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faac: rewrite data caching and timestamp handling

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Also fixes #593348.
This commit is contained in:
Mark Nauwelaerts 2009-08-30 23:00:35 +02:00
parent 6a7b02e480
commit f81b1e7a4a
2 changed files with 149 additions and 173 deletions
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312
ext/faac/gstfaac.c
View file

@ -1,5 +1,6 @@
/* GStreamer FAAC (Free AAC Encoder) plugin
* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
* Copyright (C) 2009 Mark Nauwelaerts <mnauw@users.sourceforge.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@ -82,6 +83,7 @@ enum
static void gst_faac_base_init (GstFaacClass * klass);
static void gst_faac_class_init (GstFaacClass * klass);
static void gst_faac_init (GstFaac * faac);
static void gst_faac_finalize (GObject * object);
static void gst_faac_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
@ -222,6 +224,7 @@ gst_faac_class_init (GstFaacClass * klass)
gobject_class->set_property = gst_faac_set_property;
gobject_class->get_property = gst_faac_get_property;
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_faac_finalize);
/* properties */
g_object_class_install_property (gobject_class, ARG_BITRATE,
@ -255,10 +258,7 @@ gst_faac_init (GstFaac * faac)
faac->handle = NULL;
faac->samplerate = -1;
faac->channels = -1;
faac->cache = NULL;
faac->cache_time = GST_CLOCK_TIME_NONE;
faac->cache_duration = 0;
faac->next_ts = GST_CLOCK_TIME_NONE;
faac->offset = 0;
faac->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (faac->sinkpad,
@ -273,6 +273,8 @@ gst_faac_init (GstFaac * faac)
gst_pad_use_fixed_caps (faac->srcpad);
gst_element_add_pad (GST_ELEMENT (faac), faac->srcpad);
faac->adapter = gst_adapter_new ();
/* default properties */
faac->bitrate = 1000 * 128;
faac->profile = MAIN;
@ -282,6 +284,16 @@ gst_faac_init (GstFaac * faac)
faac->midside = TRUE;
}
static void
gst_faac_finalize (GObject * object)
{
GstFaac *faac = (GstFaac *) object;
g_object_unref (faac->adapter);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_faac_sink_setcaps (GstPad * pad, GstCaps * caps)
{
@ -300,10 +312,8 @@ gst_faac_sink_setcaps (GstPad * pad, GstCaps * caps)
faacEncClose (faac->handle);
faac->handle = NULL;
}
if (faac->cache) {
gst_buffer_unref (faac->cache);
faac->cache = NULL;
}
gst_adapter_clear (faac->adapter);
faac->offset = 0;
GST_OBJECT_UNLOCK (faac);
if (!gst_structure_get_int (structure, "channels", &channels) ||
@ -464,6 +474,119 @@ set_failed:
}
}
static GstFlowReturn
gst_faac_push_buffers (GstFaac * faac, gboolean force)
{
GstFlowReturn ret = GST_FLOW_OK;
gint av, frame_size, size, ret_size;
GstBuffer *outbuf;
guint64 timestamp, distance;
const guint8 *data;
/* samples already considers channel count */
frame_size = faac->samples * faac->bps;
while (ret == GST_FLOW_OK) {
av = gst_adapter_available (faac->adapter);
GST_LOG_OBJECT (faac, "pushing: force: %d, frame_size: %d, av: %d, "
"offset: %d", force, frame_size, av, faac->offset);
/* idea:
* - start of adapter corresponds with what has already been encoded
