gstreamer/gst/ivfparse/gstivfparse.c
Gwenole Beauchesne abadffd4d8 ivfparse: detect and propagate resolution changes.
Detect resolution changes on key frames, and propagate the resulting
caps to the src pad. Only the uncompressed data chunk is decoded, so
avoid using the new VP8 bitstream parsing library for now.

Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
2014-04-18 18:31:15 +02:00

385 lines
11 KiB
C

/* -*- Mode: c; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* GStreamer IVF parser
* (c) 2010 Opera Software ASA, Philip Jägenstedt <philipj@opera.com>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/* Snippets of source code copied freely from wavparse,
* aviparse and auparse. */
/* File format as written by libvpx ivfenc:
*
* All fields are little endian.
*
* 32 byte file header format:
*
* 0-3: "DKIF" (file magic)
* 4-5: version (uint16)
* 6-7: header size (uint16)
* 8-11: "VP80" (FOURCC)
* 12-13: width (uint16)
* 14-15: height (uint16)
* 16-19: framerate numerator (uint32)
* 20-23: framerate denominator (uint32)
* 24-27: frame count (uint32)
* 28-31: unused
*
* 12 byte frame header format:
*
* 0-3: frame size in bytes (uint32)
* 4-11: time stamp (uint64)
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "gstivfparse.h"
#define IVF_FILE_HEADER_SIZE 32
#define IVF_FRAME_HEADER_SIZE 12
GST_DEBUG_CATEGORY_STATIC (gst_ivf_parse_debug);
#define GST_CAT_DEFAULT gst_ivf_parse_debug
/* sink and src pad templates */
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-ivf")
);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("ANY")
);
#define gst_ivf_parse_parent_class parent_class
G_DEFINE_TYPE (GstIvfParse, gst_ivf_parse, GST_TYPE_BASE_PARSE);
static void gst_ivf_parse_finalize (GObject * object);
static gboolean gst_ivf_parse_start (GstBaseParse * parse);
static gboolean gst_ivf_parse_stop (GstBaseParse * parse);
static GstFlowReturn
gst_ivf_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize);
/* initialize the ivfparse's class */
static void
gst_ivf_parse_class_init (GstIvfParseClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseParseClass *gstbaseparse_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbaseparse_class = (GstBaseParseClass *) klass;
gobject_class->finalize = gst_ivf_parse_finalize;
gstbaseparse_class->start = gst_ivf_parse_start;
gstbaseparse_class->stop = gst_ivf_parse_stop;
gstbaseparse_class->handle_frame = gst_ivf_parse_handle_frame;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_static_metadata (gstelement_class,
"IVF parser", "Codec/Demuxer",
"Demuxes a IVF stream", "Philip Jägenstedt <philipj@opera.com>");
/* debug category for filtering log messages */
GST_DEBUG_CATEGORY_INIT (gst_ivf_parse_debug, "ivfparse", 0, "IVF parser");
}
static void
gst_ivf_parse_reset (GstIvfParse * ivf)
{
ivf->state = GST_IVF_PARSE_START;
ivf->width = 0;
ivf->height = 0;
ivf->fps_n = 0;
ivf->fps_d = 0;
ivf->update_caps = FALSE;
}
/* initialize the new element
* instantiate pads and add them to element
* set pad calback functions
* initialize instance structure
*/
static void
gst_ivf_parse_init (GstIvfParse * ivf)
{
gst_ivf_parse_reset (ivf);
}
static void
gst_ivf_parse_finalize (GObject * object)
{
