/* GStreamer * Copyright (C) 2004 Benjamin Otte * * 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. */ /** * SECTION:element-theoradec * @see_also: theoraenc, oggdemux * * This element decodes theora streams into raw video * Theora is a royalty-free * video codec maintained by the Xiph.org * Foundation, based on the VP3 codec. * * * Example pipeline * |[ * gst-launch -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! xvimagesink * ]| This example pipeline will decode an ogg stream and decodes the theora video. Refer to * the theoraenc example to create the ogg file. * * * Last reviewed on 2006-03-01 (0.10.4) */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include "gsttheoradec.h" #include #include #define GST_CAT_DEFAULT theoradec_debug GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT); #define THEORA_DEF_CROP TRUE enum { ARG_0, ARG_CROP }; static const GstElementDetails theora_dec_details = GST_ELEMENT_DETAILS ("Theora video decoder", "Codec/Decoder/Video", "decode raw theora streams to raw YUV video", "Benjamin Otte , " "Wim Taymans "); static GstStaticPadTemplate theora_dec_src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-raw-yuv, " "format = (fourcc) { I420, Y42B, Y444 }, " "framerate = (fraction) [0/1, MAX], " "width = (int) [ 1, MAX ], " "height = (int) [ 1, MAX ]") ); static GstStaticPadTemplate theora_dec_sink_factory = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-theora") ); GST_BOILERPLATE (GstTheoraDec, gst_theora_dec, GstElement, GST_TYPE_ELEMENT); static void theora_dec_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void theora_dec_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static gboolean theora_dec_sink_event (GstPad * pad, GstEvent * event); static gboolean theora_dec_setcaps (GstPad * pad, GstCaps * caps); static GstFlowReturn theora_dec_chain (GstPad * pad, GstBuffer * buffer); static GstStateChangeReturn theora_dec_change_state (GstElement * element, GstStateChange transition); static gboolean theora_dec_src_event (GstPad * pad, GstEvent * event); static gboolean theora_dec_src_query (GstPad * pad, GstQuery * query); static gboolean theora_dec_src_convert (GstPad * pad, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value); #if 0 static const GstFormat *theora_get_formats (GstPad * pad); #endif #if 0 static const GstEventMask *theora_get_event_masks (GstPad * pad); #endif static const GstQueryType *theora_get_query_types (GstPad * pad); static void gst_theora_dec_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 (&theora_dec_src_factory)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&theora_dec_sink_factory)); gst_element_class_set_details (element_class, &theora_dec_details); } static void gst_theora_dec_class_init (GstTheoraDecClass * klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); gobject_class->set_property = theora_dec_set_property; gobject_class->get_property = theora_dec_get_property; g_object_class_install_property (gobject_class, ARG_CROP, g_param_spec_boolean ("crop", "Crop", "Crop the image to the visible region", THEORA_DEF_CROP, (GParamFlags) G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstelement_class->change_state = theora_dec_change_state; GST_DEBUG_CATEGORY_INIT (theoradec_debug, "theoradec", 0, "Theora decoder"); } static void gst_theora_dec_init (GstTheoraDec * dec, GstTheoraDecClass * g_class) { dec->sinkpad = gst_pad_new_from_static_template (&theora_dec_sink_factory, "sink"); gst_pad_set_event_function (dec->sinkpad, theora_dec_sink_event); gst_pad_set_setcaps_function (dec->sinkpad, theora_dec_setcaps); gst_pad_set_chain_function (dec->sinkpad, theora_dec_chain); gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad); dec->srcpad = gst_pad_new_from_static_template (&theora_dec_src_factory, "src"); gst_pad_set_event_function (dec->srcpad, theora_dec_src_event); gst_pad_set_query_type_function (dec->srcpad, theora_get_query_types); gst_pad_set_query_function (dec->srcpad, theora_dec_src_query); gst_pad_use_fixed_caps (dec->srcpad); gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad); dec->crop = THEORA_DEF_CROP; dec->gather = NULL; dec->decode = NULL; dec->queued = NULL; dec->pendingevents = NULL; } static void gst_theora_dec_reset (GstTheoraDec * dec) { dec->need_keyframe = TRUE; dec->last_timestamp = -1; dec->discont = TRUE; dec->frame_nr = -1; dec->seqnum = gst_util_seqnum_next (); gst_segment_init (&dec->segment, GST_FORMAT_TIME); GST_OBJECT_LOCK (dec); dec->proportion = 1.0; dec->earliest_time = -1; GST_OBJECT_UNLOCK (dec); g_list_foreach (dec->queued, (GFunc) gst_mini_object_unref, NULL); g_list_free (dec->queued); dec->queued = NULL; g_list_foreach (dec->gather, (GFunc) gst_mini_object_unref, NULL); g_list_free (dec->gather); dec->gather = NULL; g_list_foreach (dec->decode, (GFunc) gst_mini_object_unref, NULL); g_list_free (dec->decode); dec->decode = NULL; g_list_foreach (dec->pendingevents, (GFunc) gst_mini_object_unref, NULL); g_list_free (dec->pendingevents); dec->pendingevents = NULL; if (dec->tags) { gst_tag_list_free (dec->tags); dec->tags = NULL; } } #if 0 static const GstFormat * theora_get_formats (GstPad * pad) { static GstFormat src_formats[] = { GST_FORMAT_DEFAULT, /* frames in this case */ GST_FORMAT_TIME, GST_FORMAT_BYTES, 0 }; static GstFormat sink_formats[] = { GST_FORMAT_DEFAULT, GST_FORMAT_TIME, 0 }; return (GST_PAD_IS_SRC (pad) ? src_formats : sink_formats); } #endif #if 0 static const GstEventMask * theora_get_event_masks (GstPad * pad) { static const GstEventMask theora_src_event_masks[] = { {GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_FLUSH}, {0,} }; return theora_src_event_masks; } #endif static const GstQueryType * theora_get_query_types (GstPad * pad) { static const GstQueryType theora_src_query_types[] = { GST_QUERY_POSITION, GST_QUERY_DURATION, GST_QUERY_CONVERT, 0 }; return theora_src_query_types; } static gboolean theora_dec_src_convert (GstPad * pad, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value) { gboolean res = TRUE; GstTheoraDec *dec; guint64 scale = 1; if (src_format == *dest_format) { *dest_value = src_value; return TRUE; } dec = GST_THEORA_DEC (gst_pad_get_parent (pad)); /* we need the info part before we can done something */ if (!dec->have_header) goto no_header; switch (src_format) { case GST_FORMAT_BYTES: switch (*dest_format) { case GST_FORMAT_DEFAULT: *dest_value = gst_util_uint64_scale_int (src_value, 8, dec->info.pic_height * dec->info.pic_width * dec->output_bpp); break; case GST_FORMAT_TIME: /* seems like a rather silly conversion, implement me if you like */ default: res = FALSE; } break; case GST_FORMAT_TIME: switch (*dest_format) { case GST_FORMAT_BYTES: scale = dec->output_bpp * (dec->info.pic_width * dec->info.pic_height) / 8; case GST_FORMAT_DEFAULT: *dest_value = scale * gst_util_uint64_scale (src_value, dec->info.fps_numerator, dec->info.fps_denominator * GST_SECOND); break; default: res = FALSE; } break; case GST_FORMAT_DEFAULT: switch (*dest_format) { case GST_FORMAT_TIME: *dest_value = gst_util_uint64_scale (src_value, GST_SECOND * dec->info.fps_denominator, dec->info.fps_numerator); break; case GST_FORMAT_BYTES: *dest_value = gst_util_uint64_scale_int (src_value, dec->output_bpp * dec->info.pic_width * dec->info.pic_height, 8); break; default: res = FALSE; } break; default: res = FALSE; } done: gst_object_unref (dec); return res; /* ERRORS */ no_header: { GST_DEBUG_OBJECT (dec, "no header yet, cannot convert"); res = FALSE; goto done; } } #if 0 static gboolean theora_dec_sink_convert (GstPad * pad, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value) { gboolean res = TRUE; GstTheoraDec *dec; if (src_format == *dest_format) { *dest_value = src_value; return TRUE; } dec = GST_THEORA_DEC (gst_pad_get_parent (pad)); /* we need the info part before we can done something */ if (!dec->have_header) goto no_header; switch (src_format) { case GST_FORMAT_DEFAULT: switch (*dest_format) { case GST_FORMAT_TIME: *dest_value = _theora_granule_start_time (dec, src_value); break; default: res = FALSE; } break; case GST_FORMAT_TIME: switch (*dest_format) { case GST_FORMAT_DEFAULT: { guint rest; /* framecount */ *dest_value = gst_util_uint64_scale (src_value, dec->info.fps_numerator, GST_SECOND * dec->info.fps_denominator); /* funny way of calculating granulepos in theora */ rest = *dest_value / dec->info.keyframe_granule_shift; *dest_value -= rest; *dest_value <<= dec->granule_shift; *dest_value += rest; break; } default: res = FALSE; break; } break; default: res = FALSE; } done: gst_object_unref (dec); return res; /* ERRORS */ no_header: { GST_DEBUG_OBJECT (dec, "no header yet, cannot convert"); res = FALSE; goto done; } } #endif static gboolean theora_dec_src_query (GstPad * pad, GstQuery * query) { GstTheoraDec *dec; gboolean res = FALSE; dec = GST_THEORA_DEC (gst_pad_get_parent (pad)); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_POSITION: { gint64 value; GstFormat format; gint64 time; /* parse format */ gst_query_parse_position (query, &format, NULL); time = dec->last_timestamp; time = gst_segment_to_stream_time (&dec->segment, GST_FORMAT_TIME, time); GST_LOG_OBJECT (dec, "query %p: our time: %" GST_TIME_FORMAT, query, GST_TIME_ARGS (time)); if (!(res = theora_dec_src_convert (pad, GST_FORMAT_TIME, time, &format, &value))) goto error; gst_query_set_position (query, format, value); GST_LOG_OBJECT (dec, "query %p: we return %" G_GINT64_FORMAT " (format %u)", query, value, format); break; } case GST_QUERY_DURATION: { /* forward to peer for total */ res = gst_pad_peer_query (dec->sinkpad, query); if (!res) goto error; 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 = theora_dec_src_convert (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, query); break; } done: gst_object_unref (dec); return res; /* ERRORS */ error: { GST_DEBUG_OBJECT (dec, "query failed"); goto done; } } static gboolean theora_dec_src_event (GstPad * pad, GstEvent * event) { gboolean res = TRUE; GstTheoraDec *dec; dec = GST_THEORA_DEC (gst_pad_get_parent (pad)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEEK: { GstFormat format, tformat; gdouble rate; GstEvent *real_seek; GstSeekFlags flags; GstSeekType cur_type, stop_type; gint64 cur, stop; gint64 tcur, tstop; guint32 seqnum; gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur, &stop_type, &stop); seqnum = gst_event_get_seqnum (event); gst_event_unref (event); /* we have to ask our peer to seek to time here as we know * nothing about how to generate a granulepos from the src * formats or anything. * * First bring the requested format to time */ tformat = GST_FORMAT_TIME; if (!(res = theora_dec_src_convert (pad, format, cur, &tformat, &tcur))) goto convert_error; if (!(res = theora_dec_src_convert (pad, format, stop, &tformat, &tstop))) goto convert_error; /* then seek with time on the peer */ real_seek = gst_event_new_seek (rate, GST_FORMAT_TIME, flags, cur_type, tcur, stop_type, tstop); gst_event_set_seqnum (real_seek, seqnum); res = gst_pad_push_event (dec->sinkpad, real_seek); break; } case GST_EVENT_QOS: { gdouble proportion; GstClockTimeDiff diff; GstClockTime timestamp; gst_event_parse_qos (event, &proportion, &diff, ×tamp); /* we cannot randomly skip frame decoding since we don't have * B frames. we can however use the timestamp and diff to not * push late frames. This would at least save us the time to * crop/memcpy the data. */ GST_OBJECT_LOCK (dec); dec->proportion = proportion; dec->earliest_time = timestamp + diff; GST_OBJECT_UNLOCK (dec); GST_DEBUG_OBJECT (dec, "got QoS %" GST_TIME_FORMAT ", %" G_GINT64_FORMAT, GST_TIME_ARGS (timestamp), diff); res = gst_pad_push_event (dec->sinkpad, event); break; } default: res = gst_pad_push_event (dec->sinkpad, event); break; } done: gst_object_unref (dec); return res; /* ERRORS */ convert_error: { GST_DEBUG_OBJECT (dec, "could not convert format"); goto done; } } static gboolean theora_dec_sink_event (GstPad * pad, GstEvent * event) { gboolean ret = FALSE; GstTheoraDec *dec; dec = GST_THEORA_DEC (gst_pad_get_parent (pad)); GST_LOG_OBJECT (dec, "handling event"); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_START: ret = gst_pad_push_event (dec->srcpad, event); break; case GST_EVENT_FLUSH_STOP: gst_theora_dec_reset (dec); ret = gst_pad_push_event (dec->srcpad, event); break; case