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gstreamer/gst/mpegpsmux/psmuxstream.c
Luis de Bethencourt 4e638096e6 mpegpsmux: refactor duplicate else branches 
Unknown case should assert if reached instead of just assuming the max buffer
size.

https://bugzilla.gnome.org/show_bug.cgi?id=736460
2014-09-23 17:55:36 +01:00

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/* MPEG-PS muxer plugin for GStreamer
* Copyright 2008 Lin YANG <oxcsnicho@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/*
* Unless otherwise indicated, Source Code is licensed under MIT license.
* See further explanation attached in License Statement (distributed in the file
* LICENSE).
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "psmuxcommon.h"
#include "psmuxstream.h"
#include "psmux.h"
static guint8 psmux_stream_pes_header_length (PsMuxStream * stream);
static void psmux_stream_write_pes_header (PsMuxStream * stream, guint8 * data);
static void psmux_stream_find_pts_dts_within (PsMuxStream * stream, guint bound,
gint64 * pts, gint64 * dts);
/**
* psmux_stream_new:
* @pid: a PID
* @stream_type: the stream type
*
* Create a new stream with type = @stream_type, assign stream id accordingly
*
* Returns: a new #PsMuxStream.
*/
PsMuxStream *
psmux_stream_new (PsMux * mux, PsMuxStreamType stream_type)
{
PsMuxStream *stream = g_slice_new0 (PsMuxStream);
PsMuxStreamIdInfo *info = &(mux->id_info);
stream->stream_type = stream_type;
stream->is_audio_stream = FALSE;
stream->is_video_stream = FALSE;
stream->stream_id = 0;
stream->max_buffer_size = 0;
switch (stream_type) {
/* MPEG AUDIO */
case PSMUX_ST_AUDIO_MPEG1:
case PSMUX_ST_AUDIO_MPEG2:
stream->max_buffer_size = 2484; /* ISO/IEC 13818 2.5.2.4 */
case PSMUX_ST_AUDIO_AAC:
if (info->id_mpga > PSMUX_STREAM_ID_MPGA_MAX)
break;
stream->stream_id = info->id_mpga++;
stream->stream_id_ext = 0;
stream->is_audio_stream = TRUE;
break;
/* MPEG VIDEO */
case PSMUX_ST_VIDEO_MPEG1:
case PSMUX_ST_VIDEO_MPEG2:
case PSMUX_ST_VIDEO_MPEG4:
case PSMUX_ST_VIDEO_H264:
if (info->id_mpgv > PSMUX_STREAM_ID_MPGV_MAX)
break;
stream->stream_id = info->id_mpgv++;
stream->stream_id_ext = 0;
stream->is_video_stream = TRUE;
break;
/* AC3 / A52 */
case PSMUX_ST_PS_AUDIO_AC3:
if (info->id_ac3 > PSMUX_STREAM_ID_AC3_MAX)
break;
stream->stream_id = PSMUX_PRIVATE_STREAM_1;
stream->stream_id_ext = info->id_ac3++;
stream->is_audio_stream = TRUE;
/* AC3 requires data alignment */
stream->pi.flags |= PSMUX_PACKET_FLAG_PES_DATA_ALIGN;
break;
/* TODO: SPU missing */
#if 0
case spu:
if (info->id_spu > PSMUX_STREAM_ID_SPU_MAX)
break;
return info->id_spu++;
#endif
/* DTS */
case PSMUX_ST_PS_AUDIO_DTS:
if (info->id_dts > PSMUX_STREAM_ID_DTS_MAX)
break;
stream->stream_id = PSMUX_PRIVATE_STREAM_1;
stream->stream_id_ext = info->id_dts++;
stream->is_audio_stream = TRUE;
break;
/* LPCM */
case PSMUX_ST_PS_AUDIO_LPCM:
if (info->id_lpcm > PSMUX_STREAM_ID_LPCM_MAX)
break;
stream->stream_id = PSMUX_PRIVATE_STREAM_1;
stream->stream_id_ext = info->id_lpcm++;
stream->is_audio_stream = TRUE;
break;
case PSMUX_ST_VIDEO_DIRAC:
if (info->id_dirac > PSMUX_STREAM_ID_DIRAC_MAX)
break;
stream->stream_id = PSMUX_EXTENDED_STREAM;
stream->stream_id_ext = info->id_dirac++;
stream->is_video_stream = TRUE;
break;
default:
g_critical ("Stream type 0x%0x not yet implemented", stream_type);
break;
}
if (stream->stream_id == 0) {
g_critical ("Number of elementary streams of type %04x exceeds maximum",
stream->stream_type);
g_slice_free (PsMuxStream, stream);
return NULL;
}
/* XXX: Are private streams also using stream_id_ext? */
