/* MPEG-PS muxer plugin for GStreamer * Copyright 2008 Lin YANG * * 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 #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 /* Unknown */ stream->max_buffer_size = 4 * 1024; } 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; }