gstreamer/ext/ffmpeg/gstffmpegdec.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <assert.h>
#include <string.h>
#ifdef HAVE_FFMPEG_UNINSTALLED
#include <avcodec.h>
#else
#include <ffmpeg/avcodec.h>
#endif
#include <gst/gst.h>
#include "gstffmpegcodecmap.h"
typedef struct _GstFFMpegDec GstFFMpegDec;
struct _GstFFMpegDec {
GstElement element;
/* We need to keep track of our pads, so we do so here. */
GstPad *srcpad;
GstPad *sinkpad;
AVCodecContext *context;
AVFrame *picture;
gboolean opened;
};
typedef struct _GstFFMpegDecClass GstFFMpegDecClass;
struct _GstFFMpegDecClass {
GstElementClass parent_class;
AVCodec *in_plugin;
GstPadTemplate *srctempl, *sinktempl;
};
typedef struct {
AVCodec *in_plugin;
GstPadTemplate *srctempl, *sinktempl;
} GstFFMpegDecClassParams;
#define GST_TYPE_FFMPEGDEC \
(gst_ffmpegdec_get_type())
#define GST_FFMPEGDEC(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_FFMPEGDEC,GstFFMpegDec))
#define GST_FFMPEGDEC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_FFMPEGDEC,GstFFMpegDecClass))
#define GST_IS_FFMPEGDEC(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_FFMPEGDEC))
#define GST_IS_FFMPEGDEC_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_FFMPEGDEC))
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static GHashTable *global_plugins;
/* A number of functon prototypes are given so we can refer to them later. */
static void gst_ffmpegdec_class_init (GstFFMpegDecClass *klass);
static void gst_ffmpegdec_init (GstFFMpegDec *ffmpegdec);
static void gst_ffmpegdec_dispose (GObject *object);
static GstPadLinkReturn gst_ffmpegdec_connect (GstPad *pad,
GstCaps *caps);
static void gst_ffmpegdec_chain (GstPad *pad,
GstData *data);
static GstElementStateReturn
gst_ffmpegdec_change_state (GstElement *element);
#if 0
/* some sort of bufferpool handling, but different */
static int gst_ffmpegdec_get_buffer (AVCodecContext *context,
AVFrame *picture);
static void gst_ffmpegdec_release_buffer (AVCodecContext *context,
AVFrame *picture);
#endif
static GstElementClass *parent_class = NULL;
/*static guint gst_ffmpegdec_signals[LAST_SIGNAL] = { 0 }; */
static void
gst_ffmpegdec_class_init (GstFFMpegDecClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstFFMpegDecClassParams *params;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
params = g_hash_table_lookup (global_plugins,
GINT_TO_POINTER (G_OBJECT_CLASS_TYPE (gobject_class)));
klass->in_plugin = params->in_plugin;
klass->srctempl = params->srctempl;
klass->sinktempl = params->sinktempl;
gobject_class->dispose = gst_ffmpegdec_dispose;
gstelement_class->change_state = gst_ffmpegdec_change_state;
}
static void
gst_ffmpegdec_init (GstFFMpegDec *ffmpegdec)
{
GstFFMpegDecClass *oclass = (GstFFMpegDecClass*)(G_OBJECT_GET_CLASS (ffmpegdec));
/* setup pads */
ffmpegdec->sinkpad = gst_pad_new_from_template (oclass->sinktempl, "sink");
gst_pad_set_link_function (ffmpegdec->sinkpad, gst_ffmpegdec_connect);
gst_pad_set_chain_function (ffmpegdec->sinkpad, gst_ffmpegdec_chain);
