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gstreamer/ext/mpeg2dec/gstmpeg2dec.c
Vincent Penquerc'h a09bad4d98 mpeg2dec: fix spurious failure to decode some files 
Parsing can return with an 'invalid' state, but this is not
actually fatal. For one, the mpeg2dec command line tool that
comes with the libmpeg2 library blithely ignores this condition
and merrily goes on. So we do this same, logging the error,
and going on with parsing. This makes something work that did
not use to work, and brings happiness to the world.

https://bugzilla.gnome.org/show_bug.cgi?id=429476
2011-08-23 10:04:48 +02:00

1802 lines
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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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <inttypes.h>
#include "gstmpeg2dec.h"
/* 16byte-aligns a buffer for libmpeg2 */
#define ALIGN_16(p) ((void *)(((uintptr_t)(p) + 15) & ~((uintptr_t)15)))
/* mpeg2dec changed a struct name after 0.3.1, here's a workaround */
/* mpeg2dec also only defined MPEG2_RELEASE after 0.3.1
#if MPEG2_RELEASE < MPEG2_VERSION(0,3,2)
*/
#ifndef MPEG2_RELEASE
#define MPEG2_VERSION(a,b,c) ((((a)&0xff)<<16)|(((b)&0xff)<<8)|((c)&0xff))
#define MPEG2_RELEASE MPEG2_VERSION(0,3,1)
typedef picture_t mpeg2_picture_t;
typedef gint mpeg2_state_t;
#define STATE_BUFFER 0
#endif
GST_DEBUG_CATEGORY_STATIC (mpeg2dec_debug);
#define GST_CAT_DEFAULT (mpeg2dec_debug)
/* Send a warning message about decoding errors after receiving this many
* STATE_INVALID return values from mpeg2_parse. -1 means never.
*/
#define WARN_THRESHOLD (5)
//#define enable_user_data
#ifdef enable_user_data
static GstStaticPadTemplate user_data_template_factory =
GST_STATIC_PAD_TEMPLATE ("user_data",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
#endif
static GstStaticPadTemplate sink_template_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) [ 1, 2 ], " "systemstream = (boolean) false")
);
static GstStaticPadTemplate src_template_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv, "
"format = (fourcc) { YV12, I420, Y42B, Y444 }, "
"width = (int) [ 16, 4096 ], "
"height = (int) [ 16, 4096 ], "
"framerate = (fraction) [ 0/1, 2147483647/1 ]")
);
static void gst_mpeg2dec_base_init (gpointer g_class);
static void gst_mpeg2dec_class_init (GstMpeg2decClass * klass);
static void gst_mpeg2dec_init (GstMpeg2dec * mpeg2dec);
static void gst_mpeg2dec_finalize (GObject * object);
static void gst_mpeg2dec_reset (GstMpeg2dec * mpeg2dec);
static void gst_mpeg2dec_set_index (GstElement * element, GstIndex * index);
static GstIndex *gst_mpeg2dec_get_index (GstElement * element);
static gboolean gst_mpeg2dec_src_event (GstPad * pad, GstEvent * event);
static const GstQueryType *gst_mpeg2dec_get_src_query_types (GstPad * pad);
static gboolean gst_mpeg2dec_src_query (GstPad * pad, GstQuery * query);
static gboolean gst_mpeg2dec_sink_convert (GstPad * pad, GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
static gboolean gst_mpeg2dec_src_convert (GstPad * pad, GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
static GstStateChangeReturn gst_mpeg2dec_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_mpeg2dec_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_mpeg2dec_setcaps (GstPad * pad, GstCaps * caps);
static GstFlowReturn gst_mpeg2dec_chain (GstPad * pad, GstBuffer * buf);
static void clear_buffers (GstMpeg2dec * mpeg2dec);
//static gboolean gst_mpeg2dec_sink_query (GstPad * pad, GstQuery * query);
#if 0
static const GstFormat *gst_mpeg2dec_get_formats (GstPad * pad);
#endif
#if 0
static const GstEventMask *gst_mpeg2dec_get_event_masks (GstPad * pad);
#endif
static GstElementClass *parent_class = NULL;
static gboolean gst_mpeg2dec_crop_buffer (GstMpeg2dec * dec, GstBuffer ** buf);
/*static guint gst_mpeg2dec_signals[LAST_SIGNAL] = { 0 };*/
GType
gst_mpeg2dec_get_type (void)
{
static GType mpeg2dec_type = 0;
if (!mpeg2dec_type) {
static const GTypeInfo mpeg2dec_info = {
sizeof (GstMpeg2decClass),
gst_mpeg2dec_base_init,
NULL,
(GClassInitFunc) gst_mpeg2dec_class_init,
NULL,
NULL,
sizeof (GstMpeg2dec),
0,
(GInstanceInitFunc) gst_mpeg2dec_init,
};
mpeg2dec_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstMpeg2dec", &mpeg2dec_info,
0);
}
GST_DEBUG_CATEGORY_INIT (mpeg2dec_debug, "mpeg2dec", 0,
"MPEG2 decoder element");
return mpeg2dec_type;
}
static void
gst_mpeg2dec_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template_factory));
#ifdef enable_user_data
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&user_data_template_factory));
#endif
gst_element_class_set_details_simple (element_class,
"mpeg1 and mpeg2 video decoder", "Codec/Decoder/Video",
"Uses libmpeg2 to decode MPEG video streams",
"Wim Taymans <wim.taymans@chello.be>");
}
static void
gst_mpeg2dec_class_init (GstMpeg2decClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_mpeg2dec_finalize;
gstelement_class->change_state = gst_mpeg2dec_change_state;
gstelement_class->set_index = gst_mpeg2dec_set_index;
gstelement_class->get_index = gst_mpeg2dec_get_index;
}
static void
gst_mpeg2dec_init (GstMpeg2dec * mpeg2dec)
{
/* create the sink and src pads */
mpeg2dec->sinkpad =
gst_pad_new_from_static_template (&sink_template_factory, "sink");
gst_pad_set_chain_function (mpeg2dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_chain));
#if 0
gst_pad_set_query_function (mpeg2dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_get_sink_query));
#endif
gst_pad_set_event_function (mpeg2dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_sink_event));
gst_pad_set_setcaps_function (mpeg2dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_setcaps));