* (i.e. really returned by faac)
* - start + offset is what needs to be fed to faac next
* That way we can timestamp the output based
* on adapter provided timestamp (and duration is a fixed frame duration) */
/* not enough data for one frame and no flush forcing */
if (!force && (av < frame_size + faac->offset))
break;
if (G_LIKELY (av - faac->offset >= frame_size)) {
GST_LOG_OBJECT (faac, "encoding a frame");
data = gst_adapter_peek (faac->adapter, faac->offset + frame_size);
data += faac->offset;
size = frame_size;
} else if (av - faac->offset > 0) {
GST_LOG_OBJECT (faac, "encoding leftover");
data = gst_adapter_peek (faac->adapter, av);
data += faac->offset;
size = av - faac->offset;
} else {
GST_LOG_OBJECT (faac, "emptying encoder");
data = NULL;
size = 0;
}
outbuf = gst_buffer_new_and_alloc (faac->bytes);
if ((ret_size = faacEncEncode (faac->handle, (gint32 *) data,
size / faac->bps, GST_BUFFER_DATA (outbuf), faac->bytes)) < 0) {
gst_buffer_unref (outbuf);
goto encode_failed;
}
GST_LOG_OBJECT (faac, "encoder return: %d", ret_size);
/* consumed, advanced view */
faac->offset += size;
g_assert (faac->offset <= av);
if (!ret_size) {
gst_buffer_unref (outbuf);
if (size)
continue;
else
break;
}
/* after some caching, finally some data */
/* adapter gives time */
timestamp = gst_adapter_prev_timestamp (faac->adapter, &distance);
if ((av = gst_adapter_available (faac->adapter)) >= frame_size) {
/* must have then come from a complete frame */
gst_adapter_flush (faac->adapter, frame_size);
faac->offset -= frame_size;
size = frame_size;
} else {
/* otherwise leftover */
gst_adapter_clear (faac->adapter);
faac->offset = 0;
size = av;
}
GST_BUFFER_SIZE (outbuf) = ret_size;
if (GST_CLOCK_TIME_IS_VALID (timestamp))
GST_BUFFER_TIMESTAMP (outbuf) = timestamp +
GST_FRAMES_TO_CLOCK_TIME (distance / faac->channels / faac->bps,
faac->samplerate);
GST_BUFFER_DURATION (outbuf) =
GST_FRAMES_TO_CLOCK_TIME (size / faac->channels / faac->bps,
faac->samplerate);
/* perhaps check/set DISCONT based on timestamps ? */
GST_LOG_OBJECT (faac, "Pushing out buffer time: %" GST_TIME_FORMAT
" duration: %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)));
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (faac->srcpad));
ret = gst_pad_push (faac->srcpad, outbuf);
}
return ret;
/* ERRORS */
encode_failed:
{
GST_ELEMENT_ERROR (faac, LIBRARY, ENCODE, (NULL), (NULL));
gst_buffer_unref (outbuf);
return GST_FLOW_ERROR;
}
}
static gboolean
gst_faac_sink_event (GstPad * pad, GstEvent * event)
{
@ -472,46 +595,17 @@ gst_faac_sink_event (GstPad * pad, GstEvent * event)
faac = GST_FAAC (gst_pad_get_parent (pad));
GST_LOG_OBJECT (faac, "received %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
{
GstBuffer *outbuf;
if (!faac->handle)
ret = FALSE;
else
ret = TRUE;
/* flush first */
GST_DEBUG ("Pushing out remaining buffers because of EOS");
while (ret) {
if (gst_pad_alloc_buffer_and_set_caps (faac->srcpad,
GST_BUFFER_OFFSET_NONE, faac->bytes,
GST_PAD_CAPS (faac->srcpad), &outbuf) == GST_FLOW_OK) {
gint ret_size;
GST_DEBUG ("next_ts %" GST_TIME_FORMAT,
GST_TIME_ARGS (faac->next_ts));
if ((ret_size = faacEncEncode (faac->handle, NULL, 0,
