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Diffstat (limited to 'libspeex/jitter.c')
| -rw-r--r-- | libspeex/jitter.c | 843 |
1 files changed, 0 insertions, 843 deletions
diff --git a/libspeex/jitter.c b/libspeex/jitter.c deleted file mode 100644 index 68240f1..0000000 --- a/libspeex/jitter.c +++ /dev/null @@ -1,843 +0,0 @@ -/* Copyright (C) 2002 Jean-Marc Valin - File: speex_jitter.h - - Adaptive jitter buffer for Speex - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - - Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - - Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in the - documentation and/or other materials provided with the distribution. - - - Neither the name of the Xiph.org Foundation nor the names of its - contributors may be used to endorse or promote products derived from - this software without specific prior written permission. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR - CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -*/ - -/* -TODO: -- Add short-term estimate -- Defensive programming - + warn when last returned < last desired (begative buffering) - + warn if update_delay not called between get() and tick() or is called twice in a row -- Linked list structure for holding the packets instead of the current fixed-size array - + return memory to a pool - + allow pre-allocation of the pool - + optional max number of elements -- Statistics - + drift - + loss - + late - + jitter - + buffering delay -*/ -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - - -#include "arch.h" -#include "../include/speex/speex.h" -#include "../include/speex/speex_bits.h" -#include "../include/speex/speex_jitter.h" -#include "os_support.h" - -#ifndef NULL -#define NULL 0 -#endif - -#define SPEEX_JITTER_MAX_BUFFER_SIZE 200 /**< Maximum number of packets in jitter buffer */ - -#define TSUB(a,b) ((spx_int32_t)((a)-(b))) - -#define GT32(a,b) (((spx_int32_t)((a)-(b)))>0) -#define GE32(a,b) (((spx_int32_t)((a)-(b)))>=0) -#define LT32(a,b) (((spx_int32_t)((a)-(b)))<0) -#define LE32(a,b) (((spx_int32_t)((a)-(b)))<=0) - -#define ROUND_DOWN(x, step) ((x)<0 ? ((x)-(step)+1)/(step)*(step) : (x)/(step)*(step)) - -#define MAX_TIMINGS 40 -#define MAX_BUFFERS 3 -#define TOP_DELAY 40 - -/** Buffer that keeps the time of arrival of the latest packets */ -struct TimingBuffer { - int filled; /**< Number of entries occupied in "timing" and "counts"*/ - int curr_count; /**< Number of packet timings we got (including those we discarded) */ - spx_int32_t timing[MAX_TIMINGS]; /**< Sorted list of all timings ("latest" packets first) */ - spx_int16_t counts[MAX_TIMINGS]; /**< Order the packets were put in (will be used for short-term estimate) */ -}; - -static void tb_init(struct TimingBuffer *tb) -{ - tb->filled = 0; - tb->curr_count = 0; -} - -/* Add the timing of a new packet to the TimingBuffer */ -static void tb_add(struct TimingBuffer *tb, spx_int16_t timing) -{ - int pos; - /* Discard packet that won't make it into the list because they're too early */ - if (tb->filled >= MAX_TIMINGS && timing >= tb->timing[tb->filled-1]) - { - tb->curr_count++; - return; - } - - /* Find where the timing info goes in the sorted list */ - pos = 0; - /* FIXME: Do bisection instead of linear search */ - while (pos<tb->filled && timing >= tb->timing[pos]) - { - pos++; - } - - speex_assert(pos <= tb->filled && pos < MAX_TIMINGS); - - /* Shift everything so we can perform the insertion */ - if (pos < tb->filled) - { - int move_size = tb->filled-pos; - if (tb->filled == MAX_TIMINGS) - move_size -= 1; - SPEEX_MOVE(&tb->timing[pos+1], &tb->timing[pos], move_size); - SPEEX_MOVE(&tb->counts[pos+1], &tb->counts[pos], move_size); - } - /* Insert */ - tb->timing[pos] = timing; - tb->counts[pos] = tb->curr_count; - - tb->curr_count++; - if (tb->filled<MAX_TIMINGS) - tb->filled++; -} - - - -/** Jitter buffer structure */ -struct JitterBuffer_ { - spx_uint32_t pointer_timestamp; /**< Timestamp of what we will *get* next */ - spx_uint32_t last_returned_timestamp; /**< Useful for getting the next packet with the same timestamp (for fragmented media) */ - spx_uint32_t next_stop; /**< Estimated time the next get() will be called */ - - spx_int32_t buffered; /**< Amount of data we think is still buffered by the application (timestamp units)*/ - - JitterBufferPacket packets[SPEEX_JITTER_MAX_BUFFER_SIZE]; /**< Packets stored in the buffer */ - spx_uint32_t arrival[SPEEX_JITTER_MAX_BUFFER_SIZE]; /**< Packet arrival time (0 means it was late, even though it's a valid timestamp) */ - - void (*destroy) (void *); /**< Callback for destroying a packet */ - - spx_int32_t delay_step; /**< Size of the steps when adjusting buffering (timestamp units) */ - spx_int32_t concealment_size; /**< Size of the packet loss concealment "units" */ - int reset_state; /**< True if state was just reset */ - int buffer_margin; /**< How many frames we want to keep in the buffer (lower bound) */ - int late_cutoff; /**< How late must a packet be for it not to be considered at all */ - int interp_requested; /**< An interpolation is requested by speex_jitter_update_delay() */ - int auto_adjust; /**< Whether to automatically adjust the delay at any time */ - - struct TimingBuffer _tb[MAX_BUFFERS]; /**< Don't use those directly */ - struct TimingBuffer *timeBuffers[MAX_BUFFERS]; /**< Storing arrival time of latest frames so we can compute some stats */ - int window_size; /**< Total window over which the late frames are counted */ - int subwindow_size; /**< Sub-window size for faster computation */ - int max_late_rate; /**< Absolute maximum amount of late packets tolerable (in percent) */ - int latency_tradeoff; /**< Latency equivalent of losing one percent of packets */ - int auto_tradeoff; /**< Latency equivalent of losing one percent of packets (automatic default) */ - - int lost_count; /**< Number of consecutive lost packets */ -}; - -/** Based on available data, this computes the optimal delay for the jitter buffer. - The optimised function is in timestamp units and is: - cost = delay + late_factor*[number of frames that would be late if we used that delay] - @param tb Array of buffers - @param late_factor Equivalent cost of a late frame (in timestamp units) - */ -static spx_int16_t compute_opt_delay(JitterBuffer *jitter) -{ - int i; - spx_int16_t opt=0; - spx_int32_t best_cost=0x7fffffff; - int late = 0; - int pos[MAX_BUFFERS]; - int tot_count; - float late_factor; - int penalty_taken = 0; - int best = 0; - int worst = 0; - spx_int32_t deltaT; - struct TimingBuffer *tb; - - tb = jitter->_tb; - - /* Number of packet timings we have received (including those we didn't keep) */ - tot_count = 0; - for (i=0;i<MAX_BUFFERS;i++) - tot_count += tb[i].curr_count; - if (tot_count==0) - return 0; - - /* Compute cost for one lost packet */ - if (jitter->latency_tradeoff != 0) - late_factor = jitter->latency_tradeoff * 100.0f / tot_count; - else - late_factor = jitter->auto_tradeoff * jitter->window_size/tot_count; - - /*fprintf(stderr, "late_factor = %f\n", late_factor);*/ - for (i=0;i<MAX_BUFFERS;i++) - pos[i] = 0; - - /* Pick the TOP_DELAY "latest" packets (doesn't need to actually be late - for the current settings) */ - for (i=0;i<TOP_DELAY;i++) - { - int j; - int next=-1; - int latest = 32767; - /* Pick latest amoung all sub-windows */ - for (j=0;j<MAX_BUFFERS;j++) - { - if (pos[j] < tb[j].filled && tb[j].timing[pos[j]] < latest) - { - next = j; - latest = tb[j].timing[pos[j]]; - } - } - if (next != -1) - { - spx_int32_t cost; - - if (i==0) - worst = latest; - best = latest; - latest = ROUND_DOWN(latest, jitter->delay_step); - pos[next]++; - - /* Actual cost function that tells us how bad using this delay would be */ - cost = -latest + late_factor*late; - /*fprintf(stderr, "cost %d = %d + %f * %d\n", cost, -latest, late_factor, late);*/ - if (cost < best_cost) - { - best_cost = cost; - opt = latest; - } - } else { - break; - } - - /* For the next timing we will consider, there will be one more late packet to count */ - late++; - /* Two-frame penalty if we're going to increase the amount of late frames (hysteresis) */ - if (latest >= 0 && !penalty_taken) - { - penalty_taken = 1; - late+=4; - } - } - - deltaT = best-worst; - /* This is a default "automatic latency tradeoff" when none is provided */ - jitter->auto_tradeoff = 1 + deltaT/TOP_DELAY; - /*fprintf(stderr, "auto_tradeoff = %d (%d %d %d)\n", jitter->auto_tradeoff, best, worst, i);*/ - - /* FIXME: Compute a short-term estimate too and combine with the long-term one */ - - /* Prevents reducing the buffer size when we haven't really had much data */ - if (tot_count < TOP_DELAY && opt > 0) - return 0; - return opt; -} - - -/** Initialise jitter buffer */ -EXPORT JitterBuffer *jitter_buffer_init(int step_size) -{ - JitterBuffer *jitter = (JitterBuffer*)speex_alloc(sizeof(JitterBuffer)); - if (jitter) - { - int i; - spx_int32_t tmp; - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - jitter->packets[i].data=NULL; - jitter->delay_step = step_size; - jitter->concealment_size = step_size; - /*FIXME: Should this be 0 or 1?*/ - jitter->buffer_margin = 0; - jitter->late_cutoff = 50; - jitter->destroy = NULL; - jitter->latency_tradeoff = 0; - jitter->auto_adjust = 1; - tmp = 4; - jitter_buffer_ctl(jitter, JITTER_BUFFER_SET_MAX_LATE_RATE, &tmp); - jitter_buffer_reset(jitter); - } - return jitter; -} - -/** Reset jitter buffer */ -EXPORT void jitter_buffer_reset(JitterBuffer *jitter) -{ - int i; - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - { - if (jitter->packets[i].data) - { - if (jitter->destroy) - jitter->destroy(jitter->packets[i].data); - else - speex_free(jitter->packets[i].data); - jitter->packets[i].data = NULL; - } - } - /* Timestamp is actually undefined at this point */ - jitter->pointer_timestamp = 0; - jitter->next_stop = 0; - jitter->reset_state = 1; - jitter->lost_count = 0; - jitter->buffered = 0; - jitter->auto_tradeoff = 32000; - - for (i=0;i<MAX_BUFFERS;i++) - { - tb_init(&jitter->_tb[i]); - jitter->timeBuffers[i] = &jitter->_tb[i]; - } - /*fprintf (stderr, "reset\n");*/ -} - -/** Destroy jitter buffer */ -EXPORT void jitter_buffer_destroy(JitterBuffer *jitter) -{ - jitter_buffer_reset(jitter); - speex_free(jitter); -} - -/** Take the following timing into consideration for future calculations */ -static void update_timings(JitterBuffer *jitter, spx_int32_t timing) -{ - if (timing < -32767) - timing = -32767; - if (timing > 32767) - timing = 32767; - /* If the current sub-window is full, perform a rotation and discard oldest sub-widow */ - if (jitter->timeBuffers[0]->curr_count >= jitter->subwindow_size) - { - int i; - /*fprintf(stderr, "Rotate buffer\n");*/ - struct TimingBuffer *tmp = jitter->timeBuffers[MAX_BUFFERS-1]; - for (i=MAX_BUFFERS-1;i>=1;i--) - jitter->timeBuffers[i] = jitter->timeBuffers[i-1]; - jitter->timeBuffers[0] = tmp; - tb_init(jitter->timeBuffers[0]); - } - tb_add(jitter->timeBuffers[0], timing); -} - -/** Compensate all timings when we do an adjustment of the buffering */ -static void shift_timings(JitterBuffer *jitter, spx_int16_t