gst_element_add_pad (GST_ELEMENT (mpeg2dec), mpeg2dec->sinkpad);
mpeg2dec->srcpad =
gst_pad_new_from_static_template (&src_template_factory, "src");
gst_pad_set_event_function (mpeg2dec->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_src_event));
gst_pad_set_query_type_function (mpeg2dec->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_get_src_query_types));
gst_pad_set_query_function (mpeg2dec->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_src_query));
gst_pad_use_fixed_caps (mpeg2dec->srcpad);
gst_element_add_pad (GST_ELEMENT (mpeg2dec), mpeg2dec->srcpad);
#ifdef enable_user_data
mpeg2dec->userdatapad =
gst_pad_new_from_static_template (&user_data_template_factory,
"user_data");
gst_element_add_pad (GST_ELEMENT (mpeg2dec), mpeg2dec->userdatapad);
#endif
mpeg2dec->error_count = 0;
mpeg2dec->can_allocate_aligned = TRUE;
/* initialize the mpeg2dec acceleration */
}
static void
gst_mpeg2dec_finalize (GObject * object)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (object);
if (mpeg2dec->index) {
gst_object_unref (mpeg2dec->index);
mpeg2dec->index = NULL;
mpeg2dec->index_id = 0;
}
if (mpeg2dec->decoder) {
GST_DEBUG_OBJECT (mpeg2dec, "closing decoder");
mpeg2_close (mpeg2dec->decoder);
mpeg2dec->decoder = NULL;
}
clear_buffers (mpeg2dec);
g_free (mpeg2dec->dummybuf[3]);
mpeg2dec->dummybuf[3] = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_mpeg2dec_reset (GstMpeg2dec * mpeg2dec)
{
if (mpeg2dec->index) {
gst_object_unref (mpeg2dec->index);
mpeg2dec->index = NULL;
mpeg2dec->index_id = 0;
}
/* reset the initial video state */
mpeg2dec->format = GST_VIDEO_FORMAT_UNKNOWN;
mpeg2dec->width = -1;
mpeg2dec->height = -1;
gst_segment_init (&mpeg2dec->segment, GST_FORMAT_UNDEFINED);
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
mpeg2dec->frame_period = 0;
mpeg2dec->need_sequence = TRUE;
mpeg2dec->next_time = -1;
mpeg2dec->offset = 0;
mpeg2dec->error_count = 0;
mpeg2dec->can_allocate_aligned = TRUE;
mpeg2_reset (mpeg2dec->decoder, 1);
}
static void
gst_mpeg2dec_qos_reset (GstMpeg2dec * mpeg2dec)
{
GST_OBJECT_LOCK (mpeg2dec);
mpeg2dec->proportion = 1.0;
mpeg2dec->earliest_time = -1;
GST_OBJECT_UNLOCK (mpeg2dec);
}
static void
gst_mpeg2dec_set_index (GstElement * element, GstIndex * index)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (element);
GST_OBJECT_LOCK (mpeg2dec);
if (mpeg2dec->index)
gst_object_unref (mpeg2dec->index);
mpeg2dec->index = NULL;
mpeg2dec->index_id = 0;
if (index) {
mpeg2dec->index = gst_object_ref (index);
}
GST_OBJECT_UNLOCK (mpeg2dec);
/* object lock might be taken again */
if (index)
gst_index_get_writer_id (index, GST_OBJECT (element), &mpeg2dec->index_id);
}
static GstIndex *
gst_mpeg2dec_get_index (GstElement * element)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (element);
return (mpeg2dec->index) ? gst_object_ref (mpeg2dec->index) : NULL;
}
static GstFlowReturn
gst_mpeg2dec_crop_buffer (GstMpeg2dec * dec, GstBuffer ** buf)
{
GstFlowReturn flow_ret;
GstBuffer *inbuf = *buf;
GstBuffer *outbuf;
guint outsize, c;
outsize = gst_video_format_get_size (dec->format, dec->width, dec->height);
GST_LOG_OBJECT (dec, "Copying input buffer %ux%u (%u) to output buffer "
"%ux%u (%u)", dec->decoded_width, dec->decoded_height,
GST_BUFFER_SIZE (inbuf), dec->width, dec->height, outsize);
flow_ret = gst_pad_alloc_buffer_and_set_caps (dec->srcpad,
GST_BUFFER_OFFSET_NONE, outsize, GST_PAD_CAPS (dec->srcpad), &outbuf);
if (G_UNLIKELY (flow_ret != GST_FLOW_OK))
return flow_ret;
for (c = 0; c < 3; c++) {
const guint8 *src;
guint8 *dest;
guint stride_in, stride_out;
guint c_height, c_width, line;
src =
GST_BUFFER_DATA (inbuf) +
gst_video_format_get_component_offset (dec->format, c,
dec->decoded_width, dec->decoded_height);
dest =
GST_BUFFER_DATA (outbuf) +
gst_video_format_get_component_offset (dec->format, c, dec->width,
dec->height);
stride_out = gst_video_format_get_row_stride (dec->format, c, dec->width);
stride_in =
gst_video_format_get_row_stride (dec->format, c, dec->decoded_width);
c_height =
gst_video_format_get_component_height (dec->format, c, dec->height);
c_width = gst_video_format_get_component_width (dec->format, c, dec->width);
for (line = 0; line < c_height; line++) {
memcpy (dest, src, c_width);
dest += stride_out;
src += stride_in;
}
}
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (dec->srcpad));
gst_buffer_copy_metadata (outbuf, inbuf,
GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_FLAGS);
gst_buffer_unref (*buf);
*buf = outbuf;
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mpeg2dec_alloc_sized_buf (GstMpeg2dec * mpeg2dec, guint size,
GstBuffer ** obuf)
{
if (mpeg2dec->can_allocate_aligned
&& mpeg2dec->decoded_width == mpeg2dec->width
&& mpeg2dec->decoded_height == mpeg2dec->height) {
GstFlowReturn ret;
ret = gst_pad_alloc_buffer_and_set_caps (mpeg2dec->srcpad,
GST_BUFFER_OFFSET_NONE, size, GST_PAD_CAPS (mpeg2dec->srcpad), obuf);
if (ret != GST_FLOW_OK) {
return ret;
}
/* libmpeg2 needs 16 byte aligned buffers... test for this here
* and if it fails only a single time create our own buffers from
* there on below that are correctly aligned */
if (((uintptr_t) GST_BUFFER_DATA (*obuf)) % 16 == 0) {
GST_LOG_OBJECT (mpeg2dec, "return 16 byte aligned buffer");
return ret;
}
GST_DEBUG_OBJECT (mpeg2dec,
"can't get 16 byte aligned buffers, creating our own ones");
gst_buffer_unref (*obuf);
mpeg2dec->can_allocate_aligned = FALSE;
}
/* can't use gst_pad_alloc_buffer() here because the output buffer will
* either be cropped later or be bigger than expected (for the alignment),
* and basetransform-based elements will complain about the wrong unit size
* when not operating in passthrough mode */