GST_BUFFER_DATA (outbuf), faac->bytes)) > 0) {
GST_BUFFER_SIZE (outbuf) = ret_size;
GST_BUFFER_TIMESTAMP (outbuf) = faac->next_ts;
/* faac seems to always consume a fixed number of input samples,
* therefore extrapolate the duration from that value and the incoming
* bitrate */
GST_BUFFER_DURATION (outbuf) = gst_util_uint64_scale (faac->samples,
GST_SECOND, faac->channels * faac->samplerate);
if (GST_CLOCK_TIME_IS_VALID (faac->next_ts))
faac->next_ts += GST_BUFFER_DURATION (outbuf);
gst_pad_push (faac->srcpad, outbuf);
} else {
gst_buffer_unref (outbuf);
ret = FALSE;
}
} else
ret = FALSE;
if (faac->handle) {
/* flush first */
GST_DEBUG_OBJECT (faac, "Pushing out remaining buffers because of EOS");
gst_faac_push_buffers (faac, TRUE);
}
ret = gst_pad_event_default (pad, event);
break;
}
@ -534,9 +628,7 @@ static GstFlowReturn
gst_faac_chain (GstPad * pad, GstBuffer * inbuf)
{
GstFlowReturn result = GST_FLOW_OK;
GstBuffer *outbuf, *subbuf;
GstFaac *faac;
guint size, ret_size, in_size, frame_size;
faac = GST_FAAC (gst_pad_get_parent (pad));
@ -548,124 +640,13 @@ gst_faac_chain (GstPad * pad, GstBuffer * inbuf)
goto nego_failed;
}
GST_DEBUG ("Got buffer time:%" GST_TIME_FORMAT " duration:%" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (inbuf)),
GST_LOG_OBJECT (faac, "Got buffer time: %" GST_TIME_FORMAT " duration: %"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (inbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (inbuf)));
size = GST_BUFFER_SIZE (inbuf);
in_size = size;
if (faac->cache)
in_size += GST_BUFFER_SIZE (faac->cache);
frame_size = faac->samples * faac->bps;
gst_adapter_push (faac->adapter, inbuf);
while (1) {
/* do we have enough data for one frame? */
if (in_size / faac->bps < faac->samples) {
if (in_size > size) {
GstBuffer *merge;
/* this is panic! we got a buffer, but still don't have enough
* data. Merge them and retry in the next cycle... */
merge = gst_buffer_merge (faac->cache, inbuf);
gst_buffer_unref (faac->cache);
gst_buffer_unref (inbuf);
faac->cache = merge;
} else if (in_size == size) {
/* this shouldn't happen, but still... */
faac->cache = inbuf;
} else if (in_size > 0) {
faac->cache = gst_buffer_create_sub (inbuf, size - in_size, in_size);
GST_BUFFER_DURATION (faac->cache) =
GST_BUFFER_DURATION (inbuf) * GST_BUFFER_SIZE (faac->cache) / size;
GST_BUFFER_TIMESTAMP (faac->cache) =
GST_BUFFER_TIMESTAMP (inbuf) + (GST_BUFFER_DURATION (inbuf) *
(size - in_size) / size);
gst_buffer_unref (inbuf);
} else {
gst_buffer_unref (inbuf);
}
goto done;
}
/* create the frame */
if (in_size > size) {
GstBuffer *merge;
/* merge */
subbuf = gst_buffer_create_sub (inbuf, 0, frame_size - (in_size - size));
GST_BUFFER_DURATION (subbuf) =
GST_BUFFER_DURATION (inbuf) * GST_BUFFER_SIZE (subbuf) / size;
merge = gst_buffer_merge (faac->cache, subbuf);
gst_buffer_unref (faac->cache);
gst_buffer_unref (subbuf);
subbuf = merge;
faac->cache = NULL;
} else {
subbuf = gst_buffer_create_sub (inbuf, size - in_size, frame_size);
GST_BUFFER_DURATION (subbuf) =
GST_BUFFER_DURATION (inbuf) * GST_BUFFER_SIZE (subbuf) / size;
GST_BUFFER_TIMESTAMP (subbuf) =