ffmpegdec->srcpad = gst_pad_new_from_template (oclass->srctempl, "src");
gst_element_add_pad (GST_ELEMENT (ffmpegdec), ffmpegdec->sinkpad);
gst_element_add_pad (GST_ELEMENT (ffmpegdec), ffmpegdec->srcpad);
/* some ffmpeg data */
ffmpegdec->context = avcodec_alloc_context();
ffmpegdec->picture = avcodec_alloc_frame();
ffmpegdec->opened = FALSE;
}
static void
gst_ffmpegdec_dispose (GObject *object)
{
GstFFMpegDec *ffmpegdec = (GstFFMpegDec *) object;
/* close old session */
if (ffmpegdec->opened) {
avcodec_close (ffmpegdec->context);
ffmpegdec->opened = FALSE;
}
/* clean up remaining allocated data */
av_free (ffmpegdec->context);
av_free (ffmpegdec->picture);
}
static GstPadLinkReturn
gst_ffmpegdec_connect (GstPad *pad,
GstCaps *caps)
{
GstFFMpegDec *ffmpegdec = (GstFFMpegDec *)(gst_pad_get_parent (pad));
GstFFMpegDecClass *oclass = (GstFFMpegDecClass*)(G_OBJECT_GET_CLASS (ffmpegdec));
/* we want fixed caps */
if (!GST_CAPS_IS_FIXED (caps))
return GST_PAD_LINK_DELAYED;
/* close old session */
if (ffmpegdec->opened) {
avcodec_close (ffmpegdec->context);
ffmpegdec->opened = FALSE;
}
/* set defaults */
avcodec_get_context_defaults (ffmpegdec->context);
#if 0
/* set buffer functions */
ffmpegdec->context->get_buffer = gst_ffmpegdec_get_buffer;
ffmpegdec->context->release_buffer = gst_ffmpegdec_release_buffer;
#endif
/* get size and so */
gst_ffmpeg_caps_to_codectype (oclass->in_plugin->type,
caps, ffmpegdec->context);
/* we dont send complete frames */
if (oclass->in_plugin->capabilities & CODEC_CAP_TRUNCATED)
ffmpegdec->context->flags |= CODEC_FLAG_TRUNCATED;
/* do *not* draw edges */
ffmpegdec->context->flags |= CODEC_FLAG_EMU_EDGE;
/* open codec - we don't select an output pix_fmt yet,
* simply because we don't know! We only get it
* during playback... */
if (avcodec_open (ffmpegdec->context, oclass->in_plugin) < 0) {
GST_DEBUG (
"ffdec_%s: Failed to open FFMPEG codec",
oclass->in_plugin->name);
return GST_PAD_LINK_REFUSED;
}
/* done! */
ffmpegdec->opened = TRUE;
return GST_PAD_LINK_OK;
}
#if 0
static int
gst_ffmpegdec_get_buffer (AVCodecContext *context,
AVFrame *picture)
{
GstBuffer *buf = NULL;
gulong bufsize = 0;
switch (context->codec_type) {
case CODEC_TYPE_VIDEO:
bufsize = avpicture_get_size (context->pix_fmt,
context->width,
context->height);
buf = gst_buffer_new_and_alloc (bufsize);
avpicture_fill ((AVPicture *) picture, GST_BUFFER_DATA (buf),
context->pix_fmt,
context->width, context->height);
break;
case CODEC_TYPE_AUDIO:
default:
g_assert (0);
break;
}
/* tell ffmpeg we own this buffer
*
* we also use an evil hack (keep buffer in base[0])
* to keep a reference to the buffer in release_buffer(),
* so that we can ref() it here and unref() it there
* so that we don't need to copy data */
picture->type = FF_BUFFER_TYPE_USER;
picture->age = G_MAXINT;
picture->base[0] = (int8_t *) buf;
gst_buffer_ref (buf);
return 0;
}
static void
gst_ffmpegdec_release_buffer (AVCodecContext *context,
AVFrame *picture)
{
gint i;
GstBuffer *buf = GST_BUFFER (picture->base[0]);
gst_buffer_unref (buf);