GST_EVENT_EOS: ret = gst_pad_push_event (dec->srcpad, event); break; 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 format */ if (format != GST_FORMAT_TIME) goto newseg_wrong_format; GST_DEBUG_OBJECT (dec, "newsegment: update %d, rate %g, arate %g, start %" GST_TIME_FORMAT ", stop %" GST_TIME_FORMAT ", time %" GST_TIME_FORMAT, update, rate, arate, GST_TIME_ARGS (start), GST_TIME_ARGS (stop), GST_TIME_ARGS (time)); /* now configure the values */ gst_segment_set_newsegment_full (&dec->segment, update, rate, arate, format, start, stop, time); dec->seqnum = gst_event_get_seqnum (event); /* We don't forward this unless/until the decoder is initialised */ if (dec->have_header) { ret = gst_pad_push_event (dec->srcpad, event); } else { dec->pendingevents = g_list_append (dec->pendingevents, event); ret = TRUE; } break; } case GST_EVENT_TAG: { if (dec->have_header) /* and forward */ ret = gst_pad_push_event (dec->srcpad, event); else { /* store it to send once we're initialized */ dec->pendingevents = g_list_append (dec->pendingevents, event); ret = TRUE; } break; } default: ret = gst_pad_push_event (dec->srcpad, event); break; } done: gst_object_unref (dec); return ret; /* ERRORS */ newseg_wrong_format: { GST_DEBUG_OBJECT (dec, "received non TIME newsegment"); gst_event_unref (event); goto done; } } static gboolean theora_dec_setcaps (GstPad * pad, GstCaps * caps) { GstTheoraDec *dec; GstStructure *s; const GValue *codec_data; dec = GST_THEORA_DEC (gst_pad_get_parent (pad)); s = gst_caps_get_structure (caps, 0); /* parse the par, this overrides the encoded par */ dec->have_par = gst_structure_get_fraction (s, "pixel-aspect-ratio", &dec->par_num, &dec->par_den); if ((codec_data = gst_structure_get_value (s, "codec_data"))) { if (G_VALUE_TYPE (codec_data) == GST_TYPE_BUFFER) { GstBuffer *buffer; guint8 *data; guint size; guint offset; buffer = gst_value_get_buffer (codec_data); offset = 0; size = GST_BUFFER_SIZE (buffer); data = GST_BUFFER_DATA (buffer); while (size > 2) { guint psize; GstBuffer *buf; psize = (data[0] << 8) | data[1]; /* skip header */ data += 2; size -= 2; offset += 2; /* make sure we don't read too much */ psize = MIN (psize, size); buf = gst_buffer_create_sub (buffer, offset, psize); /* first buffer is a discont buffer */ if (offset == 2) GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT); /* now feed it to the decoder we can ignore the error */ theora_dec_chain (pad, buf); /* skip the data */ size -= psize; data += psize; offset += psize; } } } gst_object_unref (dec); return TRUE; } static GstFlowReturn theora_handle_comment_packet (GstTheoraDec * dec, ogg_packet * packet) { gchar *encoder = NULL; GstBuffer *buf; GstTagList *list; GST_DEBUG_OBJECT (dec, "parsing comment packet"); buf = gst_buffer_new (); GST_BUFFER_SIZE (buf) = packet->bytes; GST_BUFFER_DATA (buf) = packet->packet; list = gst_tag_list_from_vorbiscomment_buffer (buf, (guint8 *) "\201theora", 7, &encoder); gst_buffer_unref (buf); if (!list) { GST_ERROR_OBJECT (dec, "couldn't decode comments"); list = gst_tag_list_new (); } if (encoder) { gst_tag_list_add (list, GST_TAG_MERGE_REPLACE, GST_TAG_ENCODER, encoder, NULL); g_free (encoder); } gst_tag_list_add (list, GST_TAG_MERGE_REPLACE, GST_TAG_ENCODER_VERSION, dec->info.version_major, GST_TAG_VIDEO_CODEC, "Theora", NULL); if (dec->info.target_bitrate > 0) { gst_tag_list_add (list, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE, dec->info.target_bitrate, GST_TAG_NOMINAL_BITRATE, dec->info.target_bitrate, NULL); } dec->tags = list; return GST_FLOW_OK; } static GstFlowReturn theora_handle_type_packet (GstTheoraDec * dec, ogg_packet * packet) { GstCaps *caps; gint par_num, par_den; GstFlowReturn ret = GST_FLOW_OK; GList *walk; guint32 fourcc; GST_DEBUG_OBJECT (dec, "fps %d/%d, PAR %d/%d", dec->info.fps_numerator, dec->info.fps_denominator, dec->info.aspect_numerator, dec->info.aspect_denominator); /* calculate par * the info.aspect_* values reflect PAR; * 0:x and x:0 are allowed and can be interpreted as 1:1. */ if (dec->have_par) { /* we had a par on the sink caps, override the