GST_BUFFER_TIMESTAMP (inbuf) + (GST_BUFFER_DURATION (inbuf) *
(size - in_size) / size);
}
result =
gst_pad_alloc_buffer_and_set_caps (faac->srcpad, GST_BUFFER_OFFSET_NONE,
faac->bytes, GST_PAD_CAPS (faac->srcpad), &outbuf);
if (result != GST_FLOW_OK)
goto done;
if ((ret_size = faacEncEncode (faac->handle,
(gint32 *) GST_BUFFER_DATA (subbuf),
GST_BUFFER_SIZE (subbuf) / faac->bps,
GST_BUFFER_DATA (outbuf), faac->bytes)) < 0) {
GST_ELEMENT_ERROR (faac, LIBRARY, ENCODE, (NULL), (NULL));
gst_buffer_unref (inbuf);
gst_buffer_unref (subbuf);
result = GST_FLOW_ERROR;
goto done;
}
if (ret_size > 0) {
GST_BUFFER_SIZE (outbuf) = ret_size;
if (faac->cache_time != GST_CLOCK_TIME_NONE) {
GST_BUFFER_TIMESTAMP (outbuf) = faac->cache_time;
faac->cache_time = GST_CLOCK_TIME_NONE;
} else
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (subbuf);
GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (subbuf);
if (faac->cache_duration) {
GST_BUFFER_DURATION (outbuf) += faac->cache_duration;
faac->cache_duration = 0;
}
/* Store the value of the next expected timestamp to output
* This is required in order to output the trailing encoded packets
* at EOS with proper timestamps and duration. */
faac->next_ts =
GST_BUFFER_TIMESTAMP (outbuf) + GST_BUFFER_DURATION (outbuf);
GST_DEBUG ("Pushing out buffer time:%" GST_TIME_FORMAT " duration:%"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)));
result = gst_pad_push (faac->srcpad, outbuf);
} else {
/* FIXME: what I'm doing here isn't fully correct, but there
* really isn't a better way yet.
* Problem is that libfaac caches buffers (for encoding
* purposes), so the timestamp of the outgoing buffer isn't
* the same as the timestamp of the data that I pushed in.
* However, I don't know the delay between those two so I
* cannot really say aything about it. This is a bad guess. */
gst_buffer_unref (outbuf);
if (faac->cache_time != GST_CLOCK_TIME_NONE)
faac->cache_time = GST_BUFFER_TIMESTAMP (subbuf);
faac->cache_duration += GST_BUFFER_DURATION (subbuf);
}
in_size -= frame_size;
gst_buffer_unref (subbuf);
}
result = gst_faac_push_buffers (faac, FALSE);
done:
gst_object_unref (faac);
@ -784,15 +765,10 @@ gst_faac_change_state (GstElement * element, GstStateChange transition)
faacEncClose (faac->handle);
faac->handle = NULL;
}
if (faac->cache) {
gst_buffer_unref (faac->cache);
faac->cache = NULL;
}
faac->cache_time = GST_CLOCK_TIME_NONE;
faac->cache_duration = 0;
gst_adapter_clear (faac->adapter);
faac->offset = 0;
faac->samplerate = -1;
faac->channels = -1;
faac->next_ts = GST_CLOCK_TIME_NONE;
GST_OBJECT_UNLOCK (faac);
break;
}

10
ext/faac/gstfaac.h
View file

@ -21,6 +21,8 @@
#define __GST_FAAC_H__
#include <gst/gst.h>
#include <gst/base/gstadapter.h>
#include <gst/audio/audio.h>
#include <faac.h>
G_BEGIN_DECLS
@ -60,11 +62,9 @@ typedef struct _GstFaac {
faacEncHandle handle;
/* cache of the input */
GstBuffer *cache;
guint64 cache_time, cache_duration;
/* Expected timestamp of the next buffer to output */
GstClockTime next_ts;
GstAdapter *adapter;
/* offset of data to be encoded next */
guint offset;
} GstFaac;
typedef struct _GstFaacClass {