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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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rtp: Fix extension data support
Allocate header, payload and padding in separate memory blocks in gst_rtp_buffer_allocate(). don't use part of the payload data as storage for the extension data but store it in a separate memory block that can be enlarged when needed. Rework the one and two-byte header extension to make it reserve space for the extra extension first. Fix RTP unit test. Don't map the complete buffer or make assumptions on the memory layout of the underlaying implementation. We can now always add extension data because we have a separate memory block for it.
This commit is contained in:
Wim Taymans
parent
2d6fd0f72d
commit
1968127650
2 changed files with 136 additions and 128 deletions
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@ -93,7 +93,8 @@ typedef struct _GstRTPHeader
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* Allocate enough data in @buffer to hold an RTP packet with @csrc_count CSRCs,
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* a payload length of @payload_len and padding of @pad_len.
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* @buffer must be writable and all previous memory in @buffer will be freed.
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* All other RTP header fields will be set to 0/FALSE.
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* If @pad_len is >0, the padding bit will be set. All other RTP header fields
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* will be set to 0/FALSE.
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*/
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void
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gst_rtp_buffer_allocate_data (GstBuffer * buffer, guint payload_len,
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@ -101,23 +102,26 @@ gst_rtp_buffer_allocate_data (GstBuffer * buffer, guint payload_len,
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{
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GstMapInfo map;
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GstMemory *mem;
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gsize len;
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gsize hlen;
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g_return_if_fail (csrc_count <= 15);
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g_return_if_fail (GST_IS_BUFFER (buffer));
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g_return_if_fail (pad_len <= 255);
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g_return_if_fail (gst_buffer_is_writable (buffer));
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gst_buffer_remove_all_memory (buffer);
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len = GST_RTP_HEADER_LEN + csrc_count * sizeof (guint32)
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+ payload_len + pad_len;
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hlen = GST_RTP_HEADER_LEN + csrc_count * sizeof (guint32);
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mem = gst_allocator_alloc (NULL, len, NULL);
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mem = gst_allocator_alloc (NULL, hlen, NULL);
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gst_memory_map (mem, &map, GST_MAP_WRITE);
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/* fill in defaults */
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GST_RTP_HEADER_VERSION (map.data) = GST_RTP_VERSION;
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GST_RTP_HEADER_PADDING (map.data) = FALSE;
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if (pad_len)
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GST_RTP_HEADER_PADDING (map.data) = TRUE;
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else
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GST_RTP_HEADER_PADDING (map.data) = FALSE;
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GST_RTP_HEADER_EXTENSION (map.data) = FALSE;
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GST_RTP_HEADER_CSRC_COUNT (map.data) = csrc_count;
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memset (GST_RTP_HEADER_CSRC_LIST_OFFSET (map.data, 0), 0,
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@ -130,6 +134,20 @@ gst_rtp_buffer_allocate_data (GstBuffer * buffer, guint payload_len,
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gst_memory_unmap (mem, &map);
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gst_buffer_append_memory (buffer, mem);
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if (payload_len) {
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mem = gst_allocator_alloc (NULL, payload_len, NULL);
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gst_buffer_append_memory (buffer, mem);
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}
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if (pad_len) {
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mem = gst_allocator_alloc (NULL, pad_len, NULL);
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gst_memory_map (mem, &map, GST_MAP_WRITE);
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map.data[pad_len - 1] = pad_len;
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gst_memory_unmap (mem, &map);
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gst_buffer_append_memory (buffer, mem);
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}
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}
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/**
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@ -656,6 +674,43 @@ gst_rtp_buffer_get_extension_data (GstRTPBuffer * rtp, guint16 * bits,
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return TRUE;
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}
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/* ensure header, payload and padding are in separate buffers */
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static void
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ensure_buffers (GstRTPBuffer * rtp)
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{
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guint i, pos;
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gsize offset;
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gboolean changed = FALSE;
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/* make sure payload is mapped */
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gst_rtp_buffer_get_payload (rtp);
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for (i = 0, pos = 0; i < 4; i++) {
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if (rtp->size[i]) {
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offset = rtp->map[i].data - (guint8 *) rtp->data[i];
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if (offset != 0 || rtp->map[i].size != rtp->size[i]) {
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GstMemory *mem;
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/* make copy */
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mem = gst_memory_copy (rtp->map[i].memory, offset, rtp->size[i]);
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/* insert new memory */
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gst_buffer_insert_memory (rtp->buffer, pos, mem);
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changed = TRUE;
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}
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pos++;
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}
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}
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if (changed) {
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gst_rtp_buffer_unmap (rtp);
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gst_buffer_remove_memory_range (rtp->buffer, pos, -1);
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gst_rtp_buffer_map (rtp->buffer, GST_MAP_READWRITE, rtp);
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}
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}
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/**
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* gst_rtp_buffer_set_extension_data:
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* @rtp: the RTP packet
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@ -664,8 +719,8 @@ gst_rtp_buffer_get_extension_data (GstRTPBuffer * rtp, guint16 * bits,
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* the extension, excluding the extension header ( therefore zero is a valid length)
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*
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* Set the extension bit of the rtp buffer and fill in the @bits and @length of the
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* extension header. It will refuse to set the extension data if the buffer is not
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* large enough.
