/* GStreamer * Copyright (C) <1999> Erik Walthinsen * <2005> Wim Taymans * * 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 #include #include #include "gstdvdemux.h" #include "gstsmptetimecode.h" /** * SECTION:element-dvdemux * * dvdemux splits raw DV into its audio and video components. The audio will be * decoded raw samples and the video will be encoded DV video. * * This element can operate in both push and pull mode depending on the * capabilities of the upstream peer. * * * Example launch line * |[ * gst-launch-1.0 filesrc location=test.dv ! dvdemux name=demux ! queue ! audioconvert ! alsasink demux. ! queue ! dvdec ! xvimagesink * ]| This pipeline decodes and renders the raw DV stream to an audio and a videosink. * * * Last reviewed on 2006-02-27 (0.10.3) */ /* DV output has two modes, normal and wide. The resolution is the same in both * cases: 720 pixels wide by 576 pixels tall in PAL format, and 720x480 for * NTSC. * * Each of the modes has its own pixel aspect ratio, which is fixed in practice * by ITU-R BT.601 (also known as "CCIR-601" or "Rec.601"). Or so claims a * reference that I culled from the reliable "internet", * http://www.mir.com/DMG/aspect.html. Normal PAL is 59/54 and normal NTSC is * 10/11. Because the pixel resolution is the same for both cases, we can get * the pixel aspect ratio for wide recordings by multiplying by the ratio of * display aspect ratios, 16/9 (for wide) divided by 4/3 (for normal): * * Wide NTSC: 10/11 * (16/9)/(4/3) = 40/33 * Wide PAL: 59/54 * (16/9)/(4/3) = 118/81 * * However, the pixel resolution coming out of a DV source does not combine with * the standard pixel aspect ratios to give a proper display aspect ratio. An * image 480 pixels tall, with a 4:3 display aspect ratio, will be 768 pixels * wide. But, if we take the normal PAL aspect ratio of 59/54, and multiply it * with the width of the DV image (720 pixels), we get 786.666..., which is * nonintegral and too wide. The camera is not outputting a 4:3 image. * * If the video sink for this stream has fixed dimensions (such as for * fullscreen playback, or for a java applet in a web page), you then have two * choices. Either you show the whole image, but pad the image with black * borders on the top and bottom (like watching a widescreen video on a 4:3 * device), or you crop the video to the proper ratio. Apparently the latter is * the standard practice. * * For its part, GStreamer is concerned with accuracy and preservation of * information. This element outputs the 720x576 or 720x480 video that it * recieves, noting the proper aspect ratio. This should not be a problem for * windowed applications, which can change size to fit the video. Applications * with fixed size requirements should decide whether to crop or pad which * an element such as videobox can do. */ #define NTSC_HEIGHT 480 #define NTSC_BUFFER 120000 #define NTSC_FRAMERATE_NUMERATOR 30000 #define NTSC_FRAMERATE_DENOMINATOR 1001 #define PAL_HEIGHT 576 #define PAL_BUFFER 144000 #define PAL_FRAMERATE_NUMERATOR 25 #define PAL_FRAMERATE_DENOMINATOR 1 #define PAL_NORMAL_PAR_X 59 #define PAL_NORMAL_PAR_Y 54 #define PAL_WIDE_PAR_X 118 #define PAL_WIDE_PAR_Y 81 #define NTSC_NORMAL_PAR_X 10 #define NTSC_NORMAL_PAR_Y 11 #define NTSC_WIDE_PAR_X 40 #define NTSC_WIDE_PAR_Y 33 GST_DEBUG_CATEGORY_STATIC (dvdemux_debug); #define GST_CAT_DEFAULT dvdemux_debug static GstStaticPadTemplate sink_temp = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-dv, systemstream = (boolean) true") ); static GstStaticPadTemplate video_src_temp = GST_STATIC_PAD_TEMPLATE ("video", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS ("video/x-dv, systemstream = (boolean) false") ); static GstStaticPadTemplate audio_src_temp = GST_STATIC_PAD_TEMPLATE ("audio", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS ("audio/x-raw, " "format = (string) " GST_AUDIO_NE (S16) ", " "layout = (string) interleaved, " "rate = (int) { 32000, 44100, 48000 }, " "channels = (int) {2, 4}") ); #define gst_dvdemux_parent_class parent_class G_DEFINE_TYPE (GstDVDemux, gst_dvdemux, GST_TYPE_ELEMENT); static void gst_dvdemux_finalize (GObject * object); /* query functions */ static gboolean gst_dvdemux_src_query (GstPad * pad, GstObject * parent, GstQuery * query); static gboolean gst_dvdemux_sink_query (GstPad * pad, GstObject * parent, GstQuery * query); /* convert functions */ static gboolean gst_dvdemux_sink_convert (GstDVDemux * demux, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value); static gboolean gst_dvdemux_src_convert (GstDVDemux * demux, GstPad * pad, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value); /* event functions */ static gboolean gst_dvdemux_send_event (GstElement * element, GstEvent * event); static gboolean gst_dvdemux_handle_src_event (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_dvdemux_handle_sink_event (GstPad * pad, GstObject * parent, GstEvent * event); /* scheduling functions */ static void gst_dvdemux_loop (GstPad * pad); static GstFlowReturn gst_dvdemux_flush (GstDVDemux * dvdemux); static GstFlowReturn gst_dvdemux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer); /* state change functions */ static gboolean gst_dvdemux_sink_activate (GstPad * sinkpad, GstObject * parent); static gboolean gst_dvdemux_sink_activate_mode (GstPad * sinkpad, GstObject * parent, GstPadMode mode, gboolean active); static GstStateChangeReturn gst_dvdemux_change_state (GstElement * element, GstStateChange transition); static void gst_dvdemux_class_init (GstDVDemuxClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gobject_class->finalize = gst_dvdemux_finalize; gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_dvdemux_change_state); gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_dvdemux_send_event); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&sink_temp)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&video_src_temp)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&audio_src_temp)); gst_element_class_set_static_metadata (gstelement_class, "DV system stream