encoded par */ GST_DEBUG_OBJECT (dec, "overriding with input PAR"); par_num = dec->par_num; par_den = dec->par_den; } else { /* take encoded par */ par_num = dec->info.aspect_numerator; par_den = dec->info.aspect_denominator; } if (par_num == 0 || par_den == 0) { par_num = par_den = 1; } /* theora has: * * width/height : dimension of the encoded frame * pic_width/pic_height : dimension of the visible part * pic_x/pic_y : offset in encoded frame where visible part starts */ GST_DEBUG_OBJECT (dec, "dimension %dx%d, PAR %d/%d", dec->info.pic_width, dec->info.pic_height, par_num, par_den); GST_DEBUG_OBJECT (dec, "frame dimension %dx%d, offset %d:%d", dec->info.pic_width, dec->info.pic_height, dec->info.pic_x, dec->info.pic_y); if (dec->info.pixel_fmt == TH_PF_420) { dec->output_bpp = 12; /* Average bits per pixel. */ fourcc = GST_MAKE_FOURCC ('I', '4', '2', '0'); } else if (dec->info.pixel_fmt == TH_PF_422) { dec->output_bpp = 16; fourcc = GST_MAKE_FOURCC ('Y', '4', '2', 'B'); } else if (dec->info.pixel_fmt == TH_PF_444) { dec->output_bpp = 24; fourcc = GST_MAKE_FOURCC ('Y', '4', '4', '4'); } else { GST_ERROR_OBJECT (dec, "Invalid pixel format %d", dec->info.pixel_fmt); return GST_FLOW_ERROR; } if (dec->crop) { dec->width = dec->info.pic_width; dec->height = dec->info.pic_height; dec->offset_x = dec->info.pic_x; dec->offset_y = dec->info.pic_y; /* Ensure correct offsets in chroma for formats that need it * by rounding the offset. libtheora will add proper pixels, * so no need to handle them ourselves. */ if (dec->offset_x & 1 && dec->info.pixel_fmt != TH_PF_444) { dec->offset_x--; dec->width++; } if (dec->offset_y & 1 && dec->info.pixel_fmt == TH_PF_420) { dec->offset_y--; dec->height++; } } else { /* no cropping, use the encoded dimensions */ dec->width = dec->info.frame_width; dec->height = dec->info.frame_height; dec->offset_x = 0; dec->offset_y = 0; } GST_DEBUG_OBJECT (dec, "after fixup frame dimension %dx%d, offset %d:%d", dec->width, dec->height, dec->offset_x, dec->offset_y); /* done */ dec->decoder = th_decode_alloc (&dec->info, dec->setup); caps = gst_caps_new_simple ("video/x-raw-yuv", "format", GST_TYPE_FOURCC, fourcc, "framerate", GST_TYPE_FRACTION, dec->info.fps_numerator, dec->info.fps_denominator, "pixel-aspect-ratio", GST_TYPE_FRACTION, par_num, par_den, "width", G_TYPE_INT, dec->width, "height", G_TYPE_INT, dec->height, NULL); gst_pad_set_caps (dec->srcpad, caps); gst_caps_unref (caps); dec->have_header = TRUE; if (dec->pendingevents) { for (walk = dec->pendingevents; walk; walk = g_list_next (walk)) gst_pad_push_event (dec->srcpad, GST_EVENT_CAST (walk->data)); g_list_free (dec->pendingevents); dec->pendingevents = NULL; } if (dec->tags) { gst_element_found_tags_for_pad (GST_ELEMENT_CAST (dec), dec->srcpad, dec->tags); dec->tags = NULL; } return ret; } static GstFlowReturn theora_handle_header_packet (GstTheoraDec * dec, ogg_packet * packet) { GstFlowReturn res; int ret; GST_DEBUG_OBJECT (dec, "parsing header packet"); ret = th_decode_headerin (&dec->info, &dec->comment, &dec->setup, packet); if (ret < 0) goto header_read_error; switch (packet->packet[0]) { case 0x81: res = theora_handle_comment_packet (dec, packet); break; case 0x82: res = theora_handle_type_packet (dec, packet); break; default: /* ignore */ g_warning ("unknown theora header packet found"); case 0x80: /* nothing special, this is the identification header */ res = GST_FLOW_OK; break; } return res; /* ERRORS */ header_read_error: { GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE, (NULL), ("couldn't read header packet")); return GST_FLOW_ERROR; } } /* returns TRUE if buffer is within segment, else FALSE. * if Buffer is on segment border, it's timestamp and duration will be clipped */ static gboolean clip_buffer (GstTheoraDec * 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 theora_dec_push_forward (GstTheoraDec * dec, GstBuffer * buf) { GstFlowReturn result = GST_FLOW_OK; if (clip_buffer (dec, buf)) { if (dec->discont) { GST_LOG_OBJECT (dec, "setting DISCONT"); GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT); dec->discont = FALSE; } result = gst_pad_push (dec->srcpad, buf); } else { gst_buffer_unref (buf); } return result; } static GstFlowReturn theora_dec_push_reverse (GstTheoraDec * dec, GstBuffer * buf) { GstFlowReturn result = GST_FLOW_OK; dec->queued = g_list_prepend (dec->queued, buf); return result; } /* Allocate buffer and copy image data into Y444 format */ static GstFlowReturn theora_handle_image (GstTheoraDec * dec, th_ycbcr_buffer buf, GstBuffer ** out) { gint width, height, stride; GstFlowReturn result; int i, plane; GstVideoFormat format; guint8 *dest, *src; switch (dec->info.pixel_fmt) { case TH_PF_444: format = GST_VIDEO_FORMAT_Y444; break; case TH_PF_420: format = GST_VIDEO_FORMAT_I420; break; case TH_PF_422: format = GST_VIDEO_FORMAT_Y42B; break; default: g_assert_not_reached (); } result = gst_pad_alloc_buffer_and_set_caps (dec->srcpad, GST_BUFFER_OFFSET_NONE, gst_video_format_get_size (format, dec->width, dec->height), GST_PAD_CAPS (dec->srcpad), out); if (G_UNLIKELY (result != GST_FLOW_OK)) { GST_DEBUG_OBJECT (dec, "could not get buffer, reason: %s", gst_flow_get_name (result)); return result; } for (plane = 0; plane < 3; plane++) { width = gst_video_format_get_component_width (format, plane, dec->width); height = gst_video_format_get_component_width (format, plane, dec->height); stride = gst_video_format_get_row_stride (format, plane, dec->width); dest = GST_BUFFER_DATA (*out) + gst_video_format_get_component_offset (format, plane, dec->width, dec->height); src = buf[plane].data; src += ((height == dec->height) ? dec->offset_y : dec->offset_y / 2) * buf[plane].stride; src += (width == dec->width) ? dec->offset_x : dec->offset_x / 2; for (i = 0; i < height; i++) { memcpy (dest, src, width); dest += stride; src += buf[plane].stride; } } return GST_FLOW_OK; } static GstFlowReturn theora_handle_data_packet (GstTheoraDec * dec, ogg_packet * packet, GstClockTime outtime, GstClockTime outdur) { /* normal data packet */ th_ycbcr_buffer buf; GstBuffer *out; gboolean keyframe; GstFlowReturn result; ogg_int64_t gp; if (G_UNLIKELY (!dec->have_header)) goto not_initialized; /* get timestamp and durations */ if (outtime == -1) outtime = dec->last_timestamp; if (outdur == -1) outdur = gst_util_uint64_scale_int (GST_SECOND, dec->info.fps_denominator, dec->info.fps_numerator); /* calculate expected next timestamp */ if (outtime != -1 && outdur != -1) dec->last_timestamp = outtime + outdur; /* the second most significant bit of the first data byte is cleared * for keyframes. We can only check it if it's not a zero-length packet. */ keyframe = packet->bytes && ((packet->packet[0] & 0x40) == 0); if (G_UNLIKELY (keyframe)) { GST_DEBUG_OBJECT (dec, "we have a keyframe"); dec->need_keyframe = FALSE; } else if (G_UNLIKELY (dec->need_keyframe)) { goto dropping; } GST_DEBUG_OBJECT (dec, "parsing data packet"); /* this does the decoding */ if (G_UNLIKELY (th_decode_packetin (dec->decoder, packet, &gp) < 0)) goto decode_error; if (outtime != -1) { gboolean need_skip; GstClockTime qostime; /* qos needs to be done on running time */ qostime = gst_segment_to_running_time (&dec->segment, GST_FORMAT_TIME, outtime); GST_OBJECT_LOCK (dec); /* check for QoS, don't perform the last steps of getting and * pushing the buffers that are known to be late. */ need_skip = dec->earliest_time != -1 && qostime <= dec->earliest_time; GST_OBJECT_UNLOCK (dec); if (need_skip) goto dropping_qos; } /* this does postprocessing and set up the decoded frame * pointers in our yuv variable */ if (G_UNLIKELY (th_decode_ycbcr_out (dec->decoder, buf) < 0)) goto no_yuv; if (G_UNLIKELY ((buf[0].width != dec->info.frame_width) || (buf[0].height != dec->info.frame_height))) goto wrong_dimensions; result = theora_handle_image (dec, buf, &out); if (result != GST_FLOW_OK) return result; GST_BUFFER_OFFSET (out) = dec->frame_nr; if (dec->frame_nr != -1) dec->frame_nr++; GST_BUFFER_OFFSET_END (out) = dec->frame_nr; GST_BUFFER_TIMESTAMP (out) = outtime; GST_BUFFER_DURATION (out) = outdur; if (dec->segment.rate >= 0.0) result = theora_dec_push_forward (dec, out); else result = theora_dec_push_reverse (dec, out); return