if (stream->stream_id == PSMUX_EXTENDED_STREAM)
stream->pi.flags |= PSMUX_PACKET_FLAG_PES_EXT_STREAMID;
/* Are these useful at all? */
if (stream->stream_id == PSMUX_PROGRAM_STREAM_MAP ||
stream->stream_id == PSMUX_PADDING_STREAM ||
stream->stream_id == PSMUX_PRIVATE_STREAM_2 ||
stream->stream_id == PSMUX_ECM ||
stream->stream_id == PSMUX_EMM ||
stream->stream_id == PSMUX_PROGRAM_STREAM_DIRECTORY ||
stream->stream_id == PSMUX_DSMCC_STREAM ||
stream->stream_id == PSMUX_ITU_T_H222_1_TYPE_E)
stream->pi.flags &= ~PSMUX_PACKET_FLAG_PES_FULL_HEADER;
else
stream->pi.flags |= PSMUX_PACKET_FLAG_PES_FULL_HEADER;
stream->buffers = NULL;
stream->bytes_avail = 0;
stream->cur_buffer = NULL;
stream->cur_buffer_consumed = 0;
stream->cur_pes_payload_size = 0;
stream->pts = -1;
stream->dts = -1;
stream->last_pts = -1;
/* These fields are set by gstreamer */
stream->audio_sampling = 0;
stream->audio_channels = 0;
stream->audio_bitrate = 0;
if (stream->max_buffer_size == 0) {
/* XXX: VLC'S VALUE. Better default? */
if (stream->is_video_stream)
stream->max_buffer_size = 400 * 1024;
else if (stream->is_audio_stream)
stream->max_buffer_size = 4 * 1024;
else
g_assert_not_reached ();
}
return stream;
}
/**
* psmux_stream_free:
* @stream: a #PsMuxStream
*
* Free the resources of @stream.
*/
void
psmux_stream_free (PsMuxStream * stream)
{
g_return_if_fail (stream != NULL);
if (psmux_stream_bytes_in_buffer (stream)) {
g_warning ("Freeing stream with data not yet processed");
}
g_slice_free (PsMuxStream, stream);
}
/* Advance the current packet stream position by len bytes.
* Mustn't consume more than available in the current packet */
static void
psmux_stream_consume (PsMuxStream * stream, guint len)
{
g_assert (stream->cur_buffer != NULL);
g_assert (len <= stream->cur_buffer->map.size - stream->cur_buffer_consumed);
stream->cur_buffer_consumed += len;
stream->bytes_avail -= len;
if (stream->cur_buffer_consumed == 0)
return;
if (stream->cur_buffer->pts != -1)
stream->last_pts = stream->cur_buffer->pts;
if (stream->cur_buffer_consumed == stream->cur_buffer->map.size) {
/* Current packet is completed, move along */
stream->buffers = g_list_delete_link (stream->buffers, stream->buffers);
gst_buffer_unmap (stream->cur_buffer->buf, &stream->cur_buffer->map);
gst_buffer_unref (stream->cur_buffer->buf);
g_slice_free (PsMuxStreamBuffer, stream->cur_buffer);
stream->cur_buffer = NULL;
}
}
/**
* psmux_stream_bytes_in_buffer:
* @stream: a #PsMuxStream
*
* Calculate how much bytes are in the buffer.
*
* Returns: The number of bytes in the buffer.
*/
gint
psmux_stream_bytes_in_buffer (PsMuxStream * stream)
{
g_return_val_if_fail (stream != NULL, 0);
return stream->bytes_avail;
}
/**
* psmux_stream_get_data:
* @stream: a #PsMuxStream
* @buf: a buffer to hold the result
* @len: the length of @buf
*
* Write a PES packet to @buf, up to @len bytes
*
* Returns: number of bytes having been written, 0 if error
*/
guint
psmux_stream_get_data (PsMuxStream * stream, guint8 * buf, guint len)
{
guint8 pes_hdr_length;
guint w;
g_return_val_if_fail (stream != NULL, FALSE);
g_return_val_if_fail (buf != NULL, FALSE);
g_return_val_if_fail (len >= PSMUX_PES_MAX_HDR_LEN, FALSE);
stream->cur_pes_payload_size =
MIN (psmux_stream_bytes_in_buffer (stream), len - PSMUX_PES_MAX_HDR_LEN);
/* Note that we cannot make a better estimation of the header length for the
* time being; because the header length is dependent on whether we can find a
* timestamp in the upcomming buffers, which in turn depends on
* cur_pes_payload_size, which is exactly what we want to decide.