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* extension header. If the existing extension data is not large enough, it will
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* be made larger.
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*
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* Returns: True if done.
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*/
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@ -675,16 +730,43 @@ gst_rtp_buffer_set_extension_data (GstRTPBuffer * rtp, guint16 bits,
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{
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guint32 min_size = 0;
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guint8 *data;
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GstMemory *mem = NULL;
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/* FIXME, we should allocate and map the extension data */
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data = rtp->data[0];
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ensure_buffers (rtp);
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/* check if the buffer is big enough to hold the extension */
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/* this is the size of the extension data we need */
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min_size = 4 + length * sizeof (guint32);
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if (G_UNLIKELY (min_size > rtp->size[1]))
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goto too_small;
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/* we should allocate and map the extension data */
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if (rtp->data[1] == NULL || min_size > rtp->size[1]) {
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GstMapInfo map;
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/* we don't have (enough) extension data, make some */
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mem = gst_allocator_alloc (NULL, min_size, NULL);
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if (rtp->data[1]) {
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/* copy old data */
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gst_memory_map (mem, &map, GST_MAP_WRITE);
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memcpy (map.data, rtp->data[1], rtp->size[1]);
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gst_memory_unmap (mem, &map);
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/* unmap old */
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gst_buffer_unmap (rtp->buffer, &rtp->map[1]);
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gst_buffer_replace_memory (rtp->buffer, 1, mem);
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} else {
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/* we didn't have extension data, add */
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gst_buffer_insert_memory (rtp->buffer, 1, mem);
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}
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/* map new */
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gst_memory_map (mem, &rtp->map[1], GST_MAP_READWRITE);
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gst_memory_ref (mem);
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rtp->data[1] = rtp->map[1].data;
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rtp->size[1] = rtp->map[1].size;
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}
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/* now we can set the extension bit */
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data = rtp->data[0];
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GST_RTP_HEADER_EXTENSION (data) = TRUE;
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data = rtp->data[1];
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@ -692,15 +774,6 @@ gst_rtp_buffer_set_extension_data (GstRTPBuffer * rtp, guint16 bits,
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GST_WRITE_UINT16_BE (data + 2, length);
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return TRUE;
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/* ERRORS */
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too_small:
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{
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g_warning
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("rtp buffer too small: need more than %d bytes but only have %"
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G_GSIZE_FORMAT " bytes", min_size, rtp->size[1]);
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return FALSE;
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}
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}
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/**
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@ -1311,6 +1384,7 @@ gst_rtp_buffer_add_extension_onebyte_header (GstRTPBuffer * rtp, guint8 id,
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guint8 *pdata = 0;
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guint wordlen;
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gboolean has_bit;
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guint extlen, offset = 0;
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g_return_val_if_fail (id > 0 && id < 15, FALSE);
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g_return_val_if_fail (size >= 1 && size <= 16, FALSE);
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@ -1320,51 +1394,30 @@ gst_rtp_buffer_add_extension_onebyte_header (GstRTPBuffer * rtp, guint8 id,
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(gpointer) & pdata, &wordlen);
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if (has_bit) {
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gulong offset = 0;
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guint8 *nextext;
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guint extlen;
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if (bits != 0xBEDE)
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return FALSE;
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offset = get_onebyte_header_end_offset (pdata, wordlen);
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if (offset == 0)
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return FALSE;
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nextext = pdata + offset;
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offset = nextext - rtp->map[0].data;
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/* Don't add extra header if there isn't enough space */
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if (rtp->map[0].size < offset + size + 1)
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return FALSE;
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nextext[0] = (id << 4) | (0x0F & (size - 1));
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memcpy (nextext + 1, data, size);
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extlen = nextext - pdata + size + 1;
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if (extlen % 4) {
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wordlen = extlen / 4 + 1;
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memset (nextext + size + 1, 0, 4 - extlen % 4);
