gstffmpegdec.c 13.6 KB
Newer Older
Andy Wingo Wingo's avatar
Andy Wingo Wingo committed
1
/* GStreamer
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
 * 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.
 */

20 21
#include "config.h"

22
#include <assert.h>
23
#include <string.h>
24

25 26 27 28 29
#ifdef HAVE_FFMPEG_UNINSTALLED
#include <avcodec.h>
#else
#include <ffmpeg/avcodec.h>
#endif
30 31 32

#include <gst/gst.h>

33
#include "gstffmpegcodecmap.h"
34

35 36 37 38 39 40 41 42 43 44
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;
45
  AVFrame *picture;
46
  gboolean opened;
47 48 49 50 51 52 53 54
};

typedef struct _GstFFMpegDecClass GstFFMpegDecClass;

struct _GstFFMpegDecClass {
  GstElementClass parent_class;

  AVCodec *in_plugin;
55
  GstPadTemplate *srctempl, *sinktempl;
56 57
};

58 59
typedef struct {
  AVCodec *in_plugin;
60
  GstPadTemplate *srctempl, *sinktempl;
61
} GstFFMpegDecClassParams;
62

63 64 65 66 67 68 69 70 71 72
#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))
73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88

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);
89 90 91 92 93
static void	gst_ffmpegdec_dispose		(GObject      *object);

static GstPadLinkReturn	gst_ffmpegdec_connect	(GstPad    *pad,
						 GstCaps   *caps);
static void	gst_ffmpegdec_chain		(GstPad    *pad,
94
						 GstData   *data);
95

96 97
static GstElementStateReturn
		gst_ffmpegdec_change_state	(GstElement *element);
98

99 100 101 102 103
/* 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);
104 105 106

static GstElementClass *parent_class = NULL;

107
/*static guint gst_ffmpegdec_signals[LAST_SIGNAL] = { 0 }; */
108 109 110 111 112 113

static void
gst_ffmpegdec_class_init (GstFFMpegDecClass *klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
114
  GstFFMpegDecClassParams *params;
115 116 117 118 119 120

  gobject_class = (GObjectClass*)klass;
  gstelement_class = (GstElementClass*)klass;

  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);

121
  params = g_hash_table_lookup (global_plugins,
122 123
		  GINT_TO_POINTER (G_OBJECT_CLASS_TYPE (gobject_class)));

124
  klass->in_plugin = params->in_plugin;
125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
  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;
  }
162

163 164 165
  /* clean up remaining allocated data */
  av_free (ffmpegdec->context);
  av_free (ffmpegdec->picture);
166 167
}

Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
168
static GstPadLinkReturn
169 170
gst_ffmpegdec_connect (GstPad  *pad,
		       GstCaps *caps)
171 172 173 174
{
  GstFFMpegDec *ffmpegdec = (GstFFMpegDec *)(gst_pad_get_parent (pad));
  GstFFMpegDecClass *oclass = (GstFFMpegDecClass*)(G_OBJECT_GET_CLASS (ffmpegdec));

175
  /* we want fixed caps */
176
  if (!GST_CAPS_IS_FIXED (caps))
177
    return GST_PAD_LINK_DELAYED;
178

179 180 181 182 183
  /* close old session */
  if (ffmpegdec->opened) {
    avcodec_close (ffmpegdec->context);
    ffmpegdec->opened = FALSE;
  }
184

185 186
  /* set defaults */
  avcodec_get_context_defaults (ffmpegdec->context);
187

188 189 190 191
  /* set buffer functions */
  ffmpegdec->context->get_buffer = gst_ffmpegdec_get_buffer;
  ffmpegdec->context->release_buffer = gst_ffmpegdec_release_buffer;

192 193 194
  /* get size and so */
  gst_ffmpeg_caps_to_codectype (oclass->in_plugin->type,
				caps, ffmpegdec->context);
195

196 197 198 199
  /* we dont send complete frames */
  if (oclass->in_plugin->capabilities & CODEC_CAP_TRUNCATED)
    ffmpegdec->context->flags |= CODEC_FLAG_TRUNCATED;