*obuf = gst_buffer_new_and_alloc (size + 15);
GST_BUFFER_DATA (*obuf) = (guint8 *) ALIGN_16 (GST_BUFFER_DATA (*obuf));
GST_BUFFER_SIZE (*obuf) = size;
gst_buffer_set_caps (*obuf, GST_PAD_CAPS (mpeg2dec->srcpad));
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mpeg2dec_alloc_buffer (GstMpeg2dec * mpeg2dec, gint64 offset,
GstBuffer ** obuf)
{
GstBuffer *outbuf = NULL;
guint8 *buf[3];
GstFlowReturn ret = GST_FLOW_OK;
ret = gst_mpeg2dec_alloc_sized_buf (mpeg2dec, mpeg2dec->size, &outbuf);
if (ret != GST_FLOW_OK)
goto no_buffer;
buf[0] = GST_BUFFER_DATA (outbuf);
buf[1] = buf[0] + mpeg2dec->u_offs;
buf[2] = buf[0] + mpeg2dec->v_offs;
GST_DEBUG_OBJECT (mpeg2dec, "set_buf: %p %p %p, outbuf %p",
buf[0], buf[1], buf[2], outbuf);
mpeg2_set_buf (mpeg2dec->decoder, buf, outbuf);
/* we store the original byteoffset of this picture in the stream here
* because we need it for indexing */
GST_BUFFER_OFFSET (outbuf) = offset;
*obuf = outbuf;
return ret;
/* ERRORS */
no_buffer:
{
if (ret != GST_FLOW_WRONG_STATE && ret != GST_FLOW_UNEXPECTED &&
ret != GST_FLOW_NOT_LINKED) {
GST_ELEMENT_ERROR (mpeg2dec, RESOURCE, FAILED, (NULL),
("Failed to allocate memory for buffer, reason %s",
gst_flow_get_name (ret)));
}
GST_DEBUG_OBJECT (mpeg2dec, "no output buffer, reason %s",
gst_flow_get_name (ret));
mpeg2_set_buf (mpeg2dec->decoder, mpeg2dec->dummybuf, NULL);
*obuf = NULL;
return ret;
}
}
static gboolean
gst_mpeg2dec_negotiate_format (GstMpeg2dec * mpeg2dec)
{
GstCaps *caps;
guint32 fourcc;
const mpeg2_info_t *info;
const mpeg2_sequence_t *sequence;
info = mpeg2_info (mpeg2dec->decoder);
sequence = info->sequence;
if (sequence->width != sequence->chroma_width &&
sequence->height != sequence->chroma_height) {
mpeg2dec->format = GST_VIDEO_FORMAT_I420;
} else if ((sequence->width == sequence->chroma_width &&
sequence->height != sequence->chroma_height) ||
(sequence->width != sequence->chroma_width &&
sequence->height == sequence->chroma_height)) {
mpeg2dec->format = GST_VIDEO_FORMAT_Y42B;
} else {
mpeg2dec->format = GST_VIDEO_FORMAT_Y444;
}
fourcc = gst_video_format_to_fourcc (mpeg2dec->format);
mpeg2dec->size = gst_video_format_get_size (mpeg2dec->format,
mpeg2dec->decoded_width, mpeg2dec->decoded_height);
mpeg2dec->u_offs = gst_video_format_get_component_offset (mpeg2dec->format, 1,
mpeg2dec->decoded_width, mpeg2dec->decoded_height);
mpeg2dec->v_offs = gst_video_format_get_component_offset (mpeg2dec->format, 2,
mpeg2dec->decoded_width, mpeg2dec->decoded_height);
if (mpeg2dec->pixel_width == 0 || mpeg2dec->pixel_height == 0) {
GValue par = { 0, };
GValue dar = { 0, };
GValue dimensions = { 0, };
/* assume display aspect ratio (DAR) of 4:3 */
g_value_init (&dar, GST_TYPE_FRACTION);
gst_value_set_fraction (&dar, 4, 3);
g_value_init (&dimensions, GST_TYPE_FRACTION);
gst_value_set_fraction (&dimensions, mpeg2dec->height, mpeg2dec->width);
g_value_init (&par, GST_TYPE_FRACTION);
if (!gst_value_fraction_multiply (&par, &dar, &dimensions)) {
gst_value_set_fraction (&dimensions, 1, 1);
}
mpeg2dec->pixel_width = gst_value_get_fraction_numerator (&par);
mpeg2dec->pixel_height = gst_value_get_fraction_denominator (&par);
GST_WARNING_OBJECT (mpeg2dec, "Unknown pixel-aspect-ratio, assuming %d:%d",
mpeg2dec->pixel_width, mpeg2dec->pixel_height);
g_value_unset (&par);
g_value_unset (&dar);
g_value_unset (&dimensions);
}
caps = gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, fourcc,
"width", G_TYPE_INT, mpeg2dec->width,
"height", G_TYPE_INT, mpeg2dec->height,
"pixel-aspect-ratio", GST_TYPE_FRACTION, mpeg2dec->pixel_width,
mpeg2dec->pixel_height,
"framerate", GST_TYPE_FRACTION, mpeg2dec->fps_n, mpeg2dec->fps_d,
"interlaced", G_TYPE_BOOLEAN, mpeg2dec->interlaced, NULL);
gst_pad_set_caps (mpeg2dec->srcpad, caps);
gst_caps_unref (caps);
return TRUE;
}
static void
init_dummybuf (GstMpeg2dec * mpeg2dec)
{
g_free (mpeg2dec->dummybuf[3]);
/* libmpeg2 needs 16 byte aligned buffers... care for this here */
mpeg2dec->dummybuf[3] = g_malloc0 (mpeg2dec->size + 15);
mpeg2dec->dummybuf[0] = ALIGN_16 (mpeg2dec->dummybuf[3]);
mpeg2dec->dummybuf[1] = mpeg2dec->dummybuf[0] + mpeg2dec->u_offs;
mpeg2dec->dummybuf[2] = mpeg2dec->dummybuf[0] + mpeg2dec->v_offs;
}
static GstFlowReturn
handle_sequence (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
{
GstFlowReturn ret = GST_FLOW_OK;
if (info->sequence->frame_period == 0) {
GST_WARNING_OBJECT (mpeg2dec, "Frame period is 0!");
ret = GST_FLOW_ERROR;
goto done;
}
mpeg2dec->width = info->sequence->picture_width;
mpeg2dec->height = info->sequence->picture_height;
mpeg2dec->decoded_width = info->sequence->width;
mpeg2dec->decoded_height = info->sequence->height;
mpeg2dec->total_frames = 0;
/* don't take the sequence PAR if we already have one from the sink caps */
if (!mpeg2dec->have_par) {
mpeg2dec->pixel_width = info->sequence->pixel_width;
mpeg2dec->pixel_height = info->sequence->pixel_height;
}
/* mpeg2 video can only be from 16x16 to 4096x4096. Everything
* else is a corrupted files */
if (mpeg2dec->width > 4096 || mpeg2dec->width < 16 ||
mpeg2dec->height > 4096 || mpeg2dec->height < 16) {
GST_ERROR_OBJECT (mpeg2dec, "Invalid frame dimensions: %d x %d",
mpeg2dec->width, mpeg2dec->height);
return GST_FLOW_ERROR;
}
/* set framerate */
mpeg2dec->fps_n = 27000000;
mpeg2dec->fps_d = info->sequence->frame_period;
mpeg2dec->frame_period = info->sequence->frame_period * GST_USECOND / 27;
mpeg2dec->interlaced =
!(info->sequence->flags & SEQ_FLAG_PROGRESSIVE_SEQUENCE);
GST_DEBUG_OBJECT (mpeg2dec,
"sequence flags: %d, frame period: %d (%g), frame rate: %d/%d",
info->sequence->flags, info->sequence->frame_period,
(double) (mpeg2dec->frame_period) / GST_SECOND, mpeg2dec->fps_n,