demuxer", "Codec/Demuxer", "Uses libdv to separate DV audio from DV video (libdv.sourceforge.net)", "Erik Walthinsen , Wim Taymans "); GST_DEBUG_CATEGORY_INIT (dvdemux_debug, "dvdemux", 0, "DV demuxer element"); } static void gst_dvdemux_init (GstDVDemux * dvdemux) { gint i; dvdemux->sinkpad = gst_pad_new_from_static_template (&sink_temp, "sink"); /* we can operate in pull and push mode so we install * a custom activate function */ gst_pad_set_activate_function (dvdemux->sinkpad, GST_DEBUG_FUNCPTR (gst_dvdemux_sink_activate)); /* the function to activate in push mode */ gst_pad_set_activatemode_function (dvdemux->sinkpad, GST_DEBUG_FUNCPTR (gst_dvdemux_sink_activate_mode)); /* for push mode, this is the chain function */ gst_pad_set_chain_function (dvdemux->sinkpad, GST_DEBUG_FUNCPTR (gst_dvdemux_chain)); /* handling events (in push mode only) */ gst_pad_set_event_function (dvdemux->sinkpad, GST_DEBUG_FUNCPTR (gst_dvdemux_handle_sink_event)); /* query functions */ gst_pad_set_query_function (dvdemux->sinkpad, GST_DEBUG_FUNCPTR (gst_dvdemux_sink_query)); /* now add the pad */ gst_element_add_pad (GST_ELEMENT (dvdemux), dvdemux->sinkpad); dvdemux->adapter = gst_adapter_new (); /* we need 4 temp buffers for audio decoding which are of a static * size and which we can allocate here */ for (i = 0; i < 4; i++) { dvdemux->audio_buffers[i] = (gint16 *) g_malloc (DV_AUDIO_MAX_SAMPLES * sizeof (gint16)); } } static void gst_dvdemux_finalize (GObject * object) { GstDVDemux *dvdemux; gint i; dvdemux = GST_DVDEMUX (object); g_object_unref (dvdemux->adapter); /* clean up temp audio buffers */ for (i = 0; i < 4; i++) { g_free (dvdemux->audio_buffers[i]); } G_OBJECT_CLASS (parent_class)->finalize (object); } /* reset to default values before starting streaming */ static void gst_dvdemux_reset (GstDVDemux * dvdemux) { dvdemux->frame_offset = 0; dvdemux->audio_offset = 0; dvdemux->video_offset = 0; dvdemux->framecount = 0; g_atomic_int_set (&dvdemux->found_header, 0); dvdemux->frame_len = -1; dvdemux->need_segment = FALSE; dvdemux->new_media = FALSE; dvdemux->framerate_numerator = 0; dvdemux->framerate_denominator = 0; dvdemux->height = 0; dvdemux->frequency = 0; dvdemux->channels = 0; dvdemux->wide = FALSE; gst_segment_init (&dvdemux->byte_segment, GST_FORMAT_BYTES); gst_segment_init (&dvdemux->time_segment, GST_FORMAT_TIME); } static GstPad * gst_dvdemux_add_pad (GstDVDemux * dvdemux, GstStaticPadTemplate * template) { gboolean no_more_pads; GstPad *pad; pad = gst_pad_new_from_static_template (template, template->name_template); gst_pad_set_query_function (pad, GST_DEBUG_FUNCPTR (gst_dvdemux_src_query)); gst_pad_set_event_function (pad, GST_DEBUG_FUNCPTR (gst_dvdemux_handle_src_event)); gst_pad_use_fixed_caps (pad); gst_pad_set_active (pad, TRUE); gst_element_add_pad (GST_ELEMENT (dvdemux), pad); no_more_pads = (dvdemux->videosrcpad != NULL && template == &audio_src_temp) || (dvdemux->audiosrcpad != NULL && template == &video_src_temp); if (no_more_pads) gst_element_no_more_pads (GST_ELEMENT (dvdemux)); gst_pad_push_event (pad, gst_event_new_segment (&dvdemux->time_segment)); if (no_more_pads) { GstTagList *tags; tags = gst_tag_list_new (GST_TAG_CONTAINER_FORMAT, "DV", NULL); gst_tag_list_set_scope (tags, GST_TAG_SCOPE_GLOBAL); gst_pad_push_event (pad, gst_event_new_tag (tags)); } return pad; } static void gst_dvdemux_remove_pads (GstDVDemux * dvdemux) { if (dvdemux->videosrcpad) { gst_element_remove_pad (GST_ELEMENT (dvdemux), dvdemux->videosrcpad); dvdemux->videosrcpad = NULL; } if (dvdemux->audiosrcpad) { gst_element_remove_pad (GST_ELEMENT (dvdemux), dvdemux->audiosrcpad); dvdemux->audiosrcpad = NULL; } } static gboolean gst_dvdemux_src_convert (GstDVDemux * dvdemux, GstPad * pad, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value) { gboolean res = TRUE; if (*dest_format == src_format || src_value == -1) { *dest_value = src_value; goto done; } if (dvdemux->frame_len <= 0) goto error; if (dvdemux->decoder == NULL) goto error; GST_INFO_OBJECT (pad, "src_value:%" G_GINT64_FORMAT ", src_format:%d, dest_format:%d", src_value, src_format, *dest_format); switch (src_format) { case GST_FORMAT_BYTES: switch (*dest_format) { case GST_FORMAT_DEFAULT: if (pad == dvdemux->videosrcpad) *dest_value = src_value / dvdemux->frame_len; else if (pad == dvdemux->audiosrcpad) *dest_value = src_value / (2 * dvdemux->channels); break; case GST_FORMAT_TIME: *dest_format = GST_FORMAT_TIME; if (pad == dvdemux->videosrcpad) *dest_value = gst_util_uint64_scale (src_value, GST_SECOND * dvdemux->framerate_denominator, dvdemux->frame_len * dvdemux->framerate_numerator); else if (pad == dvdemux->audiosrcpad) *dest_value = gst_util_uint64_scale_int (src_value, GST_SECOND, 2 * dvdemux->frequency * dvdemux->channels); break; default: res = FALSE; } break; case GST_FORMAT_TIME: switch (*dest_format) { case GST_FORMAT_BYTES: if (pad == dvdemux->videosrcpad) *dest_value = gst_util_uint64_scale (src_value, dvdemux->frame_len * dvdemux->framerate_numerator, dvdemux->framerate_denominator * GST_SECOND); else if (pad == dvdemux->audiosrcpad) *dest_value = gst_util_uint64_scale_int (src_value, 2 * dvdemux->frequency * dvdemux->channels, GST_SECOND); break; case GST_FORMAT_DEFAULT: if (pad == dvdemux->videosrcpad) { if (src_value) *dest_value = gst_util_uint64_scale (src_value, dvdemux->framerate_numerator, dvdemux->framerate_denominator * GST_SECOND); else *dest_value = 0; } else if (pad == dvdemux->audiosrcpad) { *dest_value = gst_util_uint64_scale (src_value, dvdemux->frequency, GST_SECOND); } break; default: res = FALSE; } break; case GST_FORMAT_DEFAULT: switch (*dest_format) { case GST_FORMAT_TIME: if (pad == dvdemux->videosrcpad) { *dest_value = gst_util_uint64_scale (src_value, GST_SECOND * dvdemux->framerate_denominator, dvdemux->framerate_numerator); } else if (pad == dvdemux->audiosrcpad) { if (src_value) *dest_value = gst_util_uint64_scale (src_value, GST_SECOND, dvdemux->frequency); else *dest_value = 0; } break; case GST_FORMAT_BYTES: if (pad == dvdemux->videosrcpad) { *dest_value = src_value * dvdemux->frame_len; } else if (pad == dvdemux->audiosrcpad) { *dest_value = src_value * 2 * dvdemux->channels; } break; default: res = FALSE; } break; default: res = FALSE; } done: GST_INFO_OBJECT (pad, "Result : dest_format:%d, dest_value:%" G_GINT64_FORMAT ", res:%d", *dest_format, *dest_value, res); return res; /* ERRORS */ error: { GST_INFO ("source conversion failed"); return FALSE; } } static gboolean gst_dvdemux_sink_convert (GstDVDemux * dvdemux, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value) { gboolean res = TRUE; GST_DEBUG_OBJECT (dvdemux, "%d -> %d", src_format, *dest_format); GST_INFO_OBJECT (dvdemux, "src_value:%" G_GINT64_FORMAT ", src_format:%d, dest_format:%d", src_value, src_format, *dest_format); if (*dest_format == GST_FORMAT_DEFAULT) *dest_format = GST_FORMAT_TIME; if (*dest_format == src_format || src_value == -1) { *dest_value = src_value; goto done; } if (dvdemux->frame_len <= 0) goto error; switch (src_format) { case GST_FORMAT_BYTES: switch (*dest_format) { case GST_FORMAT_TIME: { guint64 frame; /* get frame number, rounds down so don't combine this * line and the next line. */ frame = src_value / dvdemux->frame_len; *dest_value = gst_util_uint64_scale (frame, GST_SECOND * dvdemux->framerate_denominator, dvdemux->framerate_numerator); break; } default: res = FALSE; } break; case GST_FORMAT_TIME: switch (*dest_format) { case GST_FORMAT_BYTES: { guint64 frame; /* calculate the frame */ frame = gst_util_uint64_scale (src_value, dvdemux->framerate_numerator, dvdemux->framerate_denominator * GST_SECOND); /* calculate the offset from the rounded frame */ *dest_value = frame * dvdemux->frame_len; break; } default: res = FALSE; } break; default: res = FALSE; } GST_INFO_OBJECT (dvdemux, "Result : dest_format:%d, dest_value:%" G_GINT64_FORMAT ", res:%d", *dest_format, *dest_value, res); done: return res; error: { GST_INFO_OBJECT (dvdemux, "sink conversion failed"); return FALSE; } } static gboolean gst_dvdemux_src_query (GstPad * pad, GstObject * parent, GstQuery * query) { gboolean res = TRUE; GstDVDemux *dvdemux; dvdemux = GST_DVDEMUX (parent); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_POSITION: { GstFormat format; gint64 cur; /* get target format */ gst_query_parse_position (query, &format, NULL); /* bring the position to the requested format. */ if (!(res = gst_dvdemux_src_convert (dvdemux, pad, GST_FORMAT_TIME, dvdemux->time_segment.position, &format, &cur))) goto error; gst_query_set_position (query, format, cur); break; } case GST_QUERY_DURATION: { GstFormat format; GstFormat format2; gint64 end; /* First ask the peer in the original format */ if (!gst_pad_peer_query (dvdemux->sinkpad, query)) { /* get target format */ gst_query_parse_duration (query, &format, NULL); /* change query to bytes to perform on peer */ gst_query_set_duration (query, GST_FORMAT_BYTES, -1); /* Now ask the peer in BYTES format and try to convert */ if (!gst_pad_peer_query (dvdemux->sinkpad, query)) { goto error; } /* get peer total length */ gst_query_parse_duration (query, NULL, &end); /* convert end to requested format */ if (end != -1) { format2 = format; if (!(res = gst_dvdemux_sink_convert (dvdemux, GST_FORMAT_BYTES, end, &format2, &end))) { goto error; } gst_query_set_duration (query, format, end); } } break; } case GST_QUERY_CONVERT: { GstFormat src_fmt, dest_fmt; gint64 src_val, dest_val; gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val); if (!(res = gst_dvdemux_src_convert (dvdemux, pad, src_fmt, src_val, &dest_fmt, &dest_val))) goto error; gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val); break; } default: res = gst_pad_query_default (pad, parent, query); break; } return res; /* ERRORS */ error: { GST_DEBUG ("error source query"); return FALSE; } } static gboolean gst_dvdemux_sink_query (GstPad * pad, GstObject * parent, GstQuery * query) { gboolean res = TRUE; GstDVDemux *dvdemux; dvdemux = GST_DVDEMUX (parent); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_CONVERT: { GstFormat src_fmt, dest_fmt; gint64 src_val, dest_val; gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val); if (!(res = gst_dvdemux_sink_convert (dvdemux, src_fmt, src_val, &dest_fmt, &dest_val))) goto error; gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val); break; } default: res = gst_pad_query_default (pad, parent, query); break; } return res; /* ERRORS */ error: { GST_DEBUG ("error handling sink query"); return FALSE; } } /* takes ownership of the event */ static gboolean gst_dvdemux_push_event (GstDVDemux * dvdemux, GstEvent * event) { gboolean res = FALSE; if (dvdemux->videosrcpad) { gst_event_ref (event); res |= gst_pad_push_event (dvdemux->videosrcpad, event); } if (dvdemux->audiosrcpad) res |= gst_pad_push_event (dvdemux->audiosrcpad, event); else gst_event_unref (event); return res; } static gboolean gst_dvdemux_handle_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstDVDemux *dvdemux = GST_DVDEMUX (parent); gboolean res = TRUE; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_START: /* we are not blocking on anything exect the push() calls * to the peer which will be unblocked by forwarding the * event.*/ res = gst_dvdemux_push_event (dvdemux, event); break; case GST_EVENT_FLUSH_STOP: gst_adapter_clear (dvdemux->adapter); GST_DEBUG ("cleared adapter"); gst_segment_init (&dvdemux->byte_segment, GST_FORMAT_BYTES); gst_segment_init (&dvdemux->time_segment, GST_FORMAT_TIME); res = gst_dvdemux_push_event (dvdemux, event); break; case GST_EVENT_SEGMENT: { const GstSegment *segment; gst_event_parse_segment (event, &segment); switch (segment->format) { case GST_FORMAT_BYTES: gst_segment_copy_into (segment, &dvdemux->byte_segment); dvdemux->need_segment = TRUE; gst_event_unref (event); break; case GST_FORMAT_TIME: gst_segment_copy_into (segment, &dvdemux->time_segment); /* and we can just forward this time event */ res = gst_dvdemux_push_event (dvdemux, event); break; default: gst_event_unref (event); /* cannot accept this format */ res = FALSE; break; } break; } case GST_EVENT_EOS: /* flush any pending data, should be nothing left. */ gst_dvdemux_flush (dvdemux); /* forward event */ res = gst_dvdemux_push_event (dvdemux, event); /* and clear the adapter */ gst_adapter_clear (dvdemux->adapter); break; case GST_EVENT_CAPS: gst_event_unref (event); break; default: res = gst_dvdemux_push_event (dvdemux, event); break; } return res; } /* convert a pair of values on the given srcpad */ static gboolean gst_dvdemux_convert_src_pair (GstDVDemux * dvdemux, GstPad * pad, GstFormat src_format, gint64 src_start, gint64 src_stop, GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop) { gboolean res; GST_INFO ("starting conversion of start"); /* bring the format to time on srcpad. */ if (!