result; /* ERRORS */ not_initialized: { GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE, (NULL), ("no header sent yet")); return GST_FLOW_ERROR; } dropping: { GST_WARNING_OBJECT (dec, "dropping frame because we need a keyframe"); dec->discont = TRUE; return GST_FLOW_OK; } dropping_qos: { if (dec->frame_nr != -1) dec->frame_nr++; dec->discont = TRUE; GST_WARNING_OBJECT (dec, "dropping frame because of QoS"); return GST_FLOW_OK; } decode_error: { GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE, (NULL), ("theora decoder did not decode data packet")); return GST_FLOW_ERROR; } no_yuv: { GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE, (NULL), ("couldn't read out YUV image")); return GST_FLOW_ERROR; } wrong_dimensions: { GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, FORMAT, (NULL), ("dimensions of image do not match header")); return GST_FLOW_ERROR; } } static GstFlowReturn theora_dec_decode_buffer (GstTheoraDec * dec, GstBuffer * buf) { ogg_packet packet; GstFlowReturn result = GST_FLOW_OK; GstClockTime timestamp, duration; /* make ogg_packet out of the buffer */ packet.packet = GST_BUFFER_DATA (buf); packet.bytes = GST_BUFFER_SIZE (buf); packet.granulepos = -1; packet.packetno = 0; /* we don't really care */ packet.b_o_s = dec->have_header ? 0 : 1; /* EOS does not matter for the decoder */ packet.e_o_s = 0; GST_LOG_OBJECT (dec, "decode buffer of size %ld", packet.bytes); /* save last seem timestamp for interpolating the next timestamps using the * framerate when we need to */ timestamp = GST_BUFFER_TIMESTAMP (buf); duration = GST_BUFFER_DURATION (buf); GST_DEBUG_OBJECT (dec, "header=%02x, outtime=%" GST_TIME_FORMAT, packet.bytes ? packet.packet[0] : -1, GST_TIME_ARGS (timestamp)); /* switch depending on packet type. A zero byte packet is always a data * packet; we don't dereference it in that case. */ if (packet.bytes && packet.packet[0] & 0x80) { if (dec->have_header) { GST_WARNING_OBJECT (GST_OBJECT (dec), "Ignoring header"); goto done; } result = theora_handle_header_packet (dec, &packet); } else { result = theora_handle_data_packet (dec, &packet, timestamp, duration); } done: return result; } /* For reverse playback we use a technique that can be used for * any keyframe based video codec. * * Input: * Buffer decoding order: 7 8 9 4 5 6 1 2 3 EOS * Keyframe flag: K K * Discont flag: D D D * * - Each Discont marks a discont in the decoding order. * - The keyframes mark where we can start decoding. * * First we prepend incomming buffers to the gather queue, whenever we receive * a discont, we flush out the gather queue. * * The above data will be accumulated in the gather queue like this: * * gather queue: 9 8 7 * D * * Whe buffer 4 is received (with a DISCONT), we flush the gather queue like * this: * * while (gather) * take head of queue and prepend to decode queue. * if we copied a keyframe, decode the decode queue. * * After we flushed the gather queue, we add 4 to the (now empty) gather queue. * We get the following situation: * * gather queue: 4 * decode queue: 7 8 9 * * After we received 5 (Keyframe) and 6: * * gather queue: 6 5 4 * decode queue: 7 8 9 * * When we receive 1 (DISCONT) which triggers a flush of the gather queue: * * Copy head of the gather queue (6) to decode queue: * * gather queue: 5 4 * decode queue: 6 7 8 9 * * Copy head of the gather queue (5) to decode queue. This is a keyframe so we * can start decoding. * * gather queue: 4 * decode queue: 5 6 7 8 9 * * Decode frames in decode queue, store raw decoded data in output queue, we * can take the head of the decode queue and prepend the decoded result in the * output queue: * * gather queue: 4 * decode queue: * output queue: 9 8 7 6 5 * * Now output all the frames in the output queue, picking a frame from the * head of the queue. * * Copy head of the gather queue (4) to decode queue, we flushed the gather * queue and can now store input buffer in the gather queue: * * gather queue: 1 * decode queue: 4 * * When we receive EOS, the queue looks like: * * gather queue: 3 2 1 * decode queue: 4 * * Fill decode queue, first keyframe