GstIvfParse *const ivf = GST_IVF_PARSE (object);
GST_DEBUG_OBJECT (ivf, "finalizing");
gst_ivf_parse_reset (ivf);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_ivf_parse_start (GstBaseParse * parse)
{
GstIvfParse *const ivf = GST_IVF_PARSE (parse);
gst_ivf_parse_reset (ivf);
/* Minimal file header size needed at start */
gst_base_parse_set_min_frame_size (parse, IVF_FILE_HEADER_SIZE);
/* No sync code to detect frame boundaries */
gst_base_parse_set_syncable (parse, FALSE);
return TRUE;
}
static gboolean
gst_ivf_parse_stop (GstBaseParse * parse)
{
GstIvfParse *const ivf = GST_IVF_PARSE (parse);
gst_ivf_parse_reset (ivf);
return TRUE;
}
static void
gst_ivf_parse_set_size (GstIvfParse * ivf, guint width, guint height)
{
if (ivf->width != width || ivf->height != height) {
GST_INFO_OBJECT (ivf, "resolution changed to %ux%u", width, height);
ivf->width = width;
ivf->height = height;
ivf->update_caps = TRUE;
}
}
static void
gst_ivf_parse_set_framerate (GstIvfParse * ivf, guint fps_n, guint fps_d)
{
if (ivf->fps_n != fps_n || ivf->fps_d != fps_d) {
GST_INFO_OBJECT (ivf, "framerate changed to %u/%u", fps_n, fps_d);
ivf->fps_n = fps_n;
ivf->fps_d = fps_d;
ivf->update_caps = TRUE;
}
}
static void
gst_ivf_parse_update_src_caps (GstIvfParse * ivf)
{
GstCaps *caps;
if (!ivf->update_caps &&
G_LIKELY (gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (ivf))))
return;
ivf->update_caps = FALSE;
/* Create src pad caps */
caps = gst_caps_new_simple ("video/x-vp8", "width", G_TYPE_INT, ivf->width,
"height", G_TYPE_INT, ivf->height, NULL);
if (ivf->fps_n > 0 && ivf->fps_d > 0) {
gst_base_parse_set_frame_rate (GST_BASE_PARSE_CAST (ivf),
ivf->fps_n, ivf->fps_d, 0, 0);
gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION, ivf->fps_n,
ivf->fps_d, NULL);
}
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (ivf), caps);
gst_caps_unref (caps);
}
static GstFlowReturn
gst_ivf_parse_handle_frame_start (GstIvfParse * ivf, GstBaseParseFrame * frame,
gint * skipsize)
{
GstBuffer *const buffer = frame->buffer;
GstMapInfo map;
GstFlowReturn ret = GST_FLOW_OK;
gst_buffer_map (buffer, &map, GST_MAP_READ);
if (map.size >= IVF_FILE_HEADER_SIZE) {
guint32 magic = GST_READ_UINT32_LE (map.data);
guint16 version = GST_READ_UINT16_LE (map.data + 4);
guint16 header_size = GST_READ_UINT16_LE (map.data + 6);
guint32 fourcc = GST_READ_UINT32_LE (map.data + 8);
guint16 width = GST_READ_UINT16_LE (map.data + 12);
guint16 height = GST_READ_UINT16_LE (map.data + 14);
guint32 fps_n = GST_READ_UINT32_LE (map.data + 16);
guint32 fps_d = GST_READ_UINT32_LE (map.data + 20);
#ifndef GST_DISABLE_GST_DEBUG
guint32 num_frames = GST_READ_UINT32_LE (map.data + 24);
#endif
if (magic != GST_MAKE_FOURCC ('D', 'K', 'I', 'F') ||
version != 0 || header_size != 32 ||
fourcc != GST_MAKE_FOURCC ('V', 'P', '8', '0')) {
GST_ELEMENT_ERROR (ivf, STREAM, WRONG_TYPE, (NULL), (NULL));
ret = GST_FLOW_ERROR;
goto end;
}
gst_ivf_parse_set_size (ivf, width, height);
gst_ivf_parse_set_framerate (ivf, fps_n, fps_d);
GST_LOG_OBJECT (ivf, "Stream has %d frames", num_frames);
/* move along */
ivf->state = GST_IVF_PARSE_DATA;
gst_base_parse_set_min_frame_size (GST_BASE_PARSE_CAST (ivf),
IVF_FRAME_HEADER_SIZE);
*skipsize = IVF_FILE_HEADER_SIZE;