(res = gst_dvdemux_src_convert (dvdemux, pad, src_format, src_start, &dst_format, dst_start))) { goto done; } GST_INFO ("Finished conversion of start: %" G_GINT64_FORMAT, *dst_start); GST_INFO ("starting conversion of stop"); /* bring the format to time on srcpad. */ if (!(res = gst_dvdemux_src_convert (dvdemux, pad, src_format, src_stop, &dst_format, dst_stop))) { /* could not convert seek format to time offset */ goto done; } GST_INFO ("Finished conversion of stop: %" G_GINT64_FORMAT, *dst_stop); done: return res; } /* convert a pair of values on the sinkpad */ static gboolean gst_dvdemux_convert_sink_pair (GstDVDemux * dvdemux, GstFormat src_format, gint64 src_start, gint64 src_stop, GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop) { gboolean res; GST_INFO ("starting conversion of start"); /* bring the format to time on srcpad. */ if (!(res = gst_dvdemux_sink_convert (dvdemux, src_format, src_start, &dst_format, dst_start))) { goto done; } GST_INFO ("Finished conversion of start: %" G_GINT64_FORMAT, *dst_start); GST_INFO ("starting conversion of stop"); /* bring the format to time on srcpad. */ if (!(res = gst_dvdemux_sink_convert (dvdemux, src_format, src_stop, &dst_format, dst_stop))) { /* could not convert seek format to time offset */ goto done; } GST_INFO ("Finished conversion of stop: %" G_GINT64_FORMAT, *dst_stop); done: return res; } /* convert a pair of values on the srcpad to a pair of * values on the sinkpad */ static gboolean gst_dvdemux_convert_src_to_sink (GstDVDemux * dvdemux, GstPad * pad, GstFormat src_format, gint64 src_start, gint64 src_stop, GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop) { GstFormat conv; gboolean res; conv = GST_FORMAT_TIME; /* convert to TIME intermediate format */ if (!(res = gst_dvdemux_convert_src_pair (dvdemux, pad, src_format, src_start, src_stop, conv, dst_start, dst_stop))) { /* could not convert format to time offset */ goto done; } /* convert to dst format on sinkpad */ if (!(res = gst_dvdemux_convert_sink_pair (dvdemux, conv, *dst_start, *dst_stop, dst_format, dst_start, dst_stop))) { /* could not convert format to time offset */ goto done; } done: return res; } #if 0 static gboolean gst_dvdemux_convert_segment (GstDVDemux * dvdemux, GstSegment * src, GstSegment * dest) { dest->rate = src->rate; dest->abs_rate = src->abs_rate; dest->flags = src->flags; return TRUE; } #endif /* handle seek in push base mode. * * Convert the time seek to a bytes seek and send it * upstream * Does not take ownership of the event. */ static gboolean gst_dvdemux_handle_push_seek (GstDVDemux * dvdemux, GstPad * pad, GstEvent * event) { gboolean res = FALSE; gdouble rate; GstSeekFlags flags; GstFormat format; GstSeekType cur_type, stop_type; gint64 cur, stop; gint64 start_position, end_position; GstEvent *newevent; gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur, &stop_type, &stop); /* First try if upstream can handle time based seeks */ if (format == GST_FORMAT_TIME) res = gst_pad_push_event (dvdemux->sinkpad, gst_event_ref (event)); if (!res) { /* we convert the start/stop on the srcpad to the byte format * on the sinkpad and forward the event */ res = gst_dvdemux_convert_src_to_sink (dvdemux, pad, format, cur, stop, GST_FORMAT_BYTES, &start_position, &end_position); if (!res) goto done; /* now this is the updated seek event on bytes */ newevent = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags, cur_type, start_position, stop_type, end_position); res = gst_pad_push_event (dvdemux->sinkpad, newevent); } done: return res; } /* position ourselves to the configured segment, used in pull mode. * The input segment is in TIME format. We convert the time values * to bytes values into our byte_segment which we use to pull data from * the sinkpad peer. */ static gboolean gst_dvdemux_do_seek (GstDVDemux * demux, GstSegment * segment) { gboolean res; GstFormat format; /* position to value configured is last_stop, this will round down * to the byte position where the frame containing the given * timestamp can be found. */ format = GST_FORMAT_BYTES; res = gst_dvdemux_sink_convert (demux, segment->format, segment->position, &format, (gint64 *) & demux->byte_segment.position); if (!res) goto done; /* update byte segment start */ gst_dvdemux_sink_convert (demux, segment->format, segment->start, &format, (gint64 *) & demux->byte_segment.start); /* update byte segment stop */ gst_dvdemux_sink_convert (demux, segment->format, segment->stop, &format, (gint64 *) & demux->byte_segment.stop); /* update byte segment time */ gst_dvdemux_sink_convert (demux, segment->format, segment->time, &format, (gint64 *) & demux->byte_segment.time); /* calculate current frame number */ format = GST_FORMAT_DEFAULT; gst_dvdemux_src_convert (demux, demux->videosrcpad, segment->format, segment->start, &format, &demux->video_offset); /* calculate current audio number */ format = GST_FORMAT_DEFAULT; gst_dvdemux_src_convert (demux, demux->audiosrcpad, segment->format, segment->start, &format, &demux->audio_offset); /* every DV frame corresponts with one video frame */ demux->frame_offset = demux->video_offset; done: return res; } /* handle seek in pull base mode. * * Does not take ownership of the event. */ static gboolean gst_dvdemux_handle_pull_seek (GstDVDemux * demux, GstPad * pad, GstEvent * event) { gboolean res; gdouble rate; GstFormat format; GstSeekFlags flags; GstSeekType cur_type, stop_type; gint64 cur, stop; gboolean flush; gboolean update; GstSegment seeksegment; GST_DEBUG_OBJECT (demux, "doing seek"); /* first bring the event format to TIME, our native format * to perform the seek on */ if (event) { GstFormat conv; gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur, &stop_type, &stop); /* can't seek backwards yet */ if (rate <= 0.0) goto wrong_rate; /* convert input format to TIME */ conv = GST_FORMAT_TIME; if (!