mpeg2dec->fps_d);
GST_DEBUG_OBJECT (mpeg2dec, "profile: %02x, colour_primaries: %d",
info->sequence->profile_level_id, info->sequence->colour_primaries);
GST_DEBUG_OBJECT (mpeg2dec, "transfer chars: %d, matrix coef: %d",
info->sequence->transfer_characteristics,
info->sequence->matrix_coefficients);
GST_DEBUG_OBJECT (mpeg2dec,
"FLAGS: CONSTRAINED_PARAMETERS:%d, PROGRESSIVE_SEQUENCE:%d",
info->sequence->flags & SEQ_FLAG_CONSTRAINED_PARAMETERS,
info->sequence->flags & SEQ_FLAG_PROGRESSIVE_SEQUENCE);
GST_DEBUG_OBJECT (mpeg2dec, "FLAGS: LOW_DELAY:%d, COLOUR_DESCRIPTION:%d",
info->sequence->flags & SEQ_FLAG_LOW_DELAY,
info->sequence->flags & SEQ_FLAG_COLOUR_DESCRIPTION);
if (!gst_mpeg2dec_negotiate_format (mpeg2dec))
goto negotiate_failed;
mpeg2_custom_fbuf (mpeg2dec->decoder, 1);
init_dummybuf (mpeg2dec);
/* Pump in some null buffers, because otherwise libmpeg2 doesn't
* initialise the discard_fbuf->id */
mpeg2_set_buf (mpeg2dec->decoder, mpeg2dec->dummybuf, NULL);
mpeg2_set_buf (mpeg2dec->decoder, mpeg2dec->dummybuf, NULL);
mpeg2_set_buf (mpeg2dec->decoder, mpeg2dec->dummybuf, NULL);
mpeg2dec->need_sequence = FALSE;
done:
return ret;
negotiate_failed:
{
GST_ELEMENT_ERROR (mpeg2dec, CORE, NEGOTIATION, (NULL), (NULL));
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
}
static void
clear_buffers (GstMpeg2dec * mpeg2dec)
{
gint i;
GstBuffer **bufpen;
for (i = 0; i < 4; i++) {
bufpen = &mpeg2dec->ip_buffers[i];
if (*bufpen)
gst_buffer_unref (*bufpen);
*bufpen = NULL;
}
bufpen = &mpeg2dec->b_buffer;
if (*bufpen)
gst_buffer_unref (*bufpen);
*bufpen = NULL;
}
static void
clear_queued (GstMpeg2dec * mpeg2dec)
{
g_list_foreach (mpeg2dec->queued, (GFunc) gst_mini_object_unref, NULL);
g_list_free (mpeg2dec->queued);
mpeg2dec->queued = NULL;
}
static GstFlowReturn
flush_queued (GstMpeg2dec * mpeg2dec)
{
GstFlowReturn res = GST_FLOW_OK;
while (mpeg2dec->queued) {
GstBuffer *buf = GST_BUFFER_CAST (mpeg2dec->queued->data);
GST_LOG_OBJECT (mpeg2dec, "pushing buffer %p, timestamp %"
GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT, buf,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buf)));
/* iterate ouput queue an push downstream */
res = gst_pad_push (mpeg2dec->srcpad, buf);
mpeg2dec->queued = g_list_delete_link (mpeg2dec->queued, mpeg2dec->queued);
}
return res;
}
static GstFlowReturn
handle_picture (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
{
gboolean key_frame = FALSE;
GstBuffer *outbuf, **bufpen;
GstFlowReturn ret;
gint type;
ret = gst_mpeg2dec_alloc_buffer (mpeg2dec, mpeg2dec->offset, &outbuf);
if (ret != GST_FLOW_OK)
goto no_buffer;
if (info->current_picture) {
type = info->current_picture->flags & PIC_MASK_CODING_TYPE;
} else {
type = 0;
}
GST_DEBUG_OBJECT (mpeg2dec, "handle picture type %d", type);
key_frame = type == PIC_FLAG_CODING_TYPE_I;
switch (type) {
case PIC_FLAG_CODING_TYPE_I:
mpeg2_skip (mpeg2dec->decoder, 0);
if (mpeg2dec->segment.rate < 0.0) {
/* negative rate, flush the queued pictures in reverse */
GST_DEBUG_OBJECT (mpeg2dec, "flushing queued buffers");
flush_queued (mpeg2dec);
}
case PIC_FLAG_CODING_TYPE_P:
bufpen = &mpeg2dec->ip_buffers[mpeg2dec->ip_bufpos];
GST_DEBUG_OBJECT (mpeg2dec, "I/P unref %p, ref %p", *bufpen, outbuf);
if (*bufpen)
gst_buffer_unref (*bufpen);
*bufpen = outbuf;
mpeg2dec->ip_bufpos = (mpeg2dec->ip_bufpos + 1) & 3;
break;
case PIC_FLAG_CODING_TYPE_B:
bufpen = &mpeg2dec->b_buffer;
GST_DEBUG_OBJECT (mpeg2dec, "B unref %p, ref %p", *bufpen, outbuf);
if (*bufpen)
gst_buffer_unref (*bufpen);
*bufpen = outbuf;
break;
default:
break;
}
GST_DEBUG_OBJECT (mpeg2dec, "picture %s, outbuf %p, offset %"
G_GINT64_FORMAT,
key_frame ? ", kf," : " ", outbuf, GST_BUFFER_OFFSET (outbuf)
);
if (mpeg2dec->discont_state == MPEG2DEC_DISC_NEW_PICTURE && key_frame) {
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_KEYFRAME;
}
return ret;
no_buffer:
{
return ret;
}
}
/* try to clip the buffer to the segment boundaries */
static gboolean
clip_buffer (GstMpeg2dec * dec, GstBuffer * buf)
{
gboolean res = TRUE;
GstClockTime in_ts, in_dur, stop;
gint64 cstart, cstop;
in_ts = GST_BUFFER_TIMESTAMP (buf);
in_dur = GST_BUFFER_DURATION (buf);
GST_LOG_OBJECT (dec,
"timestamp:%" GST_TIME_FORMAT " , duration:%" GST_TIME_FORMAT,
GST_TIME_ARGS (in_ts), GST_TIME_ARGS (in_dur));
/* can't clip without TIME segment */
if (dec->segment.format != GST_FORMAT_TIME)
goto beach;
/* we need a start time */
if (!GST_CLOCK_TIME_IS_VALID (in_ts))
goto beach;
/* generate valid stop, if duration unknown, we have unknown stop */
stop =
GST_CLOCK_TIME_IS_VALID (in_dur) ? (in_ts + in_dur) : GST_CLOCK_TIME_NONE;
/* now clip */
if (!(res = gst_segment_clip (&dec->segment, GST_FORMAT_TIME,
in_ts, stop, &cstart, &cstop)))
goto beach;
/* update timestamp and possibly duration if the clipped stop time is
* valid */
GST_BUFFER_TIMESTAMP (buf) = cstart;
if (GST_CLOCK_TIME_IS_VALID (cstop))
GST_BUFFER_DURATION (buf) = cstop - cstart;
beach:
GST_LOG_OBJECT (dec, "%sdropping", (res ? "not " : ""));
return res;
}
static GstFlowReturn
handle_slice (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
{
GstBuffer *outbuf = NULL;
GstFlowReturn ret = GST_FLOW_OK;
const mpeg2_picture_t *picture;
gboolean key_frame = FALSE;
GstClockTime time;
GST_DEBUG_OBJECT (mpeg2dec, "picture slice/end %p %p %p %p",
info->display_fbuf,
info->display_picture, info->current_picture,
(info->display_fbuf ? info->display_fbuf->id : NULL));
if (!info->display_fbuf || !info->display_fbuf->id)
goto no_display;
outbuf = GST_BUFFER (info->display_fbuf->id);
picture = info->display_picture;
key_frame = (picture->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_I;