} else {
GST_LOG_OBJECT (ivf, "Header data not yet available.");
*skipsize = 0;
}
end:
gst_buffer_unmap (buffer, &map);
return ret;
}
static GstFlowReturn
gst_ivf_parse_handle_frame_data (GstIvfParse * ivf, GstBaseParseFrame * frame,
gint * skipsize)
{
GstBuffer *const buffer = frame->buffer;
GstMapInfo map;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *out_buffer;
gst_buffer_map (buffer, &map, GST_MAP_READ);
if (map.size >= IVF_FILE_HEADER_SIZE) {
guint32 frame_size = GST_READ_UINT32_LE (map.data);
guint64 frame_pts = GST_READ_UINT64_LE (map.data + 4);
GST_LOG_OBJECT (ivf,
"Read frame header: size %u, pts %" G_GUINT64_FORMAT, frame_size,
frame_pts);
if (map.size < IVF_FRAME_HEADER_SIZE + frame_size) {
gst_base_parse_set_min_frame_size (GST_BASE_PARSE_CAST (ivf),
IVF_FRAME_HEADER_SIZE + frame_size);
gst_buffer_unmap (buffer, &map);
*skipsize = 0;
goto end;
}
gst_buffer_unmap (buffer, &map);
/* Eventually, we would need the buffer memory in a merged state anyway */
out_buffer = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_FLAGS |
GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_META |
GST_BUFFER_COPY_MEMORY | GST_BUFFER_COPY_MERGE,
IVF_FRAME_HEADER_SIZE, frame_size);
if (!out_buffer) {
GST_ERROR_OBJECT (ivf, "Failed to copy frame buffer");
ret = GST_FLOW_ERROR;
*skipsize = IVF_FRAME_HEADER_SIZE + frame_size;
goto end;
}
gst_buffer_replace (&frame->out_buffer, out_buffer);
gst_buffer_unref (out_buffer);
/* Detect resolution changes on key frames */
if (gst_buffer_map (frame->out_buffer, &map, GST_MAP_READ)) {
guint32 frame_tag, width, height;
frame_tag = GST_READ_UINT24_LE (map.data);
if (!(frame_tag & 0x01) && map.size >= 10) { /* key frame */
GST_DEBUG_OBJECT (ivf, "key frame detected");
width = GST_READ_UINT16_LE (map.data + 6) & 0x3fff;
height = GST_READ_UINT16_LE (map.data + 8) & 0x3fff;
gst_ivf_parse_set_size (ivf, width, height);
}
gst_buffer_unmap (frame->out_buffer, &map);
}
if (ivf->fps_n > 0) {
GST_BUFFER_TIMESTAMP (out_buffer) =
gst_util_uint64_scale_int (GST_SECOND * frame_pts, ivf->fps_d,
ivf->fps_n);
}
gst_ivf_parse_update_src_caps (ivf);
ret = gst_base_parse_finish_frame (GST_BASE_PARSE_CAST (ivf), frame,
IVF_FRAME_HEADER_SIZE + frame_size);
*skipsize = 0;
} else {
GST_LOG_OBJECT (ivf, "Frame data not yet available.");
gst_buffer_unmap (buffer, &map);
*skipsize = 0;
}
end:
return ret;
}
static GstFlowReturn
gst_ivf_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize)
{
GstIvfParse *const ivf = GST_IVF_PARSE (parse);
switch (ivf->state) {
case GST_IVF_PARSE_START:
return gst_ivf_parse_handle_frame_start (ivf, frame, skipsize);
case GST_IVF_PARSE_DATA:
return gst_ivf_parse_handle_frame_data (ivf, frame, skipsize);
default:
break;
}
g_assert_not_reached ();
return GST_FLOW_ERROR;
}
/* entry point to initialize the plug-in */
static gboolean
ivfparse_init (GstPlugin * ivfparse)
{
/* register parser element */
if (!gst_element_register (ivfparse, "ivfparse", GST_RANK_PRIMARY,
GST_TYPE_IVF_PARSE))
return FALSE;
return TRUE;
}
/* gstreamer looks for this structure to register plugins */
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
ivfparse,
"IVF parser",
ivfparse_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)