*/
psmux_stream_find_pts_dts_within (stream, stream->cur_pes_payload_size,
&stream->pts, &stream->dts);
/* clear pts/dts flag */
stream->pi.flags &= ~(PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS |
PSMUX_PACKET_FLAG_PES_WRITE_PTS);
/* update pts/dts flag */
if (stream->pts != -1 && stream->dts != -1)
stream->pi.flags |= PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS;
else {
if (stream->pts != -1)
stream->pi.flags |= PSMUX_PACKET_FLAG_PES_WRITE_PTS;
}
pes_hdr_length = psmux_stream_pes_header_length (stream);
/* write pes header */
GST_LOG ("Writing PES header of length %u and payload %d",
pes_hdr_length, stream->cur_pes_payload_size);
psmux_stream_write_pes_header (stream, buf);
buf += pes_hdr_length;
w = stream->cur_pes_payload_size; /* number of bytes of payload to write */
while (w > 0) {
guint32 avail;
guint8 *cur;
if (stream->cur_buffer == NULL) {
/* Start next packet */
if (stream->buffers == NULL)
return FALSE;
stream->cur_buffer = (PsMuxStreamBuffer *) (stream->buffers->data);
stream->cur_buffer_consumed = 0;
}
/* Take as much as we can from the current buffer */
avail = stream->cur_buffer->map.size - stream->cur_buffer_consumed;
cur = stream->cur_buffer->map.data + stream->cur_buffer_consumed;
if (avail < w) {
memcpy (buf, cur, avail);
psmux_stream_consume (stream, avail);
buf += avail;
w -= avail;
} else {
memcpy (buf, cur, w);
psmux_stream_consume (stream, w);
w = 0;
}
}
return pes_hdr_length + stream->cur_pes_payload_size;
}
static guint8
psmux_stream_pes_header_length (PsMuxStream * stream)
{
guint8 packet_len;
/* Calculate the length of the header for this stream */
/* start_code prefix + stream_id + pes_packet_length = 6 bytes */
packet_len = 6;
if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_FULL_HEADER) {
/* For a PES 'full header' we have at least 3 more bytes,
* and then more based on flags */
packet_len += 3;
if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS) {
packet_len += 10;
} else if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS) {
packet_len += 5;
}
if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_EXT_STREAMID) {
/* Need basic extension flags (1 byte), plus 2 more bytes for the
* length + extended stream id */
packet_len += 3;
}
}
return packet_len;
}
/* Find a PTS/DTS to write into the pes header within the next bound bytes
* of the data */
static void
psmux_stream_find_pts_dts_within (PsMuxStream * stream, guint bound,
gint64 * pts, gint64 * dts)
{
/* 1. When there are at least one buffer then output the first buffer with
* pts/dts
* 2. If the bound is too small to include even one buffer, output the pts/dts
* of that buffer.