GST_DEBUG_OBJECT (mpeg2dec, "picture flags: %d, type: %d, keyframe: %d",
picture->flags, picture->flags & PIC_MASK_CODING_TYPE, key_frame);
if (key_frame) {
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
mpeg2_skip (mpeg2dec->decoder, 0);
} else {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
}
if (mpeg2dec->discont_state == MPEG2DEC_DISC_NEW_KEYFRAME && key_frame)
mpeg2dec->discont_state = MPEG2DEC_DISC_NONE;
time = GST_CLOCK_TIME_NONE;
#if MPEG2_RELEASE < MPEG2_VERSION(0,4,0)
if (picture->flags & PIC_FLAG_PTS) {
time = MPEG_TIME_TO_GST_TIME (picture->pts);
GST_DEBUG_OBJECT (mpeg2dec, "picture pts %" G_GUINT64_FORMAT
", time %" GST_TIME_FORMAT, picture->pts, GST_TIME_ARGS (time));
}
#else
if (picture->flags & PIC_FLAG_TAGS) {
guint64 pts = (((guint64) picture->tag2) << 32) | picture->tag;
time = MPEG_TIME_TO_GST_TIME (pts);
GST_DEBUG_OBJECT (mpeg2dec, "picture tags %" G_GUINT64_FORMAT
", time %" GST_TIME_FORMAT, pts, GST_TIME_ARGS (time));
}
#endif
if (time == GST_CLOCK_TIME_NONE) {
time = mpeg2dec->next_time;
GST_DEBUG_OBJECT (mpeg2dec, "picture didn't have pts");
} else {
GST_DEBUG_OBJECT (mpeg2dec,
"picture had pts %" GST_TIME_FORMAT ", we had %"
GST_TIME_FORMAT, GST_TIME_ARGS (time),
GST_TIME_ARGS (mpeg2dec->next_time));
mpeg2dec->next_time = time;
}
GST_BUFFER_TIMESTAMP (outbuf) = time;
/* TODO set correct offset here based on frame number */
if (info->display_picture_2nd) {
GST_BUFFER_DURATION (outbuf) = (picture->nb_fields +
info->display_picture_2nd->nb_fields) * mpeg2dec->frame_period / 2;
} else {
GST_BUFFER_DURATION (outbuf) =
picture->nb_fields * mpeg2dec->frame_period / 2;
}
mpeg2dec->next_time += GST_BUFFER_DURATION (outbuf);
if (picture->flags & PIC_FLAG_TOP_FIELD_FIRST)
GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_TFF);
#if MPEG2_RELEASE >= MPEG2_VERSION(0,5,0)
/* repeat field introduced in 0.5.0 */
if (picture->flags & PIC_FLAG_REPEAT_FIRST_FIELD)
GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_RFF);
#endif
GST_DEBUG_OBJECT (mpeg2dec,
"picture: %s %s %s %s %s fields:%d off:%" G_GINT64_FORMAT " ts:%"
GST_TIME_FORMAT,
(picture->flags & PIC_FLAG_PROGRESSIVE_FRAME ? "prog" : " "),
(picture->flags & PIC_FLAG_TOP_FIELD_FIRST ? "tff" : " "),
#if MPEG2_RELEASE >= MPEG2_VERSION(0,5,0)
(picture->flags & PIC_FLAG_REPEAT_FIRST_FIELD ? "rff" : " "),
#else
"unknown rff",
#endif
(picture->flags & PIC_FLAG_SKIP ? "skip" : " "),
(picture->flags & PIC_FLAG_COMPOSITE_DISPLAY ? "composite" : " "),
picture->nb_fields, GST_BUFFER_OFFSET (outbuf),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)));
if (mpeg2dec->index) {
gst_index_add_association (mpeg2dec->index, mpeg2dec->index_id,
(key_frame ? GST_ASSOCIATION_FLAG_KEY_UNIT :
GST_ASSOCIATION_FLAG_DELTA_UNIT),
GST_FORMAT_BYTES, GST_BUFFER_OFFSET (outbuf),
GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (outbuf), 0);
}
if (picture->flags & PIC_FLAG_SKIP)
goto skip;
if (mpeg2dec->discont_state != MPEG2DEC_DISC_NONE)
goto drop;
/* check for clipping */
if (!clip_buffer (mpeg2dec, outbuf))
goto clipped;
if (GST_CLOCK_TIME_IS_VALID (time)) {
gboolean need_skip;
GstClockTime qostime;
/* qos needs to be done on running time */
qostime = gst_segment_to_running_time (&mpeg2dec->segment, GST_FORMAT_TIME,
time);
GST_OBJECT_LOCK (mpeg2dec);
/* check for QoS, don't perform the last steps of getting and
* pushing the buffers that are known to be late. */
/* FIXME, we can also entirely skip decoding if the next valid buffer is
* known to be after a keyframe (using the granule_shift) */
need_skip = mpeg2dec->earliest_time != -1
&& qostime <= mpeg2dec->earliest_time;
GST_OBJECT_UNLOCK (mpeg2dec);
if (need_skip)
goto dropping_qos;
}
/* ref before pushing it out, so we still have the ref in our
* array of buffers */
gst_buffer_ref (outbuf);
/* do cropping if the target region is smaller than the input one */
if (mpeg2dec->decoded_width != mpeg2dec->width ||
mpeg2dec->decoded_height != mpeg2dec->height) {
GST_DEBUG_OBJECT (mpeg2dec, "cropping buffer");
ret = gst_mpeg2dec_crop_buffer (mpeg2dec, &outbuf);
if (ret != GST_FLOW_OK)
goto done;
}
if (mpeg2dec->segment.rate >= 0.0) {
/* forward: push right away */
GST_LOG_OBJECT (mpeg2dec, "pushing buffer %p, timestamp %"
GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
outbuf,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)));
GST_LOG_OBJECT (mpeg2dec, "... with flags %x", GST_BUFFER_FLAGS (outbuf));
ret = gst_pad_push (mpeg2dec->srcpad, outbuf);
GST_DEBUG_OBJECT (mpeg2dec, "pushed with result %s",
gst_flow_get_name (ret));
} else {
/* reverse: queue, we'll push in reverse when we receive the next (previous)
* keyframe. */
GST_DEBUG_OBJECT (mpeg2dec, "queued frame");
mpeg2dec->queued = g_list_prepend (mpeg2dec->queued, outbuf);
ret = GST_FLOW_OK;
}
done:
return ret;
/* special cases */
no_display:
{
GST_DEBUG_OBJECT (mpeg2dec, "no picture to display");
return GST_FLOW_OK;
}
skip:
{
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer because of skip flag");
return GST_FLOW_OK;
}
drop:
{
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer, discont state %d",
mpeg2dec->discont_state);
return GST_FLOW_OK;
}
clipped:
{
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer, clipped");
return GST_FLOW_OK;
}
dropping_qos:
{
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer because of QoS");
return GST_FLOW_OK;
}
}
#if 0
static void
update_streaminfo (GstMpeg2dec * mpeg2dec)
{
GstCaps *caps;
GstProps *props;
GstPropsEntry *entry;
const mpeg2_info_t *info;
info = mpeg2_info (mpeg2dec->decoder);
props = gst_props_empty_new ();
entry =
gst_props_entry_new ("framerate",
G_TYPE_DOUBLE (GST_SECOND / (float) mpeg2dec->frame_period));
