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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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read() fallback when mmap() fails (#117786)
Original commit message from CVS: read() fallback when mmap() fails (#117786)
This commit is contained in:
Ronald S. Bultje
parent
a3705d33ef
commit
828cd46f49
4 changed files with 164 additions and 74 deletions
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@ -396,7 +396,7 @@ gst_filesrc_map_region (GstFileSrc *src, off_t offset, size_t size)
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return NULL;
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}
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else if (mmapregion == MAP_FAILED) {
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gst_element_error (GST_ELEMENT (src), "mmap (0x%x, %d, 0x%llx) : %s",
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GST_DEBUG (0, "mmap (0x%x, %d, 0x%llx) : %s",
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size, src->fd, offset, strerror (errno));
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return NULL;
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}
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@ -479,50 +479,20 @@ gst_filesrc_search_region_match (gpointer a, gpointer b)
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}
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/**
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* gst_filesrc_get:
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* gst_filesrc_get_mmap:
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* @pad: #GstPad to push a buffer from
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*
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* Push a new buffer from the filesrc at the current offset.
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*/
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static GstBuffer *
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gst_filesrc_get (GstPad *pad)
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gst_filesrc_get_mmap (GstFileSrc *src)
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{
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GstFileSrc *src;
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GstBuffer *buf = NULL, *map;
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size_t readsize;
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off_t readend,mapstart,mapend;
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GstFileSrcRegion region;
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int i;
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g_return_val_if_fail (pad != NULL, NULL);
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src = GST_FILESRC (gst_pad_get_parent (pad));
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g_return_val_if_fail (GST_FLAG_IS_SET (src, GST_FILESRC_OPEN), NULL);
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/* check for seek */
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if (src->seek_happened) {
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GstEvent *event;
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src->seek_happened = FALSE;
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GST_DEBUG (GST_CAT_EVENT, "filesrc sending discont");
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event = gst_event_new_discontinuous (FALSE, GST_FORMAT_BYTES, src->curoffset, NULL);
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src->need_flush = FALSE;
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return GST_BUFFER (event);
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}
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/* check for flush */
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if (src->need_flush) {
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src->need_flush = FALSE;
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GST_DEBUG (GST_CAT_EVENT, "filesrc sending flush");
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return GST_BUFFER (gst_event_new_flush ());
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}
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/* check for EOF */
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if (src->curoffset == src->filelen) {
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GST_DEBUG (0, "filesrc eos %" G_GINT64_FORMAT
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" %" G_GINT64_FORMAT, src->curoffset, src->filelen);
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gst_element_set_eos (GST_ELEMENT (src));
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return GST_BUFFER (gst_event_new (GST_EVENT_EOS));
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}
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/* calculate end pointers so we don't have to do so repeatedly later */
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readsize = src->block_size;
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readend = src->curoffset + src->block_size; /* note this is the byte *after* the read */
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@ -638,6 +608,78 @@ gst_filesrc_get (GstPad *pad)
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return buf;
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}
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static GstBuffer *
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gst_filesrc_get_read (GstFileSrc *src)
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{
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GstBuffer *buf = NULL;
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size_t readsize;
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int ret;
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readsize = src->block_size;
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if (src->curoffset + readsize > src->filelen) {
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readsize = src->filelen - src->curoffset;
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}
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buf = gst_buffer_new_and_alloc (readsize);
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g_return_val_if_fail (buf != NULL, NULL);
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ret = read (src->fd, GST_BUFFER_DATA (buf), readsize);
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if (ret < 0){
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gst_element_error (GST_ELEMENT (src), "reading file (%s)",
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strerror (errno), NULL);
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return NULL;
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}
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if (ret < readsize) {