we copy is 2: * * gather queue: 1 * decode queue: 2 3 4 * * Decoded output: * * gather queue: 1 * decode queue: * output queue: 4 3 2 * * Leftover buffer 1 cannot be decoded and must be discarded. */ static GstFlowReturn theora_dec_flush_decode (GstTheoraDec * dec) { GstFlowReturn res = GST_FLOW_OK; while (dec->decode) { GstBuffer *buf = GST_BUFFER_CAST (dec->decode->data); GST_DEBUG_OBJECT (dec, "decoding buffer %p, ts %" GST_TIME_FORMAT, buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf))); /* decode buffer, prepend to output queue */ res = theora_dec_decode_buffer (dec, buf); /* don't need it anymore now */ gst_buffer_unref (buf); dec->decode = g_list_delete_link (dec->decode, dec->decode); } while (dec->queued) { GstBuffer *buf = GST_BUFFER_CAST (dec->queued->data); /* iterate ouput queue an push downstream */ res = gst_pad_push (dec->srcpad, buf); dec->queued = g_list_delete_link (dec->queued, dec->queued); } return res; } static GstFlowReturn theora_dec_chain_reverse (GstTheoraDec * dec, gboolean discont, GstBuffer * buf) { GstFlowReturn res = GST_FLOW_OK; /* if we have a discont, move buffers to the decode list */ if (G_UNLIKELY (discont)) { GST_DEBUG_OBJECT (dec, "received discont,gathering buffers"); while (dec->gather) { GstBuffer *gbuf; guint8 *data; gbuf = GST_BUFFER_CAST (dec->gather->data); /* remove from the gather list */ dec->gather = g_list_delete_link (dec->gather, dec->gather); /* copy to decode queue */ dec->decode = g_list_prepend (dec->decode, gbuf); /* if we copied a keyframe, flush and decode the decode queue */ data = GST_BUFFER_DATA (gbuf); if ((data[0] & 0x40) == 0) { GST_DEBUG_OBJECT (dec, "copied keyframe"); res = theora_dec_flush_decode (dec); } } } /* add buffer to gather queue */ GST_DEBUG_OBJECT (dec, "gathering buffer %p, size %u", buf, GST_BUFFER_SIZE (buf)); dec->gather = g_list_prepend (dec->gather, buf); return res; } static GstFlowReturn theora_dec_chain_forward (GstTheoraDec * dec, gboolean discont, GstBuffer * buffer) { GstFlowReturn result; result = theora_dec_decode_buffer (dec, buffer); gst_buffer_unref (buffer); return result; } static GstFlowReturn theora_dec_chain (GstPad * pad, GstBuffer * buf) { GstTheoraDec *dec; GstFlowReturn res; gboolean discont; dec = GST_THEORA_DEC (gst_pad_get_parent (pad)); /* peel of DISCONT flag */ discont = GST_BUFFER_IS_DISCONT (buf); /* resync on DISCONT */ if (G_UNLIKELY (discont)) { GST_DEBUG_OBJECT (dec, "received DISCONT buffer"); dec->need_keyframe = TRUE; dec->last_timestamp = -1; dec->discont = TRUE; } if (dec->segment.rate > 0.0) res = theora_dec_chain_forward (dec, discont, buf); else res = theora_dec_chain_reverse (dec, discont, buf); gst_object_unref (dec); return res; } static GstStateChangeReturn theora_dec_change_state (GstElement * element, GstStateChange transition) { GstTheoraDec *dec = GST_THEORA_DEC (element); GstStateChangeReturn ret; switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: th_info_clear (&dec->info); th_comment_clear (&dec->comment); GST_DEBUG_OBJECT (dec, "Setting have_header to FALSE in READY->PAUSED"); dec->have_header = FALSE; dec->have_par = FALSE; gst_theora_dec_reset (dec); break; case GST_STATE_CHANGE_PAUSED_TO_PLAYING: break; default: break; } ret = parent_class->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PLAYING_TO_PAUSED: break; case GST_STATE_CHANGE_PAUSED_TO_READY: th_info_clear (&dec->info); th_comment_clear (&dec->comment); th_setup_free (dec->setup); dec->setup = NULL; th_decode_free (dec->decoder); dec->decoder = NULL; gst_theora_dec_reset (dec); break; case GST_STATE_CHANGE_READY_TO_NULL: break; default: break; } return ret; } static void theora_dec_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstTheoraDec *dec = GST_THEORA_DEC (object); switch (prop_id) { case ARG_CROP: dec->crop = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void theora_dec_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstTheoraDec *dec = GST_THEORA_DEC (object); switch (prop_id) { case ARG_CROP: g_value_set_boolean (value, dec->crop); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } }