/*****************************************************************************
* Preamble
*****************************************************************************/
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <errno.h>
-#include <fcntl.h>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
-#include <vlc/vlc.h>
+#include <vlc_common.h>
#include <vlc_sout.h>
#include <vlc_block.h>
-
-#ifdef HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include <assert.h>
#include <vlc_codecs.h>
#include "pes.h"
#include "bits.h"
+/** PESHeader, write a pes header
+ * \param i_es_size length of payload data. (Must be < PES_PAYLOAD_SIZE_MAX
+ * unless the conditions for unbounded PES packets are met)
+ * \param i_stream_id stream id as follows:
+ * - 0x00 - 0xff : normal stream_id as per Table 2-18
+ * - 0xfd00 - 0xfd7f : stream_id_extension = low 7 bits
+ * (stream_id = PES_EXTENDED_STREAM_ID)
+ * - 0xbd00 - 0xbdff : private_id = low 8 bits
+ * (stream_id = PES_PRIVATE_STREAM)
+ * \param i_header_size length of padding data to insert into PES packet
+ * header in bytes.
+ */
static inline int PESHeader( uint8_t *p_hdr, mtime_t i_pts, mtime_t i_dts,
int i_es_size, es_format_t *p_fmt,
- int i_stream_id, int i_private_id,
- vlc_bool_t b_mpeg2, vlc_bool_t b_data_alignment,
- int i_header_size )
+ int i_stream_id, bool b_mpeg2,
+ bool b_data_alignment, int i_header_size )
{
bits_buffer_t bits;
int i_extra = 0;
+ int i_private_id = -1;
+ int i_stream_id_extension = 0;
- /* For PES_PRIVATE_STREAM_1 there is an extra header after the
- pes header */
- /* i_private_id != -1 because TS use 0xbd without private_id */
- if( i_stream_id == PES_PRIVATE_STREAM_1 && i_private_id != -1 )
+ /* HACK for private stream 1 in ps */
+ if( ( i_stream_id >> 8 ) == PES_PRIVATE_STREAM_1 )
{
+ i_private_id = i_stream_id & 0xff;
+ i_stream_id = PES_PRIVATE_STREAM_1;
+ /* For PES_PRIVATE_STREAM_1 there is an extra header after the
+ pes header */
+ /* i_private_id != -1 because TS use 0xbd without private_id */
i_extra = 1;
if( ( i_private_id & 0xf0 ) == 0x80 )
- {
i_extra += 3;
- }
+ }
+ else if( ( i_stream_id >> 8 ) == PES_EXTENDED_STREAM_ID )
+ {
+ /* Enable support for extended_stream_id as defined in
+ * ISO/IEC 13818-1:2000/Amd.2:2003 */
+ /* NB, i_extended_stream_id is limited to 7 bits */
+ i_stream_id_extension = i_stream_id & 0x7f;
+ i_stream_id = PES_EXTENDED_STREAM_ID;
}
bits_initwrite( &bits, 50, p_hdr );
if( b_mpeg2 )
{
int i_pts_dts;
+ bool b_pes_extension_flag = false;
if( i_pts > 0 && i_dts > 0 &&
( i_pts != i_dts || ( p_fmt->i_cat == VIDEO_ES &&
- p_fmt->i_codec != VLC_FOURCC('m','p','g','v') ) ) )
+ p_fmt->i_codec != VLC_CODEC_MPGV ) ) )
{
i_pts_dts = 0x03;
if ( !i_header_size ) i_header_size = 0xa;
if ( !i_header_size ) i_header_size = 0x0;
}
- bits_write( &bits, 16, i_es_size + i_extra + 3
- + i_header_size ); // size
+ if( i_stream_id == PES_EXTENDED_STREAM_ID )
+ {
+ b_pes_extension_flag = true;
+ i_header_size += 1 + 1;
+ }
+
+ if( b_pes_extension_flag )
+ {
+ i_header_size += 1;
+ }
+
+ /* Unbounded streams are only allowed in TS (not PS) and only
+ * for some ES, eg. MPEG* Video ES or Dirac ES. */
+ if( i_es_size > PES_PAYLOAD_SIZE_MAX )
+ bits_write( &bits, 16, 0 ); // size unbounded
+ else
+ bits_write( &bits, 16, i_es_size + i_extra + 3
+ + i_header_size ); // size
bits_write( &bits, 2, 0x02 ); // mpeg2 id
bits_write( &bits, 2, 0x00 ); // pes scrambling control
bits_write( &bits, 1, 0x00 ); // pes priority
bits_write( &bits, 1, 0x00 ); // dsm trick mode flag
bits_write( &bits, 1, 0x00 ); // additional copy info flag
bits_write( &bits, 1, 0x00 ); // pes crc flag
- bits_write( &bits, 1, 0x00 ); // pes extension flags
- bits_write( &bits, 8, i_header_size ); // header size -> pts and dts
+ bits_write( &bits, 1, b_pes_extension_flag );
+ bits_write( &bits, 8, i_header_size );
/* write pts */
if( i_pts_dts & 0x02 )
bits_write( &bits, 1, 0x01 ); // marker
i_header_size -= 0x5;
}
+ if( b_pes_extension_flag )
+ {
+ bits_write( &bits, 1, 0x00 ); // PES_private_data_flag
+ bits_write( &bits, 1, 0x00 ); // pack_header_field_flag
+ bits_write( &bits, 1, 0x00 ); // program_packet_sequence_counter_flag
+ bits_write( &bits, 1, 0x00 ); // P-STD_buffer_flag
+ bits_write( &bits, 3, 0x07 ); // reserved
+ bits_write( &bits, 1, 0x01 ); // PES_extension_flag_2
+ /* skipping unsupported parts: */
+ /* PES_private_data */
+ /* pack_header */
+ /* program_packet_sequence_counter */
+ /* P-STD_buffer_flag */
+ if( i_stream_id == PES_EXTENDED_STREAM_ID )
+ {
+ /* PES_extension_2 */
+ bits_write( &bits, 1, 0x01 ); // marker
+ bits_write( &bits, 7, 0x01 ); // PES_extension_field_length
+ bits_write( &bits, 1, 0x01 ); // stream_id_extension_flag
+ bits_write( &bits, 7, i_stream_id_extension );
+ i_header_size -= 0x2;
+ }
+ i_header_size -= 0x1;
+ }
while ( i_header_size )
{
bits_write( &bits, 8, 0xff );
}
}
-int E_( EStoPES )( sout_instance_t *p_sout, block_t **pp_pes, block_t *p_es,
+/** EStoPES, encapsulate an elementary stream block into PES packet(s)
+ * each with a maximal payload size of @i_max_pes_size@.
+ *
+ * In some circumstances, unbounded PES packets are allowed:
+ * - Transport streams only (NOT programme streams)
+ * - Only some types of elementary streams (eg MPEG2 video)
+ * It is the responsibility of the caller to enforce these constraints.
+ *
+ * EStoPES will only produce an unbounded PES packet if:
+ * - ES is VIDEO_ES
+ * - i_max_pes_size > PES_PAYLOAD_SIZE_MAX
+ * - length of p_es > PES_PAYLOAD_SIZE_MAX
+ * If the last condition is not met, a single PES packet is produced
+ * which is not unbounded in length.
+ *
+ * \param i_stream_id stream id as follows:
+ * - 0x00 - 0xff : normal stream_id as per Table 2-18
+ * - 0xfd00 - 0xfd7f : stream_id_extension = low 7 bits
+ * (stream_id = PES_EXTENDED_STREAM_ID)
+ * - 0xbd00 - 0xbdff : private_id = low 8 bits
+ * (stream_id = PES_PRIVATE_STREAM)
+ * \param i_header_size length of padding data to insert into PES packet
+ * header in bytes.
+ * \param i_max_pes_size maximum length of each pes packet payload.
+ * if zero, uses default maximum.
+ * To allow unbounded PES packets in transport stream
+ * VIDEO_ES, set to INT_MAX.
+ */
+int EStoPES ( sout_instance_t *p_sout, block_t **pp_pes, block_t *p_es,
es_format_t *p_fmt, int i_stream_id,
int b_mpeg2, int b_data_alignment, int i_header_size,
int i_max_pes_size )
uint8_t *p_data;
int i_size;
- int i_private_id = -1;
-
uint8_t header[50]; // PES header + extra < 50 (more like 17)
int i_pes_payload;
int i_pes_header;
int i_pes_count = 1;
- /* HACK for private stream 1 in ps */
- if( ( i_stream_id >> 8 ) == PES_PRIVATE_STREAM_1 )
+ assert( i_max_pes_size >= 0 );
+ assert( i_header_size >= 0 );
+
+ /* NB, Only video ES may have unbounded length */
+ if( !i_max_pes_size ||
+ ( p_fmt->i_cat != VIDEO_ES && i_max_pes_size > PES_PAYLOAD_SIZE_MAX ) )
{
- i_private_id = i_stream_id & 0xff;
- i_stream_id = PES_PRIVATE_STREAM_1;
+ i_max_pes_size = PES_PAYLOAD_SIZE_MAX;
}
- if( p_fmt->i_codec == VLC_FOURCC( 'm', 'p','4', 'v' ) &&
+ if( p_fmt->i_codec == VLC_CODEC_MP4V &&
p_es->i_flags & BLOCK_FLAG_TYPE_I )
{
/* For MPEG4 video, add VOL before I-frames */
do
{
- i_pes_payload = __MIN( i_size, (i_max_pes_size ?
- i_max_pes_size : PES_PAYLOAD_SIZE_MAX) );
+ i_pes_payload = __MIN( i_size, i_max_pes_size );
i_pes_header = PESHeader( header, i_pts, i_dts, i_pes_payload,
- p_fmt, i_stream_id, i_private_id, b_mpeg2,
+ p_fmt, i_stream_id, b_mpeg2,
b_data_alignment, i_header_size );
i_dts = 0; // only first PES has a dts/pts
i_pts = 0;
p_pes->i_length = 0;
if( i_pes_payload > 0 )
{
- p_sout->p_libvlc->pf_memcpy( p_pes->p_buffer + i_pes_header,
- p_data, i_pes_payload );
+ vlc_memcpy( p_pes->p_buffer + i_pes_header, p_data,
+ i_pes_payload );
}
i_pes_count++;
}
projects / vlc / blobdiff