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gst_element_error (GST_ELEMENT (src), "unexpected end of file", NULL);
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return NULL;
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}
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src->curoffset += readsize;
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return buf;
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}
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static GstBuffer *
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gst_filesrc_get (GstPad *pad)
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{
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GstFileSrc *src;
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g_return_val_if_fail (pad != NULL, NULL);
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src = GST_FILESRC (gst_pad_get_parent (pad));
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g_return_val_if_fail (GST_FLAG_IS_SET (src, GST_FILESRC_OPEN), NULL);
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/* check for seek */
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if (src->seek_happened) {
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GstEvent *event;
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src->seek_happened = FALSE;
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GST_DEBUG (GST_CAT_EVENT, "filesrc sending discont");
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event = gst_event_new_discontinuous (FALSE, GST_FORMAT_BYTES, src->curoffset, NULL);
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src->need_flush = FALSE;
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return GST_BUFFER (event);
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}
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/* check for flush */
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if (src->need_flush) {
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src->need_flush = FALSE;
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GST_DEBUG (GST_CAT_EVENT, "filesrc sending flush");
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return GST_BUFFER (gst_event_new_flush ());
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}
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/* check for EOF */
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if (src->curoffset == src->filelen) {
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GST_DEBUG (0, "filesrc eos %" G_GINT64_FORMAT
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" %" G_GINT64_FORMAT, src->curoffset, src->filelen);
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gst_element_set_eos (GST_ELEMENT (src));
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return GST_BUFFER (gst_event_new (GST_EVENT_EOS));
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}
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if (src->using_mmap){
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return gst_filesrc_get_mmap (src);
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}else{
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return gst_filesrc_get_read (src);
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}
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}
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/* open the file and mmap it, necessary to go to READY state */
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static gboolean
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gst_filesrc_open_file (GstFileSrc *src)
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@ -666,13 +708,15 @@ gst_filesrc_open_file (GstFileSrc *src)
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}
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/* find the file length */
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src->filelen = lseek (src->fd, 0, SEEK_END);
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lseek (src->fd, 0, SEEK_SET);
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src->filelen = stat_results.st_size;
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/* allocate the first mmap'd region */
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src->mapbuf = gst_filesrc_map_region (src, 0, src->mapsize);
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if (src->mapbuf == NULL)
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return FALSE;
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if (src->mapbuf == NULL) {
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src->using_mmap = FALSE;
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}else{
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src->using_mmap = TRUE;
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}
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src->curoffset = 0;
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@ -63,6 +63,7 @@ struct _GstFileSrc {
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off_t curoffset; /* current offset in file*/
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off_t block_size; /* bytes per read */
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gboolean touch; /* whether to touch every page */
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gboolean using_mmap; /* if we're using mmap to read the file */
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GstBuffer *mapbuf;
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size_t mapsize;
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@ -396,7 +396,7 @@ gst_filesrc_map_region (GstFileSrc *src, off_t offset, size_t size)
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return NULL;
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}
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else if (mmapregion == MAP_FAILED) {
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gst_element_error (GST_ELEMENT (src), "mmap (0x%x, %d, 0x%llx) : %s",
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GST_DEBUG (0, "mmap (0x%x, %d, 0x%llx) : %s",
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size, src->fd, offset, strerror (errno));
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return NULL;
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}
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@ -479,50 +479,20 @@ gst_filesrc_search_region_match (gpointer a, gpointer b)
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}
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/**
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* gst_filesrc_get:
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* gst_filesrc_get_mmap:
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* @pad: #GstPad to push a buffer from
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*
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* Push a new buffer from the filesrc at the current offset.
