Beispiel #1
0
GstIsoffParserResult
gst_isoff_sidx_parser_parse (GstSidxParser * parser,
    GstByteReader * reader, guint * consumed)
{
  GstIsoffParserResult res = GST_ISOFF_PARSER_OK;
  gsize remaining;

  switch (parser->status) {
    case GST_ISOFF_SIDX_PARSER_INIT:
      /* Try again once we have enough data for the FullBox header */
      if (gst_byte_reader_get_remaining (reader) < 4) {
        gst_byte_reader_set_pos (reader, 0);
        break;
      }
      parser->sidx.version = gst_byte_reader_get_uint8_unchecked (reader);
      parser->sidx.flags = gst_byte_reader_get_uint24_le_unchecked (reader);

      parser->status = GST_ISOFF_SIDX_PARSER_HEADER;

    case GST_ISOFF_SIDX_PARSER_HEADER:
      remaining = gst_byte_reader_get_remaining (reader);
      if (remaining < 12 + (parser->sidx.version == 0 ? 8 : 16)) {
        break;
      }

      parser->sidx.ref_id = gst_byte_reader_get_uint32_be_unchecked (reader);
      parser->sidx.timescale = gst_byte_reader_get_uint32_be_unchecked (reader);
      if (parser->sidx.version == 0) {
        parser->sidx.earliest_pts =
            gst_byte_reader_get_uint32_be_unchecked (reader);
        parser->sidx.first_offset =
            gst_byte_reader_get_uint32_be_unchecked (reader);
      } else {
        parser->sidx.earliest_pts =
            gst_byte_reader_get_uint64_be_unchecked (reader);
        parser->sidx.first_offset =
            gst_byte_reader_get_uint64_be_unchecked (reader);
      }
      /* skip 2 reserved bytes */
      gst_byte_reader_skip_unchecked (reader, 2);
      parser->sidx.entries_count =
          gst_byte_reader_get_uint16_be_unchecked (reader);

      GST_LOG ("Timescale: %" G_GUINT32_FORMAT, parser->sidx.timescale);
      GST_LOG ("Earliest pts: %" G_GUINT64_FORMAT, parser->sidx.earliest_pts);
      GST_LOG ("First offset: %" G_GUINT64_FORMAT, parser->sidx.first_offset);

      parser->cumulative_pts =
          gst_util_uint64_scale_int_round (parser->sidx.earliest_pts,
          GST_SECOND, parser->sidx.timescale);

      if (parser->sidx.entries_count) {
        parser->sidx.entries =
            g_malloc (sizeof (GstSidxBoxEntry) * parser->sidx.entries_count);
      }
      parser->sidx.entry_index = 0;

      parser->status = GST_ISOFF_SIDX_PARSER_DATA;

    case GST_ISOFF_SIDX_PARSER_DATA:
      while (parser->sidx.entry_index < parser->sidx.entries_count) {
        GstSidxBoxEntry *entry =
            &parser->sidx.entries[parser->sidx.entry_index];

        remaining = gst_byte_reader_get_remaining (reader);
        if (remaining < 12)
          break;

        entry->offset = parser->cumulative_entry_size;
        entry->pts = parser->cumulative_pts;
        gst_isoff_parse_sidx_entry (entry, reader);
        entry->duration = gst_util_uint64_scale_int_round (entry->duration,
            GST_SECOND, parser->sidx.timescale);
        parser->cumulative_entry_size += entry->size;
        parser->cumulative_pts += entry->duration;

        GST_LOG ("Sidx entry %d) offset: %" G_GUINT64_FORMAT ", pts: %"
            GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT " - size %"
            G_GUINT32_FORMAT, parser->sidx.entry_index, entry->offset,
            GST_TIME_ARGS (entry->pts), GST_TIME_ARGS (entry->duration),
            entry->size);

        parser->sidx.entry_index++;
      }

      if (parser->sidx.entry_index == parser->sidx.entries_count)
        parser->status = GST_ISOFF_SIDX_PARSER_FINISHED;
      else
        break;
    case GST_ISOFF_SIDX_PARSER_FINISHED:
      parser->sidx.entry_index = 0;
      res = GST_ISOFF_PARSER_DONE;
      break;
  }