amount) -{ - int i, j; - for (i=0;i<MAX_BUFFERS;i++) - { - for (j=0;j<jitter->timeBuffers[i]->filled;j++) - jitter->timeBuffers[i]->timing[j] += amount; - } -} - - -/** Put one packet into the jitter buffer */ -EXPORT void jitter_buffer_put(JitterBuffer *jitter, const JitterBufferPacket *packet) -{ - int i,j; - int late; - /*fprintf (stderr, "put packet %d %d\n", timestamp, span);*/ - - /* Cleanup buffer (remove old packets that weren't played) */ - if (!jitter->reset_state) - { - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - { - /* Make sure we don't discard a "just-late" packet in case we want to play it next (if we interpolate). */ - if (jitter->packets[i].data && LE32(jitter->packets[i].timestamp + jitter->packets[i].span, jitter->pointer_timestamp)) - { - /*fprintf (stderr, "cleaned (not played)\n");*/ - if (jitter->destroy) - jitter->destroy(jitter->packets[i].data); - else - speex_free(jitter->packets[i].data); - jitter->packets[i].data = NULL; - } - } - } - - /*fprintf(stderr, "arrival: %d %d %d\n", packet->timestamp, jitter->next_stop, jitter->pointer_timestamp);*/ - /* Check if packet is late (could still be useful though) */ - if (!jitter->reset_state && LT32(packet->timestamp, jitter->next_stop)) - { - update_timings(jitter, ((spx_int32_t)packet->timestamp) - ((spx_int32_t)jitter->next_stop) - jitter->buffer_margin); - late = 1; - } else { - late = 0; - } - - /* For some reason, the consumer has failed the last 20 fetches. Make sure this packet is - * used to resync. */ - if (jitter->lost_count>20) - { - jitter_buffer_reset(jitter); - } - - /* Only insert the packet if it's not hopelessly late (i.e. totally useless) */ - if (jitter->reset_state || GE32(packet->timestamp+packet->span+jitter->delay_step, jitter->pointer_timestamp)) - { - - /*Find an empty slot in the buffer*/ - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - { - if (jitter->packets[i].data==NULL) - break; - } - - /*No place left in the buffer, need to make room for it by discarding the oldest packet */ - if (i==SPEEX_JITTER_MAX_BUFFER_SIZE) - { - int earliest=jitter->packets[0].timestamp; - i=0; - for (j=1;j<SPEEX_JITTER_MAX_BUFFER_SIZE;j++) - { - if (!jitter->packets[i].data || LT32(jitter->packets[j].timestamp,earliest)) - { - earliest = jitter->packets[j].timestamp; - i=j; - } - } - if (jitter->destroy) - jitter->destroy(jitter->packets[i].data); - else - speex_free(jitter->packets[i].data); - jitter->packets[i].data=NULL; - /*fprintf (stderr, "Buffer is full, discarding earliest frame %d (currently at %d)\n", timestamp, jitter->pointer_timestamp);*/ - } - - /* Copy packet in buffer */ - if (jitter->destroy) - { - jitter->packets[i].data = packet->data; - } else { - jitter->packets[i].data=(char*)speex_alloc(packet->len); - for (j=0;j<packet->len;j++) - jitter->packets[i].data[j]=packet->data[j]; - } - jitter->packets[i].timestamp=packet->timestamp; - jitter->packets[i].span=packet->span; - jitter->packets[i].len=packet->len; - jitter->packets[i].sequence=packet->sequence; - jitter->packets[i].user_data=packet->user_data; - if (jitter->reset_state || late) - jitter->arrival[i] = 0; - else - jitter->arrival[i] = jitter->next_stop; - } - - -} - -/** Get one packet from the jitter buffer */ -EXPORT int jitter_buffer_get(JitterBuffer *jitter, JitterBufferPacket *packet, spx_int32_t desired_span, spx_int32_t *start_offset) -{ - int i; - unsigned int j; - int incomplete = 0; - spx_int16_t opt; - - if (start_offset != NULL) - *start_offset = 0; - - /* Syncing on the first call */ - if (jitter->reset_state) - { - int found = 0; - /* Find the oldest packet */ - spx_uint32_t oldest=0; - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - { - if (jitter->packets[i].data && (!found || LT32(jitter->packets[i].timestamp,oldest))) - { - oldest = jitter->packets[i].timestamp; - found = 1; - } - } - if (found) - { - jitter->reset_state=0; - jitter->pointer_timestamp = oldest; - jitter->next_stop = oldest; - } else { - packet->timestamp = 0; - packet->span = jitter->interp_requested; - return JITTER_BUFFER_MISSING; - } - } - - - jitter->last_returned_timestamp = jitter->pointer_timestamp; - - if (jitter->interp_requested != 0) - { - packet->timestamp = jitter->pointer_timestamp; - packet->span = jitter->interp_requested; - - /* Increment the pointer because it got decremented in the delay update */ - jitter->pointer_timestamp += jitter->interp_requested; - packet->len = 0; - /*fprintf (stderr, "Deferred interpolate\n");*/ - - jitter->interp_requested = 0; - - jitter->buffered = packet->span - desired_span; - - return JITTER_BUFFER_INSERTION; - } - - /* Searching for the packet that fits best */ - - /* Search the buffer for a packet with the right timestamp and spanning the whole current chunk */ - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - { - if (jitter->packets[i].data && jitter->packets[i].timestamp==jitter->pointer_timestamp && GE32(jitter->packets[i].timestamp+jitter->packets[i].span,jitter->pointer_timestamp+desired_span)) - break; - } - - /* If no match, try for an "older" packet that still spans (fully) the current chunk */ - if (i==SPEEX_JITTER_MAX_BUFFER_SIZE) - { - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - { - if (jitter->packets[i].data && LE32(jitter->packets[i].timestamp, jitter->pointer_timestamp) && GE32(jitter->packets[i].timestamp+jitter->packets[i].span,jitter->pointer_timestamp+desired_span)) - break; - } - } - - /* If still no match, try for an "older" packet that spans part of the current chunk */ - if (i==SPEEX_JITTER_MAX_BUFFER_SIZE) - { - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - { - if (jitter->packets[i].data && LE32(jitter->packets[i].timestamp, jitter->pointer_timestamp) && GT32(jitter->packets[i].timestamp+jitter->packets[i].span,jitter->pointer_timestamp)) - break; - } - } - - /* If still no match, try for earliest packet possible */ - if (i==SPEEX_JITTER_MAX_BUFFER_SIZE) - { - int found = 0; - spx_uint32_t best_time=0; - int best_span=0; - int besti=0; - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - { - /* check if packet starts within current chunk */ - if (jitter->packets[i].data && LT32(jitter->packets[i].timestamp,jitter->pointer_timestamp+desired_span) && GE32(jitter->packets[i].timestamp,jitter->pointer_timestamp)) - { - if (!found || LT32(jitter->packets[i].timestamp,best_time) || (jitter->packets[i].timestamp==best_time && GT32(jitter->packets[i].span,best_span))) - { - best_time = jitter->packets[i].timestamp; - best_span = jitter->packets[i].span; - besti = i; - found = 1; - } - } - } - if (found) - { - i=besti; - incomplete = 1; - /*fprintf (stderr, "incomplete: %d %d %d %d\n", jitter->packets[i].timestamp, jitter->pointer_timestamp, chunk_size, jitter->packets[i].span);*/ - } - } - - /* If we find something */ - if (i!=SPEEX_JITTER_MAX_BUFFER_SIZE) - { - spx_int32_t offset; - - /* We (obviously) haven't lost this packet */ - jitter->lost_count = 0; - - /* In this case, 0 isn't as a valid timestamp */ - if (jitter->arrival[i] != 0) - { - update_timings(jitter, ((spx_int32_t)jitter->packets[i].timestamp) - ((spx_int32_t)jitter->arrival[i]) - jitter->buffer_margin); - } - - - /* Copy packet */ - if (jitter->destroy) - { - packet->data = jitter->packets[i].data; - packet->len = jitter->packets[i].len; - } else { - if (jitter->packets[i].len > packet->len) - { - speex_warning_int("jitter_buffer_get(): packet