gst_props_add_entry (props, entry);
entry =
gst_props_entry_new ("bitrate",
G_TYPE_INT (info->sequence->byte_rate * 8));
gst_props_add_entry (props, entry);
caps = gst_caps_new ("mpeg2dec_streaminfo",
"application/x-gst-streaminfo", props);
gst_caps_replace_sink (&mpeg2dec->streaminfo, caps);
g_object_notify (G_OBJECT (mpeg2dec), "streaminfo");
}
#endif
static GstFlowReturn
gst_mpeg2dec_chain (GstPad * pad, GstBuffer * buf)
{
GstMpeg2dec *mpeg2dec;
guint32 size;
guint8 *data, *end;
GstClockTime pts;
const mpeg2_info_t *info;
mpeg2_state_t state;
gboolean done = FALSE;
GstFlowReturn ret = GST_FLOW_OK;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
size = GST_BUFFER_SIZE (buf);
data = GST_BUFFER_DATA (buf);
pts = GST_BUFFER_TIMESTAMP (buf);
if (GST_BUFFER_IS_DISCONT (buf)) {
GST_LOG_OBJECT (mpeg2dec, "DISCONT, reset decoder");
/* when we receive a discont, reset our state as to not create too much
* distortion in the picture due to missing packets */
mpeg2_reset (mpeg2dec->decoder, 0);
mpeg2_skip (mpeg2dec->decoder, 1);
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
}
GST_LOG_OBJECT (mpeg2dec, "received buffer, timestamp %"
GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buf)));
info = mpeg2dec->info;
end = data + size;
mpeg2dec->offset = GST_BUFFER_OFFSET (buf);
if (pts != GST_CLOCK_TIME_NONE) {
gint64 mpeg_pts = GST_TIME_TO_MPEG_TIME (pts);
GST_DEBUG_OBJECT (mpeg2dec,
"have pts: %" G_GINT64_FORMAT " (%" GST_TIME_FORMAT ")",
mpeg_pts, GST_TIME_ARGS (MPEG_TIME_TO_GST_TIME (mpeg_pts)));
#if MPEG2_RELEASE >= MPEG2_VERSION(0,4,0)
mpeg2_tag_picture (mpeg2dec->decoder, mpeg_pts & 0xffffffff,
mpeg_pts >> 32);
#else
mpeg2_pts (mpeg2dec->decoder, mpeg_pts);
#endif
} else {
GST_LOG ("no pts");
}
GST_LOG_OBJECT (mpeg2dec, "calling mpeg2_buffer");
mpeg2_buffer (mpeg2dec->decoder, data, end);
GST_LOG_OBJECT (mpeg2dec, "calling mpeg2_buffer done");
while (!done) {
GST_LOG_OBJECT (mpeg2dec, "calling parse");
state = mpeg2_parse (mpeg2dec->decoder);
GST_DEBUG_OBJECT (mpeg2dec, "parse state %d", state);
switch (state) {
#if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
case STATE_SEQUENCE_MODIFIED:
GST_DEBUG_OBJECT (mpeg2dec, "sequence modified");
/* fall through */
#endif
case STATE_SEQUENCE:
ret = handle_sequence (mpeg2dec, info);
/* if there is an error handling the sequence
* reset the decoder, maybe something more elegant
* could be done.
*/
if (ret == GST_FLOW_ERROR) {
mpeg2dec->error_count++;
GST_WARNING_OBJECT (mpeg2dec, "Decoding error #%d",
mpeg2dec->error_count);
if (mpeg2dec->error_count >= WARN_THRESHOLD && WARN_THRESHOLD > 0) {
GST_ELEMENT_WARNING (mpeg2dec, STREAM, DECODE,
("%d consecutive decoding errors", mpeg2dec->error_count),
(NULL));
}
mpeg2_reset (mpeg2dec->decoder, 0);
mpeg2_skip (mpeg2dec->decoder, 1);
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
goto exit;
}
break;
case STATE_SEQUENCE_REPEATED:
GST_DEBUG_OBJECT (mpeg2dec, "sequence repeated");
break;
case STATE_GOP:
GST_DEBUG_OBJECT (mpeg2dec, "gop");
break;
case STATE_PICTURE:
ret = handle_picture (mpeg2dec, info);
break;
case STATE_SLICE_1ST:
GST_LOG_OBJECT (mpeg2dec, "1st slice of frame encountered");
break;
case STATE_PICTURE_2ND:
GST_LOG_OBJECT (mpeg2dec,
"Second picture header encountered. Decoding 2nd field");
break;
#if MPEG2_RELEASE >= MPEG2_VERSION (0, 4, 0)
case STATE_INVALID_END:
GST_DEBUG_OBJECT (mpeg2dec, "invalid end");
#endif
case STATE_END:
GST_DEBUG_OBJECT (mpeg2dec, "end");
mpeg2dec->need_sequence = TRUE;
case STATE_SLICE:
ret = handle_slice (mpeg2dec, info);
break;
case STATE_BUFFER:
done = TRUE;
break;
/* error */
case STATE_INVALID:
/* FIXME: at some point we should probably send newsegment events to
* let downstream know that parts of the stream are missing */
mpeg2dec->error_count++;
GST_WARNING_OBJECT (mpeg2dec, "Decoding error #%d",
mpeg2dec->error_count);
if (mpeg2dec->error_count >= WARN_THRESHOLD && WARN_THRESHOLD > 0) {
GST_ELEMENT_WARNING (mpeg2dec, STREAM, DECODE,
("%d consecutive decoding errors", mpeg2dec->error_count),
(NULL));
}
continue;
default:
GST_ERROR_OBJECT (mpeg2dec, "Unknown libmpeg2 state %d, FIXME", state);
goto exit;
}
mpeg2dec->error_count = 0;
/*
* FIXME: should pass more information such as state the user data is from
*/
#ifdef enable_user_data
if (info->user_data_len > 0) {
GstBuffer *udbuf = gst_buffer_new_and_alloc (info->user_data_len);
memcpy (GST_BUFFER_DATA (udbuf), info->user_data, info->user_data_len);
gst_pad_push (mpeg2dec->userdatapad, udbuf);
}
#endif
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (mpeg2dec, "exit loop, reason %s",
gst_flow_get_name (ret));
break;
}
}
done:
gst_buffer_unref (buf);
return ret;
/* errors */
exit:
{
ret = GST_FLOW_OK;
goto done;
}
}
static gboolean
gst_mpeg2dec_sink_event (GstPad * pad, GstEvent * event)
{
GstMpeg2dec *mpeg2dec;
gboolean ret = TRUE;
mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (mpeg2dec, "Got %s event on sink pad",
GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
gboolean update;
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
/* we need TIME and a positive rate */
if (format != GST_FORMAT_TIME)
goto newseg_wrong_format;
/* now configure the values */
gst_segment_set_newsegment_full (&mpeg2dec->segment, update,
rate, arate, format, start, stop, time);
GST_DEBUG_OBJECT (mpeg2dec,
"Pushing newseg rate %g, applied rate %g, format %d, start %"
G_GINT64_FORMAT ", stop %" G_GINT64_FORMAT ", pos %" G_GINT64_FORMAT,
rate, arate, format, start, stop, time);
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
}
case GST_EVENT_FLUSH_START:
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
{
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