*/
GList *cur;
*pts = -1;
*dts = -1;
for (cur = g_list_first (stream->buffers); cur != NULL;
cur = g_list_next (cur)) {
PsMuxStreamBuffer *curbuf = cur->data;
/* FIXME: This isn't quite correct - if the 'bound' is within this
* buffer, we don't know if the timestamp is before or after the split
* so we shouldn't return it */
if (bound <= curbuf->map.size) {
*pts = curbuf->pts;
*dts = curbuf->dts;
return;
}
/* Have we found a buffer with pts/dts set? */
if (curbuf->pts != -1 || curbuf->dts != -1) {
*pts = curbuf->pts;
*dts = curbuf->dts;
return;
}
bound -= curbuf->map.size;
}
}
static void
psmux_stream_write_pes_header (PsMuxStream * stream, guint8 * data)
{
guint16 length_to_write;
guint8 hdr_len = psmux_stream_pes_header_length (stream);
/* start_code prefix + stream_id + pes_packet_length = 6 bytes */
data[0] = 0x00;
data[1] = 0x00;
data[2] = 0x01;
data[3] = stream->stream_id;
data += 4;
length_to_write = hdr_len - 6 + stream->cur_pes_payload_size;
psmux_put16 (&data, length_to_write);
if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_FULL_HEADER) {
guint8 flags = 0;
/* Not scrambled, original, not-copyrighted, data_alignment specified by flag */
flags = 0x81;
if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_DATA_ALIGN)
flags |= 0x04; /* Enable data_alignment_indicator */
*data++ = flags;
/* Flags */
flags = 0;
if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS)
flags |= 0xC0;
else if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS)
flags |= 0x80;
if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_EXT_STREAMID)
flags |= 0x01; /* Enable PES_extension_flag */
*data++ = flags;
/* Header length is the total pes length,
* minus the 9 bytes of start codes, flags + hdr_len */
g_return_if_fail (hdr_len >= 9);
*data++ = (hdr_len - 9);
if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS) {
psmux_put_ts (&data, 0x3, stream->pts);
psmux_put_ts (&data, 0x1, stream->dts);
} else if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_WRITE_PTS) {
psmux_put_ts (&data, 0x2, stream->pts);
}
if (stream->pi.flags & PSMUX_PACKET_FLAG_PES_EXT_STREAMID) {
guint8 ext_len;
flags = 0x0f; /* preceeding flags all 0 | (reserved bits) | PES_extension_flag_2 */
*data++ = flags;
ext_len = 1; /* Only writing 1 byte into the extended fields */
*data++ = 0x80 | ext_len; /* marker | PES_extension_field_length */
*data++ = 0x80 | stream->stream_id_ext; /* stream_id_extension_flag | extended_stream_id */
}
}
}
/**
* psmux_stream_add_data:
* @stream: a #PsMuxStream
* @buffer: (transfer full): buffer with data to add
* @pts: PTS of access unit in @data
* @dts: DTS of access unit in @data
*
* Submit @len bytes of @data into @stream. @pts and @dts can be set to the
* timestamp (against a 90Hz clock) of the first access unit in @data. A
* timestamp of -1 for @pts or @dts means unknown.
*
* This function takes ownership of @buffer.
*/
void
psmux_stream_add_data (PsMuxStream * stream, GstBuffer * buffer,
gint64 pts, gint64 dts, gboolean keyunit)
{
PsMuxStreamBuffer *packet;
g_return_if_fail (stream != NULL);
packet = g_slice_new (PsMuxStreamBuffer);
packet->buf = buffer;
if (!gst_buffer_map (packet->buf, &packet->map, GST_MAP_READ)) {
GST_ERROR ("Failed to map buffer for reading");
gst_buffer_unref (packet->buf);
g_slice_free (PsMuxStreamBuffer, packet);
return;
}
packet->keyunit = keyunit;
packet->pts = pts;
packet->dts = dts;
if (stream->bytes_avail == 0)
stream->last_pts = pts;
stream->bytes_avail += packet->map.size;
/* FIXME: perhaps use GstQueueArray instead? */
stream->buffers = g_list_append (stream->buffers, packet);
}
/**
* psmux_stream_get_es_descrs:
* @stream: a #PsMuxStream
* @buf: a buffer to hold the ES descriptor
* @len: the length used in @buf
*
* Write an Elementary Stream Descriptor for @stream into @buf. the number of
* bytes consumed in @buf will be updated in @len.
*
* @buf and @len must be at least #PSMUX_MIN_ES_DESC_LEN.