too large to fit. Size is", jitter->packets[i].len); - } else { - packet->len = jitter->packets[i].len; - } - for (j=0;j<packet->len;j++) - packet->data[j] = jitter->packets[i].data[j]; - /* Remove packet */ - speex_free(jitter->packets[i].data); - } - jitter->packets[i].data = NULL; - /* Set timestamp and span (if requested) */ - offset = (spx_int32_t)jitter->packets[i].timestamp-(spx_int32_t)jitter->pointer_timestamp; - if (start_offset != NULL) - *start_offset = offset; - else if (offset != 0) - speex_warning_int("jitter_buffer_get() discarding non-zero start_offset", offset); - - packet->timestamp = jitter->packets[i].timestamp; - jitter->last_returned_timestamp = packet->timestamp; - - packet->span = jitter->packets[i].span; - packet->sequence = jitter->packets[i].sequence; - packet->user_data = jitter->packets[i].user_data; - /* Point to the end of the current packet */ - jitter->pointer_timestamp = jitter->packets[i].timestamp+jitter->packets[i].span; - - jitter->buffered = packet->span - desired_span; - - if (start_offset != NULL) - jitter->buffered += *start_offset; - - return JITTER_BUFFER_OK; - } - - - /* If we haven't found anything worth returning */ - - /*fprintf (stderr, "not found\n");*/ - jitter->lost_count++; - /*fprintf (stderr, "m");*/ - /*fprintf (stderr, "lost_count = %d\n", jitter->lost_count);*/ - - opt = compute_opt_delay(jitter); - - /* Should we force an increase in the buffer or just do normal interpolation? */ - if (opt < 0) - { - /* Need to increase buffering */ - - /* Shift histogram to compensate */ - shift_timings(jitter, -opt); - - packet->timestamp = jitter->pointer_timestamp; - packet->span = -opt; - /* Don't move the pointer_timestamp forward */ - packet->len = 0; - - jitter->buffered = packet->span - desired_span; - return JITTER_BUFFER_INSERTION; - /*jitter->pointer_timestamp -= jitter->delay_step;*/ - /*fprintf (stderr, "Forced to interpolate\n");*/ - } else { - /* Normal packet loss */ - packet->timestamp = jitter->pointer_timestamp; - - desired_span = ROUND_DOWN(desired_span, jitter->concealment_size); - packet->span = desired_span; - jitter->pointer_timestamp += desired_span; - packet->len = 0; - - jitter->buffered = packet->span - desired_span; - return JITTER_BUFFER_MISSING; - /*fprintf (stderr, "Normal loss\n");*/ - } - - -} - -EXPORT int jitter_buffer_get_another(JitterBuffer *jitter, JitterBufferPacket *packet) -{ - int i, j; - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - { - if (jitter->packets[i].data && jitter->packets[i].timestamp==jitter->last_returned_timestamp) - break; - } - if (i!=SPEEX_JITTER_MAX_BUFFER_SIZE) - { - /* Copy packet */ - packet->len = jitter->packets[i].len; - if (jitter->destroy) - { - packet->data = jitter->packets[i].data; - } else { - for (j=0;j<packet->len;j++) - packet->data[j] = jitter->packets[i].data[j]; - /* Remove packet */ - speex_free(jitter->packets[i].data); - } - jitter->packets[i].data = NULL; - packet->timestamp = jitter->packets[i].timestamp; - packet->span = jitter->packets[i].span; - packet->sequence = jitter->packets[i].sequence; - packet->user_data = jitter->packets[i].user_data; - return JITTER_BUFFER_OK; - } else { - packet->data = NULL; - packet->len = 0; - packet->span = 0; - return JITTER_BUFFER_MISSING; - } -} - -/* Let the jitter buffer know it's the right time to adjust the buffering delay to the network conditions */ -static int _jitter_buffer_update_delay(JitterBuffer *jitter, JitterBufferPacket *packet, spx_int32_t *start_offset) -{ - spx_int16_t opt = compute_opt_delay(jitter); - /*fprintf(stderr, "opt adjustment is %d ", opt);*/ - - if (opt < 0) - { - shift_timings(jitter, -opt); - - jitter->pointer_timestamp += opt; - jitter->interp_requested = -opt; - /*fprintf (stderr, "Decision to interpolate %d samples\n", -opt);*/ - } else if (opt > 0) - { - shift_timings(jitter, -opt); - jitter->pointer_timestamp += opt; - /*fprintf (stderr, "Decision to drop %d samples\n", opt);*/ - } - - return opt; -} - -/* Let the jitter buffer know it's the right time to adjust the buffering delay to the network conditions */ -EXPORT int jitter_buffer_update_delay(JitterBuffer *jitter, JitterBufferPacket *packet, spx_int32_t *start_offset) -{ - /* If the programmer calls jitter_buffer_update_delay() directly, - automatically disable auto-adjustment */ - jitter->auto_adjust = 0; - - return _jitter_buffer_update_delay(jitter, packet, start_offset); -} - -/** Get pointer timestamp of jitter buffer */ -EXPORT int jitter_buffer_get_pointer_timestamp(JitterBuffer *jitter) -{ - return jitter->pointer_timestamp; -} - -EXPORT void jitter_buffer_tick(JitterBuffer *jitter) -{ - /* Automatically-adjust the buffering delay if requested */ - if (jitter->auto_adjust) - _jitter_buffer_update_delay(jitter, NULL, NULL); - - if (jitter->buffered >= 0) - { - jitter->next_stop = jitter->pointer_timestamp - jitter->buffered; - } else { - jitter->next_stop = jitter->pointer_timestamp; - speex_warning_int("jitter buffer sees negative buffering, your code might be broken. Value is ", jitter->buffered); - } - jitter->buffered = 0; -} - -EXPORT void jitter_buffer_remaining_span(JitterBuffer *jitter, spx_uint32_t rem) -{ - /* Automatically-adjust the buffering delay if requested */ - if (jitter->auto_adjust) - _jitter_buffer_update_delay(jitter, NULL, NULL); - - if (jitter->buffered < 0) - speex_warning_int("jitter buffer sees negative buffering, your code might be broken. Value is ", jitter->buffered); - jitter->next_stop = jitter->pointer_timestamp - rem; -} - - -/* Used like the ioctl function to control the jitter buffer parameters */ -EXPORT int jitter_buffer_ctl(JitterBuffer *jitter, int request, void *ptr) -{ - int count, i; - switch(request) - { - case JITTER_BUFFER_SET_MARGIN: - jitter->buffer_margin = *(spx_int32_t*)ptr; - break; - case JITTER_BUFFER_GET_MARGIN: - *(spx_int32_t*)ptr = jitter->buffer_margin; - break; - case JITTER_BUFFER_GET_AVALIABLE_COUNT: - count = 0; - for (i=0;i<SPEEX_JITTER_MAX_BUFFER_SIZE;i++) - { - if (jitter->packets[i].data && LE32(jitter->pointer_timestamp, jitter->packets[i].timestamp)) - { - count++; - } - } - *(spx_int32_t*)ptr = count; - break; - case JITTER_BUFFER_SET_DESTROY_CALLBACK: - jitter->destroy = (void (*) (void *))ptr; - break; - case JITTER_BUFFER_GET_DESTROY_CALLBACK: - *(void (**) (void *))ptr = jitter->destroy; - break; - case JITTER_BUFFER_SET_DELAY_STEP: - jitter->delay_step = *(spx_int32_t*)ptr; - break; - case JITTER_BUFFER_GET_DELAY_STEP: - *(spx_int32_t*)ptr = jitter->delay_step; - break; - case JITTER_BUFFER_SET_CONCEALMENT_SIZE: - jitter->concealment_size = *(spx_int32_t*)ptr; - break; - case JITTER_BUFFER_GET_CONCEALMENT_SIZE: - *(spx_int32_t*)ptr = jitter->concealment_size; - break; - case JITTER_BUFFER_SET_MAX_LATE_RATE: - jitter->max_late_rate = *(spx_int32_t*)ptr; - jitter->window_size = 100*TOP_DELAY/jitter->max_late_rate; - jitter->subwindow_size = jitter->window_size/MAX_BUFFERS; - break; - case JITTER_BUFFER_GET_MAX_LATE_RATE: - *(spx_int32_t*)ptr = jitter->max_late_rate; - break; - case JITTER_BUFFER_SET_LATE_COST: - jitter->latency_tradeoff = *(spx_int32_t*)ptr; - break; - case JITTER_BUFFER_GET_LATE_COST: - *(spx_int32_t*)ptr = jitter->latency_tradeoff; - break; - default: - speex_warning_int("Unknown jitter_buffer_ctl request: ", request); - return -1; - } - return 0; -} - |