(gst_dvdemux_convert_src_pair (demux, pad, format, cur, stop, conv, &cur, &stop))) goto no_format; format = GST_FORMAT_TIME; } else { flags = 0; } flush = flags & GST_SEEK_FLAG_FLUSH; /* send flush start */ if (flush) gst_dvdemux_push_event (demux, gst_event_new_flush_start ()); else gst_pad_pause_task (demux->sinkpad); /* grab streaming lock, this should eventually be possible, either * because the task is paused or our streaming thread stopped * because our peer is flushing. */ GST_PAD_STREAM_LOCK (demux->sinkpad); /* make copy into temp structure, we can only update the main one * when the subclass actually could to the seek. */ memcpy (&seeksegment, &demux->time_segment, sizeof (GstSegment)); /* now configure the seek segment */ if (event) { gst_segment_do_seek (&seeksegment, rate, format, flags, cur_type, cur, stop_type, stop, &update); } GST_DEBUG_OBJECT (demux, "segment configured from %" G_GINT64_FORMAT " to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT, seeksegment.start, seeksegment.stop, seeksegment.position); /* do the seek, segment.position contains new position. */ res = gst_dvdemux_do_seek (demux, &seeksegment); /* and prepare to continue streaming */ if (flush) { /* send flush stop, peer will accept data and events again. We * are not yet providing data as we still have the STREAM_LOCK. */ gst_dvdemux_push_event (demux, gst_event_new_flush_stop (TRUE)); } /* if successfull seek, we update our real segment and push * out the new segment. */ if (res) { memcpy (&demux->time_segment, &seeksegment, sizeof (GstSegment)); if (demux->time_segment.flags & GST_SEEK_FLAG_SEGMENT) { gst_element_post_message (GST_ELEMENT_CAST (demux), gst_message_new_segment_start (GST_OBJECT_CAST (demux), demux->time_segment.format, demux->time_segment.position)); } if ((stop = demux->time_segment.stop) == -1) stop = demux->time_segment.duration; GST_INFO_OBJECT (demux, "Saving newsegment event to be sent in streaming thread"); if (demux->pending_segment) gst_event_unref (demux->pending_segment); demux->pending_segment = gst_event_new_segment (&demux->time_segment); demux->need_segment = FALSE; } /* and restart the task in case it got paused explicitely or by * the FLUSH_START event we pushed out. */ gst_pad_start_task (demux->sinkpad, (GstTaskFunction) gst_dvdemux_loop, demux->sinkpad, NULL); /* and release the lock again so we can continue streaming */ GST_PAD_STREAM_UNLOCK (demux->sinkpad); return TRUE; /* ERRORS */ wrong_rate: { GST_DEBUG_OBJECT (demux, "negative playback rate %lf not supported.", rate); return FALSE; } no_format: { GST_DEBUG_OBJECT (demux, "cannot convert to TIME format, seek aborted."); return FALSE; } } static gboolean gst_dvdemux_send_event (GstElement * element, GstEvent * event) { GstDVDemux *dvdemux = GST_DVDEMUX (element); gboolean res = FALSE; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEEK: { /* checking header and configuring the seek must be atomic */ GST_OBJECT_LOCK (dvdemux); if (g_atomic_int_get (&dvdemux->found_header) == 0) { GstEvent **event_p; event_p = &dvdemux->seek_event; /* We don't have pads yet. Keep the event. */ GST_INFO_OBJECT (dvdemux, "Keeping the seek event for later"); gst_event_replace (event_p, event); GST_OBJECT_UNLOCK (dvdemux); res = TRUE; } else { GST_OBJECT_UNLOCK (dvdemux); if (dvdemux->seek_handler) { res = dvdemux->seek_handler (dvdemux, dvdemux->videosrcpad, event); gst_event_unref (event); } } break; } default: res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event); break; } return res; } /* handle an event on the source pad, it's most likely a seek */ static gboolean gst_dvdemux_handle_src_event (GstPad * pad, GstObject * parent, GstEvent * event) { gboolean res = TRUE; GstDVDemux *dvdemux; dvdemux = GST_DVDEMUX (parent); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEEK: /* seek handler is installed based on scheduling mode */ if (dvdemux->seek_handler) res = dvdemux->seek_handler (dvdemux, pad, event); else res = FALSE; break; case GST_EVENT_QOS: /* we can't really (yet) do QoS */ res = FALSE; break; case GST_EVENT_NAVIGATION: case GST_EVENT_CAPS: /* no navigation or caps either... */ res = FALSE; break; default: res = gst_pad_push_event (dvdemux->sinkpad, event); event = NULL; break; } if (event) gst_event_unref (event); return res; } /* does not take ownership of buffer */ static GstFlowReturn gst_dvdemux_demux_audio (GstDVDemux * dvdemux, GstBuffer * buffer, guint64 duration) { gint num_samples; GstFlowReturn ret; GstMapInfo map; gst_buffer_map (buffer, &map, GST_MAP_READ); dv_decode_full_audio (dvdemux->decoder, map.data, dvdemux->audio_buffers); gst_buffer_unmap (buffer, &map); if (G_LIKELY ((num_samples = dv_get_num_samples (dvdemux->decoder)) > 0)) { gint16 *a_ptr; gint i, j; GstBuffer *outbuf; gint frequency, channels; if (G_UNLIKELY (dvdemux->audiosrcpad == NULL)) dvdemux->audiosrcpad = gst_dvdemux_add_pad (dvdemux, &audio_src_temp); /* get initial format or check if format changed */ frequency = dv_get_frequency (dvdemux->decoder); channels = dv_get_num_channels (dvdemux->decoder); if (G_UNLIKELY ((frequency != dvdemux->frequency) || (channels != dvdemux->channels))) { GstCaps *caps; GstAudioInfo info; gchar *stream_id; stream_id = gst_pad_create_stream_id (dvdemux->audiosrcpad, GST_ELEMENT_CAST (dvdemux), "audio"); gst_pad_push_event (dvdemux->audiosrcpad, gst_event_new_stream_start (stream_id)); g_free (stream_id); dvdemux->frequency = frequency; dvdemux->channels = channels; gst_audio_info_init (&info); gst_audio_info_set_format (&info, GST_AUDIO_FORMAT_S16LE, frequency, channels, NULL); caps = gst_audio_info_to_caps (&info); gst_pad_set_caps (dvdemux->audiosrcpad, caps); gst_caps_unref (caps); } outbuf = gst_buffer_new_and_alloc (num_samples * sizeof (gint16) * dvdemux->channels); gst_buffer_map (outbuf, &map, GST_MAP_WRITE); a_ptr = (gint16 *) map.data; for (i = 0; i < num_samples; i++) { for (j = 0; j < dvdemux->channels; j++) { *(a_ptr++) = dvdemux->audio_buffers[j][i]; } } gst_buffer_unmap (outbuf, &map); GST_DEBUG ("pushing audio %" GST_TIME_FORMAT, GST_TIME_ARGS (dvdemux->time_segment.position)); GST_BUFFER_TIMESTAMP (outbuf) = dvdemux->time_segment.position; GST_BUFFER_DURATION (outbuf) = duration; GST_BUFFER_OFFSET (outbuf) = dvdemux->audio_offset; dvdemux->audio_offset += num_samples; GST_BUFFER_OFFSET_END (outbuf) = dvdemux->audio_offset; if (dvdemux->new_media) GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT); ret = gst_pad_push (dvdemux->audiosrcpad, outbuf); } else { /* no samples */ ret = GST_FLOW_OK; } return ret; } /* takes ownership of buffer */ static GstFlowReturn gst_dvdemux_demux_video (GstDVDemux * dvdemux, GstBuffer * buffer, guint64 duration) { GstBuffer *outbuf; gint height; gboolean wide; GstFlowReturn ret = GST_FLOW_OK; if (G_UNLIKELY (dvdemux->videosrcpad == NULL)) dvdemux->videosrcpad = gst_dvdemux_add_pad (dvdemux, &video_src_temp); /* get params */ /* framerate is already up-to-date */ height = dvdemux->decoder->height; wide = dv_format_wide (dvdemux->decoder); /* see if anything changed */ if (G_UNLIKELY ((dvdemux->height != height) || dvdemux->wide != wide)) { GstCaps *caps; gint par_x, par_y; gchar *stream_id; stream_id = gst_pad_create_stream_id (dvdemux->videosrcpad, GST_ELEMENT_CAST (dvdemux), "video"); gst_pad_push_event (dvdemux->videosrcpad, gst_event_new_stream_start (stream_id)); g_free (stream_id); dvdemux->height = height; dvdemux->wide = wide; if (dvdemux->decoder->system == e_dv_system_625_50) { if (wide) { par_x = PAL_WIDE_PAR_X; par_y = PAL_WIDE_PAR_Y; } else { par_x = PAL_NORMAL_PAR_X; par_y = PAL_NORMAL_PAR_Y; } } else { if (wide) { par_x = NTSC_WIDE_PAR_X; par_y = NTSC_WIDE_PAR_Y; } else { par_x = NTSC_NORMAL_PAR_X; par_y = NTSC_NORMAL_PAR_Y; } } caps = gst_caps_new_simple ("video/x-dv", "systemstream", G_TYPE_BOOLEAN, FALSE, "width", G_TYPE_INT, 720, "height", G_TYPE_INT, height, "framerate", GST_TYPE_FRACTION, dvdemux->framerate_numerator, dvdemux->framerate_denominator, "pixel-aspect-ratio", GST_TYPE_FRACTION, par_x, par_y, NULL); gst_pad_set_caps (dvdemux->videosrcpad, caps); gst_caps_unref (caps); } /* takes ownership of buffer here, we just need to modify * the metadata. */ outbuf = gst_buffer_make_writable (buffer); GST_BUFFER_TIMESTAMP (outbuf) = dvdemux->time_segment.position; GST_BUFFER_OFFSET (outbuf) = dvdemux->video_offset; GST_BUFFER_OFFSET_END (outbuf) = dvdemux->video_offset + 1; GST_BUFFER_DURATION (outbuf) = duration; if (dvdemux->new_media) GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT); GST_DEBUG ("pushing video %" GST_TIME_FORMAT, GST_TIME_ARGS (dvdemux->time_segment.position)); ret = gst_pad_push (dvdemux->videosrcpad, outbuf); dvdemux->video_offset++; return ret; } static int get_ssyb_offset (int dif, int ssyb) { int offset; offset = dif * 12000; /* to dif */ offset += 80 * (1 + (ssyb / 6)); /* to subcode pack */ offset += 3; /* past header */ offset += 8 * (ssyb % 6); /* to ssyb */ return offset; } static gboolean gst_dvdemux_get_timecode (GstDVDemux * dvdemux, GstBuffer * buffer, GstSMPTETimeCode * timecode) { guint8 *data; GstMapInfo map; int offset; int dif; int n_difs = dvdemux->decoder->num_dif_seqs; gst_buffer_map (buffer, &map, GST_MAP_READ); data = map.data; for (dif = 0; dif < n_difs; dif++) { offset = get_ssyb_offset (dif, 3); if (data[offset + 3] == 0x13) { timecode->frames = ((data[offset + 4] >> 4) & 0x3) * 10 + (data[offset + 4] & 0xf); timecode->seconds = ((data[offset + 5] >> 4) & 0x3) * 10 + (data[offset + 5] & 0xf); timecode->minutes = ((data[offset + 6] >> 4) & 0x3) * 10 + (data[offset + 6] & 0xf); timecode->hours = ((data[offset + 7] >> 4) & 0x3) * 10 + (data[offset + 7] & 0xf); GST_DEBUG ("got timecode %" GST_SMPTE_TIME_CODE_FORMAT, GST_SMPTE_TIME_CODE_ARGS (timecode)); gst_buffer_unmap (buffer, &map); return TRUE; } } gst_buffer_unmap (buffer, &map); return FALSE; } static gboolean gst_dvdemux_is_new_media (GstDVDemux * dvdemux, GstBuffer * buffer) { guint8 *data; GstMapInfo map; int aaux_offset; int dif; int n_difs; n_difs = dvdemux->decoder->num_dif_seqs; gst_buffer_map (buffer, &map, GST_MAP_READ); data = map.data; for (dif = 0; dif < n_difs; dif++) { if (dif & 1) { aaux_offset = (dif * 12000) + (6 + 16 * 1) * 80 + 3; } else { aaux_offset = (dif * 12000) + (6 + 16 * 4) * 80 + 3; } if (data[aaux_offset + 0] == 0x51) { if ((data[aaux_offset + 2] & 0x80) == 0) { gst_buffer_unmap (buffer, &map); return TRUE; } } } gst_buffer_unmap (buffer, &map); return FALSE; } /* takes ownership of buffer */ static GstFlowReturn gst_dvdemux_demux_frame (GstDVDemux * dvdemux, GstBuffer * buffer) { GstClockTime next_ts; GstFlowReturn aret, vret, ret; GstMapInfo map; guint64 duration; GstSMPTETimeCode timecode; int frame_number; if (G_UNLIKELY (dvdemux->need_segment)) { GstFormat format; /* convert to time and store as start/end_timestamp */ format = GST_FORMAT_TIME; if (!(gst_dvdemux_convert_sink_pair (dvdemux, GST_FORMAT_BYTES, dvdemux->byte_segment.start, dvdemux->byte_segment.stop, format, (gint64 *) & dvdemux->time_segment.start, (gint64 *) & dvdemux->time_segment.stop))) goto segment_error; dvdemux->time_segment.rate = dvdemux->byte_segment.rate; dvdemux->time_segment.position = dvdemux->time_segment.start; /* calculate current frame number */ format = GST_FORMAT_DEFAULT; if (!