*/
void
psmux_stream_get_es_descrs (PsMuxStream * stream, guint8 * buf, guint16 * len)
{
guint8 *pos;
g_return_if_fail (stream != NULL);
if (buf == NULL) {
if (len != NULL)
*len = 0;
return;
}
/* Based on the stream type, write out any descriptors to go in the
* PMT ES_info field */
pos = buf;
/* tag (registration_descriptor), length, format_identifier */
switch (stream->stream_type) {
case PSMUX_ST_AUDIO_AAC:
/* FIXME */
break;
case PSMUX_ST_VIDEO_MPEG4:
/* FIXME */
break;
case PSMUX_ST_VIDEO_H264:
*pos++ = 0x05;
*pos++ = 8;
*pos++ = 0x48; /* 'H' */
*pos++ = 0x44; /* 'D' */
*pos++ = 0x4D; /* 'M' */
*pos++ = 0x56; /* 'V' */
/* FIXME : Not sure about this additional_identification_info */
*pos++ = 0xFF;
*pos++ = 0x1B;
*pos++ = 0x44;
*pos++ = 0x3F;
break;
case PSMUX_ST_VIDEO_DIRAC:
*pos++ = 0x05;
*pos++ = 4;
*pos++ = 0x64; /* 'd' */
*pos++ = 0x72; /* 'r' */
*pos++ = 0x61; /* 'a' */
*pos++ = 0x63; /* 'c' */
break;
case PSMUX_ST_PS_AUDIO_AC3:
{
*pos++ = 0x05;
*pos++ = 4;
*pos++ = 0x41; /* 'A' */
*pos++ = 0x43; /* 'C' */
*pos++ = 0x2D; /* '-' */
*pos++ = 0x33; /* '3' */
/* audio_stream_descriptor () | ATSC A/52-2001 Annex A
*
* descriptor_tag 8 uimsbf
* descriptor_length 8 uimsbf
* sample_rate_code 3 bslbf
* bsid 5 bslbf
* bit_rate_code 6 bslbf
* surround_mode 2 bslbf
* bsmod 3 bslbf
* num_channels 4 bslbf
* full_svc 1 bslbf
* langcod 8 bslbf
* [...]
*/
*pos++ = 0x81;
*pos++ = 0x04;
/* 3 bits sample_rate_code, 5 bits hardcoded bsid (default ver 8) */
switch (stream->audio_sampling) {
case 48000:
*pos++ = 0x08;
break;
case 44100:
*pos++ = 0x28;
break;
case 32000:
*pos++ = 0x48;
break;
default:
*pos++ = 0xE8;
break; /* 48, 44.1 or 32 Khz */
}
/* 1 bit bit_rate_limit, 5 bits bit_rate_code, 2 bits suround_mode */
switch (stream->audio_bitrate) {
case 32:
*pos++ = 0x00 << 2;
break;
case 40:
*pos++ = 0x01 << 2;
break;
case 48:
*pos++ = 0x02 << 2;
break;
case 56:
*pos++ = 0x03 << 2;
break;
case 64:
*pos++ = 0x04 << 2;
break;
case 80:
*pos++ = 0x05 << 2;
break;
case 96:
*pos++ = 0x06 << 2;
break;
case 112:
*pos++ = 0x07 << 2;
break;
case 128:
*pos++ = 0x08 << 2;
break;
case 160:
*pos++ = 0x09 << 2;
break;
case 192:
*pos++ = 0x0A << 2;
break;
case 224:
*pos++ = 0x0B << 2;
break;
case 256:
*pos++ = 0x0C << 2;
break;
case 320:
*pos++ = 0x0D << 2;
break;
case 384:
*pos++ = 0x0E << 2;
break;
case 448:
*pos++ = 0x0F << 2;
break;
case 512:
*pos++ = 0x10 << 2;
break;
case 576:
*pos++ = 0x11 << 2;
break;
case 640:
*pos++ = 0x12 << 2;
break;
default:
*pos++ = 0x32 << 2;
break; /* 640 Kb/s upper limit */
}
/* 3 bits bsmod, 4 bits num_channels, 1 bit full_svc */
switch (stream->audio_channels) {
case 1:
*pos++ = 0x01 << 1;
break; /* 1/0 */
case 2:
*pos++ = 0x02 << 1;
break; /* 2/0 */
case 3:
*pos++ = 0x0A << 1;
break; /* <= 3 */
case 4:
*pos++ = 0x0B << 1;
break; /* <= 4 */
case 5:
*pos++ = 0x0C << 1;
break; /* <= 5 */
case 6:
default:
*pos++ = 0x0D << 1;
break; /* <= 6 */
}
*pos++ = 0x00;
break;
}
case PSMUX_ST_PS_AUDIO_DTS:
/* FIXME */
break;
case PSMUX_ST_PS_AUDIO_LPCM:
/* FIXME */
break;
default:
break;
}
if (len)
*len = (pos - buf);
}
/**
* psmux_stream_get_pts:
* @stream: a #PsMuxStream
*
* Return the PTS of the last buffer that has had bytes written and
* which _had_ a PTS in @stream.
*
* Returns: the PTS of the last buffer in @stream.
*/
guint64
psmux_stream_get_pts (PsMuxStream * stream)
{
g_return_val_if_fail (stream != NULL, -1);
return stream->last_pts;
}
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