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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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mpegts: Add support for creating PAT/PMT
This commit is contained in:
Jesper Larsen
parent
fccfc76805
commit
ffb51c2123
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@ -482,6 +482,109 @@ gst_mpegts_section_get_pat (GstMpegTsSection * section)
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return NULL;
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}
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/**
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* gst_mpegts_pat_new:
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*
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* Allocates a new #GPtrArray for #GstMpegTsPatProgram
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*
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* Returns: (transfer full) (element-type GstMpegTsPatProgram): A newly allocated #GPtrArray
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*/
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GPtrArray *
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gst_mpegts_pat_new (void)
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{
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GPtrArray *pat;
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pat = g_ptr_array_new_with_free_func (
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(GDestroyNotify) _mpegts_pat_program_free);
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return pat;
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}
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/**
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* gst_mpegts_pat_program_new:
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*
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* Allocates a new #GstMpegTsPatProgram.
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*
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* Returns: (transfer full): A newly allocated #GstMpegTsPatProgram
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*/
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GstMpegTsPatProgram *
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gst_mpegts_pat_program_new (void)
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{
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GstMpegTsPatProgram *program;
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program = g_slice_new0 (GstMpegTsPatProgram);
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return program;
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}
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static gboolean
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_packetize_pat (GstMpegTsSection * section)
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{
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GPtrArray *programs;
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guint8 *data;
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gsize length;
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guint i;
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programs = gst_mpegts_section_get_pat (section);
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if (programs == NULL)
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return FALSE;
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/* 8 byte common section fields
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4 byte CRC */
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length = 12;
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/* 2 byte program number
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2 byte program/network PID */
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length += programs->len * 4;
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_packetize_common_section (section, length);
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data = section->data + 8;
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for (i = 0; i < programs->len; i++) {
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GstMpegTsPatProgram *program;
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program = g_ptr_array_index (programs, i);
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/* program_number - 16 bit uimsbf */
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GST_WRITE_UINT16_BE (data, program->program_number);
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data += 2;
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/* reserved - 3 bit
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program/network_PID - 13 uimsbf */
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GST_WRITE_UINT16_BE (data, program->network_or_program_map_PID | 0xE000);
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data += 2;
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}
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g_ptr_array_unref (programs);
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return TRUE;
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}
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/**
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* gst_mpegts_section_from_pat:
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* @programs: (transfer full) (element-type GstMpegTsPatProgram): an array of #GstMpegTsPatProgram
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* @ts_id: Transport stream ID of the PAT
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*
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* Creates a PAT #GstMpegTsSection from the @programs array of #GstMpegTsPatPrograms
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*
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* Returns: (transfer full): a #GstMpegTsSection
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*/
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GstMpegTsSection *
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gst_mpegts_section_from_pat (GPtrArray * programs, guint16 ts_id)
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{
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GstMpegTsSection *section;
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section = _gst_mpegts_section_init (0x00,
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GST_MTS_TABLE_ID_PROGRAM_ASSOCIATION);
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section->subtable_extension = ts_id;
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section->cached_parsed = (gpointer) programs;
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section->packetizer = _packetize_pat;
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section->destroy_parsed = (GDestroyNotify) g_ptr_array_unref;
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return section;
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}
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/* Program Map Table */
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@ -639,6 +742,167 @@ gst_mpegts_section_get_pmt (GstMpegTsSection * section)
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return (const GstMpegTsPMT *) section->cached_parsed;
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}
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/**
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* gst_mpegts_pmt_new:
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*
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* Allocates and initializes a new #GstMpegTsPMT.
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*
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* Returns: (transfer full): #GstMpegTsPMT
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*/
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GstMpegTsPMT *
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gst_mpegts_pmt_new (void)
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{
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GstMpegTsPMT *pmt;
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pmt = g_slice_new0 (GstMpegTsPMT);
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pmt->descriptors =
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g_ptr_array_new_with_free_func ((GDestroyNotify) _free_descriptor);
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pmt->streams = g_ptr_array_new_with_free_func ((GDestroyNotify)
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_gst_mpegts_pmt_stream_free);
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return pmt;
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}
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/**
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* gst_mpegts_pmt_stream_new:
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*
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* Allocates and initializes a new #GstMpegTsPMTStream.