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} else {
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wordlen = extlen / 4;
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}
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gst_rtp_buffer_set_extension_data (rtp, 0xBEDE, wordlen);
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} else {
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wordlen = (size + 1) / 4 + (((size + 1) % 4) ? 1 : 0);
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gst_rtp_buffer_set_extension_data (rtp, 0xBEDE, wordlen);
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gst_rtp_buffer_get_extension_data (rtp, &bits,
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(gpointer) & pdata, &wordlen);
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pdata[0] = (id << 4) | (0x0F & (size - 1));
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memcpy (pdata + 1, data, size);
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if ((size + 1) % 4)
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memset (pdata + size + 1, 0, 4 - ((size + 1) % 4));
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}
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/* the required size of the new extension data */
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extlen = offset + size + 1;
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/* calculate amount of words */
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wordlen = extlen / 4 + ((extlen % 4) ? 1 : 0);
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gst_rtp_buffer_set_extension_data (rtp, 0xBEDE, wordlen);
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gst_rtp_buffer_get_extension_data (rtp, &bits, (gpointer) & pdata, &wordlen);
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pdata += offset;
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pdata[0] = (id << 4) | (0x0F & (size - 1));
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memcpy (pdata + 1, data, size);
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if (extlen % 4)
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memset (pdata + 1 + size, 0, 4 - (extlen % 4));
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return TRUE;
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}
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@ -1430,6 +1483,8 @@ gst_rtp_buffer_add_extension_twobytes_header (GstRTPBuffer * rtp,
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guint8 *pdata = 0;
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guint wordlen;
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gboolean has_bit;
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gulong offset = 0;
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guint extlen;
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g_return_val_if_fail ((appbits & 0xF0) == 0, FALSE);
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g_return_val_if_fail (size < 256, FALSE);
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@ -1439,52 +1494,30 @@ gst_rtp_buffer_add_extension_twobytes_header (GstRTPBuffer * rtp,
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(gpointer) & pdata, &wordlen);
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if (has_bit) {
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gulong offset = 0;
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guint8 *nextext;
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guint extlen;
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if (bits != ((0x100 << 4) | (appbits & 0x0f)))
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return FALSE;
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offset = get_twobytes_header_end_offset (pdata, wordlen);
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nextext = pdata + offset;
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offset = nextext - rtp->map[0].data;
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/* Don't add extra header if there isn't enough space */
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if (rtp->map[0].size < offset + size + 2)
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if (offset == 0)
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return FALSE;
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nextext[0] = id;
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nextext[1] = size;
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memcpy (nextext + 2, data, size);
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extlen = nextext - pdata + size + 2;
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if (extlen % 4) {
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wordlen = extlen / 4 + 1;
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memset (nextext + size + 2, 0, 4 - extlen % 4);
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} else {
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wordlen = extlen / 4;
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}
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gst_rtp_buffer_set_extension_data (rtp, (0x100 << 4) | (appbits & 0x0F),
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wordlen);
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} else {
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wordlen = (size + 2) / 4 + (((size + 2) % 4) ? 1 : 0);
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gst_rtp_buffer_set_extension_data (rtp, (0x100 << 4) | (appbits & 0x0F),
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wordlen);
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gst_rtp_buffer_get_extension_data (rtp, &bits,
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(gpointer) & pdata, &wordlen);
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pdata[0] = id;
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pdata[1] = size;
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memcpy (pdata + 2, data, size);
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if ((size + 2) % 4)
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memset (pdata + size + 2, 0, 4 - ((size + 2) % 4));
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}
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/* the required size of the new extension data */
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extlen = offset + size + 2;
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/* calculate amount of words */
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wordlen = extlen / 4 + ((extlen % 4) ? 1 : 0);
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gst_rtp_buffer_set_extension_data (rtp, (0x100 << 4) | (appbits & 0x0F),
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wordlen);
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gst_rtp_buffer_get_extension_data (rtp, &bits, (gpointer) & pdata, &wordlen);
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pdata += offset;
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pdata[0] = id;
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pdata[1] = size;
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memcpy (pdata + 2, data, size);
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if (extlen % 4)
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memset (pdata + 2 + size, 0, 4 - (extlen % 4));