  *consumed = gst_byte_reader_get_pos (reader);

  return res;
}
Beispiel #2
0
GstIsoffParserResult
gst_isoff_sidx_parser_add_buffer (GstSidxParser * parser, GstBuffer * buffer,
    guint * consumed)
{
  GstIsoffParserResult res = GST_ISOFF_PARSER_OK;
  GstByteReader reader;
  GstMapInfo info;
  gsize remaining;
  guint32 fourcc;

  if (!gst_buffer_map (buffer, &info, GST_MAP_READ)) {
    *consumed = 0;
    return GST_ISOFF_PARSER_ERROR;
  }

  gst_byte_reader_init (&reader, info.data, info.size);

  switch (parser->status) {
    case GST_ISOFF_SIDX_PARSER_INIT:
      if (gst_byte_reader_get_remaining (&reader) < GST_ISOFF_FULL_BOX_SIZE) {
        break;
      }

      parser->size = gst_byte_reader_get_uint32_be_unchecked (&reader);
      fourcc = gst_byte_reader_get_uint32_le_unchecked (&reader);
      if (fourcc != GST_ISOFF_FOURCC_SIDX) {
        res = GST_ISOFF_PARSER_UNEXPECTED;
        gst_byte_reader_set_pos (&reader, 0);
        break;
      }
      if (parser->size == 1) {
        if (gst_byte_reader_get_remaining (&reader) < 12) {
          gst_byte_reader_set_pos (&reader, 0);
          break;
        }

        parser->size = gst_byte_reader_get_uint64_be_unchecked (&reader);
      }
      if (parser->size == 0) {
        res = GST_ISOFF_PARSER_ERROR;
        gst_byte_reader_set_pos (&reader, 0);
        break;
      }
      parser->sidx.version = gst_byte_reader_get_uint8_unchecked (&reader);
      parser->sidx.flags = gst_byte_reader_get_uint24_le_unchecked (&reader);

      parser->status = GST_ISOFF_SIDX_PARSER_HEADER;

    case GST_ISOFF_SIDX_PARSER_HEADER:
      remaining = gst_byte_reader_get_remaining (&reader);
      if (remaining < 12 + (parser->sidx.version == 0 ? 8 : 16)) {
        break;
      }

      parser->sidx.ref_id = gst_byte_reader_get_uint32_be_unchecked (&reader);
      parser->sidx.timescale =
          gst_byte_reader_get_uint32_be_unchecked (&reader);
      if (parser->sidx.version == 0) {
        parser->sidx.earliest_pts =
            gst_byte_reader_get_uint32_be_unchecked (&reader);
        parser->sidx.first_offset = parser->sidx.earliest_pts =
            gst_byte_reader_get_uint32_be_unchecked (&reader);
      } else {
        parser->sidx.earliest_pts =
            gst_byte_reader_get_uint64_be_unchecked (&reader);
        parser->sidx.first_offset =
            gst_byte_reader_get_uint64_be_unchecked (&reader);
      }
      /* skip 2 reserved bytes */
      gst_byte_reader_skip_unchecked (&reader, 2);
      parser->sidx.entries_count =
          gst_byte_reader_get_uint16_be_unchecked (&reader);

      GST_LOG ("Timescale: %" G_GUINT32_FORMAT, parser->sidx.timescale);
      GST_LOG ("Earliest pts: %" G_GUINT64_FORMAT, parser->sidx.earliest_pts);
      GST_LOG ("First offset: %" G_GUINT64_FORMAT, parser->sidx.first_offset);

      parser->cumulative_pts =
          gst_util_uint64_scale_int_round (parser->sidx.earliest_pts,
          GST_SECOND, parser->sidx.timescale);

      if (parser->sidx.entries_count) {
        parser->sidx.entries =
            g_malloc (sizeof (GstSidxBoxEntry) * parser->sidx.entries_count);
      }
      parser->sidx.entry_index = 0;

      parser->status = GST_ISOFF_SIDX_PARSER_DATA;

    case GST_ISOFF_SIDX_PARSER_DATA:
      while (parser->sidx.entry_index < parser->sidx.entries_count) {
        GstSidxBoxEntry *entry =
            &parser->sidx.entries[parser->sidx.entry_index];

        remaining = gst_byte_reader_get_remaining (&reader);;
        if (remaining < 12)
          break;

        entry->offset = parser->cumulative_entry_size;
        entry->pts = parser->cumulative_pts;
        gst_isoff_parse_sidx_entry (entry, &reader);
        entry->duration = gst_util_uint64_scale_int_round (entry->duration,
            GST_SECOND, parser->sidx.timescale);
        parser->cumulative_entry_size += entry->size;
        parser->cumulative_pts += entry->duration;

        GST_LOG ("Sidx entry %d) offset: %" G_GUINT64_FORMAT ", pts: %"
            GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT " - size %"
            G_GUINT32_FORMAT, parser->sidx.entry_index, entry->offset,
            GST_TIME_ARGS (entry->pts), GST_TIME_ARGS (entry->duration),
            entry->size);

        parser->sidx.entry_index++;
      }

      if (parser->sidx.entry_index == parser->sidx.entries_count)
        parser->status = GST_ISOFF_SIDX_PARSER_FINISHED;
      else
        break;
    case GST_ISOFF_SIDX_PARSER_FINISHED:
      parser->sidx.entry_index = 0;
      res = GST_ISOFF_PARSER_DONE;
      break;
  }

  *consumed = gst_byte_reader_get_pos (&reader);
  gst_buffer_unmap (buffer, &info);
  return res;
}