/* zero out the reference in ffmpeg */
for (i=0;i<4;i++) {
picture->data[i] = NULL;
picture->linesize[i] = 0;
}
}
#endif
static void
gst_ffmpegdec_chain (GstPad *pad,
GstData *_data)
{
GstBuffer *inbuf = GST_BUFFER (_data);
GstBuffer *outbuf = NULL;
GstFFMpegDec *ffmpegdec = (GstFFMpegDec *)(gst_pad_get_parent (pad));
GstFFMpegDecClass *oclass = (GstFFMpegDecClass*)(G_OBJECT_GET_CLASS (ffmpegdec));
guchar *data;
gint size, len = 0;
gint have_data;
if (!ffmpegdec->opened) {
gst_element_error (GST_ELEMENT (ffmpegdec),
"ffdec_%s: input format was not set before data-start",
oclass->in_plugin->name);
return;
}
/* FIXME: implement event awareness (especially EOS
* (av_close_codec ()) and FLUSH/DISCONT
* (avcodec_flush_buffers ()))
*/
data = GST_BUFFER_DATA (inbuf);
size = GST_BUFFER_SIZE (inbuf);
do {
ffmpegdec->context->frame_number++;
switch (oclass->in_plugin->type) {
case CODEC_TYPE_VIDEO:
len = avcodec_decode_video (ffmpegdec->context,
ffmpegdec->picture,
&have_data,
data, size);
if (have_data) {
/* libavcodec constantly crashes on stupid buffer allocation
* errors inside. This drives me crazy, so we let it allocate
* it's own buffers and copy to our own buffer afterwards... */
AVPicture pic;
gint size = avpicture_get_size (ffmpegdec->context->pix_fmt,
ffmpegdec->context->width,
ffmpegdec->context->height);
outbuf = gst_buffer_new_and_alloc (size);
avpicture_fill (&pic, GST_BUFFER_DATA (outbuf),
ffmpegdec->context->pix_fmt,
ffmpegdec->context->width,
ffmpegdec->context->height);
img_convert (&pic, ffmpegdec->context->pix_fmt,
(AVPicture *) ffmpegdec->picture,
ffmpegdec->context->pix_fmt,
ffmpegdec->context->width,
ffmpegdec->context->height);
/* this isn't necessarily true, but it's better than nothing */
GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (inbuf);
}
break;
case CODEC_TYPE_AUDIO:
outbuf = gst_buffer_new_and_alloc (AVCODEC_MAX_AUDIO_FRAME_SIZE);
len = avcodec_decode_audio (ffmpegdec->context,
(int16_t *) GST_BUFFER_DATA (outbuf),
&have_data,
data, size);
if (have_data) {
GST_BUFFER_SIZE (outbuf) = have_data;
GST_BUFFER_DURATION (outbuf) = (have_data * GST_SECOND) /
(ffmpegdec->context->channels *
ffmpegdec->context->sample_rate);
} else {
gst_buffer_unref (outbuf);
}
break;
default:
g_assert(0);
break;
}
if (len < 0) {
g_warning ("ffdec_%s: decoding error",
oclass->in_plugin->name);
break;
}
if (have_data) {
if (!GST_PAD_CAPS (ffmpegdec->srcpad)) {
GstCaps *caps;
caps = gst_ffmpeg_codectype_to_caps (oclass->in_plugin->type,
ffmpegdec->context);
if (caps == NULL ||
gst_pad_try_set_caps (ffmpegdec->srcpad, caps) <= 0) {
gst_element_error (GST_ELEMENT (ffmpegdec),
"Failed to link ffmpeg decoder (%s) to next element",
oclass->in_plugin->name);
return;
}
}
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (inbuf);
gst_pad_push (ffmpegdec->srcpad, GST_DATA (outbuf));
}
size -= len;
data += len;
} while (size > 0);
gst_buffer_unref (inbuf);
}
static GstElementStateReturn
gst_ffmpegdec_change_state (GstElement *element)
{
GstFFMpegDec *ffmpegdec = (GstFFMpegDec *) element;