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return TRUE;
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}
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@ -50,12 +50,12 @@ GST_START_TEST (test_rtp_buffer)
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/* check defaults */
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fail_unless_equals_int (gst_rtp_buffer_get_version (&rtp), 2);
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fail_unless (gst_rtp_buffer_get_padding (&rtp) == FALSE);
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fail_unless (gst_rtp_buffer_get_padding (&rtp) == TRUE);
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fail_unless (gst_rtp_buffer_get_extension (&rtp) == FALSE);
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fail_unless_equals_int (gst_rtp_buffer_get_csrc_count (&rtp), 0);
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fail_unless (gst_rtp_buffer_get_marker (&rtp) == FALSE);
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fail_unless (gst_rtp_buffer_get_payload_type (&rtp) == 0);
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fail_unless_equals_int (GST_READ_UINT16_BE (data), 0x8000);
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fail_unless_equals_int (GST_READ_UINT16_BE (data), 0xa000);
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/* check version in bitfield */
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gst_rtp_buffer_set_version (&rtp, 3);
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@ -224,7 +224,6 @@ GST_END_TEST;
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GST_START_TEST (test_rtp_buffer_set_extension_data)
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{
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GstBuffer *buf;
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GstMapInfo map;
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guint8 *data;
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guint16 bits;
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guint size;
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@ -235,33 +234,19 @@ GST_START_TEST (test_rtp_buffer_set_extension_data)
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/* check GstRTPHeader structure alignment and packing */
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buf = gst_rtp_buffer_new_allocate (4, 0, 0);
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gst_buffer_map (buf, &map, GST_MAP_READWRITE);
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data = map.data;
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gst_rtp_buffer_map (buf, GST_MAP_READWRITE, &rtp);
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/* should be impossible to set the extension data */
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ASSERT_WARNING (fail_unless (gst_rtp_buffer_set_extension_data (&rtp, 0,
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4) == FALSE));
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fail_unless (gst_rtp_buffer_get_extension (&rtp) == FALSE);
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/* should be possible to set the extension data */
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fail_unless (gst_rtp_buffer_set_extension_data (&rtp, 270, 0) == TRUE);
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fail_unless (gst_rtp_buffer_set_extension_data (&rtp, 270, 4) == TRUE);
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fail_unless (gst_rtp_buffer_get_extension (&rtp) == TRUE);
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gst_rtp_buffer_get_extension_data (&rtp, &bits, &pointer, &size);
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fail_unless (bits == 270);
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fail_unless (size == 0);
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fail_unless (pointer == data + 16);
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pointer = gst_rtp_buffer_get_payload (&rtp);
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fail_unless (pointer == data + 16);
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gst_buffer_unmap (buf, &map);
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fail_unless (size == 4);
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gst_rtp_buffer_unmap (&rtp);
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gst_buffer_unref (buf);
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buf = gst_rtp_buffer_new_allocate (20, 0, 0);
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gst_buffer_map (buf, &map, GST_MAP_READWRITE);
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data = map.data;
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gst_rtp_buffer_map (buf, GST_MAP_READWRITE, &rtp);
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fail_unless (gst_rtp_buffer_get_extension (&rtp) == FALSE);
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@ -270,18 +255,12 @@ GST_START_TEST (test_rtp_buffer_set_extension_data)
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gst_rtp_buffer_get_extension_data (&rtp, &bits, &pointer, &size);
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fail_unless (bits == 333);
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fail_unless (size == 2);
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fail_unless (pointer == data + 16);
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pointer = gst_rtp_buffer_get_payload (&rtp);
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fail_unless (pointer == data + 24);
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gst_buffer_unmap (buf, &map);
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gst_rtp_buffer_unmap (&rtp);
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gst_buffer_unref (buf);
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/* Test header extensions with a one byte header */
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buf = gst_rtp_buffer_new_allocate (20, 0, 0);
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gst_buffer_map (buf, &map, GST_MAP_READWRITE);
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data = map.data;
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gst_rtp_buffer_map (buf, GST_MAP_READWRITE, &rtp);
|
||||
|
||||
fail_unless (gst_rtp_buffer_get_extension (&rtp) == FALSE);
|
||||
|
|
@ -339,14 +318,11 @@ GST_START_TEST (test_rtp_buffer_set_extension_data)
|
|||
fail_unless (size == 2);
|
||||
fail_unless (memcmp (pointer, misc_data, 2) == 0);
|
||||
|
||||
gst_buffer_unmap (buf, &map);
|
||||
gst_rtp_buffer_unmap (&rtp);
|
||||
gst_buffer_unref (buf);
|
||||
|
||||
/* Test header extensions with a two bytes header */
|
||||
buf = gst_rtp_buffer_new_allocate (20, 0, 0);
|
||||
gst_buffer_map (buf, &map, GST_MAP_READWRITE);
|
||||
data = map.data;
|
||||
gst_rtp_buffer_map (buf, GST_MAP_READWRITE, &rtp);
|
||||
|
||||
fail_unless (gst_rtp_buffer_get_extension (&rtp) == FALSE);
|
||||
|
|
@ -405,7 +381,6 @@ GST_START_TEST (test_rtp_buffer_set_extension_data)
|
|||
fail_unless (size == 2);
|
||||
fail_unless (memcmp (pointer, misc_data, 2) == 0);
|
||||
|
||||
gst_buffer_unmap (buf, &map);
|
||||
gst_rtp_buffer_unmap (&rtp);
|
||||
gst_buffer_unref (buf);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue