PRIx32" next+max: %"PRIx32" available: %"PRIx32, + packets->timestamp, next_timestamp, + next_timestamp + INFILL_SAMPLES, samples_available); + } frames_available = samples_available / 2; + if(!infilling) { + info("Infilling %d samples, next=%"PRIx32" packet=[%"PRIx32",%"PRIx32"]", + samples_available, next_timestamp, + packets->timestamp, packets->timestamp + packets->nsamples); + //infilling++; + } frames_written = snd_pcm_writei(pcm, zeros, frames_available); if(frames_written < 0) { - if(frames_written != -EAGAIN) + switch(frames_written) { + case -EAGAIN: + info("snd_pcm_wait() returned but we got -EAGAIN!"); + break; + case -EPIPE: + error(0, "error calling snd_pcm_writei: %ld", + (long)frames_written); + escape = 1; + break; + default: fatal(0, "error calling snd_pcm_writei: %ld", (long)frames_written); - } else + } + } else { + samples_written = frames_written * 2; next_timestamp += samples_written; + } } } active = 0; @@ -425,8 +550,13 @@ static void play_rtp(void) { pthread_mutex_unlock(&lock); if((err = snd_pcm_nonblock(pcm, 0))) fatal(0, "error calling snd_pcm_nonblock: %d", err); - if((err = snd_pcm_drain(pcm))) - fatal(0, "error calling snd_pcm_drain: %d", err); + if(escape) { + if((err = snd_pcm_drop(pcm))) + fatal(0, "error calling snd_pcm_drop: %d", err); + escape = 0; + } else + if((err = snd_pcm_drain(pcm))) + fatal(0, "error calling snd_pcm_drain: %d", err); if((err = snd_pcm_nonblock(pcm, 1))) fatal(0, "error calling snd_pcm_nonblock: %d", err); prepared = 0; @@ -459,14 +589,14 @@ static void play_rtp(void) { if(status) fatal(0, "AudioHardwareGetProperty: %d", (int)status); D(("mSampleRate %f", asbd.mSampleRate)); - D(("mFormatID %08"PRIx32, asbd.mFormatID)); - D(("mFormatFlags %08"PRIx32, asbd.mFormatFlags)); - D(("mBytesPerPacket %08"PRIx32, asbd.mBytesPerPacket)); - D(("mFramesPerPacket %08"PRIx32, asbd.mFramesPerPacket)); - D(("mBytesPerFrame %08"PRIx32, asbd.mBytesPerFrame)); - D(("mChannelsPerFrame %08"PRIx32, asbd.mChannelsPerFrame)); - D(("mBitsPerChannel %08"PRIx32, asbd.mBitsPerChannel)); - D(("mReserved %08"PRIx32, asbd.mReserved)); + D(("mFormatID %08lx", asbd.mFormatID)); + D(("mFormatFlags %08lx", asbd.mFormatFlags)); + D(("mBytesPerPacket %08lx", asbd.mBytesPerPacket)); + D(("mFramesPerPacket %08lx", asbd.mFramesPerPacket)); + D(("mBytesPerFrame %08lx", asbd.mBytesPerFrame)); + D(("mChannelsPerFrame %08lx", asbd.mChannelsPerFrame)); + D(("mBitsPerChannel %08lx", asbd.mBitsPerChannel)); + D(("mReserved %08lx", asbd.mReserved)); if(asbd.mFormatID != kAudioFormatLinearPCM) fatal(0, "audio device does not support kAudioFormatLinearPCM"); status = AudioDeviceAddIOProc(adid, adioproc, 0); @@ -501,12 +631,13 @@ static void help(void) { xprintf("Usage:\n" " disorder-playrtp [OPTIONS] ADDRESS [PORT]\n" "Options:\n" - " --help, -h Display usage message\n" - " --version, -V Display version number\n" - " --debug, -d Turn on debugging\n" " --device, -D DEVICE Output device\n" " --min, -m FRAMES Buffer low water mark\n" - " --buffer, -b FRAMES Buffer high water mark\n"); + " --buffer, -b FRAMES Buffer high water mark\n" + " --max, -x FRAMES Buffer maximum size\n" + " --help, -h Display usage message\n" + " --version, -V Display version number\n" + ); xfclose(stdout); exit(0); } @@ -537,7 +668,7 @@ int main(int argc, char **argv) { mem_init(); if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale"); - while((n = getopt_long(argc, argv, "hVdD:m:b:", options, 0)) >= 0) { + while((n = getopt_long(argc, argv, "hVdD:m:b:x:", options, 0)) >= 0) { switch(n) { case 'h': help(); case 'V': version(); @@ -545,9 +676,12 @@ int main(int argc, char **argv) { case 'D': device = optarg; break; case 'm': minbuffer = 2 * atol(optarg); break; case 'b': readahead = 2 * atol(optarg); break; + case 'x': maxbuffer = 2 * atol(optarg); break; default: fatal(0, "invalid option"); } } + if(!maxbuffer) + maxbuffer = 4 * readahead; argc -= optind; argv += optind; if(argc < 1 || argc > 2)