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*/
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static GstBuffer *
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gst_filesrc_get (GstPad *pad)
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gst_filesrc_get_mmap (GstFileSrc *src)
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{
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GstFileSrc *src;
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GstBuffer *buf = NULL, *map;
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size_t readsize;
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off_t readend,mapstart,mapend;
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GstFileSrcRegion region;
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int i;
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g_return_val_if_fail (pad != NULL, NULL);
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src = GST_FILESRC (gst_pad_get_parent (pad));
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g_return_val_if_fail (GST_FLAG_IS_SET (src, GST_FILESRC_OPEN), NULL);
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/* check for seek */
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if (src->seek_happened) {
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GstEvent *event;
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src->seek_happened = FALSE;
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GST_DEBUG (GST_CAT_EVENT, "filesrc sending discont");
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event = gst_event_new_discontinuous (FALSE, GST_FORMAT_BYTES, src->curoffset, NULL);
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src->need_flush = FALSE;
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return GST_BUFFER (event);
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}
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/* check for flush */
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if (src->need_flush) {
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src->need_flush = FALSE;
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GST_DEBUG (GST_CAT_EVENT, "filesrc sending flush");
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return GST_BUFFER (gst_event_new_flush ());
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}
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/* check for EOF */
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if (src->curoffset == src->filelen) {
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GST_DEBUG (0, "filesrc eos %" G_GINT64_FORMAT
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" %" G_GINT64_FORMAT, src->curoffset, src->filelen);
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gst_element_set_eos (GST_ELEMENT (src));
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return GST_BUFFER (gst_event_new (GST_EVENT_EOS));
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}
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/* calculate end pointers so we don't have to do so repeatedly later */
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readsize = src->block_size;
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readend = src->curoffset + src->block_size; /* note this is the byte *after* the read */
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@ -638,6 +608,78 @@ gst_filesrc_get (GstPad *pad)
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return buf;
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}
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static GstBuffer *
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gst_filesrc_get_read (GstFileSrc *src)
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{
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GstBuffer *buf = NULL;
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size_t readsize;
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int ret;
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readsize = src->block_size;
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if (src->curoffset + readsize > src->filelen) {
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readsize = src->filelen - src->curoffset;
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}
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buf = gst_buffer_new_and_alloc (readsize);
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g_return_val_if_fail (buf != NULL, NULL);
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ret = read (src->fd, GST_BUFFER_DATA (buf), readsize);
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if (ret < 0){
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gst_element_error (GST_ELEMENT (src), "reading file (%s)",
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strerror (errno), NULL);
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return NULL;
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}
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if (ret < readsize) {
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gst_element_error (GST_ELEMENT (src), "unexpected end of file", NULL);
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return NULL;
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}
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src->curoffset += readsize;
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return buf;
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}
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static GstBuffer *
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gst_filesrc_get (GstPad *pad)
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{
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GstFileSrc *src;
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g_return_val_if_fail (pad != NULL, NULL);
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src = GST_FILESRC (gst_pad_get_parent (pad));
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g_return_val_if_fail (GST_FLAG_IS_SET (src, GST_FILESRC_OPEN), NULL);
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/* check for seek */
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if (src->seek_happened) {
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GstEvent *event;
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src->seek_happened = FALSE;
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GST_DEBUG (GST_CAT_EVENT, "filesrc sending discont");
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event = gst_event_new_discontinuous (FALSE, GST_FORMAT_BYTES, src->curoffset, NULL);
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src->need_flush = FALSE;
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return GST_BUFFER (event);
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}
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/* check for flush */
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if (src->need_flush) {
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src->need_flush = FALSE;
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GST_DEBUG (GST_CAT_EVENT, "filesrc sending flush");
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return GST_BUFFER (gst_event_new_flush ());
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}
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/* check for EOF */
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if (src->curoffset == src->filelen) {
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GST_DEBUG (0, "filesrc eos %" G_GINT64_FORMAT
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" %" G_GINT64_FORMAT, src->curoffset, src->filelen);
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gst_element_set_eos (GST_ELEMENT (src));
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return GST_BUFFER (gst_event_new (GST_EVENT_EOS));
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}
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if (src->using_mmap){
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return gst_filesrc_get_mmap (src);
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}else{
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return gst_filesrc_get_read (src);
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}
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}
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/* open the file and mmap it, necessary to go to READY state */
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static gboolean
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gst_filesrc_open_file (GstFileSrc *src)
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@ -666,13 +708,15 @@ gst_filesrc_open_file (GstFileSrc *src)
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}
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/* find the file length */
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src->filelen = lseek (src->fd, 0, SEEK_END);
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lseek (src->fd, 0, SEEK_SET);
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src->filelen = stat_results.st_size;
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/* allocate the first mmap'd region */
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src->mapbuf = gst_filesrc_map_region (src, 0, src->mapsize);
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if (src->mapbuf == NULL)
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return FALSE;
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if (src->mapbuf == NULL) {
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src->using_mmap = FALSE;
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}else{
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src->using_mmap = TRUE;
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}
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src->curoffset = 0;
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@ -63,6 +63,7 @@ struct _GstFileSrc {
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off_t curoffset; /* current offset in file*/
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off_t block_size; /* bytes per read */
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gboolean touch; /* whether to touch every page */
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gboolean using_mmap; /* if we're using mmap to read the file */
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GstBuffer *mapbuf;
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size_t mapsize;
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