(gst_dvdemux_src_convert (dvdemux, dvdemux->videosrcpad, GST_FORMAT_TIME, dvdemux->time_segment.start, &format, &dvdemux->frame_offset))) goto segment_error; GST_DEBUG_OBJECT (dvdemux, "sending segment start: %" GST_TIME_FORMAT ", stop: %" GST_TIME_FORMAT ", time: %" GST_TIME_FORMAT, GST_TIME_ARGS (dvdemux->time_segment.start), GST_TIME_ARGS (dvdemux->time_segment.stop), GST_TIME_ARGS (dvdemux->time_segment.start)); gst_dvdemux_push_event (dvdemux, gst_event_new_segment (&dvdemux->time_segment)); dvdemux->need_segment = FALSE; } gst_dvdemux_get_timecode (dvdemux, buffer, &timecode); gst_smpte_time_code_get_frame_number ( (dvdemux->decoder->system == e_dv_system_625_50) ? GST_SMPTE_TIME_CODE_SYSTEM_25 : GST_SMPTE_TIME_CODE_SYSTEM_30, &frame_number, &timecode); next_ts = gst_util_uint64_scale_int ( (dvdemux->frame_offset + 1) * GST_SECOND, dvdemux->framerate_denominator, dvdemux->framerate_numerator); duration = next_ts - dvdemux->time_segment.position; gst_buffer_map (buffer, &map, GST_MAP_READ); dv_parse_packs (dvdemux->decoder, map.data); gst_buffer_unmap (buffer, &map); dvdemux->new_media = FALSE; if (gst_dvdemux_is_new_media (dvdemux, buffer) && dvdemux->frames_since_new_media > 2) { dvdemux->new_media = TRUE; dvdemux->frames_since_new_media = 0; } dvdemux->frames_since_new_media++; /* does not take ownership of buffer */ aret = ret = gst_dvdemux_demux_audio (dvdemux, buffer, duration); if (G_UNLIKELY (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED)) { gst_buffer_unref (buffer); goto done; } /* takes ownership of buffer */ vret = ret = gst_dvdemux_demux_video (dvdemux, buffer, duration); if (G_UNLIKELY (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED)) goto done; /* if both are not linked, we stop */ if (G_UNLIKELY (aret == GST_FLOW_NOT_LINKED && vret == GST_FLOW_NOT_LINKED)) { ret = GST_FLOW_NOT_LINKED; goto done; } dvdemux->time_segment.position = next_ts; dvdemux->frame_offset++; /* check for the end of the segment */ if (dvdemux->time_segment.stop != -1 && next_ts > dvdemux->time_segment.stop) ret = GST_FLOW_EOS; else ret = GST_FLOW_OK; done: return ret; /* ERRORS */ segment_error: { GST_DEBUG ("error generating new_segment event"); gst_buffer_unref (buffer); return GST_FLOW_ERROR; } } /* flush any remaining data in the adapter, used in chain based scheduling mode */ static GstFlowReturn gst_dvdemux_flush (GstDVDemux * dvdemux) { GstFlowReturn ret = GST_FLOW_OK; while (gst_adapter_available (dvdemux->adapter) >= dvdemux->frame_len) { const guint8 *data; gint length; /* get the accumulated bytes */ data = gst_adapter_map (dvdemux->adapter, dvdemux->frame_len); /* parse header to know the length and other params */ if (G_UNLIKELY (dv_parse_header (dvdemux->decoder, data) < 0)) { gst_adapter_unmap (dvdemux->adapter); goto parse_header_error; } gst_adapter_unmap (dvdemux->adapter); /* after parsing the header we know the length of the data */ length = dvdemux->frame_len = dvdemux->decoder->frame_size; if (dvdemux->decoder->system == e_dv_system_625_50) { dvdemux->framerate_numerator = PAL_FRAMERATE_NUMERATOR; dvdemux->framerate_denominator = PAL_FRAMERATE_DENOMINATOR; } else { dvdemux->framerate_numerator = NTSC_FRAMERATE_NUMERATOR; dvdemux->framerate_denominator = NTSC_FRAMERATE_DENOMINATOR; } g_atomic_int_set (&dvdemux->found_header, 1); /* let demux_video set the height, it needs to detect when things change so * it can reset caps */ /* if we still have enough for a frame, start decoding */ if (G_LIKELY (gst_adapter_available (dvdemux->adapter) >= length)) { GstBuffer *buffer; buffer = gst_adapter_take_buffer (dvdemux->adapter, length); /* and decode the buffer, takes ownership */ ret = gst_dvdemux_demux_frame (dvdemux, buffer); if (G_UNLIKELY (ret != GST_FLOW_OK)) goto done; } } done: return ret; /* ERRORS */ parse_header_error: { GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE, (NULL), ("Error parsing DV header")); return GST_FLOW_ERROR; } } /* streaming operation: * * accumulate data until we have a frame, then decode. */ static GstFlowReturn gst_dvdemux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer) { GstDVDemux *dvdemux; GstFlowReturn ret; GstClockTime timestamp; dvdemux = GST_DVDEMUX (parent); /* a discontinuity in the stream, we need to get rid of * accumulated data in the adapter and assume a new frame * starts after the discontinuity */ if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) gst_adapter_clear (dvdemux->adapter); /* a timestamp always should be respected */ timestamp = GST_BUFFER_TIMESTAMP (buffer); if (GST_CLOCK_TIME_IS_VALID (timestamp)) { dvdemux->time_segment.position = timestamp; /* FIXME, adjust frame_offset and other counters */ } gst_adapter_push (dvdemux->adapter, buffer); /* Apparently dv_parse_header can read from the body of the frame * too, so it needs more than header_size bytes. Wacky! */ if (G_UNLIKELY (dvdemux->frame_len == -1)) { /* if we don't know the length of a frame, we assume it is * the NTSC_BUFFER length, as this is enough to figure out * if this is PAL or NTSC */ dvdemux->frame_len = NTSC_BUFFER; } /* and try to flush pending frames */ ret = gst_dvdemux_flush (dvdemux); return ret; } /* pull based operation. * * Read header first to figure out the frame size. Then read * and decode full frames. */ static void gst_dvdemux_loop (GstPad * pad) { GstFlowReturn ret; GstDVDemux *dvdemux; GstBuffer *buffer = NULL; GstMapInfo map; dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad)); if (G_UNLIKELY (g_atomic_int_get (&dvdemux->found_header) == 0)) { GST_DEBUG_OBJECT (dvdemux, "pulling first buffer"); /* pull in NTSC sized buffer to figure out the frame * length */ ret = gst_pad_pull_range (dvdemux->sinkpad, dvdemux->byte_segment.position, NTSC_BUFFER, &buffer); if (G_UNLIKELY (ret != GST_FLOW_OK)) goto pause; /* check buffer size, don't want to read small buffers */ if (G_UNLIKELY (gst_buffer_get_size (buffer) < NTSC_BUFFER)) goto small_buffer; gst_buffer_map (buffer, &map, GST_MAP_READ); /* parse header to know the length and other params */ if (G_UNLIKELY (dv_parse_header (dvdemux->decoder, map.data) < 0)) { gst_buffer_unmap (buffer, &map); goto parse_header_error; } gst_buffer_unmap (buffer, &map); /* after parsing the header we know the length of the data */ dvdemux->frame_len = dvdemux->decoder->frame_size; if (dvdemux->decoder->system == e_dv_system_625_50) { dvdemux->framerate_numerator = PAL_FRAMERATE_NUMERATOR; dvdemux->framerate_denominator = PAL_FRAMERATE_DENOMINATOR; } else { dvdemux->framerate_numerator = NTSC_FRAMERATE_NUMERATOR; dvdemux->framerate_denominator = NTSC_FRAMERATE_DENOMINATOR; } dvdemux->need_segment = TRUE; /* see if we need to read a larger part */ if (dvdemux->frame_len != NTSC_BUFFER) { gst_buffer_unref (buffer); buffer = NULL; } { GstEvent *event; /* setting header and prrforming the seek must be atomic */ GST_OBJECT_LOCK (dvdemux); /* got header now */ g_atomic_int_set (&dvdemux->found_header, 1); /* now perform pending seek if any. */ event = dvdemux->seek_event; if (event) gst_event_ref (event); GST_OBJECT_UNLOCK (dvdemux); if (event) { if (!gst_dvdemux_handle_pull_seek (dvdemux, dvdemux->videosrcpad, event)) { GST_ELEMENT_WARNING (dvdemux, STREAM, DECODE, (NULL), ("Error perfoming initial seek")); } gst_event_unref (event); /* and we need to pull a new buffer in all cases. */ if (buffer) { gst_buffer_unref (buffer); buffer = NULL; } } } } if (G_UNLIKELY (dvdemux->pending_segment)) { /* now send the newsegment */ GST_DEBUG_OBJECT (dvdemux, "Sending newsegment from"); gst_dvdemux_push_event (dvdemux, dvdemux->pending_segment); dvdemux->pending_segment = NULL; } if (G_LIKELY (buffer == NULL)) { GST_DEBUG_OBJECT (dvdemux, "pulling buffer at offset %" G_GINT64_FORMAT, dvdemux->byte_segment.position); ret = gst_pad_pull_range (dvdemux->sinkpad, dvdemux->byte_segment.position, dvdemux->frame_len, &buffer); if (ret != GST_FLOW_OK) goto pause; /* check buffer size, don't want to read small buffers */ if (gst_buffer_get_size (buffer) < dvdemux->frame_len) goto small_buffer; } /* and decode the buffer */ ret = gst_dvdemux_demux_frame (dvdemux, buffer); if (G_UNLIKELY (ret != GST_FLOW_OK)) goto pause; /* and position ourselves for the next buffer */ dvdemux->byte_segment.position += dvdemux->frame_len; done: gst_object_unref (dvdemux); return; /* ERRORS */ parse_header_error: { GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE, (NULL), ("Error parsing DV header")); gst_buffer_unref (buffer); gst_pad_pause_task (dvdemux->sinkpad); gst_dvdemux_push_event (dvdemux, gst_event_new_eos ()); goto done; } small_buffer: { GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE, (NULL), ("Error reading buffer")); gst_buffer_unref (buffer); gst_pad_pause_task (dvdemux->sinkpad); gst_dvdemux_push_event (dvdemux, gst_event_new_eos ()); goto done; } pause: { GST_INFO_OBJECT (dvdemux, "pausing task, %s", gst_flow_get_name (ret)); gst_pad_pause_task (dvdemux->sinkpad); if (ret == GST_FLOW_EOS) { GST_LOG_OBJECT (dvdemux, "got eos"); /* so align our position with the end of it, if there is one * this ensures a subsequent will arrive at correct base/acc time */ if (dvdemux->time_segment.rate > 0.0 && GST_CLOCK_TIME_IS_VALID (dvdemux->time_segment.stop)) dvdemux->time_segment.position = dvdemux->time_segment.stop; else if (dvdemux->time_segment.rate < 0.0) dvdemux->time_segment.position = dvdemux->time_segment.start; /* perform EOS logic */ if (dvdemux->time_segment.flags & GST_SEEK_FLAG_SEGMENT) { gst_element_post_message (GST_ELEMENT (dvdemux), gst_message_new_segment_done (GST_OBJECT_CAST (dvdemux), dvdemux->time_segment.format, dvdemux->time_segment.position)); gst_dvdemux_push_event (dvdemux, gst_event_new_segment_done (dvdemux->time_segment.format, dvdemux->time_segment.position)); } else { gst_dvdemux_push_event (dvdemux, gst_event_new_eos ()); } } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) { /* for fatal errors or not-linked we post an error message */ GST_ELEMENT_ERROR (dvdemux, STREAM, FAILED, (NULL), ("streaming stopped, reason %s", gst_flow_get_name (ret))); gst_dvdemux_push_event (dvdemux, gst_event_new_eos ()); } goto done; } } static gboolean gst_dvdemux_sink_activate_mode (GstPad * sinkpad, GstObject * parent, GstPadMode mode, gboolean active) { gboolean res; GstDVDemux *demux = GST_DVDEMUX (parent); switch (mode) { case GST_PAD_MODE_PULL: if (active) { demux->seek_handler = gst_dvdemux_handle_pull_seek; res = gst_pad_start_task (sinkpad, (GstTaskFunction) gst_dvdemux_loop, sinkpad, NULL); } else { demux->seek_handler = NULL; res = gst_pad_stop_task (sinkpad); } break; case GST_PAD_MODE_PUSH: if (active) { GST_DEBUG_OBJECT (demux, "activating push/chain function"); demux->seek_handler = gst_dvdemux_handle_push_seek; } else { GST_DEBUG_OBJECT (demux, "deactivating push/chain function"); demux->seek_handler = NULL; } res = TRUE; break; default: res = FALSE; break; } return res; } /* decide on push or pull based scheduling */ static gboolean gst_dvdemux_sink_activate (GstPad * sinkpad, GstObject * parent) { GstQuery *query; gboolean pull_mode; query = gst_query_new_scheduling (); if (!gst_pad_peer_query (sinkpad, query)) { gst_query_unref (query); goto activate_push; } pull_mode = gst_query_has_scheduling_mode_with_flags (query, GST_PAD_MODE_PULL, GST_SCHEDULING_FLAG_SEEKABLE); gst_query_unref (query); if (!pull_mode) goto activate_push; GST_DEBUG_OBJECT (sinkpad, "activating pull"); return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE); activate_push: { GST_DEBUG_OBJECT (sinkpad, "activating push"); return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE); } } static GstStateChangeReturn gst_dvdemux_change_state (GstElement * element, GstStateChange transition) { GstDVDemux *dvdemux = GST_DVDEMUX (element); GstStateChangeReturn ret; switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: dvdemux->decoder = dv_decoder_new (0, FALSE, FALSE); dv_set_error_log (dvdemux->decoder, NULL); gst_dvdemux_reset (dvdemux); break; case GST_STATE_CHANGE_PAUSED_TO_PLAYING: break; 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_adapter_clear (dvdemux->adapter); dv_decoder_free (dvdemux->decoder); dvdemux->decoder = NULL; gst_dvdemux_remove_pads (dvdemux); break; case GST_STATE_CHANGE_READY_TO_NULL: { GstEvent **event_p; event_p = &dvdemux->seek_event; gst_event_replace (event_p, NULL); if (dvdemux->pending_segment) gst_event_unref (dvdemux->pending_segment); dvdemux->pending_segment = NULL; break; } default: break; } return ret; }