200 201 202
  /* do *not* draw edges */
  ffmpegdec->context->flags |= CODEC_FLAG_EMU_EDGE;

203 204 205
  /* open codec - we don't select an output pix_fmt yet,
   * simply because we don't know! We only get it
   * during playback... */
206
  if (avcodec_open (ffmpegdec->context, oclass->in_plugin) < 0) {
207
    GST_DEBUG (
208 209
		"ffdec_%s: Failed to open FFMPEG codec",
		oclass->in_plugin->name);
210
    return GST_PAD_LINK_REFUSED;
211
  }
212 213 214 215

  /* done! */
  ffmpegdec->opened = TRUE;

216
  return GST_PAD_LINK_OK;
217 218
}

219 220 221 222 223 224 225 226 227
static int
gst_ffmpegdec_get_buffer (AVCodecContext *context,
			  AVFrame        *picture)
{
  GstBuffer *buf = NULL;
  gulong bufsize = 0;

  switch (context->codec_type) {
    case CODEC_TYPE_VIDEO:
228
      bufsize = avpicture_get_size (context->pix_fmt,
229 230 231 232 233 234
				    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);
235 236 237 238 239 240
      break;

    case CODEC_TYPE_AUDIO:
    default:
      g_assert (0);
      break;
241 242
  }

243 244 245 246 247 248 249 250 251 252 253 254 255
  /* 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;
}
256

257 258 259 260 261 262 263 264 265 266 267 268 269
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;
  }
270 271 272
}

static void
273
gst_ffmpegdec_chain (GstPad    *pad,
274
		     GstData *_data)
275
{
276
  GstBuffer *inbuf = GST_BUFFER (_data);
277
  GstBuffer *outbuf = NULL;
278
  GstFFMpegDec *ffmpegdec = (GstFFMpegDec *)(gst_pad_get_parent (pad));
279
  GstFFMpegDecClass *oclass = (GstFFMpegDecClass*)(G_OBJECT_GET_CLASS (ffmpegdec));
280
  guchar *data;
281 282 283
  gint size, len = 0;
  gint have_data;

Ronald S. Bultje's avatar
Ronald S. Bultje committed
284
  if (!ffmpegdec->opened) {
285 286 287
    gst_element_error (GST_ELEMENT (ffmpegdec),
		       "ffdec_%s: input format was not set before data-start",
		       oclass->in_plugin->name);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
288 289 290
    return;
  }

291 292 293 294
  /* FIXME: implement event awareness (especially EOS
   * (av_close_codec ()) and FLUSH/DISCONT
   * (avcodec_flush_buffers ()))
   */
295 296 297 298 299 300 301

  data = GST_BUFFER_DATA (inbuf);
  size = GST_BUFFER_SIZE (inbuf);

  do {
    ffmpegdec->context->frame_number++;

302 303 304 305 306 307
    switch (oclass->in_plugin->type) {
      case CODEC_TYPE_VIDEO:
        len = avcodec_decode_video (ffmpegdec->context,
				    ffmpegdec->picture,
				    &have_data,
				    data, size);
308 309 310 311 312 313
        if (have_data) {
          outbuf = GST_BUFFER (ffmpegdec->picture->base[0]);
          GST_BUFFER_SIZE (outbuf) = GST_BUFFER_MAXSIZE (outbuf);
          /* this isn't necessarily true, but it's better than nothing */
          GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (inbuf);
        }
314
        break;
315

316
      case CODEC_TYPE_AUDIO:
317
        outbuf = gst_buffer_new_and_alloc (AVCODEC_MAX_AUDIO_FRAME_SIZE);
318
        len = avcodec_decode_audio (ffmpegdec->context,
319
				    (int16_t *) GST_BUFFER_DATA (outbuf),
320 321
				    &have_data,
				    data, size);
322 323 324 325 326 327 328 329
        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);
        } 
330 331 332 333 334
        break;
      default:
	g_assert(0);
        break;
    }
335 336

    if (len < 0) {
337 338
      g_warning ("ffdec_%s: decoding error",
		 oclass->in_plugin->name);
339 340 341
      break;
    }

342
    if (have_data) {
343
      if (!GST_PAD_CAPS (ffmpegdec->srcpad)) {
344 345 346 347 348
        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) {
349 350 351
          gst_element_error (GST_ELEMENT (ffmpegdec),
			     "Failed to link ffmpeg decoder (%s) to next element",
			     oclass->in_plugin->name);
352 353
          return;
        }
354 355 356
      }

      GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (inbuf);
357

358
      gst_pad_push (ffmpegdec->srcpad, GST_DATA (outbuf));
359 360 361 362
    } 

    size -= len;
    data += len;
363
  } while (size > 0);
364 365 366 367

  gst_buffer_unref (inbuf);
}

368 369
static GstElementStateReturn
gst_ffmpegdec_change_state (GstElement *element)
370
{
371 372 373 374 375 376 377 378 379
  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;
      }
380 381 382
      break;
  }

383 384
  if (GST_ELEMENT_CLASS (parent_class)->change_state)
    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
385

386
  return GST_STATE_SUCCESS;
387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413
}

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;
414 415
    GstPadTemplate *sinktempl, *srctempl;
    GstCaps *sinkcaps, *srccaps;
416
    GstFFMpegDecClassParams *params;
417

Ronald S. Bultje's avatar
Ronald S. Bultje committed
418 419 420 421 422
    /* 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;
423
    }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
424 425 426

    /* only decoders */
    if (!in_plugin->decode) {
427 428
      goto next;
    }
429 430 431 432 433 434 435

    /* 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;

436
    /* construct the type */
Ronald S. Bultje's avatar
Ronald S. Bultje committed
437
    type_name = g_strdup_printf("ffdec_%s", in_plugin->name);
438

439
    /* if it's already registered, drop it */
440 441 442 443 444
    if (g_type_from_name(type_name)) {
      g_free(type_name);
      goto next;
    }

445
    /* create the gtk type now */
446 447
    type = g_type_register_static(GST_TYPE_ELEMENT, type_name , &typeinfo, 0);

448
    /* construct the element details struct */
449 450
    details = g_new0 (GstElementDetails, 1);
    details->longname = g_strdup(in_plugin->name);
451
    details->klass = g_strdup_printf("Codec/%s/Decoder",
452
				     (in_plugin->type == CODEC_TYPE_VIDEO) ?
453
				     "Video" : "Audio");
454
    details->license = g_strdup("LGPL");
455 456
    details->description = g_strdup_printf("FFMPEG %s decoder",
					   in_plugin->name);
457
    details->version = g_strdup(VERSION);
458 459
    details->author = g_strdup("The FFMPEG crew, "
				"Wim Taymans <wim.taymans@chello.be>, "
460 461
				"Ronald Bultje <rbultje@ronald.bitfreak.net>");
    details->copyright = g_strdup("(c) 2001-2003");
462

463
    /* register the plugin with gstreamer */
464
    factory = gst_element_factory_new(type_name,type,details);
465 466
    g_return_val_if_fail(factory != NULL, FALSE);

467
    gst_element_factory_set_rank (factory, GST_ELEMENT_RANK_MARGINAL);
468

469 470
    sinktempl = gst_pad_template_new ("sink", GST_PAD_SINK,
				      GST_PAD_ALWAYS, sinkcaps, NULL);
471 472
    gst_element_factory_add_pad_template (factory, sinktempl);

473 474 475 476
    srctempl = gst_pad_template_new ("src", GST_PAD_SRC,
				     GST_PAD_ALWAYS, srccaps, NULL);
    gst_element_factory_add_pad_template (factory, srctempl);

477
    params = g_new0 (GstFFMpegDecClassParams, 1);
478
    params->in_plugin = in_plugin;
479 480
    params->sinktempl = sinktempl;
    params->srctempl = srctempl;
481 482 483 484

    g_hash_table_insert (global_plugins, 
		         GINT_TO_POINTER (type), 
			 (gpointer) params);
485 486 487 488 489 490 491 492 493 494

    /* 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;
}