gint transition = GST_STATE_TRANSITION (element);
switch (transition) {
case GST_STATE_PAUSED_TO_READY:
if (ffmpegdec->opened) {
avcodec_close (ffmpegdec->context);
ffmpegdec->opened = FALSE;
}
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
gboolean
gst_ffmpegdec_register (GstPlugin *plugin)
{
GstElementFactory *factory;
GTypeInfo typeinfo = {
sizeof(GstFFMpegDecClass),
NULL,
NULL,
(GClassInitFunc)gst_ffmpegdec_class_init,
NULL,
NULL,
sizeof(GstFFMpegDec),
0,
(GInstanceInitFunc)gst_ffmpegdec_init,
};
GType type;
GstElementDetails *details;
AVCodec *in_plugin;
in_plugin = first_avcodec;
global_plugins = g_hash_table_new (NULL, NULL);
while (in_plugin) {
gchar *type_name;
GstPadTemplate *sinktempl, *srctempl;
GstCaps *sinkcaps, *srccaps;
GstFFMpegDecClassParams *params;
/* no quasi-codecs, please */
if (in_plugin->id == CODEC_ID_RAWVIDEO ||
(in_plugin->id >= CODEC_ID_PCM_S16LE &&
in_plugin->id <= CODEC_ID_PCM_ALAW)) {
goto next;
}
/* only decoders */
if (!in_plugin->decode) {
goto next;
}
/* first make sure we've got a supported type */
sinkcaps = gst_ffmpeg_codecid_to_caps (in_plugin->id, NULL);
srccaps = gst_ffmpeg_codectype_to_caps (in_plugin->type, NULL);
if (!sinkcaps || !srccaps)
goto next;
/* construct the type */
type_name = g_strdup_printf("ffdec_%s", in_plugin->name);
/* if it's already registered, drop it */
if (g_type_from_name(type_name)) {
g_free(type_name);
goto next;
}
/* create the gtk type now */
type = g_type_register_static(GST_TYPE_ELEMENT, type_name , &typeinfo, 0);
/* construct the element details struct */
details = g_new0 (GstElementDetails, 1);
details->longname = g_strdup_printf("FFMPEG %s decoder", in_plugin->name);
details->klass = g_strdup_printf("Codec/%s/Decoder",
(in_plugin->type == CODEC_TYPE_VIDEO) ?
"Video" : "Audio");
details->license = g_strdup("LGPL");
details->description = g_strdup_printf("FFMPEG %s decoder",
in_plugin->name);
details->version = g_strdup(VERSION);
details->author = g_strdup("The FFMPEG crew, "
"Wim Taymans <wim.taymans@chello.be>, "
"Ronald Bultje <rbultje@ronald.bitfreak.net>");
details->copyright = g_strdup("(c) 2001-2003");
/* register the plugin with gstreamer */
factory = gst_element_factory_new(type_name,type,details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_element_factory_set_rank (factory, GST_ELEMENT_RANK_MARGINAL);
sinktempl = gst_pad_template_new ("sink", GST_PAD_SINK,
GST_PAD_ALWAYS, sinkcaps, NULL);
gst_element_factory_add_pad_template (factory, sinktempl);
srctempl = gst_pad_template_new ("src", GST_PAD_SRC,
GST_PAD_ALWAYS, srccaps, NULL);
gst_element_factory_add_pad_template (factory, srctempl);
params = g_new0 (GstFFMpegDecClassParams, 1);
params->in_plugin = in_plugin;
params->sinktempl = sinktempl;
params->srctempl = srctempl;
g_hash_table_insert (global_plugins,
GINT_TO_POINTER (type),
(gpointer) params);
/* The very last thing is to register the elementfactory with the plugin. */
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
next:
in_plugin = in_plugin->next;
}
return TRUE;
}