mpeg2dec->next_time = -1;;
gst_mpeg2dec_qos_reset (mpeg2dec);
mpeg2_reset (mpeg2dec->decoder, 0);
mpeg2_skip (mpeg2dec->decoder, 1);
clear_queued (mpeg2dec);
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
}
case GST_EVENT_EOS:
if (mpeg2dec->index && mpeg2dec->closed) {
gst_index_commit (mpeg2dec->index, mpeg2dec->index_id);
}
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
default:
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
}
done:
gst_object_unref (mpeg2dec);
return ret;
/* ERRORS */
newseg_wrong_format:
{
GST_DEBUG_OBJECT (mpeg2dec, "received non TIME newsegment");
gst_event_unref (event);
goto done;
}
}
static gboolean
gst_mpeg2dec_setcaps (GstPad * pad, GstCaps * caps)
{
GstMpeg2dec *mpeg2dec;
GstStructure *s;
mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
s = gst_caps_get_structure (caps, 0);
/* parse the par, this overrides the encoded par */
mpeg2dec->have_par = gst_structure_get_fraction (s, "pixel-aspect-ratio",
&mpeg2dec->pixel_width, &mpeg2dec->pixel_height);
gst_object_unref (mpeg2dec);
return TRUE;
}
static gboolean
gst_mpeg2dec_sink_convert (GstPad * pad, GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
GstMpeg2dec *mpeg2dec;
const mpeg2_info_t *info;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
if (mpeg2dec->decoder == NULL)
return FALSE;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
info = mpeg2_info (mpeg2dec->decoder);
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
if (info->sequence && info->sequence->byte_rate) {
*dest_value =
gst_util_uint64_scale (GST_SECOND, src_value,
info->sequence->byte_rate);
GST_WARNING_OBJECT (mpeg2dec, "dest_value:%" GST_TIME_FORMAT,
GST_TIME_ARGS (*dest_value));
break;
} else if (info->sequence)
GST_WARNING_OBJECT (mpeg2dec,
"Cannot convert from BYTES to TIME since we don't know the bitrate at this point.");
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
if (info->sequence && info->sequence->byte_rate) {
*dest_value =
gst_util_uint64_scale_int (src_value, info->sequence->byte_rate,
GST_SECOND);
break;
} else if (info->sequence)
GST_WARNING_OBJECT (mpeg2dec,
"Cannot convert from TIME to BYTES since we don't know the bitrate at this point.");
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
return res;
}
static gboolean
gst_mpeg2dec_src_convert (GstPad * pad, GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
GstMpeg2dec *mpeg2dec;
const mpeg2_info_t *info;
guint64 scale = 1;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
if (mpeg2dec->decoder == NULL)
return FALSE;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
info = mpeg2_info (mpeg2dec->decoder);
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
scale = 6 * (mpeg2dec->width * mpeg2dec->height >> 2);
case GST_FORMAT_DEFAULT:
if (info->sequence && mpeg2dec->frame_period) {
*dest_value =
gst_util_uint64_scale_int (src_value, scale,
mpeg2dec->frame_period);
break;
}
default:
res = FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = src_value * mpeg2dec->frame_period;
break;
case GST_FORMAT_BYTES:
*dest_value =
src_value * 6 * ((mpeg2dec->width * mpeg2dec->height) >> 2);
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
return res;
}
static const GstQueryType *
gst_mpeg2dec_get_src_query_types (GstPad * pad)
{
static const GstQueryType types[] = {
GST_QUERY_POSITION,
GST_QUERY_DURATION,
0
};
return types;
}
static gboolean
gst_mpeg2dec_src_query (GstPad * pad, GstQuery * query)
{
gboolean res = TRUE;
GstMpeg2dec *mpeg2dec;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
gint64 cur;
/* First, we try to ask upstream, which might know better, especially in
* the case of DVDs, with multiple chapter */
if ((res = gst_pad_peer_query (mpeg2dec->sinkpad, query)))
break;
/* save requested format */
gst_query_parse_position (query, &format, NULL);
/* and convert to the requested format */
if (!gst_mpeg2dec_src_convert (pad, GST_FORMAT_TIME,
mpeg2dec->next_time, &format, &cur))
goto error;
cur = gst_segment_to_stream_time (&mpeg2dec->segment, format, cur);
if (cur == -1)
goto error;
gst_query_set_position (query, format, cur);
GST_LOG_OBJECT (mpeg2dec,
"position query: we return %" G_GUINT64_FORMAT " (format %u)", cur,
format);
break;
}
case GST_QUERY_DURATION:
{
GstFormat format;
GstFormat rformat;
gint64 total, total_bytes;
GstPad *peer;
if ((peer = gst_pad_get_peer (mpeg2dec->sinkpad)) == NULL)
goto error;
/* save requested format */
gst_query_parse_duration (query, &format, NULL);
/* send to peer */
if ((res = gst_pad_query (peer, query))) {
gst_object_unref (peer);
goto done;
} else {
GST_LOG_OBJECT (mpeg2dec, "query on peer pad failed, trying bytes");
}
/* query peer for total length in bytes */
gst_query_set_duration (query, GST_FORMAT_BYTES, -1);
if (!(res = gst_pad_query (peer, query))) {
GST_LOG_OBJECT (mpeg2dec, "query on peer pad failed");
gst_object_unref (peer);
goto error;
}
gst_object_unref (peer);
/* get the returned format */
gst_query_parse_duration (query, &rformat, &total_bytes);
GST_LOG_OBJECT (mpeg2dec,
"peer pad returned total=%" G_GINT64_FORMAT " bytes", total_bytes);
if (total_bytes != -1) {
if (!gst_mpeg2dec_sink_convert (pad, GST_FORMAT_BYTES, total_bytes,
&format, &total))
goto error;
} else {
total = -1;
}
gst_query_set_duration (query, format, total);
GST_LOG_OBJECT (mpeg2dec,
"position query: we return %" G_GUINT64_FORMAT " (format %u)", total,
format);
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
done:
return res;
error:
GST_DEBUG ("error handling query");
return FALSE;
}
#if 0
static const GstEventMask *
gst_mpeg2dec_get_event_masks (GstPad * pad)
{
static const GstEventMask masks[] = {
{GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_FLUSH},
{GST_EVENT_NAVIGATION, GST_EVENT_FLAG_NONE},
{0,}
};
return masks;
}
#endif
static gboolean
index_seek (GstPad * pad, GstEvent * event)
{
GstIndexEntry *entry;
GstMpeg2dec *mpeg2dec;
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
entry = gst_index_get_assoc_entry (mpeg2dec->index, mpeg2dec->index_id,
GST_INDEX_LOOKUP_BEFORE, GST_ASSOCIATION_FLAG_KEY_UNIT, format, cur);
if ((entry) && gst_pad_is_linked (mpeg2dec->sinkpad)) {
const GstFormat *peer_formats, *try_formats;
/* since we know the exact byteoffset of the frame, make sure to seek on bytes first */
const GstFormat try_all_formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
0
};
try_formats = try_all_formats;
#if 0
peer_formats = gst_pad_get_formats (GST_PAD_PEER (mpeg2dec->sinkpad));
#else
peer_formats = try_all_formats; /* FIXE ME */
#endif
while (gst_formats_contains (peer_formats, *try_formats)) {
gint64 value;
if (gst_index_entry_assoc_map (entry, *try_formats, &value)) {
GstEvent *seek_event;
GST_DEBUG_OBJECT (mpeg2dec, "index %s %" G_GINT64_FORMAT
" -> %s %" G_GINT64_FORMAT,
gst_format_get_details (format)->nick,
cur, gst_format_get_details (*try_formats)->nick, value);
/* lookup succeeded, create the seek */
seek_event =
gst_event_new_seek (rate, *try_formats, flags, cur_type, value,
stop_type, stop);
/* do the seek */
if (gst_pad_push_event (mpeg2dec->sinkpad, seek_event)) {
/* seek worked, we're done, loop will exit */
#if 0
mpeg2dec->segment_start = GST_EVENT_SEEK_OFFSET (event);
#endif
return TRUE;
}
}
try_formats++;
}
}
return FALSE;
}
static gboolean
normal_seek (GstPad * pad, GstEvent * event)
{
gdouble rate;
GstFormat format, conv;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gint64 time_cur, bytes_cur;
gint64 time_stop, bytes_stop;
gboolean res;
GstMpeg2dec *mpeg2dec;
GstEvent *peer_event;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
GST_DEBUG ("normal seek");
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
conv = GST_FORMAT_TIME;
if (!gst_mpeg2dec_src_convert (pad, format, cur, &conv, &time_cur))
goto convert_failed;
if (!gst_mpeg2dec_src_convert (pad, format, stop, &conv, &time_stop))
goto convert_failed;
GST_DEBUG ("seek to time %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT,
GST_TIME_ARGS (time_cur), GST_TIME_ARGS (time_stop));
peer_event = gst_event_new_seek (rate, GST_FORMAT_TIME, flags,
cur_type, time_cur, stop_type, time_stop);
/* try seek on time then */
if ((res = gst_pad_push_event (mpeg2dec->sinkpad, peer_event)))
goto done;
/* else we try to seek on bytes */
conv = GST_FORMAT_BYTES;
if (!gst_mpeg2dec_sink_convert (pad, GST_FORMAT_TIME, time_cur,
&conv, &bytes_cur))
goto convert_failed;
if (!gst_mpeg2dec_sink_convert (pad, GST_FORMAT_TIME, time_stop,
&conv, &bytes_stop))
goto convert_failed;
/* conversion succeeded, create the seek */
peer_event =
gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
cur_type, bytes_cur, stop_type, bytes_stop);
/* do the seek */
res = gst_pad_push_event (mpeg2dec->sinkpad, peer_event);
done:
return res;
/* ERRORS */
convert_failed:
{
/* probably unsupported seek format */
GST_DEBUG_OBJECT (mpeg2dec,
"failed to convert format %u into GST_FORMAT_TIME", format);
return FALSE;
}
}
static gboolean
gst_mpeg2dec_src_event (GstPad * pad, GstEvent * event)
{
gboolean res;
GstMpeg2dec *mpeg2dec;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
if (mpeg2dec->decoder == NULL)
goto no_decoder;
switch (GST_EVENT_TYPE (event)) {
/* the all-formats seek logic */
case GST_EVENT_SEEK:{
gst_event_ref (event);
if (!(res = gst_pad_push_event (mpeg2dec->sinkpad, event))) {
if (mpeg2dec->index)
res = index_seek (pad, event);
else
res = normal_seek (pad, event);
}
gst_event_unref (event);
break;
}
case GST_EVENT_QOS:
{
gdouble proportion;
GstClockTimeDiff diff;
GstClockTime timestamp;
gst_event_parse_qos (event, &proportion, &diff, &timestamp);
GST_OBJECT_LOCK (mpeg2dec);
mpeg2dec->proportion = proportion;
mpeg2dec->earliest_time = timestamp + diff;
GST_OBJECT_UNLOCK (mpeg2dec);
GST_DEBUG_OBJECT (mpeg2dec,
"got QoS %" GST_TIME_FORMAT ", %" G_GINT64_FORMAT,
GST_TIME_ARGS (timestamp), diff);
res = gst_pad_push_event (mpeg2dec->sinkpad, event);
break;
}
case GST_EVENT_NAVIGATION:
/* Forward a navigation event unchanged */
default:
res = gst_pad_push_event (mpeg2dec->sinkpad, event);
break;
}
return res;
no_decoder:
{
GST_DEBUG_OBJECT (mpeg2dec, "no decoder, cannot handle event");
gst_event_unref (event);
return FALSE;
}
}
static GstStateChangeReturn
gst_mpeg2dec_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
mpeg2_accel (MPEG2_ACCEL_DETECT);
if ((mpeg2dec->decoder = mpeg2_init ()) == NULL)
goto init_failed;
mpeg2dec->info = mpeg2_info (mpeg2dec->decoder);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_mpeg2dec_reset (mpeg2dec);
gst_mpeg2dec_qos_reset (mpeg2dec);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_mpeg2dec_qos_reset (mpeg2dec);
clear_queued (mpeg2dec);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
if (mpeg2dec->decoder) {
mpeg2_close (mpeg2dec->decoder);
mpeg2dec->decoder = NULL;
mpeg2dec->info = NULL;
}
clear_buffers (mpeg2dec);
break;
default:
break;
}
return ret;
/* ERRORS */
init_failed:
{
GST_ELEMENT_ERROR (mpeg2dec, LIBRARY, INIT,
(NULL), ("Failed to initialize libmpeg2 library"));
return GST_STATE_CHANGE_FAILURE;
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "mpeg2dec", GST_RANK_PRIMARY,
GST_TYPE_MPEG2DEC))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"mpeg2dec",
"LibMpeg2 decoder", plugin_init, VERSION, "GPL", GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN);
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