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*
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* Returns: (transfer full): #GstMpegTsPMTStream
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*/
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GstMpegTsPMTStream *
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gst_mpegts_pmt_stream_new (void)
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{
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GstMpegTsPMTStream *stream;
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stream = g_slice_new0 (GstMpegTsPMTStream);
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stream->descriptors =
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g_ptr_array_new_with_free_func ((GDestroyNotify) _free_descriptor);
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return stream;
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}
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static gboolean
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_packetize_pmt (GstMpegTsSection * section)
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{
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const GstMpegTsPMT *pmt;
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GstMpegTsPMTStream *stream;
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GstMpegTsDescriptor *descriptor;
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gsize length, pgm_info_length, stream_length;
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guint8 *data;
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guint i, j;
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pmt = gst_mpegts_section_get_pmt (section);
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if (pmt == NULL)
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return FALSE;
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/* 8 byte common section fields
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2 byte PCR pid
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2 byte program info length
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4 byte CRC */
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length = 16;
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/* Find length of program info */
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pgm_info_length = 0;
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if (pmt->descriptors) {
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for (i = 0; i < pmt->descriptors->len; i++) {
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descriptor = g_ptr_array_index (pmt->descriptors, i);
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pgm_info_length += descriptor->length + 2;
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}
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}
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/* Find length of PMT streams */
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stream_length = 0;
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if (pmt->streams) {
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for (i = 0; i < pmt->streams->len; i++) {
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stream = g_ptr_array_index (pmt->streams, i);
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/* 1 byte stream type
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2 byte PID
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2 byte ES info length */
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stream_length += 5;
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if (stream->descriptors) {
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for (j = 0; j < stream->descriptors->len; j++) {
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descriptor = g_ptr_array_index (stream->descriptors, i);
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stream_length += descriptor->length + 2;
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}
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}
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}
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}
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length += pgm_info_length + stream_length;
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_packetize_common_section (section, length);
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data = section->data + 8;
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/* reserved - 3 bit
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PCR_PID - 13 uimsbf */
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GST_WRITE_UINT16_BE (data, pmt->pcr_pid | 0xE000);
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data += 2;
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/* reserved - 4 bit
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program_info_length - 12 uimsbf */
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GST_WRITE_UINT16_BE (data, pgm_info_length | 0xF000);
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data += 2;
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_packetize_descriptor_array (pmt->descriptors, &data);
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if (pmt->streams) {
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guint8 *pos;
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for (i = 0; i < pmt->streams->len; i++) {
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stream = g_ptr_array_index (pmt->streams, i);
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/* stream_type - 8 bit uimsbf */
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*data++ = stream->stream_type;
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/* reserved - 3 bit
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elementary_PID - 13 bit uimsbf */
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GST_WRITE_UINT16_BE (data, stream->pid | 0xE000);
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data += 2;
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/* reserved - 4 bit
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ES_info_length - 12 bit uimsbf */
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pos = data;
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data += 2;
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_packetize_descriptor_array (stream->descriptors, &data);
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/* Go back and update descriptor length */
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GST_WRITE_UINT16_BE (pos, (data - pos - 2) | 0xF000);
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}
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}
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return TRUE;
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}
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/**
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* gst_mpegts_section_from_pmt:
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* @pmt: (transfer full): a #GstMpegTsPMT to create a #GstMpegTsSection from
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* @pid: The PID that the #GstMpegTsPMT belongs to
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*
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* Creates a #GstMpegTsSection from @pmt that is bound to @pid
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*
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* Returns: (transfer full): #GstMpegTsSection
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*/
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GstMpegTsSection *
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gst_mpegts_section_from_pmt (GstMpegTsPMT * pmt, guint16 pid)
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{
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GstMpegTsSection *section;
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g_return_val_if_fail (pmt != NULL, NULL);
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section = _gst_mpegts_section_init (pid, GST_MTS_TABLE_ID_TS_PROGRAM_MAP);
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section->subtable_extension = pmt->program_number;
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section->cached_parsed = (gpointer) pmt;
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section->packetizer = _packetize_pmt;
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section->destroy_parsed = (GDestroyNotify) _gst_mpegts_pmt_free;
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return section;
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}
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/* Conditional Access Table */
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static gpointer
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@ -182,6 +182,11 @@ struct _GstMpegTsPatProgram
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GPtrArray *gst_mpegts_section_get_pat (GstMpegTsSection *section);
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GType gst_mpegts_pat_program_get_type (void);
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GPtrArray *gst_mpegts_pat_new (void);
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GstMpegTsPatProgram *gst_mpegts_pat_program_new (void);
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GstMpegTsSection *gst_mpegts_section_from_pat (GPtrArray * programs,
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guint16 ts_id);
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/* CAT */
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GPtrArray *gst_mpegts_section_get_cat (GstMpegTsSection *section);
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@ -348,7 +353,10 @@ struct _GstMpegTsPMT
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GType gst_mpegts_pmt_get_type (void);
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GType gst_mpegts_pmt_stream_get_type (void);
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GstMpegTsPMT *gst_mpegts_pmt_new (void);
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GstMpegTsPMTStream *gst_mpegts_pmt_stream_new (void);
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const GstMpegTsPMT *gst_mpegts_section_get_pmt (GstMpegTsSection *section);
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GstMpegTsSection *gst_mpegts_section_from_pmt (GstMpegTsPMT *pmt, guint16 pid);
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/* TSDT */
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