mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-08 13:18:52 +00:00
Also: - unref buffers after gst_buffer_span - fix scanning of header if header data is split over several buffers Fixes bug #595700.
334 lines
9.3 KiB
C
334 lines
9.3 KiB
C
/* GStreamer
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-pnmdec
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*
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* Decodes pnm images.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch filesrc location=test.pnm ! pnmdec ! ffmpegcolorspace ! autovideosink
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* ]| The above pipeline reads a pnm file and renders it to the screen.
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstpnmdec.h"
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#include "gstpnmutils.h"
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#include <gst/gstutils.h>
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#include <gst/video/video.h>
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#include <string.h>
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static GstElementDetails pnmdec_details = GST_ELEMENT_DETAILS ("PNM converter",
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"Codec/Decoder/Image", "Decodes PNM format",
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"Lutz Mueller <lutz@users.sourceforge.net>");
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static GstElementClass *parent_class;
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static GstStaticPadTemplate gst_pnmdec_src_pad_template =
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GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB "; "
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"video/x-raw-gray, width =" GST_VIDEO_SIZE_RANGE ", "
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"height =" GST_VIDEO_SIZE_RANGE ", framerate =" GST_VIDEO_FPS_RANGE ", "
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"bpp= (int) 8, depth= (int) 8"));
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static GstStaticPadTemplate gst_pnmdec_sink_pad_template =
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GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
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GST_STATIC_CAPS (MIME_ALL));
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static GstFlowReturn
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gst_pnmdec_push (GstPnmdec * s, GstPad * src, GstBuffer * buf)
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{
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/* Need to convert from PNM rowstride to GStreamer rowstride */
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if (s->mngr.info.width % 4 != 0) {
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guint i_rowstride;
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guint o_rowstride;
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GstBuffer *obuf;
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guint i;
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if (s->mngr.info.type == GST_PNM_TYPE_PIXMAP) {
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i_rowstride = 3 * s->mngr.info.width;
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o_rowstride = GST_ROUND_UP_4 (i_rowstride);
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} else {
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i_rowstride = s->mngr.info.width;
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o_rowstride = GST_ROUND_UP_4 (i_rowstride);
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}
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obuf = gst_buffer_new_and_alloc (o_rowstride * s->mngr.info.height);
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gst_buffer_copy_metadata (obuf, buf, GST_BUFFER_COPY_ALL);
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for (i = 0; i < s->mngr.info.height; i++)
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memcpy (GST_BUFFER_DATA (obuf) + i * o_rowstride,
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GST_BUFFER_DATA (buf) + i * i_rowstride, i_rowstride);
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gst_buffer_unref (buf);
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return gst_pad_push (src, obuf);
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} else {
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return gst_pad_push (src, buf);
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}
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}
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static GstFlowReturn
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gst_pnmdec_chain_raw (GstPnmdec * s, GstPad * src, GstBuffer * buf)
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{
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GstFlowReturn r = GST_FLOW_OK;
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GstBuffer *out;
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/* If we got the whole image, just push the buffer. */
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if (GST_BUFFER_SIZE (buf) == s->size) {
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memset (&s->mngr, 0, sizeof (GstPnmInfoMngr));
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s->size = 0;
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gst_buffer_set_caps (buf, GST_PAD_CAPS (src));
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return gst_pnmdec_push (s, src, buf);
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}
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/* We didn't get the whole image. */
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if (!s->buf) {
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s->buf = buf;
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} else {
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out = gst_buffer_span (s->buf, 0, buf,
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GST_BUFFER_SIZE (s->buf) + GST_BUFFER_SIZE (buf));
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gst_buffer_unref (buf);
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gst_buffer_unref (s->buf);
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s->buf = out;
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}
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if (!s->buf)
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return GST_FLOW_ERROR;
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/* Do we now have the full image? If yes, push. */
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if (GST_BUFFER_SIZE (s->buf) == s->size) {
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gst_buffer_set_caps (s->buf, GST_PAD_CAPS (src));
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r = gst_pnmdec_push (s, src, s->buf);
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s->buf = NULL;
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memset (&s->mngr, 0, sizeof (GstPnmInfoMngr));
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s->size = 0;
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}
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return r;
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}
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static GstFlowReturn
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gst_pnmdec_chain_ascii (GstPnmdec * s, GstPad * src, GstBuffer * buf)
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{
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GScanner *scanner;
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GstBuffer *out;
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guint i = 0;
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gchar *b = (gchar *) GST_BUFFER_DATA (buf);
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guint bs = GST_BUFFER_SIZE (buf);
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guint target = s->size - (s->buf ? GST_BUFFER_SIZE (s->buf) : 0);
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if (!bs) {
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gst_buffer_unref (buf);
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return GST_FLOW_OK;
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}
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if (s->last_byte) {
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while (*b >= '0' && *b <= '9') {
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s->last_byte = 10 * s->last_byte + *b - '0';
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b++;
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if (!--bs) {
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gst_buffer_unref (buf);
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return GST_FLOW_OK;
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}
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}
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if (s->last_byte > 255) {
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gst_buffer_unref (buf);
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GST_DEBUG_OBJECT (s, "Corrupt ASCII encoded PNM file.");
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return GST_FLOW_ERROR;
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}
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}
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out = gst_buffer_new_and_alloc (target);
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if (s->last_byte) {
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GST_BUFFER_DATA (out)[i++] = s->last_byte;
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s->last_byte = 0;
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}
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scanner = g_scanner_new (NULL);
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g_scanner_input_text (scanner, b, bs);
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while (!g_scanner_eof (scanner)) {
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switch (g_scanner_get_next_token (scanner)) {
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case G_TOKEN_INT:
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if (i == target) {
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GST_DEBUG_OBJECT (s, "PNM file contains too much data.");
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gst_buffer_unref (buf);
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gst_buffer_unref (out);
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return GST_FLOW_ERROR;
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}
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GST_BUFFER_DATA (out)[i++] = scanner->value.v_int;
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break;
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default:
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/* Should we care? */ ;
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}
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}
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g_scanner_destroy (scanner);
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/* If we didn't get the whole image, handle the last byte with care. */
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if (i < target && b[bs - 1] > '0' && b[bs - 1] <= '9')
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s->last_byte = GST_BUFFER_DATA (out)[--i];
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gst_buffer_unref (buf);
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if (!i) {
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gst_buffer_unref (out);
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return GST_FLOW_OK;
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}
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GST_BUFFER_SIZE (out) = i;
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return gst_pnmdec_chain_raw (s, src, out);
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}
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static GstFlowReturn
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gst_pnmdec_chain (GstPad * pad, GstBuffer * data)
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{
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GstPnmdec *s = GST_PNMDEC (gst_pad_get_parent (pad));
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GstPad *src = gst_element_get_static_pad (GST_ELEMENT (s), "src");
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GstCaps *caps = NULL;
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GstFlowReturn r = GST_FLOW_OK;
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guint offset = 0;
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if (s->mngr.info.fields != GST_PNM_INFO_FIELDS_ALL) {
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switch (gst_pnm_info_mngr_scan (&s->mngr, GST_BUFFER_DATA (data),
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GST_BUFFER_SIZE (data))) {
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case GST_PNM_INFO_MNGR_RESULT_FAILED:
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gst_buffer_unref (data);
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r = GST_FLOW_ERROR;
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goto out;
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case GST_PNM_INFO_MNGR_RESULT_READING:
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gst_buffer_unref (data);
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r = GST_FLOW_OK;
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goto out;
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case GST_PNM_INFO_MNGR_RESULT_FINISHED:
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offset = s->mngr.data_offset;
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caps = gst_caps_copy (gst_pad_get_pad_template_caps (src));
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switch (s->mngr.info.type) {
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case GST_PNM_TYPE_BITMAP:
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GST_DEBUG_OBJECT (s, "FIXME: BITMAP format not implemented!");
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gst_caps_unref (caps);
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gst_buffer_unref (data);
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r = GST_FLOW_ERROR;
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goto out;
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case GST_PNM_TYPE_GRAYMAP:
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gst_caps_remove_structure (caps, 0);
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s->size = s->mngr.info.width * s->mngr.info.height * 1;
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break;
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case GST_PNM_TYPE_PIXMAP:
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gst_caps_remove_structure (caps, 1);
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s->size = s->mngr.info.width * s->mngr.info.height * 3;
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break;
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}
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gst_caps_set_simple (caps,
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"width", G_TYPE_INT, s->mngr.info.width,
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"height", G_TYPE_INT, s->mngr.info.height, "framerate",
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GST_TYPE_FRACTION, 0, 1, NULL);
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if (!gst_pad_set_caps (src, caps)) {
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gst_caps_unref (caps);
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gst_buffer_unref (data);
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r = GST_FLOW_ERROR;
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goto out;
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}
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gst_caps_unref (caps);
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}
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}
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if (offset == GST_BUFFER_SIZE (data)) {
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gst_buffer_unref (data);
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r = GST_FLOW_OK;
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goto out;
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}
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if (offset) {
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GstBuffer *buf = gst_buffer_create_sub (data, offset,
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GST_BUFFER_SIZE (data) - offset);
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gst_buffer_unref (data);
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data = buf;
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}
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if (s->mngr.info.encoding == GST_PNM_ENCODING_ASCII)
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r = gst_pnmdec_chain_ascii (s, src, data);
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else
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r = gst_pnmdec_chain_raw (s, src, data);
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out:
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gst_object_unref (src);
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gst_object_unref (s);
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return r;
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}
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static void
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gst_pnmdec_finalize (GObject * object)
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{
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GstPnmdec *dec = GST_PNMDEC (object);
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if (dec->buf) {
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gst_buffer_unref (dec->buf);
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dec->buf = NULL;
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}
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_pnmdec_init (GstPnmdec * s, GstPnmdecClass * klass)
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{
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GstPad *pad;
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pad =
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gst_pad_new_from_template (gst_static_pad_template_get
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(&gst_pnmdec_sink_pad_template), "sink");
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gst_pad_set_chain_function (pad, gst_pnmdec_chain);
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gst_element_add_pad (GST_ELEMENT (s), pad);
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pad =
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gst_pad_new_from_template (gst_static_pad_template_get
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(&gst_pnmdec_src_pad_template), "src");
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gst_element_add_pad (GST_ELEMENT (s), pad);
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}
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static void
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gst_pnmdec_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_pnmdec_sink_pad_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_pnmdec_src_pad_template));
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gst_element_class_set_details (element_class, &pnmdec_details);
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}
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static void
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gst_pnmdec_class_init (GstPnmdecClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->finalize = gst_pnmdec_finalize;
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}
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GST_BOILERPLATE (GstPnmdec, gst_pnmdec, GstElement, GST_TYPE_ELEMENT)
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